/* ── Tokens: Material Design 3 ── */
:root {
  --primary: #005AC1;
  --on-primary: #ffffff;
  --primary-container: #D8E2FF;
  --on-primary-container: #001A41;
  --secondary: #575E71;
  --on-secondary: #ffffff;
  --secondary-container: #DBE2F9;
  --on-secondary-container: #141B2C;
  --tertiary: #715573;
  --on-tertiary: #ffffff;
  --tertiary-container: #FBD7FC;
  --on-tertiary-container: #29132D;
  --error: #BA1A1A;
  --on-error: #ffffff;
  --outline: #74777F;
  --outline-var: #C4C6D0;
  --surface: #FEFBFF;
  --on-surface: #1B1B1F;
  --surface-container: #F3F3F7;
  --surface-container-low: #F7F6BB; /* Adjusted for contrast */
  --surface-container-high: #ECEBE9;
  --on-surface-var: #44474F;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
  --radius-full: 1000px;

  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Dark Theme Overrides ── */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --primary: #ADC6FF;
    --on-primary: #002E69;
    --primary-container: #004494;
    --on-primary-container: #D8E2FF;
    --secondary: #BFC6DC;
    --on-secondary: #293041;
    --secondary-container: #3F4759;
    --on-secondary-container: #DBE2F9;
    --tertiary: #DEBCDF;
    --on-tertiary: #402843;
    --tertiary-container: #583E5B;
    --on-tertiary-container: #FBD7FC;
    --error: #FFB4AB;
    --on-error: #690005;
    --outline: #8E9099;
    --outline-var: #44474F;
    --surface: #1B1B1F;
    --on-surface: #E3E2E6;
    --surface-container: #222326;
    --on-surface-var: #C4C6D0;
  }
}

[data-theme="light"] {
  /* Keep default light tokens */
}

[data-theme="dark"] {
  --primary: #ADC6FF;
  --on-primary: #002E69;
  --primary-container: #004494;
  --on-primary-container: #D8E2FF;
  --secondary: #BFC6DC;
  --on-secondary: #293041;
  --secondary-container: #3F4759;
  --on-secondary-container: #DBE2F9;
  --tertiary: #DEBCDF;
  --on-tertiary: #402843;
  --tertiary-container: #583E5B;
  --on-tertiary-container: #FBD7FC;
  --error: #FFB4AB;
  --on-error: #690005;
  --outline: #8E9099;
  --outline-var: #44474F;
  --surface: #1B1B1F;
  --on-surface: #E3E2E6;
  --surface-container: #222326;
  --on-surface-var: #C4C6D0;
}

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

body {
  font-family: 'Google Sans', system-ui, -apple-system, sans-serif;
  background: var(--surface);
  color: var(--on-surface);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
  transition: var(--transition);
}

/* ── Typography ── */
h1, h2, h3 {
  font-family: 'Google Sans Display', sans-serif;
  font-weight: 500;
  color: var(--on-surface);
}

p {
  color: var(--on-surface-var);
}

/* ── Nav ── */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(16px, 5vw, 48px);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 100;
  border-bottom: 1px solid var(--outline-var);
  transition: var(--transition);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 500;
  color: var(--on-surface);
  text-decoration: none;
}

.nav-brand img {
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a:not(.btn) {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-surface-var);
  text-decoration: none;
  transition: color 0.2s ease;
  padding: 8px 4px;
}

.nav-links a:not(.btn):hover {
  color: var(--primary);
}

/* ── Nav Actions & Icon Buttons ── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle,
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface-var);
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
  background: var(--surface-container);
  color: var(--on-surface);
}

.theme-toggle .material-symbols-outlined,
.menu-toggle .material-symbols-outlined {
  font-size: 22px;
}

.menu-toggle {
  display: none;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

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

.btn-filled {
  background: var(--primary);
  color: var(--on-primary) !important;
}

.btn-filled:hover {
  box-shadow: 0 4px 12px rgba(0, 90, 193, 0.25);
  transform: translateY(-1px);
}

