/* ============================================
   IXIT × QSAN Korea
   Based on QSAN Visual Identity Guidelines v10 (Jan 2025)
   ============================================

   ┌─────────────────────────────────────────────────────┐
   │  QSAN OFFICIAL BRAND COLORS (VI Guideline v10)      │
   ├─────────────────────────────────────────────────────┤
   │  PRIMARY                                            │
   │  QSAN Green   : #5EC400  Pantone 375 C              │
   │                 C:54 M:0 Y:100 K:0 / R:94 G:196 B:0 │
   │  QSAN Black   : #231F20  Near-black for logo/type   │
   │                 C:0 M:0 Y:0 K:100 (rich black)      │
   │  QSAN White   : #FFFFFF                             │
   ├─────────────────────────────────────────────────────┤
   │  SUPPORTING GRAY SCALE                              │
   │  Gray 1       : #3D3D3D  (darkest — 75% black)      │
   │  Gray 2       : #6D6E70  (dark — 55% black)         │
   │  Gray 3       : #A7A9AC  (mid — 35% black)          │
   │  Gray 4       : #D1D3D4  (light — 20% black)        │
   │  Gray 5       : #F1F1F2  (lightest — 5% black)      │
   ├─────────────────────────────────────────────────────┤
   │  TYPOGRAPHY (VI Guideline)                          │
   │  Barlow       : 300/400/500/600/700/800/900         │
   │  Korean       : Noto Sans KR 300–800                │
   │  Heading H1   : Barlow 800, letter-spacing: -0.03em │
   │  Heading H2   : Barlow 700, letter-spacing: -0.025em│
   │  Heading H3   : Barlow 600                          │
   │  Body         : Barlow/Noto Sans KR 400             │
   │  Caption/Tag  : Barlow 700, uppercase, ls: 0.1em    │
   ├─────────────────────────────────────────────────────┤
   │  BOX LOGO LOCKUP (VI Guideline)                     │
   │  Box BG       : QSAN Green #5EC400                  │
   │  Text         : White #FFFFFF, Barlow 900 ExtraBold │
   │  Clear Space  : X = box height / 4                  │
   │  Minimum size : 25px box height (digital)           │
   ├─────────────────────────────────────────────────────┤
   │  SITE BACKGROUND (dark mode for product imagery)    │
   │  Page BG      : #0B0B0B                             │
   │  Surface 1    : #111111                             │
   │  Surface 2    : #161616  (card)                     │
   │  Surface 3    : #1E1E1E  (elevated)                 │
   │  Surface 4    : #242424  (overlay)                  │
   └─────────────────────────────────────────────────────┘
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@300;400;500;600;700;800;900&family=Noto+Sans+KR:wght@300;400;500;600;700;800&display=swap');

/* === CSS Design Tokens === */
:root {
  /* ── QSAN Official Brand Colors ── */
  --qsan-green:      #5EC400;   /* QSAN Primary Green (Pantone 375 C) */
  --qsan-green-light:#72D900;   /* Lighter tint for hover */
  --qsan-green-dark: #4AA000;   /* Darker for pressed */
  --qsan-green-glow: rgba(94, 196, 0, 0.22);
  --qsan-green-tint: rgba(94, 196, 0, 0.10);
  --qsan-black:      #231F20;   /* QSAN official black */

  /* ── Supporting Gray Scale (VI Guideline) ── */
  --gray-1:  #3D3D3D;
  --gray-2:  #6D6E70;
  --gray-3:  #A7A9AC;
  --gray-4:  #D1D3D4;
  --gray-5:  #F1F1F2;

  /* ── Site Dark Background ── */
  --bg-base:     #0B0B0B;
  --bg-level-1:  #111111;
  --bg-level-2:  #161616;
  --bg-level-3:  #1E1E1E;
  --bg-level-4:  #242424;

  /* ── Text ── */
  --text-primary:   #FFFFFF;
  --text-secondary: #B0B0B0;
  --text-muted:     #6D6E70;
  --text-disabled:  #3D3D3D;

  /* ── Borders ── */
  --border:        #2A2A2A;
  --border-mid:    #333333;
  --border-green:  rgba(94, 196, 0, 0.28);

  /* ── State Colors ── */
  --success:      #5EC400;
  --warning:      #F59E0B;
  --error:        #EF4444;

  /* ── Aliases (backward compat) ── */
  --green:        var(--qsan-green);
  --green-bright: var(--qsan-green-light);
  --green-neon:   #8FE000;
  --green-dark:   var(--qsan-green-dark);
  --green-glow:   var(--qsan-green-glow);
  --green-glow-sm:var(--qsan-green-tint);

  /* ── Legacy site aliases ── */
  --bg-primary:   var(--bg-base);
  --bg-secondary: var(--bg-level-1);
  --bg-card:      var(--bg-level-2);
  --bg-white:     var(--bg-level-1);
  --bg-section:   var(--bg-level-1);
  --bg-dark:      var(--bg-base);
  --bg-dark-2:    #080808;
  --border-light: #1E1E1E;

  /* ── Typography (QSAN VI: Barlow + Noto Sans KR) ── */
  --font-primary: 'Barlow', 'Noto Sans KR', 'Arial', sans-serif;
  --font-display: 'Barlow', 'Arial Black', sans-serif;

  /* ── Layout ── */
  --max-width:    1440px;
  --container-px: clamp(1rem, 5vw, 4rem);
  --section-py:   clamp(4rem, 8vw, 7rem);

  /* ── Radius ── */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;
  --radius-xl:   20px;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.5);
  --shadow-md:      0 4px 16px rgba(0,0,0,0.55), 0 2px 6px rgba(0,0,0,0.35);
  --shadow-lg:      0 8px 32px rgba(0,0,0,0.65), 0 4px 12px rgba(0,0,0,0.45);
  --shadow-xl:      0 20px 60px rgba(0,0,0,0.75);
  --shadow-green:   0 6px 28px rgba(94, 196, 0, 0.22);
  --shadow-green-lg:0 14px 44px rgba(94, 196, 0, 0.28);

  /* ── Transitions ── */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-primary);
  color: var(--text-primary);
  background: var(--bg-base);
  line-height: 1.65;
  overflow-x: hidden;
  font-weight: 400;
  letter-spacing: -0.005em;
  /* VI Guideline: crisp font rendering */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img   { max-width: 100%; height: auto; display: block; }
a     { color: inherit; text-decoration: none; }
button{ cursor: pointer; border: none; background: none; font-family: inherit; }
ul    { list-style: none; }
input, textarea, select { font-family: inherit; }

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ── Section Helpers ── */
.section-header { text-align: center; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-header.text-left { text-align: left; }

