/* ============================================================
   INDEX PAGE — 首页专属样式
============================================================ */

/* ============================================================
   BANNER / CAROUSEL — 全屏沉浸式设计
============================================================ */
#banner {
  position: relative; overflow: hidden;
  width: 100vw; height: 100vh;
}
.banner-track {
  display: flex; width: 300%; height: 100%;
  transition: transform 1s cubic-bezier(0.77,0,0.18,1);
}
.banner-slide {
  width: 33.3333%; height: 100%;
  position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}

/* --- Slide 1: 深蓝宇宙感 --- */
.banner-slide:nth-child(1) {
  background: linear-gradient(160deg, var(--navy4) 0%, var(--navy) 40%, #1B5699 70%, var(--blue2) 100%);
}
/* --- Slide 2: 暗蓝科技感 --- */
.banner-slide:nth-child(2) {
  background: linear-gradient(140deg, #060E1A 0%, #0D2240 30%, var(--navy) 60%, #1C5FA0 100%);
}

/* 满屏网格背景 */
.banner-slide::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 80px 80px;
}

/* 浮动光晕 */
.banner-glow {
  position: absolute; border-radius: 50%;
  pointer-events: none; filter: blur(80px);
}
/* Slide 1 光晕 */
.banner-slide:nth-child(1) .g1 { width: 700px; height: 700px; top: -20%; left: -10%; background: rgba(41,169,225,0.15); }
.banner-slide:nth-child(1) .g2 { width: 500px; height: 500px; bottom: -15%; right: -5%; background: rgba(244,121,32,0.12); }
.banner-slide:nth-child(1) .g3 { width: 300px; height: 300px; top: 30%; right: 25%; background: rgba(41,169,225,0.08); }
/* Slide 2 光晕 */
.banner-slide:nth-child(2) .g1 { width: 600px; height: 600px; top: -10%; right: -10%; background: rgba(244,121,32,0.12); }
.banner-slide:nth-child(2) .g2 { width: 450px; height: 450px; bottom: -10%; left: -5%; background: rgba(41,169,225,0.1); }
.banner-slide:nth-child(2) .g3 { width: 250px; height: 250px; top: 40%; left: 30%; background: rgba(103,200,239,0.06); }

/* 浮动装饰圆环 */
.banner-ring {
  position: absolute; border-radius: 50%; pointer-events: none;
  border: 1px solid rgba(255,255,255,0.06);
}
.banner-slide:nth-child(1) .r1 { width: 400px; height: 400px; top: 10%; right: 8%; animation: floatSlow 12s ease-in-out infinite; }
.banner-slide:nth-child(1) .r2 { width: 200px; height: 200px; bottom: 15%; left: 12%; animation: floatSlow 10s ease-in-out infinite 2s; }
.banner-slide:nth-child(1) .r3 { width: 150px; height: 150px; top: 50%; right: 35%; border-color: rgba(244,121,32,0.1); animation: floatSlow 14s ease-in-out infinite 1s; }
.banner-slide:nth-child(2) .r1 { width: 350px; height: 350px; top: 15%; left: 10%; animation: floatSlow 11s ease-in-out infinite; }
.banner-slide:nth-child(2) .r2 { width: 250px; height: 250px; bottom: 20%; right: 12%; animation: floatSlow 13s ease-in-out infinite 3s; }
.banner-slide:nth-child(2) .r3 { width: 180px; height: 180px; top: 45%; left: 40%; border-color: rgba(244,121,32,0.08); animation: floatSlow 9s ease-in-out infinite 1.5s; }

