:root {
  --bg: #f6f4ef;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --ink: #171412;
  --ink-soft: #6d665d;
  --ink-faint: rgba(23, 20, 18, 0.42);
  --line: rgba(23, 20, 18, 0.08);
  --line-strong: rgba(23, 20, 18, 0.14);
  --accent: #8a5a33;
  --shadow: 0 18px 60px rgba(41, 33, 24, 0.08);
  --shadow-lift: 0 28px 80px rgba(41, 33, 24, 0.16);
  --max-width: 1380px;
  --radius-xl: 24px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --display: "Fraunces", "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", serif;
  --sans: "Plus Jakarta Sans", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 255, 255, 0.9), transparent 26%),
    radial-gradient(circle at 88% 14%, rgba(224, 234, 229, 0.62), transparent 28%),
    radial-gradient(circle at 50% 100%, rgba(238, 228, 214, 0.5), transparent 40%),
    linear-gradient(180deg, #fbfaf7 0%, #f4f1eb 100%);
}

img {
  display: block;
  max-width: 100%;
}

button,
a {
  font: inherit;
  color: inherit;
}

a {
  text-decoration: none;
}

button {
  border: 0;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid rgba(23, 20, 18, 0.18);
  outline-offset: 3px;
}

.page-shell {
  width: min(calc(100% - 28px), var(--max-width));
  margin: 0 auto;
  padding: 20px 0 56px;
}

.site-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 4px;
}

.brand {
  font-family: var(--display);
  font-size: 1.56rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  font-feature-settings: "ss01" 1;
}

.language-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  background: var(--surface-strong);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.language-pill:hover {
  border-color: var(--line-strong);
}

.language-pill-current {
  color: var(--ink);
  font-weight: 600;
}

.language-pill-separator {
  opacity: 0.34;
}

.language-pill-next {
  opacity: 0.72;
}

/* ---------- Hero ---------- */

.hero-shell {
  padding: clamp(48px, 7vw, 96px) 0 clamp(30px, 4vw, 52px);
}

.hero-eyebrow {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.hero-eyebrow-left {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}

.hero-eyebrow-rule {
  width: 42px;
  height: 1px;
  align-self: center;
  background: var(--ink-faint);
  opacity: 0.6;
}

/* 眉题刻意做到最弱：小号、大字距、低对比，只作为节奏起手 */
.hero-eyebrow-text {
  font-family: var(--sans);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.hero-line {
  margin: 0;
  max-width: 15em;
  font-family: var(--display);
  font-size: clamp(2.1rem, 4.6vw, 4rem);
  font-weight: 400;
  font-synthesis: none;
  letter-spacing: 0.005em;
  line-height: 1.22;
  text-wrap: balance;
}

.hero-count {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  margin: 0;
  color: var(--ink-faint);
}

.hero-count-value {
  font-family: var(--display);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.hero-count-label {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

/* ---------- Case wall ---------- */

.case-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(18px, 2.2vw, 30px) clamp(16px, 1.8vw, 24px);
  align-items: start;
}

.case-card {
  grid-column: span 6;
}

/* 4 张一组的编辑节奏：7/5、5/7 交替，右列下沉形成错行 */
.case-card:nth-child(4n + 1) {
  grid-column: span 7;
}

.case-card:nth-child(4n + 2) {
  grid-column: span 5;
}

.case-card:nth-child(4n + 3) {
  grid-column: span 5;
}

.case-card:nth-child(4n + 4) {
  grid-column: span 7;
}

.case-card:nth-child(even) {
  margin-top: clamp(20px, 3.4vw, 52px);
}

.case-card-hitarea {
  display: block;
  width: 100%;
  padding: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.case-cover-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: #ece7de;
  box-shadow: var(--shadow);
  transition: box-shadow 320ms ease, transform 320ms ease;
}

/* 封面几乎保留原始 1800×870 的宽屏构图：2:1 只损失约 3%，
   不再把整屏截图裁成竖图，页面首屏与版式信息都能看清 */
.case-cover {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  object-position: top center;
  image-rendering: auto;
  transition: transform 620ms cubic-bezier(0.22, 1, 0.36, 1);
}

.case-cover-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(23, 20, 18, 0.07);
  pointer-events: none;
}

.case-open {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-size: 0.82rem;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 260ms ease, transform 260ms ease;
  pointer-events: none;
  backdrop-filter: blur(6px);
}

.case-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 2px 0;
}

.case-index {
  flex-shrink: 0;
  font-family: var(--display);
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.case-meta-body {
  min-width: 0;
  flex: 1;
}

.case-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.28;
}

.case-meta-row {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 9px;
}

.case-tags {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-wrap: wrap;
}

.case-tag {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.prompt-chip {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  border: 1px dashed rgba(23, 20, 18, 0.18);
  background: rgba(255, 255, 255, 0.5);
  color: var(--ink);
  font-size: 0.68rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  opacity: 0.9;
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.prompt-chip:hover {
  opacity: 1;
  border-color: var(--line-strong);
}