/* VI Guideline: Caption style — uppercase Barlow 700, ls 0.1em */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--qsan-green-tint);
  color: var(--qsan-green);
  font-family: var(--font-primary);
  font-size: 0.6875rem;    /* VI caption size */
  font-weight: 700;
  letter-spacing: 0.12em;  /* VI: uppercase labels get generous tracking */
  text-transform: uppercase;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(94, 196, 0, 0.28);
  margin-bottom: 1rem;
}

/* VI Guideline: H2 — Barlow 700, ls -0.025em */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 3.5vw, 2.75rem);
  font-weight: 700;         /* VI H2 = 700 */
  line-height: 1.12;
  color: var(--text-primary);
  letter-spacing: -0.025em; /* VI H2 tracking */
  margin-bottom: 1rem;
}

/* VI Guideline: Body text — 400 weight, 1.75 line-height */
.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 640px;
  margin: 0 auto;
  font-weight: 400;
}

.section-header.text-left .section-desc { margin: 0; }
.text-accent { color: var(--qsan-green); }

/* ============================================
   TYPOGRAPHY HIERARCHY — VI Guideline v10
   Barlow weights: 300 Light / 400 Regular /
   500 Medium / 600 SemiBold / 700 Bold /
   800 ExtraBold / 900 Black
   ============================================ */

/* VI Display — Large headlines (Barlow 800) */
.vi-display-1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

/* VI H1 — Section heroes (Barlow 800) */
.vi-h1 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

/* VI H2 — Section titles (Barlow 700) */
.vi-h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

/* VI H3 — Card titles (Barlow 600) */
.vi-h3 {
  font-family: var(--font-primary);
  font-size: clamp(1.1rem, 1.8vw, 1.375rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
}

/* VI Body — Regular text */
.vi-body-lg { font-size: 1.0625rem; font-weight: 400; line-height: 1.75; }
.vi-body    { font-size: 0.9375rem; font-weight: 400; line-height: 1.7; }
.vi-body-sm { font-size: 0.875rem;  font-weight: 400; line-height: 1.65; }

/* VI Caption — Labels / tags (uppercase Barlow 700) */
.vi-caption {
  font-family: var(--font-primary);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* VI Number — Data/stats (Barlow 800) */
.vi-number {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

/* ============================================
   QSAN LOGO SYSTEM
   Based on VI Guideline: Box Logo Lockup
   ─ Box: QSAN Green (#5EC400) background
   ─ Text "QSAN": White (#FFFFFF), Barlow 900
   ─ Clear space: equal to box height / 4
   ─ Min digital size: 25px box height
   ─ Partner lockup: divider + company name
   ============================================ */

/* Nav Logo Wrapper */
.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  gap: 0;
}

.nav-logo-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* QSAN Box Logo — VI Guideline "Box Logo" */
.qsan-badge-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.05em;
  background: var(--qsan-green);
  padding: 0.28em 0.6em 0.28em 0.55em;
  border-radius: 5px;
  line-height: 1;
  flex-shrink: 0;
  position: relative;
  transition: filter var(--transition-fast);
}

.nav-logo:hover .qsan-badge-logo {
  filter: brightness(1.08);
}

/* QSAN Logo — transparent PNG (background removed) so it blends
   naturally into whatever surface it sits on (dark nav / footer) */
.qsan-logo-img {
  height: 39px;      /* 26px × 1.5 (150% up) */
  width: auto;
  display: block;
  flex-shrink: 0;
  transition: filter var(--transition-fast), opacity var(--transition-fast);
}

.nav-logo:hover .qsan-logo-img {
  filter: brightness(1.15);
}

.qsan-logo-img-lg {
  height: 34px;
  margin-bottom: 1.25rem;
}

/* QSAN wordmark text inside green box */
.qsan-badge-text {
  font-family: 'Barlow', 'Arial Black', Arial, sans-serif;
  font-size: 1.35rem;
  font-weight: 900;
  color: #FFFFFF;
  letter-spacing: 0.06em;
  line-height: 1;
}

/* ® registered mark */
.qsan-badge-reg {
  font-family: 'Barlow', Arial, sans-serif;
  font-size: 0.45rem;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  vertical-align: super;
  line-height: 1;
  margin-left: 0.05em;
}

/* Partner label beside the box logo */
.nav-logo-meta {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  line-height: 1.25;
  border-left: 1px solid var(--border-mid);
  padding-left: 1rem;
}

.nav-logo-company {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-logo-sub {
  font-size: 0.575rem;
  font-weight: 600;
  color: var(--qsan-green);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Footer large logo */
.qsan-badge-lg {
  padding: 0.4em 0.85em 0.4em 0.75em;
  border-radius: 7px;
  margin-bottom: 1.25rem;
}

.qsan-badge-lg .qsan-badge-text { font-size: 1.75rem; }
.qsan-badge-lg .qsan-badge-reg  { font-size: 0.55rem; }

/* ── VI Guideline: Logo background usage rules ──
   • On dark BG  : QSAN Green box (#5EC400) + white text ✓ (current)
   • On green BG : White box + green text (invert)
   • On white BG : QSAN Green box + white text ✓ (standard)
   • Clear space = logo box height ÷ 4 (minimum on all sides)
   ─────────────────────────────────────────────────── */

/* Logo on green/colored background — inverted version */
.qsan-badge-logo.logo-invert {
  background: #FFFFFF;
}
.qsan-badge-logo.logo-invert .qsan-badge-text {
  color: var(--qsan-green);
}
.qsan-badge-logo.logo-invert .qsan-badge-reg {
  color: rgba(94, 196, 0, 0.85);
}

/* ── QSAN Product Line Labels — VI Guideline ── */
/* Used to prefix product names (e.g., "XCubeSAN", "XCubeNAS") */
.qsan-product-line {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--qsan-green);
  background: rgba(94, 196, 0, 0.08);
  border: 1px solid rgba(94, 196, 0, 0.18);
  padding: 0.2em 0.6em;
  border-radius: 3px;
  margin-bottom: 0.4rem;
}

/* ── QCP Certificate Badge — VI Guideline ── */
/* QSAN Certified Partner badge */
.qcp-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, rgba(94,196,0,0.08) 0%, rgba(94,196,0,0.04) 100%);
  border: 1px solid rgba(94, 196, 0, 0.28);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.875rem;
}

.qcp-badge-icon {
  width: 28px; height: 28px;
  background: var(--qsan-green);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 900;
  font-family: var(--font-display);
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

.qcp-badge-info {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.qcp-badge-title {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}

.qcp-badge-sub {
  font-size: 0.575rem;
  font-weight: 600;
  color: var(--qsan-green);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav-header.scrolled {
  background: rgba(11, 11, 11, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border), 0 4px 24px rgba(0,0,0,0.6);
}

