/* =============================================================
   COINBASE OFFICIAL WEBSITE — style.css
   Design System: Future Architecture Atrium Navigation
   Version: 1.0
   ============================================================= */

/* ── Variables ──────────────────────────────────────────────── */
:root {
  /* Structural depth palette */
  --cv-void:    #080f1c;
  --cv-deep:    #0f1a2e;
  --cv-core:    #162236;
  --cv-mid:     #1e3048;
  --cv-steel:   #2a4a6b;
  --cv-mist:    #4a6a8a;

  /* Surface palette */
  --cv-cold:    #ecf1f6;
  --cv-surface: #f4f7fb;
  --cv-panel:   #f8fafc;
  --cv-white:   #ffffff;

  /* Accent palette */
  --cv-accent:  #2563eb;
  --cv-bright:  #0ea5e9;
  --cv-cyan:    #06b6d4;
  --cv-purple:  #7c3aed;

  /* Text palette */
  --cv-text:    #0f1a2e;
  --cv-sub:     #2a4a6b;
  --cv-muted:   #6b8aaa;
  --cv-ghost:   #a0b8cc;
  --cv-ink:     rgba(255,255,255,0.85);
  --cv-dim:     rgba(255,255,255,0.5);

  /* Border */
  --cv-line:    rgba(42,74,107,0.12);
  --cv-border:  rgba(42,74,107,0.20);
  --cv-edge:    rgba(14,165,233,0.25);

  /* Shadows */
  --shadow-xs:  0 1px 4px rgba(8,15,28,0.06);
  --shadow-sm:  0 2px 10px rgba(8,15,28,0.08);
  --shadow-md:  0 4px 20px rgba(8,15,28,0.10);
  --shadow-lg:  0 8px 40px rgba(8,15,28,0.14);
  --shadow-xl:  0 16px 64px rgba(8,15,28,0.18);

  /* Layout */
  --container:  1240px;
  --nav-h:      64px;

  /* Radius */
  --r-sm:  3px;
  --r-md:  6px;
  --r-lg:  12px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-std:  260ms ease;
  --t-slow: 400ms 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: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', Arial, sans-serif;
  color: var(--cv-text);
  background: var(--cv-white);
  line-height: 1.7;
  overflow-x: hidden;
}

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

/* ── Container ───────────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* ── Arch Badge ──────────────────────────────────────────────── */
.arch-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.arch-badge__code {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--cv-bright);
  font-family: 'Helvetica Neue', monospace;
}
.arch-badge__sep {
  color: var(--cv-muted);
  font-size: 10px;
}
.arch-badge__label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cv-ghost);
}
.arch-badge--light .arch-badge__code { color: var(--cv-accent); }
.arch-badge--light .arch-badge__label { color: var(--cv-muted); }

/* ── Section Header ──────────────────────────────────────────── */
.section-header { margin-bottom: 56px; }

.section-title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
  position: relative;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  color: var(--cv-text);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.section-title--light { color: var(--cv-white); }

.section-num {
  font-size: clamp(72px, 9vw, 120px);
  font-weight: 900;
  color: rgba(42,74,107,0.06);
  line-height: 1;
  letter-spacing: -0.05em;
  flex-shrink: 0;
  margin-bottom: -8px;
  user-select: none;
}
.section-num--ghost { color: rgba(255,255,255,0.04); }

.section-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--cv-sub);
  max-width: 680px;
}
.section-lead--light { color: rgba(255,255,255,0.65); }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all var(--t-std);
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--t-fast);
  background: rgba(255,255,255,0.08);
}
.btn:hover::before { opacity: 1; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--cv-accent);
  color: var(--cv-white);
  box-shadow: 0 4px 20px rgba(37,99,235,0.35);
}
.btn--primary:hover {
  background: #1d4ed8;
  box-shadow: 0 6px 28px rgba(37,99,235,0.45);
  transform: translateY(-1px);
}

.btn--ghost {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.9);
  border: 1px solid rgba(255,255,255,0.2);
  backdrop-filter: blur(4px);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.35);
  transform: translateY(-1px);
}

