/* ==========================================================================
   Redirect Guard for Android - Material Design 3 (M3) Web Design System
   Matches Android Compose App Theme (Dark, AMOLED Dark, Light)
   ========================================================================== */

:root,
html[data-theme="dark"] {
  /* Material Design 3 - Dark Theme (Matches Compose Color.kt) */
  --md-sys-color-primary: #9ECAFF;
  --md-sys-color-on-primary: #003258;
  --md-sys-color-primary-container: #00497D;
  --md-sys-color-on-primary-container: #D1E4FF;

  --md-sys-color-secondary: #B9C8DA;
  --md-sys-color-on-secondary: #243240;
  --md-sys-color-secondary-container: #3B4857;
  --md-sys-color-on-secondary-container: #D6E4F7;

  --md-sys-color-tertiary: #A5D3E8;
  --md-sys-color-on-tertiary: #063543;
  --md-sys-color-tertiary-container: #224C5B;
  --md-sys-color-on-tertiary-container: #BFE9FF;

  --md-sys-color-error: #FFB4AB;
  --md-sys-color-on-error: #690005;
  --md-sys-color-error-container: #93000A;
  --md-sys-color-on-error-container: #FFDAD6;

  --md-sys-color-background: #101317;
  --md-sys-color-on-background: #E2E2E6;
  --md-sys-color-surface: #101317;
  --md-sys-color-surface-dim: #0B0E11;
  --md-sys-color-surface-bright: #31353C;
  --md-sys-color-surface-container-lowest: #0B0E11;
  --md-sys-color-surface-container-low: #181C21;
  --md-sys-color-surface-container: #1C2026;
  --md-sys-color-surface-container-high: #262A30;
  --md-sys-color-surface-container-highest: #31353C;
  --md-sys-color-on-surface: #E2E2E6;
  --md-sys-color-on-surface-variant: #C3C7D0;

  --md-sys-color-outline: #8D9199;
  --md-sys-color-outline-variant: #44474E;
  --md-sys-color-shadow: #000000;
  --md-sys-color-scrim: #000000;

  /* Security & Protection Status Colors */
  --shield-green: #22C55E;
  --shield-green-container: rgba(34, 197, 94, 0.14);
  --shield-blue: #38BDF8;
  --shield-blue-container: rgba(56, 189, 248, 0.14);
  --shield-orange: #F97316;
  --shield-red: #EF4444;
  --glow-primary: rgba(158, 202, 255, 0.22);

  --header-bg: rgba(16, 19, 23, 0.88);
  --card-bg-gradient: linear-gradient(180deg, rgba(28, 32, 38, 0.8) 0%, rgba(24, 28, 33, 0.95) 100%);
  --hero-radial: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(158, 202, 255, 0.14), transparent 70%),
                 radial-gradient(ellipse 60% 40% at 90% 30%, rgba(56, 189, 248, 0.08), transparent 70%);
}

html[data-theme="amoled"] {
  /* Material Design 3 - Pure AMOLED Black */
  --md-sys-color-primary: #9ECAFF;
  --md-sys-color-on-primary: #003258;
  --md-sys-color-primary-container: #003660;
  --md-sys-color-on-primary-container: #D1E4FF;

  --md-sys-color-secondary: #B9C8DA;
  --md-sys-color-on-secondary: #243240;
  --md-sys-color-secondary-container: #1C242D;
  --md-sys-color-on-secondary-container: #D6E4F7;

  --md-sys-color-tertiary: #A5D3E8;
  --md-sys-color-on-tertiary: #063543;
  --md-sys-color-tertiary-container: #182C35;
  --md-sys-color-on-tertiary-container: #BFE9FF;

  --md-sys-color-error: #FFB4AB;
  --md-sys-color-on-error: #690005;
  --md-sys-color-error-container: #93000A;
  --md-sys-color-on-error-container: #FFDAD6;

