/* BusAhead — Material 3 Expressive
   Default green seed #009356 — ColorScheme.fromSeed (Flutter) */

:root {
  /* Light scheme — seed=#009356 */
  --md-primary: #2C6A46;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #B0F1C3;
  --md-on-primary-container: #0E512F;

  --md-secondary: #4F6354;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #D1E8D5;
  --md-on-secondary-container: #374B3D;

  --md-tertiary: #3B6470;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #BEEAF7;
  --md-on-tertiary-container: #214C57;

  --md-surface: #F6FBF3;
  --md-surface-container-low: #F0F5EE;
  --md-surface-container: #EAEFE8;
  --md-surface-container-high: #E5EAE2;
  --md-surface-container-highest: #DFE4DD;
  --md-on-surface: #181D19;
  --md-on-surface-variant: #414942;
  --md-outline: #717971;
  --md-outline-variant: #C0C9C0;

  /* Expressive shape scale */
  --shape-xl: 32px;
  --shape-l: 24px;
  --shape-m: 20px;
  --shape-full: 9999px;

  --font-body: 'Roboto', system-ui, sans-serif;
  --font-mono: 'Share Tech Mono', monospace;

  --max-width: 1120px;
  --top-bar-height: 64px;
}

[data-theme="dark"] {
  /* Dark scheme — seed=#009356 */
  --md-primary: #94D5A8;
  --md-on-primary: #00391E;
  --md-primary-container: #0E512F;
  --md-on-primary-container: #B0F1C3;

  --md-secondary: #B6CCB9;
  --md-on-secondary: #213527;
  --md-secondary-container: #374B3D;
  --md-on-secondary-container: #D1E8D5;

  --md-tertiary: #A3CDDB;
  --md-on-tertiary: #023640;
  --md-tertiary-container: #214C57;
  --md-on-tertiary-container: #BEEAF7;

  --md-surface: #0F1511;
  --md-surface-container-low: #181D19;
  --md-surface-container: #1C211D;
  --md-surface-container-high: #262B27;
  --md-surface-container-highest: #313631;
  --md-on-surface: #DFE4DD;
  --md-on-surface-variant: #C0C9C0;
  --md-outline: #8A938B;
  --md-outline-variant: #414942;
}

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

html {
  scroll-behavior: smooth;
}

#features,
#faq,
#download {
  scroll-margin-top: calc(var(--top-bar-height) + 16px);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--md-on-surface);
  background: var(--md-surface);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s, color 0.2s;
}

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

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100% - 32px, var(--max-width));
  margin-inline: auto;
}

/* ---- M3 type scale (Material Design 3 default) ---- */
.display-large {
  font-size: 2.8125rem; /* 45px — Display Medium */
  font-weight: 400;
  line-height: 3.25rem; /* 52px */
  letter-spacing: 0;
}

@media (min-width: 600px) {
  .display-large {
    font-size: 3.5625rem; /* 57px — Display Large */
    line-height: 4rem; /* 64px */
    letter-spacing: -0.25px;
  }
}

.display-small {
  font-size: 2.25rem; /* 36px */
  font-weight: 400;
  line-height: 2.75rem; /* 44px */
  letter-spacing: 0;
}

.headline-medium {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 500;
  line-height: 1.2;
}

.headline-small {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.25;
}

.title-large {
  font-size: 1.375rem;
  font-weight: 500;
  line-height: 1.27;
}

.title-medium {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.title-small {
  font-size: 0.875rem;
  font-weight: 500;
}

.body-large {
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0.01em;
}

.body-medium {
  font-size: 0.9375rem;
  font-weight: 400;
  line-height: 1.5;
}

.label-large {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.label-medium {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--md-on-surface-variant);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 200;
  padding: 8px 16px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border-radius: var(--shape-m);
  font-weight: 500;
}

.skip-link:focus {
  top: 16px;
}

/* ---- Tonal surface utilities ---- */
.tone-primary { background: var(--md-primary); color: var(--md-on-primary); }
.tone-primary-container { background: var(--md-primary-container); color: var(--md-on-primary-container); }
.tone-secondary { background: var(--md-secondary); color: var(--md-on-secondary); }
.tone-secondary-container { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.tone-tertiary { background: var(--md-tertiary); color: var(--md-on-tertiary); }
.tone-tertiary-container { background: var(--md-tertiary-container); color: var(--md-on-tertiary-container); }

/* ---- Top app bar ---- */
.top-app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--top-bar-height);
  background: var(--md-surface);
  border-bottom: 1px solid var(--md-outline-variant);
}

