/* ==========================================================================
   biz3_deep - 深青
   基于 jiazhangshuo.com biz3 风格 二次定制
   主色: #124440  hover: #0b302d
   ========================================================================== */

:root {
  /* 站群共享变量 */
  --ks-primary: #124440;
  --ks-primary-hover: color-mix(in srgb, #124440 85%, #000);
  --ks-accent: #124440;
  --ks-accent-hover: color-mix(in srgb, #124440 80%, #000);
  --ks-cyan: #0ea5e9;
  --ks-danger: #dc2626;
  --ks-success: #16a34a;

  /* 白底基色 */
  --ks-bg: #fefefe;
  --ks-bg-2: #fafaf8;
  --ks-bg-3: #f5f5f0;
  --ks-bg-soft: #f0f0eb;
  --ks-overlay: rgba(0, 0, 0, .03);

  --ks-border: #e5e5e0;
  --ks-border-strong: rgba(0, 0, 0, .16);

  --ks-text: #1a1a1a;
  --ks-text-2: #57534e;
  --ks-muted: #78716c;
  --ks-light: #a8a29e;
  --ks-faint: #d6d3d1;

  --ks-shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);
  --ks-shadow: 0 2px 20px rgba(0, 0, 0, .06);
  --ks-shadow-lg: 0 4px 16px rgba(0, 0, 0, .06);

  /* biz3 系列别名 */
  --bz-primary: var(--ks-primary);
  --bz-bg:      var(--ks-bg);
  --bz-bg-2:    var(--ks-bg-2);
  --bz-text:    var(--ks-text);
  --bz-muted:   var(--ks-muted);
}

/* ==========================================================================
   全局重置
   ========================================================================== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  background: var(--ks-bg); color: var(--ks-text);
  font-family: Georgia, "Times New Roman", "PingFang SC", "Microsoft YaHei", serif;
  font-size: 16px; line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--ks-primary); text-decoration: none; transition: .25s; }
a:hover { color: #0b302d; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4, h5, h6 { font-weight: 400; letter-spacing: -0.5px; line-height: 1.3; color: var(--ks-text); }
h1 { font-size: clamp(36px, 5vw, 56px); }
h2 { font-size: clamp(28px, 4vw, 40px); }
h3 { font-size: clamp(20px, 2.5vw, 28px); }
h4 { font-size: 17px; }

/* ==========================================================================
   容器
   ========================================================================== */
.bz-container { max-width: 960px; margin: 0 auto; padding: 0 32px; }

/* ==========================================================================
   顶部导航 (bz-topbar)
   ========================================================================== */
.bz-topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 0; border-bottom: 1px solid var(--ks-border);
  margin-bottom: 60px;
  font-family: Inter, "PingFang SC", sans-serif;
}
.bz-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700; color: var(--ks-text);
  font-family: Georgia, serif;
}
.bz-logo img { height: 30px; }
.bz-nav { display: flex; gap: 24px; }
.bz-nav a {
  color: var(--ks-muted); font-size: 14px; font-weight: 500;
  letter-spacing: 0.5px; text-transform: uppercase;
}
.bz-nav a:hover { color: var(--ks-primary); }
.bz-nav .bz-drop { position: relative; }
.bz-nav .bz-drop-menu {
  display: none; position: absolute; top: 100%; right: 0;
  background: #fff; border: 1px solid var(--ks-border);
  border-radius: 6px; min-width: 140px; padding: 6px 0;
  z-index: 10; box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.bz-nav .bz-drop:hover .bz-drop-menu { display: block; }
.bz-nav .bz-drop-menu a {
  display: block; padding: 8px 16px; font-size: 13px;
  text-transform: none; color: var(--ks-text-2);
}
.bz-menu-toggle { display: none; }