.btn-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  filter: brightness(10);
}

/* ── HEADER / NAV ────────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: var(--nav-h);
  background: rgba(8,15,28,0.92);
  backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid rgba(14,165,233,0.12);
  transition: background var(--t-std), border-color var(--t-std);
}
.site-header.scrolled {
  background: rgba(8,15,28,0.97);
  border-bottom-color: rgba(14,165,233,0.18);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.nav-logo__mark {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  background: var(--cv-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 800;
  color: white;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(37,99,235,0.4);
}
.nav-logo__word {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: rgba(255,255,255,0.9);
  text-transform: uppercase;
}

/* Nav items */
.nav-guide { margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-item {
  display: flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--r-sm);
  transition: background var(--t-fast), color var(--t-fast);
  white-space: nowrap;
}
.nav-item__name {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.55);
  transition: color var(--t-fast);
}
.nav-item:hover .nav-item__name { color: rgba(255,255,255,0.9); }
.nav-item.active .nav-item__name { color: rgba(255,255,255,0.95); }
.nav-item.active { background: rgba(14,165,233,0.1); }
.nav-item--cta {
  background: rgba(37,99,235,0.15);
  border: 1px solid rgba(37,99,235,0.3);
  margin-left: 8px;
}
.nav-item--cta .nav-item__name { color: rgba(14,165,233,0.9); }
.nav-item--cta:hover { background: rgba(37,99,235,0.25); }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  margin-left: auto;
}
.toggle-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: rgba(255,255,255,0.7);
  border-radius: 1px;
  transition: transform var(--t-std), opacity var(--t-fast), width var(--t-fast);
  transform-origin: left center;
}
.nav-toggle.open .toggle-line:nth-child(1) { transform: rotate(38deg) translateY(-1px); }
.nav-toggle.open .toggle-line:nth-child(2) { opacity: 0; width: 60%; }
.nav-toggle.open .toggle-line:nth-child(3) { transform: rotate(-38deg) translateY(1px); }

/* Mobile nav panel */
.nav-mobile {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: var(--cv-void);
  border-bottom: 1px solid rgba(14,165,233,0.15);
  padding: 16px 0 24px;
  transform: translateY(-4px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--t-std), opacity var(--t-std);
  z-index: 890;
}
.nav-mobile.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.nav-mobile__header {
  padding: 12px 40px;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  margin-bottom: 8px;
}
.nav-mobile__title {
  font-size: 10px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(14,165,233,0.6);
  font-weight: 600;
}
.nav-mobile__list { padding: 0 40px; }
.nav-mobile__item {
  display: flex;
  align-items: center;
  padding: 15px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: color var(--t-fast);
}
.nm-name {
  font-size: 15px;
  color: rgba(255,255,255,0.7);
  font-weight: 500;
  transition: color var(--t-fast);
}
.nav-mobile__item:hover .nm-name { color: var(--cv-white); }

/* ── Side Indicator ──────────────────────────────────────────── */
.side-indicator {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 800;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.si-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.15);
  transition: all var(--t-std);
  display: block;
}
.si-dot:hover, .si-dot.active {
  background: var(--cv-bright);
  border-color: var(--cv-bright);
  box-shadow: 0 0 8px rgba(14,165,233,0.6);
}
.si-dot.active { width: 8px; height: 8px; margin: -1px; }

/* ── Reveal Animation ────────────────────────────────────────── */
.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── G01 ENTRANCE ────────────────────────────────────────────── */
.s-entrance {
  position: relative;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(8,15,28,0.90) 0%, rgba(15,26,46,0.86) 100%),
    url('assets/images/hero-bg.jpg') center / cover no-repeat;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-h) + 60px) 0 80px;
  overflow: hidden;
}

/* Architectural grid overlay */
.entrance-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

/* Vertical accent lines */
.entrance-vlines {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}
.entrance-vlines span {
  width: 1px;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(14,165,233,0.08) 30%,
    rgba(14,165,233,0.12) 50%,
    rgba(14,165,233,0.08) 70%,
    transparent 100%
  );
}

