/* =============================================================
   components.css
   职责：可复用组件 —— 玻璃材质、按钮、标签、封面、卡片、
        模态框内容排版、代码块、空状态、返回顶部、Toast
   ============================================================= */

/* -------------------------------------------------------------
   1. 玻璃材质核心
      三层叠加：① 半透明底 + backdrop-filter 模糊
               ② ::before 渐变描边（上亮下暗，模拟玻璃厚度）
               ③ ::after 斜向高光（模拟环境光反射）
   ------------------------------------------------------------- */
.glass,
.glass-soft {
  position: relative;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--blur-lg)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-lg)) saturate(var(--glass-saturate));
  /* 必须显式带上 opacity：本规则加载在 .reveal 之后，
     单属性 transition 会整体覆盖 .reveal 的过渡，
     导致玻璃容器（hero eyebrow / about / footer）入场时
     opacity 直接跳变，与卡片的 stagger 淡入不一致。
     曲线与 .reveal 保持一致。 */
  transition:
    background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    opacity var(--dur-slow) var(--ease-out);
}

.glass-soft {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: blur(var(--blur-sm)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-sm)) saturate(var(--glass-saturate));
}

/* 渐变描边：用 mask 抠掉内部，只留 1px 边框 */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    160deg,
    var(--glass-brd-top) 0%,
    rgba(255, 255, 255, 0.10) 28%,
    transparent 55%,
    var(--glass-brd-bottom) 100%
  );
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.glass-soft::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft);
  pointer-events: none;
}

/* 斜向环境高光 + 顶部 1px 折射亮线 */
.glass::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  background:
    linear-gradient(
      115deg,
      var(--glass-sheen) 0%,
      transparent 32%,
      transparent 66%,
      var(--glass-sheen-2) 100%
    );
  box-shadow: inset 0 1px 0 var(--glass-inner-line);
  pointer-events: none;
}

/* 玻璃内部的实际内容需要盖在高光层之上 */
.glass > * { position: relative; z-index: 2; }

/* Hero 装饰卡片的额外色彩倾向 */
.glass--tint1 { background: linear-gradient(140deg, rgba(110, 168, 255, 0.18), var(--glass-bg)); }
.glass--tint2 { background: linear-gradient(140deg, rgba(181, 139, 255, 0.18), var(--glass-bg)); }
.glass--tint3 { background: linear-gradient(140deg, rgba(92, 225, 214, 0.18), var(--glass-bg)); }

/* -------------------------------------------------------------
   2. 按钮
   ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition:
    transform var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.btn:hover { transform: translate3d(0, -2px, 0); }
.btn:active { transform: translate3d(0, 0, 0) scale(0.98); }
.btn .icon { width: 17px; height: 17px; }

.btn--primary {
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 8px 26px rgba(110, 168, 255, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}
.btn--primary:hover { box-shadow: 0 14px 34px rgba(110, 168, 255, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.55); }

.btn--ghost {
  position: relative;
  overflow: hidden;
  color: var(--text-1);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-md)) saturate(var(--glass-saturate));
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft), var(--shadow-1);
}
.btn--ghost:hover { background: var(--glass-bg-hover); }

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-1);
  box-shadow: var(--shadow-1);
  transition: transform var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.icon-btn:hover { transform: translate3d(0, -2px, 0); background: var(--glass-bg-hover); }
.icon-btn .icon { width: 19px; height: 19px; }

/* 主题按钮：根据主题显示对应图标 */
#themeToggle .icon--moon { display: none; }
[data-theme="dark"] #themeToggle .icon--sun { display: none; }
[data-theme="dark"] #themeToggle .icon--moon { display: block; }

.link-btn {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-btn:hover { color: var(--accent-2); }

/* -------------------------------------------------------------
   3. 搜索框
   ------------------------------------------------------------- */
.searchbox {
  display: flex;
  align-items: center;
  gap: 8px;
  width: clamp(180px, 26vw, 300px);
  height: 40px;
  padding: 0 12px;
  border-radius: var(--r-pill);
  transition: background-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.searchbox:focus-within {
  background: var(--glass-bg-hover);
  box-shadow: inset 0 0 0 1px var(--accent), 0 0 0 4px rgba(110, 168, 255, 0.16);
}

.searchbox__icon { width: 16px; height: 16px; color: var(--text-3); flex: none; }

.searchbox__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: none;
  font-size: 14px;
  color: var(--text-1);
}
.searchbox__input::placeholder { color: var(--text-3); }
.searchbox__input:focus { outline: none; }
.searchbox__input::-webkit-search-cancel-button { display: none; }

.searchbox__clear {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  flex: none;
  border-radius: 50%;
  color: var(--text-2);
  background: var(--hairline);
}
.searchbox__clear:hover { color: var(--text-1); background: var(--glass-brd-soft); }
.searchbox__clear .icon { width: 12px; height: 12px; stroke-width: 2.4; }
/* 组件自身设置了 display:grid，需显式还原 hidden 的语义 */
.searchbox__clear[hidden] { display: none; }

/* -------------------------------------------------------------
   4. 分类筛选芯片
   ------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: none;
  padding: 9px 17px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 550;
  color: var(--text-2);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-md)) saturate(var(--glass-saturate));
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft);
  transition:
    transform var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease);
}
.chip:hover { transform: translate3d(0, -2px, 0); color: var(--text-1); background: var(--glass-bg-hover); }

.chip__count {
  padding: 1px 7px;
  border-radius: var(--r-pill);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  color: var(--text-3);
  background: var(--hairline);
}

.chip.is-active {
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 8px 24px rgba(110, 168, 255, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.chip.is-active .chip__count { color: var(--accent-ink); background: rgba(255, 255, 255, 0.28); }

/* -------------------------------------------------------------
   5. 文章卡片
   ------------------------------------------------------------- */
.card {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 12px 12px 20px;
  border-radius: var(--r-lg);
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow-1);
}
.card-shell:hover .card {
  background: var(--glass-bg-hover);
  box-shadow: var(--shadow-2);
}

/* -- 封面：完全用 CSS 渐变生成的抽象图形，无外链图片 -- */
.cover {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-md);
  background:
    radial-gradient(120% 120% at 18% 18%, var(--c1) 0%, transparent 58%),
    radial-gradient(100% 100% at 84% 26%, var(--c2) 0%, transparent 60%),
    linear-gradient(140deg, var(--c3) 0%, var(--c1) 100%);
  isolation: isolate;
}

/* 覆盖纹理：按 data-variant 切换 */
.cover::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.55;
  background-repeat: repeat;
  background-size: 28px 28px;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.16) 1px, transparent 1px);
}
.cover[data-variant="rings"]::before {
  background-image: repeating-radial-gradient(circle at 30% 70%, rgba(255, 255, 255, 0.20) 0 1px, transparent 1px 18px);
  background-size: auto;
}
.cover[data-variant="waves"]::before {
  background-image: repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.18) 0 2px, transparent 2px 16px);
  background-size: auto;
}
.cover[data-variant="dots"]::before {
  background-image: radial-gradient(rgba(255, 255, 255, 0.30) 1.4px, transparent 1.6px);
  background-size: 16px 16px;
}
.cover[data-variant="beam"]::before {
  background-image: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.34) 48%, transparent 56%);
  background-size: auto;
}
.cover[data-variant="mesh"]::before {
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.34) 0 2px, transparent 3px),
    radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.28) 0 2px, transparent 3px),
    linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 90px 90px, 70px 70px, 30px 30px, 30px 30px;
}

/* 悬停时扫过的高光 */
.cover::after {
  content: "";
  position: absolute;
  inset: -40%;
  background: linear-gradient(75deg, transparent 40%, rgba(255, 255, 255, 0.30) 50%, transparent 60%);
  transform: translate3d(-30%, 0, 0);
  opacity: 0;
  transition: transform 700ms var(--ease), opacity var(--dur) var(--ease);
}
.card-shell:hover .cover::after {
  opacity: 1;
  transform: translate3d(30%, 0, 0);
}

.cover__badge {
  position: absolute;
  bottom: 10px;
  left: 10px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: var(--r-pill);
  font-size: 11.5px;
  font-weight: 600;
  color: #fff;
  background: rgba(10, 14, 26, 0.42);
  -webkit-backdrop-filter: blur(10px) saturate(160%);
  backdrop-filter: blur(10px) saturate(160%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}
.cover__badge .icon { width: 12px; height: 12px; }

/* -- 卡片正文 -- */
.card__body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  padding: 18px 10px 0;
}

