/* ==========================================================================
   通宝TB777 共享外壳样式 /assets/site.css
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd { margin: 0; }

img, svg, video { display: block; max-width: 100%; height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }

[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --tb-paper: #E8E1D3;
  --tb-paper-deep: #D6CCB8;
  --tb-ink: #1E2A3A;
  --tb-copper: #2F6B5E;
  --tb-copper-lit: #3A9D8A;
  --tb-gold: #B08D57;
  --tb-cinnabar: #C1473B;
  --tb-violet: #4A3F6B;
  --tb-graphite: #3B3B3B;
  --tb-sand: #BFB49C;

  --tb-rail-w: 104px;
  --tb-mast-h: 72px;
  --tb-maxw: 1180px;

  --tb-font-head: Georgia, "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
  --tb-font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --tb-font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (max-width: 1080px) {
  :root { --tb-mast-h: 62px; }
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-top: var(--tb-mast-h);
  padding-left: var(--tb-rail-w);
  color: var(--tb-ink);
  font-family: var(--tb-font-body);
  font-size: 17px;
  line-height: 1.75;
  background-color: var(--tb-paper);
  background-image:
    radial-gradient(circle at 16% 10%, rgba(47, 107, 94, 0.075), transparent 46%),
    radial-gradient(circle at 84% 74%, rgba(176, 141, 87, 0.10), transparent 44%),
    repeating-linear-gradient(0deg, rgba(30, 42, 58, 0.026) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(30, 42, 58, 0.02) 0 1px, transparent 1px 4px);
  background-attachment: fixed;
}

@media (max-width: 1080px) {
  body { padding-left: 0; }
}

h1, h2, h3, h4 {
  font-family: var(--tb-font-head);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--tb-ink);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); margin-bottom: 0.5em; }
h2 { font-size: clamp(1.625rem, 3.2vw, 2.5rem); margin-bottom: 0.6em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); margin-bottom: 0.6em; }
h4 { font-size: 1.125rem; margin-bottom: 0.6em; }

p { margin-bottom: 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--tb-copper); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--tb-copper-lit); }

:focus-visible {
  outline: 2px solid var(--tb-copper-lit);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: rgba(58, 157, 138, 0.28); }

/* ---------- 跳转链接 ---------- */
.tb-skip {
  position: fixed;
  left: 14px;
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 3px;
  background: var(--tb-ink);
  color: var(--tb-paper);
  font-size: 0.875rem;
  text-decoration: none;
  transition: top 0.18s ease;
}

.tb-skip:focus { top: 12px; color: var(--tb-paper); }

/* ---------- 页头 ---------- */
.tb-masthead {
  position: fixed;
  top: 0;
  left: var(--tb-rail-w);
  right: 0;
  height: var(--tb-mast-h);
  z-index: 60;
  display: flex;
  align-items: center;
  background: rgba(232, 225, 211, 0.97);
  border-bottom: 1px solid rgba(30, 42, 58, 0.16);
}

.tb-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background-image: repeating-linear-gradient(90deg, rgba(30, 42, 58, 0.32) 0 1px, transparent 1px 14px);
  opacity: 0.42;
  pointer-events: none;
}

.tb-masthead__inner {
  width: 100%;
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  padding-inline: clamp(16px, 2.6vw, 36px);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
}

.tb-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  color: var(--tb-ink);
  text-decoration: none;
}

.tb-brand:hover { color: var(--tb-copper); }

.tb-brand__seal {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: 5px;
  background: var(--tb-cinnabar);
  color: var(--tb-paper);
  font-family: var(--tb-font-head);
  font-size: 1.15rem;
  font-weight: 700;
  transform: rotate(-3.5deg);
  box-shadow: inset 0 0 0 1px rgba(232, 225, 211, 0.5);
  transition: transform 0.2s ease;
}

