:root {
  --ink: #2c2416;
  --ink-soft: #5a4a32;
  --paper: #f3ead7;
  --paper-deep: #e8d9b8;
  --border: #c4a574;
  --accent: #8b3a2a;
  --accent-dark: #6e2c1f;
  --gold: #b08d3e;
  --muted: #7a6a52;
  --card-bg: rgba(255, 250, 240, 0.92);
  --shadow: 0 8px 28px rgba(44, 36, 22, 0.12);
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(176, 141, 62, 0.12), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(139, 58, 42, 0.08), transparent 45%),
    linear-gradient(180deg, #f7efdc 0%, #efe2c4 40%, #e8d7b0 100%);
  min-height: 100vh;
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); }
img { max-width: 100%; height: auto; display: block; }

.container { width: min(1120px, 92vw); margin: 0 auto; }

/* 顶栏 */
.site-header {
  border-bottom: 2px solid var(--border);
  background: linear-gradient(180deg, rgba(255,251,242,.96), rgba(243,234,215,.9));
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(6px);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.18em;
  line-height: 1.2;
}
.brand span {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.35em;
  color: var(--muted);
  font-weight: 400;
  margin-top: 2px;
}
.nav {
  display: flex;
  gap: 8px 18px;
  flex-wrap: wrap;
  align-items: center;
}
.nav a {
  color: var(--ink-soft);
  font-size: 0.95rem;
  position: relative;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform .2s;
}
.nav a:hover::after { transform: scaleX(1); }

.search-form {
  display: flex;
  border: 1px solid var(--border);
  background: #fffaf0;
  min-width: min(280px, 100%);
}
.search-form input {
  border: 0;
  background: transparent;
  padding: 8px 12px;
  flex: 1;
  font-family: inherit;
  color: var(--ink);
  outline: none;
  min-width: 0;
}
.search-form button {
  border: 0;
  background: var(--accent);
  color: #fffaf0;
  padding: 8px 14px;
  cursor: pointer;
  font-family: inherit;
}
.user-links { display: flex; gap: 12px; font-size: 0.9rem; }

/* Hero */
.hero {
  padding: 48px 0 28px;
  text-align: center;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 12% 8% auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.hero-seal {
  display: inline-block;
  border: 2px solid var(--accent);
  color: var(--accent);
  padding: 4px 10px;
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  margin-bottom: 16px;
  animation: fade-up .7s ease both;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 0.28em;
  margin: 0 0 12px;
  font-weight: 700;
  animation: fade-up .8s .05s ease both;
}
.hero p {
  color: var(--muted);
  max-width: 36em;
  margin: 0 auto 20px;
  animation: fade-up .8s .12s ease both;
}
.announce {
  display: inline-block;
  border: 1px dashed var(--border);
  padding: 8px 18px;
  color: var(--ink-soft);
  background: rgba(255,250,240,.6);
  animation: fade-up .8s .18s ease both;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

.section { padding: 28px 0 40px; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
  margin-bottom: 22px;
}
.section-head h2 {
  margin: 0;
  font-size: 1.45rem;
  letter-spacing: 0.2em;
  font-weight: 700;
}
.section-head .more { color: var(--muted); font-size: 0.9rem; }

.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cat-item {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 22px 18px;
  text-align: center;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  box-shadow: var(--shadow);
}
.cat-item:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 14px 32px rgba(139, 58, 42, 0.15);
}
.cat-item h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  letter-spacing: 0.15em;
  color: var(--ink);
}
.cat-item p { margin: 0; color: var(--muted); font-size: 0.88rem; }

.book-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.book-card {
  border: 1px solid var(--border);
  background: var(--card-bg);
  overflow: hidden;
  transition: transform .25s, box-shadow .25s;
  box-shadow: var(--shadow);
}
.book-card:hover { transform: translateY(-3px); }
.book-cover {
  aspect-ratio: 3/4;
  background:
    linear-gradient(145deg, #d9c49a, #c4a574 40%, #8b3a2a 100%);
  display: grid;
  place-items: center;
  color: #fff8e8;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  padding: 16px;
  text-align: center;
  position: relative;
}
.book-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.book-body { padding: 12px 14px 16px; }
.book-body h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.45;
  letter-spacing: 0.04em;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--ink);
}
.book-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.85rem;
}
.price { color: var(--accent); font-weight: 700; }

