/* ==========================================================================
   Material 3 Expressive — Design Tokens
   ========================================================================== */

:root {
  /* --- Color: Light Theme (M3 baseline purple) --- */
  --md-sys-color-primary: #6442d6;
  --md-sys-color-on-primary: #ffffff;
  --md-sys-color-primary-container: #e8ddff;
  --md-sys-color-on-primary-container: #1e0060;
  --md-sys-color-secondary: #605b71;
  --md-sys-color-on-secondary: #ffffff;
  --md-sys-color-secondary-container: #e6dff9;
  --md-sys-color-on-secondary-container: #1c192b;
  --md-sys-color-tertiary: #7d5260;
  --md-sys-color-on-tertiary: #ffffff;
  --md-sys-color-tertiary-container: #ffd9e3;
  --md-sys-color-on-tertiary-container: #31101d;
  --md-sys-color-error: #ba1a1a;
  --md-sys-color-on-error: #ffffff;
  --md-sys-color-error-container: #ffdad6;
  --md-sys-color-background: #fefbff;
  --md-sys-color-on-background: #1c1b1e;
  --md-sys-color-surface: #fefbff;
  --md-sys-color-on-surface: #1c1b1e;
  --md-sys-color-surface-variant: #e7e0ec;
  --md-sys-color-on-surface-variant: #49454e;
  --md-sys-color-outline: #7a757f;
  --md-sys-color-outline-variant: #cac4d0;
  --md-sys-color-surface-container-lowest: #ffffff;
  --md-sys-color-surface-container-low: #f7f2fa;
  --md-sys-color-surface-container: #f3edf7;
  --md-sys-color-surface-container-high: #ece6f0;
  --md-sys-color-surface-container-highest: #e6e0e9;
  --md-sys-color-inverse-surface: #313033;
  --md-sys-color-inverse-on-surface: #f4eff4;
  --md-sys-color-inverse-primary: #cfbcff;
  --md-sys-color-scrim: #000000;

  /* --- Shape --- */
  --md-sys-shape-corner-none: 0px;
  --md-sys-shape-corner-extra-small: 4px;
  --md-sys-shape-corner-small: 8px;
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-full: 9999px;

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

  /* --- Motion (M3 Expressive emphasized) --- */
  --md-sys-motion-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-sys-motion-easing-emphasized-decelerate: cubic-bezier(
    0.05,
    0.7,
    0.1,
    1
  );
  --md-sys-motion-easing-emphasized-accelerate: cubic-bezier(0.3, 0, 0.8, 0.15);
  --md-sys-motion-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-sys-motion-duration-short: 200ms;
  --md-sys-motion-duration-medium: 400ms;
  --md-sys-motion-duration-long: 600ms;

  /* --- State layer opacity --- */
  --md-sys-state-hover-opacity: 0.08;
  --md-sys-state-focus-opacity: 0.12;
  --md-sys-state-pressed-opacity: 0.12;
}

/* --- Color: Dark Theme --- */
@media (prefers-color-scheme: dark) {
  :root {
    --md-sys-color-primary: #cfbcff;
    --md-sys-color-on-primary: #381e72;
    --md-sys-color-primary-container: #4f378b;
    --md-sys-color-on-primary-container: #e8ddff;
    --md-sys-color-secondary: #ccc2dc;
    --md-sys-color-on-secondary: #332d41;
    --md-sys-color-secondary-container: #4a4458;
    --md-sys-color-on-secondary-container: #e6dff9;
    --md-sys-color-tertiary: #efb8c8;
    --md-sys-color-on-tertiary: #492532;
    --md-sys-color-tertiary-container: #633b48;
    --md-sys-color-on-tertiary-container: #ffd9e3;
    --md-sys-color-error: #ffb4ab;
    --md-sys-color-on-error: #690005;
    --md-sys-color-error-container: #93000a;
    --md-sys-color-background: #1c1b1e;
    --md-sys-color-on-background: #e6e1e5;
    --md-sys-color-surface: #1c1b1e;
    --md-sys-color-on-surface: #e6e1e5;
    --md-sys-color-surface-variant: #49454e;
    --md-sys-color-on-surface-variant: #cac4d0;
    --md-sys-color-outline: #948f99;
    --md-sys-color-outline-variant: #49454e;
    --md-sys-color-surface-container-lowest: #111113;
    --md-sys-color-surface-container-low: #1c1b1e;
    --md-sys-color-surface-container: #211f26;
    --md-sys-color-surface-container-high: #2b2930;
    --md-sys-color-surface-container-highest: #36343b;
    --md-sys-color-inverse-surface: #e6e1e5;
    --md-sys-color-inverse-on-surface: #313033;
    --md-sys-color-inverse-primary: #6750a4;
    --md-sys-color-scrim: #000000;

    --md-sys-elevation-1: 0px 1px 3px 1px rgba(0, 0, 0, 0.4),
      0px 1px 2px 0px rgba(0, 0, 0, 0.6);
    --md-sys-elevation-2: 0px 2px 6px 2px rgba(0, 0, 0, 0.4),
      0px 1px 2px 0px rgba(0, 0, 0, 0.6);
    --md-sys-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.4),
      0px 1px 3px 0px rgba(0, 0, 0, 0.6);
  }
}

/* ==========================================================================
   Base & Typography (M3 type scale)
   ========================================================================== */

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

body {
  font-family: "Noto Sans JP", "Roboto", sans-serif;
  background: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

.display-medium {
  font-size: 45px;
  line-height: 52px;
  font-weight: 700;
  letter-spacing: 0;
}

.body-large {
  font-size: 16px;
  line-height: 24px;
  font-weight: 400;
  letter-spacing: 0;
}

/* ==========================================================================
   Top App Bar
   ========================================================================== */

