* { box-sizing: border-box; }
:root {
    --primary: #0d47a1;
    --primary-hover: #1565c0;
    --primary-soft: #e3f2fd;
    --text: #2c3e50;
    --muted: #6b7280;
    --border: #d9e0e7;
    --danger: #c62828;
    --success: #087f5b;
}
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f7f6;
    margin: 0;
    color: #333;
}
a { color: var(--primary); }
nav {
    background: #fff;
    padding: 10px 40px;
    box-shadow: 0 2px 10px rgba(0,0,0,.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    position: relative;
    z-index: 20;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
}
.nav-logo img { height: 50px; width: auto; }
.nav-logo h1 { font-size: 20px; margin: 0; color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.nav-links > a, .nav-logout button {
    text-decoration: none;
    color: #555;
    font-weight: 700;
    padding: 8px 15px;
    border-radius: 4px;
    border: 0;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    font-family: inherit;
}
.nav-links > a:hover, .nav-links > a.active, .nav-logout button:hover {
    background: var(--primary);
    color: #fff;
}
.nav-logout { margin: 0; }
.hero { text-align: center; padding: 40px 20px 20px; }
.hero h2 { margin: 0; font-size: 32px; color: #111; }
.hero p { margin: 5px 0 0; color: #666; font-size: 16px; font-style: italic; }
.container, .panel {
    max-width: 680px;
    background: #fff;
    padding: 30px;
    margin: 20px auto;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,.06);
}
.container.narrow { max-width: 520px; }
.container.wide, .panel.wide { max-width: 1180px; }
.center { text-align: center; }
.form-group { text-align: left; margin-bottom: 20px; }
label { display: block; font-weight: 700; margin-bottom: 6px; font-size: 14px; }
input[type="text"], input[type="email"], input[type="password"], input[type="file"],
input[type="search"], select, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #c8d0d8;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
}
input:focus, select:focus, textarea:focus {
    outline: 2px solid rgba(13,71,161,.18);
    border-color: var(--primary);
}
input[type="file"] { border: 2px dashed #bbb; background: #fafafa; cursor: pointer; }
.help, .alias-prefix { color: #666; font-size: 12px; margin-top: 5px; display: block; line-height: 1.5; }
.btn, button.primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 18px;
    font-size: 14px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 700;
    text-decoration: none;
    transition: .2s;
}
.btn:hover, button.primary:hover { background: var(--primary-hover); }
.btn.full { width: 100%; }
.btn.secondary { background: #607d8b; }
.btn.secondary:hover { background: #455a64; }
.btn.success { background: #087f5b; }
.btn.danger { background: var(--danger); }
.btn.light { background: #edf2f7; color: #263238; }
.btn.small { padding: 7px 10px; font-size: 12px; }
.alert { padding: 12px; border-radius: 6px; margin-bottom: 20px; font-size: 14px; font-weight: 700; }
.alert.error { background: #fde8e8; color: #a61b1b; border: 1px solid #f8b4b4; }
.alert.success { background: #def7ec; color: #03543f; border: 1px solid #bcf0da; }
.alert.info { background: #e3f2fd; color: #0d47a1; border: 1px solid #90caf9; }
.result-box { margin-top: 25px; padding: 20px; background: var(--primary-soft); border: 1px solid #90caf9; border-radius: 8px; text-align: left; }
.link-input { width:100%; padding:10px; background:#fff; font-weight:700; color:var(--primary); text-align:center; font-size:15px; border:1px solid #90caf9; border-radius:4px; }
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0,1fr));
    gap: 9px 14px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 7px;
    background: #fbfcfd;
}
.checkbox-item, .radio-item { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; }
.checkbox-item input, .radio-item input { margin-top: 2px; }
.radio-row { display: flex; gap: 18px; flex-wrap: wrap; padding-top: 4px; }
.auth-divider { display:flex; align-items:center; gap:12px; color:#888; font-size:12px; margin:18px 0; }
.auth-divider::before, .auth-divider::after { content:''; height:1px; background:#ddd; flex:1; }
.google-btn {
    display:flex; align-items:center; justify-content:center; gap:10px;
    width:100%; border:1px solid #cfd8dc; background:#fff; color:#263238;
    padding:11px; border-radius:6px; text-decoration:none; font-weight:700;
