/* ============================================
   Android Engineer Blog - Main Stylesheet
   Android color palette + Modern Dark Design
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --android-green: #3DDC84;
  --android-green-dark: #00C853;
  --android-blue: #4285F4;
  --android-dark: #1C2128;
  --android-darker: #0D1117;
  --android-surface: #21262D;
  --android-surface-2: #2D333B;
  --android-border: #30363D;
  --android-text: #E6EDF3;
  --android-text-muted: #8B949E;
  --android-text-dim: #6E7681;
  --android-accent: #58A6FF;
  --android-warning: #F0883E;
  --android-error: #F85149;
  --android-metal: #C9D1D9;
  --android-glow: rgba(61, 220, 132, 0.4);
  --font-sans: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-metal: 'Metal Mania', cursive;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);
  --transition: 0.2s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background-color: var(--android-darker);
  color: var(--android-text);
  line-height: 1.75;
  min-height: 100vh;
}

a {
  color: var(--android-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--android-green); }

img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--android-darker); }
::-webkit-scrollbar-thumb { background: var(--android-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--android-green-dark); }

/* ---------- Site Header ---------- */
.site-header {
  background: var(--android-dark);
  border-bottom: 1px solid var(--android-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(28, 33, 40, 0.85);
}

.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-metal);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--android-text);
  letter-spacing: 1px;
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--android-green), var(--android-green-dark));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 0 16px rgba(61,220,132,0.3);
}

.site-logo:hover { color: var(--android-green); }

.site-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 16px rgba(61,220,132,0.3);
}

.site-nav { display: flex; align-items: center; gap: 0.5rem; }

.site-nav a {
  color: var(--android-text-muted);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.site-nav a:hover {
  color: var(--android-text);
  background: var(--android-surface);
}

/* ---------- Hero / Page Header ---------- */
.page-hero {
  background: linear-gradient(135deg, var(--android-dark) 0%, var(--android-surface) 100%);
  border-bottom: 1px solid var(--android-border);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(ellipse at center, rgba(61,220,132,0.08) 0%, transparent 60%),
    repeating-linear-gradient(45deg, rgba(61,220,132,0.02) 0px, rgba(61,220,132,0.02) 1px, transparent 1px, transparent 100px);
  pointer-events: none;
}

.page-hero h1 {
  font-family: var(--font-metal);
  font-size: clamp(3rem, 12vw, 6rem);
  font-weight: 400;
  letter-spacing: 2px;
  background: linear-gradient(135deg, var(--android-green), #fff, var(--android-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 0 25px rgba(61,220,132,0.3));
  text-transform: uppercase;
}

.page-hero p {
  color: var(--android-text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Main Content ---------- */
.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* ---------- Post Cards (Home) ---------- */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.post-card {
  background: var(--android-surface);
  border: 1px solid var(--android-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 0 0 var(--android-glow);
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--android-green), var(--android-accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.post-card:hover {
  border-color: var(--android-green);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(61,220,132,0.15);
  background: linear-gradient(135deg, var(--android-surface) 0%, var(--android-surface-2) 100%);
}

.post-card:hover::before { opacity: 1; }

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.post-date {
  font-size: 0.78rem;
  color: var(--android-text-dim);
  font-family: var(--font-mono);
}

.post-tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(61,220,132,0.12);
  color: var(--android-green);
  border: 1px solid rgba(61,220,132,0.25);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.post-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  letter-spacing: -0.3px;
}

.post-card h2 a { color: var(--android-text); }
.post-card h2 a:hover { color: var(--android-green); }

.post-card .excerpt {
  color: var(--android-text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--android-accent);
  transition: all var(--transition);
}
.read-more:hover { color: var(--android-green); gap: 0.6rem; }

/* ---------- Article Page ---------- */
.post-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr min(740px, 100%) 1fr;
}

.post-wrapper > * { grid-column: 2; }

.post-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--android-border);
}

.post-header .post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.post-header h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.25;
}

/* ---------- Post Body ---------- */
.post-body {
  font-size: 1.05rem;
  line-height: 1.85;
}

.post-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 3rem 0 1.25rem;
  padding: 0.5rem 0 0.5rem 1.25rem;
  border-left: 5px solid var(--android-green);
  background: linear-gradient(90deg, rgba(61,220,132,0.06) 0%, transparent 100%);
  color: var(--android-text);
  letter-spacing: -0.5px;
}

.post-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--android-accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.post-body h3::before {
  content: '>';
  color: var(--android-green);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.post-body p { margin-bottom: 1.4rem; }

.post-body ul, .post-body ol {
  margin-bottom: 1.4rem;
  padding-left: 1.75rem;
}
.post-body li { margin-bottom: 0.4rem; }

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--android-surface-2);
  padding: 0.15em 0.5em;
  border-radius: 4px;
  color: var(--android-green);
  border: 1px solid var(--android-border);
}

.post-body pre {
  background: var(--android-surface);
  border: 1px solid var(--android-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  position: relative;
}

.post-body pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: var(--android-text);
  font-size: 0.9rem;
}

