/* ============================================
   株式会社エトラクト
   Golden Ratio Design System (φ = 1.618)
   ============================================

   Typography Scale: 13 / 14 / 16 / 21 / 26 / 34 / 42 / 55 / 68
   Spacing (Fibonacci): 5 / 8 / 13 / 21 / 34 / 55 / 89 / 144
   Layout: 61.8% / 38.2% | Line-height: 1.618

   ============================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Colors — Brighter scientific dark palette v4 (ettract rebrand 2026-04) */
  --bg: #1a1a40;
  --bg-elevated: #26264e;
  --bg-card: rgba(40,40,82,.55);
  --bg-alt: #18183a;
  --surface: rgba(255,255,255,.08);
  --text: #f4f4fc;
  --text-secondary: #c4c4de;
  --text-tertiary: #9494b4;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --cyan: #06b6d4;
  --cyan-light: #67e8f9;
  --emerald: #10b981;
  --gradient-main: linear-gradient(135deg, #7c3aed 0%, #6366f1 40%, #06b6d4 100%);
  --gradient-text: linear-gradient(135deg, #a78bfa 0%, #818cf8 40%, #67e8f9 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(124,58,237,.1), rgba(6,182,212,.07));
  --glass: rgba(40,40,82,.55);
  --glass-border: rgba(255,255,255,.18);
  --glass-border-hover: rgba(255,255,255,.32);
  --glow-sm: 0 0 32px rgba(124,58,237,.32);
  --glow-md: 0 0 54px rgba(124,58,237,.26), 0 0 108px rgba(6,182,212,.16);
  --glow-lg: 0 0 80px rgba(124,58,237,.32), 0 0 160px rgba(6,182,212,.2);

  /* Typography — Golden Ratio */
  --text-xs: 13px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 21px;
  --text-2xl: 26px;
  --text-3xl: 34px;
  --text-4xl: 42px;
  --text-5xl: 55px;
  --text-hero: clamp(42px, 5.5vw, 68px);

  /* Spacing — Fibonacci */
  --sp-1: 5px;
  --sp-2: 8px;
  --sp-3: 13px;
  --sp-4: 21px;
  --sp-5: 34px;
  --sp-6: 55px;
  --sp-7: 89px;
  --sp-8: 144px;

  /* Layout */
  --line-height: 1.618;
  --max-w: 1200px;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --font: 'Inter', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --ease: cubic-bezier(.4, 0, .2, 1);
}

html { scroll-behavior: smooth; scroll-padding-top: var(--sp-7); }

body {
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: var(--line-height);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  /* Deep space gradient — brighter v4 (ettract rebrand) */
  background:
    radial-gradient(ellipse 80% 50% at 20% 60%, rgba(124,58,237,.16) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(6,182,212,.13) 0%, transparent 50%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(16,185,129,.09) 0%, transparent 40%),
    linear-gradient(180deg, #1a1a40 0%, #222252 25%, #1e1e46 50%, #242450 75%, #1a1a40 100%);
  background-attachment: fixed;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* Utility */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--sp-5); }
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Subtle grid background — applied to body */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(124,58,237,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,.04) 1px, transparent 1px);
  background-size: 55px 55px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent);
}

/* ========== NAVIGATION ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: var(--sp-3) 0;
  background: rgba(7,7,15,.5);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom: 1px solid transparent;
  transition: all .35s var(--ease);
}
.nav.scrolled {
  padding: var(--sp-2) 0;
  border-bottom-color: var(--glass-border);
  background: rgba(7,7,15,.88);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 var(--sp-5);
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center;
}
.logo-img {
  height: 38px; width: auto;
}
.footer-brand .logo-img {
  height: 34px;
}
.nav-links {
  display: flex; align-items: center; gap: var(--sp-5);
  font-size: var(--text-sm); font-weight: 500;
}
.nav-links a {
  color: var(--text-secondary); transition: color .3s var(--ease);
  position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -3px; left: 0;
  width: 0; height: 1.5px; background: var(--gradient-main);
  transition: width .3s var(--ease); border-radius: 1px;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: var(--gradient-main); color: #fff !important;
  padding: var(--sp-2) var(--sp-4); border-radius: var(--sp-2);
  font-weight: 600; box-shadow: var(--glow-sm);
  transition: all .3s var(--ease);
}
.nav-cta::after { display: none; }
.nav-cta:hover { transform: translateY(-1px); box-shadow: var(--glow-md); }

.hamburger { display: none; flex-direction: column; gap: 5px; width: 22px; }
.hamburger span { display: block; height: 2px; background: var(--text); border-radius: 2px; transition: .3s var(--ease); }

/* ========== HERO ========== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: var(--sp-8) var(--sp-5) var(--sp-7);
  overflow: hidden;
}