/* ==========================================================================
   Hero 区域 (bz-hero 居中)
   ========================================================================== */
.bz-hero { padding: 60px 0 80px; text-align: center; }
.bz-label {
  display: inline-block;
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 11px; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--ks-primary);
  margin-bottom: 20px;
}
.bz-hero h1 {
  font-size: 56px; font-weight: 400; line-height: 1.15;
  margin-bottom: 20px; letter-spacing: -1px;
  max-width: 700px; margin-left: auto; margin-right: auto;
}
.bz-hero h1 em { font-style: italic; color: var(--ks-primary); }
.bz-hero .bz-desc {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 17px; color: var(--ks-muted);
  max-width: 520px; margin: 0 auto 36px; line-height: 1.7;
}
.bz-hero .bz-btns {
  display: flex; gap: 14px; justify-content: center;
  font-family: Inter, "PingFang SC", sans-serif;
}
.bz-btn {
  display: inline-block; padding: 12px 32px;
  border-radius: 4px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: .3s; border: none;
  letter-spacing: 0.5px;
}
.bz-btn-dark { background: var(--ks-text); color: #fff; }
.bz-btn-dark:hover { background: var(--ks-primary); color: #fff; }
.bz-btn-light {
  background: transparent; color: var(--ks-text);
  border: 1px solid var(--ks-faint);
}
.bz-btn-light:hover { border-color: var(--ks-primary); color: var(--ks-primary); }

/* ==========================================================================
   板块通用 (bz-section)
   ========================================================================== */
.bz-section { padding: 100px 0; }
.bz-section.bg-light { background: var(--ks-bg-2); }
.bz-sec-label {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 11px; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--ks-primary);
  margin-bottom: 12px;
}
.bz-section h2 {
  font-size: 40px; font-weight: 400; margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.bz-section .bz-sub {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 16px; color: var(--ks-muted); max-width: 500px;
}

/* ==========================================================================
   Stats 数据统计 (bz-stats)
   ========================================================================== */
.bz-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 40px; margin-top: 50px; text-align: center;
}
.bz-stat .num {
  font-size: 48px; font-weight: 400; color: var(--ks-primary);
  line-height: 1;
}
.bz-stat .lbl {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 13px; color: var(--ks-light); margin-top: 6px;
}

/* ==========================================================================
   Asymmetric grid (bz-asym 左右分屏)
   ========================================================================== */
.bz-asym {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center; margin-top: 50px;
}
.bz-asym.reverse { direction: rtl; }
.bz-asym.reverse > * { direction: ltr; }
.bz-asym .az-img {
  border-radius: 4px; overflow: hidden;
  box-shadow: 0 2px 20px rgba(0,0,0,.06);
}
.bz-asym .az-img img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.bz-asym .az-text h3 {
  font-size: 28px; font-weight: 400; margin-bottom: 14px;
  line-height: 1.3;
}
.bz-asym .az-text p {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 15px; color: var(--ks-muted); line-height: 1.7;
}

/* ==========================================================================
   News masonry (bz-news-masonry 瀑布流)
   ========================================================================== */
.bz-news-masonry {
  columns: 3; column-gap: 20px; margin-top: 40px;
}
.bz-news-item {
  break-inside: avoid; margin-bottom: 20px;
  border: 1px solid var(--ks-border); border-radius: 4px;
  overflow: hidden; transition: .2s; background: #fff;
}
.bz-news-item:hover {
  box-shadow: var(--ks-shadow-lg); transform: translateY(-2px);
}
.bz-news-item .ni-img img { width: 100%; display: block; }
.bz-news-item .ni-text { padding: 18px 20px; }
.bz-news-item .ni-text h4 {
  font-size: 17px; font-weight: 400; margin-bottom: 6px;
  line-height: 1.4;
}
.bz-news-item .ni-text .ni-meta {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 12px; color: var(--ks-light);
}

