/* ===== Material Design 3 (Material You) Tokens ===== */
:root {
  /* Primary */
  --md-primary: #a8c7fa;
  --md-on-primary: #062e6f;
  --md-primary-container: #1b4587;
  --md-on-primary-container: #d3e3fd;

  /* Secondary */
  --md-secondary: #bec6dc;
  --md-on-secondary: #283141;
  --md-secondary-container: #3e4759;
  --md-on-secondary-container: #dae2f9;

  /* Tertiary */
  --md-tertiary: #d9bee1;
  --md-on-tertiary: #3d2846;
  --md-tertiary-container: #553f5d;
  --md-on-tertiary-container: #f6d9ff;

  /* Error */
  --md-error: #ffb4ab;
  --md-on-error: #690005;

  /* Surface (Dark Theme) */
  --md-surface: #111318;
  --md-surface-dim: #111318;
  --md-surface-bright: #37393e;
  --md-surface-container-lowest: #0c0e13;
  --md-surface-container-low: #191c20;
  --md-surface-container: #1d2024;
  --md-surface-container-high: #282a2f;
  --md-surface-container-highest: #33353a;
  --md-on-surface: #e2e2e9;
  --md-on-surface-variant: #c4c6d0;
  --md-outline: #8e9099;
  --md-outline-variant: #44474f;

  /* Elevation */
  --md-elevation-1: 0 1px 3px 1px rgba(0,0,0,0.15), 0 1px 2px 0 rgba(0,0,0,0.3);
  --md-elevation-2: 0 2px 6px 2px rgba(0,0,0,0.15), 0 1px 2px 0 rgba(0,0,0,0.3);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px 0 rgba(0,0,0,0.3);

  /* Shape */
  --md-shape-xs: 4px;
  --md-shape-sm: 8px;
  --md-shape-md: 12px;
  --md-shape-lg: 16px;
  --md-shape-xl: 28px;
  --md-shape-full: 9999px;

  /* Motion */
  --md-motion-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-motion-duration-short: 200ms;
  --md-motion-duration-medium: 400ms;
  --md-motion-duration-long: 600ms;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: 'Google Sans Text', 'Google Sans', 'Roboto', system-ui, sans-serif;
  background: var(--md-surface);
  color: var(--md-on-surface);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Top App Bar (MD3) ===== */
.top-app-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--md-surface-container);
  border-bottom: 1px solid var(--md-outline-variant);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.top-app-bar__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.top-app-bar__left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  color: var(--md-primary);
  font-size: 28px;
}

.top-app-bar__title {
  font-family: 'Google Sans', sans-serif;
  font-size: 20px;
  font-weight: 500;
  color: var(--md-on-surface);
  letter-spacing: 0.15px;
}

.top-app-bar__nav {
  display: flex;
  gap: 4px;
}

.nav-link {
  color: var(--md-on-surface-variant);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--md-shape-full);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

.nav-link:hover {
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface);
}

.nav-link.active {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.icon-btn {
  width: 40px; height: 40px;
  border: none;
  background: transparent;
  color: var(--md-on-surface-variant);
  border-radius: var(--md-shape-full);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  transition: background var(--md-motion-duration-short);
}

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

/* ===== Navigation Drawer (MD3) ===== */
.nav-drawer-scrim {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  opacity: 0;
  transition: opacity var(--md-motion-duration-medium) var(--md-motion-standard);
}

.nav-drawer-scrim.visible {
  opacity: 1;
}

.nav-drawer {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 280px;
  background: var(--md-surface-container-low);
  z-index: 201;
  padding: 16px 12px;
  transform: translateX(-100%);
  transition: transform var(--md-motion-duration-medium) var(--md-motion-emphasized);
  border-radius: 0 var(--md-shape-lg) var(--md-shape-lg) 0;
}

.nav-drawer.visible {
  transform: translateX(0);
}

.nav-drawer__header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  margin-bottom: 8px;
}

.nav-drawer__title {
  font-family: 'Google Sans', sans-serif;
  font-size: 22px;
  font-weight: 500;
}

