/* ================================================================
   TronLink Official Website — Stylesheet
   Style: Product Launch / Digital Brand / Dark Tech
   ================================================================ */

/* ─────────────────────────────────────────
   CSS Custom Properties
───────────────────────────────────────── */
:root {
  /* Colors */
  --c-bg:           #04080F;
  --c-bg-1:         #070D1A;
  --c-bg-2:         #0A1020;
  --c-bg-card:      rgba(255, 255, 255, 0.04);
  --c-bg-card-h:    rgba(255, 255, 255, 0.07);
  --c-border:       rgba(255, 255, 255, 0.08);
  --c-border-h:     rgba(212, 160, 23, 0.45);

  --c-text:         #EEF2FF;
  --c-text-2:       #8B95A8;
  --c-text-3:       #5A6275;

  --c-accent:       #D4A017;
  --c-accent-dim:   rgba(212, 160, 23, 0.13);
  --c-accent-glow:  rgba(212, 160, 23, 0.32);
  --c-cyan:         #E8C04A;
  --c-cyan-dim:     rgba(232, 192, 74, 0.11);

  --c-white:        #FFFFFF;
  --c-success:      #30D158;
  --c-warning:      #FFD60A;

  /* Typography */
  --font-sans:      'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --nav-h:          72px;
  --section-py:     120px;
  --section-py-sm:  80px;
  --container-max:  1200px;
  --container-px:   clamp(20px, 5vw, 60px);

  /* Radius */
  --r-sm:   8px;
  --r-md:   14px;
  --r-lg:   20px;
  --r-xl:   28px;

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-base:   0.25s ease;
  --t-slow:   0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ─────────────────────────────────────────
   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 {
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol { list-style: none; }

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

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

.section {
  padding: var(--section-py) 0;
}

.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 18px;
  padding: 6px 14px;
  border: 1px solid rgba(212, 160, 23, 0.3);
  border-radius: 100px;
  background: var(--c-accent-dim);
}

.section-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--c-white);
  margin-bottom: 20px;
}

.section-subtitle {
  font-size: clamp(15px, 1.5vw, 18px);
  color: var(--c-text-2);
  max-width: 600px;
  line-height: 1.7;
}

.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }

.accent { color: var(--c-accent); }
.cyan { color: var(--c-cyan); }

/* ─────────────────────────────────────────
   Buttons
───────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 100px;
  transition: background var(--t-base), box-shadow var(--t-base), transform var(--t-fast);
  white-space: nowrap;
}

.btn-primary:hover {
  background: #E8B830;
  box-shadow: 0 8px 32px var(--c-accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--c-text);
  font-size: 15px;
  font-weight: 500;
  padding: 13px 30px;
  border-radius: 100px;
  border: 1px solid var(--c-border);
  transition: border-color var(--t-base), color var(--t-base), transform var(--t-fast);
}

.btn-secondary:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--c-accent);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 8px;
  border: 1px solid var(--c-accent);
  transition: background var(--t-base), color var(--t-base);
}

.btn-outline:hover {
  background: var(--c-accent);
  color: var(--c-white);
}

/* ─────────────────────────────────────────
   Navigation
───────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background var(--t-slow), box-shadow var(--t-slow), backdrop-filter var(--t-slow);
}

.navbar.scrolled {
  background: rgba(4, 8, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--c-border);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: var(--c-accent);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 18px;
  height: 18px;
  stroke: #fff;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
}

.nav-link {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--c-text-2);
  padding: 7px 12px;
  border-radius: 8px;
  transition: color var(--t-base), background var(--t-base);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--c-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.active {
  color: var(--c-accent);
}

/* Mobile toggle button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  border-radius: 8px;
  transition: background var(--t-base);
}

.nav-toggle:hover { background: rgba(255,255,255,0.06); }

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-base), width var(--t-base);
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; width: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ─────────────────────────────────────────
   Hero Section
───────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

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

.hero-bg img {
  width: 100%;
  height: 120%;
  object-fit: cover;
  object-position: center;
  opacity: 0.35;
  will-change: transform;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(4, 8, 15, 0.4) 0%,
    rgba(4, 8, 15, 0.2) 40%,
    rgba(4, 8, 15, 0.7) 80%,
    var(--c-bg) 100%
  );
}