/* Ambient orbs — BOLD & vivid */
.hero::before {
  content: ''; position: absolute;
  width: 900px; height: 900px; top: -25%; right: -15%;
  background: radial-gradient(circle, rgba(124,58,237,.22) 0%, rgba(99,102,241,.08) 40%, transparent 65%);
  border-radius: 50%; filter: blur(80px); pointer-events: none;
  animation: orbDrift1 18s ease-in-out infinite;
}
.hero::after {
  content: ''; position: absolute;
  width: 700px; height: 700px; bottom: -15%; left: -12%;
  background: radial-gradient(circle, rgba(6,182,212,.16) 0%, rgba(16,185,129,.05) 40%, transparent 65%);
  border-radius: 50%; filter: blur(80px); pointer-events: none;
  animation: orbDrift2 22s ease-in-out infinite;
}
@keyframes orbDrift1 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-30px,40px) scale(1.05); } }
@keyframes orbDrift2 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(25px,-30px) scale(1.08); } }

#heroCanvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: .7; pointer-events: none;
}

.hero-content {
  position: relative; z-index: 2;
  max-width: 760px; text-align: center;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4); border-radius: 100px;
  background: var(--glass); backdrop-filter: blur(12px);
  border: 1px solid rgba(124,58,237,.25);
  font-size: var(--text-xs); font-weight: 600;
  color: var(--cyan-light); letter-spacing: .04em;
  margin-bottom: var(--sp-5);
}
.hero-badge::before {
  content: ''; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px var(--cyan);
  animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .4; } }

.hero-title {
  font-size: var(--text-hero); font-weight: 900;
  line-height: 1.08; letter-spacing: -.03em;
  margin-bottom: var(--sp-4);
}

.hero-sub {
  font-size: var(--text-lg); color: var(--text-secondary);
  line-height: var(--line-height); max-width: 520px;
  margin: 0 auto var(--sp-6);
}

/* Stats — Golden Ratio cards */
.hero-stats {
  display: flex; align-items: stretch; justify-content: center;
  gap: var(--sp-4); margin-bottom: var(--sp-6);
}
.stat {
  flex: 1; max-width: 180px;
  padding: var(--sp-4) var(--sp-4);
  border-radius: var(--radius);
  background: var(--glass); backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  text-align: center; transition: all .35s var(--ease);
}
.stat:hover { border-color: rgba(124,58,237,.25); box-shadow: var(--glow-sm); }
.stat-number {
  font-size: var(--text-4xl); font-weight: 800; line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-unit {
  font-size: var(--text-2xl); font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label {
  display: block; font-size: 11px; color: var(--text-tertiary);
  margin-top: var(--sp-2); font-weight: 500; letter-spacing: .02em;
}

.hero-actions { display: flex; gap: var(--sp-3); justify-content: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5); border-radius: var(--radius-sm);
  font-weight: 600; font-size: var(--text-sm);
  transition: all .35s var(--ease); white-space: nowrap;
  position: relative; overflow: hidden;
}
.btn-primary {
  background: var(--gradient-main); color: #fff;
  box-shadow: 0 4px 21px rgba(124,58,237,.25);
}
.btn-primary::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,.12) 50%, transparent 60%);
  transform: translateX(-120%); transition: transform .7s var(--ease);
}
.btn-primary:hover::after { transform: translateX(120%); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 34px rgba(124,58,237,.3); }
.btn-ghost {
  border: 1px solid var(--glass-border); color: var(--text-secondary);
  background: var(--glass); backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--accent-light); color: var(--text); }
.btn-full { width: 100%; justify-content: center; }

.hero-scroll {
  position: absolute; bottom: var(--sp-5); left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--sp-2);
  font-size: 10px; color: var(--text-tertiary); letter-spacing: 2px; text-transform: uppercase;
}
.scroll-line {
  width: 1px; height: var(--sp-5);
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: scrollAnim 2s ease-in-out infinite;
}
@keyframes scrollAnim { 0%,100% { opacity: .25; transform: scaleY(1); } 50% { opacity: 1; transform: scaleY(1.2); } }

/* ========== SECTIONS ========== */
.section { padding: var(--sp-8) 0; position: relative; }
/* Section backgrounds — brighter gradients with visible color shifts */
.section-dark {
  background:
    radial-gradient(ellipse 50% 40% at 80% 30%, rgba(124,58,237,.1) 0%, transparent 60%),
    radial-gradient(ellipse 40% 50% at 10% 70%, rgba(6,182,212,.08) 0%, transparent 60%),
    linear-gradient(180deg, #121230 0%, #1a1a40 50%, #121230 100%);
}
#strengths {
  background:
    radial-gradient(ellipse 60% 40% at 70% 20%, rgba(124,58,237,.14) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #1c1c42 50%, var(--bg) 100%);
}
#cases {
  background:
    radial-gradient(ellipse 50% 50% at 30% 50%, rgba(6,182,212,.1) 0%, transparent 55%),
    radial-gradient(ellipse 40% 30% at 80% 80%, rgba(124,58,237,.1) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #1a1e3c 50%, var(--bg) 100%);
}
#tech {
  background:
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(124,58,237,.1) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #1a1a3c 50%, var(--bg) 100%);
}
#faq {
  background:
    radial-gradient(ellipse 60% 40% at 40% 60%, rgba(6,182,212,.09) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, #181c38 50%, var(--bg) 100%);
}