}
.google-btn:hover { background:#f6f8fa; }
.google-icon { font-size:20px; font-weight:800; color:#4285f4; }
.auth-links { display:flex; justify-content:space-between; gap:12px; margin-top:16px; font-size:13px; flex-wrap:wrap; }
.page-header { padding: 28px 20px; background: var(--primary); color:#fff; text-align:center; }
.page-header h2 { margin:0; font-size:28px; }
.page-header p { margin:6px 0 0; opacity:.85; }
.stats-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px; margin-bottom:24px; }
.stat-card { background:#fff; padding:20px; border-radius:9px; box-shadow:0 3px 14px rgba(0,0,0,.06); border-top:4px solid var(--primary); }
.stat-card strong { display:block; font-size:28px; color:var(--primary); }
.stat-card span { color:#687078; font-size:13px; }
.table-wrap { overflow-x:auto; }
table.data-table { width:100%; border-collapse:collapse; font-size:13px; }
table.data-table th, table.data-table td { padding:11px 10px; border-bottom:1px solid #e8edf1; text-align:left; vertical-align:top; }
table.data-table th { background:#f7f9fb; color:#37474f; }
.badge { display:inline-block; padding:4px 8px; border-radius:999px; font-size:11px; font-weight:800; }
.badge.public { background:#dcfce7; color:#166534; }
.badge.private { background:#fff3cd; color:#7a5400; }
.badge.category { background:#e3f2fd; color:#0d47a1; margin:2px 3px 2px 0; }
.actions { display:flex; gap:6px; flex-wrap:wrap; }
.inline-form { display:inline; margin:0; }
.bookshelf-container { max-width:1100px; margin:36px auto; padding:0 20px; }
.bookshelf {
    display:grid; grid-template-columns:repeat(auto-fill,minmax(190px,1fr));
    gap:34px 24px; background:#fff; padding:36px 28px; border-radius:8px;
    box-shadow:0 4px 15px rgba(0,0,0,.05); border-bottom:15px solid #8d6e63;
}
.book-card { display:flex; flex-direction:column; align-items:center; text-align:center; position:relative; }
.book-main-link { text-decoration:none; color:inherit; display:flex; flex-direction:column; align-items:center; width:100%; transition:transform .2s; }
.book-main-link:hover { transform:translateY(-7px); }
.thumbnail-container {
    width:130px; height:180px; background:#eaeaea; box-shadow:0 8px 15px rgba(0,0,0,.15);
    border-radius:2px 6px 6px 2px; overflow:hidden; display:flex; align-items:center;
    justify-content:center; border-left:4px solid rgba(0,0,0,.15); position:relative;
}
.thumbnail-container canvas { width:100%; height:100%; object-fit:cover; }
.thumb-loading { position:absolute; font-size:11px; color:#777; font-style:italic; }
.book-title { font-size:14px; font-weight:700; margin-top:14px; color:#2c3e50; min-height:38px; line-height:19px; }
.book-meta { font-size:11px; color:#777; margin-top:4px; }
.book-share { margin-top:9px; display:flex; gap:5px; flex-wrap:wrap; justify-content:center; }
.filter-bar { max-width:1100px; margin:24px auto -15px; padding:0 20px; display:grid; grid-template-columns:2fr 1fr; gap:12px; }
.empty-library { text-align:center; padding:50px; color:#777; }
.profile-grid { display:grid; grid-template-columns:260px 1fr; gap:24px; }
.profile-card { text-align:center; }
.avatar {
    width:100px; height:100px; border-radius:50%; object-fit:cover;
    background:#e8eef4; display:inline-flex; align-items:center; justify-content:center;
    font-size:34px; color:var(--primary); font-weight:800; overflow:hidden;
}
.footer-note { text-align:center; color:#78828a; font-size:12px; padding:25px; }
@media (max-width: 850px) {
    nav { padding:10px 16px; align-items:flex-start; }
    .nav-logo h1 { font-size:16px; }
    .nav-links { justify-content:flex-end; }
    .stats-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
    .profile-grid { grid-template-columns:1fr; }
}
@media (max-width: 620px) {
    nav { flex-direction:column; align-items:stretch; }
    .nav-logo { justify-content:center; }
    .nav-links { justify-content:center; }
    .hero { padding-top:28px; }
    .hero h2 { font-size:26px; }
    .container, .panel { margin:15px 12px; padding:22px 18px; }
    .checkbox-grid { grid-template-columns:1fr; }
    .stats-grid { grid-template-columns:1fr 1fr; padding:0 12px; }
    .filter-bar { grid-template-columns:1fr; }
    .bookshelf { padding:28px 14px; grid-template-columns:repeat(2,minmax(0,1fr)); gap:28px 12px; }
    .thumbnail-container { width:110px; height:155px; }
}