/* ==========================================
   fseasky.fun — 综合信息站样式 v2
   设计风格: Linear + Notion + Apple
   自动跟随系统深色/浅色模式
   ========================================== */

/* CSS Variables - Dark (default) */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-hover: #1e1e35;
  --bg-card: #141420;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-dim: rgba(99,102,241,0.12);
  --accent-glow: rgba(99,102,241,0.25);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --border: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.1);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.3), 0 0 1px rgba(255,255,255,0.05);
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --header-h: 56px;
  --sidebar-w: 200px;
  --mobile-nav-h: 56px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light theme - auto follow system */
@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f2;
    --bg-hover: #e8e8ed;
    --bg-card: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-muted: #aeaeb2;
    --border: rgba(0,0,0,0.08);
    --border-light: rgba(0,0,0,0.12);
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-card: 0 1px 4px rgba(0,0,0,0.06), 0 0 1px rgba(0,0,0,0.1);
    --accent-dim: rgba(99,102,241,0.08);
    --accent-glow: rgba(99,102,241,0.15);
  }
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}
a { color: var(--accent-light); text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: var(--accent); color: #fff; }

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Header ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  z-index: 200;
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  background: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
}
.header-inner {
  max-width: 100%; margin: 0 auto;
  height: 100%; padding: 0 20px 0 20px;
  display: flex; align-items: center; gap: 16px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 17px;
  color: var(--text-primary); flex-shrink: 0;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.8; }
.logo-icon {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #a855f7, #ec4899);
  color: #fff; display: flex; align-items: center;
  justify-content: center; font-weight: 800; font-size: 15px;
  box-shadow: 0 2px 12px rgba(99,102,241,0.3);
}
.search-box {
  flex: 1; max-width: 420px; position: relative;
}
.search-box input {
  width: 100%; padding: 8px 14px 8px 36px;
  background: var(--bg-tertiary); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text-primary);
  font-size: 13px; outline: none;
  transition: all var(--transition);
}
.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  background: var(--bg-hover);
}
.search-box input::placeholder { color: var(--text-muted); }
.search-icon {
  position: absolute; left: 11px; top: 50%;
  transform: translateY(-50%); color: var(--text-muted);
  pointer-events: none;
}
.header-actions { display: flex; gap: 4px; margin-left: auto; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.icon-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.icon-btn.active { color: var(--accent); background: var(--accent-dim); }

/* ===== Sidebar (Desktop) ===== */
.sidebar {
  position: fixed; top: var(--header-h); left: 0;
  width: var(--sidebar-w); bottom: 0;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  z-index: 150;
  overflow-y: auto;
  padding: 12px 10px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar-inner { display: flex; flex-direction: column; gap: 2px; }
.cat-btn {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 10px;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.cat-btn::before {
  content: ''; position: absolute;
  left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
  transform: scaleY(0);
  transition: transform var(--transition);
}
.cat-btn:hover {
  background: var(--bg-tertiary); color: var(--text-primary);
}
.cat-btn.active {
  background: var(--accent-dim);
  color: var(--accent-light);
  font-weight: 600;
}
.cat-btn.active::before { transform: scaleY(1); }
.cat-icon { font-size: 16px; width: 22px; text-align: center; }
.cat-label { white-space: nowrap; }

/* ===== Main Content ===== */
.main {
  margin-left: var(--sidebar-w);
  margin-top: var(--header-h);
  min-height: calc(100vh - var(--header-h));
  padding: 20px 24px 80px;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.container { max-width: 1100px; margin: 0 auto; }

.stats-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; padding: 0 4px;
  font-size: 12px; color: var(--text-muted);
  animation: fadeUp 0.4s ease;
}

/* Article Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}

/* Article Card */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  animation: fadeUp 0.4s ease backwards;
}
.article-card:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.article-card:active { transform: translateY(-1px) scale(0.995); }
.article-card::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), #a855f7, #ec4899);
  opacity: 0; transition: opacity 0.3s;
}
.article-card:hover::before { opacity: 1; }

