:root {
      --bg-deep: #050810; --bg-surface: #0a0f1a; --bg-elevated: #111827;
      --coral-bright: #ff4d4d; --coral-dark: #991b1b;
      --cyan-bright: #00e5cc; --cyan-glow: rgba(0,229,204,0.4);
      --text-primary: #f0f4ff; --text-secondary: #8892b0; --text-muted: #5a6480;
      --border-subtle: rgba(136,146,176,0.15); --border-accent: rgba(255,77,77,0.3);
      --surface-card: rgba(10,15,26,0.65); --surface-card-strong: rgba(10,15,26,0.85);
      --surface-interactive: rgba(255,255,255,0.06);
      --shadow-coral-soft: rgba(255,77,77,0.15); --shadow-coral-mid: rgba(255,77,77,0.28);
      --logo-gradient-start: #ff4d4d; --logo-gradient-end: #991b1b;
      --font-display: 'Clash Display', system-ui, sans-serif;
      --font-body: 'Satoshi', system-ui, sans-serif;
    }
    html[data-theme='light'] {
      --bg-deep: #fcfeff; --bg-surface: #ffffff; --bg-elevated: #f5f9ff;
      --coral-bright: #ef4b58; --coral-dark: #c43645;
      --cyan-bright: #008f87;
      --text-primary: #0b1220; --text-secondary: #2e405c; --text-muted: #5f7290;
      --border-subtle: rgba(15,23,42,0.16); --border-accent: rgba(239,75,88,0.34);
      --surface-card: rgba(255,255,255,0.92); --surface-card-strong: rgba(255,255,255,0.98);
      --surface-interactive: rgba(15,23,42,0.06);
      --logo-gradient-start: #ff7079; --logo-gradient-end: #ea4c59;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-body); background: var(--bg-deep); color: var(--text-primary);
      line-height: 1.6; min-height: 100vh; -webkit-font-smoothing: antialiased;
    }
    html[data-theme='light'] body {
      background:
        radial-gradient(1200px circle at 12% -10%, rgba(224,53,67,0.05), transparent 58%),
        radial-gradient(900px circle at 88% -12%, rgba(0,143,135,0.06), transparent 56%),
        var(--bg-deep);
    }
    a { color: var(--coral-bright); text-decoration: none; }
    .container { max-width: 1180px; margin: 0 auto; padding: 32px 24px 80px; }
    .topbar { display: flex; align-items: center; justify-content: space-between; padding: 4px 0 24px; gap: 16px; }
    .brand {
      display: flex; align-items: center; gap: 12px;
      font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
      color: var(--text-primary);
    }
    .brand-mark { width: 36px; height: 36px; filter: drop-shadow(0 0 12px var(--shadow-coral-soft)); }
    .accent {
      background: linear-gradient(135deg, var(--coral-bright), var(--coral-dark));
      -webkit-background-clip: text; background-clip: text; color: transparent;
    }
    .back-link {
      color: var(--text-secondary); padding: 8px 14px; border-radius: 999px;
      transition: color 0.2s, background 0.2s;
    }
    .back-link:hover { color: var(--text-primary); background: var(--surface-interactive); }

    .hero { text-align: center; padding: 24px 0 36px; }
    .hero h1 {
      font-family: var(--font-display); font-weight: 700;
      font-size: clamp(2rem, 5vw, 3rem); line-height: 1.1;
      letter-spacing: -0.02em; margin-bottom: 10px;
    }
    .hero h1 .accent {
      background: linear-gradient(135deg, var(--coral-bright), var(--coral-dark));
      -webkit-background-clip: text; background-clip: text; color: transparent;
    }
    .hero .lead { color: var(--text-secondary); max-width: 600px; margin: 0 auto 18px; }
    .hero .stats { display: inline-flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
    .pill {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 6px 14px; border-radius: 999px;
      font-size: 0.82rem; font-weight: 500;
      border: 1px solid var(--border-subtle); background: var(--surface-card);
      color: var(--text-secondary); backdrop-filter: blur(10px);
    }
    .pill strong { color: var(--text-primary); font-weight: 600; }

    .past-month { margin-bottom: 36px; }
    .past-month-head {
      display: flex; align-items: baseline; gap: 12px;
      margin-bottom: 14px; padding-bottom: 8px;
      border-bottom: 1px dashed var(--border-subtle);
    }
    .past-month-head h2 { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; letter-spacing: -0.01em; }
    .past-month-head .count { font-size: 0.85rem; color: var(--text-muted); }

    .past-grid {
      display: grid; gap: 16px;
      grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    }
    .past-card {
      display: flex; flex-direction: column;
      border: 1px solid var(--border-subtle);
      border-radius: 14px; overflow: hidden;
      background: var(--surface-card); backdrop-filter: blur(10px);
      transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
      color: inherit;
      opacity: 0.85;
    }
    .past-card:hover {
      transform: translateY(-2px); opacity: 1;
      border-color: var(--border-accent);
      box-shadow: 0 12px 28px -12px var(--shadow-coral-mid);
    }
    .past-hero {
      width: 100%; aspect-ratio: 16 / 9;
      background-size: cover; background-position: center;
      background-color: var(--bg-elevated);
      filter: grayscale(0.2);
    }
    .past-card:hover .past-hero { filter: none; }
    .past-body { padding: 14px 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
    .past-date { display: flex; align-items: baseline; gap: 8px; }
    .past-date strong {
      font-family: var(--font-display); font-weight: 700;
      font-size: 1.4rem; color: var(--text-muted); line-height: 1;
    }
    .past-date span { font-size: 0.85rem; color: var(--text-muted); }
    .past-card h3 {
      font-family: var(--font-display); font-weight: 600;
      font-size: 1rem; line-height: 1.3; color: var(--text-primary);
    }
    .past-loc { font-size: 0.88rem; color: var(--text-secondary); }
    .past-meta {
      display: flex; flex-wrap: wrap; gap: 10px;
      margin-top: auto; padding-top: 6px;
      font-size: 0.78rem; color: var(--text-muted);
    }
    .past-meta span:not(:last-child)::after {
      content: '·'; margin-left: 10px; color: var(--border-subtle);
    }

    footer {
      margin-top: 64px; padding-top: 24px;
      border-top: 1px solid var(--border-subtle);
      color: var(--text-muted); font-size: 0.85rem;
      display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
    }
    footer a { color: var(--text-secondary); }
    footer a:hover { color: var(--coral-bright); }