  --md-sys-color-background: #000000;
  --md-sys-color-on-background: #EEEEEE;
  --md-sys-color-surface: #000000;
  --md-sys-color-surface-dim: #000000;
  --md-sys-color-surface-bright: #222222;
  --md-sys-color-surface-container-lowest: #000000;
  --md-sys-color-surface-container-low: #06080B;
  --md-sys-color-surface-container: #0B0E13;
  --md-sys-color-surface-container-high: #12161D;
  --md-sys-color-surface-container-highest: #1B2028;
  --md-sys-color-on-surface: #EEEEEE;
  --md-sys-color-on-surface-variant: #C3C7D0;

  --md-sys-color-outline: #555555;
  --md-sys-color-outline-variant: #22262E;
  --md-sys-color-shadow: #000000;
  --md-sys-color-scrim: #000000;

  --shield-green: #22C55E;
  --shield-green-container: rgba(34, 197, 94, 0.14);
  --shield-blue: #38BDF8;
  --shield-blue-container: rgba(56, 189, 248, 0.14);
  --shield-orange: #F97316;
  --shield-red: #EF4444;
  --glow-primary: rgba(158, 202, 255, 0.15);

  --header-bg: rgba(0, 0, 0, 0.88);
  --card-bg-gradient: linear-gradient(180deg, #0A0D12 0%, #000000 100%);
  --hero-radial: radial-gradient(ellipse 70% 40% at 50% -10%, rgba(158, 202, 255, 0.12), transparent 70%);
}

html[data-theme="light"] {
  /* Material Design 3 - Light Theme */
  --md-sys-color-primary: #0F5B9B;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #D1E4FF;
  --md-sys-color-on-primary-container: #001D36;

  --md-sys-color-secondary: #526070;
  --md-sys-color-on-secondary: #FFFFFF;
  --md-sys-color-secondary-container: #D6E4F7;
  --md-sys-color-on-secondary-container: #0F1D2A;

  --md-sys-color-tertiary: #3A6472;
  --md-sys-color-on-tertiary: #FFFFFF;
  --md-sys-color-tertiary-container: #BFE9FF;
  --md-sys-color-on-tertiary-container: #001F28;

  --md-sys-color-error: #BA1A1A;
  --md-sys-color-on-error: #FFFFFF;
  --md-sys-color-error-container: #FFDAD6;
  --md-sys-color-on-error-container: #410002;

  --md-sys-color-background: #F7F9FC;
  --md-sys-color-on-background: #191C20;
  --md-sys-color-surface: #F7F9FC;
  --md-sys-color-surface-dim: #D7DCE3;
  --md-sys-color-surface-bright: #F7F9FC;
  --md-sys-color-surface-container-lowest: #FFFFFF;
  --md-sys-color-surface-container-low: #F1F4F9;
  --md-sys-color-surface-container: #EBEFF5;
  --md-sys-color-surface-container-high: #E5E9F0;
  --md-sys-color-surface-container-highest: #DFE3EB;
  --md-sys-color-on-surface: #191C20;
  --md-sys-color-on-surface-variant: #43474E;

  --md-sys-color-outline: #73777F;
  --md-sys-color-outline-variant: #C4C8D2;
  --md-sys-color-shadow: rgba(0, 0, 0, 0.12);
  --md-sys-color-scrim: rgba(0, 0, 0, 0.38);

  --shield-green: #15803D;
  --shield-green-container: #DCFCE7;
  --shield-blue: #0284C7;
  --shield-blue-container: #E0F2FE;
  --shield-orange: #C2410C;
  --shield-red: #B91C1C;
  --glow-primary: rgba(15, 91, 155, 0.16);

  --header-bg: rgba(247, 249, 252, 0.9);
  --card-bg-gradient: linear-gradient(180deg, #FFFFFF 0%, #F1F4F9 100%);
  --hero-radial: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(209, 228, 255, 0.45), transparent 70%),
                 radial-gradient(ellipse 60% 40% at 90% 30%, rgba(224, 242, 254, 0.35), transparent 70%);
}

