:root {
    --bg: #ffffff;
    --fg: #1a1a1a;
    --sidebar-bg: #f8fafc;
    --border: #e2e8f0;
    --accent: #3b82f6;
    --sb-thumb: #cbd5e1;
    --sb-track: #f1f5f9;
}

.dark {
    --bg: #121212;
    --fg: #e0e0e0;
    --sidebar-bg: #1a1a1a;
    --border: #2a2a2a;
    --accent: #a0a0a0;
    --sb-thumb: #333333;
    --sb-track: #121212;
}

.cobalt {
    --bg: #1e293b;
    --fg: #f1f5f9;
    --sidebar-bg: #0f172a;
    --border: #334155;
    --accent: #94a3b8;
    --sb-thumb: #475569;
    --sb-track: #1e293b;
}

.midnight {
    --bg: #000000;
    --fg: #ffffff;
    --sidebar-bg: #000000;
    --border: #111111;
    --accent: #ffffff;
    --sb-thumb: #222222;
    --sb-track: #000000;
}

.ivory {
    --bg: #ffffff;
    --fg: #1a1a1a;
    --sidebar-bg: #fdfaf3;
    --border: #d4af37;
    --accent: #d4af37;
    --sb-thumb: #cfb53b;
    --sb-track: #ffffff;
}

.page-divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border), transparent);
    margin: 40px 0;
}

.content-end {
    margin-top: 60px;
    margin-bottom: 20px;
}

.surprise-button {
    background: none;
    border: 1px solid var(--border);
    color: var(--fg);
    padding: 10px 20px;
    font-family: 'Playfair Display', serif;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 4px;
}

.surprise-button:hover {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.terminal {
    --bg: #000000;
    --fg: #00ff00;
    --sidebar-bg: #0a0a0a;
    --border: #003300;
    --accent: #00ff00;
    --sb-thumb: #003300;
    --sb-track: #000000;
    font-family: 'Courier New', Courier, monospace !important;
}

.terminal * {
    font-family: 'Courier New', Courier, monospace !important;
}

.sepia {
    --bg: #f4ecd8;
    --fg: #433422;
    --sidebar-bg: #eaddc0;
    --border: #d3c2a3;
    --accent: #92400e;
    --sb-thumb: #c2b291;
    --sb-track: #eaddc0;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background-color: var(--bg);
    color: var(--fg);
    font-family: 'Libre Baskerville', serif;
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--sb-track); }
::-webkit-scrollbar-thumb { background: var(--sb-thumb); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

#header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 64px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.header-left { display: flex; align-items: center; gap: 16px; }
.logo { font-family: 'Playfair Display', serif; font-size: 1.5rem; margin: 0; }
.icon-btn { background: none; border: none; cursor: pointer; color: inherit; padding: 8px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.icon-btn:hover { background: var(--sb-track); }

.layout { display: flex; padding-top: 64px; height: 100vh; }

#sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 24px;
}

.nav-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.6;
    margin-bottom: 12px;
}

.nav-group ul { list-style: none; padding: 0; margin: 0 0 32px 0; }
.nav-group li { margin-bottom: 8px; }
.nav-group a { text-decoration: none; color: inherit; display: block; padding: 4px 0; transition: color 0.2s; }
.nav-group a:hover, .nav-group a.active { color: var(--accent); }

#main { flex: 1; overflow-y: auto; padding: 48px; }
#content { max-width: 800px; margin: 0 auto; transition: opacity 0.3s ease; }
#quotes-container { max-width: 800px; margin: 0 auto; }
.quote-card { font-size: 1.1rem; text-align: center; }

.dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 48px;
    background: var(--sidebar-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 140px;
}
.dropdown.show { display: block; }
.theme-option { padding: 12px 16px; cursor: pointer; display: flex; align-items: center; gap: 8px; }
.theme-option:hover { background: var(--accent); color: white; }

h1, h2, h3 { font-family: 'Playfair Display', serif; }
.drop-cap::first-letter {
    float: left;
    font-size: 4rem;
    line-height: 3rem;
    padding-right: 8px;
    font-weight: bold;
}

@media (max-width: 768px) {
    #sidebar { position: fixed; left: -260px; z-index: 90; height: calc(100vh - 64px); transition: left 0.3s; }
    #sidebar.open { left: 0; }
    #main { padding: 24px; }
}