.top-app-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.top-app-bar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--md-on-surface);
  font-weight: 500;
  font-size: 1.125rem;
}

.top-app-bar__brand:hover {
  text-decoration: none;
  opacity: 0.85;
}

.top-app-bar__brand img {
  border-radius: 12px;
}

.top-app-bar__nav {
  display: flex;
  gap: 8px;
}

.top-app-bar__nav a {
  padding: 8px 16px;
  border-radius: var(--shape-full);
  color: var(--md-on-surface-variant);
  font-size: 0.875rem;
  font-weight: 500;
}

.top-app-bar__nav a:hover {
  color: var(--md-on-surface);
  background: var(--md-surface-container-high);
  text-decoration: none;
}

.menu-btn {
  display: none !important;
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  background: var(--md-surface-container-low);
  border-bottom: 1px solid var(--md-outline-variant);
}

.drawer-nav[hidden] {
  display: none;
}

.drawer-nav a {
  padding: 16px;
  color: var(--md-on-surface);
  font-weight: 500;
  border-bottom: 1px solid var(--md-outline-variant);
}

.drawer-nav a:last-child {
  border-bottom: none;
}

/* ---- Buttons (M3 pill) ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  border: none;
  border-radius: var(--shape-full);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: filter 0.15s, box-shadow 0.15s, transform 0.12s;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn .material-symbols-outlined {
  font-size: 20px;
}

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

.btn--filled:hover {
  filter: brightness(1.08);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
}

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

.btn--tonal:hover {
  filter: brightness(0.97);
}

/* Icon button */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: var(--shape-full);
  background: transparent;
  color: var(--md-on-surface);
  cursor: pointer;
}

.icon-btn:hover {
  background: var(--md-surface-container-high);
}

/* ---- Hero (colour-drenched primary container) ---- */
.hero {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 48px 0 56px;
  border-bottom-left-radius: var(--shape-xl);
  border-bottom-right-radius: var(--shape-xl);
}

.hero__layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 32px;
  align-items: center;
}

.hero__label {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--shape-full);
  background: color-mix(in srgb, var(--md-on-primary-container) 16%, transparent);
  color: var(--md-on-primary-container);
  margin-bottom: 20px;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero__body {
  max-width: 34rem;
  margin-bottom: 32px;
  opacity: 0.92;
}

.store-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.store-badge {
  display: flex;
  align-items: center;
  height: 40px;
  line-height: 0;
  transition: opacity 0.15s ease, transform 0.12s ease;
}

.store-badge:hover {
  opacity: 0.88;
}

.store-badge:active {
  transform: scale(0.97);
}

.store-badge img {
  display: block;
  height: 40px;
  width: auto;
}

/* Google asset includes transparent padding; scale up to match App Store visual size */
.store-badge--play img {
  height: 60px;
}

.hero__devices {
  display: flex;
  gap: clamp(16px, 4vw, 32px);
  align-items: flex-end;
  justify-content: center;
  margin: 0;
}

.hero__device {
  flex: 0 1 auto;
  text-align: center;
}

/* Each mockup keeps its own aspect ratio; cap height so they sit level at the bottom. */
.hero__device img {
  display: block;
  width: auto;
  height: auto;
  max-height: min(380px, 50vh);
  max-width: 100%;
  margin-inline: auto;
  border-radius: var(--shape-l);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.22);
}

.hero__device figcaption {
  margin-top: 10px;
  color: var(--md-on-primary-container);
  opacity: 0.8;
}

/* ---- Sections ---- */
.section {
  padding: 40px 0;
}

.section__header {
  margin-bottom: 24px;
}

.section__title {
  color: var(--md-primary);
  margin-bottom: 8px;
}

.section__subtitle {
  color: var(--md-on-surface);
}

/* ---- Feature mosaic (expressive multi-tone) ---- */
.feature-mosaic {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-tile {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px;
  border-radius: var(--shape-xl);
  min-height: 0;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.feature-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.12);
}

.feature-tile--full {
  grid-column: span 3;
}

.feature-tile--wide {
  grid-column: span 2;
}

.feature-tile__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--shape-m);
  background: color-mix(in srgb, currentColor 16%, transparent);
}

.feature-tile__icon .material-symbols-outlined {
  font-size: 30px;
}

.feature-tile__body {
  margin-top: auto;
}

.feature-tile h3 {
  margin-bottom: 8px;
}

.feature-tile p {
  opacity: 0.86;
}

/* ---- FAQ ---- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xl);
  padding: 24px 28px;
}

.faq-item h3 {
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--md-on-surface-variant);
}