/* Material Design 3 Shape Tokens */
:root {
  --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;

  /* Fonts */
  --font-sans: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;

  /* Material 3 Component Custom Properties Bridge */
  --md-filled-button-container-color: var(--md-sys-color-primary);
  --md-filled-button-label-text-color: var(--md-sys-color-on-primary);
  --md-filled-button-icon-color: var(--md-sys-color-on-primary);
  --md-filled-button-container-shape: var(--md-sys-shape-corner-full);

  --md-outlined-button-outline-color: var(--md-sys-color-outline);
  --md-outlined-button-label-text-color: var(--md-sys-color-primary);
  --md-outlined-button-icon-color: var(--md-sys-color-primary);
  --md-outlined-button-container-shape: var(--md-sys-shape-corner-full);

  --md-tonal-button-container-color: var(--md-sys-color-secondary-container);
  --md-tonal-button-label-text-color: var(--md-sys-color-on-secondary-container);
  --md-tonal-button-icon-color: var(--md-sys-color-on-secondary-container);
  --md-tonal-button-container-shape: var(--md-sys-shape-corner-full);

  --md-primary-tab-active-indicator-color: var(--md-sys-color-primary);
  --md-primary-tab-active-label-text-color: var(--md-sys-color-primary);
  --md-primary-tab-active-icon-color: var(--md-sys-color-primary);
  --md-primary-tab-label-text-color: var(--md-sys-color-on-surface-variant);
  --md-primary-tab-icon-color: var(--md-sys-color-on-surface-variant);

  --md-chip-container-shape: var(--md-sys-shape-corner-full);
}

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  overflow-x: clip;
  max-width: 100vw;
  width: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--md-sys-color-background);
  background-image: var(--hero-radial);
  background-attachment: fixed;
  overflow-x: hidden;
  overflow-x: clip;
  max-width: 100vw;
  width: 100%;
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 20px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-feature-settings: 'liga';
  -webkit-font-smoothing: antialiased;
  vertical-align: middle;
}

/* Material Component Slotted SVGs */
md-filled-button svg[slot="icon"],
md-outlined-button svg[slot="icon"],
md-tonal-button svg[slot="icon"] {
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  flex-shrink: 0;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
  min-width: 0;
}

/* ==========================================================================
   Header / M3 Top App Bar
   ========================================================================== */
.m3-top-app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  max-width: 100vw;
  background-color: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
  gap: 1rem;
  min-width: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--md-sys-color-on-surface);
}

.brand-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.55rem;
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border-radius: var(--md-sys-shape-corner-full);
}

/* Center Tabs */
.header-nav-tabs {
  display: none;
  flex: 1;
  max-width: 580px;
  margin: 0 auto;
  --md-primary-tab-container-height: 4.25rem;
}

@media (min-width: 860px) {
  .header-nav-tabs {
    display: flex;
  }
}

.header-nav-tabs md-tabs {
  width: 100%;
  --md-primary-tab-label-text-size: 0.875rem;
  --md-primary-tab-label-text-weight: 500;
}

.header-nav-tabs md-primary-tab {
  font-family: var(--font-sans);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

#theme-toggle-btn,
#mobile-menu-btn,
#drawer-close-btn {
  --md-icon-button-icon-color: var(--md-sys-color-on-surface);
}

#theme-toggle-btn {
  transition: transform 0.2s ease;
}

#theme-toggle-btn:hover {
  transform: rotate(15deg);
}

.mobile-only {
  display: none !important;
}

.nav-actions md-outlined-button,
.nav-actions md-filled-button {
  --md-filled-button-container-height: 40px;
  --md-outlined-button-container-height: 40px;
  --md-filled-button-leading-space: 18px;
  --md-filled-button-trailing-space: 20px;
  --md-filled-button-with-leading-icon-leading-space: 16px;
  --md-filled-button-with-leading-icon-trailing-space: 20px;
  --md-filled-button-icon-label-space: 8px;

