/* 六智宝库 - 首页专用样式
   视觉基准：home/antacid.html
   核心符号：pH 三色渐变 #C73E2A → #C89F3D → #1E6B6E */

:root {
  --radius: 14px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  /* 卡片比页面底色更亮，才能从方格纸上“浮”起来 */
  --card: #FCF6E7;
  --card-border: rgba(44, 31, 18, .13);
  --card-shadow: 0 1px 2px rgba(44, 31, 18, .05),
                 0 14px 32px -22px rgba(44, 31, 18, .40);
}

/* ============ 滚动入场（由 home.js 添加 .is-in） ============ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition-property: opacity, transform;
  transition-duration: .7s;
  transition-timing-function: cubic-bezier(.22, .61, .36, 1);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-title .line-in { animation: none; transform: none; }
  .grad { animation: none; }
  .eyebrow-dot { animation: none; }
  .rxn-left, .rxn-mid, .rxn-right, .rxn-arrow, .rxn-ph rect { animation: none !important; }
}

/* ============ 通用按钮 ============ */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.6rem;
  border-radius: 10px;
  font-size: .95rem; font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease),
              background .2s, color .2s, border-color .2s;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 2px 10px rgba(199, 62, 42, .28);
}
.btn-primary:hover {
  background: #b5351f;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(199, 62, 42, .36);
}
.btn-arrow { display: inline-block; transition: transform .22s var(--ease); }
.btn-primary:hover .btn-arrow { transform: translateX(3px); }
.btn-ghost {
  color: var(--fg);
  border-color: var(--border);
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}
.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--fg) 22%, transparent);
  background: var(--surface);
}

/* ============ Hero ============ */
.hero {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(2.75rem, 7vw, 5rem) 1.5rem clamp(2.5rem, 6vw, 4.25rem);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.25rem, 5vw, 3.5rem);
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 1.05fr .95fr; }
}

/* ---- 眉标 ---- */
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .72rem; font-weight: 600; letter-spacing: .14em;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  padding: .4rem .85rem .4rem .7rem;
  border-radius: 999px;
  margin-bottom: 1.4rem;
}
.eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(199, 62, 42, .50); }
  70%  { box-shadow: 0 0 0 8px rgba(199, 62, 42, 0); }
  100% { box-shadow: 0 0 0 0 rgba(199, 62, 42, 0); }
}

/* ---- 主标题：逐行揭示 ---- */
.hero-title {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: clamp(2.05rem, 5.2vw, 3.45rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  margin-bottom: 1.2rem;
  color: var(--fg);
}
.hero-title .line { display: block; overflow: hidden; padding-bottom: .06em; }
.hero-title .line-in {
  display: inline-block;
  transform: translateY(108%);
  animation: lineUp .9s var(--ease) forwards;
}
.hero-title .line:nth-child(1) .line-in { animation-delay: .05s; }
.hero-title .line:nth-child(2) .line-in { animation-delay: .17s; }
@keyframes lineUp { to { transform: translateY(0); } }

/* ---- pH 渐变文字 ---- */
.grad {
  font-style: normal;
  background: linear-gradient(100deg, #C73E2A 0%, #C89F3D 42%, #1E6B6E 78%, #C73E2A 100%);
  background-size: 260% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradFlow 9s linear infinite;
}
@keyframes gradFlow {
  from { background-position: 0% 50%; }
  to   { background-position: 260% 50%; }
}

.hero-sub {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--muted);
  max-width: 34em;
  margin-bottom: 1.9rem;
}
.hero-btns { display: flex; flex-wrap: wrap; gap: .8rem; }

.hero-meta {
  list-style: none;
  display: flex; flex-wrap: wrap; gap: .45rem 1.15rem;
  margin-top: 1.7rem;
  font-size: .8rem; color: var(--muted);
}
.hero-meta li { display: inline-flex; align-items: center; gap: .45rem; }
.hero-meta li::before {
  content: '';
  width: 5px; height: 5px; border-radius: 50%;
  background: color-mix(in srgb, var(--muted) 48%, transparent);
}