.nav-drawer__item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px 14px 16px;
  border-radius: var(--md-shape-full);
  color: var(--md-on-surface-variant);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all var(--md-motion-duration-short);
}

.nav-drawer__item:hover {
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface);
}

.hidden { display: none !important; }

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 24px 60px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(168, 199, 250, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(217, 190, 225, 0.08) 0%, transparent 60%),
    var(--md-surface);
}

.hero__content {
  position: relative;
  text-align: center;
  max-width: 720px;
}

.hero__chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 6px 16px;
  border-radius: var(--md-shape-full);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
}

.hero__chip .material-symbols-outlined {
  font-size: 16px;
}

.hero__title {
  font-family: 'Google Sans', sans-serif;
  font-size: clamp(48px, 8vw, 80px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--md-on-surface);
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--md-primary), var(--md-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 18px;
  color: var(--md-on-surface-variant);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero__stats {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.stat-chip {
  background: var(--md-surface-container-high);
  border: 1px solid var(--md-outline-variant);
  padding: 8px 18px;
  border-radius: var(--md-shape-full);
  font-size: 14px;
  color: var(--md-on-surface-variant);
}

.stat-num {
  font-weight: 700;
  color: var(--md-primary);
  margin-right: 4px;
}

/* ===== MD3 Buttons ===== */
.md-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--md-shape-full);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  letter-spacing: 0.1px;
  transition: all var(--md-motion-duration-short) var(--md-motion-standard);
}

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

.md-btn--filled {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-elevation-1);
}

.md-btn--filled:hover {
  box-shadow: var(--md-elevation-2);
  filter: brightness(1.08);
}

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

.md-btn--tonal:hover {
  box-shadow: var(--md-elevation-1);
  filter: brightness(1.08);
}

/* ===== Sections ===== */
.section {
  padding: 96px 0;
}

.section--dark {
  background: var(--md-surface-container-lowest);
}

.section__title {
  font-family: 'Google Sans', sans-serif;
  font-size: 36px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  color: var(--md-on-surface);
}

.section__subtitle {
  text-align: center;
  color: var(--md-on-surface-variant);
  font-size: 16px;
  margin-bottom: 56px;
}

/* ===== Feature Cards (MD3 Outlined Cards) ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-md);
  padding: 28px 24px;
  transition: all var(--md-motion-duration-medium) var(--md-motion-standard);
}

.feature-card:hover {
  box-shadow: var(--md-elevation-2);
  border-color: var(--md-outline);
  transform: translateY(-2px);
}

.feature-card__icon {
  width: 48px; height: 48px;
  background: color-mix(in srgb, var(--card-color) 15%, transparent);
  border-radius: var(--md-shape-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card__icon .material-symbols-outlined {
  font-size: 24px;
  color: var(--card-color);
}

.feature-card h3 {
  font-family: 'Google Sans', sans-serif;
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--md-on-surface);
}

.feature-card p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
}

/* ===== Game Cards ===== */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.game-card {
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  overflow: hidden;
  transition: all var(--md-motion-duration-medium) var(--md-motion-standard);
}

.game-card:hover {
  box-shadow: var(--md-elevation-3);
  border-color: var(--md-outline);
  transform: translateY(-4px);
}

.game-card__banner {
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.game-card__icon {
  font-size: 72px;
  color: rgba(255, 255, 255, 0.3);
}

.game-card__body {
  padding: 24px;
}

.game-card__body h3 {
  font-family: 'Google Sans', sans-serif;
  font-size: 24px;
  font-weight: 500;
  margin-bottom: 8px;
}

.game-card__body p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
  margin-bottom: 16px;
}

.game-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.game-tag {
  padding: 4px 12px;
  border-radius: var(--md-shape-full);
  font-size: 12px;
  font-weight: 500;
  background: var(--md-surface-container-highest);
  color: var(--md-on-surface-variant);
}

.game-card__btn {
  width: 100%;
  justify-content: center;
  padding: 14px;
  font-size: 16px;
}