.section-header { text-align: center; margin-bottom: var(--sp-7); }
.section-tag {
  display: inline-block;
  padding: var(--sp-1) var(--sp-3); border-radius: 100px;
  background: var(--gradient-subtle); border: 1px solid rgba(124,58,237,.15);
  font-size: 11px; font-weight: 700; color: var(--cyan-light);
  letter-spacing: .12em; text-transform: uppercase; margin-bottom: var(--sp-3);
}
.section-title {
  font-size: clamp(var(--text-3xl), 3.5vw, var(--text-4xl));
  font-weight: 800; line-height: 1.25; letter-spacing: -.02em;
}
.section-desc {
  color: var(--text-secondary); margin-top: var(--sp-3);
  font-size: var(--text-base); max-width: 500px; margin-left: auto; margin-right: auto;
}

/* ========== Scroll Animations (simple, reliable) ========== */
.reveal {
  opacity: 0; transform: translateY(21px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ========== STRENGTHS ========== */
.strengths-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.strength-card {
  background: var(--bg-card); backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius); padding: var(--sp-5) var(--sp-5);
  transition: all .4s var(--ease); position: relative; overflow: hidden;
}
.strength-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--gradient-main); transform: scaleX(0);
  transform-origin: left; transition: transform .5s var(--ease);
}
.strength-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-5px); box-shadow: var(--glow-md);
}
.strength-card:hover::before { transform: scaleX(1); }

.strength-card.featured {
  border-color: rgba(124,58,237,.25);
  background: linear-gradient(180deg, rgba(124,58,237,.1) 0%, var(--bg-elevated) 100%);
}
.strength-card.featured::before { transform: scaleX(1); }

.strength-icon {
  width: var(--sp-6); height: var(--sp-6); border-radius: var(--radius-sm);
  background: var(--gradient-subtle); border: 1px solid rgba(124,58,237,.15);
  display: grid; place-items: center;
  margin-bottom: var(--sp-4); color: var(--cyan);
  transition: all .35s var(--ease);
}
.strength-card:hover .strength-icon { box-shadow: 0 0 21px rgba(6,182,212,.15); }
.strength-card h3 { font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--sp-2); letter-spacing: -.01em; }
.strength-card p { color: var(--text-secondary); font-size: var(--text-sm); line-height: var(--line-height); }
.strength-tag {
  display: inline-block; margin-top: var(--sp-4);
  padding: var(--sp-1) var(--sp-3); border-radius: var(--sp-2);
  font-size: var(--text-xs); font-weight: 600;
  background: rgba(6,182,212,.08); color: var(--cyan);
  border: 1px solid rgba(6,182,212,.12);
}

/* ========== SERVICES ========== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.service-card {
  background: var(--bg-card); backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius); padding: var(--sp-5);
  transition: all .4s var(--ease); position: relative; overflow: hidden;
}
.service-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-4px); box-shadow: var(--glow-md);
}
.service-num {
  font-size: var(--text-5xl); font-weight: 900; line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  opacity: .15; margin-bottom: var(--sp-3);
}
.service-card h3 {
  font-size: var(--text-base); font-weight: 700;
  margin-bottom: var(--sp-2); line-height: 1.5; letter-spacing: -.01em;
}
.service-card p {
  color: var(--text-secondary); font-size: var(--text-sm);
  line-height: var(--line-height); margin-bottom: var(--sp-3);
}
.service-tags { display: flex; flex-wrap: wrap; gap: var(--sp-1); }
.service-tags span {
  padding: 3px var(--sp-2); border-radius: var(--sp-1);
  font-size: 11px; font-weight: 500;
  background: rgba(6,182,212,.05); border: 1px solid rgba(6,182,212,.1);
  color: var(--text-tertiary); transition: all .3s var(--ease);
}
.service-card:hover .service-tags span { color: var(--cyan); border-color: rgba(6,182,212,.2); }

/* ========== CASE STUDIES ========== */
.case-filters {
  display: flex; justify-content: center; gap: var(--sp-2); margin-bottom: var(--sp-6); flex-wrap: wrap;
}
.filter-btn {
  padding: var(--sp-2) var(--sp-4); border-radius: 100px;
  font-size: var(--text-xs); font-weight: 500;
  color: var(--text-secondary); border: 1px solid var(--glass-border);
  background: var(--glass); transition: all .3s var(--ease);
}
.filter-btn:hover { border-color: var(--glass-border-hover); color: var(--text); }
.filter-btn.active {
  background: var(--gradient-main); color: #fff;
  border-color: transparent; box-shadow: var(--glow-sm);
}