.card__title {
  font-size: 18.5px;
  font-weight: 620;
  line-height: 1.42;
  letter-spacing: -0.02em;
  transition: color var(--dur-fast) var(--ease);
}
.card-shell:hover .card__title { color: var(--accent); }

.card__excerpt {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.tag {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-size: 11.5px;
  font-weight: 550;
  color: var(--text-2);
  background: var(--hairline);
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.tag:hover { color: var(--accent); background: var(--glass-bg-strong); }

.card__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding-top: 18px;
  font-size: 12.5px;
  color: var(--text-3);
}

.avatar {
  display: block;
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.meta-item { display: inline-flex; align-items: center; gap: 5px; }
.meta-item .icon { width: 13px; height: 13px; }
.card__meta .sep { color: var(--text-3); opacity: 0.5; }

/* -------------------------------------------------------------
   6. 空状态
   ------------------------------------------------------------- */
.empty {
  padding: 56px 24px;
  border-radius: var(--r-xl);
  text-align: center;
  box-shadow: var(--shadow-1);
}
.empty[hidden] { display: none; }
.empty__icon { width: 34px; height: 34px; margin: 0 auto 14px; color: var(--text-3); }
.empty__title { font-size: 19px; }
.empty__desc { margin-top: 8px; font-size: 14px; color: var(--text-2); }

/* -------------------------------------------------------------
   7. 文章详情（模态框内容）
   ------------------------------------------------------------- */
.article { padding-bottom: 8px; }

/* 详情头部封面 */
.article__cover {
  position: relative;
  height: clamp(160px, 26vh, 240px);
  overflow: hidden;
  background:
    radial-gradient(120% 120% at 18% 18%, var(--c1) 0%, transparent 58%),
    radial-gradient(100% 100% at 84% 26%, var(--c2) 0%, transparent 60%),
    linear-gradient(140deg, var(--c3) 0%, var(--c1) 100%);
}
.article__cover::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image: repeating-radial-gradient(circle at 30% 70%, rgba(255, 255, 255, 0.20) 0 1px, transparent 1px 20px);
}
/* 封面与正文之间的柔和过渡 */
.article__cover::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 70%;
  background: linear-gradient(180deg, transparent, var(--glass-bg) 92%);
}

.article__head {
  padding: 4px clamp(20px, 5vw, 56px) 0;
  margin-top: -46px;
  position: relative;
  z-index: 3;
}

.article__cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  font-size: 12.5px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 20px rgba(110, 168, 255, 0.32);
}
.article__cat .icon { width: 13px; height: 13px; }

.article__title {
  margin-top: 18px;
  font-size: clamp(25px, 4.2vw, 38px);
  font-weight: 700;
  letter-spacing: -0.035em;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--text-2);
}
.article__author { display: inline-flex; align-items: center; gap: 9px; }
.article__author .avatar { width: 32px; height: 32px; }
.article__author b { font-weight: 600; color: var(--text-1); }

.article__tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }

.article__rule {
  height: 1px;
  margin: 28px 0 0;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--hairline) 15%, var(--hairline) 85%, transparent);
}

/* 正文排版 */
.prose {
  padding: 26px clamp(20px, 5vw, 56px) 40px;
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--text-1);
}

.prose > * + * { margin-top: 20px; }

.prose h2 {
  margin-top: 42px;
  font-size: clamp(20px, 2.6vw, 24px);
  letter-spacing: -0.025em;
  scroll-margin-top: 80px;
}
.prose h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 0.92em;
  margin-right: 10px;
  vertical-align: -0.12em;
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

.prose h3 {
  margin-top: 32px;
  font-size: 18px;
  color: var(--text-1);
}

.prose p { color: var(--text-1); }

.prose strong { font-weight: 650; color: var(--text-1); }

.prose ul,
.prose ol {
  padding-left: 4px;
}
.prose li {
  position: relative;
  padding-left: 26px;
  margin-top: 10px;
  color: var(--text-1);
}
.prose ul li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.prose ol { counter-reset: ol; }
.prose ol li { counter-increment: ol; }
.prose ol li::before {
  content: counter(ol);
  position: absolute;
  top: 0.06em;
  left: 0;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent);
  background: var(--hairline);
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 引用块 */
.prose blockquote {
  position: relative;
  padding: 20px 24px 20px 26px;
  border-radius: var(--r-md);
  font-size: 15.5px;
  color: var(--text-2);
  background: var(--glass-bg);
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft), inset 3px 0 0 var(--accent);
}
.prose blockquote p { color: inherit; }