/* Grid pattern overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 160, 23, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 160, 23, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: calc(var(--nav-h) + 60px) var(--container-px) 120px;
  width: 100%;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 28px;
  padding: 7px 16px;
  border: 1px solid rgba(212, 160, 23, 0.35);
  border-radius: 100px;
  background: var(--c-accent-dim);
}

.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.6); }
}

.hero-title {
  font-size: clamp(52px, 8vw, 100px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.04em;
  color: var(--c-white);
  margin-bottom: 30px;
}

.hero-title .line {
  display: block;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-cyan) 60%, #A78BFA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: clamp(16px, 1.8vw, 20px);
  color: var(--c-text-2);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--c-border);
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-badge-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-badge-icon svg {
  width: 16px;
  height: 16px;
  stroke: var(--c-accent);
}

.hero-badge-text {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-2);
}

.hero-badge-text strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--c-text-3);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}

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

/* ─────────────────────────────────────────
   Stats Bar
───────────────────────────────────────── */
.stats-bar {
  background: var(--c-bg-1);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  padding: 40px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.stat-item {
  background: var(--c-bg-1);
  padding: 32px 28px;
  text-align: center;
}

.stat-number {
  font-size: clamp(28px, 3vw, 42px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--c-white);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-number .stat-plus {
  color: var(--c-accent);
}

.stat-label {
  font-size: 13px;
  color: var(--c-text-2);
  font-weight: 400;
}

/* ─────────────────────────────────────────
   Section: Product Capabilities
───────────────────────────────────────── */
.capabilities {
  background: var(--c-bg);
}

.capabilities-intro {
  max-width: 700px;
  margin-bottom: 72px;
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--c-border);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  overflow: hidden;
}

.cap-card {
  background: var(--c-bg-1);
  padding: 40px 36px;
  transition: background var(--t-base);
  cursor: default;
}

.cap-card:hover {
  background: var(--c-bg-2);
}

.cap-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  transition: box-shadow var(--t-base);
}

.cap-card:hover .cap-icon {
  box-shadow: 0 0 20px var(--c-accent-glow);
}

.cap-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--c-accent);
}

.cap-icon.cyan { background: var(--c-cyan-dim); border-color: rgba(0, 212, 255, 0.2); }
.cap-icon.cyan svg { stroke: var(--c-cyan); }

.cap-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.cap-desc {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.7;
}

/* ─────────────────────────────────────────
   Section: Wallet Features
───────────────────────────────────────── */
.features {
  background: var(--c-bg-1);
}

.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 100px;
}

.feature-split:last-child { margin-bottom: 0; }

.feature-split.reverse { direction: rtl; }
.feature-split.reverse > * { direction: ltr; }

.feature-image {
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  position: relative;
}

.feature-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity var(--t-slow), transform var(--t-slow);
}

.feature-image:hover img {
  opacity: 1;
  transform: scale(1.02);
}

.feature-image-glow {
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 60px;
  background: var(--c-accent);
  filter: blur(40px);
  opacity: 0.2;
  border-radius: 50%;
}

.feature-content { }

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 36px;
}

.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-item-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-item-icon svg {
  width: 18px;
  height: 18px;
  stroke: var(--c-accent);
}

.feature-item-body {}

.feature-item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 5px;
}

.feature-item-desc {
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.6;
}

/* ─────────────────────────────────────────
   Section: Download Center
───────────────────────────────────────── */
.download {
  background: var(--c-bg);
  position: relative;
  overflow: hidden;
}

.download::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(212, 160, 23, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.download-header {
  text-align: center;
  margin-bottom: 64px;
}

.platform-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.platform-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 100px;
  border: 1px solid var(--c-border);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  background: transparent;
  transition: all var(--t-base);
}

.platform-tab svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}

.platform-tab:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.platform-tab.active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-white);
}

.platform-panel {
  display: none;
}

.platform-panel.active {
  display: block;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.download-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: border-color var(--t-base), background var(--t-base), transform var(--t-base);
}

.download-card:hover {
  border-color: var(--c-accent);
  background: var(--c-bg-card-h);
  transform: translateY(-2px);
}

