:root {
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #2c3e50;
    --text-secondary: #7f8c8d;
    --primary: #3498db;
    --primary-hover: #2980b9;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --border: #e1e8ed;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --radius: 10px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Nav */
#navbar {
    position: sticky; top: 0; z-index: 100;
    background: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; height: 60px;
}
.nav-brand { font-size: 20px; font-weight: 700; cursor: pointer; }
.nav-links { display: flex; gap: 20px; }
.nav-links a { cursor: pointer; color: var(--text-secondary); font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }

/* Main */
#app { max-width: 1200px; margin: 0 auto; padding: 24px; }

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 16px;
    transition: transform 0.2s;
}
.card:hover { transform: translateY(-2px); }
.card-clickable { cursor: pointer; }

/* Novel Grid */
.novel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.novel-card { text-align: center; padding: 24px 16px; }
.novel-card .cover {
    width: 100%; aspect-ratio: 3/4; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px; margin-bottom: 12px; display: flex; align-items: center; justify-content: center;
    font-size: 48px; color: white; overflow: hidden;
}
.novel-card .cover img { width: 100%; height: 100%; object-fit: cover; }
.novel-card h3 { font-size: 16px; margin-bottom: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.novel-card .meta { font-size: 13px; color: var(--text-secondary); }
.novel-card .status-tag {
    display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px; margin-top: 8px;
}
.status-0 { background: #e8f5e9; color: #2e7d32; }
.status-1 { background: #e3f2fd; color: #1565c0; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 18px; border-radius: 8px; border: none;
    font-size: 14px; font-weight: 500; cursor: pointer;
    transition: all 0.2s;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #c0392b; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 14px; border: 1px solid var(--border);
    border-radius: 8px; font-size: 14px; font-family: inherit;
    transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* Tabs */
.tabs {
    display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 20px;
}
.tab {
    padding: 10px 24px; cursor: pointer; font-weight: 500; color: var(--text-secondary);
    border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all 0.2s;
}
.tab:hover { color: var(--primary); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Chapter list */
.chapter-list { list-style: none; }
.chapter-list li {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 16px; border-bottom: 1px solid var(--border);
    transition: background 0.2s; cursor: pointer;
}
.chapter-list li:hover { background: #f5f7fa; }
.chapter-list li .title { font-weight: 500; }
.chapter-list li .meta { font-size: 13px; color: var(--text-secondary); }
.draft-tag { background: #fff3e0; color: #e65100; padding: 2px 6px; border-radius: 4px; font-size: 12px; }

/* Reading mode */
.reading-mode {
    max-width: 800px; margin: 0 auto; padding: 40px 20px;
}
.reading-mode .chapter-title {
    font-size: 28px; font-weight: 700; text-align: center; margin-bottom: 32px;
}
.reading-mode .chapter-content {
    font-size: 18px; line-height: 2; white-space: pre-wrap;
}
.reading-nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 0; margin-top: 40px; border-top: 1px solid var(--border);
}

/* Character grid */
.character-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px;
}
.character-card { display: flex; gap: 16px; }
.character-card .avatar {
    width: 64px; height: 64px; border-radius: 50%;
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; flex-shrink: 0;
}
.character-card .info h4 { margin-bottom: 4px; }
.character-card .info p { font-size: 13px; color: var(--text-secondary); }

/* Worldview */
.worldview-group { margin-bottom: 24px; }
.worldview-group h3 {
    font-size: 16px; color: var(--primary); margin-bottom: 12px;
    padding-bottom: 8px; border-bottom: 1px dashed var(--border);
}

/* Foreshadowing */
.foreshadowing-item {
    display: flex; gap: 16px; align-items: flex-start;
}
.importance-bar {
    display: flex; gap: 2px; margin-top: 4px;
}
.importance-bar .dot {
    width: 8px; height: 8px; border-radius: 50%; background: var(--border);
}
.importance-bar .dot.filled { background: var(--warning); }
.foreshadowing-status {
    display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px;
}
.fs-status-0 { background: #fff3e0; color: #e65100; }
.fs-status-1 { background: #e8f5e9; color: #2e7d32; }
.fs-status-2 { background: #f5f5f5; color: #9e9e9e; }

/* Modal */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 200;
}
.modal {
    position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: var(--card-bg); border-radius: var(--radius);
    padding: 24px; width: 90%; max-width: 600px; max-height: 80vh;
    overflow-y: auto; z-index: 201;
}
.hidden { display: none; }

/* Page header */
.page-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px;
}
.page-header h2 { font-size: 24px; }

/* Back link */
.back-link {
    display: inline-flex; align-items: center; gap: 4px;
    color: var(--primary); cursor: pointer; margin-bottom: 16px; font-size: 14px;
}
.back-link:hover { text-decoration: underline; }

/* Novel Detail Cover */
.novel-detail-cover {
    width: 160px; height: 210px; flex-shrink: 0;
    border-radius: 8px; overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex; align-items: center; justify-content: center;
    font-size: 64px; color: white;
}
.novel-detail-cover img { width: 100%; height: 100%; object-fit: cover; }

/* Search */
.search-bar {
    display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap;
}
.search-bar input {
    flex: 1; min-width: 200px; padding: 10px 14px;
    border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
}
.search-bar input:focus { outline: none; border-color: var(--primary); }

/* Empty state */
.empty-state {
    text-align: center; padding: 60px 20px; color: var(--text-secondary);
}
.empty-state .icon { font-size: 48px; margin-bottom: 16px; }

/* Responsive */
@media (max-width: 768px) {
    .novel-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .character-grid { grid-template-columns: 1fr; }
    #app { padding: 16px; }
}

/* Version History */
.version-list { display: flex; flex-direction: column; gap: 8px; }
.version-item {
    padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px;
    transition: background 0.2s;
}
.version-item:hover { background: #f5f7fa; }
.version-badge {
    display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px;
    background: #e3f2fd; color: #1565c0; font-weight: 600; margin-right: 8px;
}
.version-preview {
    max-height: 400px; overflow-y: auto; padding: 12px;
    background: var(--bg); border-radius: 8px;
}
.version-preview-content {
    padding: 10px; background: var(--card-bg); border: 1px solid var(--border);
    border-radius: 6px; white-space: pre-wrap; font-size: 14px; line-height: 1.8;
}