.tb-brand:hover .tb-brand__seal { transform: rotate(0deg); }

.tb-brand__text { display: flex; flex-direction: column; line-height: 1.2; }

.tb-brand__name {
  font-family: var(--tb-font-head);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.tb-brand__claim {
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--tb-graphite);
}

.tb-masthead__meta {
  display: flex;
  gap: 1.1rem;
  margin: 0;
  margin-left: auto;
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--tb-graphite);
}

.tb-masthead__code { white-space: nowrap; }

.tb-masthead__code::before {
  content: "◆";
  margin-right: 0.45em;
  font-size: 0.6rem;
  color: var(--tb-gold);
  vertical-align: 0.1em;
}

.tb-masthead__actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-left: auto;
}

.tb-masthead__cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5em 0.95em;
  border: 1px solid var(--tb-copper);
  border-radius: 3px;
  color: var(--tb-copper);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.tb-masthead__cta:hover {
  background: var(--tb-copper);
  border-color: var(--tb-copper);
  color: var(--tb-paper);
}

.tb-navtoggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5em 0.75em;
  border: 1px solid rgba(30, 42, 58, 0.3);
  border-radius: 3px;
  background: transparent;
  color: var(--tb-ink);
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.tb-navtoggle:hover { border-color: var(--tb-copper); color: var(--tb-copper); }
.tb-navtoggle[aria-expanded="true"] { background: rgba(47, 107, 94, 0.12); border-color: var(--tb-copper); color: var(--tb-copper); }

.tb-navtoggle__label { line-height: 1; }

.tb-navtoggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.tb-navtoggle__bars::before,
.tb-navtoggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease, bottom 0.2s ease;
}

.tb-navtoggle__bars::before { top: 0; }
.tb-navtoggle__bars::after { bottom: 0; }

.tb-navtoggle[aria-expanded="true"] .tb-navtoggle__bars::before { top: 4px; transform: rotate(45deg); }
.tb-navtoggle[aria-expanded="true"] .tb-navtoggle__bars::after { bottom: 4px; transform: rotate(-45deg); }

/* ---------- 滚动进度 ---------- */
.tb-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.tb-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--tb-copper), var(--tb-copper-lit) 55%, var(--tb-gold));
  transition: transform 0.12s linear;
}

/* ---------- 侧边轨道导航 ---------- */
.tb-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--tb-rail-w);
  z-index: 70;
  display: flex;
  flex-direction: column;
  padding: 18px 10px 16px;
  overflow-y: auto;
  background: var(--tb-ink);
  background-image:
    radial-gradient(circle at 50% 0%, rgba(58, 157, 138, 0.22), transparent 55%),
    radial-gradient(circle at 50% 100%, rgba(176, 141, 87, 0.16), transparent 50%);
  color: var(--tb-paper);
  border-right: 2px solid rgba(176, 141, 87, 0.45);
}

.tb-rail::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 92px;
  bottom: 118px;
  width: 1px;
  background-image: repeating-linear-gradient(180deg, rgba(176, 141, 87, 0.55) 0 7px, transparent 7px 15px);
  pointer-events: none;
}

.tb-rail__title {
  margin: 0 0 12px;
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  text-align: center;
  color: rgba(232, 225, 211, 0.55);
}

.tb-rail__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tb-rail__list a {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px;
  border: 1px solid rgba(176, 141, 87, 0.28);
  border-radius: 4px;
  color: rgba(232, 225, 211, 0.82);
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.tb-rail__list a:hover {
  background: rgba(58, 157, 138, 0.14);
  border-color: var(--tb-copper-lit);
  color: var(--tb-paper);
  transform: translateX(2px);
}

.tb-rail__list a[aria-current="page"] {
  background: var(--tb-copper);
  border-color: var(--tb-copper-lit);
  color: var(--tb-paper);
}

.tb-rail__list a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 3px;
  height: 60%;
  transform: translateY(-50%);
  background: var(--tb-gold);
  border-radius: 2px;
}