  --md-outlined-button-leading-space: 18px;
  --md-outlined-button-trailing-space: 20px;
  --md-outlined-button-with-leading-icon-leading-space: 16px;
  --md-outlined-button-with-leading-icon-trailing-space: 20px;
  --md-outlined-button-icon-label-space: 8px;
  font-size: 0.875rem;
  font-weight: 600;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 3rem 0 2.5rem;
  scroll-margin-top: 5rem;
}

.hero-card {
  background: var(--card-bg-gradient);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 2.5rem;
  box-shadow: 0 10px 30px -10px var(--md-sys-color-shadow);
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.hero-header-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.app-icon-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.app-icon {
  width: 6.25rem;
  height: 6.25rem;
  object-fit: contain;
}

.hero-title-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 0;
}

.app-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.35rem;
}

.app-name {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--md-sys-color-on-surface);
  line-height: 1.2;
}

.app-developer {
  font-size: 0.9375rem;
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
}

.app-developer span {
  color: var(--md-sys-color-primary);
  font-weight: 600;
}

.verified-icon {
  width: 1.1rem;
  height: 1.1rem;
  display: inline-block;
  vertical-align: middle;
}

.app-summary {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface);
  max-width: 720px;
  margin: 0 auto 1.5rem;
  text-align: center;
}

/* Feature Chips Row */
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 auto 1.5rem;
  align-items: center;
  justify-content: center;
}

.badge-row md-assist-chip {
  --md-assist-chip-container-shape: var(--md-sys-shape-corner-full);
  --md-assist-chip-container-height: 34px;
  --md-assist-chip-outline-color: var(--md-sys-color-outline-variant);
  --md-assist-chip-label-text-color: var(--md-sys-color-on-surface);
  --md-assist-chip-icon-color: var(--md-sys-color-primary);
  --md-assist-chip-leading-space: 14px;
  --md-assist-chip-trailing-space: 14px;
  --md-assist-chip-with-leading-icon-leading-space: 12px;
  --md-assist-chip-with-leading-icon-trailing-space: 14px;
  --md-assist-chip-icon-label-space: 8px;
  --md-assist-chip-label-text-size: 0.8125rem;
  --md-assist-chip-label-text-weight: 500;
  cursor: default;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.badge-row md-assist-chip:hover {
  --md-assist-chip-outline-color: var(--md-sys-color-outline);
}

.badge-row md-assist-chip.highlight-chip {
  --md-assist-chip-container-color: var(--md-sys-color-surface-container-high);
  --md-assist-chip-outline-color: var(--md-sys-color-primary);
  --md-assist-chip-label-text-color: var(--md-sys-color-primary);
  font-weight: 600;
  cursor: pointer;
}

/* Hero CTA Buttons */
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.hero-actions md-filled-button,
.hero-actions md-outlined-button {
  --md-filled-button-container-height: 48px;
  --md-outlined-button-container-height: 48px;
  --md-filled-button-leading-space: 24px;
  --md-filled-button-trailing-space: 24px;
  --md-filled-button-with-leading-icon-leading-space: 20px;
  --md-filled-button-with-leading-icon-trailing-space: 24px;
  --md-filled-button-icon-label-space: 10px;

  --md-outlined-button-leading-space: 24px;
  --md-outlined-button-trailing-space: 24px;
  --md-outlined-button-with-leading-icon-leading-space: 20px;
  --md-outlined-button-with-leading-icon-trailing-space: 24px;
  --md-outlined-button-icon-label-space: 10px;

  font-weight: 600;
  font-size: 0.95rem;
}

#share-btn {
  --md-outlined-button-label-text-color: var(--md-sys-color-on-surface);
}