/* Glow at top */
.s-entrance::before {
  content: '';
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(37,99,235,0.12) 0%, transparent 65%);
  pointer-events: none;
}

/* Glow at bottom */
.s-entrance::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, rgba(8,15,28,0.6));
  pointer-events: none;
}

/* Architectural reference marks */
.arch-ref {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 2;
}
.arch-ref--tl { top: calc(var(--nav-h) + 20px); left: 40px; }
.arch-ref--tr { top: calc(var(--nav-h) + 20px); right: 40px; flex-direction: row-reverse; }
.arch-ref--bl { bottom: 30px; left: 40px; }
.ref-cross {
  font-size: 14px;
  color: rgba(14,165,233,0.4);
  font-weight: 300;
  line-height: 1;
}
.ref-label {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: rgba(14,165,233,0.3);
  font-family: monospace;
  font-weight: 500;
}

.entrance-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 60px;
  position: relative;
  z-index: 2;
}

.entrance-content { }

.arch-badge .arch-badge__code { font-size: 10px; }
.arch-badge .arch-badge__label { font-size: 9px; }

.entrance-title {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 20px 0 28px;
}
/* SEO核心词标签 — coinbase 官网 */
.entrance-title__kw {
  font-size: clamp(13px, 1.4vw, 17px);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cv-bright);
  line-height: 1;
  opacity: 0.9;
}
/* 主视觉大标题 — 价值主张 */
.entrance-title__main {
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(135deg, #ffffff 0%, rgba(14,165,233,0.85) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
/* 副标题 — 含 coinbase下载 副核心词 */
.entrance-title__sub {
  font-size: clamp(13px, 1.4vw, 16px);
  font-weight: 400;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.05em;
  line-height: 1.5;
}

.entrance-desc {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255,255,255,0.55);
  max-width: 520px;
  margin-bottom: 36px;
}

.entrance-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.entrance-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.07);
}
.meta-item {
  font-size: 11px;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.06em;
  font-family: monospace;
}
.meta-sep { color: rgba(14,165,233,0.3); font-size: 10px; }

.entrance-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-real-img {
  width: 100%;
  max-width: 520px;
  border-radius: 8px;
  border: 1px solid rgba(14,165,233,0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(14,165,233,0.1);
  object-fit: cover;
  aspect-ratio: 4/3;
}

/* Floor tag */
.floor-tag {
  position: absolute;
  bottom: 0;
  right: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 0;
}
.floor-tag__level {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: rgba(14,165,233,0.5);
  font-family: monospace;
}
.floor-tag__sep { color: rgba(255,255,255,0.15); font-size: 10px; }
.floor-tag__name {
  font-size: 9px;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.2);
  text-transform: uppercase;
}

/* ── G02 BRAND ───────────────────────────────────────────────── */
.s-brand {
  padding: 100px 0;
  background: var(--cv-white);
  position: relative;
}
.s-brand::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--cv-accent), var(--cv-bright), var(--cv-cyan));
}

.brand-layout {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 64px;
  align-items: start;
  margin-bottom: 64px;
}
.brand-intro__lead {
  font-size: 20px;
  font-weight: 600;
  color: var(--cv-text);
  line-height: 1.6;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}
.brand-intro__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--cv-sub);
  margin-bottom: 16px;
}

.brand-stats {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-panel {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 24px;
  background: var(--cv-surface);
  border-left: 3px solid var(--cv-accent);
  position: relative;
}
.stat-panel::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, var(--cv-accent), transparent);
  opacity: 0.3;
}
.stat-num {
  font-size: 22px;
  font-weight: 800;
  color: var(--cv-accent);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cv-text);
}
.stat-desc {
  font-size: 13px;
  color: var(--cv-muted);
  line-height: 1.6;
}