.top-app-bar {
  background: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 10;
  transition: box-shadow var(--md-sys-motion-duration-short)
    var(--md-sys-motion-easing-standard);
}

.top-app-bar.scrolled {
  background: var(--md-sys-color-surface-container);
  box-shadow: var(--md-sys-elevation-2);
}

.top-app-bar__content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.top-app-bar__icon {
  font-size: 28px;
  color: var(--md-sys-color-primary);
}

.top-app-bar__title {
  font-size: 22px;
  line-height: 30px;
  font-weight: 700;
  letter-spacing: 0;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  text-align: center;
  padding: 64px 24px 40px;
  background: var(--md-sys-color-surface-container-low);
}

.hero .display-medium {
  color: var(--md-sys-color-on-surface);
}

.hero__subtitle {
  color: var(--md-sys-color-on-surface-variant);
  margin-top: 8px;
}

@media (max-width: 600px) {
  .hero {
    padding: 40px 16px 32px;
  }

  .hero .display-medium {
    font-size: 28px;
    line-height: 36px;
  }
}

/* ==========================================================================
   Search Bar (M3 Expressive)
   ========================================================================== */

.search-bar {
  max-width: 520px;
  margin: 28px auto 0;
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar__icon {
  position: absolute;
  left: 16px;
  font-size: 24px;
  color: var(--md-sys-color-on-surface-variant);
  pointer-events: none;
}

.search-bar__input {
  width: 100%;
  padding: 16px 16px 16px 52px;
  border: none;
  border-radius: var(--md-sys-shape-corner-extra-large);
  font-size: 16px;
  font-family: inherit;
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
  outline: none;
  transition: background var(--md-sys-motion-duration-short)
      var(--md-sys-motion-easing-standard),
    box-shadow var(--md-sys-motion-duration-short)
      var(--md-sys-motion-easing-standard);
}

.search-bar__input::placeholder {
  color: var(--md-sys-color-on-surface-variant);
}

.search-bar__input:focus {
  background: var(--md-sys-color-surface-container-highest);
  box-shadow: var(--md-sys-elevation-1);
}

/* ==========================================================================
   Main Content
   ========================================================================== */

main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

@media (max-width: 600px) {
  main {
    padding: 24px 16px 40px;
  }
}

/* ==========================================================================
   App Card Grid
   ========================================================================== */

#app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

@media (max-width: 360px) {
  #app-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   App Card (M3 Expressive — Filled Card)
   ========================================================================== */

.app-card {
  display: flex;
  flex-direction: column;
  background: var(--md-sys-color-surface-container-low);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 24px;
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
  position: relative;
  overflow: hidden;
  transition: transform var(--md-sys-motion-duration-medium)
      var(--md-sys-motion-easing-emphasized),
    box-shadow var(--md-sys-motion-duration-medium)
      var(--md-sys-motion-easing-emphasized),
    background var(--md-sys-motion-duration-short)
      var(--md-sys-motion-easing-standard);
  animation: card-enter var(--md-sys-motion-duration-medium)
    var(--md-sys-motion-easing-emphasized-decelerate) both;
}

.app-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--md-sys-color-on-surface);
  opacity: 0;
  transition: opacity var(--md-sys-motion-duration-short)
    var(--md-sys-motion-easing-standard);
  pointer-events: none;
}

.app-card:hover::before {
  opacity: var(--md-sys-state-hover-opacity);
}

.app-card:active::before {
  opacity: var(--md-sys-state-pressed-opacity);
}

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

.app-card:active {
  transform: scale(0.98);
}

.app-card__icon-container {
  width: 64px;
  height: 64px;
  border-radius: var(--md-sys-shape-corner-large);
  background: var(--md-sys-color-primary-container);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin-bottom: 16px;
  transition: border-radius var(--md-sys-motion-duration-medium)
    var(--md-sys-motion-easing-emphasized);
}

.app-card:hover .app-card__icon-container {
  border-radius: var(--md-sys-shape-corner-extra-large);
}

.app-card__name {
  font-size: 16px;
  font-weight: 500;
  line-height: 24px;
  color: var(--md-sys-color-on-surface);
}

.app-card__description {
  font-size: 14px;
  line-height: 20px;
  color: var(--md-sys-color-on-surface-variant);
  margin-top: 4px;
  flex: 1;
}

.app-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.app-card__tag {
  font-size: 12px;
  line-height: 16px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: var(--md-sys-shape-corner-full);
  background: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  letter-spacing: 0.1px;
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: 80px 24px;
  color: var(--md-sys-color-on-surface-variant);
  grid-column: 1 / -1;
}

.empty-state__icon {
  width: 88px;
  height: 88px;
  border-radius: var(--md-sys-shape-corner-extra-large);
  background: var(--md-sys-color-surface-container-high);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 40px;
}

.empty-state__title {
  font-size: 22px;
  line-height: 28px;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
  margin-bottom: 8px;
}

.empty-state__body {
  font-size: 14px;
  line-height: 20px;
  max-width: 360px;
  margin: 0 auto;
}

/* ==========================================================================
   Footer
   ========================================================================== */

footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 20px;
  font-weight: 500;
  color: var(--md-sys-color-primary);
  text-decoration: none;
  padding: 10px 24px;
  border-radius: var(--md-sys-shape-corner-full);
  transition: background var(--md-sys-motion-duration-short)
    var(--md-sys-motion-easing-standard);
}

.footer__link:hover {
  background: color-mix(
    in srgb,
    var(--md-sys-color-primary) calc(var(--md-sys-state-hover-opacity) * 100%),
    transparent
  );
}

.footer__link .material-symbols-outlined {
  font-size: 18px;
}

@keyframes card-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}