.prompt-chip.is-copied {
  background: rgba(224, 234, 229, 0.9);
  border-color: rgba(79, 110, 94, 0.28);
}

.prompt-chip.is-failed {
  background: rgba(247, 228, 224, 0.92);
  border-color: rgba(152, 79, 63, 0.28);
}

.case-card:hover .case-cover,
.case-card:focus-within .case-cover {
  transform: scale(1.032);
}

.case-card:hover .case-cover-frame,
.case-card:focus-within .case-cover-frame {
  box-shadow: var(--shadow-lift);
}

.case-card:hover .case-open,
.case-card:focus-within .case-open {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Footer ---------- */

.site-legal {
  margin-top: 64px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

/* 页脚所有信息压在一行 */
.site-meta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 100%;
}

.site-meta-separator {
  color: rgba(23, 20, 18, 0.24);
  font-size: 0.72rem;
  line-height: 1;
  user-select: none;
}

.soft-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0;
  background: none;
  border: 0;
  color: rgba(23, 20, 18, 0.58);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.06em;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: rgba(23, 20, 18, 0.18);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: color 160ms ease, letter-spacing 180ms ease, text-decoration-color 160ms ease;
}

.soft-cta-link::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 999px;
  background: rgba(125, 145, 132, 0.62);
}

.soft-cta-link:hover,
.soft-cta-link:focus-visible {
  color: var(--ink);
  letter-spacing: 0.075em;
  text-decoration-color: rgba(23, 20, 18, 0.32);
}

/* ---------- 微信二维码悬浮 ---------- */

.wechat-contact {
  position: relative;
  display: inline-flex;
}

.wechat-pop {
  position: absolute;
  bottom: calc(100% + 14px);
  left: 50%;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 180px;
  padding: 10px 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  box-shadow: 0 18px 44px rgba(41, 33, 24, 0.16);
  transform: translate(-50%, 6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
}

/* 小三角 */
.wechat-pop::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  width: 9px;
  height: 9px;
  margin-left: -4.5px;
  margin-top: -4.5px;
  background: #fff;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  transform: rotate(45deg);
}

.wechat-contact.is-open .wechat-pop,
.wechat-contact:hover .wechat-pop,
.wechat-contact:focus-within .wechat-pop {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.wechat-pop-img {
  width: 160px;
  height: 160px;
  border-radius: 6px;
}

.wechat-pop-hint {
  color: var(--ink-soft);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  line-height: 1;
}

/* 触屏设备没有 hover，按一下直接展开 */
@media (hover: none) {
  .wechat-pop {
    width: 200px;
  }

  .wechat-pop-img {
    width: 180px;
    height: 180px;
  }
}

.site-legal-line {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.72rem;
  line-height: 1.5;
  opacity: 0.56;
}

.site-legal-line a {
  color: inherit;
  text-decoration: none;
}

/* 来源声明：与备案号同级，压在同一行 */
.site-credit {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.72rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  opacity: 0.5;
}

.site-credit a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(23, 20, 18, 0.16);
  text-underline-offset: 0.24em;
}

.site-credit a:hover {
  opacity: 1;
}

/* ---------- Responsive ---------- */

@media (max-width: 1040px) {
  .hero-shell {
    padding: 56px 0 34px;
  }

  .case-card,
  .case-card:nth-child(4n + 1),
  .case-card:nth-child(4n + 2),
  .case-card:nth-child(4n + 3),
  .case-card:nth-child(4n + 4) {
    grid-column: span 6;
  }

  .case-card:nth-child(even) {
    margin-top: 28px;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 20px), var(--max-width));
    padding: 16px 0 40px;
  }

  .site-topbar {
    gap: 12px;
  }

  .brand {
    font-size: 1.3rem;
  }

  .language-pill {
    min-height: 34px;
    padding: 0 11px;
  }

  .hero-shell {
    padding: 40px 0 26px;
  }

  .hero-eyebrow {
    margin-bottom: 18px;
  }

  .hero-line {
    font-size: clamp(1.85rem, 8vw, 2.5rem);
    line-height: 1.3;
  }

    .case-grid {
    gap: 20px 12px;
  }

  .case-card,
  .case-card:nth-child(4n + 1),
  .case-card:nth-child(4n + 2),
  .case-card:nth-child(4n + 3),
  .case-card:nth-child(4n + 4) {
    grid-column: span 12;
  }

  .case-card:nth-child(even) {
    margin-top: 0;
  }

  .case-cover {
    aspect-ratio: 4 / 3;
  }

  .case-title {
    font-size: 0.94rem;
  }

  .site-legal {
    margin-top: 44px;
  }

  .site-meta-row {
    gap: 8px;
  }
}

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

  .case-cover,
  .case-cover-frame,
  .case-open {
    transition: none;
  }

  .case-card:hover .case-cover,
  .case-card:focus-within .case-cover {
    transform: none;
  }
}