.nav-container {
  display: flex;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-px);
  height: 72px;
  gap: 2rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  margin-left: 2rem;
  flex: 1;
}

.nav-item { position: relative; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.875rem;
  font-size: 1.3125rem;   /* 0.875rem × 1.5 (50% up) */
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.nav-link:hover {
  color: var(--qsan-green);
  background: var(--qsan-green-tint);
}

.nav-arrow { font-size: 0.65rem; transition: transform var(--transition-fast); }
.nav-item:hover .nav-arrow { transform: rotate(180deg); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.nav-phone {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-phone:hover { color: var(--qsan-green); }

.btn-nav-cta {
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 700;
  transition: filter var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  letter-spacing: 0.02em;
}

.btn-nav-cta:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--qsan-green-glow);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mega Menu */
.mega-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: #141414;
  border: 1px solid var(--border);
  border-top: 2px solid var(--qsan-green);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  box-shadow: 0 24px 64px rgba(0,0,0,0.8);
  min-width: 760px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  pointer-events: none;
  z-index: 200;
}

.mega-menu-sm { min-width: 480px; }

.nav-item:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: all;
}

.mega-menu-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 1.5rem;
  gap: 0;
}

.mega-menu-sm .mega-menu-inner { grid-template-columns: 1fr 1fr; }

.mega-col { padding: 0.75rem 1rem; }
.mega-col + .mega-col { border-left: 1px solid var(--border); }

.mega-title {
  font-size: 0.625rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 0.875rem;
}

.mega-col ul li a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.mega-col ul li a i { color: var(--qsan-green); font-size: 0.75rem; width: 18px; text-align: center; }

.mega-col ul li a:hover {
  background: var(--qsan-green-tint);
  color: var(--qsan-green);
  transform: translateX(3px);
}

.mega-featured { padding: 0.75rem 0.5rem 0.75rem 1.25rem; }

.mega-feature-card {
  background: linear-gradient(135deg, rgba(94,196,0,0.1) 0%, rgba(94,196,0,0.04) 100%);
  border: 1px solid rgba(94, 196, 0, 0.2);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mega-feature-icon { font-size: 1.5rem; color: var(--qsan-green); margin-bottom: 0.25rem; }
.mega-feature-card h5 { font-size: 0.875rem; font-weight: 700; color: var(--text-primary); }
.mega-feature-card p { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.5; flex: 1; }

.mega-feature-btn {
  display: inline-block;
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: auto;
  transition: filter var(--transition-fast);
  align-self: flex-start;
  letter-spacing: 0.02em;
}

.mega-feature-btn:hover { filter: brightness(1.1); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero-section {
  min-height: 100vh;
  background: var(--bg-base);
  position: relative;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
}

.hero-bg { position: absolute; inset: 0; z-index: 0; }

.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(94, 196, 0, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(94, 196, 0, 0.035) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-orb { position: absolute; border-radius: 50%; filter: blur(110px); pointer-events: none; }

.hero-orb-1 {
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(94,196,0,0.16) 0%, transparent 70%);
  top: -250px; left: -200px;
}

.hero-orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(94,196,0,0.08) 0%, transparent 70%);
  bottom: -100px; right: 20%;
}

.hero-orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(94,196,0,0.1) 0%, transparent 70%);
  top: 50%; right: 5%;
}

.hero-particles { position: absolute; inset: 0; overflow: hidden; }

.particle {
  position: absolute;
  width: 2px; height: 2px;
  background: var(--qsan-green);
  border-radius: 50%;
  opacity: 0;
  animation: particle-float 8s infinite ease-in-out;
}

@keyframes particle-float {
  0%   { opacity: 0; transform: translateY(0) scale(0); }
  20%  { opacity: 0.7; transform: translateY(-30px) scale(1); }
  80%  { opacity: 0.3; transform: translateY(-80px) scale(0.8); }
  100% { opacity: 0; transform: translateY(-120px) scale(0); }
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  position: relative;
  z-index: 1;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--qsan-green-tint);
  border: 1px solid rgba(94, 196, 0, 0.3);
  color: var(--qsan-green);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge-dot {
  width: 7px; height: 7px;
  background: var(--qsan-green);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(94, 196, 0, 0.5); }
  50%       { box-shadow: 0 0 0 6px rgba(94, 196, 0, 0); }
}

/* VI Guideline: Display / H1 — Barlow 800, ls -0.03em */
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;         /* VI H1 = ExtraBold 800 */
  line-height: 1.08;
  color: var(--text-primary);
  letter-spacing: -0.03em;  /* VI display tracking */
  margin-bottom: 1.5rem;
}

.hero-title-accent { color: var(--qsan-green); }

.hero-desc {
  font-size: clamp(0.9375rem, 1.5vw, 1.0625rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  font-weight: 400;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.btn-primary-hero {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  transition: filter var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 24px var(--qsan-green-glow);
  letter-spacing: 0.02em;
}

.btn-primary-hero:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(94, 196, 0, 0.42);
}

.btn-secondary-hero {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--border-mid);
  transition: all var(--transition-fast);
}

.btn-secondary-hero:hover {
  background: rgba(255,255,255,0.09);
  border-color: rgba(94, 196, 0, 0.45);
  color: var(--qsan-green);
  transform: translateY(-2px);
}

/* Hero Stats */
.hero-stats { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.hero-stat  { display: flex; flex-direction: column; gap: 0.2rem; }

/* VI Guideline: Statistical numbers — Barlow 800, tabular nums */
.stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.stat-unit  { font-size: 1rem; font-weight: 700; color: var(--qsan-green); }
.stat-label { font-size: 0.75rem; color: var(--text-muted); font-weight: 500; }
.hero-stat-divider { width: 1px; height: 40px; background: var(--border-mid); }

/* ── Hero Product Image ── */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.storage-3d-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
}

.hero-product-img-wrap {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(94, 196, 0, 0.15);
  box-shadow:
    0 0 60px rgba(94, 196, 0, 0.07),
    0 24px 80px rgba(0,0,0,0.75);
  background: #0d0d0d;
}

.hero-product-img {
  width: 100%;
  display: block;
  border-radius: var(--radius-xl);
  object-fit: cover;
  transition: transform 0.6s ease;
}

.hero-product-img-wrap:hover .hero-product-img { transform: scale(1.03); }

.hero-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(11,11,11,0.1) 0%,
    transparent 50%,
    rgba(11,11,11,0.08) 100%
  );
  border-radius: var(--radius-xl);
  pointer-events: none;
}

/* Floating Spec Cards */
.spec-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #1A1A1A;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6), 0 0 0 1px rgba(94,196,0,0.07);
  min-width: 160px;
}