.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.case-card {
  background: var(--bg-card); backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius); padding: var(--sp-5);
  transition: all .4s var(--ease); display: flex; flex-direction: column;
}
.case-card:hover {
  border-color: var(--glass-border-hover);
  transform: translateY(-3px); box-shadow: var(--glow-md);
}
.case-card.featured-case {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(124,58,237,.05), rgba(6,182,212,.03));
  border-color: rgba(124,58,237,.2);
}

.case-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: var(--sp-3);
}
.case-badge {
  padding: 3px var(--sp-2); border-radius: var(--sp-1);
  font-size: 11px; font-weight: 600;
  background: rgba(124,58,237,.1); color: var(--accent-light);
  border: 1px solid rgba(124,58,237,.15);
}
.badge-gold { background: rgba(234,179,8,.08); color: #fbbf24; border-color: rgba(234,179,8,.15); }
.case-impact { text-align: right; }
.impact-number {
  font-size: var(--text-2xl); font-weight: 800; line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.impact-label { font-size: 11px; color: var(--text-tertiary); margin-top: 2px; }

.case-card h3 {
  font-size: var(--text-sm); font-weight: 700;
  margin-bottom: var(--sp-2); line-height: 1.5; letter-spacing: -.01em;
}
.case-card > p {
  color: var(--text-secondary); font-size: var(--text-xs);
  line-height: var(--line-height); margin-bottom: var(--sp-3); flex: 1;
}
.case-results { margin-bottom: var(--sp-3); }
.result-item {
  display: flex; align-items: flex-start; gap: var(--sp-2);
  margin-bottom: var(--sp-2); font-size: var(--text-xs);
  color: var(--text-secondary);
}
.result-icon { color: var(--emerald); flex-shrink: 0; margin-top: 1px; }
.result-item strong { color: var(--text); font-weight: 600; }

.case-tech { display: flex; flex-wrap: wrap; gap: 4px; margin-top: auto; }
.case-tech span {
  padding: 2px var(--sp-2); border-radius: 4px;
  font-size: 10px; font-weight: 500;
  background: var(--surface); border: 1px solid var(--glass-border);
  color: var(--text-tertiary);
}

/* ========== PROCESS ========== */
.process-timeline { max-width: 650px; margin: 0 auto; position: relative; }
.process-timeline::before {
  content: ''; position: absolute; left: 28px; top: 0; bottom: 0;
  width: 1.5px;
  background: linear-gradient(to bottom, var(--accent), var(--cyan), transparent);
}
.process-step {
  display: flex; gap: var(--sp-5); margin-bottom: var(--sp-5);
  position: relative;
}
.step-number {
  width: var(--sp-6); height: var(--sp-6); border-radius: 50%; flex-shrink: 0;
  background: var(--bg); border: 2px solid var(--accent);
  display: grid; place-items: center;
  font-size: var(--text-sm); font-weight: 800; color: var(--accent-light);
  position: relative; z-index: 1;
  transition: all .35s var(--ease);
}
.process-step:hover .step-number {
  border-color: var(--cyan); color: var(--cyan-light);
  box-shadow: 0 0 21px rgba(6,182,212,.2);
}
.step-content { padding-top: var(--sp-2); }
.step-content h3 { font-size: var(--text-lg); font-weight: 700; margin-bottom: var(--sp-1); letter-spacing: -.01em; }
.step-content p { color: var(--text-secondary); font-size: var(--text-sm); line-height: var(--line-height); }
.step-time {
  display: inline-block; margin-top: var(--sp-2);
  font-size: 11px; font-weight: 600; color: var(--cyan);
  background: rgba(6,182,212,.06); border: 1px solid rgba(6,182,212,.12);
  padding: 2px var(--sp-2); border-radius: var(--sp-1);
}

/* ========== TECH STACK ========== */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.tech-category {
  background: var(--bg-card); backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius); padding: var(--sp-5);
  transition: all .35s var(--ease);
}
.tech-category:hover { border-color: var(--glass-border-hover); }
.tech-category h4 {
  font-size: 11px; font-weight: 700; color: var(--cyan);
  margin-bottom: var(--sp-3); letter-spacing: .1em; text-transform: uppercase;
}
.tech-items { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.tech-items span {
  padding: var(--sp-2) var(--sp-3); border-radius: var(--sp-2);
  font-size: var(--text-xs); font-weight: 500;
  background: var(--surface); border: 1px solid var(--glass-border);
  color: var(--text-secondary); transition: all .3s var(--ease);
}
.tech-items span:hover {
  border-color: rgba(6,182,212,.3); color: var(--text);
  background: rgba(6,182,212,.05); box-shadow: 0 0 13px rgba(6,182,212,.1);
}