/* 文章详情 */
.breadcrumb {
  padding: 18px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.breadcrumb a { color: var(--ink-soft); }
.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  padding: 20px 0 48px;
}
.side-panel {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 16px;
  height: fit-content;
  position: sticky;
  top: 88px;
}
.side-panel h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}
.side-panel ul { list-style: none; margin: 0; padding: 0; }
.side-panel li { margin: 6px 0; }
.article-main {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 28px clamp(16px, 4vw, 36px);
  box-shadow: var(--shadow);
}
.article-main h1 {
  margin: 0 0 12px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: 0.12em;
  text-align: center;
}
.article-meta {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--border);
}
.article-content {
  font-size: 1.02rem;
  line-height: 1.9;
}
.article-content h2, .article-content h3 {
  letter-spacing: 0.08em;
  margin-top: 1.4em;
}
.article-content img { margin: 12px auto; }
.download-box {
  margin-top: 28px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #fff8ea, #f3e6c8);
  padding: 20px;
  text-align: center;
}
.download-box .locked { color: var(--muted); margin-bottom: 14px; }
.pay-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fffaf0 !important;
  padding: 10px 22px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}
.btn.ghost {
  background: transparent;
  color: var(--accent) !important;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn.ghost:hover { color: #fffaf0 !important; }

/* 表单 */
.auth-wrap {
  max-width: 420px;
  margin: 40px auto 60px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 28px 24px;
  box-shadow: var(--shadow);
}
.auth-wrap h1 {
  text-align: center;
  letter-spacing: 0.2em;
  margin: 0 0 20px;
  font-size: 1.5rem;
}
.field { margin-bottom: 14px; }
.field label { display: block; margin-bottom: 6px; color: var(--ink-soft); font-size: 0.92rem; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  background: #fffaf0;
  padding: 10px 12px;
  font-family: inherit;
  color: var(--ink);
  outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent);
}
.flash {
  padding: 10px 14px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  background: #fff5e0;
  color: var(--accent-dark);
}
.flash.success { border-color: #6a8f5a; color: #3d5c34; background: #f0f6ea; }

/* 用户中心 */
.user-layout { padding: 24px 0 48px; }
.user-layout h1 { letter-spacing: 0.15em; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); background: var(--card-bg); }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
table.data th, table.data td {
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}
table.data th { background: rgba(196, 165, 116, 0.25); letter-spacing: 0.08em; }

.pagination {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 24px;
}
.pagination a {
  border: 1px solid var(--border);
  padding: 4px 10px;
  color: var(--ink-soft);
  background: var(--card-bg);
}
.pagination a.active {
  background: var(--accent);
  color: #fffaf0;
  border-color: var(--accent);
}

/* 支付弹窗 */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(30, 22, 12, 0.55);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 16px;
}
.pay-modal {
  width: min(400px, 94vw);
  background: #fffaf0;
  border: 1px solid var(--border);
  padding: 22px;
  text-align: center;
  box-shadow: var(--shadow);
  animation: fade-up .3s ease both;
}
.pay-modal h3 { margin: 0 0 8px; letter-spacing: 0.15em; }
.pay-modal .sub { color: var(--muted); margin: 0 0 16px; font-size: 0.92rem; }
.qr-wrap {
  width: 220px;
  height: 220px;
  margin: 0 auto 12px;
  border: 1px solid var(--border);
  background: #fff;
  display: grid;
  place-items: center;
}
.qr-wrap img { width: 200px; height: 200px; }
.alipay-frame-wrap {
  margin: 12px auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
/* 支付宝 page_pay：二维码在官方页左上角 220×220，裁切展示 */
.alipay-frame-clip {
  position: relative;
  width: 220px;
  height: 220px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #fff;
}
.alipay-frame {
  position: absolute;
  left: 0;
  top: 0;
  width: 1200px;
  height: 800px;
  border: 0;
  transform-origin: 0 0;
}
.open-link {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--accent);
}
.pay-modal .tip { color: var(--muted); font-size: 0.88rem; }
.pay-modal .actions { display: flex; gap: 10px; justify-content: center; margin-top: 14px; flex-wrap: wrap; }

.site-footer {
  border-top: 2px solid var(--border);
  margin-top: 20px;
  padding: 28px 0 36px;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
  background: rgba(243, 234, 215, 0.7);
}
.site-footer .brand-mini {
  font-size: 1.1rem;
  color: var(--ink);
  letter-spacing: 0.25em;
  margin-bottom: 8px;
}

.list-toolbar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.child-cats { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.child-cats a {
  border: 1px solid var(--border);
  padding: 4px 12px;
  color: var(--ink-soft);
  background: var(--card-bg);
}

@media (max-width: 960px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .book-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .side-panel { position: static; }
}
@media (max-width: 640px) {
  .header-inner { justify-content: center; text-align: center; }
  .nav { justify-content: center; }
  .cat-grid, .book-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .hero { padding: 32px 0 18px; }
  .hero h1 { letter-spacing: 0.12em; }
  .search-form { width: 100%; }
}