/* =============================================================
   xxs · 响应式设计系统
   纯中文 / 深色 + 金色 / 全设备自适应
   ============================================================= */

:root {
    /* 配色（沿用午夜书廊） */
    --xs-bg: #08090c;
    --xs-bg-2: #0b0d12;
    --xs-bg-3: #0e1117;
    --xs-panel: #10131a;
    --xs-panel-2: #151922;
    --xs-panel-3: #1b202b;
    --xs-line: rgba(255, 255, 255, .07);
    --xs-line-2: rgba(255, 255, 255, .13);
    --xs-text: #ece9e3;
    --xs-text-2: #b9b5ac;
    --xs-muted: #8b877f;
    --xs-dim: #605d57;
    --xs-gold: #e2b26d;
    --xs-gold-2: #f4d6a2;
    --xs-gold-soft: rgba(226, 178, 109, .12);
    --xs-terra: #d97a5f;
    --xs-sage: #7fb8a4;
    --xs-indigo: #7f93c9;
    --xs-pink: #d98aa8;
    --xs-shadow: 0 24px 60px rgba(0, 0, 0, .45);
    --xs-shadow-sm: 0 8px 24px rgba(0, 0, 0, .3);

    /* 圆角 / 间距 / 宽度 */
    --xs-r: 16px;
    --xs-r-sm: 10px;
    --xs-r-xs: 7px;
    --xs-wrap: 1400px;
    --xs-gap: 20px;
    --xs-header-h: 64px;

    /* 字体 */
    --xs-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
    --xs-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body.xs-body {
    margin: 0;
    min-height: 100vh;
    color: var(--xs-text);
    background:
        radial-gradient(1000px 560px at 12% -10%, rgba(226, 178, 109, .06), transparent 62%),
        radial-gradient(900px 520px at 96% 2%, rgba(127, 147, 201, .05), transparent 60%),
        var(--xs-bg);
    font: 15px/1.7 var(--xs-sans);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; transition: color .18s ease, border-color .18s ease, background .18s ease, opacity .18s ease; }
a:hover { color: var(--xs-gold); }
img { max-width: 100%; border: 0; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; background: none; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 600; line-height: 1.3; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
hr { border: 0; border-top: 1px solid var(--xs-line); margin: 0; }
::selection { background: var(--xs-gold-soft); color: var(--xs-gold-2); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--xs-bg); }
::-webkit-scrollbar-thumb { background: var(--xs-panel-3); border-radius: 10px; border: 2px solid var(--xs-bg); }

/* ---------- 布局容器 ---------- */
.xs-wrap {
    width: 100%;
    max-width: var(--xs-wrap);
    margin: 0 auto;
    padding: 0 24px;
}

.xs-main { padding: 28px 0 48px; }

/* ---------- 通用栅格（自动响应） ---------- */
.xs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--xs-gap);
}
.xs-grid--2 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.xs-grid--compact { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 14px; }

/* ---------- 区块标题 ---------- */
.xs-sec-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 18px;
}
.xs-sec-title {
    font-size: 21px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}
.xs-sec-title::before {
    content: "";
    width: 4px;
    height: 20px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--xs-gold-2), var(--xs-gold));
}
.xs-sec-head .xs-more { color: var(--xs-muted); font-size: 13px; white-space: nowrap; }
.xs-sec-head .xs-more:hover { color: var(--xs-gold); }

/* ---------- 按钮 ---------- */
.xs-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid transparent;
    transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
}
.xs-btn--gold {
    color: #1a140a;
    background: linear-gradient(135deg, var(--xs-gold-2), var(--xs-gold));
    box-shadow: 0 8px 22px rgba(226, 178, 109, .25);
}
.xs-btn--gold:hover { color: #1a140a; transform: translateY(-1px); }
.xs-btn--ghost {
    color: var(--xs-text-2);
    border-color: var(--xs-line-2);
    background: rgba(255, 255, 255, .03);
}
.xs-btn--ghost:hover { color: var(--xs-gold); border-color: var(--xs-gold); }
.xs-btn--block { width: 100%; }

/* ---------- 徽章 / 标签 ---------- */
.xs-chip {
    display: inline-flex;
    align-items: center;
    padding: 3px 11px;
    border-radius: 999px;
    font-size: 12px;
    color: var(--xs-gold-2);
    background: var(--xs-gold-soft);
    border: 1px solid rgba(226, 178, 109, .22);
}
.xs-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    color: var(--xs-text-2);
    background: var(--xs-panel);
    border: 1px solid var(--xs-line);
}
.xs-tag:hover { color: var(--xs-gold); border-color: var(--xs-gold); }
.xs-tag.is-active { color: #1a140a; background: linear-gradient(135deg, var(--xs-gold-2), var(--xs-gold)); border-color: transparent; }

