/* Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #fafaf8;
    --text: #2c2c2c;
    --muted: #777;
    --border: #ddd;
    --accent: #4a6fa5;
    --accent-hover: #3a5a8a;
    --tag-confusing: rgba(255, 165, 0, 0.3);
    --tag-slow: rgba(128, 128, 128, 0.3);
    --tag-loved: rgba(255, 105, 180, 0.3);
    --tag-unbelievable: rgba(255, 80, 80, 0.25);
    --tag-great_line: rgba(255, 215, 0, 0.35);
    --tag-comment: rgba(100, 149, 237, 0.25);
}

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

a { color: var(--accent); }

/* Auth pages */
.auth-container {
    max-width: 360px;
    margin: 80px auto;
    padding: 0 20px;
    text-align: center;
}

.auth-container h1 {
    font-size: 1.8rem;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--muted);
    margin-bottom: 32px;
}

.auth-form {
    text-align: left;
}

.auth-form h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.auth-form input {
    display: block;
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
}

.auth-form button {
    width: 100%;
    padding: 10px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
}

.auth-form button:hover { background: var(--accent-hover); }

.switch-link {
    text-align: center;
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--muted);
}

.error {
    margin-top: 16px;
    padding: 10px;
    background: #fee;
    color: #c33;
    border-radius: 6px;
    font-size: 0.9rem;
}

/* Nav bar */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    background: #fff;
}

.nav h1 { font-size: 1.1rem; }

.nav-links { display: flex; gap: 16px; align-items: center; }
.nav-links a { text-decoration: none; font-size: 0.9rem; }

.btn {
    display: inline-block;
    padding: 8px 16px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
}

.btn:hover { background: var(--accent-hover); }
.btn-sm { padding: 5px 12px; font-size: 0.85rem; }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; }

/* Chapter list */
.page-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 32px 20px;
}

.chapter-list { list-style: none; }

.chapter-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.chapter-item a {
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 500;
}

.chapter-meta {
    font-size: 0.85rem;
    color: var(--muted);
}

.progress-bar {
    width: 80px;
    height: 6px;
    background: #eee;
    border-radius: 3px;
    overflow: hidden;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.3s;
}

/* Upload page */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    margin: 24px 0;
}

.upload-area input[type="file"] { margin: 16px 0; }
.upload-area input[type="text"] {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    width: 300px;
    max-width: 100%;
    margin-bottom: 16px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

/* Admin dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.stat-card .number {
    font-size: 2rem;
    font-weight: 700;
}

.stat-card .label {
    font-size: 0.85rem;
    color: var(--muted);
}

.readers-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
}

.readers-table th, .readers-table td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

.readers-table th {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 600;
}

.chapter-feedback {
    margin: 24px 0;
}

.tag-counts {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 12px 0;
}

.tag-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.tag-badge.confusing { background: var(--tag-confusing); }
.tag-badge.slow { background: var(--tag-slow); }
.tag-badge.loved { background: var(--tag-loved); }
.tag-badge.unbelievable { background: var(--tag-unbelievable); }
.tag-badge.great_line { background: var(--tag-great_line); }
.tag-badge.comment { background: var(--tag-comment); }

/* Tabs */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    font-size: 0.95rem;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    color: var(--muted);
}

.tab.active {
    color: var(--text);
    border-bottom-color: var(--accent);
    font-weight: 600;
}