/* ---- 右侧实验台 ---- */
.hero-visual { position: relative; }
.lab-frame {
  position: relative;
  aspect-ratio: 1 / .92;
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background:
    radial-gradient(circle at 22% 18%, rgba(199, 62, 42, .10), transparent 55%),
    radial-gradient(circle at 78% 82%, rgba(30, 107, 110, .10), transparent 55%),
    var(--card);
  box-shadow: 0 26px 60px -30px rgba(44, 31, 18, .42),
              inset 0 0 0 1px rgba(255, 255, 255, .55);
  overflow: hidden;
}
#labCanvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.lab-caption {
  position: absolute; top: 1rem; left: 1.15rem; right: 1.15rem;
  display: flex; flex-direction: column; gap: .12rem;
  pointer-events: none;
}
.lab-caption-title {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: 1rem; font-weight: 700; color: var(--fg);
  transition: opacity .3s var(--ease);
}
.lab-caption-sub {
  font-size: .66rem; letter-spacing: .14em; color: var(--muted);
  transition: opacity .3s var(--ease);
}
/* 切换主题时文字先淡出，换好内容再淡入（由 home.js 加/去 .is-swapping） */
.lab-caption-title.is-swapping,
.lab-caption-sub.is-swapping,
.lab-link.is-swapping,
.lab-legend.is-swapping { opacity: 0; }

/* 底部区：图例在上、标签在下整体贴底；标签增多、换行时自动向上让位，不会压住图例 */
.lab-foot {
  position: absolute; left: 1.15rem; right: 1.15rem; bottom: 1rem;
  display: flex; flex-direction: column; align-items: center; gap: .55rem;
  pointer-events: none;
}
.lab-legend {
  display: flex; flex-wrap: wrap; justify-content: center; gap: .3rem .85rem;
  font-size: .7rem; color: var(--muted);
  transition: opacity .3s var(--ease);
}
.lab-legend span { display: inline-flex; align-items: center; gap: .38rem; }
.lab-legend i {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--c) 20%, transparent);
}

/* ---- 实验台主题切换（三篇解读各对应一个演示） ---- */
.lab-topics {
  display: flex; flex-wrap: wrap; justify-content: center; gap: .38rem;
  pointer-events: auto;
}
.lab-topic {
  font: inherit;
  font-size: .68rem; font-weight: 600; letter-spacing: .04em;
  padding: .26rem .62rem;
  border-radius: 999px;
  cursor: pointer;
  color: var(--muted);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  border: 1px solid var(--card-border);
  transition: color .22s, background .22s, border-color .22s, transform .22s var(--ease);
}
.lab-topic:hover {
  color: var(--fg);
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--topic-tone) 34%, transparent);
}
.lab-topic.is-active {
  color: var(--topic-tone);
  background: color-mix(in srgb, var(--topic-tone) 13%, transparent);
  border-color: color-mix(in srgb, var(--topic-tone) 36%, transparent);
}
.lab-topic:focus-visible {
  outline: 2px solid var(--topic-tone);
  outline-offset: 2px;
}

/* 演示 → 解读入口 */
.lab-link {
  align-self: flex-start;
  margin-top: .32rem;
  font-size: .72rem; font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  pointer-events: auto;
  transition: opacity .3s var(--ease), color .22s;
}
.lab-link:hover { color: var(--accent); text-decoration: underline; }
.lab-link[hidden] { display: none; }

@media (max-width: 560px) {
  .lab-legend { gap: .25rem .7rem; font-size: .66rem; }
  .lab-frame { aspect-ratio: 1 / 1.02; }
  .lab-topic { font-size: .63rem; padding: .22rem .5rem; }
}

/* ---- 向下浏览提示 ---- */
.scroll-hint { display: none; }
@media (min-width: 900px) {
  .scroll-hint {
    display: flex; flex-direction: column; align-items: center; gap: .5rem;
    width: max-content;
    margin: 2.4rem auto 0;
    text-decoration: none;
  }
  .scroll-hint-text {
    font-size: .66rem; letter-spacing: .2em;
    color: var(--muted); opacity: .7;
  }
  .scroll-hint-bar {
    position: relative; overflow: hidden;
    width: 1px; height: 40px;
    background: linear-gradient(to bottom, color-mix(in srgb, var(--muted) 40%, transparent), transparent);
  }
  .scroll-hint-bar::after {
    content: '';
    position: absolute; left: 0; top: 0;
    width: 1px; height: 14px;
    background: var(--primary);
    animation: scrollDot 2.1s var(--ease) infinite;
  }
  @keyframes scrollDot {
    0%   { transform: translateY(-14px); opacity: 0; }
    35%  { opacity: 1; }
    100% { transform: translateY(40px); opacity: 0; }
  }
}