/* ==========================================================================
   Partners row (bz-partner-row 滚动轨道)
   ========================================================================== */
.bz-partner-row { overflow: hidden; margin-top: 40px; }
.bz-partner-track {
  display: flex; gap: 40px;
  animation: bz-p 20s linear infinite; width: fit-content;
}
.bz-partner-track:hover { animation-play-state: paused; }
.bz-partner-item {
  flex-shrink: 0; display: flex; align-items: center;
  justify-content: center;
}
.bz-partner-item img {
  height: 60px; width: auto; opacity: 0.5;
  transition: .3s; filter: grayscale(1);
}
.bz-partner-item:hover img { opacity: 1; filter: none; }
@keyframes bz-p {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ==========================================================================
   FAQ (bz-faq 折叠)
   ========================================================================== */
.bz-faq { max-width: 700px; margin-top: 40px; }
.bz-faq-item {
  border-bottom: 1px solid var(--ks-border); padding: 20px 0;
}
.bz-faq-item .q {
  font-size: 17px; font-weight: 400; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
}
.bz-faq-item .q::after {
  content: '+'; font-size: 20px; color: var(--ks-primary);
}
.bz-faq-item.open .q::after { content: '−'; }
.bz-faq-item .a {
  max-height: 0; overflow: hidden; transition: .3s;
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 14px; color: var(--ks-muted);
}
.bz-faq-item.open .a {
  max-height: 240px; padding-top: 12px;
}

/* ==========================================================================
   Features (biz3-features 核心优势)
   ========================================================================== */
.biz3-features {
  text-align: center; padding: 60px 0;
}
.biz3-features h2 {
  font-size: 22px; font-weight: 800; margin: 30px 0 18px;
}
.biz3-features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.biz3-feature-card {
  text-align: center; padding: 26px 16px;
  background: #fff; border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.biz3-feature-card .icon {
  font-size: 32px; margin-bottom: 10px;
}
.biz3-feature-card h4 {
  font-size: 14px; font-weight: 700; margin-bottom: 4px;
}
.biz3-feature-card p {
  font-size: 12px; color: var(--ks-muted);
}

/* ==========================================================================
   Reviews (biz3-reviews 用户评价)
   ========================================================================== */
.biz3-reviews {
  text-align: center; padding: 60px 0;
}
.biz3-reviews h2 {
  font-size: 22px; font-weight: 800; margin: 30px 0 18px;
}
.biz3-reviews-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.biz3-review-card {
  background: #fff; border-radius: 12px; padding: 22px 18px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
  text-align: center; border-top: 3px solid var(--ks-primary);
}
.biz3-review-card .stars {
  color: #f59e0b; font-size: 13px; margin-bottom: 6px;
}
.biz3-review-card p {
  font-size: 13px; color: #666; line-height: 1.7;
}
.biz3-review-card .author {
  font-weight: 700; font-size: 12px; margin-top: 8px;
  color: var(--ks-primary);
}

/* ==========================================================================
   Footer (bz-footer)
   ========================================================================== */
.bz-footer {
  background: var(--ks-text); color: var(--ks-light);
  padding: 60px 0 30px;
  font-family: Inter, "PingFang SC", sans-serif; font-size: 14px;
}
.bz-footer a { color: var(--ks-light); }
.bz-footer a:hover { color: #fff; }
.bz-footer .bz-f-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr;
  gap: 40px; max-width: 960px; margin: 0 auto; padding: 0 32px;
}
.bz-footer .bz-f-bottom {
  text-align: center; padding-top: 30px; margin-top: 30px;
  border-top: 1px solid rgba(255,255,255,.08);
  max-width: 960px; margin-left: auto; margin-right: auto;
  padding-left: 32px; padding-right: 32px;
}

