/* ==========================================================================
   首页专属样式（尧图建站知识平台）
   ========================================================================== */

/* ---------- 快速入口（首页 · 印鉴式宫格） ---------- */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.quick-tile {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 30px 26px;
  transition: all 0.4s ease;
  overflow: hidden;
  display: block;
}

.quick-tile::after {
  content: "";
  position: absolute;
  right: -18px;
  bottom: -18px;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: var(--red-mist);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.quick-tile:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--red-soft);
}

.quick-tile:hover::after {
  opacity: 1;
}

.quick-tile .q-ico {
  width: 52px;
  height: 52px;
  border-radius: var(--r-sm);
  background: var(--red-mist);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}

.quick-tile:hover .q-ico {
  background: linear-gradient(135deg, var(--vermilion), var(--vermilion-deep));
}

.quick-tile:hover .q-ico svg {
  stroke: #fff;
}

.quick-tile h4 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--ink);
  font-family: var(--font-kai);
  position: relative;
  z-index: 1;
}

.quick-tile p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

.quick-tile .q-arrow {
  margin-top: 14px;
  font-size: 12.5px;
  color: var(--vermilion);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  position: relative;
  z-index: 1;
  transition: gap 0.3s ease;
}

.quick-tile:hover .q-arrow {
  gap: 10px;
}

/* ---------- 知识频道导航条（首页 · 卷轴横排） ---------- */
.channel-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.channel-strip a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--r-pill);
  background: var(--white);
  border: 1px solid var(--line);
  font-size: 14px;
  color: var(--body);
  font-family: var(--font-kai);
  transition: all 0.3s ease;
}

.channel-strip a:hover {
  background: linear-gradient(135deg, var(--vermilion), var(--vermilion-deep));
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.channel-strip a .c-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--vermilion);
}

.channel-strip a:hover .c-dot {
  background: #fff;
}

/* ---------- 学习路径（首页 · 阶梯式） ---------- */
.path-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.path-track::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: repeating-linear-gradient(
    90deg,
    var(--red-soft) 0,
    var(--red-soft) 8px,
    transparent 8px,
    transparent 16px
  );
  z-index: 0;
}

.path-node {
  text-align: center;
  position: relative;
  z-index: 1;
  padding: 0 14px;
}

.path-node .pn-num {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--red-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-family: var(--font-kai);
  font-size: 26px;
  font-weight: 700;
  color: var(--vermilion-deep);
  transition: all 0.4s ease;
}

.path-node:hover .pn-num {
  background: linear-gradient(135deg, var(--vermilion), var(--vermilion-deep));
  color: #fff;
  border-color: var(--vermilion-deep);
  transform: scale(1.06);
}

.path-node h4 {
  font-size: 17px;
  margin-bottom: 8px;
  font-family: var(--font-kai);
}

.path-node p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.75;
}

/* ---------- 干 git 输出双栏（首页 · 图文卷） ---------- */
.feature-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.feature-split .fs-img {
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}

.feature-split .fs-img img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.feature-split .fs-img .fs-seal {
  position: absolute;
  left: 24px;
  bottom: 24px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-radius: var(--r-sm);
  padding: 12px 18px;
  font-family: var(--font-kai);
  color: var(--vermilion-deep);
  font-size: 14px;
  font-weight: 600;
}

.feature-split .fs-text h2 {
  font-size: 32px;
  margin-bottom: 18px;
  font-family: var(--font-kai);
  letter-spacing: 1px;
}

.feature-split .fs-text > p {
  color: var(--muted);
  margin-bottom: 26px;
  line-height: 1.95;
  font-size: 15.5px;
}

.fs-points {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.fs-points .fp-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.fs-points .fp-ico {
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  background: var(--red-mist);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.fs-points .fp-body h5 {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 4px;
  font-family: var(--font-kai);
}

.fs-points .fp-body p {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.7;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1100px) {
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .path-track { grid-template-columns: repeat(2, 1fr); gap: 36px 0; }
  .path-track::before { display: none; }
  .feature-split { grid-template-columns: 1fr; gap: 36px; }
  .feature-split .fs-img img { height: 320px; }
}

@media (max-width: 700px) {
  .quick-grid { grid-template-columns: 1fr; }
  .path-track { grid-template-columns: 1fr; gap: 30px; }
  .feature-split .fs-text h2 { font-size: 26px; }
}