/* Card shimmer effect on hover */
.article-card::after {
  content: ''; position: absolute;
  top: 0; left: -100%; width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent);
  transition: left 0.5s;
  pointer-events: none;
}
.article-card:hover::after { left: 100%; }

.card-meta {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 10px;
}
.card-tag {
  padding: 3px 10px; border-radius: 6px;
  font-size: 11px; font-weight: 600;
  background: var(--accent-dim); color: var(--accent-light);
  letter-spacing: 0.02em;
}
.card-tag[data-cat="side-project"] { background: rgba(16,185,129,0.12); color: #34d399; }
.card-tag[data-cat="solo-company"] { background: rgba(245,158,11,0.12); color: #fbbf24; }
.card-tag[data-cat="finance"] { background: rgba(239,68,68,0.12); color: #f87171; }
.card-tag[data-cat="world-news"] { background: rgba(59,130,246,0.12); color: #60a5fa; }
.card-tag[data-cat="social"] { background: rgba(20,184,166,0.12); color: #2dd4bf; }
.card-tag[data-cat="frontier"] { background: rgba(249,115,22,0.12); color: #fb923c; }
.card-tag[data-cat="growth"] { background: rgba(168,85,247,0.12); color: #c084fc; }
.card-tag[data-cat="investment"] { background: rgba(236,72,153,0.12); color: #f472b6; }
.card-time { font-size: 11px; color: var(--text-muted); margin-left: auto; }

.card-title {
  font-size: 15px; font-weight: 600;
  color: var(--text-primary);
  line-height: 1.55; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
  letter-spacing: -0.01em;
}
.card-summary {
  font-size: 13px; color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 12px;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}

.card-extra {
  display: flex; gap: 8px; margin-bottom: 10px;
  flex-wrap: wrap;
}
.extra-badge {
  padding: 3px 8px; border-radius: 6px;
  font-size: 11px; font-weight: 500;
  background: var(--bg-tertiary); color: var(--text-secondary);
}
.extra-badge.green { background: rgba(16,185,129,0.12); color: #34d399; }
.extra-badge.yellow { background: rgba(245,158,11,0.12); color: #fbbf24; }
.extra-badge.blue { background: rgba(59,130,246,0.12); color: #60a5fa; }

.card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 10px; border-top: 1px solid var(--border);
}
.card-source { font-size: 11px; color: var(--text-muted); }
.card-read-hint {
  font-size: 11px; color: var(--accent-light);
  opacity: 0; transition: opacity var(--transition);
  display: flex; align-items: center; gap: 4px;
}
.article-card:hover .card-read-hint { opacity: 1; }

/* ===== Reader Panel ===== */
.reader-panel {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  z-index: 300;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}
.reader-panel.open {
  pointer-events: all;
  opacity: 1;
}
.reader-overlay {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.reader-content {
  position: absolute; right: 0; top: 0; bottom: 0;
  width: 100%; max-width: 680px;
  background: var(--bg-secondary);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 32px rgba(0,0,0,0.3);
}
.reader-panel.open .reader-content {
  transform: translateX(0);
}
.reader-header {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px;
  background: color-mix(in srgb, var(--bg-secondary) 85%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}
.reader-back {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500;
  color: var(--accent-light);
  padding: 6px 10px; border-radius: 8px;
  transition: all var(--transition);
}
.reader-back:hover { background: var(--accent-dim); }
.reader-actions { display: flex; gap: 6px; }
.reader-action-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 6px 12px; border-radius: 8px;
  font-size: 12px; color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.reader-action-btn:hover {
  color: var(--accent-light);
  border-color: var(--accent);
  background: var(--accent-dim);
}
.reader-body { padding: 28px 24px 60px; }
.reader-meta {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px;
}
.reader-time { font-size: 12px; color: var(--text-muted); }
.reader-title {
  font-size: 24px; font-weight: 700;
  line-height: 1.4; margin-bottom: 20px;
  letter-spacing: -0.02em;
  animation: fadeUp 0.4s ease 0.1s backwards;
}
.reader-summary {
  font-size: 15px; color: var(--text-secondary);
  line-height: 1.85; margin-bottom: 24px;
  animation: fadeUp 0.4s ease 0.15s backwards;
}
.reader-extra {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 20px;
  animation: fadeUp 0.4s ease 0.2s backwards;
}
.reader-full-content {
  font-size: 15px; color: var(--text-primary);
  line-height: 1.85; margin-bottom: 24px;
  animation: fadeUp 0.4s ease 0.25s backwards;
}
.reader-full-content p { margin-bottom: 16px; }
.reader-source {
  padding-top: 16px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-muted);
  animation: fadeUp 0.4s ease 0.3s backwards;
}