/* Download APK Button Size Badge */
.btn-badge {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.2rem 0.65rem;
  margin-left: 0.65rem;
  border-radius: var(--md-sys-shape-corner-full);
  background-color: rgba(0, 0, 0, 0.16);
  color: var(--md-sys-color-on-primary);
  border: 1px solid rgba(0, 0, 0, 0.14);
  vertical-align: middle;
  line-height: 1.2;
  display: inline-flex;
  align-items: center;
}

html[data-theme="light"] .btn-badge {
  background-color: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.35);
  color: #FFFFFF;
}

.store-badges-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.85rem auto 1rem;
}

.store-badges-row a img {
  height: 56px;
  width: auto;
  max-width: 100%;
  border-radius: var(--md-sys-shape-corner-medium);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.store-badges-row a img:hover {
  transform: translateY(-2px);
  opacity: 0.95;
}

/* Material Design 3 Alert Callout */
.m3-alert {
  --alert-accent: var(--shield-blue);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.85rem 1.1rem;
  margin: 0.85rem auto;
  border-radius: var(--md-sys-shape-corner-medium);
  background-color: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-left: 4px solid var(--alert-accent);
  max-width: 720px;
  width: 100%;
  box-sizing: border-box;
  text-align: left;
}

.m3-alert-warning {
  --alert-accent: var(--shield-orange);
}

.m3-alert-tip {
  --alert-accent: var(--shield-green);
}

.m3-alert-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--md-sys-color-on-surface);
}

.m3-alert-icon {
  color: var(--alert-accent);
  font-size: 1.2rem;
}

.m3-alert-body {
  font-size: 0.875rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.5;
}

.m3-alert-body a {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
}

.download-note {
  font-size: 0.85rem;
  color: var(--md-sys-color-on-surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.45rem;
  margin: 0.75rem auto 0;
}

.download-note a {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
}

/* Quick Stats Strip */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--md-sys-color-outline-variant);
}

@media (min-width: 640px) {
  .stats-strip {
    grid-template-columns: repeat(5, 1fr);
  }
}

.stat-item {
  background-color: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-large);
  padding: 1rem 0.75rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.stat-item:hover {
  transform: translateY(-2px);
  background-color: var(--md-sys-color-surface-container-high);
  border-color: var(--md-sys-color-primary);
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin-bottom: 0.25rem;
  font-family: var(--font-sans);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--md-sys-color-on-surface-variant);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

@media (max-width: 639px) {
  .stat-item:last-child:nth-child(odd) {
    grid-column: span 2;
  }
}

/* ==========================================================================
   Generic Section Layout
   ========================================================================== */
.section {
  padding: 3.5rem 0;
  scroll-margin-top: 4.5rem;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}

.section-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.section-subtitle {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--md-sys-color-primary);
}

.section-title {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--md-sys-color-on-surface);
}

/* ==========================================================================
   Screenshots Carousel Section
   ========================================================================== */
.gallery-nav {
  display: flex;
  gap: 0.5rem;
}

.gallery-scroll-container {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 1.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-outline-variant) transparent;
}

.gallery-scroll-container::-webkit-scrollbar {
  height: 8px;
}

.gallery-scroll-container::-webkit-scrollbar-track {
  background: transparent;
}

.gallery-scroll-container::-webkit-scrollbar-thumb {
  background-color: var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
}

.gallery-item {
  flex: 0 0 calc(25% - 1rem);
  min-width: 240px;
  scroll-snap-align: start;
  cursor: pointer;
  border-radius: var(--md-sys-shape-corner-large);
  overflow: hidden;
  border: 1px solid var(--md-sys-color-outline-variant);
  background-color: var(--md-sys-color-surface-container);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}

.gallery-item:hover {
  transform: translateY(-4px);
  border-color: var(--md-sys-color-primary);
  box-shadow: 0 8px 24px -6px var(--md-sys-color-shadow);
}

.gallery-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 9 / 19.5;
  background-color: var(--md-sys-color-surface-container-highest);
  overflow: hidden;
}