.spec-icon {
  width: 36px; height: 36px;
  background: rgba(94, 196, 0, 0.12);
  border: 1px solid rgba(94, 196, 0, 0.22);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qsan-green);
  font-size: 0.875rem;
  flex-shrink: 0;
}

.spec-info { display: flex; flex-direction: column; }
.spec-val  { font-size: 0.9375rem; font-weight: 700; color: var(--text-primary); line-height: 1.2; }
.spec-desc { font-size: 0.6875rem; color: var(--text-secondary); white-space: nowrap; }

.spec-card-1 { top: -20px;  right: -30px; }
.spec-card-2 { bottom: 30px; right: -40px; }
.spec-card-3 { bottom: -20px; left: -20px; }
.spec-card-4 { top: 30%;    left: -40px; }

/* Hero scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}

.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(180deg, var(--qsan-green) 0%, transparent 100%);
  animation: scroll-line 2s infinite;
}

@keyframes scroll-line {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes float   { 0%,100% { transform: translateY(0); }    50% { transform: translateY(-12px); } }
@keyframes float-2 { 0%,100% { transform: translateY(0); }    50% { transform: translateY(-8px); } }
@keyframes float-3 { 0%,100% { transform: translateY(-6px); } 50% { transform: translateY(6px); } }

.animate-float   { animation: float   5s ease-in-out infinite; }
.animate-float-2 { animation: float-2 6s ease-in-out infinite 1s; }
.animate-float-3 { animation: float-3 4s ease-in-out infinite 0.5s; }

.animate-fade-up {
  opacity: 0; transform: translateY(30px);
  animation: fadeUp 0.7s forwards ease-out;
}

.animate-fade-left {
  opacity: 0; transform: translateX(40px);
  animation: fadeLeft 0.8s forwards ease-out;
}

.animate-slide-up {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-slide-up.visible { opacity: 1; transform: translateY(0); }

.delay-1 { animation-delay: 0.15s; transition-delay: 0.1s; }
.delay-2 { animation-delay: 0.3s;  transition-delay: 0.2s; }
.delay-3 { animation-delay: 0.45s; transition-delay: 0.3s; }
.delay-4 { animation-delay: 0.6s;  transition-delay: 0.4s; }

@keyframes fadeUp  { to { opacity: 1; transform: translateY(0); } }
@keyframes fadeLeft { to { opacity: 1; transform: translateX(0); } }

/* ============================================
   TRUSTED BY
   ============================================ */
.trusted-section {
  padding: 2.5rem 0;
  background: var(--bg-level-1);
  border-bottom: 1px solid var(--border);
}

.trusted-label {
  text-align: center;
  font-size: 0.895rem;      /* 0.6875 × 1.3 */
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.trusted-logos { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; }

.trusted-logo-item {
  padding: 0.975rem 2.275rem;  /* 0.75×1.3 / 1.75×1.3 */
  border-right: 1px solid var(--border);
  opacity: 0.35;
  transition: opacity var(--transition-base);
}

.trusted-logo-item:last-child { border-right: none; }
.trusted-logo-item:hover { opacity: 0.7; }

.trust-logo-text {
  font-size: 1.1375rem;    /* 0.875 × 1.3 */
  font-weight: 700;
  color: var(--gray-3);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

/* ============================================
   WHY IXIT
   ============================================ */
.why-section {
  padding: var(--section-py) 0;
  background: var(--bg-base);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.why-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.why-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-green);
  border-color: rgba(94, 196, 0, 0.28);
}

.why-icon-wrap {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  margin-bottom: 1.25rem;
}

/* VI Guideline: Icon colors use QSAN Green + Gray Scale only */
.why-icon-wrap.cyan  { background: rgba(94,196,0,0.1);  color: var(--qsan-green);       border: 1px solid rgba(94,196,0,0.22); }
.why-icon-wrap.blue  { background: rgba(94,196,0,0.07); color: var(--qsan-green-light);  border: 1px solid rgba(94,196,0,0.15); }
.why-icon-wrap.navy  { background: rgba(61,61,61,0.35); color: var(--gray-3);            border: 1px solid rgba(61,61,61,0.5); }
/* VI alias */
.why-icon-wrap.green { background: rgba(94,196,0,0.1);  color: var(--qsan-green);       border: 1px solid rgba(94,196,0,0.22); }
.why-icon-wrap.gray  { background: rgba(61,61,61,0.35); color: var(--gray-3);            border: 1px solid rgba(61,61,61,0.5); }

.why-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.625rem; }
.why-card p  { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.75; }

/* ============================================
   PRODUCTS SECTION
   ============================================ */
.products-section {
  padding: var(--section-py) 0;
  background: var(--bg-level-1);
  position: relative;
  overflow: hidden;
}

.products-bg-deco {
  position: absolute;
  top: 0; right: 0;
  width: 600px; height: 600px;
  background: radial-gradient(circle at center, rgba(94,196,0,0.04) 0%, transparent 70%);
  pointer-events: none;
}

/* Product Tabs */
.product-tabs {
  display: flex;
  gap: 0.375rem;
  justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
  background: var(--bg-level-2);
  padding: 0.375rem;
  border-radius: var(--radius-full);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  border: 1px solid var(--border);
}

.product-tab {
  padding: 0.5625rem 1.375rem;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  transition: all var(--transition-fast);
  letter-spacing: 0.01em;
}

.product-tab.active {
  background: var(--qsan-green);
  color: #FFFFFF;
  box-shadow: 0 2px 10px rgba(94,196,0,0.35);
}

.product-tab:hover:not(.active) {
  color: var(--qsan-green);
  background: var(--qsan-green-tint);
}

.product-tab-content { display: none; }
.product-tab-content.active { display: block; }

.product-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 1.25rem;
  align-items: start;
}

/* Product Card */
.product-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-green-lg);
  border-color: rgba(94, 196, 0, 0.32);
}

.product-card.featured-product {
  border-color: rgba(94, 196, 0, 0.22);
  box-shadow: 0 4px 24px rgba(94,196,0,0.08);
}

.product-badge {
  position: absolute;
  top: 0.875rem; right: 0.875rem;
  background: var(--qsan-green);
  color: #FFFFFF;
  font-size: 0.625rem;
  font-weight: 800;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  z-index: 2;
}

.new-badge { background: #231F20; border: 1px solid var(--qsan-green); color: var(--qsan-green); }

/* ── Product Visual / Image ── */
.product-visual {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-level-3);
}

.product-visual-img {
  height: 220px;
  padding: 0;
  background: #0d0d0d;
}

.product-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  padding: 0.75rem;
  transition: transform 0.45s ease;
  background: #0d0d0d;
}

