/* === Dark theme (default) === */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: #161b22;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-orange: #d29922;
    --accent-purple: #bc8cff;
    --radius: 6px;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --shadow: 0 4px 16px rgba(0,0,0,0.3);
}

/* === Light theme === */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-tertiary: #eaeef2;
    --bg-card: #ffffff;
    --border: #d0d7de;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --text-muted: #8b949e;
    --accent-blue: #0969da;
    --accent-green: #1a7f37;
    --accent-red: #cf222e;
    --accent-orange: #9a6700;
    --accent-purple: #8250df;
    --shadow: 0 4px 16px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background 0.2s, color 0.2s;
}

a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Shared Nav --- */
.top-bar {
    display: flex;
    align-items: center;
    padding: 0 20px;
    height: 52px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    gap: 16px;
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 700;
    color: var(--accent-blue);
    white-space: nowrap;
    text-decoration: none;
}
.logo:hover { text-decoration: none; opacity: 0.9; }
.logo i { font-size: 18px; }

.nav-links {
    display: flex;
    gap: 4px;
    flex: 1;
}
.nav-links a {
    padding: 6px 14px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.15s;
}
.nav-links a:hover { background: var(--bg-tertiary); color: var(--text-primary); text-decoration: none; }
.nav-links a.active { background: var(--bg-tertiary); color: var(--text-primary); }

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    outline: none;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}
.btn:hover { background: var(--border); }
.btn-primary { background: var(--accent-green); color: #fff; border-color: var(--accent-green); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-icon {
    width: 34px; height: 34px; padding: 0;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-tertiary); border: 1px solid var(--border);
    border-radius: var(--radius); color: var(--text-secondary);
    cursor: pointer; font-size: 14px; transition: all 0.15s;
}
.btn-icon:hover { background: var(--border); color: var(--text-primary); }

.btn-small {
    background: none; border: none; color: var(--text-secondary);
    cursor: pointer; padding: 4px; font-size: 12px;
}
.btn-small:hover { color: var(--text-primary); }

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }