:root {
            --ink: #1a1a1a;
            --warm-white: #faf9f6;
            --cream: #f7f5f0;
            --gold: #b8956d;
            --ink-soft: #4a4a48;
            --grey: #76746e;
            --line: #e6e3dc;
            --accent: #2c4a6b;
        }

[data-theme="dark"] {
            --ink: #e8e5df;
            --warm-white: #1a1a1a;
            --cream: #2d2d2d;
            --gold: #d4b896;
            --ink-soft: #b0aca6;
            --grey: #888480;
            --line: #404040;
            --accent: #7aa0c8;
        }

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

body {
            font-family: 'Inter', sans-serif;
            background: var(--warm-white);
            color: var(--ink);
            line-height: 1.6;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

.reader-header {
            background: var(--cream);
            padding: 1rem 0;
            border-bottom: 1px solid var(--line);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
        }

.reader-header .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

.back-link {
            color: var(--ink-soft);
            text-decoration: none;
            font-size: 0.85rem;
            letter-spacing: 0.02em;
            transition: color 0.3s ease;
        }

.back-link:hover { color: var(--gold); }

.book-title {
            font-family: 'Crimson Text', serif;
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--ink);
        }

.reader-controls {
            max-width: 800px;
            margin: 0 auto;
            padding: 1.2rem 2rem;
            background: var(--cream);
            border-bottom: 1px solid var(--line);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }

.chapter-nav {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

.nav-btn {
            background: transparent;
            border: 1px solid var(--line);
            color: var(--ink-soft);
            padding: 0.45rem 0.9rem;
            cursor: pointer;
            font-size: 0.82rem;
            font-family: inherit;
            letter-spacing: 0.02em;
            border-radius: 2px;
            transition: all 0.2s ease;
        }

.nav-btn:hover:not(:disabled) {
            border-color: var(--ink);
            color: var(--ink);
        }

.nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.chapter-indicator {
            font-size: 0.82rem;
            color: var(--grey);
            letter-spacing: 0.04em;
            min-width: 90px;
            text-align: center;
        }

.font-controls {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

.font-btn {
            background: transparent;
            border: 1px solid var(--line);
            color: var(--ink-soft);
            width: 30px;
            height: 30px;
            cursor: pointer;
            font-family: inherit;
            border-radius: 2px;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

.font-btn:hover { border-color: var(--ink); color: var(--ink); }

.theme-btn {
            background: transparent;
            border: 1px solid var(--line);
            color: var(--ink-soft);
            padding: 0.45rem 0.8rem;
            cursor: pointer;
            font-size: 0.78rem;
            font-family: inherit;
            border-radius: 2px;
            letter-spacing: 0.04em;
            transition: all 0.2s ease;
        }

.theme-btn:hover { border-color: var(--ink); color: var(--ink); }

.chapter-content {
            max-width: 680px;
            margin: 0 auto;
            padding: 3.5rem 2rem 5rem;
            font-family: 'Crimson Text', serif;
            font-size: 1.18rem;
            line-height: 1.85;
            color: var(--ink);
        }

.chapter-content h1 {
            font-family: 'Crimson Text', serif;
            font-size: 2rem;
            font-weight: 400;
            text-align: center;
            letter-spacing: 0.1em;
            margin-bottom: 3rem;
            color: var(--ink);
        }

.chapter-content p {
            text-indent: 1.8em;
            margin-bottom: 0;
        }

.chapter-content p.no-indent {
            text-indent: 0;
            margin-top: 0.2em;
        }

.chapter-content p + p { margin-top: 0; }

.scene-break {
            text-align: center;
            margin: 2rem 0;
            color: var(--gold);
            font-size: 1.1rem;
        }

.chapter-nav-bottom {
            max-width: 680px;
            margin: 0 auto;
            padding: 2rem 2rem 5rem;
            display: flex;
            justify-content: space-between;
            border-top: 1px solid var(--line);
        }

.chapter-nav-bottom .nav-btn { padding: 0.6rem 1.2rem; }

.progress-bar {
            height: 2px;
            background: var(--line);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 200;
        }

.progress-fill {
            height: 100%;
            background: var(--gold);
            transition: width 0.3s ease;
        }

@media (max-width: 600px) {
            .chapter-content { padding: 2.5rem 1.5rem 4rem; font-size: 1.08rem; }
            .reader-controls { padding: 1rem 1.5rem; }
            .book-title { font-size: 1rem; }
        }