.brand-pillars {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 24px;
}
.pillar-card {
  padding: 32px 28px;
  border: 1px solid var(--cv-line);
  position: relative;
  transition: border-color var(--t-std), box-shadow var(--t-std), transform var(--t-std);
}
.pillar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--cv-bright), var(--cv-cyan));
  opacity: 0;
  transition: opacity var(--t-std);
}
.pillar-card:hover {
  border-color: var(--cv-edge);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.pillar-card:hover::before { opacity: 1; }
.pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: rgba(37,99,235,0.07);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--cv-accent);
}
.pillar-icon img { color: var(--cv-accent); filter: invert(38%) sepia(91%) saturate(749%) hue-rotate(196deg) brightness(95%); }
.pillar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 12px;
}
.pillar-desc {
  font-size: 14px;
  color: var(--cv-sub);
  line-height: 1.75;
}

/* ── G03 SERVICE ─────────────────────────────────────────────── */
.s-service {
  padding: 100px 0;
  background:
    linear-gradient(170deg, rgba(15,26,46,0.95) 0%, rgba(22,34,54,0.93) 100%),
    url('assets/images/brand-bg.jpg') center / cover no-repeat;
  position: relative;
  overflow: hidden;
}
.s-service::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.service-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 2px;
}
.exhibit-panel {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(14,165,233,0.1);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: background var(--t-std), border-color var(--t-std);
}
.exhibit-panel::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, rgba(14,165,233,0.4), transparent);
  opacity: 0;
  transition: opacity var(--t-std);
}
.exhibit-panel:hover {
  background: rgba(14,165,233,0.05);
  border-color: rgba(14,165,233,0.22);
}
.exhibit-panel:hover::after { opacity: 1; }
.exhibit-panel--wide {
  grid-column: span 2;
  flex-direction: row;
  gap: 28px;
  align-items: flex-start;
}
.exhibit-panel__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: rgba(14,165,233,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--cv-bright);
}
.exhibit-panel__icon img { filter: invert(62%) sepia(82%) saturate(1042%) hue-rotate(170deg) brightness(100%); }
.exhibit-panel__content { flex: 1; }
.exhibit-panel__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--cv-white);
  margin-bottom: 10px;
  line-height: 1.3;
}
.exhibit-panel__desc {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.75;
}
.exhibit-panel__tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: rgba(14,165,233,0.6);
  font-family: monospace;
  border: 1px solid rgba(14,165,233,0.2);
  padding: 3px 8px;
  border-radius: 2px;
}

/* ── G04 DOWNLOAD ────────────────────────────────────────────── */
.s-download {
  padding: 100px 0;
  background: var(--cv-white);
  position: relative;
}
.s-download::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(to right, var(--cv-cyan), var(--cv-accent));
}

.download-layout { margin-bottom: 64px; }
.download-intro { margin-bottom: 36px; }
.download-intro__text {
  font-size: 16px;
  color: var(--cv-sub);
  line-height: 1.85;
  max-width: 680px;
  margin-bottom: 20px;
}
.download-notice {
  display: inline-flex;
}
.notice-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(37,99,235,0.06);
  border: 1px solid rgba(37,99,235,0.15);
  border-left: 3px solid var(--cv-accent);
  padding: 12px 16px;
  border-radius: var(--r-sm);
}
.notice-bar img { filter: invert(38%) sepia(91%) saturate(749%) hue-rotate(196deg) brightness(95%); flex-shrink: 0; }
.notice-bar span { font-size: 13px; color: var(--cv-sub); font-weight: 500; }

.platform-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 24px;
}
.platform-card {
  display: flex;
  gap: 20px;
  padding: 28px 24px;
  border: 1px solid var(--cv-line);
  border-radius: var(--r-md);
  transition: border-color var(--t-std), box-shadow var(--t-std), transform var(--t-std);
  position: relative;
  overflow: hidden;
}
.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(to bottom, var(--cv-accent), var(--cv-bright));
  opacity: 0;
  transition: opacity var(--t-std);
}
.platform-card:hover {
  border-color: var(--cv-edge);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.platform-card:hover::before { opacity: 1; }
.platform-card__icon { flex-shrink: 0; }
.platform-card__info { flex: 1; }
.platform-card__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 8px;
}
.platform-card__desc {
  font-size: 13px;
  color: var(--cv-sub);
  line-height: 1.7;
  margin-bottom: 12px;
}
.platform-card__badge {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--cv-accent);
  background: rgba(37,99,235,0.06);
  border: 1px solid rgba(37,99,235,0.15);
  padding: 3px 8px;
  border-radius: 2px;
}