/* --- Slide 3: AI 商学院 --- */
.banner-slide:nth-child(3) {
  background: linear-gradient(150deg, #071833 0%, var(--navy) 35%, #194A85 65%, var(--blue2) 100%);
}
/* Slide 3 光晕 */
.banner-slide:nth-child(3) .g1 { width: 650px; height: 650px; top: -15%; right: -8%; background: rgba(41,169,225,0.13); }
.banner-slide:nth-child(3) .g2 { width: 480px; height: 480px; bottom: -12%; left: -6%; background: rgba(244,121,32,0.1); }
.banner-slide:nth-child(3) .g3 { width: 280px; height: 280px; top: 35%; left: 40%; background: rgba(103,200,239,0.07); }
/* Slide 3 圆环 */
.banner-slide:nth-child(3) .r1 { width: 380px; height: 380px; top: 12%; left: 8%; animation: floatSlow 13s ease-in-out infinite 1s; }
.banner-slide:nth-child(3) .r2 { width: 220px; height: 220px; bottom: 18%; right: 14%; animation: floatSlow 10s ease-in-out infinite 2.5s; }
.banner-slide:nth-child(3) .r3 { width: 160px; height: 160px; top: 48%; right: 30%; border-color: rgba(244,121,32,0.08); animation: floatSlow 11s ease-in-out infinite 0.5s; }

/* 商学院特色卡片 */
.academy-card {
  text-align: center; padding: 24px 18px 20px;
}
.academy-card .s1-stat-icon {
  font-size: 28px; margin-bottom: 8px;
}
.academy-card .s1-stat-num {
  font-size: 20px; flex-direction: column; gap: 2px;
}
.academy-card .s1-stat-num .unit {
  font-size: 14px; font-weight: 500; color: var(--blue3);
  display: block; margin-top: 2px;
}
.academy-card .s1-stat-label {
  font-size: 12px; color: rgba(255,255,255,0.55); margin-top: 4px;
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(3deg); }
}

/* 粒子点 */
.banner-dots-grid {
  position: absolute; inset: 0; pointer-events: none; overflow: hidden;
}
.particle {
  position: absolute; width: 3px; height: 3px; border-radius: 50%;
  background: rgba(255,255,255,0.25); animation: particleFloat 8s ease-in-out infinite;
}
@keyframes particleFloat {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.25; }
  50% { transform: translateY(-30px) scale(1.5); opacity: 0.6; }
}

/* 底部橙色渐变线 */
.banner-slide::after {
  content: ''; position: absolute;
  left: 0; bottom: 0; height: 4px; width: 100%;
  background: linear-gradient(90deg, var(--orange), var(--blue), transparent);
}

/* ===== Image 型 Slide ===== */
.banner-slide-img {
  background-size: cover; background-position: center;
  background-repeat: no-repeat;
}
.banner-slide-img::before {
  display: none; /* 图片型不需要网格 */
}
.banner-img-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,30,64,0.75) 0%, rgba(10,30,64,0.45) 50%, rgba(10,30,64,0.7) 100%);
  display: flex; align-items: center; justify-content: flex-start;
  padding: 0 8%;
}
.banner-img-overlay .s1-left {
  max-width: 640px;
}
.banner-img-overlay .s1-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(41,169,225,0.18); border: 1px solid rgba(41,169,225,0.35);
  border-radius: 100px; padding: 6px 18px; color: var(--blue);
  font-size: 13px; font-weight: 600; letter-spacing: 0.05em;
  margin-bottom: 24px;
}
.banner-img-overlay .s1-tag i {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--blue); animation: pulse-tag 2s ease-in-out infinite;
}
@keyframes pulse-tag {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.banner-img-overlay .s1-title {
  font-size: clamp(42px, 6vw, 76px);
  font-weight: 900; color: #fff; line-height: 1.1;
  letter-spacing: -0.02em; margin-bottom: 14px;
}
.banner-img-overlay .s1-desc {
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 600; color: rgba(255,255,255,0.7);
  margin-bottom: 32px;
}
.banner-img-overlay .s1-btns {
  display: flex; gap: 14px; flex-wrap: wrap;
}
.banner-img-overlay .btn-hero {
  padding: 14px 36px; border-radius: 8px;
  font-size: 16px; font-weight: 700; transition: all 0.3s;
  text-decoration: none; display: inline-block;
}
.banner-img-overlay .btn-hero-primary {
  background: var(--blue); color: #fff;
  box-shadow: 0 4px 20px rgba(41,169,225,0.4);
}
.banner-img-overlay .btn-hero-primary:hover {
  background: #1E90C8; transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(41,169,225,0.5);
}
.banner-img-overlay .btn-hero-outline {
  background: transparent; color: rgba(255,255,255,0.85);
  border: 1.5px solid rgba(255,255,255,0.3);
}
.banner-img-overlay .btn-hero-outline:hover {
  background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.6);
}