@media (prefers-color-scheme: dark) {
  .btn-filled:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  }
}

.btn-tonal {
  background: var(--secondary-container);
  color: var(--on-secondary-container) !important;
}

.btn-tonal:hover {
  background: var(--outline-var);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--outline);
  color: var(--on-surface) !important;
}

.btn-outline:hover {
  background: var(--surface-container);
  border-color: var(--primary);
  color: var(--primary) !important;
}

.btn-app {
  padding: 8px 20px;
  font-size: 14px;
}

/* ── Hero ── */
.hero {
  padding: 96px 24px 80px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: radial-gradient(circle at top right, var(--primary-container), transparent 400px),
              radial-gradient(circle at bottom left, var(--tertiary-container), transparent 400px);
}

.app-icon {
  width: 120px;
  height: 120px;
  margin-bottom: 32px;
  border-radius: var(--radius-xl);
  background: #fff;
  padding: 8px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.app-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

h1 {
  font-size: clamp(40px, 8vw, 64px);
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

h1 span {
  color: var(--primary);
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 20px);
  max-width: 640px;
  margin-bottom: 40px;
  line-height: 1.6;
}

/* ── Features ── */
.features-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

h2 {
  font-size: 32px;
  margin-bottom: 16px;
  text-align: center;
}

.section-desc {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--surface-container);
  padding: 32px;
  border-radius: var(--radius-lg);
  transition: var(--transition);
  border: 1px solid transparent;
}

.feature-card:hover {
  background: var(--surface);
  border-color: var(--outline-var);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-container);
  color: var(--on-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 15px;
  line-height: 1.6;
}

/* ── Documentation Layout ── */
.doc-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 24px;
  padding: 24px;
  background: var(--surface-container);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.doc-item-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-container);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.doc-item-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.code-block {
  display: block;
  padding: 16px;
  background: var(--on-surface);
  color: var(--surface);
  border-radius: var(--radius-md);
  font-family: 'Roboto Mono', monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
}

[data-theme="dark"] .code-block {
  background: var(--surface-container-high);
  color: var(--on-surface);
}

/* ── Stepper ── */
.stepper {
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 0;
}

.step {
  display: flex;
  gap: 24px;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: var(--on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.step-content h3 {
  margin-bottom: 8px;
}

/* ── Privacy Layout ── */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 64px 24px;
  flex: 1;
}

.page-label {
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 14px;
  margin-bottom: 8px;
  display: block;
}

.last-updated {
  font-size: 14px;
  margin-bottom: 48px;
}

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

.legal-section h2 {
  font-size: 24px;
  margin-bottom: 16px;
  text-align: left;
}

.legal-section p {
  margin-bottom: 16px;
  line-height: 1.7;
}

.legal-section ul {
  padding-left: 24px;
  margin-bottom: 16px;
}

.legal-section li {
  margin-bottom: 12px;
  line-height: 1.6;
}

.legal-section strong {
  color: var(--on-surface);
}

.highlight-box {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  padding: 24px;
  border-radius: var(--radius-lg);
  margin-bottom: 48px;
}

.highlight-box p {
  color: inherit;
  font-weight: 500;
  margin-bottom: 0;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--outline-var);
  padding: 32px 24px;
  transition: var(--transition);
}

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-surface-var);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ── Utilities ── */
.mt-64 { margin-top: 64px; }
.mb-40 { margin-bottom: 40px; }

/* ── Mobile ── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: var(--surface);
    border-bottom: 1px solid var(--outline-var);
    padding: 16px clamp(16px, 5vw, 48px) 24px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
  }
  .nav-links.show {
    display: flex;
  }
  .nav-links a:not(.btn) {
    width: 100%;
    padding: 10px 4px;
  }
  .nav-links .btn {
    margin-top: 8px;
    align-self: flex-start;
  }
  .menu-toggle { display: flex; }
  nav { position: relative; }
  .hero { padding-top: 48px; }
  h1 { font-size: 40px; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: 16px; text-align: center; }
}