/* Shelf Web Companion — Responsive styles */
:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --surface-variant: #f0f0f5;
    --on-surface: #1a1a2e;
    --on-surface-variant: #555566;
    --primary: #6750a4;
    --on-primary: #ffffff;
    --highlight: #fff59d;
    --border: #e0e0e8;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --radius: 12px;
    --sidebar-width: 260px;
    --font-body: Georgia, 'Times New Roman', serif;
    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --surface: #252538;
    --surface-variant: #2a2a40;
    --on-surface: #e8e8f0;
    --on-surface-variant: #a0a0b8;
    --primary: #b69dff;
    --on-primary: #1a1a2e;
    --highlight: #7d6b1f;
    --border: #3a3a50;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

[data-theme="sepia"] {
    --bg: #f4ecd8;
    --surface: #faf5e8;
    --surface-variant: #ede4cc;
    --on-surface: #3a2e1e;
    --on-surface-variant: #6b5d44;
    --primary: #8b6914;
    --border: #d4c9a8;
}

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

body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--on-surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    color: var(--on-surface);
}

.icon-btn:hover { background: var(--surface-variant); }

.sidebar-nav {
    flex: 1;
    padding: 0 12px;
}

.nav-item {
    display: block;
    padding: 12px 16px;
    color: var(--on-surface);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: background 0.15s;
}

.nav-item:hover, .nav-item.active {
    background: var(--surface-variant);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.user-email {
    flex: 1;
    font-size: 0.85rem;
    color: var(--on-surface-variant);
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Content */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px;
    max-width: 100%;
    overflow-x: hidden;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--on-surface-variant);
}

/* Library */
.library-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.library-header h2 {
    font-size: 1.5rem;
}

.link-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    display: flex;
    gap: 16px;
    transition: transform 0.1s;
}

.link-card:hover { transform: translateY(-1px); }

.link-card .thumbnail {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--surface-variant);
    flex-shrink: 0;
}

.link-card .info {
    flex: 1;
    min-width: 0;
}

.link-card .title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.link-card .domain {
    font-size: 0.85rem;
    color: var(--on-surface-variant);
}

.link-card .meta {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    font-size: 0.8rem;
}

.badge {
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--surface-variant);
    color: var(--on-surface-variant);
}

.badge.reading { background: var(--primary); color: var(--on-primary); }
.badge.read { background: #4caf50; color: white; }

/* Reader */
.reader-container {
    max-width: 720px;
    margin: 0 auto;
}

.reader-header {
    margin-bottom: 24px;
}

.reader-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.reader-domain {
    font-size: 0.9rem;
    color: var(--on-surface-variant);
}

.reader-controls {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.reader-controls button {
    padding: 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--on-surface);
    cursor: pointer;
    font-size: 0.85rem;
}

.reader-controls button:hover { background: var(--surface-variant); }

.reader-content {
    font-family: var(--font-body);
    font-size: 1.1rem;
    line-height: 1.8;
}

.reader-content p { margin-bottom: 1.2em; }

.reader-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 16px 0;
}

.reader-content h1, .reader-content h2, .reader-content h3 {
    font-family: var(--font-ui);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.reader-content blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--on-surface-variant);
    font-style: italic;
}

.highlight {
    background: var(--highlight);
    border-radius: 2px;
    padding: 0 2px;
    cursor: pointer;
}

.progress-bar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: 3px;
    background: var(--primary);
    transform-origin: left;
    transform: scaleX(0);
    z-index: 200;
    transition: transform 0.1s;
}

/* Login */
.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
}

.login-container h2 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.login-container p {
    color: var(--on-surface-variant);
    margin-bottom: 24px;
}

.gsi-button {
    padding: 12px 24px;
    border-radius: var(--radius);
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
}

.gsi-button:hover { opacity: 0.9; }

/* Offline banner */
.offline-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ff9800;
    color: white;
    text-align: center;
    padding: 8px;
    font-size: 0.85rem;
    z-index: 300;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.2s;
    }
    .sidebar.open { transform: translateX(0); }
    .content { margin-left: 0; padding: 16px; }
    .progress-bar { left: 0; }
    .menu-toggle { display: block; }
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

.hidden { display: none !important; }