/* ============ 区块通用 ============ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(3.25rem, 7vw, 5.25rem) 1.5rem;
}
.section.is-tinted {
  max-width: none;
  /* 比页面底色略深，形成一条“凹陷”的色带，让上面的卡片浮起来 */
  background: color-mix(in srgb, var(--surface-2) 68%, var(--bg));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section.is-tinted > .section-head,
.section.is-tinted > .feature-grid {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.section-head { max-width: 44rem; margin-bottom: clamp(1.9rem, 4vw, 2.75rem); }
.section-kicker {
  display: inline-block;
  font-size: .68rem; font-weight: 700; letter-spacing: .18em;
  color: var(--primary);
  margin-bottom: .6rem;
}
.section-head h2 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -.015em;
  margin-bottom: .55rem;
}
.section-head p { color: var(--muted); font-size: .95rem; line-height: 1.78; }

/* ============ 场景卡片 ============ */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(275px, 1fr));
  gap: 1.2rem;
}
.subject-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.7rem 1.55rem 1.45rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--tone) 7%, transparent), transparent 42%),
    var(--card);
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
/* 顶部色条 */
.subject-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(to right, var(--tone), color-mix(in srgb, var(--tone) 22%, transparent));
  opacity: .5;
  transition: opacity .3s;
}
/* 鼠标光斑 */
.subject-card::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(230px circle at var(--mx, 50%) var(--my, 0%),
              color-mix(in srgb, var(--tone) 13%, transparent), transparent 70%);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.subject-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--tone) 38%, transparent);
  box-shadow: 0 2px 4px rgba(44, 31, 18, .05),
              0 28px 54px -26px color-mix(in srgb, var(--tone) 58%, rgba(44, 31, 18, .45));
}
.subject-card:hover::before { opacity: 1; }
.subject-card:hover::after { opacity: 1; }

.subject-badge {
  position: absolute; top: 1.05rem; right: 1.05rem;
  font-size: .63rem; font-weight: 700; letter-spacing: .1em;
  padding: .22rem .58rem;
  border-radius: 999px;
  color: var(--tone);
  background: color-mix(in srgb, var(--tone) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--tone) 26%, transparent);
}
.subject-badge.is-soon {
  color: var(--muted);
  background: color-mix(in srgb, var(--muted) 9%, transparent);
  border-color: color-mix(in srgb, var(--muted) 20%, transparent);
}

.subject-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 48px; height: 48px;
  border-radius: 12px;
  color: var(--tone);
  background: color-mix(in srgb, var(--tone) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--tone) 18%, transparent);
  margin-bottom: 1.05rem;
  transition: transform .3s var(--ease), background .3s;
}
.subject-icon svg { width: 26px; height: 26px; }
.subject-card:hover .subject-icon {
  transform: translateY(-2px) scale(1.06) rotate(-4deg);
  background: color-mix(in srgb, var(--tone) 17%, transparent);
}

.subject-card h3 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: 1.28rem; font-weight: 700;
  margin-bottom: .45rem;
}
.subject-card > p {
  flex: 1;
  font-size: .89rem; line-height: 1.72; color: var(--muted);
}

.subject-foot {
  display: flex; align-items: center; justify-content: space-between;
  gap: .75rem;
  margin-top: 1.35rem; padding-top: 1rem;
  border-top: 1px dashed color-mix(in srgb, var(--fg) 12%, transparent);
  font-size: .77rem;
}
.subject-count { color: var(--muted); }
.subject-go {
  color: var(--tone); font-weight: 700;
  transition: transform .25s var(--ease);
}
.subject-card:hover .subject-go { transform: translateX(3px); }

