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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2333;
  --bg-card-hover: #242d42;
  --accent: #00B4D8;
  --accent-purple: #8B5CF6;
  --accent-glow: rgba(0, 180, 216, 0.12);
  --accent-text: #56d4f0;
  --accent-purple-glow: rgba(139, 92, 246, 0.15);
  --accent-amber: #F59E0B;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --border: #30363d;
  --border-accent: #00B4D8;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-accent: 0 0 20px rgba(0, 180, 216, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.25s ease;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--accent-text);
  text-shadow: 0 0 8px var(--accent-glow);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Navigation ===== */
.navbar {
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
}
.logo:hover {
  color: var(--accent-text);
  text-shadow: 0 0 12px var(--accent-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  box-shadow: 0 0 6px var(--accent);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text);
}
.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
  border-radius: 2px;
}

/* ===== Hero Section ===== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--bg-primary) 0%, #0f1a24 50%, var(--bg-secondary) 100%);
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 180, 216, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 180, 216, 0.03) 1px, transparent 1px),
    radial-gradient(ellipse at 50% 0%, rgba(0, 180, 216, 0.06) 0%, transparent 60%);
  background-size: 60px 60px, 60px 60px, 100% 100%;
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple);
  padding: 5px 14px;
  border-radius: 4px;
  background: rgba(139, 92, 246, 0.08);
  margin-bottom: 20px;
  box-shadow: 0 0 20px var(--accent-purple-glow);
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.25;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

/* Hero Stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 32px;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.daily-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 4px;
  margin-top: 8px;
}

/* ===== Daily News Section ===== */
.daily-section {
  padding: 60px 0 40px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.daily-loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.daily-error {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.loader {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.daily-grid {
  display: grid;
  gap: 12px;
  max-width: 800px;
  margin: 0 auto;
}

.daily-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: var(--transition);
  cursor: pointer;
}

.daily-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
  transform: translateX(4px);
}

.daily-rank {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  min-width: 28px;
  padding-top: 2px;
  text-align: right;
}

.daily-item.top-three .daily-rank {
  color: var(--accent);
  font-weight: 600;
}

.daily-content {
  flex: 1;
  min-width: 0;
}

.daily-content h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.4;
}

.daily-content p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.daily-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.daily-source {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: rgba(139, 148, 158, 0.1);
  padding: 2px 8px;
  border-radius: 3px;
}

.daily-tag {
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(0, 180, 216, 0.08);
  padding: 2px 8px;
  border-radius: 3px;
}

/* ===== Skills Showcase ===== */
.skills-showcase {
  padding: 60px 0 80px;
  background: var(--bg-secondary);
  scroll-margin-top: 80px;
}

.skills-showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.skills-showcase-footer {
  text-align: center;
  margin-top: 28px;
}

.showcase-all-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-purple);
  padding: 10px 24px;
  border: 1px solid var(--accent-purple);
  border-radius: 6px;
  background: rgba(139, 92, 246, 0.06);
  transition: var(--transition);
}
.showcase-all-link:hover {
  background: rgba(139, 92, 246, 0.15);
  box-shadow: 0 0 20px var(--accent-purple-glow);
  color: var(--accent-purple);
  text-shadow: none;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.showcase-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-purple);
  box-shadow: 0 0 24px var(--accent-purple-glow), var(--shadow-md);
}

.showcase-card-icon {
  font-size: 1.6rem;
  margin-bottom: 10px;
  display: block;
}

.showcase-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.showcase-card p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  flex: 1;
}

.showcase-card .showcase-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: auto;
}

.showcase-card .showcase-tags span {
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(0, 180, 216, 0.08);
  padding: 2px 7px;
  border-radius: 3px;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand h3 {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 12px;
  font-weight: 600;
}
.footer-links a {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}
.footer-bottom p {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-bottom a {
  color: var(--text-muted);
}
.footer-bottom a:hover {
  color: var(--accent);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  z-index: 999;
}
.back-to-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}

/* ===== About Page ===== */
.page-header {
  padding: 60px 0 40px;
  text-align: center;
}
.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.page-header p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.about-content {
  padding: 0 0 60px;
}
.about-section {
  margin-bottom: 40px;
}
.about-section h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.about-section p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.about-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.about-item h3 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 4px;
}
.about-item p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ===== Subscribe Section ===== */
.subscribe-section {
  padding: 48px 0;
  background: var(--bg-primary);
}

.subscribe-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  background: linear-gradient(135deg, rgba(0, 180, 216, 0.06), rgba(13, 116, 119, 0.06));
  border: 1px solid rgba(0, 180, 216, 0.2);
  border-radius: var(--radius);
  padding: 32px 40px;
}

.subscribe-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.subscribe-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 400px;
  line-height: 1.6;
  margin: 0;
}

.subscribe-actions {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.subscribe-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}

.rss-btn {
  background: rgba(0, 180, 216, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
}
.rss-btn:hover {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 16px var(--accent-glow);
  text-shadow: none;
}

.email-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.email-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Nav RSS ===== */
.nav-rss {
  font-family: var(--font-mono);
  font-size: 0.78rem !important;
  padding: 4px 10px !important;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: rgba(0, 180, 216, 0.06);
}
.nav-rss:hover {
  border-color: var(--accent) !important;
  background: rgba(0, 180, 216, 0.12) !important;
}
.nav-rss::after {
  display: none !important;
}

/* ===== Editor's Pick Badge ===== */
.daily-item.editor-pick {
  border-left: 3px solid var(--accent);
  background: rgba(0, 180, 216, 0.04);
}

.pick-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(0, 180, 216, 0.1);
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 500;
}

/* ===== Footer subscription links ===== */
.footer-links a.nav-rss {
  display: inline;
  border: none;
  background: none;
  padding: 0 !important;
}

@media (max-width: 768px) {
  .subscribe-box {
    flex-direction: column;
    text-align: center;
    padding: 24px 20px;
  }
  .subscribe-content p {
    max-width: 100%;
  }
  .subscribe-actions {
    width: 100%;
  }
  .subscribe-btn {
    flex: 1;
    justify-content: center;
  }
}


/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .hero { padding: 60px 0 40px; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    flex-direction: column;
    gap: 0;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid var(--border);
  }
  .hamburger { display: flex; }
  .subcategories-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .daily-grid {
    max-width: 100%;
  }
  .section-tabs {
    width: 100%;
  }
  .tab-btn {
    flex: 1;
    text-align: center;
    padding: 10px 12px;
    font-size: 0.8rem;
  }
  .hero h1 { font-size: 1.6rem; }
  .hero-stats { gap: 24px; }
  .stat-num { font-size: 1.2rem; }
  .skills-showcase-grid {
    grid-template-columns: 1fr;
  }
}