.download-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.download-card-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--r-md);
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--c-accent);
}

.download-card-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-white);
}

.download-card-version {
  font-size: 12px;
  color: var(--c-text-3);
  margin-top: 2px;
}

.download-card-desc {
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.65;
  flex: 1;
}

.download-meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--c-text-3);
}

.download-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.download-notice {
  margin-top: 48px;
  text-align: center;
  padding: 24px 32px;
  background: rgba(255, 214, 10, 0.05);
  border: 1px solid rgba(255, 214, 10, 0.15);
  border-radius: var(--r-md);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.65;
}

.download-notice strong {
  color: var(--c-warning);
}

/* ─────────────────────────────────────────
   Section: Security System
───────────────────────────────────────── */
.security {
  background: var(--c-bg-1);
  position: relative;
  overflow: hidden;
}

.security::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(212, 160, 23, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.security-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
  position: relative;
  z-index: 1;
}

.security-image {
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--c-border);
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.security-image img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  opacity: 0.75;
}

.security-content { }

.security-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 40px;
}

.security-item {
  display: flex;
  gap: 20px;
  padding: 28px 24px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: background var(--t-base), border-color var(--t-base);
  align-items: flex-start;
}

.security-item:hover {
  background: var(--c-bg-card);
  border-color: var(--c-border);
}

.security-item-icon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.security-item-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--c-accent);
}

.security-item-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 8px;
}

.security-item-desc {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.65;
}

/* ─────────────────────────────────────────
   Section: Usage Help
───────────────────────────────────────── */
.help {
  background: var(--c-bg);
}

.help-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 60px;
}

.help-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 36px;
  transition: border-color var(--t-base), transform var(--t-base);
}

.help-card:hover {
  border-color: var(--c-border-h);
  transform: translateY(-2px);
}

.help-card-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 14px;
}

.help-card-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.help-card-body {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.75;
}

.help-card-body p + p {
  margin-top: 12px;
}

/* ─────────────────────────────────────────
   Section: FAQ
───────────────────────────────────────── */
.faq {
  background: var(--c-bg-1);
}

.faq-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-item {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg-card);
  transition: border-color var(--t-base);
  overflow: hidden;
}

.faq-item.open {
  border-color: rgba(212, 160, 23, 0.3);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 24px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
  user-select: none;
  transition: color var(--t-base);
}

.faq-question:hover { color: var(--c-white); }
.faq-item.open .faq-question { color: var(--c-white); }

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--t-base), background var(--t-base), transform var(--t-base);
}

.faq-item.open .faq-icon {
  background: var(--c-accent);
  border-color: var(--c-accent);
  transform: rotate(45deg);
}

.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background: var(--c-text-2);
  border-radius: 1px;
  transition: background var(--t-base);
}

.faq-icon-inner {
  position: relative;
  width: 10px;
  height: 10px;
}

.faq-icon-inner::before,
.faq-icon-inner::after {
  content: '';
  position: absolute;
  background: currentColor;
  border-radius: 1px;
}

.faq-icon-inner::before {
  top: 50%;
  left: 0;
  right: 0;
  height: 1.5px;
  transform: translateY(-50%);
}

.faq-icon-inner::after {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1.5px;
  transform: translateX(-50%);
  transition: opacity var(--t-base);
}

.faq-item.open .faq-icon .faq-icon-inner {
  color: white;
}

.faq-item.open .faq-icon .faq-icon-inner::after {
  opacity: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.75;
  border-top: 1px solid var(--c-border);
  padding-top: 18px;
}

/* ─────────────────────────────────────────
   Section: About Platform
───────────────────────────────────────── */
.about {
  background: var(--c-bg);
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 44px;
}

.value-card {
  padding: 24px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition: border-color var(--t-base);
}

.value-card:hover {
  border-color: var(--c-border-h);
}

.value-icon {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--c-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.value-icon svg {
  width: 16px;
  height: 16px;
  stroke: var(--c-accent);
}

.value-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 6px;
}

.value-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.6;
}

.about-visual {
  position: relative;
}

.about-image-wrapper {
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--c-border);
}

.about-image-wrapper img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  opacity: 0.7;
}