.post-body blockquote {
  border-left: 4px solid var(--android-accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--android-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--android-text-muted);
  font-style: italic;
}

/* ---------- Metal Corner (メタルで聴く) ---------- */
.metal-corner {
  margin-top: 4rem;
  border: 1px solid rgba(61,220,132,0.4);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--android-dark) 0%, #000 100%);
  overflow: hidden;
  box-shadow: 0 0 50px rgba(61,220,132,0.12), var(--shadow-lg);
  position: relative;
}

.metal-corner::after {
  content: 'METAL';
  position: absolute;
  top: 10px;
  right: -30px;
  transform: rotate(45deg);
  background: var(--android-green);
  color: #000;
  font-size: 0.7rem;
  font-weight: 900;
  padding: 4px 40px;
  box-shadow: 0 0 15px var(--android-glow);
}

.metal-corner-header {
  background: linear-gradient(90deg, rgba(61,220,132,0.15), rgba(88,166,255,0.1));
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid rgba(61,220,132,0.2);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.metal-corner-header .metal-icon {
  font-size: 1.5rem;
  filter: drop-shadow(0 0 8px rgba(61,220,132,0.5));
}

.metal-corner-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--android-green);
  letter-spacing: 0.5px;
  margin: 0;
  border: none;
  padding: 0;
}

.metal-corner-header .metal-subtitle {
  font-size: 0.8rem;
  color: var(--android-text-muted);
  margin-left: auto;
}

.metal-corner-body { padding: 1.75rem; }

/* --- Metal Player Card --- */
.metal-player-card {
  position: relative;
  display: flex;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(61,220,132,0.06) 0%, rgba(0,0,0,0.4) 100%);
  border: 1px solid rgba(61,220,132,0.2);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
}

/* left accent stripe */
.metal-album-accent {
  width: 5px;
  flex-shrink: 0;
  background: linear-gradient(180deg, var(--android-green) 0%, var(--android-accent) 100%);
  box-shadow: 2px 0 12px rgba(61,220,132,0.4);
}

.metal-player-inner {
  flex: 1;
  padding: 1.4rem 1.5rem;
  min-width: 0;
}

.metal-track-info {
  margin-bottom: 1.25rem;
}

.metal-track-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  line-height: 1.2;
  margin-bottom: 0.6rem;
  background: linear-gradient(90deg, var(--android-text) 60%, var(--android-text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metal-genre-row {
  margin-bottom: 0.4rem;
}

.metal-genre-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(61,220,132,0.18), rgba(88,166,255,0.12));
  color: var(--android-green);
  border: 1px solid rgba(61,220,132,0.35);
  box-shadow: 0 0 8px rgba(61,220,132,0.15);
}

.metal-genre-reason {
  font-size: 0.82rem;
  color: var(--android-text-dim);
  line-height: 1.55;
  padding-left: 0.1rem;
}

.metal-coming-soon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem;
  color: var(--android-text-dim);
  font-size: 0.9rem;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-sm);
  border: 1px dashed var(--android-border);
}

/* --- Plyr theme overrides --- */
.metal-plyr-wrapper {
  --plyr-color-main: var(--android-green);
  --plyr-audio-controls-background: rgba(0,0,0,0.45);
  --plyr-audio-control-color: var(--android-text-muted);
  --plyr-audio-control-color-hover: var(--android-green);
  --plyr-range-fill-background: var(--android-green);
  --plyr-range-thumb-background: #fff;
  --plyr-range-thumb-shadow: 0 0 0 3px rgba(61,220,132,0.35), 0 1px 4px rgba(0,0,0,0.5);
  --plyr-range-track-height: 3px;
  --plyr-font-family: var(--font-sans);
  --plyr-font-size-time: 0.78rem;
  --plyr-control-spacing: 10px;
  --plyr-control-icon-size: 16px;
}

.metal-plyr-wrapper .plyr--audio .plyr__controls {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(61,220,132,0.15);
  padding: 0.5rem 0.75rem;
  gap: 0.25rem;
}

.metal-plyr-wrapper .plyr__time {
  color: var(--android-text-dim);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.metal-plyr-wrapper .plyr__volume input[type=range] {
  max-width: 80px;
}

.metal-lyrics {
  position: relative;
}

.metal-lyrics-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--android-text-dim);
  margin-bottom: 0.75rem;
}

.metal-lyrics-text {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 2;
  color: var(--android-text-muted);
  white-space: pre-line;
  padding: 1.25rem 1.5rem;
  background: rgba(0,0,0,0.25);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--android-green);
}

/* ---------- Tags Page ---------- */
.tags-page { max-width: 860px; margin: 0 auto; padding: 2rem 0; }

.page-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--android-text);
  margin-bottom: 1.5rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 3rem;
}

.tag-badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: var(--android-surface-2);
  border: 1px solid var(--android-border);
  border-radius: 2rem;
  color: var(--android-green);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s;
}

.tag-badge:hover {
  background: rgba(61,220,132,0.15);
  border-color: var(--android-green);
}