.tb-rail__idx {
  font-family: var(--tb-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--tb-gold);
}

.tb-rail__list a[aria-current="page"] .tb-rail__idx { color: rgba(232, 225, 211, 0.88); }

.tb-rail__label {
  font-size: 0.8125rem;
  line-height: 1.35;
  letter-spacing: 0.06em;
  text-align: center;
}

.tb-rail__foot {
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(176, 141, 87, 0.3);
  font-family: var(--tb-font-mono);
  font-size: 0.625rem;
  line-height: 1.7;
  letter-spacing: 0.04em;
  text-align: center;
  color: rgba(232, 225, 211, 0.42);
}

/* ---------- 遮罩 ---------- */
.tb-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  display: none;
  background: rgba(30, 42, 58, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s ease, visibility 0.24s ease;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.tb-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  border-top: 4px solid var(--tb-copper);
  background-color: var(--tb-ink);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(58, 157, 138, 0.2), transparent 44%),
    radial-gradient(circle at 88% 100%, rgba(176, 141, 87, 0.18), transparent 48%),
    repeating-linear-gradient(0deg, rgba(232, 225, 211, 0.03) 0 1px, transparent 1px 4px);
  color: rgba(232, 225, 211, 0.86);
}

.tb-footer__inner {
  padding-block: clamp(36px, 5vw, 64px) clamp(20px, 3vw, 30px);
}

.tb-footer__top {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.4fr;
  gap: clamp(22px, 3vw, 44px);
}

.tb-footer__col { min-width: 0; }

.tb-footer__seal {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 0.7rem;
  border-radius: 6px;
  background: var(--tb-cinnabar);
  color: var(--tb-paper);
  font-family: var(--tb-font-head);
  font-size: 1.4rem;
  font-weight: 700;
  transform: rotate(-3deg);
  box-shadow: inset 0 0 0 1px rgba(232, 225, 211, 0.35);
}

.tb-footer__wordmark {
  margin: 0 0 0.3em;
  font-family: var(--tb-font-head);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--tb-paper);
}

.tb-footer__tagline {
  margin: 0 0 1em;
  font-size: 0.875rem;
  color: rgba(232, 225, 211, 0.7);
}

.tb-footer__stamp {
  display: inline-block;
  padding: 0.4em 0.75em;
  border: 1px dashed rgba(176, 141, 87, 0.55);
  border-radius: 3px;
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--tb-gold);
}

.tb-footer__heading {
  margin: 0 0 1em;
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--tb-gold);
}

.tb-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55em;
  font-size: 0.9375rem;
}

.tb-footer__link {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  color: rgba(232, 225, 211, 0.85);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.tb-footer__link:hover {
  color: var(--tb-copper-lit);
  border-bottom-color: var(--tb-copper-lit);
}

.tb-footer__contact {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.5em 1em;
  margin: 0 0 1em;
  font-size: 0.875rem;
}

.tb-footer__contact dt {
  padding-top: 0.28em;
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--tb-gold);
}

.tb-footer__contact dd {
  margin: 0;
  color: rgba(232, 225, 211, 0.88);
  overflow-wrap: anywhere;
}

.tb-footer__note {
  margin: 0 0 1em;
  padding-left: 0.85em;
  border-left: 2px solid rgba(176, 141, 87, 0.55);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(232, 225, 211, 0.62);
}

.tb-footer__cta { margin-top: 0.2em; }

.tb-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8em 1.6em;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(16px, 2vw, 24px);
  border-top: 1px dashed rgba(176, 141, 87, 0.35);
}

.tb-footer__copy,
.tb-footer__legal {
  margin: 0;
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(232, 225, 211, 0.6);
}

.tb-totop {
  padding: 0.55em 0.95em;
  border: 1px solid rgba(176, 141, 87, 0.5);
  border-radius: 3px;
  background: transparent;
  color: var(--tb-gold);
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, opacity 0.2s ease, visibility 0.2s ease;
}