.about-badge {
  position: absolute;
  bottom: 28px;
  left: 28px;
  background: rgba(4, 8, 15, 0.88);
  backdrop-filter: blur(20px);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.about-badge-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.about-badge-icon svg {
  width: 18px;
  height: 18px;
  stroke: white;
}

.about-badge-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-white);
}

.about-badge-sub {
  font-size: 12px;
  color: var(--c-text-2);
  margin-top: 2px;
  font-weight: 400;
}

/* ─────────────────────────────────────────
   Section: Contact
───────────────────────────────────────── */
.contact {
  background: var(--c-bg-1);
  border-top: 1px solid var(--c-border);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-info { }

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 40px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-item-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--c-accent-dim);
  border: 1px solid rgba(212, 160, 23, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-item-icon svg {
  width: 18px;
  height: 18px;
  stroke: var(--c-accent);
}

.contact-item-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-3);
  margin-bottom: 5px;
}

.contact-item-value {
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text);
  line-height: 1.5;
}

.contact-collab {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 36px;
}

.contact-collab-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 12px;
}

.contact-collab-desc {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.7;
  margin-bottom: 28px;
}

.collab-types {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.collab-type {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--c-text-2);
}

.collab-type svg {
  width: 16px;
  height: 16px;
  stroke: var(--c-success);
  flex-shrink: 0;
}

/* ─────────────────────────────────────────
   Footer
───────────────────────────────────────── */
.footer {
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  padding: 60px 0 40px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 36px;
}

.footer-brand { }

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-logo .logo-icon {
  width: 32px;
  height: 32px;
}

.footer-brand-desc {
  font-size: 13.5px;
  color: var(--c-text-2);
  line-height: 1.7;
  max-width: 280px;
}

.footer-col-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-3);
  margin-bottom: 16px;
}

.footer-col-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col-links a {
  font-size: 13.5px;
  color: var(--c-text-2);
  transition: color var(--t-base);
}

.footer-col-links a:hover { color: var(--c-text); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 13px;
  color: var(--c-text-3);
}

.footer-legal {
  display: flex;
  gap: 20px;
}

.footer-legal a {
  font-size: 13px;
  color: var(--c-text-3);
  transition: color var(--t-base);
}

.footer-legal a:hover { color: var(--c-text-2); }

/* ─────────────────────────────────────────
   Scroll Reveal Animations
───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.65s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

.stagger-child {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.stagger-child.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────
   Responsive — 1024px
───────────────────────────────────────── */
@media (max-width: 1024px) {
  :root {
    --section-py: 90px;
  }

  .cap-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-split {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .feature-split.reverse { direction: ltr; }

  .security-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .security-image {
    position: static;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

/* ─────────────────────────────────────────
   Responsive — 768px
───────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --section-py: 72px;
    --nav-h: 64px;
  }

  /* Navigation */
  .nav-toggle { display: flex; }

  .nav-menu {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(4, 8, 15, 0.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    padding: 16px 16px 28px;
    border-bottom: 1px solid var(--c-border);
    max-height: calc(100vh - var(--nav-h));
    overflow-y: auto;
  }

  .nav-menu.open { display: flex; }

  .nav-menu li {
    display: block;
    width: 100%;
  }

  .nav-link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 10px;
    color: var(--c-text-2);
    border: 1px solid transparent;
    transition: background var(--t-base), color var(--t-base), border-color var(--t-base);
  }

  .nav-link:hover,
  .nav-link.active {
    background: rgba(212, 160, 23, 0.08);
    color: var(--c-white);
    border-color: rgba(212, 160, 23, 0.18);
  }

  .nav-link.active {
    color: var(--c-accent);
    background: rgba(212, 160, 23, 0.10);
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Capabilities */
  .cap-grid {
    grid-template-columns: 1fr;
  }

  /* Help */
  .help-grid {
    grid-template-columns: 1fr;
  }

  /* About values */
  .about-values {
    grid-template-columns: 1fr;
  }

  /* Download */
  .download-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  /* Hero */
  .hero-badges {
    gap: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-scroll { display: none; }
}

/* ─────────────────────────────────────────
   Responsive — 480px
───────────────────────────────────────── */
@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .feature-image img,
  .security-image img,
  .about-image-wrapper img {
    height: 260px;
  }
}