/* 满屏居中内容区 */
.banner-content {
  position: relative; z-index: 2;
  width: 100%; max-width: 1400px;
  padding: 0 8%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 60px;
}

/* ===== Slide 1 内容 ===== */
.s1-left { flex: 1; max-width: 620px; }
.s1-right { flex: 0 0 auto; display: flex; flex-direction: column; align-items: center; gap: 20px; }

.s1-tag {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(244,121,32,0.15); border: 1px solid rgba(244,121,32,0.3);
  color: #FFB060; padding: 8px 22px; border-radius: 30px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.08em;
  margin-bottom: 32px;
}
.s1-tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); animation: blink 2s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

.s1-title {
  font-size: clamp(36px, 5.5vw, 72px);
  font-weight: 900; line-height: 1.12;
  color: #fff; letter-spacing: -0.02em;
  margin-bottom: 28px;
}
.s1-title .acc-blue { color: var(--blue3); }
.s1-title .acc-orange { color: var(--orange3); }

/* 单行标题变体（第三张banner专用） */
.s1-title-inline {
  font-size: clamp(26px, 3.8vw, 52px);
  line-height: 1.25;
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.s1-title-inline .title-sep {
  color: rgba(255,255,255,0.3); font-weight: 300; margin: 0 4px;
}
.s1-title-inline .title-dot {
  color: rgba(255,255,255,0.4); font-weight: 300; margin: 0 2px;
}

.s1-desc {
  font-size: clamp(15px, 1.6vw, 19px);
  color: rgba(255,255,255,0.6); line-height: 1.8; margin-bottom: 40px;
  max-width: 520px;
}

.s1-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-hero {
  padding: 15px 38px; border-radius: 34px;
  font-size: 16px; font-weight: 700; cursor: pointer; border: none;
  transition: all 0.3s; font-family: inherit;
}
.btn-hero-primary {
  background: var(--orange); color: #fff;
  box-shadow: 0 6px 28px rgba(244,121,32,0.45);
}
.btn-hero-primary:hover { background: var(--orange2); transform: translateY(-3px); box-shadow: 0 10px 36px rgba(244,121,32,0.55); }
.btn-hero-outline {
  background: rgba(255,255,255,0.08); color: #fff;
  border: 1.5px solid rgba(255,255,255,0.3);
}
.btn-hero-outline:hover { background: rgba(255,255,255,0.18); transform: translateY(-3px); }

/* 右侧装饰数据卡 */
.s1-stat-cards { display: flex; flex-direction: column; gap: 16px; }
.s1-stat-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(12px);
  border-radius: 16px; padding: 20px 28px;
  text-align: center; min-width: 180px;
  transition: all 0.3s;
}
.s1-stat-card:hover { background: rgba(255,255,255,0.12); transform: scale(1.03); }
.s1-stat-num { font-size: 36px; font-weight: 900; color: #fff; line-height: 1.1; }
.s1-stat-num .unit { font-size: 16px; font-weight: 600; color: var(--blue3); }
.s1-stat-label { font-size: 13px; color: rgba(255,255,255,0.55); margin-top: 6px; font-weight: 500; }

/* ===== Slide 2 内容 ===== */
.s2-content {
  width: 100%; max-width: 1200px;
  padding: 0 8%;
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
}

.s2-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(41,169,225,0.12); border: 1px solid rgba(41,169,225,0.25);
  color: var(--blue3); padding: 8px 24px; border-radius: 30px;
  font-size: 13px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; margin-bottom: 28px;
}

