/* 兰亭序 · 首页专属样式
 * 古卷展览级视觉：克制、留白、书法气韵
 */

/* ============================================
   主视觉区
   ============================================ */

.landing-hero {
  text-align: center;
  margin-bottom: clamp(64px, 10vh, 120px);
  position: relative;
}

/* 背景大字 —— 淡墨水印效果 */
.landing-hero__chars {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: -20px;
  user-select: none;
  pointer-events: none;
}

.landing-hero__char {
  font-size: clamp(80px, 18vw, 160px);
  font-weight: 700;
  line-height: 1;
  opacity: 0;
  color: var(--text);
  filter: opacity(0.06);
  animation: charReveal 1.2s ease-out forwards;
  animation-delay: calc(var(--delay) * 0.15s + 0.3s);
}

@keyframes charReveal {
  from {
    opacity: 0;
    transform: translateY(20px);
    filter: opacity(0);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: opacity(0.06);
  }
}

[data-theme="light"] .landing-hero__char {
  filter: opacity(0.04);
}
[data-theme="light"] @keyframes charReveal {
  to { filter: opacity(0.04); }
}

.landing-hero__title {
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 700;
  letter-spacing: 0.2em;
  margin: 0 0 12px;
  line-height: 1.2;
  position: relative;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.6s forwards;
}

.landing-hero__subtitle {
  font-size: clamp(14px, 1.8vw, 17px);
  color: var(--text-secondary);
  margin: 0 0 32px;
  letter-spacing: 0.35em;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 0.8s forwards;
}

.landing-hero__rule {
  width: 48px;
  height: 1px;
  background: var(--accent);
  margin: 0 auto 32px;
  opacity: 0;
  animation: ruleExpand 1s ease-out 1s forwards;
}

@keyframes ruleExpand {
  from { opacity: 0; width: 0; }
  to { opacity: 0.6; width: 48px; }
}

.landing-hero__desc {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 2;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 20px;
  text-align: justify;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 1.1s forwards;
}

.landing-hero__tagline {
  font-size: clamp(13px, 1.4vw, 15px);
  color: var(--accent);
  letter-spacing: 0.15em;
  margin: 0;
  opacity: 0;
  animation: fadeUp 0.8s ease-out 1.3s forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   版本卡片（带预览图）
   ============================================ */

.versions {
  margin-bottom: clamp(64px, 10vh, 120px);
}

.versions__heading {
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 400;
  text-align: center;
  margin: 0 0 clamp(32px, 5vh, 56px);
  letter-spacing: 0.5em;
  color: var(--text-secondary);
}

.versions__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2.5vw, 24px);
}

.version-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
  opacity: 0;
  animation: cardIn 0.6s ease-out forwards;
}
.version-card:nth-child(1) { animation-delay: 1.4s; }
.version-card:nth-child(2) { animation-delay: 1.55s; }
.version-card:nth-child(3) { animation-delay: 1.7s; }
.version-card:nth-child(4) { animation-delay: 1.85s; }

@keyframes cardIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.version-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

.version-card__preview {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 16px 16px 8px;
  min-height: 100px;
}

.version-card__img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: transform 0.3s ease;
}

.version-card:hover .version-card__img {
  transform: scale(1.08);
}

/* 定武本是拓本（深色），给个特殊背景 */
.version-card--dingwu .version-card__preview {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 8px 8px 0 0;
}
[data-theme="light"] .version-card--dingwu .version-card__preview {
  background: rgba(0, 0, 0, 0.06);
}

.version-card__body {
  padding: 12px 20px 20px;
  flex: 1;
}

.version-card__name {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: 0.05em;
}

.version-card__attr {
  font-size: 13px;
  color: var(--accent);
  margin: 0 0 6px;
  letter-spacing: 0.03em;
}

.version-card__note {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ============================================
   CTA
   ============================================ */

.landing-cta {
  text-align: center;
  margin-bottom: clamp(64px, 10vh, 120px);
  opacity: 0;
  animation: fadeUp 0.8s ease-out 2s forwards;
}

.landing-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 48px;
  background: var(--accent);
  color: var(--bg);
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.15em;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.25s ease;
}

.landing-cta__btn:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(122, 158, 126, 0.25);
  text-decoration: none;
}

.landing-cta__arrow {
  font-size: 20px;
  transition: transform 0.25s ease;
}
.landing-cta__btn:hover .landing-cta__arrow {
  transform: translateX(4px);
}

.landing-cta__hint {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 16px 0 0;
  letter-spacing: 0.1em;
}

/* ============================================
   底部引文
   ============================================ */

.landing-footer {
  text-align: center;
  padding-bottom: clamp(48px, 8vh, 96px);
  opacity: 0;
  animation: fadeUp 0.8s ease-out 2.2s forwards;
}

.landing-footer__quote {
  margin: 0;
  padding: 0;
  border: none;
}

.landing-footer__quote p {
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 2.2;
  color: var(--text-secondary);
  opacity: 0.6;
  letter-spacing: 0.08em;
  max-width: 520px;
  margin: 0 auto;
}

/* ============================================
   响应式
   ============================================ */

@media (max-width: 600px) {
  .versions__grid {
    grid-template-columns: 1fr;
  }

  .version-card__preview {
    padding: 12px 12px 6px;
  }

  .version-card__img {
    width: 56px;
    height: 56px;
  }

  .landing-hero__chars {
    margin-bottom: -10px;
  }
}