.product-img-cover { object-fit: cover; padding: 0; }

/* ── Wide banner image (XN4 / XN3 — ~2:1 ratio) ──
   object-fit: contain → 전체 배너 텍스트 + 제품 모두 표시
   배경을 #0d0d0d로 맞춰 레터박스 방지 */
.product-visual-wide {
  aspect-ratio: 2 / 1;
  height: auto;
  padding: 0;
  background: #0d0d0d;
  overflow: hidden;
  position: relative;
}

.product-visual-wide .product-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
  padding: 0;
  background: #0d0d0d;
}

.product-card:hover .product-img { transform: scale(1.04); }

/* ── Expansion card: fixed 4:3 ratio (matches XD5378 1024×768) ── */
.product-visual-auto {
  aspect-ratio: 4 / 3;
  height: auto;
  padding: 0;
  background: #fff;
  overflow: hidden;
}

.product-visual-auto .product-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0;
  display: block;
  background: #fff;
}

/* Product Info */
.product-info { padding: 1.5rem; }

/* VI Guideline: Product line label — VI caption style */
.product-series {
  font-family: var(--font-primary);
  font-size: 0.6rem;
  font-weight: 800;
  color: var(--qsan-green);
  text-transform: uppercase;
  letter-spacing: 0.14em;   /* VI caption: generous tracking */
  margin-bottom: 0.3rem;
}

/* VI Guideline: Product name — Barlow 800 */
.product-name {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 800;         /* VI H3/product = ExtraBold */
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.product-tagline { font-size: 0.8125rem; color: var(--text-secondary); margin-bottom: 1.25rem; }

.product-specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
  margin-bottom: 1rem;
  padding: 0.875rem 1rem;
  background: var(--bg-level-1);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.p-spec { display: flex; flex-direction: column; gap: 0.1rem; }

.p-spec-label {
  font-size: 0.625rem;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.p-spec-val {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.product-features { display: flex; flex-direction: column; gap: 0.375rem; margin-bottom: 1.25rem; }

.p-feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.p-feature i { color: var(--qsan-green); font-size: 0.7rem; }

.product-actions { display: flex; gap: 0.625rem; }

.btn-product-primary {
  flex: 1;
  text-align: center;
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 700;
  transition: filter var(--transition-fast), box-shadow var(--transition-fast);
  letter-spacing: 0.02em;
}

.btn-product-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 14px var(--qsan-green-glow);
}

.btn-product-secondary {
  text-align: center;
  border: 1px solid var(--border-mid);
  color: var(--text-secondary);
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.btn-product-secondary:hover { border-color: rgba(94,196,0,0.4); color: var(--qsan-green); }

/* ============================================
   XS1216 PRODUCT DETAIL CARD
   Extended layout for datasheet-verified product
   ============================================ */

/* Spec detail rows (icon + label + value) */
.xs1216-spec-detail {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.125rem;
  padding: 0.875rem 1rem;
  background: var(--bg-level-1);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.xs-spec-row {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-size: 0.8rem;
}

.xs-spec-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qsan-green);
  font-size: 0.7rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.xs-spec-row > div {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
}

.xs-spec-key {
  font-size: 0.6rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1.2;
}

.xs-spec-val {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Performance bar — 3 key metrics */
.xs1216-perf-bar {
  display: flex;
  align-items: center;
  gap: 0;
  background: linear-gradient(135deg, rgba(94,196,0,0.07) 0%, rgba(94,196,0,0.03) 100%);
  border: 1px solid rgba(94, 196, 0, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1.125rem;
}

.perf-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.75rem 0.5rem;
}

.perf-val {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--qsan-green);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.perf-label {
  font-size: 0.575rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.perf-divider {
  width: 1px;
  height: 36px;
  background: rgba(94, 196, 0, 0.18);
  flex-shrink: 0;
}

/* Featured product gets taller visual */
#product-xs1216 .product-visual {
  height: 240px;
}

/* Datasheet source badge */
.datasheet-source {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.575rem;
  font-weight: 700;
  color: var(--qsan-green);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.75;
  margin-top: 0.5rem;
}

/* Solution Cards */
.solution-cards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

.sol-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.sol-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-green);
  border-color: rgba(94,196,0,0.28);
}

.sol-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1.125rem;
}

.ai-icon        { background: rgba(94,196,0,0.1); color: var(--qsan-green); border: 1px solid rgba(94,196,0,0.2); }
.broadcast-icon { background: rgba(114,217,0,0.1); color: var(--qsan-green-light); border: 1px solid rgba(114,217,0,0.2); }
.backup-icon    { background: rgba(143,224,0,0.08); color: var(--green-neon); border: 1px solid rgba(143,224,0,0.15); }
.virt-icon      { background: rgba(61,61,61,0.5); color: var(--gray-3); border: 1px solid rgba(61,61,61,0.7); }

.sol-card h3 { font-size: 0.9375rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; }
.sol-card p  { font-size: 0.8125rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 0.875rem; }

.sol-features { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 1.125rem; }

.sol-features li {
  font-size: 0.8125rem; color: var(--text-secondary);
  padding-left: 1rem; position: relative;
}

.sol-features li::before { content: '→'; position: absolute; left: 0; color: var(--qsan-green); font-size: 0.7rem; }

.sol-cta {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.8125rem; font-weight: 700; color: var(--qsan-green);
  transition: gap var(--transition-fast);
}

.sol-cta:hover { gap: 0.7rem; }

.products-cta-wrap { text-align: center; margin-top: 3rem; }

.btn-all-products {
  display: inline-flex; align-items: center; gap: 0.6rem;
  border: 2px solid var(--qsan-green);
  color: var(--qsan-green);
  padding: 0.875rem 2.5rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem; font-weight: 700;
  transition: all var(--transition-fast);
}

.btn-all-products:hover {
  background: var(--qsan-green);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--qsan-green-glow);
}

/* ============================================
   INDUSTRY / SOLUTIONS SECTION
   ============================================ */
.industry-section {
  padding: var(--section-py) 0;
  background: var(--bg-base);
}

.industry-section .section-tag    { background: var(--qsan-green-tint); color: var(--qsan-green); border-color: rgba(94,196,0,0.28); }
.industry-section .section-title  { color: var(--text-primary); }
.industry-section .section-desc   { color: var(--text-secondary); }
.industry-section .text-accent    { color: var(--qsan-green); }

.industry-tab-nav {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.industry-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.industry-tab-btn i { font-size: 0.9rem; }
.industry-tab-btn.active { color: var(--qsan-green); border-bottom-color: var(--qsan-green); }
.industry-tab-btn:hover:not(.active) { color: var(--text-secondary); }

.industry-content { display: none; }
.industry-content.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

/* VI Guideline: Industry section H3 — Barlow 700 */
.industry-info h3 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;          /* VI H2 weight */
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.025em;  /* VI H2 tracking */
  line-height: 1.15;
}