.s2-title {
  font-size: clamp(30px, 4.5vw, 60px);
  font-weight: 900; color: #fff; line-height: 1.15;
  margin-bottom: 20px; letter-spacing: -0.01em;
}
.s2-title em { font-style: normal; }
.s2-title .t-blue { color: var(--blue3); }
.s2-title .t-orange { color: var(--orange3); }

.s2-sub {
  font-size: clamp(15px, 1.6vw, 19px);
  color: rgba(255,255,255,0.55); line-height: 1.8;
  max-width: 600px; margin-bottom: 48px;
}

/* 业务矩阵五宫格 */
.s2-grid {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 20px; width: 100%; max-width: 1000px;
}
.s2-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border-radius: 18px; padding: 32px 20px 28px;
  text-align: center;
  transition: all 0.35s;
  position: relative; overflow: hidden;
}
.s2-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  transform: scaleX(0); transition: transform 0.4s;
}
.s2-card:nth-child(1)::before { background: linear-gradient(90deg, var(--blue), var(--blue3)); }
.s2-card:nth-child(2)::before { background: linear-gradient(90deg, var(--orange), var(--orange3)); }
.s2-card:nth-child(3)::before { background: linear-gradient(90deg, #6C63FF, #A78BFA); }
.s2-card:nth-child(4)::before { background: linear-gradient(90deg, #27AE60, #6FCF97); }
.s2-card:nth-child(5)::before { background: linear-gradient(90deg, #FF6B6B, #FFA07A); }

.s2-card:hover { background: rgba(255,255,255,0.12); transform: translateY(-8px); border-color: rgba(255,255,255,0.2); }
.s2-card:hover::before { transform: scaleX(1); }

.s2-card-icon { font-size: 40px; margin-bottom: 16px; }
.s2-card h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.s2-card p { font-size: 12px; color: rgba(255,255,255,0.5); line-height: 1.7; }

/* 导航箭头 */
.banner-arrow {
  position: absolute; top: 50%; z-index: 10;
  width: 50px; height: 50px; border-radius: 50%;
  background: rgba(255,255,255,0.1); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.2);
  color: white; font-size: 20px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.3s;
  transform: translateY(-50%); user-select: none;
}
.banner-arrow:hover { background: rgba(255,255,255,0.2); transform: translateY(-50%) scale(1.1); }
.banner-arrow.prev { left: 32px; }
.banner-arrow.next { right: 32px; }

/* 导航圆点 */
.banner-dots {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 12px; z-index: 10;
}
.banner-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer; transition: all 0.4s;
}
.banner-dot.active { width: 36px; border-radius: 5px; background: var(--orange); box-shadow: 0 0 16px rgba(244,121,32,0.5); }

/* ============================================================
   SECTION COMMON
============================================================ */
.section { padding: 100px 4%; }
.section-inner { max-width: 1240px; margin: 0 auto; }
.section-header { margin-bottom: 60px; text-align: center; }
.tag-label {
  display: inline-block;
  font-size: 12px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 5px 14px; border-radius: 20px; margin-bottom: 14px;
}
.tag-blue { background: rgba(41,169,225,0.12); color: var(--blue2); }
.tag-orange { background: rgba(244,121,32,0.12); color: var(--orange2); }
.tag-navy { background: rgba(26,58,107,0.10); color: var(--navy); }
.section-title {
  font-size: clamp(26px, 3.5vw, 44px);
  font-weight: 800; color: var(--navy); line-height: 1.25;
}
.section-title em { font-style: normal; color: var(--blue); }
.section-desc { font-size: 16px; color: var(--muted); line-height: 1.8; margin-top: 14px; max-width: 640px; display: inline-block; }