.install-guide {
  background: var(--cv-surface);
  border: 1px solid var(--cv-line);
  padding: 40px 48px;
  position: relative;
}
.install-guide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--cv-bright), transparent);
}
.install-guide__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.install-guide__title::before {
  content: '·';
  color: var(--cv-bright);
  font-size: 24px;
  line-height: 1;
}
.install-steps {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 24px 48px;
}
.install-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.step-num {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--cv-bright);
  width: 28px;
  flex-shrink: 0;
  padding-top: 2px;
  font-family: monospace;
}
.step-content strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 6px;
}
.step-content p {
  font-size: 13px;
  color: var(--cv-sub);
  line-height: 1.7;
}

/* ── G05 PLATFORM ────────────────────────────────────────────── */
.s-platform {
  padding: 100px 0;
  background: var(--cv-panel);
  position: relative;
}

.platform-primary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 48px;
  background: var(--cv-white);
  border: 1px solid var(--cv-line);
  padding: 48px;
  position: relative;
}
.platform-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--cv-accent), var(--cv-bright));
}

.pf-visual {
  border: 1px solid rgba(42,74,107,0.1);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--cv-deep);
}
.pf-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cv-bright);
  background: rgba(14,165,233,0.08);
  border: 1px solid rgba(14,165,233,0.2);
  padding: 4px 10px;
  border-radius: 2px;
  margin-bottom: 16px;
}
.pf-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--cv-text);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}
.pf-desc {
  font-size: 14px;
  color: var(--cv-sub);
  line-height: 1.8;
  margin-bottom: 12px;
}
.pf-checklist {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pf-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--cv-sub);
  line-height: 1.5;
}
.pf-checklist li img {
  flex-shrink: 0;
  filter: invert(38%) sepia(91%) saturate(749%) hue-rotate(196deg) brightness(95%);
  margin-top: 1px;
}

.platform-secondary {
  display: grid;
  grid-template-columns: repeat(5,1fr);
  gap: 2px;
}
.func-card {
  background: var(--cv-white);
  border: 1px solid var(--cv-line);
  padding: 28px 24px;
  position: relative;
  transition: border-color var(--t-std), box-shadow var(--t-std), transform var(--t-std);
}
.func-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--cv-accent), var(--cv-bright));
  opacity: 0;
  transition: opacity var(--t-std);
}
.func-card:hover {
  border-color: var(--cv-edge);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  z-index: 1;
}
.func-card:hover::after { opacity: 1; }
.func-card__num {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: rgba(37,99,235,0.3);
  font-family: monospace;
  margin-bottom: 12px;
}
.func-card__icon {
  margin-bottom: 14px;
  color: var(--cv-accent);
  filter: invert(38%) sepia(91%) saturate(749%) hue-rotate(196deg) brightness(95%);
}
.func-card__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 8px;
}
.func-card__desc {
  font-size: 12px;
  color: var(--cv-sub);
  line-height: 1.7;
}

/* ── G06 SECURITY ────────────────────────────────────────────── */
.s-security {
  padding: 100px 0;
  background:
    linear-gradient(160deg, rgba(22,34,54,0.94) 0%, rgba(30,48,72,0.92) 100%),
    url('assets/images/security-center.jpg') center / cover no-repeat;
  position: relative;
  overflow: hidden;
}
.s-security::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}
.s-security::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--cv-bright), transparent);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 2px;
}
.security-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(14,165,233,0.1);
  padding: 36px 32px;
  position: relative;
  transition: background var(--t-std), border-color var(--t-std);
}
.security-card:hover {
  background: rgba(14,165,233,0.05);
  border-color: rgba(14,165,233,0.25);
}
.security-card--accent {
  background: rgba(14,165,233,0.06);
  border-color: rgba(14,165,233,0.2);
}
.security-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}
.security-card__header img {
  filter: invert(62%) sepia(82%) saturate(1042%) hue-rotate(170deg) brightness(100%);
}
.security-card__index {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: rgba(14,165,233,0.4);
  font-family: monospace;
}
.security-card__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--cv-white);
  margin-bottom: 12px;
}
.security-card__desc {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  line-height: 1.75;
}

