/* ============================================================
   Takeover Tide — Website styles
   Brand palette (from ui-design-spec.md §1.2):
   background #0A1628 · primary #00E5FF · secondary #2A6BFF
   tertiary #30E597 (sparingly) · text #F0F4FA
   ============================================================ */

:root {
  --background: #0A1628;
  --surface: #162040;
  --surface-variant: #1A2D50;
  --primary: #00E5FF;
  --secondary: #2A6BFF;
  --tertiary: #30E597;
  --error: #FF4D5E;
  --on-background: #F0F4FA;
  --on-surface-variant: #8899B4;
  --outline: #1E3456;
  --on-primary: #0A1628;
  --max-width: 1120px;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background-color: var(--background);
  color: var(--on-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---------- Layout ---------- */

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

section {
  padding: 88px 0;
}

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--on-surface-variant);
  max-width: 640px;
}

/* ---------- Navigation ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 22, 40, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--outline);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--on-background);
  letter-spacing: -0.01em;
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  color: var(--on-surface-variant);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-links a:hover {
  color: var(--on-background);
  background: var(--surface-variant);
  text-decoration: none;
}

.nav-links a.x-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-cta {
  margin-left: 8px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  border: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.35), 0 4px 24px rgba(0, 229, 255, 0.18);
}

.btn-primary:hover {
  background: #33eaff;
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.5), 0 6px 28px rgba(0, 229, 255, 0.28);
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--outline);
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: rgba(0, 229, 255, 0.06);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 9px 16px;
  font-size: 13px;
}

.btn[disabled] {
  opacity: 0.55;
  cursor: default;
  transform: none;
  box-shadow: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-variant);
  color: var(--on-surface-variant);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge--live {
  color: var(--tertiary);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 120px 0 96px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 520px;
  background:
    radial-gradient(ellipse at 50% 40%, rgba(42, 107, 255, 0.22), transparent 60%),
    radial-gradient(ellipse at 45% 30%, rgba(0, 229, 255, 0.10), transparent 55%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.hero-logo {
  width: 96px;
  height: 96px;
  border-radius: 24px;
  box-shadow: 0 8px 40px rgba(0, 229, 255, 0.25), 0 0 0 1px var(--outline);
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.25rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 0%, #cfe0ff 55%, var(--primary) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero .tagline {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  color: var(--on-surface-variant);
  max-width: 640px;
}

.hero .subcopy {
  max-width: 620px;
  color: var(--on-surface-variant);
  font-size: 1.0625rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 8px;
}

.hero-note {
  font-size: 13px;
  color: var(--on-surface-variant);
}

.hero-note code {
  font-family: var(--mono);
  color: var(--on-background);
  background: var(--surface-variant);
  padding: 2px 6px;
  border-radius: 6px;
}

/* ---------- Stats strip ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 56px;
  width: 100%;
  max-width: 760px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 18px 16px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  font-family: var(--mono);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 13px;
  color: var(--on-surface-variant);
  margin-top: 4px;
}

/* ---------- Tabs (Features) ---------- */

.features {
  background: linear-gradient(180deg, var(--background) 0%, #0d1d36 100%);
  border-top: 1px solid var(--outline);
  border-bottom: 1px solid var(--outline);
}

.tabs {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
}

.tab-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 6px;
}

.tab-button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 12px;
  border-radius: 9px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.tab-button:hover {
  color: var(--on-background);
  background: var(--surface-variant);
}

.tab-button[aria-selected="true"] {
  background: var(--primary);
  color: var(--on-primary);
}

.tab-icon {
  font-size: 18px;
  line-height: 1;
}

.tab-panels {
  margin-top: 20px;
}

.tab-panel {
  display: none;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 36px;
}

.tab-panel[aria-hidden="false"] {
  display: block;
  animation: fade-in 0.25s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.tab-panel h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.tab-panel p {
  color: var(--on-surface-variant);
  max-width: 640px;
  margin-bottom: 14px;
}

.tab-panel .tab-features {
  list-style: none;
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.tab-panel .tab-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--on-background);
}

.tab-panel .tab-features li::before {
  content: "→";
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
}

/* ---------- How it works ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
  counter-reset: step;
}

.step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.step-num {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(0, 229, 255, 0.12);
  color: var(--primary);
  font-size: 18px;
  font-weight: 800;
  font-family: var(--mono);
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  color: var(--on-surface-variant);
  font-size: 15px;
}

/* ---------- Product / About section ---------- */

.product {
  border-top: 1px solid var(--outline);
}

.product-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: start;
  margin-top: 36px;
}

.product-copy p {
  color: var(--on-surface-variant);
  margin-bottom: 14px;
}

.product-copy .disclaimer {
  background: rgba(255, 77, 94, 0.06);
  border: 1px solid rgba(255, 77, 94, 0.25);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--on-surface-variant);
  margin-top: 20px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--radius);
  padding: 28px;
}

.product-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 13px;
}

.data-list {
  list-style: none;
  display: grid;
  gap: 12px;
}

.data-list li {
  display: flex;
  gap: 10px;
  font-size: 14.5px;
  color: var(--on-surface-variant);
}

.data-list li strong {
  color: var(--on-background);
  font-weight: 600;
}

.data-list li::before {
  content: "•";
  color: var(--secondary);
  font-weight: 700;
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--outline);
  padding: 56px 0 40px;
  background: #081222;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 36px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 12px;
}

.footer-brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.footer p {
  color: var(--on-surface-variant);
  font-size: 14px;
  max-width: 320px;
}

.footer h5 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-surface-variant);
  margin-bottom: 14px;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-links a {
  color: var(--on-background);
  font-size: 14px;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

.footer-x {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--on-background);
  font-size: 14px;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 999px;
  padding: 9px 16px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.footer-x:hover {
  border-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding: 24px 24px 0;
  border-top: 1px solid var(--outline);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  color: var(--on-surface-variant);
  font-size: 13px;
}

/* ---------- Legal pages ---------- */

.legal {
  padding: 72px 0 96px;
}

.legal-header {
  margin-bottom: 40px;
}

.legal-header h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.legal-header .updated {
  color: var(--on-surface-variant);
  font-size: 14px;
}

.legal-body {
  max-width: 780px;
  display: grid;
  gap: 28px;
}

.legal-body h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.legal-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--on-background);
}

.legal-body p,
.legal-body li {
  color: var(--on-surface-variant);
  font-size: 15px;
  margin-bottom: 10px;
}

.legal-body ul,
.legal-body ol {
  padding-left: 22px;
  display: grid;
  gap: 6px;
}

.legal-body li {
  margin-bottom: 0;
}

.legal-body code {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--primary);
  background: var(--surface-variant);
  padding: 2px 6px;
  border-radius: 6px;
}

.legal-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 28px;
  font-size: 14px;
  font-weight: 600;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  section { padding: 64px 0; }
  .product-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .tab-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  section { padding: 56px 0; }
  .container { padding: 0 20px; }
  .hero { padding: 88px 0 64px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .stats { grid-template-columns: 1fr; gap: 10px; margin-top: 40px; }
  .tab-list { grid-template-columns: 1fr; }
  .tab-panel { padding: 24px; }
  .steps { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; }
  .nav-links a:not(.nav-cta) { display: none; }
  .nav-inner { padding: 12px 20px; }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .tab-panel[aria-hidden="false"] { animation: none; }
  .btn { transition: none; }
}