/* ============================================================
   WHY US (星智优势)
============================================================ */
#why { background: #F8FAFC; }
.why-container { display: flex; flex-direction: column; gap: 28px; }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.why-card {
  padding: 32px 30px 32px 36px;
  border-radius: 4px;
  background: #F1F5F9;
  border-left: 4px solid var(--blue);
  text-align: left;
  transition: all 0.35s;
}
.why-card:hover { background: #fff; box-shadow: 0 10px 40px rgba(26,58,107,0.10); transform: translateY(-4px); border-left-color: var(--orange); }

.why-card-header { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.why-card-icon {
  width: 48px; height: 48px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; flex-shrink: 0;
}
.wci-1 { background: rgba(41,169,225,0.12); }
.wci-2 { background: rgba(41,169,225,0.08); }
.wci-3 { background: rgba(41,169,225,0.14); }
.wci-4 { background: rgba(41,169,225,0.10); }
.wci-5 { background: rgba(244,121,32,0.10); }
.wci-6 { background: rgba(34,197,94,0.10); }

.why-card h3 { font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: 0.02em; }
.why-card p { font-size: 14px; color: var(--muted); line-height: 1.85; }

/* ============================================================
   CORE BUSINESS (核心业务)
============================================================ */
#business { background: #fff; }
.biz-tabs {
  display: flex; justify-content: center; gap: 0;
  margin-bottom: 48px; border-radius: 12px;
  background: #F1F5F9; padding: 6px; width: fit-content;
  margin-left: auto; margin-right: auto;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}
.biz-tab {
  padding: 14px 36px; font-size: 15px; font-weight: 600;
  border: none; border-radius: 8px; cursor: pointer;
  transition: all 0.35s cubic-bezier(.4,0,.2,1);
  color: var(--muted); background: transparent;
  position: relative; display: flex; align-items: center; gap: 8px;
  user-select: none; white-space: nowrap;
}
.biz-tab .tab-icon { font-size: 18px; }
.biz-tab:hover { color: var(--blue); }
.biz-tab.active { background: #fff; color: var(--blue); box-shadow: 0 4px 16px rgba(26,58,107,0.10); transform: translateY(-1px); }

/* Tab panels */
.biz-panel { display: none; animation: bizFadeIn 0.5s ease both; }
.biz-panel.active { display: block; }
@keyframes bizFadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ---- Panel A: 技术基石 ---- */
.biz-a-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.biz-a-col { background: linear-gradient(135deg, #F8FAFC 0%, #EEF4FA 100%); border-radius: 14px; padding: 40px 32px 34px; border-top: 4px solid var(--blue); position: relative; overflow: hidden; transition: all 0.35s; }
.biz-a-col:hover { box-shadow: 0 12px 48px rgba(41,169,225,0.12); transform: translateY(-4px); }
.biz-a-col::after { content: ''; position: absolute; top: -30px; right: -20px; width: 120px; height: 120px; border-radius: 50%; background: radial-gradient(circle, rgba(41,169,225,0.08), transparent 70%); }
.biz-a-title { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.biz-a-title-icon { width: 46px; height: 46px; border-radius: 11px; background: rgba(41,169,225,0.12); display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.biz-a-title h3 { font-size: 19px; font-weight: 700; color: var(--navy); letter-spacing: 0.01em; }
.biz-a-item { display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px dashed rgba(41,169,225,0.15); transition: all 0.25s; cursor: default; border-radius: 6px; padding-left: 8px; margin-left: -8px; padding-right: 8px; }
.biz-a-item:last-child { border-bottom: none; }
.biz-a-item:hover { background: rgba(255,255,255,0.7); padding-left: 16px; margin-left: -16px; padding-right: 16px; }
.biz-a-item-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
.biz-a-item-body h4 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 5px; }
.biz-a-item-body p { font-size: 13px; color: var(--muted); line-height: 1.75; }

