/* ============================================================
   Book_MS 设计系统
   配色：Slate 蓝灰基底 + Indigo 强调（亮/暗双主题）
   令牌：颜色 / 圆角 / 阴影 / 间距 / 字体
   ============================================================ */
:root {
    /* 颜色 */
    --bg: #f5f6f8;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e5e7eb;
    --border-strong: #d1d5db;
    --text: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --brand: #4f46e5;
    --brand-strong: #4338ca;
    --brand-soft: #eef2ff;
    --header-bg: #111827;
    --header-text: #f9fafb;
    --on-header-muted: rgba(255, 255, 255, 0.65);
    --ok: #059669;
    --warn: #d97706;
    --danger: #dc2626;
    --code-bg: #f1f5f9;

    /* 圆角 */
    --r-sm: 6px;
    --r-md: 10px;
    --r-lg: 14px;
    --r-full: 999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
    --shadow-md: 0 1px 3px rgba(16, 24, 40, 0.08), 0 4px 14px rgba(16, 24, 40, 0.06);
    --shadow-lg: 0 8px 28px rgba(16, 24, 40, 0.14);

    /* 间距刻度 */
    --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px;
    --sp-5: 20px; --sp-6: 24px; --sp-8: 32px; --sp-10: 40px;

    /* 字体与动效 */
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
            "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --dur: 0.18s;
}

[data-theme="dark"] {
    --bg: #0b1220;
    --surface: #131c2e;
    --surface-2: #0f172a;
    --border: #24314a;
    --border-strong: #33415e;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --brand: #818cf8;
    --brand-strong: #a5b4fc;
    --brand-soft: #1e2440;
    --header-bg: #0b1220;
    --header-text: #f1f5f9;
    --on-header-muted: rgba(226, 232, 240, 0.6);
    --ok: #34d399;
    --warn: #fbbf24;
    --danger: #f87171;
    --code-bg: #0f172a;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 8px 28px rgba(0, 0, 0, 0.55);
}

/* ============ 基础 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
    min-height: 100vh;
}
::selection { background: var(--brand); color: #fff; }
a { color: var(--brand); }
button { font-family: inherit; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 8px;
    border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background-color: var(--text-muted); }
::-webkit-scrollbar-track { background: transparent; }

/* ============ 顶栏 ============ */
.header {
    background: var(--header-bg);
    color: var(--header-text);
    position: sticky; top: 0; z-index: 40;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 4px 20px rgba(0, 0, 0, 0.12);
}
.header-inner {
    max-width: 1320px; margin: 0 auto; padding: 0 1.5rem;
    height: 60px; display: flex; align-items: center; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: 0.7rem; min-width: 0; }
.brand-logo {
    width: 34px; height: 34px; flex-shrink: 0;
    display: grid; place-items: center;
    background: linear-gradient(135deg, var(--brand) 0%, #7c3aed 100%);
    border-radius: 9px; color: #fff; font-size: 1.05rem;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.45);
}
.brand-text h1 { font-size: 1.02rem; font-weight: 650; letter-spacing: 0.01em; }
.brand-text p { font-size: 0.74rem; color: var(--on-header-muted); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 0.5rem; }

.theme-toggle, .user-menu-trigger {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: var(--header-text);
    padding: 0.4rem 0.75rem; border-radius: 8px; cursor: pointer;
    font-size: 0.85rem; transition: all var(--dur) var(--ease);
}
.theme-toggle:hover, .user-menu-trigger:hover { background: rgba(255, 255, 255, 0.16); }
.theme-toggle { font-size: 1rem; padding: 0.35rem 0.65rem; }