/* ========== MESSAGE ========== */
/* max-width: 1200 * 0.618 ≈ 741px (golden ratio of container) */
.message-block { max-width: 741px; margin: 0 auto; text-align: center; }
.message-block blockquote {
  font-size: clamp(var(--text-xl), 2.5vw, var(--text-2xl));
  font-weight: 700; line-height: var(--line-height); /* 1.618 — golden ratio */
  margin: var(--sp-5) 0 var(--sp-5);
  background: var(--gradient-text);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.message-body {
  color: var(--text-secondary); font-size: var(--text-sm);
  line-height: 1.9; text-align: left;
}
.message-author {
  display: flex; align-items: center; gap: var(--sp-3);
  justify-content: center; margin-top: var(--sp-6);
}
.author-avatar {
  width: var(--sp-6); height: var(--sp-6); border-radius: 50%;
  background: var(--gradient-main);
  display: grid; place-items: center;
  font-weight: 800; font-size: var(--text-lg); color: #fff;
  box-shadow: var(--glow-sm);
}
.author-name { font-weight: 700; font-size: var(--text-sm); }
.author-company { font-size: var(--text-xs); color: var(--text-tertiary); }

/* ========== FAQ ========== */
.faq-list { max-width: 680px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--glass-border); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-4) 0; font-size: var(--text-base);
  font-weight: 600; text-align: left;
  color: var(--text); transition: color .3s var(--ease);
}
.faq-question:hover { color: var(--cyan-light); }
.faq-icon { transition: transform .35s var(--ease); flex-shrink: 0; margin-left: var(--sp-3); color: var(--text-tertiary); }
.faq-item.open .faq-icon { transform: rotate(180deg); color: var(--cyan); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .45s var(--ease), padding .45s var(--ease); }
.faq-item.open .faq-answer { max-height: 300px; padding-bottom: var(--sp-4); }
.faq-answer p { color: var(--text-secondary); font-size: var(--text-sm); line-height: 1.8; }

/* ========== CTA / CONTACT ========== */
.cta-section { padding: var(--sp-7) 0 var(--sp-8); }
.cta-block {
  background: var(--glass); backdrop-filter: blur(21px);
  border: 1px solid rgba(124,58,237,.2);
  border-radius: var(--radius-lg); padding: var(--sp-7) var(--sp-6);
  text-align: center; position: relative; overflow: hidden;
  box-shadow: var(--glow-lg);
  animation: ctaBreathe 6s ease-in-out infinite;
}
/* Breathing glow effect */
@keyframes ctaBreathe {
  0%, 100% {
    box-shadow: 0 0 40px rgba(124,58,237,.12), 0 0 80px rgba(6,182,212,.06);
    border-color: rgba(124,58,237,.2);
  }
  50% {
    box-shadow: 0 0 60px rgba(124,58,237,.2), 0 0 120px rgba(6,182,212,.12), 0 0 180px rgba(124,58,237,.06);
    border-color: rgba(124,58,237,.3);
  }
}
/* Top gradient accent line */
.cta-block::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent 5%, rgba(124,58,237,.4) 30%, rgba(6,182,212,.5) 50%, rgba(124,58,237,.4) 70%, transparent 95%);
  animation: ctaLineShimmer 4s ease-in-out infinite;
}
/* Bottom gradient accent line */
.cta-block::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent 5%, rgba(6,182,212,.3) 30%, rgba(124,58,237,.4) 50%, rgba(6,182,212,.3) 70%, transparent 95%);
  animation: ctaLineShimmer 4s ease-in-out infinite 2s;
}
@keyframes ctaLineShimmer {
  0%, 100% { opacity: .4; transform: scaleX(.6); }
  50% { opacity: 1; transform: scaleX(1); }
}

.cta-block h2 {
  font-size: clamp(var(--text-2xl), 3.2vw, var(--text-3xl));
  font-weight: 800; line-height: 1.5;
  margin-bottom: var(--sp-3); letter-spacing: -.02em;
}
.cta-block > p { color: var(--text-secondary); margin-bottom: var(--sp-6); font-size: var(--text-sm); }

/* max-width: 1200 * 0.382 * 1.618 ≈ 550 → keep Fibonacci-aligned at 555px */
.contact-form { max-width: 555px; margin: 0 auto; text-align: left; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-3); }
.form-group { margin-bottom: var(--sp-4); }
.form-group label {
  display: block; font-size: 11px; font-weight: 700;
  color: var(--text-secondary); margin-bottom: var(--sp-2);
  letter-spacing: .05em; text-transform: uppercase;
}
.form-group input,
.form-group textarea {
  width: 100%; padding: var(--sp-3) var(--sp-3);
  border-radius: var(--radius-sm); font-size: var(--text-sm);
  background: var(--surface); border: 1px solid var(--glass-border);
  color: var(--text); font-family: var(--font);
  transition: all .3s var(--ease); outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-tertiary); }
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124,58,237,.1), var(--glow-sm);
}
.form-group textarea { resize: vertical; }