/* ---------- 书籍卡片 ---------- */
.xs-book { display: flex; flex-direction: column; }
.xs-book-cover {
    position: relative;
    aspect-ratio: 3 / 4;
    border-radius: var(--xs-r-sm);
    overflow: hidden;
    background: var(--xs-panel);
    margin-bottom: 10px;
}
.xs-book-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.xs-book:hover .xs-book-cover img { transform: scale(1.05); }
.xs-book-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    background: rgba(0, 0, 0, .62);
    backdrop-filter: blur(4px);
}
.xs-book-state {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 14px 8px 7px;
    font-size: 11px;
    color: #fff;
    background: linear-gradient(transparent, rgba(0, 0, 0, .78));
}
.xs-book-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.xs-book-meta { font-size: 12px; color: var(--xs-muted); display: flex; align-items: center; gap: 6px; }
.xs-book-desc { margin-top: 6px; font-size: 12.5px; color: var(--xs-muted); line-height: 1.55; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- 面板 ---------- */
.xs-panel {
    background: linear-gradient(180deg, var(--xs-panel), var(--xs-bg-2));
    border: 1px solid var(--xs-line);
    border-radius: var(--xs-r);
    padding: 22px;
}

/* ---------- 表单 ---------- */
.xs-input, .xs-select, .xs-textarea {
    width: 100%;
    padding: 11px 14px;
    border-radius: var(--xs-r-sm);
    background: var(--xs-bg-3);
    border: 1px solid var(--xs-line-2);
    color: var(--xs-text);
    outline: none;
    transition: border-color .15s ease;
}
.xs-input:focus, .xs-select:focus, .xs-textarea:focus { border-color: var(--xs-gold); }
.xs-label { display: block; font-size: 13px; color: var(--xs-text-2); margin-bottom: 7px; }
.xs-field { margin-bottom: 18px; }

/* ---------- 分页 ---------- */
.xs-pagination { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 28px; }
.xs-pagination a, .xs-pagination span {
    min-width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 10px;
    border-radius: var(--xs-r-xs);
    font-size: 14px;
    color: var(--xs-text-2);
    background: var(--xs-panel);
    border: 1px solid var(--xs-line);
}
.xs-pagination a:hover { color: var(--xs-gold); border-color: var(--xs-gold); }
.xs-pagination .current { color: #1a140a; background: linear-gradient(135deg, var(--xs-gold-2), var(--xs-gold)); border-color: transparent; }
.xs-pagination .disabled { opacity: .45; pointer-events: none; }

/* ---------- 返回顶部 ---------- */
.xs-totop {
    position: fixed;
    right: 24px;
    bottom: 28px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    color: var(--xs-gold-2);
    background: var(--xs-panel-2);
    border: 1px solid var(--xs-line-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
    z-index: 900;
}
.xs-totop.show { opacity: 1; visibility: visible; transform: translateY(0); }
.xs-totop svg { width: 22px; height: 22px; margin: 0 auto; }

/* ---------- 面包屑 ---------- */
.xs-crumb { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--xs-muted); margin-bottom: 20px; }
.xs-crumb a:hover { color: var(--xs-gold); }
.xs-crumb .sep { color: var(--xs-dim); }

/* =============================================================
   响应式断点
   ============================================================= */
@media (max-width: 1024px) {
    .xs-wrap { padding: 0 18px; }
    .xs-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; }
    .xs-sec-title { font-size: 19px; }
}

@media (max-width: 768px) {
    body.xs-body { font-size: 14.5px; }
    .xs-main { padding: 20px 0 36px; }
    .xs-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 14px; }
    .xs-grid--compact { grid-template-columns: repeat(auto-fill, minmax(105px, 1fr)); }
    .xs-panel { padding: 16px; }
    .xs-btn { padding: 9px 18px; }
}

@media (max-width: 480px) {
    .xs-wrap { padding: 0 14px; }
    .xs-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .xs-grid--compact { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .xs-sec-head { margin-bottom: 14px; }
    .xs-sec-title { font-size: 17px; }
    .xs-book-title { font-size: 13px; }
    .xs-book-meta, .xs-book-desc { font-size: 11.5px; }
}