/* 提示块 */
.callout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  font-size: 14.5px;
  color: var(--text-2);
  background: var(--glass-bg);
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft);
}
.callout .icon { width: 18px; height: 18px; margin-top: 3px; color: var(--accent); }

/* 行内代码 */
.inline-code {
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.88em;
  color: var(--accent);
  background: var(--hairline);
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft);
  word-break: break-word;
}

/* -------------------------------------------------------------
   8. 代码块
   ------------------------------------------------------------- */
.code {
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--code-bg);
  -webkit-backdrop-filter: blur(var(--blur-sm)) saturate(140%);
  backdrop-filter: blur(var(--blur-sm)) saturate(140%);
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft), var(--shadow-1);
}

.code__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 10px 9px 16px;
  border-bottom: 1px solid var(--hairline);
}
.code__lang {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.code__copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: var(--r-sm);
  font-size: 12px;
  font-weight: 550;
  color: var(--text-2);
  background: var(--hairline);
  transition: color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.code__copy:hover { color: var(--text-1); background: var(--glass-brd-soft); }
.code__copy .icon { width: 13px; height: 13px; }
.code__copy.is-done { color: var(--accent); }

.code pre {
  margin: 0;
  padding: 16px 18px 18px;
  overflow-x: auto;
  font-size: 13.2px;
  line-height: 1.78;
  tab-size: 2;
  color: var(--text-1);
}
.code code { white-space: pre; }

/* 高亮 token 配色（由 highlight.js 生成的 span 类名） */
.tok-comment  { color: var(--tok-comment); font-style: italic; }
.tok-string   { color: var(--tok-string); }
.tok-number   { color: var(--tok-number); }
.tok-keyword  { color: var(--tok-keyword); font-weight: 550; }
.tok-literal  { color: var(--tok-literal); }
.tok-fn       { color: var(--tok-fn); }
.tok-op       { color: var(--tok-op); }
.tok-punc     { color: var(--tok-punc); }
.tok-tag      { color: var(--tok-tag); }
.tok-attr     { color: var(--tok-attr); }
.tok-prop     { color: var(--tok-prop); }
.tok-at       { color: var(--tok-at); font-weight: 550; }
.tok-selector { color: var(--tok-selector); }
.tok-hex      { color: var(--tok-hex); }

/* 以下 token 复用已有配色的语义槽位 */
.tok-url      { color: var(--tok-string); }
.tok-builtin  { color: var(--tok-fn); }
.tok-var      { color: var(--tok-attr); }
.tok-flag     { color: var(--tok-at); }
.tok-type     { color: var(--tok-literal); }

/* -------------------------------------------------------------
   9. 上一篇 / 下一篇
   ------------------------------------------------------------- */
.article__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 8px clamp(20px, 5vw, 56px) 48px;
}

.pager {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  text-align: left;
  background: var(--glass-bg);
  box-shadow: inset 0 0 0 1px var(--glass-brd-soft);
  transition: transform var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.pager:hover:not(:disabled) { transform: translate3d(0, -3px, 0); background: var(--glass-bg-hover); }
.pager:disabled { opacity: 0.42; cursor: not-allowed; }

.pager--prev { text-align: left; align-items: flex-start; }
.pager--next { text-align: right; align-items: flex-end; }
.pager__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-3);
}
.pager__label .icon { width: 13px; height: 13px; }
.pager__title {
  font-size: 14.5px;
  font-weight: 550;
  line-height: 1.5;
  color: var(--text-1);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* -------------------------------------------------------------
   10. 返回顶部 / Toast
   ------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  color: var(--text-1);
  box-shadow: var(--shadow-2);
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.to-top[hidden] {
  display: grid; /* 用 opacity 过渡而非 display 切换 */
  opacity: 0;
  transform: translate3d(0, 14px, 0) scale(0.9);
  pointer-events: none;
}
.to-top:hover { transform: translate3d(0, -3px, 0); background: var(--glass-bg-hover); }
.to-top .icon { width: 20px; height: 20px; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  z-index: 300;
  padding: 11px 20px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 550;
  box-shadow: var(--shadow-2);
  transform: translate3d(-50%, 12px, 0);
  opacity: 0;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.toast[hidden] { display: block; }
.toast.is-visible { opacity: 1; transform: translate3d(-50%, 0, 0); }