/* ============ 特色卡片 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
  gap: 1.05rem;
}
.feature-card {
  position: relative;
  padding: 1.55rem 1.45rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: var(--card-shadow);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--primary) 30%, transparent);
  box-shadow: 0 2px 4px rgba(44, 31, 18, .05),
              0 22px 44px -26px rgba(44, 31, 18, .5);
}
.feature-no {
  position: absolute; top: 1.2rem; right: 1.3rem;
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: 1.45rem; font-weight: 700; line-height: 1;
  color: color-mix(in srgb, var(--fg) 15%, transparent);
}
.feature-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 17%, transparent);
  margin-bottom: .85rem;
}
.feature-icon svg { width: 20px; height: 20px; }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .4rem; }
.feature-card p { font-size: .86rem; line-height: 1.72; color: var(--muted); }

/* ============ 精选解读 ============ */
.featured-card {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: clamp(1.7rem, 4vw, 2.6rem);
  border-radius: 20px;
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: 0 2px 5px rgba(44, 31, 18, .05),
              0 36px 70px -48px rgba(44, 31, 18, .6);
  overflow: hidden;
}
.featured-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(to right, #C73E2A 0%, #C89F3D 50%, #1E6B6E 100%);
}
@media (min-width: 900px) {
  .featured-card { grid-template-columns: 1.15fr .85fr; align-items: center; }
}

.featured-tags { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .95rem; }
.tag {
  font-size: .68rem; font-weight: 600; letter-spacing: .04em;
  padding: .25rem .6rem;
  border-radius: 999px;
  color: var(--muted);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 60%, transparent);
}
.tag-primary {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 30%, transparent);
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.featured-body h3 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: clamp(1.32rem, 2.6vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -.015em;
  margin-bottom: .65rem;
}
.featured-body > p {
  font-size: .93rem; line-height: 1.82;
  color: var(--muted);
  margin-bottom: 1.15rem;
}
.featured-points {
  list-style: none;
  display: grid; gap: .48rem;
  margin-bottom: 1.55rem;
}
.featured-points li {
  position: relative;
  padding-left: 1.3rem;
  font-size: .87rem; line-height: 1.62; color: var(--fg);
}
.featured-points li::before {
  content: '';
  position: absolute; left: 0; top: .53em;
  width: 7px; height: 7px; border-radius: 50%;
  background: linear-gradient(135deg, #C73E2A, #C89F3D);
}

.featured-visual {
  display: flex; align-items: center; justify-content: center;
  padding: 1.4rem 1.2rem;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background:
    radial-gradient(circle at 30% 25%, rgba(199, 62, 42, .08), transparent 55%),
    radial-gradient(circle at 70% 78%, rgba(30, 107, 110, .08), transparent 55%),
    color-mix(in srgb, var(--surface-2) 48%, var(--bg));
  box-shadow: inset 0 1px 3px rgba(44, 31, 18, .07);
}
.rxn { width: 100%; max-width: 350px; height: auto; }

/* SVG 内的小动画 */
.rxn-left  { animation: rxnFloat 3.2s ease-in-out infinite; }
.rxn-mid   { animation: rxnFloat 3.2s ease-in-out -1.1s infinite; }
.rxn-right {
  transform-box: fill-box; transform-origin: center;
  animation: rxnPop 3.2s ease-in-out -2.2s infinite;
}
.rxn-arrow { animation: arrowPulse 2.4s ease-in-out infinite; }
.rxn-ph rect { animation: phGlow 4.5s ease-in-out infinite; }

@keyframes rxnFloat {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes rxnPop {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.1); }
}
@keyframes arrowPulse {
  0%, 100% { opacity: .42; }
  50%      { opacity: 1; }
}
@keyframes phGlow {
  0%, 100% { opacity: .85; }
  50%      { opacity: 1; }
}