.gallery-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-img-wrap img {
  transform: scale(1.02);
}

.gallery-caption {
  padding: 0.85rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
  background-color: var(--md-sys-color-surface-container);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  text-align: center;
}

/* ==========================================================================
   What's New / Changelogs Section
   ========================================================================== */
.changelogs-card {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-large);
  padding: 1.5rem;
}

.changelogs-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.changelog-details {
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  background-color: var(--md-sys-color-surface-container-high);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.changelog-details[open] {
  border-color: var(--md-sys-color-primary);
}

.changelog-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.changelog-summary::-webkit-details-marker {
  display: none;
}

.changelog-summary-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.changelog-version-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
}

.changelog-tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: var(--md-sys-shape-corner-full);
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.changelog-tag.prev {
  background-color: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface-variant);
}

.changelog-summary-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--md-sys-color-on-surface-variant);
}

.changelog-date {
  font-size: 0.85rem;
}

.changelog-chevron {
  transition: transform 0.25s ease;
}

.changelog-details[open] .changelog-chevron {
  transform: rotate(180deg);
}

.changelog-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  background-color: var(--md-sys-color-surface-container);
}

.changelog-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 1rem;
}

.changelog-category {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--md-sys-color-primary);
  margin-top: 0.5rem;
}

.changelog-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.925rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.5;
}

.changelog-bullet {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--md-sys-color-primary);
  margin-top: 0.55rem;
  flex-shrink: 0;
}

.changelog-item strong {
  color: var(--md-sys-color-on-surface);
}

/* ==========================================================================
   Features Grid Section
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background-color: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-large);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--md-sys-color-primary);
}

.feature-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--md-sys-shape-corner-medium);
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.25rem;
}

.feature-icon-box.green {
  background-color: var(--shield-green-container);
  color: var(--shield-green);
}

.feature-icon-box.blue {
  background-color: var(--shield-blue-container);
  color: var(--shield-blue);
}

.feature-card h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--md-sys-color-on-surface);
}

.feature-card p {
  font-size: 0.925rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.55;
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--md-sys-color-surface-container-highest);
  padding: 0.15rem 0.35rem;
  border-radius: var(--md-sys-shape-corner-extra-small);
  color: var(--md-sys-color-primary);
}

/* ==========================================================================
   Technical Specifications Table
   ========================================================================== */
.specs-card {
  background-color: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-extra-large);
  overflow: hidden;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.specs-table tr {
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  transition: background-color 0.15s ease;
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table tr:hover {
  background-color: var(--md-sys-color-surface-container-high);
}

.specs-table th {
  padding: 1rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--md-sys-color-on-surface-variant);
  width: 28%;
  vertical-align: middle;
}

.specs-table td {
  padding: 1rem 1.5rem;
  font-size: 0.925rem;
  color: var(--md-sys-color-on-surface);
  vertical-align: middle;
}

.code-pill {
  font-family: var(--font-mono);
  font-size: 0.825rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--md-sys-shape-corner-extra-small);
  background-color: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface);
}

/* ==========================================================================
   Lightbox Modal
   ========================================================================== */
.lightbox-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background-color: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.lightbox-modal.open {
  display: flex;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img {
  max-width: 100%;
  max-height: 88vh;
  object-fit: contain;
  border-radius: var(--md-sys-shape-corner-medium);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease;
}

.lightbox-close:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* ==========================================================================
   Toast Notification / Snackbar
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  opacity: 0;
  background-color: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  box-shadow: 0 8px 24px var(--md-sys-color-shadow);
  z-index: 150;
  font-size: 0.9rem;
  font-weight: 500;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1), opacity 0.3s ease;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--md-sys-color-outline-variant);
  background-color: var(--md-sys-color-surface-container-low);
  padding: 3rem 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  align-items: center;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  list-style: none;
}

.footer-link {
  font-size: 0.9rem;
  color: var(--md-sys-color-on-surface-variant);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--md-sys-color-primary);
}