/* ---- Panel B: 增长引擎 ---- */
.biz-b-layout { display: grid; grid-template-columns: 340px 1fr; gap: 44px; align-items: start; }
.biz-b-map { border-radius: 14px; overflow: hidden; background: linear-gradient(160deg, #EDE8E0, #DDD5C8); height: 380px; display: flex; align-items: flex-end; justify-content: center; position: relative; box-shadow: 0 8px 32px rgba(0,0,0,0.08); }
.biz-b-map-inner {
  width: 100%; height: 100%; position: relative;
  background:
    radial-gradient(circle at 35% 45%, rgba(41,169,225,0.15) 0%, transparent 50%),
    radial-gradient(circle at 65% 55%, rgba(244,121,32,0.10) 0%, transparent 50%),
    repeating-linear-gradient(transparent, transparent 28px, rgba(180,165,145,0.15) 29px),
    repeating-linear-gradient(90deg, transparent, transparent 28px, rgba(180,165,145,0.15) 29px);
}
.biz-b-map-label { position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%); font-size: 13px; color: rgba(80,60,40,0.5); letter-spacing: 4px; text-transform: uppercase; font-weight: 600; }
.biz-b-map-dots { position: absolute; inset: 0; }
.geo-dot { position: absolute; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); animation: geoPulse 2.5s ease-in-out infinite; }
.geo-dot:nth-child(2) { left: 30%; top: 40%; animation-delay: 0.8s; background: var(--orange); }
.geo-dot:nth-child(3) { left: 58%; top: 52%; animation-delay: 1.5s; }
.geo-dot:nth-child(4) { left: 42%; top: 65%; animation-delay: 2s; background: var(--orange); }
@keyframes geoPulse { 0%,100% { transform: scale(1); opacity: 0.7; } 50% { transform: scale(2); opacity: 0.2; } }
.biz-b-caption { margin-top: 14px; padding: 16px 18px; background: #F8FAFC; border-radius: 10px; border-left: 3px solid var(--blue); }
.biz-b-caption p { font-size: 13px; color: var(--muted); line-height: 1.75; }
.biz-b-intro { margin-bottom: 28px; }
.biz-b-intro h3 { font-size: 21px; font-weight: 700; color: var(--navy); margin-bottom: 14px; }
.biz-b-intro h3 span { color: var(--blue); }
.biz-b-intro p { font-size: 14px; color: var(--muted); line-height: 1.85; }
.biz-b-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.biz-b-card { background: #fff; border-radius: 12px; padding: 26px 22px; border: 1.5px solid #E2E8F0; border-top: 3px solid var(--blue); transition: all 0.35s; cursor: default; position: relative; overflow: hidden; }
.biz-b-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform 0.4s; }
.biz-b-card:nth-child(2)::before, .biz-b-card:nth-child(2) { border-top-color: var(--blue); }
.biz-b-card:nth-child(3)::before, .biz-b-card:nth-child(3) { border-top-color: var(--orange); }
.biz-b-card:hover { box-shadow: 0 10px 36px rgba(41,169,225,0.12); transform: translateY(-4px); border-color: rgba(41,169,225,0.3); }
.biz-b-card:hover::before { transform: scaleX(1); }
.biz-b-card-icon { font-size: 28px; margin-bottom: 14px; }
.biz-b-card h4 { font-size: 16px; font-weight: 700; color: var(--navy); margin-bottom: 9px; }
.biz-b-card p { font-size: 13px; color: var(--muted); line-height: 1.75; }

