/* ============================================================
   首页焕新 · 水墨国风
   仅 index.html 加载，全部规则作用域锁定 body.home —— 不影响其它页面
   依赖 style.css 中的设计令牌（--seal-red / --surface / --ink-deep ...）
   ============================================================ */

/* ── 滚动揭示：仅在 JS 就绪(.reveal-ready)后才隐藏，无 JS 时内容照常显示 ── */
.home.reveal-ready .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s cubic-bezier(.2, .7, .2, 1),
              transform .9s cubic-bezier(.2, .7, .2, 1);
  will-change: opacity, transform;
}
.home.reveal-ready .reveal.in {
  opacity: 1;
  transform: none;
}
/* 卡片错峰入场 */
.home.reveal-ready .card-grid .reveal:nth-child(1) { transition-delay: .04s; }
.home.reveal-ready .card-grid .reveal:nth-child(2) { transition-delay: .12s; }
.home.reveal-ready .card-grid .reveal:nth-child(3) { transition-delay: .20s; }
.home.reveal-ready .card-grid .reveal:nth-child(4) { transition-delay: .28s; }
.home.reveal-ready .card-grid .reveal:nth-child(5) { transition-delay: .36s; }

/* ── Hero 画布质感 ── */
.home .hero { padding-bottom: 44px; }
.home #inkCanvas { opacity: .92; }

/* 下探指引 */
.home .scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: "KaiTi", "楷体", "STKaiti", serif;
  font-size: .68rem;
  letter-spacing: 4px;
  color: var(--ink-light);
  opacity: 0;
  animation: fadeUp 1s 1.4s ease forwards;
  pointer-events: none;
}
.home .scroll-hint span {
  display: block;
  position: relative;
  width: 1px;
  height: 30px;
  overflow: hidden;
  background: linear-gradient(var(--ink-wash), transparent);
}
.home .scroll-hint span::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 9px;
  background: var(--seal-red);
  animation: scrollDot 1.9s ease-in-out infinite;
}
@keyframes scrollDot {
  0%   { transform: translateY(-12px); opacity: 0; }
  40%  { opacity: 1; }
  100% { transform: translateY(30px); opacity: 0; }
}

/* ── 章节眉标（小写英文 kicker） ── */
.home .section-eyebrow {
  display: block;
  font-family: "KaiTi", "楷体", "STKaiti", serif;
  font-size: .72rem;
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--seal-red);
  opacity: .75;
  margin-bottom: 8px;
}

/* ── 墨色分隔 ── */
.home .ink-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 36px 24px 4px;
}
.home .ink-divider::before,
.home .ink-divider::after {
  content: '';
  flex: 1;
  max-width: 130px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--ink-wash));
}
.home .ink-divider::after {
  background: linear-gradient(to left, transparent, var(--ink-wash));
}
.home .ink-divider i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--seal-red);
  opacity: .75;
  box-shadow: 0 0 0 4px rgba(192, 64, 64, .1);
}

/* ── 探索领域 · 卡片 ── */
.home .card-grid { gap: 22px; }

.home .card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 30px 26px 26px;
  overflow: hidden;
  color: var(--ink-deep);
  transition: transform .45s cubic-bezier(.2, .7, .2, 1),
              box-shadow .45s, border-color .45s;
}
/* 左侧朱砂笔锋 */
.home .card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--seal-red);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
}
/* 右下墨晕扩散 */
.home .card::after {
  content: '';
  position: absolute;
  right: -50px;
  bottom: -50px;
  width: 140px;
  height: 140px;
  background: radial-gradient(circle, rgba(192, 64, 64, .09), transparent 70%);
  opacity: 0;
  transition: opacity .5s;
  pointer-events: none;
}
.home .card:hover {
  transform: translateY(-6px);
  border-color: var(--ink-wash);
  box-shadow: 0 20px 42px -20px rgba(26, 26, 26, .3);
}
.home .card:hover::before { transform: scaleY(1); }
.home .card:hover::after { opacity: 1; }

.home .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  margin-bottom: 18px;
  color: var(--seal-red);
  background: var(--accent-bg);
  border: 1px solid rgba(192, 64, 64, .16);
  border-radius: 14px;
  transition: transform .5s cubic-bezier(.2, .7, .2, 1), background .5s;
}
.home .card-icon svg { width: 30px; height: 30px; }
.home .card:hover .card-icon {
  transform: translateY(-2px) rotate(-5deg);
  background: rgba(192, 64, 64, .12);
}

.home .card h3 {
  font-family: "KaiTi", "楷体", "STKaiti", serif;
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 2px;
  color: var(--ink-deep);
  margin-bottom: 8px;
}
.home .card p {
  font-size: .9rem;
  line-height: 1.85;
  color: var(--ink-mid);
  margin: 0;
}
.home .card .card-go {
  margin-top: auto;
  padding-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: "KaiTi", "楷体", "STKaiti", serif;
  font-size: .8rem;
  letter-spacing: 2px;
  color: var(--seal-red);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity .4s, transform .4s;
}
.home .card:hover .card-go {
  opacity: 1;
  transform: none;
}

/* ── 关于本站 · 水墨信笺 ── */
.home .about-box {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--seal-red);
  border-radius: 4px;
  padding: 32px 38px;
  max-width: 780px;
  box-shadow: 0 12px 30px -22px rgba(26, 26, 26, .25);
}
.home .about-box p {
  font-size: .96rem;
  line-height: 2;
  color: var(--ink-mid);
  margin: 0 0 14px;
  letter-spacing: .5px;
}
.home .about-box p:last-child { margin-bottom: 0; }
/* 角落朱印 */
.home .about-box::after {
  content: '轩';
  position: absolute;
  right: 30px;
  bottom: 26px;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "KaiTi", "楷体", "STKaiti", serif;
  font-size: 1.6rem;
  color: var(--seal-red);
  border: 2px solid var(--seal-red);
  border-radius: 5px;
  transform: rotate(-3deg);
  opacity: .5;
  pointer-events: none;
}

/* ── 强化首页主按钮 ── */
.home .hero-actions .btn-primary {
  box-shadow: 0 8px 22px -10px rgba(192, 64, 64, .5);
}

/* ── 移动端适配 ── */
@media (max-width: 768px) {
  .home .scroll-hint { display: none; }
  .home .ink-divider { padding: 24px 16px 0; }
  .home .card { padding: 24px 20px 22px; }
  .home .about-box { padding: 26px 22px; }
  .home .about-box::after {
    right: 18px;
    bottom: 18px;
    width: 42px;
    height: 42px;
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .home .about-box::after { display: none; }
}

/* ── 降级：尊重「减少动态效果」偏好 ── */
@media (prefers-reduced-motion: reduce) {
  .home .scroll-hint span::after { animation: none; }
  .home.reveal-ready .reveal {
    transition-duration: .01ms;
    transform: none;
  }
}