/* ========== FOOTER ========== */
.footer { border-top: 1px solid var(--glass-border); padding: var(--sp-7) 0 var(--sp-5); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.618fr 1fr 1fr 1fr 1fr; /* Golden ratio + 4 link cols */
  gap: var(--sp-5); margin-bottom: var(--sp-6);
}
.footer-brand p { color: var(--text-tertiary); font-size: var(--text-xs); margin-top: var(--sp-3); line-height: 1.8; }
.footer-links h4 {
  font-size: 11px; font-weight: 700; color: var(--cyan);
  margin-bottom: var(--sp-3); letter-spacing: .05em; text-transform: uppercase;
}
.footer-links a {
  display: block; font-size: var(--text-xs); color: var(--text-tertiary);
  margin-bottom: var(--sp-2); transition: color .3s var(--ease);
}
.footer-links a:hover { color: var(--text); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--sp-4); border-top: 1px solid var(--glass-border);
}
.footer-company p { font-size: var(--text-xs); color: var(--text-secondary); font-weight: 500; }
.footer-copy { font-size: var(--text-xs); color: var(--text-tertiary); }

/* ========== RESPONSIVE ========== */

/* --- Tablet (1024px) --- */
@media (max-width: 1024px) {
  .strengths-grid, .services-grid, .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .case-card.featured-case { grid-column: 1 / -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid .footer-brand { grid-column: 1 / -1; }

  .message-block { max-width: 600px; }
  .message-block blockquote { font-size: var(--text-xl); }
}

/* --- Mobile (768px) --- */
@media (max-width: 768px) {
  :root {
    --sp-5: 24px; --sp-6: 40px; --sp-7: 64px; --sp-8: 100px;
    --text-hero: clamp(32px, 8vw, 42px);
  }

  /* Navigation */
  .nav-links {
    display: none; position: fixed; inset: 0;
    background: rgba(7,7,15,.97); backdrop-filter: blur(21px);
    flex-direction: column; align-items: center; justify-content: center;
    gap: var(--sp-4); font-size: var(--text-xl); z-index: 999;
  }
  .nav-links.open { display: flex; }
  .nav-links a::after { display: none; }
  .hamburger { display: flex; z-index: 1001; }
  .hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  /* Grids → single column */
  .strengths-grid, .services-grid, .cases-grid, .tech-grid { grid-template-columns: 1fr; }
  .case-card.featured-case { grid-column: auto; }

  /* Hero */
  .hero { padding: 100px 21px 55px; min-height: auto; }
  .hero-content { max-width: 100%; }
  .hero-badge { font-size: 11px; padding: 6px 14px; margin-bottom: 21px; }
  .hero-title { font-size: var(--text-hero); margin-bottom: 16px; }
  .hero-sub { font-size: var(--text-base); margin-bottom: 34px; }
  .hero-sub br { display: none; } /* Let text reflow naturally on mobile */
  .hero-stats { flex-direction: row; flex-wrap: wrap; justify-content: center; gap: 13px; }
  .stat { flex: 1; min-width: 140px; max-width: 180px; padding: 16px 13px; }
  .stat-number { font-size: var(--text-3xl); }
  .stat-unit { font-size: var(--text-xl); }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
  .hero-scroll { display: none; }

  /* Sections */
  .section { padding: var(--sp-7) 0; }
  .section-header { margin-bottom: var(--sp-6); }
  .section-title { font-size: var(--text-2xl); }
  .section-desc { font-size: var(--text-sm); }

  /* Strengths */
  .strength-card { padding: var(--sp-4); }
  .strength-card h3 { font-size: var(--text-lg); }

  /* Services */
  .service-card { padding: var(--sp-4); }
  .service-num { font-size: var(--text-4xl); }

  /* Cases */
  .case-filters { gap: 6px; }
  .filter-btn { padding: 6px 14px; font-size: 12px; }
  .impact-number { font-size: var(--text-xl); }

  /* Process */
  .process-timeline::before { left: 27px; }
  .process-step { gap: var(--sp-4); }
  .step-number { width: var(--sp-6); height: var(--sp-6); font-size: var(--text-xs); }
  .step-content h3 { font-size: var(--text-base); }

  /* Message — prevent orphan line breaks */
  .message-block { max-width: 100%; }
  .message-block blockquote {
    font-size: var(--text-lg);
    line-height: 1.7;
  }
  .message-block blockquote br { display: none; } /* Let text reflow naturally */
  .message-body { font-size: var(--text-xs); }

  /* CTA */
  .cta-block { padding: var(--sp-6) var(--sp-4); }
  .cta-block h2 { font-size: var(--text-xl); }
  .form-row { grid-template-columns: 1fr; }

  /* FAQ */
  .faq-question { font-size: var(--text-sm); padding: var(--sp-3) 0; }

  /* Footer */
  .footer { padding: var(--sp-6) 0 var(--sp-4); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-4); }
  .footer-bottom { flex-direction: column; gap: var(--sp-2); text-align: center; }
  .footer-company p { font-size: 11px; }
}