.tb-totop:hover { background: var(--tb-gold); color: var(--tb-ink); }

.tb-totop[data-visible="false"] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* ==========================================================================
   通用版式组件
   ========================================================================== */
.tb-container {
  width: 100%;
  max-width: var(--tb-maxw);
  margin: 0 auto;
  padding-inline: clamp(18px, 3.2vw, 44px);
}

.tb-main {
  display: block;
  padding-block: clamp(30px, 4.5vw, 64px) clamp(56px, 8vw, 110px);
}

.tb-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75em;
  margin: 0 0 1rem;
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  color: var(--tb-copper);
}

.tb-eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--tb-gold);
}

.tb-rule {
  height: 0;
  margin: clamp(28px, 4vw, 52px) 0;
  border: 0;
  border-top: 1px dashed rgba(30, 42, 58, 0.28);
}

.tb-num {
  font-family: var(--tb-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.tb-note {
  padding: 0.15em 0 0.15em 0.9em;
  border-left: 2px solid var(--tb-gold);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--tb-graphite);
}

.tb-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.28em 0.62em;
  border: 1px solid rgba(30, 42, 58, 0.22);
  border-radius: 2px;
  background: rgba(214, 204, 184, 0.5);
  color: var(--tb-graphite);
  font-family: var(--tb-font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.tb-tag--copper {
  border-color: var(--tb-copper);
  background: rgba(47, 107, 94, 0.1);
  color: var(--tb-copper);
}

.tb-tag--cinnabar {
  border-color: var(--tb-cinnabar);
  background: rgba(193, 71, 59, 0.08);
  color: var(--tb-cinnabar);
}

.tb-tag--violet {
  border-color: var(--tb-violet);
  background: rgba(74, 63, 107, 0.1);
  color: var(--tb-violet);
}

/* 网格 */
.tb-grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 30px);
}

.tb-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.tb-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tb-grid--split { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }

/* 折页卡片 */
.tb-card {
  position: relative;
  padding: clamp(16px, 2vw, 26px);
  padding-left: clamp(22px, 2.4vw, 32px);
  border: 1px solid rgba(30, 42, 58, 0.14);
  border-radius: 6px;
  background: rgba(232, 225, 211, 0.72);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.tb-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--tb-copper), var(--tb-gold));
  opacity: 0.85;
}

.tb-card:hover {
  border-color: rgba(47, 107, 94, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -20px rgba(30, 42, 58, 0.6);
}

.tb-card__head { margin-bottom: 0.6em; }

.tb-card__title {
  margin: 0 0 0.3em;
  font-family: var(--tb-font-head);
  font-size: 1.125rem;
}

.tb-card__meta {
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--tb-gold);
}

.tb-card__body {
  font-size: 0.9375rem;
  color: var(--tb-graphite);
}

/* 表格 */
.tb-table__wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid rgba(30, 42, 58, 0.14);
  border-radius: 6px;
  background: rgba(232, 225, 211, 0.6);
}

.tb-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.tb-table caption {
  padding: 0 0 0.6em;
  text-align: left;
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--tb-graphite);
}

.tb-table th,
.tb-table td {
  padding: 0.7em 0.85em;
  border-bottom: 1px solid rgba(30, 42, 58, 0.14);
  text-align: left;
  vertical-align: top;
}

.tb-table thead th {
  background: rgba(176, 141, 87, 0.16);
  border-bottom: 1px solid rgba(176, 141, 87, 0.5);
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--tb-ink);
}

.tb-table tbody tr:nth-child(even) { background: rgba(214, 204, 184, 0.35); }
.tb-table tbody tr:last-child td { border-bottom: 0; }

/* 图片容器 */
.tb-media {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(30, 42, 58, 0.12);
  border-radius: 8px;
  background: linear-gradient(135deg, var(--tb-paper-deep), rgba(47, 107, 94, 0.2));
  aspect-ratio: 16 / 10;
}

