/* ======================
   Design System Tokens
   ====================== */
:root {
  --bg: #0E0E1A;
  --surface: #1A1A2E;
  --surface-alt: #16213E;
  --surface-raised: #0F3460;
  --accent: #4ECCA3;
  --accent-hover: #3BA67D;
  --text: #FFFFFF;
  --text-muted: #A0A0A0;
  --error: #E94560;
  --warning: #FFA726;
  --radius: 8px;
  --radius-lg: 12px;
  --max-w: 1120px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

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

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ======================
   Header
   ====================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background 0.3s, box-shadow 0.3s;
}

.site-header.scrolled {
  background: rgba(14, 14, 26, 0.95);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  position: relative;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}

.logo-icon {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
  pointer-events: none;
  line-height: 0;
}

.logo-btc {
  position: relative;
}

.logo-text {
  position: relative;
  z-index: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.lang-switcher {
  display: flex;
  gap: 4px;
  margin-left: 8px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  overflow: hidden;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: inherit;
}

.lang-btn:hover { color: var(--text); }
.lang-btn.active { background: var(--surface-raised); color: var(--text); }

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

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

/* ======================
   Hero
   ====================== */
.hero {
  padding: calc(var(--header-h) + 80px) 0 80px;
  text-align: center;
}

.hero-content { max-width: 680px; margin: 0 auto; }

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero h1 .accent { color: var(--accent); }

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9375rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--surface);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--surface);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: rgba(255,255,255,0.15);
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.3);
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: 12px 16px;
}

.btn-ghost:hover { color: var(--text); }

.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

.hero-mockup {
  margin-top: 64px;
  display: flex;
  justify-content: center;
}

/* ======================
   Phone Mockup (CSS)
   ====================== */
.phone-frame {
  width: 280px;
  border: 2px solid rgba(255,255,255,0.1);
  border-radius: 28px;
  background: var(--surface);
  padding: 12px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4);
}

.phone-screen {
  border-radius: 18px;
  background: var(--surface-alt);
  overflow: hidden;
  padding: 16px;
}

.mock-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.mock-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text);
}

.mock-badge {
  font-size: 0.5rem;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 2px 6px;
}

.mock-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
}

.mock-card-label {
  font-size: 0.5rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.mock-card-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.mock-card-sub {
  font-size: 0.5625rem;
  color: var(--accent);
  margin-top: 2px;
}

.mock-chart {
  height: 60px;
  margin: 12px 0;
  position: relative;
  overflow: hidden;
}

.mock-chart svg {
  width: 100%;
  height: 100%;
}

.mock-plan {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 6px;
}

.mock-plan-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--warning);
  flex-shrink: 0;
}

.mock-plan-info { flex: 1; min-width: 0; }

.mock-plan-name {
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--text);
}

.mock-plan-detail {
  font-size: 0.5rem;
  color: var(--text-muted);
}

.mock-plan-status {
  font-size: 0.5rem;
  font-weight: 600;
  color: var(--accent);
}

.mock-nav {
  display: flex;
  justify-content: space-around;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 10px;
  margin-top: 12px;
}

.mock-nav-item {
  text-align: center;
  font-size: 0.4375rem;
  color: var(--text-muted);
}

.mock-nav-item.active { color: var(--accent); }

.mock-nav-item svg {
  width: 16px;
  height: 16px;
  display: block;
  margin: 0 auto 2px;
}

/* ======================
   Section Shared Styles
   ====================== */
section { padding: 96px 0; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.0625rem;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-alt { background: var(--surface-alt); }

/* ======================
   Value Proposition Cards
   ====================== */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.value-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
}

.value-card .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(78, 204, 163, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.value-card .icon svg { width: 22px; height: 22px; color: var(--accent); }

.value-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.value-card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ======================
   Features Deep Dive
   ====================== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}

.feature-block:last-child { margin-bottom: 0; }
.feature-block.reverse { direction: rtl; }
.feature-block.reverse > * { direction: ltr; }

.feature-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-text p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

/* Strategy cards within features */
.strategy-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.strategy-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.strategy-card .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.strategy-card .dot.green { background: var(--accent); }
.strategy-card .dot.blue { background: #5B8DEF; }
.strategy-card .dot.orange { background: var(--warning); }

.strategy-card-info { flex: 1; }

.strategy-card-info strong {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.strategy-card-info span {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Feature mockup panels */
.feature-visual {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Portfolio mockup */
.mock-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.mock-tab {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 16px;
  border-bottom: 2px solid transparent;
}

.mock-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.mock-stat-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.mock-stat {
  flex: 1;
  text-align: center;
}