/* --- Small Mobile (480px) --- */
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero { padding: 89px 16px 40px; }
  .hero-title { font-size: 32px; letter-spacing: -.02em; }
  .hero-sub { font-size: var(--text-sm); }
  .hero-stats { flex-direction: column; align-items: stretch; }
  .stat { max-width: 100%; }
  .stat-number { font-size: var(--text-2xl); }

  .section-title { font-size: var(--text-xl); }
  .strength-card h3, .service-card h3 { font-size: var(--text-base); }

  .message-block blockquote { font-size: var(--text-base); }
  .cta-block h2 { font-size: var(--text-lg); }

  .author-avatar { width: 44px; height: 44px; font-size: var(--text-sm); }
  .author-name { font-size: var(--text-xs); }
}

/* Hidden utility */
.case-card[data-hidden="true"] { display: none; }

/* ================================================================
   AMBIENT BACKGROUND EFFECTS — CSS-only, zero JS
   Performance: GPU-composited transforms, long animation cycles
   ================================================================ */

/* --- 1. Floating Orbs (per-section ambient glow) --- */

/* Strengths: Purple orb top-right, cyan orb bottom-left */
#strengths { overflow: hidden; }
#strengths::before {
  content: ''; position: absolute;
  width: 500px; height: 500px; top: -10%; right: -8%;
  background: radial-gradient(circle, rgba(124,58,237,.15) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-a 16s ease-in-out infinite;
  will-change: transform;
}
#strengths::after {
  content: ''; position: absolute;
  width: 400px; height: 400px; bottom: -8%; left: -5%;
  background: radial-gradient(circle, rgba(6,182,212,.1) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-b 20s ease-in-out infinite;
  will-change: transform;
}

/* Services: Cyan orb top-left, purple orb center-right */
#services { overflow: hidden; }
#services::before {
  content: ''; position: absolute;
  width: 450px; height: 450px; top: -5%; left: -6%;
  background: radial-gradient(circle, rgba(6,182,212,.12) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-b 18s ease-in-out infinite;
  will-change: transform;
}
#services::after {
  content: ''; position: absolute;
  width: 350px; height: 350px; top: 40%; right: -5%;
  background: radial-gradient(circle, rgba(124,58,237,.12) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-a 14s ease-in-out infinite;
  will-change: transform;
}

/* Cases: Large diffuse center orb */
#cases { overflow: hidden; }
#cases::before {
  content: ''; position: absolute;
  width: 600px; height: 600px; top: 20%; left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(124,58,237,.08) 0%, rgba(6,182,212,.05) 40%, transparent 65%);
  border-radius: 50%; filter: blur(80px); pointer-events: none;
  animation: orbPulse 12s ease-in-out infinite;
  will-change: transform, opacity;
}

/* Process: Emerald accent orb */
#process { overflow: hidden; }
#process::before {
  content: ''; position: absolute;
  width: 500px; height: 500px; top: -5%; right: -10%;
  background: radial-gradient(circle, rgba(124,58,237,.12) 0%, rgba(6,182,212,.06) 40%, transparent 65%);
  border-radius: 50%; filter: blur(70px); pointer-events: none;
  animation: orbFloat-a 18s ease-in-out infinite;
  will-change: transform;
}

/* Process: Blueprint grid behind timeline */
.process-timeline::after {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(124,58,237,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,.02) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,.3) 10%, rgba(0,0,0,.3) 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,.3) 10%, rgba(0,0,0,.3) 90%, transparent 100%);
}

/* Process: Glowing pulse dots at each step node */
.step-number::before {
  content: ''; position: absolute; inset: -4px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid rgba(124,58,237,.15);
  animation: stepRing 4s ease-in-out infinite;
  pointer-events: none;
}
.step-number::after {
  content: ''; position: absolute; inset: -10px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid rgba(6,182,212,.08);
  animation: stepRing 4s ease-in-out infinite 1s;
  pointer-events: none;
}
@keyframes stepRing {
  0%, 100% { transform: scale(1); opacity: .6; }
  50% { transform: scale(1.2); opacity: 0; }
}

/* Process: Subtle glow behind each step on hover */
.process-step::before {
  content: ''; position: absolute;
  left: 10px; top: 10px; width: 40px; height: 40px;
  background: radial-gradient(circle, rgba(124,58,237,.12) 0%, transparent 70%);
  border-radius: 50%; filter: blur(15px); pointer-events: none;
  opacity: 0; transition: opacity .5s var(--ease);
  z-index: 0;
}
.process-step:hover::before { opacity: 1; }

/* Process: Second orb bottom-left (cyan) */
#process .container::before {
  content: ''; position: absolute;
  width: 350px; height: 350px; bottom: -5%; left: -10%;
  background: radial-gradient(circle, rgba(6,182,212,.06) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-b 24s ease-in-out infinite;
  will-change: transform; z-index: 0;
}
#process .container { position: relative; }