.tb-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tb-media--tall { aspect-ratio: 3 / 4; }
.tb-media--wide { aspect-ratio: 21 / 9; }
.tb-media--square { aspect-ratio: 1 / 1; }

.tb-media__caption {
  margin-top: 0.6em;
  font-family: var(--tb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--tb-graphite);
}

/* 按钮 */
.tb-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.72em 1.3em;
  border: 1px solid var(--tb-copper);
  border-radius: 3px;
  background: transparent;
  color: var(--tb-copper);
  font-family: var(--tb-font-body);
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.tb-btn:hover {
  background: var(--tb-copper);
  color: var(--tb-paper);
  transform: translateY(-1px);
}

.tb-btn--solid {
  background: var(--tb-copper);
  color: var(--tb-paper);
}

.tb-btn--solid:hover {
  background: var(--tb-copper-lit);
  border-color: var(--tb-copper-lit);
  color: var(--tb-ink);
}

.tb-btn--gold {
  border-color: var(--tb-gold);
  color: var(--tb-gold);
}

.tb-btn--gold:hover {
  background: var(--tb-gold);
  color: var(--tb-ink);
}

/* 面包屑 */
.tb-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  margin: 0 0 clamp(16px, 2vw, 26px);
  font-family: var(--tb-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--tb-graphite);
}

.tb-breadcrumb a { color: var(--tb-copper); text-decoration: none; }
.tb-breadcrumb a:hover { text-decoration: underline; }
.tb-breadcrumb__sep { color: var(--tb-sand); }
.tb-breadcrumb [aria-current="page"] { color: var(--tb-ink); }

/* 渐显 */
.tb-js [data-reveal] { opacity: 1; }

@media (prefers-reduced-motion: no-preference) {
  .tb-js [data-reveal] {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .tb-js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .tb-masthead { left: 0; }

  .tb-navtoggle { display: inline-flex; }

  .tb-rail {
    width: min(84vw, 330px);
    padding: 24px 18px 20px;
    transform: translateX(-104%);
    box-shadow: 14px 0 34px rgba(30, 42, 58, 0.32);
    transition: transform 0.28s ease;
  }

  .tb-rail[data-open] { transform: translateX(0); }
  .tb-rail::before { display: none; }

  .tb-rail__title { text-align: left; letter-spacing: 0.24em; }

  .tb-rail__list a {
    flex-direction: row;
    justify-content: flex-start;
    gap: 14px;
    padding: 13px 12px;
  }

  .tb-rail__list a:hover { transform: translateX(0); }

  .tb-rail__list a[aria-current="page"]::before {
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    transform: none;
  }

  .tb-rail__label { font-size: 1rem; text-align: left; }
  .tb-rail__foot { text-align: left; }

  .tb-scrim { display: block; }
  .tb-scrim[data-open] { opacity: 1; visibility: visible; }

  html.tb-nav-open body { overflow: hidden; }

  .tb-footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .tb-masthead__meta { display: none; }

  .tb-grid--2,
  .tb-grid--3,
  .tb-grid--split { grid-template-columns: minmax(0, 1fr); }

  .tb-grid--2 > * { min-width: 0; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .tb-masthead__cta { display: none; }
  .tb-brand__claim { display: none; }

  .tb-footer__top { grid-template-columns: minmax(0, 1fr); }
  .tb-footer__base { justify-content: flex-start; }
  .tb-footer__contact { grid-template-columns: minmax(0, 1fr); gap: 0.2em; }
  .tb-footer__contact dd { margin-bottom: 0.6em; }
}

@media (max-width: 420px) {
  .tb-navtoggle__label { display: none; }
  .tb-brand__seal { width: 34px; height: 34px; font-size: 1.05rem; }
  .tb-brand__name { font-size: 1.05rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .tb-rail { transition: none; }
  .tb-progress__fill { transition: none; }
}