/* 用户菜单 */
.user-menu { position: relative; }
.user-menu-trigger { display: flex; align-items: center; gap: 0.4rem; }
.user-menu-dropdown {
    display: none; position: absolute; right: 0; top: calc(100% + 8px);
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-md); box-shadow: var(--shadow-lg);
    min-width: 170px; z-index: 60; overflow: hidden; padding: 4px;
}
.user-menu:hover .user-menu-dropdown, .user-menu:focus-within .user-menu-dropdown { display: block; }
.user-menu-dropdown a, .user-menu-dropdown .menu-item {
    display: block; padding: 0.5rem 0.7rem; border-radius: 6px;
    font-size: 0.86rem; color: var(--text); text-decoration: none; cursor: pointer;
}
.user-menu-dropdown a:hover, .user-menu-dropdown .menu-item:hover { background: var(--surface-2); }
.user-menu-dropdown .menu-info { color: var(--text-secondary); font-size: 0.78rem; }
.user-menu-dropdown .divider { border-top: 1px solid var(--border); margin: 4px 0; }

/* ============ 容器 ============ */
.container { max-width: 1320px; margin: 0 auto; padding: 0 1.5rem 4rem; }

/* ============ 统计栏 ============ */
.stats-bar {
    display: flex; gap: 2.2rem; flex-wrap: wrap;
    padding: 1.05rem 1.4rem; margin-top: 1.4rem;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-lg); box-shadow: var(--shadow-sm);
}
.stat { display: flex; align-items: center; gap: 0.45rem; font-size: 0.88rem; color: var(--text-secondary); }
.stat .stat-icon { opacity: 0.75; font-size: 1rem; }
.stat strong { color: var(--text); font-size: 1.08rem; font-weight: 650; margin: 0 0.1rem; }

/* ============ 工具栏 ============ */
.toolbar { display: flex; gap: 0.75rem; flex-wrap: wrap; align-items: center; margin-top: 1rem; }
.search-wrapper { position: relative; flex: 1; min-width: 220px; max-width: 420px; }
.search-box {
    width: 100%; padding: 0.55rem 0.9rem 0.55rem 2.4rem;
    border: 1px solid var(--border); border-radius: var(--r-md);
    font-size: 0.9rem; font-family: inherit; background: var(--surface); color: var(--text);
    transition: all var(--dur) var(--ease);
}
.search-box::placeholder { color: var(--text-muted); }
.search-wrapper::before {
    content: "🔍"; position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%);
    font-size: 0.85rem; opacity: 0.5; pointer-events: none;
}
.search-box:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }

.search-results {
    display: none; position: absolute; top: calc(100% + 6px); left: 0; right: 0;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-md); box-shadow: var(--shadow-lg);
    z-index: 50; max-height: 420px; overflow-y: auto; padding: 5px;
}
.search-hit {
    display: block; padding: 0.55rem 0.7rem; border-radius: 8px;
    text-decoration: none; color: var(--text); font-size: 0.86rem; line-height: 1.45;
    transition: background var(--dur) var(--ease);
}
.search-hit:hover { background: var(--surface-2); }
.search-hit + .search-hit { margin-top: 2px; }
.search-hit-book { display: block; font-size: 0.72rem; color: var(--brand); font-weight: 550; margin-bottom: 0.1rem; }
.search-hit-title { font-weight: 600; }
.search-hit-snippet { display: -webkit-box; font-size: 0.78rem; color: var(--text-secondary); margin-top: 0.12rem;
    -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden; }
.search-hit-snippet mark { background: var(--brand-soft); color: inherit; border-radius: 2px; padding: 0 2px; }
.search-empty { padding: 0.9rem; text-align: center; color: var(--text-muted); font-size: 0.85rem; }

/* 标签 chips */
.tag-chips { display: flex; gap: 0.45rem; flex-wrap: wrap; align-items: center; }
.tag-chip {
    padding: 0.32rem 0.85rem; border-radius: var(--r-full);
    font-size: 0.8rem; cursor: pointer;
    border: 1px solid var(--border); background: var(--surface);
    color: var(--text-secondary); transition: all var(--dur) var(--ease);
    user-select: none; white-space: nowrap;
}
.tag-chip:hover { border-color: var(--brand); color: var(--brand); }
.tag-chip.active {
    background: var(--brand); border-color: var(--brand); color: #fff;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.35);
}
.tag-chip .count { opacity: 0.6; margin-left: 0.2rem; font-size: 0.74rem; }