/* ---- Panel C: 生态服务 ---- */
.biz-c-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.biz-c-col { border-radius: 14px; padding: 38px 32px 34px; position: relative; overflow: hidden; }
.biz-c-col-1 { background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%); border-top: 4px solid var(--blue); }
.biz-c-col-2 { background: linear-gradient(135deg, #FFF7ED 0%, #FFEDD5 100%); border-top: 4px solid var(--orange); }
.biz-c-col:hover { box-shadow: 0 12px 48px rgba(0,0,0,0.08); transform: translateY(-4px); transition: all 0.35s; }
.biz-c-num { font-size: 28px; font-weight: 800; margin-bottom: 6px; }
.biz-c-col-1 .biz-c-num { color: var(--blue); }
.biz-c-col-2 .biz-c-num { color: var(--orange); }
.biz-c-col h3 { font-size: 19px; font-weight: 700; color: var(--navy); margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px dashed rgba(0,0,0,0.10); }
.biz-c-items { display: flex; flex-direction: column; gap: 0; }
.biz-c-item { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px dashed rgba(0,0,0,0.07); transition: all 0.25s; cursor: default; border-radius: 8px; padding-left: 8px; margin-left: -8px; }
.biz-c-item:last-child { border-bottom: none; }
.biz-c-item:hover { background: rgba(255,255,255,0.55); padding-left: 18px; margin-left: -18px; }
.biz-c-item-icon { font-size: 24px; flex-shrink: 0; margin-top: 1px; }
.biz-c-item-body h4 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 5px; }
.biz-c-item-body p { font-size: 13px; color: var(--muted); line-height: 1.72; }

/* ============================================================
   CASES (合作案例)
============================================================ */
#cases { background: #FAFBFD; }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  margin-top: 48px;
}
.case-card {
  background: #fff;
  border-radius: 16px;
  padding: 36px 24px 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  border: 1.5px solid #EEF2F7;
  transition: all 0.4s cubic-bezier(.4,0,.2,1);
  cursor: default;
  position: relative;
  overflow: hidden;
}
.case-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--orange));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(.4,0,.2,1);
}
.case-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(26,58,107,0.10);
  border-color: rgba(41,169,225,0.25);
}
.case-card:hover::before {
  transform: scaleX(1);
}
.case-logo {
  width: 72px; height: 72px;
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 800;
  color: #fff;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  flex-shrink: 0;
  position: relative;
}
.case-logo::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 21px;
  border: 2px dashed rgba(255,255,255,0.25);
}
.case-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.04em;
  text-align: center;
}
.case-tag {
  font-size: 11px;
  color: #94A3B8;
  background: #F1F5F9;
  padding: 4px 12px;
  border-radius: 20px;
  letter-spacing: 0.03em;
}

/* ============================================================
   INDEX PAGE RESPONSIVE
============================================================ */
@media (max-width: 1100px) {
  .s2-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 1024px) {
  .biz-a-grid, .biz-c-grid { grid-template-columns: 1fr !important; }
  .biz-b-layout { grid-template-columns: 1fr !important; gap: 28px; }
  .biz-b-map { height: 260px; }
  .biz-b-cards { grid-template-columns: repeat(3, 1fr) !important; }
  .cases-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
}
@media (max-width: 900px) {
  .banner-content { flex-direction: column; text-align: center; gap: 40px; }
  .s1-left { max-width: 100%; }
  .s1-desc { max-width: 100%; }
  .s1-btns { justify-content: center; }
  .s1-stat-cards { flex-direction: row; }
}
@media (max-width: 768px) {
  .why-grid { grid-template-columns: 1fr !important; }
  .s2-grid { grid-template-columns: repeat(2, 1fr); }
  .s1-stat-cards { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .s1-stat-card { min-width: 140px; }
  .form-row { grid-template-columns: 1fr; }
  .banner-arrow { width: 40px; height: 40px; font-size: 16px; }
  .banner-arrow.prev { left: 16px; }
  .banner-arrow.next { right: 16px; }
  .biz-tabs { flex-wrap: wrap; width: 100% !important; justify-content: stretch; }
  .biz-tab { flex: 1; text-align: center; justify-content: center; padding: 12px 16px; font-size: 13px; }
  .biz-b-cards { grid-template-columns: 1fr !important; }
  .biz-a-title h3 { font-size: 17px; }
  .biz-a-item-body h4, .biz-c-item-body h4 { font-size: 14px; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .case-card { padding: 28px 16px 24px; }
  .case-logo { width: 60px; height: 60px; font-size: 24px; border-radius: 14px; }
  .case-name { font-size: 14px; }
}
@media (max-width: 480px) {
  .section { padding: 64px 4%; }
  .why-grid { grid-template-columns: 1fr; }
  .s2-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
}