/* ── G07 GUIDE ───────────────────────────────────────────────── */
.s-guide {
  padding: 100px 0;
  background: var(--cv-white);
  position: relative;
}

.guide-panels {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 2px;
}
.guide-panel {
  background: var(--cv-surface);
  border: 1px solid var(--cv-line);
  padding: 32px 36px;
  position: relative;
  transition: border-color var(--t-std), background var(--t-std);
}
.guide-panel::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cv-accent), var(--cv-bright));
  opacity: 0;
  transition: opacity var(--t-std);
}
.guide-panel:hover {
  border-color: var(--cv-edge);
  background: rgba(14,165,233,0.02);
}
.guide-panel:hover::before { opacity: 1; }
.guide-panel__label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cv-bright);
  font-family: monospace;
  margin-bottom: 12px;
}
.guide-panel__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--cv-text);
  margin-bottom: 14px;
  line-height: 1.3;
}
.guide-panel__body {
  font-size: 14px;
  color: var(--cv-sub);
  line-height: 1.8;
}
.guide-panel__body strong { color: var(--cv-text); font-weight: 700; }

/* ── G08 FAQ ─────────────────────────────────────────────────── */
.s-faq {
  padding: 100px 0;
  background: var(--cv-surface);
  position: relative;
}

.faq-list {
  border: 1px solid var(--cv-line);
  overflow: hidden;
}
.faq-item {
  border-bottom: 1px solid var(--cv-line);
  position: relative;
}
.faq-item:last-child { border-bottom: none; }

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 32px;
  text-align: left;
  transition: background var(--t-fast);
  position: relative;
}
.faq-q::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cv-bright);
  opacity: 0;
  transition: opacity var(--t-fast);
}
.faq-q:hover { background: rgba(37,99,235,0.03); }
.faq-q:hover::before { opacity: 1; }
.faq-item.open .faq-q { background: rgba(37,99,235,0.04); }
.faq-item.open .faq-q::before { opacity: 1; }

.faq-q__num {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--cv-bright);
  font-family: monospace;
  flex-shrink: 0;
  width: 48px;
}
.faq-q__text {
  flex: 1;
  font-size: 15px;
  font-weight: 600;
  color: var(--cv-text);
  line-height: 1.4;
}
.faq-q__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
  border: 1px solid var(--cv-border);
  border-radius: 50%;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.faq-q__icon::before,
.faq-q__icon::after {
  content: '';
  position: absolute;
  background: var(--cv-muted);
  border-radius: 1px;
  transition: transform var(--t-std), opacity var(--t-fast), background var(--t-fast);
}
.faq-q__icon::before {
  width: 8px; height: 1.5px;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
}
.faq-q__icon::after {
  width: 1.5px; height: 8px;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
}
.faq-item.open .faq-q__icon {
  border-color: var(--cv-bright);
  background: rgba(14,165,233,0.08);
}
.faq-item.open .faq-q__icon::before,
.faq-item.open .faq-q__icon::after { background: var(--cv-bright); }
.faq-item.open .faq-q__icon::after { transform: translate(-50%,-50%) rotate(90deg); opacity: 0; }

/* Ensure hidden attribute is respected before JS toggle */
[hidden] { display: none !important; }

.faq-a {
  padding: 0 32px 24px calc(32px + 48px + 20px);
  font-size: 14px;
  color: var(--cv-sub);
  line-height: 1.85;
  border-top: 1px solid var(--cv-line);
  padding-top: 20px;
}
.faq-a p { margin: 0; }
.faq-a strong { color: var(--cv-text); font-weight: 700; }

