/* =========================================================
   CSS Development Lab 07
   Text Overflow + Long Content
   ========================================================= */

:root {
  --page-max: 1200px;
  --text: #171717;
  --muted: #686868;
  --line: #e6e6e0;
  --surface: #ffffff;
  --soft: #f5f5f1;
  --radius: 20px;
}

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

body {
  margin: 0;
  color: var(--text);
  background: var(--surface);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

.page-wrap {
  width: min(calc(100% - 40px), var(--page-max));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 14px;
  color: #858585;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.intro {
  padding: clamp(72px, 10vw, 130px) 0 clamp(58px, 8vw, 90px);
  background:
    radial-gradient(circle at 86% 14%, rgba(0, 0, 0, 0.05), transparent 27%),
    linear-gradient(180deg, #fafaf8 0%, #f3f3ef 100%);
}

.intro-inner {
  max-width: 980px;
}

.intro h1,
.section-head h2,
.comparison-copy h2,
.practical-head h2 {
  margin: 0;
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.intro h1 {
  font-size: clamp(2.8rem, 7vw, 6rem);
}

.intro-desc {
  max-width: 800px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.18rem);
}

.lab {
  padding: clamp(80px, 10vw, 130px) 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .78fr);
  align-items: end;
  gap: clamp(28px, 6vw, 80px);
}

.section-head h2,
.comparison-copy h2,
.practical-head h2 {
  font-size: clamp(2rem, 4.5vw, 4.5rem);
}

.section-head > p,
.comparison-copy > p {
  margin: 0;
  color: var(--muted);
}

/* ---------- Demo grid ---------- */

.demo-grid {
  margin-top: clamp(38px, 6vw, 60px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.demo-card {
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.num {
  color: #999;
  font-size: .78rem;
  font-weight: 800;
}

.demo-card h3 {
  margin: 14px 0 18px;
  font-size: 1.25rem;
}

.demo-box {
  min-width: 0;
  padding: 18px;
  border-radius: 14px;
  background: var(--soft);
}

.demo-box p {
  margin: 0;
}

.demo-card code {
  display: block;
  margin-top: 16px;
  color: #777;
  font-size: .82rem;
}

/* ---------- 1. Single-line ellipsis ---------- */

.single-ellipsis {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* ---------- 2. Multi-line clamp ---------- */

.line-clamp-2,
.line-clamp-3 {
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
}

.line-clamp-2 {
  -webkit-line-clamp: 2;
}

.line-clamp-3 {
  -webkit-line-clamp: 3;
}

/* ---------- 3. Safe breaking ---------- */

.break-safe {
  overflow-wrap: anywhere;
  word-break: normal;
}

/* 中文通常保留默认换行即可 */
.zh-paragraph {
  word-break: normal;
  overflow-wrap: break-word;
}

/* ---------- 4. Flex overflow ---------- */

.flex-row {
  min-width: 0;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  border-radius: 14px;
  background: var(--soft);
}

.icon-box {
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: #171717;
  font-weight: 800;
}

.flex-copy {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.flex-copy strong,
.flex-copy span {
  min-width: 0;
}

.flex-copy span {
  color: var(--muted);
  font-size: .88rem;
}

/* ---------- Comparison ---------- */

.comparison {
  padding: 0 0 clamp(90px, 11vw, 140px);
}

.comparison-grid {
  padding: clamp(30px, 6vw, 64px);
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(320px, 1.15fr);
  align-items: center;
  gap: clamp(36px, 7vw, 90px);
  border-radius: 28px;
  background: var(--soft);
}

.comparison-copy > p {
  margin-top: 22px;
}

.rules {
  display: grid;
  gap: 12px;
}

.rules > div {
  padding: 18px 20px;
  display: grid;
  gap: 4px;
  border-radius: 14px;
  background: #fff;
}

.rules strong {
  font-size: .95rem;
}

.rules span {
  color: var(--muted);
  font-size: .88rem;
}

/* ---------- Practical example ---------- */

.practical {
  padding: 0 0 clamp(90px, 12vw, 150px);
}

.practical-head {
  max-width: 760px;
}

.product-row {
  margin-top: 36px;
  min-width: 0;
  padding: 20px;
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
}

.product-thumb {
  aspect-ratio: 4 / 3;
  border-radius: 14px;
  background:
    linear-gradient(135deg, #d8d8d2 0 50%, #b7b7ae 50% 100%);
}

.product-info {
  min-width: 0;
}

.product-title {
  margin: 0;
  font-weight: 780;
  font-size: 1.18rem;
  line-height: 1.35;
}

.product-desc,
.product-url {
  margin: 12px 0 0;
}

.product-desc {
  color: var(--muted);
}

.product-url {
  color: #777;
  font-size: .86rem;
}

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

@media (max-width: 820px) {
  .section-head,
  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-wrap {
    width: calc(100% - 28px);
  }

  .comparison-grid {
    padding: 24px;
  }

  .product-row {
    grid-template-columns: 1fr;
  }

  .product-thumb {
    max-width: none;
  }
}

:focus-visible {
  outline: 2px solid #171717;
  outline-offset: 3px;
}