/* 工具栏右侧 */
.toolbar-right { display: flex; gap: 0.5rem; align-items: center; margin-left: auto; }
.btn-icon {
    padding: 0.45rem 0.8rem; border: 1px solid var(--border); border-radius: var(--r-md);
    background: var(--surface); cursor: pointer; font-size: 0.88rem; color: var(--text-secondary);
    transition: all var(--dur) var(--ease);
}
.btn-icon:hover { border-color: var(--border-strong); color: var(--text); }
.sort-select {
    padding: 0.45rem 0.7rem; border: 1px solid var(--border); border-radius: var(--r-md);
    font-size: 0.88rem; background: var(--surface); color: var(--text-secondary);
    cursor: pointer; font-family: inherit; transition: all var(--dur) var(--ease);
}
.sort-select:hover, .sort-select:focus { border-color: var(--border-strong); color: var(--text); outline: none; }

/* ============ 图书卡片 ============ */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: 1.25rem; margin-top: 1.3rem;
}
.book-grid.list-view { grid-template-columns: 1fr; max-width: 860px; margin-left: auto; margin-right: auto; }
.book-card {
    display: block; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-lg); padding: 1.15rem 1.3rem 1rem;
    text-decoration: none; color: var(--text);
    box-shadow: var(--shadow-sm);
    transition: all 0.22s var(--ease);
    position: relative; overflow: hidden;
}
.book-card::before {
    content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--brand), #7c3aed);
    opacity: 0; transition: opacity var(--dur) var(--ease);
}
.book-card:hover {
    transform: translateY(-3px);
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    outline: 1px solid var(--border);
}
.book-card:hover::before { opacity: 1; }
.book-title { font-size: 1.02rem; font-weight: 650; margin-bottom: 0.35rem;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.book-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.book-meta { display: flex; gap: 0.4rem; align-items: center; margin-top: 0.75rem; flex-wrap: wrap;
    padding-top: 0.7rem; border-top: 1px dashed var(--border); }
.badge {
    background: var(--brand-soft); color: var(--brand);
    padding: 0.14rem 0.55rem; border-radius: var(--r-full);
    font-size: 0.74rem; font-weight: 550;
}
.badge-muted { background: var(--surface-2); color: var(--text-muted); font-weight: 450; }
.meta-time { font-size: 0.76rem; color: var(--text-muted); margin-left: auto; }
.empty-tip {
    grid-column: 1 / -1; text-align: center; color: var(--text-muted);
    padding: 4.5rem 0 3rem; font-size: 0.95rem;
}
.empty-tip .empty-icon { font-size: 2.6rem; display: block; margin-bottom: 0.8rem; opacity: 0.6; }

/* ============ 按钮 ============ */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
    padding: 0.55rem 1.3rem; background: var(--brand); color: #fff;
    border: none; border-radius: var(--r-md); font-size: 0.9rem; font-weight: 550;
    text-decoration: none; cursor: pointer;
    transition: all var(--dur) var(--ease);
    box-shadow: 0 1px 2px rgba(79, 70, 229, 0.35);
}
.btn:hover { background: var(--brand-strong); box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4); }
.btn:active { transform: scale(0.98); }
.btn-sm { padding: 0.34rem 0.85rem; font-size: 0.82rem; border-radius: var(--r-sm); }
.btn-ghost {
    background: transparent; color: var(--text-secondary);
    border: 1px solid var(--border); box-shadow: none;
}
.btn-ghost:hover { background: var(--surface-2); color: var(--text); box-shadow: none; }
.btn-danger { background: var(--danger); box-shadow: 0 1px 2px rgba(220, 38, 38, 0.3); }
.btn-danger:hover { background: #b91c1c; }
.btn-danger-hover { background: transparent; border: 1px solid var(--border); color: var(--text-secondary); box-shadow: none; }
.btn-danger-hover:hover { background: #fef2f2; color: var(--danger); border-color: #fecaca; box-shadow: none; }
[data-theme="dark"] .btn-danger-hover:hover { background: #2a1418; border-color: #5c2a2a; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ============ 表单 ============ */
.form-input {
    width: 100%; padding: 0.5rem 0.8rem; border: 1px solid var(--border);
    border-radius: var(--r-sm); font-size: 0.9rem; font-family: inherit;
    background: var(--surface); color: var(--text); transition: all var(--dur) var(--ease);
}
.form-input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }

/* ============ 登录页 ============ */
.auth-wrap { min-height: calc(100vh - 60px); display: grid; place-items: center; padding: 2rem 1rem; }
.auth-box {
    width: 100%; max-width: 380px; background: var(--surface);
    border: 1px solid var(--border); border-radius: var(--r-lg);
    padding: 2.2rem 2rem; box-shadow: var(--shadow-md);
}
.auth-brand { text-align: center; margin-bottom: 1.6rem; }
.auth-brand .brand-logo { width: 46px; height: 46px; font-size: 1.3rem; border-radius: 12px; margin: 0 auto 0.7rem; }
.auth-brand h2 { font-size: 1.15rem; font-weight: 650; }
.auth-brand p { font-size: 0.82rem; color: var(--text-secondary); margin-top: 0.2rem; }
.auth-form label { display: block; font-size: 0.84rem; color: var(--text-secondary); margin-bottom: 0.95rem; }
.auth-form .form-input { margin-top: 0.32rem; padding: 0.6rem 0.85rem; }
.btn-block { width: 100%; margin-top: 0.3rem; padding: 0.62rem; }
.form-error {
    background: #fef2f2; color: var(--danger); border: 1px solid #fecaca;
    padding: 0.55rem 0.8rem; border-radius: var(--r-sm);
    font-size: 0.84rem; margin-bottom: 0.9rem;
}
[data-theme="dark"] .form-error { background: #2a1418; border-color: #5c2a2a; }
.auth-tip { text-align: center; color: var(--text-muted); font-size: 0.78rem; margin-top: 1.2rem; }

/* ============ 错误页 ============ */
.error-box { text-align: center; padding: 6rem 1rem 3rem; }
.error-box .error-code {
    font-size: 4.5rem; font-weight: 800; line-height: 1;
    background: linear-gradient(135deg, var(--brand), #7c3aed);
    -webkit-background-clip: text; background-clip: text; color: transparent;
}
.error-box p { color: var(--text-secondary); margin: 1rem 0 1.8rem; }

/* ============ 管理页 ============ */
.admin-bar { display: flex; align-items: center; gap: 1rem; margin-top: 1.4rem; flex-wrap: wrap; }
.admin-bar h2 { font-size: 1.15rem; font-weight: 650; }
.admin-actions { display: flex; gap: 0.6rem; align-items: center; margin-left: auto; }
.admin-scan-result { font-size: 0.85rem; color: var(--text-secondary); }
.admin-table-wrap {
    margin-top: 1.1rem; overflow-x: auto;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-lg); box-shadow: var(--shadow-sm);
}
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; min-width: 920px; }
.admin-table th, .admin-table td {
    padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--border);
    text-align: left; vertical-align: middle;
}
.admin-table th {
    background: var(--surface-2); font-weight: 600; color: var(--text-secondary);
    font-size: 0.8rem; letter-spacing: 0.02em;
}
.admin-table tbody tr { transition: background var(--dur) var(--ease); }
.admin-table tbody tr:hover { background: var(--surface-2); }
.admin-table tbody tr:last-child td { border-bottom: none; }
.admin-table .form-input { margin-top: 0; padding: 0.4rem 0.6rem; font-size: 0.85rem; min-width: 130px; }
.cell-slug { font-family: var(--mono); font-size: 0.8rem; color: var(--text-secondary); }
.cell-meta { font-size: 0.72rem; color: var(--text-muted); }

/* 页脚 */
.footer { text-align: center; color: var(--text-muted); font-size: 0.78rem; padding: 2rem 0 1rem; }