.industry-info p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 1.5rem; font-size: 0.9375rem; }

.industry-benefits { display: flex; flex-direction: column; gap: 0.625rem; margin-bottom: 2rem; }

.industry-benefits li {
  display: flex; align-items: center; gap: 0.75rem;
  font-size: 0.9375rem; color: var(--text-secondary);
}

.industry-benefits li i { color: var(--qsan-green); font-size: 0.875rem; }

.btn-industry {
  display: inline-flex; align-items: center;
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem; font-weight: 700;
  transition: filter var(--transition-fast), transform var(--transition-fast);
  letter-spacing: 0.02em;
}

.btn-industry:hover { filter: brightness(1.1); transform: translateY(-2px); }

/* Industry Visuals */
.industry-visual {
  height: 320px;
  border-radius: var(--radius-xl);
  display: flex; align-items: flex-end; justify-content: flex-start;
  padding: 2rem;
  position: relative; overflow: hidden;
  border: 1px solid var(--border);
}

.ai-visual-bg        { background: linear-gradient(135deg, #080e04 0%, #0c1208 100%); }
.ai-visual-bg::before,
.broadcast-visual-bg::before,
.medical-visual-bg::before,
.finance-visual-bg::before,
.education-visual-bg::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 40% 40%, rgba(94,196,0,0.1) 0%, transparent 60%);
}

.broadcast-visual-bg   { background: linear-gradient(135deg, #0c0e06 0%, #0a0c07 100%); }
.medical-visual-bg     { background: linear-gradient(135deg, #070d07 0%, #090c08 100%); }
.finance-visual-bg     { background: linear-gradient(135deg, #080c08 0%, #0b0e09 100%); }
.education-visual-bg   { background: linear-gradient(135deg, #0a0d07 0%, #0b0b0b 100%); }

.industry-metrics { display: flex; gap: 1.25rem; position: relative; z-index: 1; flex-wrap: wrap; }

.i-metric {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(94,196,0,0.18);
  border-radius: var(--radius-md);
  padding: 0.875rem 1.125rem;
  display: flex; flex-direction: column; gap: 0.25rem;
}

.i-m-val { font-family: var(--font-display); font-size: 1.25rem; font-weight: 800; color: var(--qsan-green); letter-spacing: -0.02em; }
.i-m-label { font-size: 0.6875rem; color: var(--text-secondary); font-weight: 500; white-space: nowrap; }

/* ============================================
   CASE STUDIES
   ============================================ */
.case-section { padding: var(--section-py) 0; background: var(--bg-level-1); }

.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }

.case-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  display: flex; flex-direction: column; gap: 1.125rem;
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-green);
  border-color: rgba(94,196,0,0.28);
}

.case-industry-tag {
  display: inline-block;
  font-size: 0.625rem; font-weight: 800;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  text-transform: uppercase; letter-spacing: 0.08em;
}

/* VI Guideline: Tag colors — QSAN Green + Gray Scale only */
.ai-tag        { background: rgba(94,196,0,0.1);  color: var(--qsan-green); }
.broadcast-tag { background: rgba(61,61,61,0.45); color: var(--gray-3); }   /* Gray 1/3 combo */
.medical-tag   { background: rgba(94,196,0,0.08); color: var(--qsan-green-light); }
.finance-tag   { background: rgba(109,110,112,0.25); color: var(--gray-3); } /* Gray 2 */
.education-tag { background: rgba(94,196,0,0.06); color: var(--qsan-green-dark); }

.case-header { display: flex; align-items: center; gap: 1rem; }

.case-company-icon {
  width: 44px; height: 44px;
  background: var(--bg-level-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.125rem; color: var(--qsan-green); flex-shrink: 0;
}

.case-company-info h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.15rem; }
.case-company-info span { font-size: 0.75rem; color: var(--text-secondary); }

.case-quote {
  font-size: 0.875rem; color: var(--text-secondary); line-height: 1.75;
  font-style: italic;
  border-left: 3px solid var(--qsan-green);
  padding-left: 1rem; flex: 1;
}

.case-results {
  display: flex; gap: 0.875rem;
  padding-top: 1.125rem;
  border-top: 1px solid var(--border);
}

.case-result { flex: 1; text-align: center; }

.r-val {
  display: block;
  font-family: var(--font-display);
  font-size: 1.375rem; font-weight: 800;
  color: var(--qsan-green); letter-spacing: -0.025em;
}

.r-label { font-size: 0.6875rem; color: var(--text-secondary); font-weight: 500; }

/* ============================================
   SUPPORT SECTION
   ============================================ */
.support-section { padding: var(--section-py) 0; background: var(--bg-base); }

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.125rem;
  margin-top: 2.5rem;
}

.support-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.625rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.support-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-green);
  border-color: rgba(94,196,0,0.28);
}

.support-icon {
  width: 42px; height: 42px;
  background: rgba(94,196,0,0.08);
  border: 1px solid rgba(94,196,0,0.18);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--qsan-green); font-size: 1rem; margin-bottom: 0.875rem;
}

.support-card h4 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.45rem; }
.support-card p  { font-size: 0.8125rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 0.75rem; }
.support-contact { font-size: 0.8125rem; font-weight: 700; color: var(--qsan-green); cursor: pointer; transition: color var(--transition-fast); }
.support-contact:hover { color: var(--qsan-green-light); }

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-section { padding: var(--section-py) 0; background: var(--bg-level-1); }

.contact-grid { display: grid; grid-template-columns: 1fr 1.25fr; gap: 5rem; align-items: start; }

/* VI Guideline: Contact H2 — Barlow 700 */
.contact-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.5vw, 2.25rem);
  font-weight: 700;          /* VI H2 */
  line-height: 1.2;
  color: var(--text-primary);
  margin: 0.75rem 0 1rem;
  letter-spacing: -0.025em;
}

.contact-desc { font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 2rem; }

.contact-details { display: flex; flex-direction: column; gap: 1.125rem; margin-bottom: 2rem; }
.contact-detail-item { display: flex; align-items: flex-start; gap: 1rem; }

.cd-icon {
  width: 38px; height: 38px;
  background: rgba(94,196,0,0.08);
  border: 1px solid rgba(94,196,0,0.18);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--qsan-green); font-size: 0.8125rem; flex-shrink: 0;
}

.contact-detail-item > div { display: flex; flex-direction: column; gap: 0.2rem; }
.contact-detail-item strong { font-size: 0.6875rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
.contact-detail-item span  { font-size: 0.9rem; color: var(--text-primary); font-weight: 500; }

