/* ============================================================
   模板展示馆 · 门户样式
   浅色卡片瀑布流
   ============================================================ */

/* ---------- 主题变量 ---------- */
:root {
  --bg: #f6f7fb;
  --bg-soft: #ffffff;
  --card-bg: #ffffff;
  --text: #1c1f26;
  --text-soft: #6b7280;
  --text-faint: #9aa1ad;
  --border: #e8eaf0;
  --border-strong: #d9dde6;
  --accent: #4f6ef7;
  --accent-soft: #eef1fe;
  --shadow-sm: 0 1px 2px rgba(24, 30, 50, .05);
  --shadow-md: 0 6px 18px rgba(24, 30, 50, .08);
  --shadow-lg: 0 16px 40px rgba(24, 30, 50, .14);
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 64px;
  --maxw: 1280px;
}

/* 深色主题 */
html[data-theme="dark"] {
  --bg: #14161c;
  --bg-soft: #1b1e26;
  --card-bg: #1e222b;
  --text: #eef0f5;
  --text-soft: #a3aab8;
  --text-faint: #767e8d;
  --border: #2a2f3a;
  --border-strong: #363c49;
  --accent: #7d93ff;
  --accent-soft: #232a44;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, .35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, .5);
}

/* ---------- 基础重置 ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

a { color: inherit; text-decoration: none; }

button { font-family: inherit; cursor: pointer; }

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: .85em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 6px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg-soft) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .3px;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, #4f6ef7, #8b5cf6);
  color: #fff;
  font-size: 15px;
  box-shadow: 0 4px 12px rgba(79, 110, 247, .35);
}

/* 搜索框 */
.search-box {
  position: relative;
  flex: 1;
  max-width: 460px;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 14px;
  font-size: 17px;
  color: var(--text-faint);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  height: 40px;
  padding: 0 38px 0 38px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color .2s, box-shadow .2s, background .2s;
}

.search-box input::placeholder { color: var(--text-faint); }

.search-box input:focus {
  border-color: var(--accent);
  background: var(--bg-soft);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent);
}

.search-clear {
  position: absolute;
  right: 10px;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: var(--border-strong);
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1;
  display: grid;
  place-items: center;
  transition: background .2s, color .2s;
}

.search-clear:hover { background: var(--accent); color: #fff; }

.header-actions { flex-shrink: 0; }

.icon-btn {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-strong);
  border-radius: 11px;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 16px;
  display: grid;
  place-items: center;
  transition: all .2s;
}

.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ---------- 主视觉 ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 52px 24px 26px;
  text-align: center;
}

.hero-title {
  margin: 0 0 10px;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  letter-spacing: -.5px;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  margin: 0;
  color: var(--text-soft);
  font-size: 14.5px;
}

.hero-sub strong { color: var(--accent); font-weight: 700; }

/* ---------- 分类筛选 ---------- */
.filters {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.filter-chip {
  padding: 7px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 13.5px;
  font-weight: 500;
  transition: all .2s;
  white-space: nowrap;
}

.filter-chip:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 35%, transparent);
}

.filter-chip .chip-count {
  margin-left: 6px;
  opacity: .65;
  font-size: 12px;
}

/* ---------- 瀑布流 ---------- */
.gallery-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px 60px;
}

.gallery {
  column-count: 4;
  column-gap: 22px;
}

@media (max-width: 1180px) { .gallery { column-count: 3; } }
@media (max-width: 820px)  { .gallery { column-count: 2; } }
@media (max-width: 520px)  { .gallery { column-count: 1; } }

/* ---------- 卡片 ---------- */
.card {
  break-inside: avoid;
  margin-bottom: 22px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .28s cubic-bezier(.2, .8, .3, 1),
              box-shadow .28s ease,
              border-color .28s ease;
  animation: cardIn .45s cubic-bezier(.2, .8, .3, 1) backwards;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

/* 封面（渐变占位） */
.card-cover {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  color: #fff;
  overflow: hidden;
  isolation: isolate;
}

.card-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 12%, rgba(255, 255, 255, .28), transparent 55%),
    radial-gradient(circle at 12% 92%, rgba(0, 0, 0, .18), transparent 60%);
  z-index: -1;
}

.card-cover-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-badge {
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .22);
  border: 1px solid rgba(255, 255, 255, .3);
  backdrop-filter: blur(6px);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .4px;
}

.card-index {
  font-size: 12px;
  font-weight: 700;
  opacity: .75;
  font-variant-numeric: tabular-nums;
}

.card-cover-title {
  margin: 26px 0 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.2px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, .18);
}

.card-cover-sub {
  margin: 6px 0 0;
  font-size: 12.5px;
  opacity: .88;
  letter-spacing: .3px;
}

/* 卡片正文 */
.card-body { padding: 15px 17px 17px; }

.card-desc {
  margin: 0 0 12px;
  color: var(--text-soft);
  font-size: 13.5px;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag {
  padding: 3px 9px;
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11.5px;
  font-weight: 600;
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-faint);
  font-size: 12px;
}

.card-open {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 13px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  transition: gap .2s, filter .2s, transform .2s;
}

.card:hover .card-open { gap: 9px; filter: brightness(1.08); }

.card-open:active { transform: scale(.96); }

/* 整卡可点击 */
.card-link { display: block; }

/* ---------- 空状态 ---------- */
.empty-state {
  padding: 70px 20px;
  text-align: center;
}

.empty-icon {
  font-size: 46px;
  color: var(--text-faint);
  margin-bottom: 12px;
}

.empty-title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
}

.empty-desc {
  margin: 0 0 20px;
  color: var(--text-soft);
  font-size: 14px;
}

.btn-reset {
  padding: 9px 22px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: filter .2s, transform .2s;
}

.btn-reset:hover { filter: brightness(1.08); transform: translateY(-1px); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 24px 40px;
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
}

.site-footer p { margin: 4px 0; }

.footer-tip { font-size: 12.5px; }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 90;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 19px;
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 45%, transparent);
  transition: transform .22s, opacity .22s, filter .2s;
}

.back-top:hover { transform: translateY(-3px); filter: brightness(1.08); }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .header-inner { padding: 0 16px; gap: 12px; }
  .brand-text { display: none; }
  .hero { padding: 36px 16px 20px; }
  .filters { padding: 0 16px 20px; }
  .gallery-wrap { padding: 0 16px 44px; }
  .gallery { column-gap: 16px; }
  .card { margin-bottom: 16px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}