/* ── G09 CONTACT ─────────────────────────────────────────────── */
.s-contact {
  background:
    linear-gradient(160deg, rgba(8,15,28,0.96) 0%, rgba(12,18,32,0.97) 100%),
    url('assets/images/platform-scene.jpg') center / cover no-repeat;
  position: relative;
}
.s-contact > .container { padding-top: 100px; padding-bottom: 80px; }
.s-contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--cv-accent), transparent);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
  padding-top: 8px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.contact-block {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.contact-block:first-child { padding-top: 0; }
.contact-block > img {
  flex-shrink: 0;
  filter: invert(62%) sepia(82%) saturate(1042%) hue-rotate(170deg) brightness(100%);
  margin-top: 2px;
}
.cb-label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cv-ghost);
  margin-bottom: 4px;
  font-weight: 500;
}
.cb-value {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.75);
  font-weight: 500;
  line-height: 1.5;
  transition: color var(--t-fast);
}
a.cb-value:hover { color: var(--cv-bright); }

.contact-about__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--cv-white);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.contact-about__body {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.85;
  margin-bottom: 16px;
}
.contact-about__official {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: rgba(14,165,233,0.06);
  border: 1px solid rgba(14,165,233,0.15);
  border-left: 3px solid var(--cv-bright);
  margin-top: 24px;
}
.co-label {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cv-ghost);
  font-weight: 500;
}
.co-url {
  font-size: 14px;
  color: var(--cv-bright);
  font-weight: 600;
  font-family: monospace;
}

/* Contact footer bar */
.contact-footer {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 28px 0;
}
.cf-row {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}
.cf-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.cf-brand__mark {
  width: 26px;
  height: 26px;
  background: var(--cv-accent);
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: white;
}
.cf-brand__name {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255,255,255,0.5);
}
.cf-copy {
  flex: 1;
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  line-height: 1.6;
}
.cf-links {
  display: flex;
  align-items: center;
  gap: 20px;
}
.cf-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  transition: color var(--t-fast);
}
.cf-links a:hover { color: var(--cv-bright); }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1080px) {
  .nav-guide { display: none; }
  .nav-toggle { display: flex; }
  .entrance-inner { grid-template-columns: 1fr; }
  .entrance-visual { max-width: 400px; margin: 0 auto; }
  .brand-layout { grid-template-columns: 1fr; gap: 40px; }
  .brand-pillars { grid-template-columns: repeat(2,1fr); }
  .service-wall { grid-template-columns: repeat(2,1fr); }
  .exhibit-panel--wide { grid-column: span 2; }
  .platform-grid { grid-template-columns: repeat(2,1fr); }
  .platform-primary { grid-template-columns: 1fr; }
  .pf-visual { order: -1; }
  .platform-secondary { grid-template-columns: repeat(3,1fr); }
  .security-grid { grid-template-columns: repeat(2,1fr); }
  .guide-panels { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; gap: 48px; }
  .side-indicator { display: none; }
}

@media (max-width: 768px) {
  .container { padding: 0 24px; }
  .s-entrance,
  .s-brand,
  .s-service,
  .s-download,
  .s-platform,
  .s-security,
  .s-guide,
  .s-faq,
  .s-contact > .container { padding: 72px 0; }
  .section-header { margin-bottom: 36px; }
  .brand-pillars { grid-template-columns: 1fr; }
  .service-wall { grid-template-columns: 1fr; }
  .exhibit-panel--wide { grid-column: span 1; flex-direction: column; }
  .platform-grid { grid-template-columns: 1fr; }
  .install-steps { grid-template-columns: 1fr; }
  .platform-secondary { grid-template-columns: repeat(2,1fr); }
  .security-grid { grid-template-columns: 1fr; }
  .faq-q { padding: 20px 20px; gap: 14px; }
  .faq-q__num { width: 36px; }
  .faq-a { padding: 16px 20px 20px 20px; }
  .cf-row { flex-direction: column; align-items: flex-start; gap: 16px; }
  .arch-ref { display: none; }
  .entrance-actions { flex-direction: column; align-items: flex-start; }
  .entrance-visual { display: none; }
  .nav-mobile__list,
  .nav-mobile__header { padding: 0 24px; }
}

@media (max-width: 480px) {
  .platform-secondary { grid-template-columns: 1fr; }
  .stat-panel { padding: 16px 20px; }
}