/* Tech: Dual orbs */
#tech { overflow: hidden; }
#tech::before {
  content: ''; position: absolute;
  width: 500px; height: 500px; bottom: -10%; left: -10%;
  background: radial-gradient(circle, rgba(124,58,237,.11) 0%, transparent 60%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-b 15s ease-in-out infinite;
  will-change: transform;
}
#tech::after {
  content: ''; position: absolute;
  width: 350px; height: 350px; top: -8%; right: -5%;
  background: radial-gradient(circle, rgba(6,182,212,.09) 0%, transparent 60%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-a 19s ease-in-out infinite;
  will-change: transform;
}

/* Message: Centered warm glow */
#message { overflow: hidden; }
#message::before {
  content: ''; position: absolute;
  width: 500px; height: 500px; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(124,58,237,.1) 0%, rgba(168,85,247,.05) 40%, transparent 65%);
  border-radius: 50%; filter: blur(80px); pointer-events: none;
  animation: orbPulse 10s ease-in-out infinite;
  will-change: opacity;
}

/* FAQ: Subtle bottom orb */
#faq { overflow: hidden; }
#faq::before {
  content: ''; position: absolute;
  width: 400px; height: 400px; bottom: -10%; right: -5%;
  background: radial-gradient(circle, rgba(6,182,212,.08) 0%, transparent 65%);
  border-radius: 50%; filter: blur(60px); pointer-events: none;
  animation: orbFloat-a 17s ease-in-out infinite;
  will-change: transform;
}

/* Orb keyframes */
@keyframes orbFloat-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-20px, 25px) scale(1.05); }
  66% { transform: translate(15px, -15px) scale(.97); }
}
@keyframes orbFloat-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(25px, -20px) scale(1.06); }
}
@keyframes orbPulse {
  0%, 100% { opacity: .6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }
}

/* --- 2. Circuit Grid Lines (Services & Cases) --- */
#services .container::before {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(6,182,212,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6,182,212,.025) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, rgba(0,0,0,.5), transparent);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, rgba(0,0,0,.5), transparent);
}
#services .container { position: relative; }

#cases .container::before {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(124,58,237,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,.02) 1px, transparent 1px);
  background-size: 55px 55px;
  mask-image: radial-gradient(ellipse 70% 40% at 50% 30%, rgba(0,0,0,.4), transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 40% at 50% 30%, rgba(0,0,0,.4), transparent);
}
#cases .container { position: relative; }

/* --- 3. Glowing Section Dividers --- */
.section + .section::after {
  content: ''; position: absolute; top: 0; left: 10%; right: 10%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(124,58,237,.2), rgba(6,182,212,.15), transparent);
  pointer-events: none; z-index: 2;
}
.section + .section-dark::after {
  background: linear-gradient(90deg, transparent, rgba(6,182,212,.15), rgba(124,58,237,.2), transparent);
}

/* --- 4. Dot Matrix (Tech Stack) --- */
#tech .container::after {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image: radial-gradient(rgba(124,58,237,.08) 1px, transparent 1px);
  background-size: 24px 24px;
  mask-image: radial-gradient(ellipse 50% 60% at 50% 50%, rgba(0,0,0,.3), transparent);
  -webkit-mask-image: radial-gradient(ellipse 50% 60% at 50% 50%, rgba(0,0,0,.3), transparent);
}

/* --- 5. Data Stream Lines (Cases section) --- */
#cases::after {
  content: ''; position: absolute;
  top: 0; left: 15%; width: 1px; height: 100%;
  background: linear-gradient(to bottom, transparent 0%, rgba(6,182,212,.06) 20%, transparent 40%, rgba(124,58,237,.04) 60%, transparent 80%);
  pointer-events: none;
  animation: dataStream 8s linear infinite;
  will-change: transform;
}
@keyframes dataStream {
  0% { transform: translateY(-30%); }
  100% { transform: translateY(30%); }
}

/* Additional data stream — different position & speed */
#process::after {
  content: ''; position: absolute;
  top: 0; right: 20%; width: 1px; height: 100%;
  background: linear-gradient(to bottom, transparent 0%, rgba(124,58,237,.04) 30%, transparent 50%, rgba(6,182,212,.03) 70%, transparent 100%);
  pointer-events: none;
  animation: dataStream 12s linear infinite reverse;
  will-change: transform;
}

/* --- Accessibility: Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* --- Mobile: Reduce orb sizes & hide heavy effects --- */
@media (max-width: 768px) {
  #strengths::before, #services::before, #tech::before,
  #process::before, #faq::before, #message::before {
    width: 280px; height: 280px; filter: blur(40px);
  }
  #strengths::after, #services::after, #tech::after,
  #cases::before {
    width: 220px; height: 220px; filter: blur(40px);
  }
  /* Hide grid lines, dot matrix, blueprint on mobile */
  #services .container::before,
  #cases .container::before,
  #tech .container::after,
  .process-timeline::after,
  #process .container::before { display: none; }
  /* Hide data streams on mobile */
  #cases::after, #process::after { display: none; }
  /* Simplify step rings on mobile */
  .step-number::before, .step-number::after { display: none; }
}