/* ==========================================================================
   编程学习之家 (pgsr.cn) - 首页专属样式
   设计亮点：上层清晰下层虚化 · 短视频清新风 · 独一无二骨架
   ========================================================================== */

/* ==========================================================================
   Hero 全屏 Banner — 层叠清晰+虚化
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-h);
}
/* Hero 背景实图 + 渐变叠层 */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(251, 248, 241, 0.92) 0%, rgba(212, 236, 245, 0.85) 50%, rgba(220, 240, 227, 0.8) 100%);
}
/* 虚化装饰球 — 下层虚化衬托 */
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  z-index: 1;
  pointer-events: none;
}
.hero-blob.b1 { width: 420px; height: 420px; background: var(--blue-light); top: -100px; right: -80px; opacity: 0.6; }
.hero-blob.b2 { width: 360px; height: 360px; background: var(--green-light); bottom: -120px; left: -60px; opacity: 0.5; }

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
/* Hero 左侧文字 */
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--white);
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-deep);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.hero-tag .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green-deep);
  box-shadow: 0 0 0 4px rgba(127, 201, 154, 0.2);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(127, 201, 154, 0.2); }
  50% { box-shadow: 0 0 0 8px rgba(127, 201, 154, 0.1); }
}
.hero-inner h1 {
  font-size: 52px;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-inner h1 .grad {
  background: linear-gradient(135deg, var(--blue-deep), var(--green-deep));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 17px;
  color: var(--body);
  margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 36px; }
.hero-stats .h-stat strong {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--ink);
}
.hero-stats .h-stat span { font-size: 13px; color: var(--muted); }

/* Hero 右侧 — 短视频风格代码卡片 */
.hero-visual {
  position: relative;
}
/* 代码窗口卡片 */
.code-card {
  background: var(--ink);
  border-radius: var(--r-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
}
.code-card .code-bar {
  display: flex;
  gap: 7px;
  margin-bottom: 18px;
}
.code-card .code-bar span {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.code-card .code-bar .r { background: #FF6B6B; }
.code-card .code-bar .y { background: #FFD93D; }
.code-card .code-bar .g { background: #6BCB77; }
.code-card .code-body {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 13.5px;
  line-height: 1.9;
  color: #A0B4C8;
}
.code-card .code-body .k { color: var(--blue-light); }
.code-card .code-body .s { color: var(--green-light); }
.code-card .code-body .c { color: #5A7A8A; font-style: italic; }
.code-card .code-body .n { color: #FFD93D; }

/* 浮动小卡片装饰 */
.float-card {
  position: absolute;
  background: var(--white);
  border-radius: var(--r);
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 3;
}
.float-card.fc1 {
  top: -24px; right: -20px;
  animation: floatY 4s ease-in-out infinite;
}
.float-card.fc2 {
  bottom: -28px; left: -30px;
  animation: floatY 4s ease-in-out infinite 2s;
}
.float-card .fc-ico {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.float-card.fc1 .fc-ico { background: var(--blue-mist); color: var(--blue-deep); }
.float-card.fc2 .fc-ico { background: var(--green-mist); color: var(--green-ink); }
.float-card .fc-txt strong { display: block; font-size: 15px; color: var(--ink); }
.float-card .fc-txt span { font-size: 12px; color: var(--muted); }
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-scroll {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--muted);
}
.hero-scroll .mouse {
  width: 22px; height: 36px;
  border: 2px solid var(--muted);
  border-radius: 12px;
  position: relative;
}
.hero-scroll .mouse::after {
  content: "";
  position: absolute;
  top: 7px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 7px;
  background: var(--muted);
  border-radius: 2px;
  animation: scrollDot 1.8s infinite;
}
@keyframes scrollDot {
  0% { opacity: 0; transform: translate(-50%, 0); }
  40% { opacity: 1; }
  80% { opacity: 0; transform: translate(-50%, 10px); }
  100% { opacity: 0; }
}

/* ==========================================================================
   核心优势 — 翻转卡片风
   ========================================================================== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-card {
  background: var(--cream-card);
  border-radius: var(--r-lg);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all 0.4s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.adv-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--green));
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}
.adv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-mist);
}
.adv-card:hover::before { transform: scaleX(1); }
.adv-ico {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r);
  background: linear-gradient(135deg, var(--blue-mist), var(--green-mist));
  transition: transform 0.35s var(--ease);
}
.adv-card:hover .adv-ico { transform: scale(1.1) rotate(-5deg); }
.adv-no {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--faint);
  margin-bottom: 8px;
}
.adv-card h3 { font-size: 18px; margin-bottom: 10px; }
.adv-card p { font-size: 13.5px; color: var(--body); }

/* ==========================================================================
   学习路径 — 左图右文交替
   ========================================================================== */
.path-list { display: flex; flex-direction: column; gap: 56px; }
.path-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.path-row.flip .path-media { order: 2; }
.path-media {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.path-media img { width: 100%; height: 340px; object-fit: cover; transition: transform 0.6s var(--ease); }
.path-media:hover img { transform: scale(1.05); }
.path-media .path-badge {
  position: absolute;
  top: 16px; left: 16px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  color: var(--blue-deep);
}
.path-body .path-step {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--green-ink);
  margin-bottom: 12px;
}
.path-body h3 { font-size: 26px; margin-bottom: 14px; }
.path-body > p { font-size: 15px; color: var(--body); margin-bottom: 20px; }
.path-points { display: flex; flex-direction: column; gap: 12px; }
.path-points li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--body);
}
.path-points li svg { flex-shrink: 0; margin-top: 3px; color: var(--green-deep); }
.path-body .btn { margin-top: 24px; }