.contact-certifications { display: flex; gap: 0.625rem; flex-wrap: wrap; }

.cert-badge {
  display: flex; align-items: center; gap: 0.4rem;
  background: var(--bg-level-2); border: 1px solid var(--border);
  padding: 0.375rem 0.75rem; border-radius: var(--radius-full);
  font-size: 0.6875rem; font-weight: 700; color: var(--text-secondary);
}

.cert-badge i { color: var(--qsan-green); }

/* Contact Form */
.contact-form-wrap {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.form-group { display: flex; flex-direction: column; gap: 0.375rem; margin-bottom: 1rem; }
.form-row .form-group { margin-bottom: 0; }
.form-group label { font-size: 0.75rem; font-weight: 700; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.06em; }
.required { color: var(--qsan-green); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border-mid);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-primary);
  background: var(--bg-level-1);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  font-family: var(--font-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--qsan-green);
  box-shadow: 0 0 0 3px rgba(94, 196, 0, 0.1);
}

.form-group textarea { resize: vertical; min-height: 100px; }

.form-group select {
  cursor: pointer; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%236D6E70'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 20px; padding-right: 2.5rem;
  background-color: var(--bg-level-1);
}

.form-group select option { background: var(--bg-level-2); color: var(--text-primary); }

.form-check {
  display: flex; align-items: flex-start; gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.8125rem; color: var(--text-secondary);
}

.form-check input[type="checkbox"] { width: auto; margin-top: 2px; accent-color: var(--qsan-green); flex-shrink: 0; }
.form-check a { color: var(--qsan-green); font-weight: 700; }

.btn-contact-submit {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
  background: var(--qsan-green);
  color: #FFFFFF;
  padding: 0.9375rem;
  border-radius: var(--radius-md);
  font-size: 1rem; font-weight: 700; cursor: pointer;
  transition: filter var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 4px 20px var(--qsan-green-glow);
  letter-spacing: 0.03em;
  font-family: var(--font-primary);
}

.btn-contact-submit:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(94,196,0,0.4);
}

.form-success {
  display: flex; align-items: center; gap: 1rem;
  background: rgba(94,196,0,0.07);
  border: 1px solid rgba(94,196,0,0.28);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem; margin-top: 1rem;
  color: var(--qsan-green);
}

.form-success i { font-size: 1.5rem; flex-shrink: 0; }
.form-success p { font-size: 0.875rem; line-height: 1.5; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer { background: #060606; border-top: 1px solid var(--border); }

.footer-top { padding: clamp(3rem, 6vw, 5rem) 0 3rem; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr 1fr;
  gap: 3rem;
}

.footer-brand { padding-right: 2rem; }

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: 0;
}

.footer-brand-desc { font-size: 0.875rem; color: var(--text-muted); line-height: 1.75; margin-bottom: 1.5rem; }

.footer-socials { display: flex; gap: 0.625rem; }

.social-icon {
  width: 36px; height: 36px;
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.8125rem;
  transition: all var(--transition-fast);
}

.social-icon:hover {
  background: var(--qsan-green);
  border-color: var(--qsan-green);
  color: #FFFFFF;
  transform: translateY(-2px);
}

/* VI Guideline: Footer column titles — VI caption style */
.footer-col-title {
  font-family: var(--font-primary);
  font-size: 0.625rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;    /* VI: uppercase = generous tracking */
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.footer-links { display: flex; flex-direction: column; gap: 0.625rem; }

.footer-links a {
  font-size: 0.8125rem; color: var(--text-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: flex; align-items: center; gap: 0.4rem;
}

.footer-links a:hover { color: var(--qsan-green); transform: translateX(3px); }

.footer-link-icon { color: rgba(94,196,0,0.5); font-size: 0.65rem; }

.footer-contact-mini { margin-top: 1.25rem; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-contact-mini p { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8rem; color: var(--text-muted); }
.footer-contact-mini i { color: var(--qsan-green); font-size: 0.75rem; }

.footer-partner-bar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.125rem 0;
}

.footer-partner-bar .container { display: flex; align-items: center; gap: 2.5rem; flex-wrap: wrap; }

.partner-label {
  font-size: 0.625rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-muted); white-space: nowrap;
}

.partner-logos { display: flex; gap: 2rem; flex-wrap: wrap; align-items: center; }

.partner-logo-text {
  font-size: 0.8125rem; font-weight: 700;
  color: var(--text-muted); letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

.partner-logo-text:hover { color: var(--qsan-green); }

.footer-bottom { padding: 1.375rem 0; }

.footer-bottom-inner {
  display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}

.footer-copy { font-size: 0.8125rem; color: var(--text-muted); }

.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { font-size: 0.8125rem; color: var(--text-muted); transition: color var(--transition-fast); }
.footer-legal a:hover { color: var(--qsan-green); }

.footer-reg { font-size: 0.75rem; color: var(--text-disabled); width: 100%; }

/* Back to Top */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 42px; height: 42px;
  background: var(--qsan-green); color: #FFFFFF;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px var(--qsan-green-glow);
  opacity: 0; visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
  font-size: 0.8125rem; z-index: 500;
}

.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); filter: brightness(1.1); }

/* ============================================
   RESPONSIVE — TABLET (≤1100px)
   ============================================ */
@media (max-width: 1100px) {
  .hero-container { grid-template-columns: 1fr; gap: 3rem; }
  .hero-visual { display: none; }
  .hero-content { max-width: 700px; }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .product-grid .featured-product { grid-column: 1 / -1; }
  .solution-cards-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .case-grid .case-card:last-child { grid-column: 1 / -1; }
  .support-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; gap: 2rem; }
  .footer-brand { grid-column: 1 / -1; padding-right: 0; }
}

/* ============================================
   RESPONSIVE — MOBILE (≤768px)
   ============================================ */
@media (max-width: 768px) {
  :root { --container-px: 1.25rem; }

  .nav-menu, .nav-actions .nav-phone { display: none; }
  .nav-hamburger { display: flex; }

  .nav-menu.open {
    display: flex; flex-direction: column;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(8, 8, 8, 0.98);
    backdrop-filter: blur(20px);
    padding: 1.5rem var(--container-px) 2rem;
    gap: 0.25rem;
    border-top: 1px solid var(--border);
    overflow-y: auto;
    max-height: calc(100vh - 72px);
  }

  .nav-menu.open .nav-link { color: var(--text-secondary); padding: 0.75rem 0; }
  .mega-menu { display: none !important; }

  .hero-title { font-size: 2.25rem; }
  .hero-actions { flex-direction: column; }
  .btn-primary-hero, .btn-secondary-hero { width: 100%; justify-content: center; }
  .hero-stats { gap: 1rem; }
  .hero-stat-divider { display: none; }

