/* 
 * Official Pustak & Material You (Material 3) Design System
 * Palette: Google Ice Blue (#A8C7FA) & Graphite (#131314)
 * Typography: Plus Jakarta Sans, Outfit & Inter
 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&family=Outfit:wght@500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200');

:root {
  /* Surface Tones: Official Google Graphite Canvas & Slate Containers */
  --md-sys-color-surface: #131314;
  --md-sys-color-surface-dim: #0E0E0F;
  --md-sys-color-surface-bright: #1E1F20;
  --md-sys-color-surface-container-lowest: #0E0E0F;
  --md-sys-color-surface-container-low: #18191A;
  --md-sys-color-surface-container: #1E1F20;
  --md-sys-color-surface-container-high: #282A2C;
  --md-sys-color-surface-container-highest: #333538;

  /* Primary Accent: Google Ice Blue */
  --md-sys-color-primary: #A8C7FA;
  --md-sys-color-on-primary: #042B59;
  --md-sys-color-primary-container: #1A273D;
  --md-sys-color-on-primary-container: #D3E3FD;

  /* Secondary Neutral Tones */
  --md-sys-color-secondary: #C4C7C5;
  --md-sys-color-on-secondary: #2D312E;
  --md-sys-color-secondary-container: #282A2C;
  --md-sys-color-on-secondary-container: #E3E3E3;

  /* Typography & Outlines */
  --md-sys-color-on-surface: #E3E3E3;
  --md-sys-color-on-surface-variant: #C4C7C5;
  --md-sys-color-outline: #8E918F;
  --md-sys-color-outline-variant: #282A2C;

  /* Typography */
  --font-brand: 'Plus Jakarta Sans', 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-plain: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows & Shapes */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.5);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-plain);
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* Material Symbols Rounded Utility */
.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
}

.material-symbols-rounded.filled {
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Bugdroid Android Vector Icon */
.android-icon {
  display: inline-block;
  vertical-align: middle;
  fill: currentColor;
}

/* Ambient Radial Glow */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 600px;
  background: radial-gradient(circle, rgba(168, 199, 250, 0.06) 0%, rgba(8, 66, 160, 0.02) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Top App Bar */
.m3-top-bar {
  height: 64px;
  background-color: rgba(19, 19, 20, 0.88);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.m3-top-bar-inner {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.m3-brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--md-sys-color-on-surface);
}

.m3-brand-logo {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.m3-brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.m3-brand-title {
  font-family: var(--font-brand);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.m3-nav-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: var(--radius-full);
  background-color: var(--md-sys-color-surface-container-high);
  border: 1px solid var(--md-sys-color-outline-variant);
  color: var(--md-sys-color-on-surface);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.m3-nav-pill:hover {
  background-color: var(--md-sys-color-surface-container-highest);
  border-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-primary);
  transform: translateX(-2px);
}

/* Page Layout */
.m3-main-container {
  max-width: 920px;
  width: 100%;
  margin: 36px auto 68px;
  padding: 0 20px;
  flex: 1;
  position: relative;
  z-index: 1;
}

/* M3 Hero Header Card */
.m3-hero-card {
  background: linear-gradient(180deg, var(--md-sys-color-surface-container) 0%, var(--md-sys-color-surface-container-low) 100%);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.m3-hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(168, 199, 250, 0.4), transparent);
}

.m3-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  background-color: rgba(168, 199, 250, 0.12);
  color: var(--md-sys-color-primary);
  border: 1px solid rgba(168, 199, 250, 0.25);
}

.m3-hero-title {
  font-family: var(--font-brand);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #FFFFFF;
  line-height: 1.25;
  margin-bottom: 10px;
}

.m3-hero-subtitle {
  font-size: 15.5px;
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 12px;
  line-height: 1.55;
  max-width: 680px;
}

.m3-hero-meta {
  font-size: 13px;
  color: var(--md-sys-color-on-surface-variant);
  opacity: 0.7;
}

/* Callout Box (Harmonious Ice Blue Container) */
.m3-callout {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  border: 1px solid rgba(168, 199, 250, 0.3);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}

.m3-callout-icon {
  font-size: 24px;
  color: var(--md-sys-color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.m3-callout h3 {
  font-family: var(--font-brand);
  font-size: 16px;
  font-weight: 700;
  color: var(--md-sys-color-primary);
  margin-bottom: 4px;
}

.m3-callout p {
  font-size: 14px;
  color: var(--md-sys-color-on-primary-container);
  line-height: 1.55;
  margin: 0;
}

/* Section Cards */
.m3-section-card {
  background-color: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 18px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.m3-section-card:hover {
  border-color: rgba(168, 199, 250, 0.3);
}

.m3-section-heading {
  font-family: var(--font-brand);
  font-size: 18px;
  font-weight: 700;
  color: var(--md-sys-color-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  padding-bottom: 12px;
  letter-spacing: -0.01em;
}

.m3-section-heading .material-symbols-rounded {
  font-size: 20px;
  color: var(--md-sys-color-primary);
}

p {
  font-size: 14.5px;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.6;
  margin-bottom: 14px;
}

ul {
  list-style: none;
  margin-bottom: 14px;
}

li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  font-size: 14.5px;
  color: var(--md-sys-color-on-surface-variant);
  line-height: 1.55;
}

li::before {
  content: '•';
  position: absolute;
  left: 8px;
  color: var(--md-sys-color-primary);
  font-size: 16px;
  line-height: 1;
}

code {
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-primary);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

a {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

a:hover {
  color: #FFFFFF;
}

/* Footer */
footer {
  background-color: var(--md-sys-color-surface-container-lowest);
  border-top: 1px solid var(--md-sys-color-outline-variant);
  padding: 32px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--md-sys-color-on-surface-variant);
  position: relative;
  z-index: 1;
}

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

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .m3-hero-card { padding: 24px 20px; border-radius: 18px; }
  .m3-hero-title { font-size: 24px; }
  .m3-section-card { padding: 20px; border-radius: 16px; }
  .m3-top-bar { padding: 0 16px; }
}