/* ===== Audio Player ===== */
.audio-player {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: 52px; z-index: 250;
  background: color-mix(in srgb, var(--bg-secondary) 90%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--border);
}
.player-inner {
  max-width: 100%; margin: 0 auto;
  height: 100%; padding: 0 20px;
  display: flex; align-items: center; gap: 14px;
}
.player-info { flex: 1; min-width: 0; }
.player-title {
  font-size: 13px; font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; display: block;
}
.player-controls { display: flex; align-items: center; gap: 10px; }
.player-btn {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-primary);
  transition: all var(--transition);
}
.player-btn:hover { background: var(--bg-tertiary); }
.player-progress {
  width: 100px; height: 3px;
  background: var(--border); border-radius: 2px;
  overflow: hidden;
}
.progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), #a855f7);
  border-radius: 2px;
  transition: width 0.3s;
}
.player-close { width: 24px; height: 24px; }

/* ===== Mobile Nav ===== */
.mobile-nav {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--mobile-nav-h);
  background: color-mix(in srgb, var(--bg-secondary) 90%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--border);
  z-index: 200;
}
.mobile-nav-btn {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2px; color: var(--text-muted);
  font-size: 10px; font-weight: 500;
  transition: all var(--transition);
  position: relative;
}
.mobile-nav-btn::before {
  content: ''; position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px;
  background: var(--accent);
  border-radius: 0 0 2px 2px;
  opacity: 0; transition: opacity var(--transition);
}
.mobile-nav-btn.active { color: var(--accent); }
.mobile-nav-btn.active::before { opacity: 1; }

/* More menu */
.more-menu {
  display: none; position: fixed;
  bottom: var(--mobile-nav-h); left: 0; right: 0;
  background: color-mix(in srgb, var(--bg-secondary) 95%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--border);
  padding: 14px; z-index: 199;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.more-menu.show {
  display: block;
  transform: translateY(0);
}
.more-menu-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.more-menu-btn {
  padding: 14px 8px; border-radius: 12px;
  display: flex; flex-direction: column;
  align-items: center; gap: 6px;
  font-size: 12px; font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  transition: all var(--transition);
}
.more-menu-btn:hover, .more-menu-btn.active {
  background: var(--accent-dim); color: var(--accent-light);
}
.more-menu-btn span { font-size: 20px; }

/* Loading */
.loading {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 80px 20px; color: var(--text-muted);
}
.loading-spinner {
  width: 28px; height: 28px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-bottom: 14px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center; padding: 80px 20px;
  color: var(--text-muted);
  animation: fadeUp 0.4s ease;
}
.empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state p { font-size: 15px; }
.empty-state .sub { font-size: 13px; margin-top: 6px; }

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main { margin-left: 0; padding: 12px 12px calc(var(--mobile-nav-h) + 16px); }
  .container { max-width: 100%; }
  .header-inner { padding: 0 12px; }
  .logo-text { display: none; }
  .search-box { max-width: none; }
  .mobile-nav { display: flex; }
  .audio-player { bottom: var(--mobile-nav-h); }
  .article-grid { grid-template-columns: 1fr; gap: 10px; }
  .article-card { padding: 14px; border-radius: 12px; }
  .card-title { font-size: 14px; }
  .reader-content { max-width: 100%; }
  .reader-title { font-size: 20px; }
  .reader-body { padding: 20px 16px 40px; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .sidebar { width: 160px; }
  .main { margin-left: 160px; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-label { font-size: 12px; }
}

@media (min-width: 1025px) {
  .article-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
}

/* Accessibility: reduce motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}