.mock-stat-label {
  font-size: 0.625rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mock-stat-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 2px;
}

.mock-stat-value.green { color: var(--accent); }

/* History mockup */
.mock-tx-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.mock-tx-row:last-child { border-bottom: none; }

.mock-tx-left { display: flex; align-items: center; gap: 10px; }

.mock-tx-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(78,204,163,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mock-tx-icon svg { width: 14px; height: 14px; color: var(--accent); }

.mock-tx-pair {
  font-size: 0.75rem;
  font-weight: 600;
}

.mock-tx-date {
  font-size: 0.625rem;
  color: var(--text-muted);
}

.mock-tx-amount {
  font-size: 0.75rem;
  font-weight: 600;
  text-align: right;
}

.mock-tx-fiat {
  font-size: 0.625rem;
  color: var(--text-muted);
}

/* Sandbox mockup */
.mock-sandbox-banner {
  background: rgba(255, 167, 38, 0.1);
  border: 1px solid rgba(255, 167, 38, 0.2);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-size: 0.6875rem;
  color: var(--warning);
  text-align: center;
  font-weight: 600;
  margin-bottom: 16px;
}

.mock-toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.mock-toggle-label {
  font-size: 0.8125rem;
  font-weight: 500;
}

.mock-toggle-desc {
  font-size: 0.6875rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.mock-toggle {
  width: 40px;
  height: 22px;
  border-radius: 11px;
  background: var(--warning);
  position: relative;
  flex-shrink: 0;
}

.mock-toggle::after {
  content: '';
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  position: absolute;
  top: 2px;
  right: 2px;
}

/* Withdrawal / QR mockups */
.mock-address-box {
  background: var(--surface-alt);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 12px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.6875rem;
  color: var(--text-muted);
  word-break: break-all;
  margin-top: 12px;
}

.mock-qr-box {
  width: 120px;
  height: 120px;
  background: white;
  border-radius: var(--radius);
  margin: 20px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.mock-qr-grid {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: repeat(7, 1fr);
  gap: 2px;
}

.mock-qr-cell {
  background: #000;
  border-radius: 1px;
}

.mock-qr-cell.empty { background: transparent; }

/* ======================
   Store Badges
   ====================== */
.store-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.store-badge {
  display: inline-block;
  height: 48px;
  border-radius: 8px;
  transition: opacity 0.2s, transform 0.2s;
}

.store-badge:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.store-badge svg {
  height: 48px;
  width: auto;
  display: block;
}

.store-badge.disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

/* ======================
   Exchanges
   ====================== */
.exchange-logos {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.exchange-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.5;
  transition: opacity 0.3s;
}

.exchange-logo:hover { opacity: 1; }

.exchange-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--text);
  transition: border-color 0.3s;
}

.exchange-icon svg {
  width: 32px;
  height: 32px;
}

.exchange-icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.exchange-logo:hover .exchange-icon { border-color: var(--accent); }

.exchange-name {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ======================
   Security Checklist
   ====================== */
.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.security-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 20px;
}

.security-check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(78, 204, 163, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.security-check svg { width: 12px; height: 12px; color: var(--accent); }

.security-item strong {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.security-item span {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ======================
   How It Works
   ====================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step { text-align: center; }

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ======================
   Download CTA
   ====================== */
.download-section {
  text-align: center;
  padding: 96px 0;
}

.download-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
}

/* ======================
   Footer
   ====================== */
.site-footer {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

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

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

/* ======================
   Scroll Reveal
   ====================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ======================
   Responsive
   ====================== */
@media (max-width: 900px) {
  .value-grid,
  .security-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .hero h1 { font-size: 2.5rem; }
  .section-header h2 { font-size: 1.75rem; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(14, 14, 26, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    transform: translateY(-120%);
    transition: transform 0.3s;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .nav-links.open { transform: translateY(0); }

  .burger { display: flex; }

  .lang-switcher { margin-left: 0; }

  .hero h1 { font-size: 2rem; }

  .exchange-logos { gap: 20px; }

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

/* ======================
   Privacy Page
   ====================== */
.privacy-page {
  padding: calc(var(--header-h) + 48px) 0 96px;
}

.privacy-content {
  max-width: 720px;
  margin: 0 auto;
}

.privacy-content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.privacy-content .updated {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 32px;
}

.privacy-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
}

.privacy-content p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.privacy-content ul {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 16px;
  padding-left: 24px;
}

.privacy-content li { margin-bottom: 6px; }

.privacy-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 40px;
  font-weight: 500;
}