/* ---- Screenshots ---- */
.section--screens {
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xl);
  margin-inline: auto;
  width: min(100% - 32px, var(--max-width));
  padding: 56px clamp(20px, 4vw, 48px);
}

.section--screens .container {
  width: 100%;
  padding: 0;
}

.screens-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.screenshot-card {
  border-radius: var(--shape-l);
  overflow: hidden;
  background: var(--md-tertiary-container);
}

.screenshot-card img {
  transition: opacity 0.2s ease;
}

.screenshot-card img.is-fading {
  opacity: 0;
}

/* ---- Theme card ---- */
.theme-card {
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xl);
  padding: 24px;
}

.theme-card__header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
}

.theme-card__header h2 {
  margin-bottom: 4px;
}

.theme-card__note {
  margin-top: 20px;
  color: var(--md-on-surface-variant);
}

/* Segmented control — option_segment_toggle.dart */
.segmented-control {
  display: flex;
  gap: 8px;
  min-width: 240px;
}

.segmented-control__segment {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border: none;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface);
  transition: border-radius 0.15s, background 0.15s, flex 0.15s;
}

.segmented-control__segment:first-child {
  border-radius: 100px 16px 16px 100px;
}

.segmented-control__segment:last-child {
  border-radius: 16px 100px 100px 16px;
}

.segmented-control__segment--selected {
  flex: 1.33;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: 100px;
}

.segmented-control__segment .material-symbols-outlined {
  font-size: 20px;
}

/* Theme swatches — _ThemeColorSwatch */
.theme-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.theme-swatch {
  width: 52px;
  height: 52px;
  border: 3px solid transparent;
  border-radius: 12px;
  background: var(--swatch);
  cursor: pointer;
  padding: 0;
  transition: border-radius 0.2s, border-color 0.2s;
}

.theme-swatch:hover {
  border-radius: 20px;
}

.theme-swatch--selected {
  border-radius: 30px;
  border-color: color-mix(in srgb, var(--md-on-surface) 20%, transparent);
}

/* ---- Download band (colour-drenched tertiary) ---- */
.section.download-band {
  padding: 40px 0 48px;
}

.download-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px clamp(20px, 4vw, 48px);
  border-radius: var(--shape-xl);
  background: var(--md-tertiary);
  color: var(--md-on-tertiary);
}

.download-band h2 {
  margin-bottom: 6px;
}

.download-band p {
  opacity: 0.9;
}

/* ---- Footer ---- */
.footer {
  padding: 24px 0 32px;
  border-top: 1px solid var(--md-outline-variant);
}

.footer__inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px 24px;
  align-items: center;
}

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

.footer__brand img {
  border-radius: 10px;
}

.footer__links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.footer__icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--shape-full);
  color: var(--md-on-surface-variant);
  transition: background 0.15s, color 0.15s;
  flex-shrink: 0;
}

.footer__icon-link:hover {
  background: var(--md-surface-container-high);
  color: var(--md-on-surface);
  text-decoration: none;
}

.footer__icon-link .material-symbols-outlined,
.footer__icon-svg {
  width: 20px;
  height: 20px;
  display: block;
  flex-shrink: 0;
}

.footer__icon-link .material-symbols-outlined {
  font-size: 20px;
}

.footer__text-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  margin-left: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  color: var(--md-on-surface-variant);
  text-decoration: none;
  white-space: nowrap;
}

.footer__text-link:hover {
  color: var(--md-on-surface);
  text-decoration: underline;
}

.footer__disclaimer {
  grid-column: 1 / -1;
  color: var(--md-on-surface-variant);
}

.footer__copy {
  grid-column: 1 / -1;
  color: var(--md-on-surface-variant);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .hero__layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .feature-tile--full,
  .feature-tile--wide {
    grid-column: span 2;
  }
}

@media (max-width: 600px) {
  .top-app-bar__nav {
    display: none;
  }

  .menu-btn {
    display: inline-flex !important;
  }

  .hero {
    padding: 40px 0 48px;
  }

  .section {
    padding: 32px 0;
  }

  .section.download-band {
    padding: 32px 0 40px;
  }

  .feature-mosaic {
    grid-template-columns: 1fr;
  }

  .feature-tile--full,
  .feature-tile--wide {
    grid-column: span 1;
  }

  .feature-tile {
    min-height: 0;
  }

  .theme-card__header {
    flex-direction: column;
  }

  .segmented-control {
    width: 100%;
  }

  .download-band__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer__inner {
    grid-template-columns: 1fr;
  }

  .footer__links {
    justify-content: flex-start;
    flex-wrap: wrap;
  }
}