/* ============ 收尾 CTA ============ */
.cta-band {
  position: relative;
  padding: clamp(3.25rem, 7vw, 5rem) 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  background:
    radial-gradient(circle at 15% 20%, rgba(199, 62, 42, .08), transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(30, 107, 110, .08), transparent 45%),
    color-mix(in srgb, var(--surface-2) 52%, var(--bg));
}
.cta-inner { max-width: 620px; margin: 0 auto; }
.cta-inner h2 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: clamp(1.45rem, 3.4vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -.015em;
  margin-bottom: .65rem;
}
.cta-inner p {
  color: var(--muted); font-size: .93rem; line-height: 1.78;
  margin-bottom: 1.5rem;
}
.cta-inner .hero-btns { justify-content: center; }

/* ============ 已发布解读网格 ============ */
.read-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(288px, 1fr));
  gap: 1.1rem;
  margin-top: 1.15rem;
}
.read-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.5rem 1.45rem 1.35rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--tone) 6%, transparent), transparent 46%),
    var(--card);
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.read-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(to right, var(--tone), color-mix(in srgb, var(--tone) 20%, transparent));
  opacity: .55;
  transition: opacity .3s;
}
.read-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--tone) 36%, transparent);
  box-shadow: 0 2px 4px rgba(44, 31, 18, .05),
              0 26px 50px -26px color-mix(in srgb, var(--tone) 55%, rgba(44, 31, 18, .42));
}
.read-card:hover::before { opacity: 1; }

.read-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: .85rem; }
.tag-tone {
  color: var(--tone);
  border-color: color-mix(in srgb, var(--tone) 32%, transparent);
  background: color-mix(in srgb, var(--tone) 11%, transparent);
}
.tag-live {
  border-color: color-mix(in srgb, var(--fg) 20%, transparent);
  background: color-mix(in srgb, var(--surface-2) 70%, transparent);
}

.read-card h3 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: 1.12rem; font-weight: 700;
  line-height: 1.42; letter-spacing: -.01em;
  margin-bottom: .5rem;
}
.read-card > p {
  flex: 1;
  font-size: .875rem; line-height: 1.76; color: var(--muted);
}
.read-more {
  display: inline-flex; align-items: center; gap: .3rem;
  margin-top: 1.1rem;
  font-size: .82rem; font-weight: 700;
  color: var(--tone);
  transition: transform .25s var(--ease);
}
.read-card:hover .read-more { transform: translateX(3px); }

/* ============ 真实案例速览 ============ */
.case-teaser-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.05rem;
}
.case-teaser {
  position: relative;
  display: flex; flex-direction: column;
  padding: 1.4rem 1.35rem 1.3rem 1.6rem;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--card);
  box-shadow: var(--card-shadow);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.case-teaser::before {
  content: '';
  position: absolute; top: 0; bottom: 0; left: 0; width: 3px;
  background: linear-gradient(to bottom, var(--tone), color-mix(in srgb, var(--tone) 18%, transparent));
  opacity: .6;
  transition: opacity .3s;
}
.case-teaser:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--tone) 34%, transparent);
  box-shadow: 0 2px 4px rgba(44, 31, 18, .05),
              0 24px 46px -26px color-mix(in srgb, var(--tone) 52%, rgba(44, 31, 18, .42));
}
.case-teaser:hover::before { opacity: 1; }

.case-teaser-tag {
  align-self: flex-start;
  font-size: .65rem; font-weight: 700; letter-spacing: .06em;
  padding: .2rem .55rem;
  border-radius: 999px;
  color: var(--tone);
  background: color-mix(in srgb, var(--tone) 11%, transparent);
  border: 1px solid color-mix(in srgb, var(--tone) 26%, transparent);
  margin-bottom: .75rem;
}
.case-teaser h3 {
  font-family: 'Fraunces', 'Songti SC','Source Han Serif SC','SimSun', serif;
  font-size: .99rem; font-weight: 700;
  line-height: 1.5; letter-spacing: -.005em;
  margin-bottom: .5rem;
}
.case-teaser > p {
  flex: 1;
  font-size: .84rem; line-height: 1.72; color: var(--muted);
}
.case-teaser-src {
  margin-top: 1.05rem; padding-top: .85rem;
  border-top: 1px dashed color-mix(in srgb, var(--fg) 12%, transparent);
  font-size: .74rem; color: var(--muted);
}

.section-more {
  display: flex; justify-content: center;
  margin-top: clamp(1.5rem, 3vw, 2.1rem);
}