  .why-grid            { grid-template-columns: 1fr; }
  .product-grid        { grid-template-columns: 1fr; }
  .solution-cards-grid { grid-template-columns: 1fr; }
  .case-grid           { grid-template-columns: 1fr; }
  .case-grid .case-card:last-child { grid-column: auto; }
  .support-grid        { grid-template-columns: 1fr; }

  .industry-content.active { grid-template-columns: 1fr; }
  .industry-visual { height: 220px; }
  .industry-metrics { gap: 0.75rem; flex-wrap: wrap; }
  .industry-tab-nav { overflow-x: auto; padding-bottom: 0.25rem; }
  .industry-tab-btn { flex-shrink: 0; padding: 0.625rem 1rem; font-size: 0.8125rem; }

  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: 1.5rem; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; }

  .back-to-top { bottom: 1.25rem; right: 1.25rem; }

  /* 모바일 로고 */
  .qsan-badge-text { font-size: 1.1rem; }
  .nav-logo-meta { display: none; }
  .product-tabs { width: 100%; justify-content: flex-start; overflow-x: auto; padding-bottom: 0.25rem; border-radius: var(--radius-lg); }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .trusted-logo-item { padding: 0.5rem 1rem; }
}

/* ============================================
   NEW PRODUCT TABS — 4-Tab Layout
   Unified / Block / Expansion / Compute
   QSAN VI Guideline v10 compliant
   ============================================ */

/* ── Tab Category Header ── */
.tab-category-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
  margin-bottom: 2rem;
  padding: 1.75rem 2rem;
  background: linear-gradient(135deg, var(--bg-level-3) 60%, rgba(94,196,0,0.06) 100%);
  border: 1px solid rgba(94,196,0,0.15);
  border-radius: var(--radius-xl);
  overflow: hidden;
  position: relative;
}

.tab-category-header::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--qsan-green);
  border-radius: var(--radius-xs) 0 0 var(--radius-xs);
}

.tab-cat-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
}

.tab-cat-tag {
  display: inline-block;
  background: var(--qsan-green);
  color: #FFFFFF;
  font-size: 0.8125rem;       /* 0.625 × 1.3 */
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  width: fit-content;
}

.tab-cat-title {
  font-size: 2.1125rem;       /* 1.625 × 1.3 */
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.2;
}

.tab-cat-desc {
  font-size: 1.17rem;         /* 0.9 × 1.3 */
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
  max-width: 640px;
}

/* Lineup comparison image (right side of category header) */
.tab-lineup-img {
  width: 480px;
  max-width: 48%;
  height: auto;
  max-height: 180px;
  object-fit: contain;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
  filter: drop-shadow(0 4px 16px rgba(0,0,0,0.45));
}

/* Coming Soon badge inside header */
.tab-cat-coming-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(94,196,0,0.12);
  border: 1px solid rgba(94,196,0,0.3);
  color: var(--qsan-green);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  margin-top: 0.5rem;
  width: fit-content;
}

/* ── Tab Row Label (NVMe / SATA divider) ── */
.tab-row-label {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--qsan-green);
  padding: 0.5rem 0.875rem;
  background: rgba(94,196,0,0.08);
  border: 1px solid rgba(94,196,0,0.2);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  margin-top: 0.5rem;
}

.tab-row-label i { font-size: 0.7rem; }

.tab-row-label.tab-row-label-gray {
  color: var(--gray-3);
  background: rgba(167,169,172,0.08);
  border-color: rgba(167,169,172,0.2);
  margin-top: 2rem;
}

/* ── Product Grid Variants ── */
/* 3-column equal grid */
.product-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  align-items: stretch;
  margin-bottom: 0.5rem;
}
/* Equal-height cards: fill grid row, push actions to bottom */
.product-grid-3 .product-card { display: flex; flex-direction: column; height: 100%; }
.product-grid-3 .product-info { display: flex; flex-direction: column; flex: 1 1 auto; }
.product-grid-3 .product-actions { margin-top: auto; }

/* 2-column equal grid */
.product-grid-2col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  align-items: start;
}

/* ── Expansion Visual (icon-based, no product image) ── */
.expansion-visual {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, var(--bg-level-3), var(--bg-level-4));
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.expansion-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 120%, rgba(94,196,0,0.1) 0%, transparent 65%);
}

.expansion-icon-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  z-index: 1;
}

.expansion-icon-wrap > i {
  font-size: 2.5rem;
  color: var(--qsan-green);
  opacity: 0.85;
  filter: drop-shadow(0 0 12px rgba(94,196,0,0.4));
}

/* Expansion type tag (Ethernet / SAS) */
.expansion-type-tag {
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.ethernet-tag {
  background: var(--qsan-green);
  color: #FFFFFF;
}

.sas-tag {
  background: var(--bg-level-2);
  color: var(--gray-3);
  border: 1px solid var(--gray-2);
}

/* ── Expansion Image Overlay Tag (positioned on product-visual) ── */
.product-visual { position: relative; }

.expansion-overlay-tag {
  position: absolute;
  bottom: 0.6rem;
  left: 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.28rem 0.7rem;
  border-radius: var(--radius-full);
  z-index: 3;
  backdrop-filter: blur(6px);
}

.expansion-overlay-tag.ethernet-tag {
  background: rgba(94, 196, 0, 0.85);
  color: #fff;
}

.expansion-overlay-tag.sas-tag {
  background: rgba(30, 30, 30, 0.88);
  color: var(--gray-3);
  border: 1px solid rgba(167,169,172,0.35);
}

/* ── Compute Cards Grid ── */
.compute-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.compute-card {
  background: var(--bg-level-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.compute-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--qsan-green), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.compute-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-green-lg);
  border-color: rgba(94,196,0,0.28);
}

.compute-card:hover::before { opacity: 1; }

.compute-card-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-xl);
  background: rgba(94,196,0,0.12);
  border: 1px solid rgba(94,196,0,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.375rem;
  color: var(--qsan-green);
}

.compute-card h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.625rem;
  letter-spacing: -0.015em;
}

.compute-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0 0 1rem;
}

.compute-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.compute-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.compute-features li i {
  color: var(--qsan-green);
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* ── Responsive overrides for new tab layouts ── */
@media (max-width: 1100px) {
  .tab-lineup-img { max-width: 42%; max-height: 150px; }
  .product-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .product-grid-3 .featured-product { grid-column: 1 / -1; }
  .compute-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .tab-category-header {
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  }
  .tab-lineup-img {
    width: 100%;
    max-width: 100%;
    max-height: 140px;
    object-fit: contain;
  }
  .product-grid-3 { grid-template-columns: 1fr; }
  .product-grid-3 .featured-product { grid-column: auto; }
  .product-grid-2col { grid-template-columns: 1fr; }
  .compute-cards-grid { grid-template-columns: 1fr; }
  .tab-cat-title { font-size: 1.375rem; }
}