.tag-section { margin-bottom: 2.5rem; }

.tag-heading {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--android-green);
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--android-border);
  padding-bottom: 0.4rem;
}

.tag-section .post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tag-section .post-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(48,54,61,0.5);
}

.tag-section .post-date {
  color: var(--android-text-dim);
  font-size: 0.85rem;
  white-space: nowrap;
}

.tag-section .post-list a {
  color: var(--android-text);
  text-decoration: none;
}

.tag-section .post-list a:hover { color: var(--android-green); }

/* ---------- Tags / Labels ---------- */
.tags-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; }

/* ---------- Back Link ---------- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--android-text-muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--android-border);
  transition: all var(--transition);
}
.back-link:hover {
  color: var(--android-green);
  border-color: var(--android-green);
  background: rgba(61,220,132,0.05);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--android-dark);
  border-top: 1px solid var(--android-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--android-text-dim);
  font-size: 0.875rem;
}

.site-footer a { color: var(--android-text-muted); }
.site-footer a:hover { color: var(--android-green); }

.site-footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ---------- Syntax Highlight (Rouge) ---------- */
.highlight { background: var(--android-surface) !important; }
.highlight .c, .highlight .cm, .highlight .c1 { color: #6E7681; }
.highlight .k, .highlight .kd, .highlight .kn { color: #FF7B72; }
.highlight .s, .highlight .s1, .highlight .s2 { color: #A5D6FF; }
.highlight .nf { color: var(--android-green); }
.highlight .n, .highlight .na { color: var(--android-text); }
.highlight .nb { color: #FFA657; }
.highlight .mi, .highlight .mf { color: #79C0FF; }
.highlight .o, .highlight .p { color: var(--android-text-muted); }
.highlight .nn { color: #FFA657; }
.highlight .nc { color: #F0883E; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .posts-grid { grid-template-columns: 1fr; }

  .post-wrapper {
    grid-template-columns: 1fr;
    padding: 1.5rem 1rem;
  }

  .post-wrapper > * { grid-column: 1; }

  .site-header-inner { padding: 0 1rem; }

  .page-hero { padding: 2.5rem 1rem 2rem; }

  .metal-corner-header { flex-wrap: wrap; }
  .metal-corner-header .metal-subtitle { display: none; }
}

@media (max-width: 480px) {
  .post-card { padding: 1.25rem; }
  .main-content { padding: 2rem 1rem; }
}

/* ---------- About Page Custom Styles ---------- */
.about-hero {
  background: linear-gradient(135deg, #000 0%, var(--android-dark) 100%);
}

.about-hero h1 {
  background: linear-gradient(135deg, var(--android-accent), #fff, var(--android-green));
  -webkit-background-clip: text;
  background-clip: text;
}

.about-content {
  max-width: 900px;
}

.about-card-intro {
  background: var(--android-surface);
  border: 1px solid var(--android-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  box-shadow: var(--shadow-md);
  border-top: 4px solid var(--android-green);
}

.about-emoji {
  font-size: 3.5rem;
  display: block;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 0 15px var(--android-glow));
}

.about-card-intro h2 {
  font-size: 1.8rem;
  color: var(--android-text);
  margin-bottom: 1rem;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 4rem;
}

.about-section {
  background: rgba(255,255,255,0.03);
  padding: 2rem;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--android-accent);
}

.about-section h3 {
  color: var(--android-green);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.author-info-card {
  background: linear-gradient(to right, var(--android-surface), transparent);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--android-border);
}

.author-meta {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.author-avatar-large {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 3px solid var(--android-green);
  box-shadow: 0 0 20px var(--android-glow);
}

.author-text h4 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--android-text);
}

.github-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background: var(--android-surface-2);
  color: var(--android-text);
  border-radius: var(--radius-sm);
  font-weight: 600;
  border: 1px solid var(--android-border);
  transition: all 0.2s;
}

.github-btn:hover {
  background: var(--android-green);
  color: #000;
  border-color: var(--android-green);
  box-shadow: 0 0 15px var(--android-glow);
}

@media (max-width: 600px) {
  .about-grid { grid-template-columns: 1fr; }
  .author-meta { flex-direction: column; text-align: center; }
}

/* --- Glitch / Shake Effect for Metal Font --- */
@keyframes shake {
  0% { transform: translate(0,0) skew(0deg); }
  20% { transform: translate(-2px, 1px) skew(-0.5deg); }
  40% { transform: translate(2px, -1px) skew(0.5deg); }
  60% { transform: translate(-1px, 2px) skew(-0.3deg); }
  80% { transform: translate(1px, -2px) skew(0.3deg); }
  100% { transform: translate(0,0) skew(0deg); }
}

.site-logo:hover span, 
.page-hero h1:hover {
  animation: shake 0.15s infinite linear;
  color: #fff;
  text-shadow: 0 0 15px var(--android-green), 0 0 30px var(--android-accent);
}

.site-logo span,
.page-hero h1 {
  letter-spacing: 2px;
}

.page-hero h1 {
  transition: all 0.3s ease;
}

.page-hero h1 {
  transition: all 0.3s ease;
}