/* ===== Planes Showcase ===== */
.planes-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.plane-showcase {
  display: flex;
  gap: 28px;
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  padding: 28px;
  align-items: center;
  transition: all var(--md-motion-duration-medium) var(--md-motion-standard);
}

.plane-showcase:hover {
  box-shadow: var(--md-elevation-2);
  border-color: var(--md-outline);
}

.plane-showcase__visual {
  flex-shrink: 0;
  width: 100px; height: 100px;
  background: color-mix(in srgb, var(--plane-color) 12%, transparent);
  border-radius: var(--md-shape-xl);
  display: flex;
  align-items: center;
  justify-content: center;
}

.plane-icon {
  font-size: 44px;
  color: var(--plane-color);
  transform: rotate(-45deg);
}

.plane-showcase__info {
  flex: 1;
}

.plane-showcase__info h3 {
  font-family: 'Google Sans', sans-serif;
  font-size: 22px;
  font-weight: 500;
  margin-bottom: 4px;
}

.plane-tag {
  display: inline-block;
  padding: 2px 12px;
  border-radius: var(--md-shape-full);
  font-size: 12px;
  font-weight: 500;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  margin-bottom: 8px;
}

.plane-tag.free {
  background: color-mix(in srgb, #00e676 20%, transparent);
  color: #00e676;
}

.plane-tag.legendary {
  background: color-mix(in srgb, #ffd700 20%, transparent);
  color: #ffd700;
}

.plane-showcase__info p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  margin-bottom: 12px;
}

.stat-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-row span {
  font-size: 12px;
  color: var(--md-on-surface-variant);
  width: 60px;
  text-align: right;
}

.stat-track {
  flex: 1;
  height: 6px;
  background: var(--md-surface-container-highest);
  border-radius: var(--md-shape-full);
  max-width: 200px;
}

.stat-fill {
  height: 100%;
  border-radius: var(--md-shape-full);
  transition: width var(--md-motion-duration-long) var(--md-motion-emphasized);
}

/* ===== Steps / How to Play ===== */
.steps-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.step-card {
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  padding: 32px 24px;
  text-align: center;
  width: 260px;
  transition: all var(--md-motion-duration-medium) var(--md-motion-standard);
}

.step-card:hover {
  box-shadow: var(--md-elevation-2);
  transform: translateY(-4px);
}

.step-num {
  width: 48px; height: 48px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-radius: var(--md-shape-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: 'Google Sans', sans-serif;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-card h3 {
  font-family: 'Google Sans', sans-serif;
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  line-height: 1.6;
}

.step-connector {
  color: var(--md-outline);
}

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

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Google Sans', sans-serif;
  font-size: 16px;
  font-weight: 500;
  color: var(--md-on-surface);
}

.footer__brand .material-symbols-outlined {
  color: var(--md-primary);
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .top-app-bar__nav { display: none; }
  .menu-btn { display: flex; }

  .hero { padding: 100px 20px 40px; }
  .hero__title { font-size: 42px; }

  .section { padding: 64px 0; }
  .section__title { font-size: 28px; }

  .plane-showcase {
    flex-direction: column;
    text-align: center;
  }

  .stat-row span { text-align: center; }
  .stat-bars { align-items: center; }
  .stat-row { justify-content: center; }
  .stat-track { max-width: 180px; }

  .step-connector { display: none; }
  .steps-grid { flex-direction: column; }
  .step-card { width: 100%; max-width: 340px; }

  .footer__inner { flex-direction: column; gap: 12px; text-align: center; }

  .game-wrapper iframe { height: 60vh; min-height: 400px; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 34px; }
  .features-grid { grid-template-columns: 1fr; }
}

/* ===== Scroll animations ===== */
.feature-card, .plane-showcase, .step-card, .game-card {
  opacity: 0;
  transform: translateY(24px);
}

.feature-card.visible, .plane-showcase.visible, .step-card.visible, .game-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--md-motion-duration-long) var(--md-motion-emphasized),
              transform var(--md-motion-duration-long) var(--md-motion-emphasized);
}