/* ==========================================================================
   知识分类 — 六宫格
   ========================================================================== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.cat-card {
  background: var(--cream-card);
  border-radius: var(--r-lg);
  padding: 28px;
  border: 1px solid var(--border);
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.cat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--green-mist);
}
.cat-card .cat-ico {
  width: 52px; height: 52px;
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.cat-card:nth-child(1) .cat-ico { background: var(--blue-mist); color: var(--blue-deep); }
.cat-card:nth-child(2) .cat-ico { background: var(--green-mist); color: var(--green-ink); }
.cat-card:nth-child(3) .cat-ico { background: #FFF0E6; color: #E8915A; }
.cat-card:nth-child(4) .cat-ico { background: #F0E6FF; color: #8B5CB8; }
.cat-card:nth-child(5) .cat-ico { background: #FFE6F0; color: #C85A8B; }
.cat-card:nth-child(6) .cat-ico { background: #E6F0FF; color: #5A8BC8; }
.cat-card h4 { font-size: 17px; margin-bottom: 8px; }
.cat-card p { font-size: 13.5px; color: var(--body); margin-bottom: 14px; }
.cat-card .cat-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-deep);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.25s var(--ease);
}
.cat-card:hover .cat-link { gap: 8px; }

/* ==========================================================================
   学习流程 — 步骤时间轴
   ========================================================================== */
.steps-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.steps-wrap::before {
  content: "";
  position: absolute;
  top: 32px; left: 12%; right: 12%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--blue) 0, var(--blue) 8px, transparent 8px, transparent 16px);
}
.step-box { text-align: center; position: relative; }
.step-circle {
  width: 64px; height: 64px;
  margin: 0 auto 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--blue);
  font-size: 20px;
  font-weight: 800;
  color: var(--blue-deep);
  position: relative;
  z-index: 1;
  transition: all 0.3s var(--ease);
}
.step-box:hover .step-circle {
  background: var(--blue-deep);
  color: var(--white);
  transform: scale(1.1);
}
.step-box h4 { font-size: 16px; margin-bottom: 8px; }
.step-box p { font-size: 13.5px; color: var(--muted); }

/* ==========================================================================
   首页新闻列表 — 横向卡片流
   ========================================================================== */
.news-list-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.news-item {
  display: flex;
  gap: 24px;
  background: var(--cream-card);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all 0.35s var(--ease);
}
.news-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateX(6px);
  border-color: var(--blue-mist);
}
.news-item .n-thumb {
  flex-shrink: 0;
  width: 240px;
  position: relative;
  overflow: hidden;
}
.news-item .n-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  min-height: 160px;
  transition: transform 0.5s var(--ease);
}
.news-item:hover .n-thumb img { transform: scale(1.08); }
.news-item .n-body { flex: 1; padding: 24px 28px 24px 0; }
.news-item .n-body h4 {
  font-size: 18px;
  margin-bottom: 8px;
  transition: color 0.25s var(--ease);
}
.news-item:hover .n-body h4 { color: var(--blue-deep); }
.news-item .n-excerpt {
  font-size: 14px;
  color: var(--body);
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-item .n-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}
.news-item .n-foot .date { color: var(--muted); display: flex; align-items: center; gap: 6px; }
.news-item .n-foot .read { color: var(--blue-deep); font-weight: 600; }

/* ==========================================================================
   CTA 行动号召横幅
   ========================================================================== */
.cta-band {
  background: linear-gradient(135deg, var(--blue-deep), var(--green-deep));
  border-radius: var(--r-xl);
  padding: 48px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  width: 300px; height: 300px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  top: -100px; right: -50px;
  filter: blur(40px);
}
.cta-band::after {
  content: "";
  position: absolute;
  width: 200px; height: 200px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  bottom: -80px; left: 10%;
  filter: blur(30px);
}
.cta-text { position: relative; z-index: 1; }
.cta-text h3 { font-size: 26px; color: var(--white); margin-bottom: 8px; }
.cta-text p { font-size: 15px; color: rgba(255, 255, 255, 0.85); }
.cta-actions { display: flex; gap: 14px; position: relative; z-index: 1; flex-shrink: 0; }
.cta-actions .btn-ghost {
  background: rgba(255, 255, 255, 0.15);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.3);
}
.cta-actions .btn-ghost:hover { background: rgba(255, 255, 255, 0.25); }
.cta-actions .btn-primary { background: var(--white); color: var(--blue-deep); }
.cta-actions .btn-primary:hover { background: var(--cream); }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 480px; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-wrap { grid-template-columns: repeat(2, 1fr); }
  .steps-wrap::before { display: none; }
}

@media (max-width: 768px) {
  .hero-inner h1 { font-size: 36px; }
  .hero-sub { font-size: 15px; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .hero-stats .h-stat strong { font-size: 26px; }
  .path-row { grid-template-columns: 1fr; gap: 24px; }
  .path-row.flip .path-media { order: 0; }
  .path-media img { height: 240px; }
  .news-item { flex-direction: column; }
  .news-item .n-thumb { width: 100%; }
  .news-item .n-thumb img { min-height: 180px; }
  .news-item .n-body { padding: 20px; }
  .cta-band { flex-direction: column; text-align: center; padding: 36px 24px; }
}

@media (max-width: 480px) {
  .hero-inner h1 { font-size: 30px; }
  .adv-grid { grid-template-columns: 1fr; }
  .cat-grid { grid-template-columns: 1fr; }
  .steps-wrap { grid-template-columns: 1fr; }
  .float-card { display: none; }
}