/* ==========================================================================
   文章页样式
   ========================================================================== */
.bz-detail { padding-top: 40px; }
.bz-row { display: flex; flex-wrap: wrap; gap: 30px; }
.bz-main { flex: 2; min-width: 0; }
.bz-side { flex: 1; min-width: 260px; }
.bz-card {
  border: 1px solid var(--ks-border); border-radius: 4px;
  margin-bottom: 20px; background: #fff;
}
.bz-card-hd {
  padding: 16px 20px; border-bottom: 1px solid var(--ks-border);
}
.bz-card-hd h2, .bz-card-hd h3 {
  font-size: 16px; font-weight: 400; margin: 0;
}
.bz-card-bd { padding: 20px; }
.bz-bread {
  padding: 12px 0;
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 12px; color: var(--ks-light);
}
.bz-bread a { color: var(--ks-muted); }
.bz-art-item {
  display: flex; gap: 16px; padding: 16px 0;
  border-bottom: 1px solid var(--ks-bg-soft);
}
.bz-art-item:last-child { border-bottom: none; }
.bz-art-item .art-t {
  width: 160px; height: 110px; border-radius: 2px;
  overflow: hidden; flex-shrink: 0; background: var(--ks-bg-3);
}
.bz-art-item .art-t img {
  width: 100%; height: 100%; object-fit: cover;
}
.bz-art-item .art-i h4 {
  font-size: 15px; font-weight: 400; margin-bottom: 4px;
}
.bz-art-item .art-i h4 a { color: var(--ks-text); }
.bz-art-item .art-i h4 a:hover { color: var(--ks-primary); }
.bz-art-item .art-i .art-d {
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 13px; color: var(--ks-light);
  overflow: hidden; text-overflow: ellipsis;
  display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.bz-art-item .art-i .art-m {
  font-size: 11px; color: var(--ks-faint);
}
.bz-list-i {
  padding: 8px 0; border-bottom: 1px solid var(--ks-bg-soft);
}
.bz-list-i a {
  color: var(--ks-text-2);
  font-family: Inter, "PingFang SC", sans-serif;
  font-size: 14px;
}
.bz-list-i .lt { font-size: 11px; color: var(--ks-faint); }
.bz-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.bz-tags a {
  font-family: Inter, "PingFang SC", sans-serif;
  padding: 4px 10px; background: var(--ks-bg-2);
  color: var(--ks-muted); border-radius: 3px; font-size: 12px;
}
.bz-tags a:hover { background: var(--ks-primary); color: #fff; }
.bz-pag {
  display: flex; justify-content: center; gap: 6px;
  padding: 24px 0;
}
.bz-pag a, .bz-pag span {
  font-family: Inter, "PingFang SC", sans-serif;
  padding: 8px 14px; border: 1px solid var(--ks-border);
  border-radius: 3px; font-size: 13px; color: var(--ks-muted);
}
.bz-pag a:hover {
  background: var(--ks-primary); color: #fff;
  border-color: var(--ks-primary);
}
.bz-pag .active span {
  background: var(--ks-text); color: #fff;
}
.bz-dbody {
  font-size: 17px; line-height: 1.9; color: #44403c;
}
.bz-dbody img { max-width: 100%; border-radius: 4px; }
.bz-dbody a { color: var(--ks-primary); }
.bz-meta {
  font-family: Inter, "PingFang SC", sans-serif;
  display: flex; gap: 16px; font-size: 12px;
  color: var(--ks-light); padding-bottom: 12px;
  border-bottom: 1px solid var(--ks-border); margin-bottom: 18px;
}
.bz-pn {
  display: flex; gap: 16px; padding: 16px 0;
  border-top: 1px solid var(--ks-border); margin-top: 24px;
}
.bz-pn .lbl { font-size: 11px; color: var(--ks-faint); }
.bz-pn a { color: var(--ks-text-2); }
.bz-404 { text-align: center; padding: 100px 20px; }
.bz-404 .code {
  font-size: 120px; font-weight: 400; color: var(--ks-border);
}
.bz-404 .msg { color: var(--ks-light); margin: 14px 0; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 768px) {
  .bz-hero h1 { font-size: 36px; }
  .bz-asym { grid-template-columns: 1fr; gap: 30px; }
  .bz-stats { grid-template-columns: 1fr 1fr; }
  .bz-news-masonry { columns: 2; }
  .biz3-features-grid, .biz3-reviews-grid { grid-template-columns: 1fr; }
  .bz-row { flex-direction: column; }
  .bz-topbar { flex-direction: column; gap: 16px; }
  .bz-nav { flex-wrap: wrap; justify-content: center; }
  .bz-footer .bz-f-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   动效
   ========================================================================== */
@keyframes bzFadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.bz-section, .bz-hero { animation: bzFadeUp 0.5s ease-out; }