.footer-meta {
  font-size: 0.85rem;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.6;
}

/* ==========================================================================
   Mobile Navigation Drawer
   ========================================================================== */
.mobile-drawer-scrim {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.2, 0, 0, 1);
}

.mobile-drawer-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(340px, 86vw);
  background-color: var(--md-sys-color-surface-container-low);
  border-left: 1px solid var(--md-sys-color-outline-variant);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.5);
  z-index: 1001;
  transform: translateX(105%);
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1), visibility 0.35s ease;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1rem;
  overflow-y: auto;
  border-top-left-radius: var(--md-sys-shape-corner-extra-large);
  border-bottom-left-radius: var(--md-sys-shape-corner-extra-large);
}

.mobile-nav-drawer.open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.5rem 0.5rem;
}

.drawer-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.drawer-divider {
  height: 1px;
  background-color: var(--md-sys-color-outline-variant);
  margin: 0.75rem 0;
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.drawer-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.15rem;
  border-radius: var(--md-sys-shape-corner-full);
  color: var(--md-sys-color-on-surface-variant);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.drawer-item .drawer-icon {
  font-size: 1.35rem;
  color: inherit;
}

.drawer-item:hover {
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}

.drawer-item.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  font-weight: 600;
}

.drawer-item.active .drawer-icon {
  color: var(--md-sys-color-primary);
}

.drawer-footer-actions {
  margin-top: auto;
  padding-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.drawer-footer-actions md-filled-button,
.drawer-footer-actions md-outlined-button {
  width: 100%;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 860px) {
  .mobile-only {
    display: inline-flex !important;
  }

  #nav-github-btn,
  #nav-download-btn {
    display: none !important;
  }

  .nav-actions {
    gap: 0.4rem;
  }

  .brand-title {
    font-size: 1.05rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.25rem;
  }

  .hero-header-row {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
  }

  .hero-title-group {
    align-items: center;
    text-align: center;
  }

  .app-summary {
    text-align: center;
  }

  .app-title-row {
    justify-content: center;
  }

  .app-developer {
    justify-content: center;
  }

  .badge-row {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .store-badges-row {
    justify-content: center;
  }

  .download-note {
    justify-content: center;
    text-align: center;
  }

  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
    text-align: center;
  }

  .stat-value {
    justify-content: center;
  }

  .gallery-item {
    flex: 0 0 calc(45% - 0.5rem);
    min-width: 180px;
  }

  .specs-card {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .specs-table, 
  .specs-table tbody, 
  .specs-table tr {
    display: block;
    width: 100%;
  }

  .specs-table tr {
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
  }

  .specs-table tr:last-child {
    border-bottom: none;
  }

  .specs-table th {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem 0.2rem;
    border-bottom: none;
    background: transparent;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--md-sys-color-primary);
    letter-spacing: 0.02em;
  }

  .specs-table td {
    display: block;
    width: 100%;
    padding: 0.2rem 1rem 0.85rem;
    border-bottom: none;
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface);
    word-break: break-word;
    line-height: 1.5;
  }

  .section-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
    max-width: 100%;
    overflow-x: clip;
  }

  .header-content {
    height: 3.75rem;
    gap: 0.5rem;
  }

  .brand-title {
    font-size: 0.95rem;
    gap: 0.35rem;
  }

  .brand-badge {
    font-size: 0.625rem;
    padding: 0.1rem 0.45rem;
  }

  .hero-card {
    padding: 1.5rem 1rem;
  }

  .app-icon {
    width: 4.75rem;
    height: 4.75rem;
  }

  .app-name {
    font-size: 1.85rem;
  }

  .hero-actions md-filled-button,
  .hero-actions md-outlined-button {
    width: 100%;
  }

  .badge-row md-assist-chip {
    font-size: 0.775rem;
  }

  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    max-width: calc(100vw - 2rem);
    justify-content: center;
  }
}