/* ========================================
   首页专属样式
   ======================================== */

/* ========== Hero ========== */
.hero {
  position: relative;
  padding: 110px 0 90px;
  overflow: hidden;
  background: linear-gradient(180deg, #F0F7FF 0%, #FFFFFF 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
}

.hero-orb-1 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, #BBDEFB 0%, transparent 70%);
  top: -120px;
  right: -120px;
}

.hero-orb-2 {
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, #B3E5FC 0%, transparent 70%);
  bottom: -100px;
  left: -100px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(21, 101, 192, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 101, 192, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, black 0%, transparent 70%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(21, 101, 192, 0.08);
  border: 1px solid rgba(21, 101, 192, 0.15);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.20);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.20); }
  50% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -1px;
  margin-bottom: 24px;
  color: var(--text);
}

.hero-title-accent {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-glow) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 19px;
  color: var(--text-soft);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 20px 28px;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(21, 101, 192, 0.10);
  border-radius: var(--radius-lg);
  width: fit-content;
}

.hero-stat {
  text-align: left;
}

.hero-stat-num {
  font-size: 34px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.hero-stat-unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary-light);
  margin-left: 2px;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

.hero-stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* Hero 可视化 - 替换为大logo与小智卡片联动 */
.hero-visual {
  position: relative;
  height: 540px;
}

.hero-xiaozhi-wrap {
  position: relative;
  background: linear-gradient(160deg, #FFFFFF 0%, #F0F7FF 100%);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(21, 101, 192, 0.12);
  box-shadow: 0 28px 60px rgba(21, 101, 192, 0.18);
  padding: 36px 32px 32px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  overflow: hidden;
}

.hero-xiaozhi-wrap::before {
  content: "";
  position: absolute;
  top: -80px;
  left: -80px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(79, 195, 247, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-xiaozhi-wrap::after {
  content: "";
  position: absolute;
  bottom: -100px;
  right: -100px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(21, 101, 192, 0.10) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-xiaozhi-img {
  position: relative;
  z-index: 1;
  width: 320px;
  height: 320px;
  object-fit: contain;
  filter: drop-shadow(0 20px 40px rgba(21, 101, 192, 0.35));
  animation: floatY 4s ease-in-out infinite;
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-xiaozhi-tags {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.hero-xiaozhi-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: rgba(21, 101, 192, 0.10);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid rgba(21, 101, 192, 0.15);
}

/* 小智标签前的蓝色呼吸光点 */
.tag-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  box-shadow: 0 0 0 0 rgba(21, 101, 192, 0.55);
  animation: tagDotBreathe 1.8s ease-in-out infinite;
}

@keyframes tagDotBreathe {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(21, 101, 192, 0.55);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 6px rgba(21, 101, 192, 0);
    opacity: 0.75;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tag-dot { animation: none; }
}

/* ========== 合作单位 - logo + 名称 ========== */
.trust {
  padding: 56px 0;
  background: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trust-head {
  text-align: center;
  margin-bottom: 32px;
}

.trust-eyebrow {
  display: inline-block;
  padding: 6px 16px;
  background: var(--bg-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.trust-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
}

.trust-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 6px;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 18px;
  align-items: stretch;
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.25s ease;
  cursor: default;
  height: 110px;
}

.trust-item:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.trust-logo-img {
  max-width: 72px;
  max-height: 48px;
  width: auto;
  height: auto;
  object-fit: contain;
  flex-shrink: 0;
  filter: grayscale(20%);
  transition: filter 0.25s ease;
}

.trust-item:hover .trust-logo-img {
  filter: grayscale(0%);
}

.trust-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-soft);
  text-align: center;
  line-height: 1.3;
}

.trust-item:hover .trust-name {
  color: var(--primary);
}

/* ========== 核心价值 ========== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.value-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.3s ease;
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(21, 101, 192, 0.20);
}

.value-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.value-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.7;
}

/* ========== 小智特色介绍（首页新增模块） ========== */
.xiaozhi-section {
  padding: 90px 0;
  background: linear-gradient(160deg, #FFFFFF 0%, #F0F7FF 100%);
  position: relative;
  overflow: hidden;
}

.xiaozhi-section::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79, 195, 247, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.xiaozhi-section::after {
  content: "";
  position: absolute;
  bottom: -200px;
  left: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(41, 182, 246, 0.10) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.xiaozhi-card {
  position: relative;
  z-index: 1;
  background: #FFFFFF;
  border: 1px solid rgba(21, 101, 192, 0.12);
  box-shadow: 0 28px 60px rgba(21, 101, 192, 0.18);
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 48px;
  align-items: center;
}

.xiaozhi-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.xiaozhi-big-logo {
  width: 320px;
  height: 320px;
  object-fit: contain;
  filter: drop-shadow(0 12px 24px rgba(21, 101, 192, 0.30));
  animation: floatY 4s ease-in-out infinite;
}

.xiaozhi-title {
  font-size: 36px;
  font-weight: 800;
  color: #0a1f3d;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.xiaozhi-title .accent {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.xiaozhi-subtitle {
  font-size: 18px;
  color: rgba(15, 30, 50, 0.7);
  margin-top: 8px;
}

.xiaozhi-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.xiaozhi-tags-title {
  font-size: 16px;
  color: rgba(15, 30, 50, 0.55);
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.xiaozhi-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.xiaozhi-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: rgba(21, 101, 192, 0.08);
  border: 1px solid rgba(21, 101, 192, 0.15);
  color: var(--primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: 999px;
  transition: all 0.2s;
}

.xiaozhi-tag:hover {
  background: rgba(79, 195, 247, 0.20);
  border-color: rgba(79, 195, 247, 0.40);
  transform: translateY(-2px);
}

.xiaozhi-tag .tag-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
}

.xiaozhi-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: linear-gradient(135deg, #4FC3F7 0%, #29B6F6 100%);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  border-radius: 999px;
  box-shadow: 0 12px 28px rgba(79, 195, 247, 0.40);
  transition: all 0.25s ease;
  align-self: flex-start;
  margin-top: 12px;
}

.xiaozhi-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(79, 195, 247, 0.55);
}

/* ========== 智囊团 - 突出显示卡片（创始人 + 荣誉院长） ========== */
.brains-highlight-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.brain-card-highlight {
  background: linear-gradient(135deg, #FFFFFF 0%, #F8FAFF 100%);
  border: 1.5px solid rgba(21, 101, 192, 0.15);
  border-radius: var(--radius-lg);
  padding: 28px 26px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.brain-card-highlight:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(21, 101, 192, 0.18);
}

.brain-highlight-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.brain-avatar-xl {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  overflow: hidden;
}

.brain-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brain-highlight-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.brain-highlight-meta h4 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}

.brain-highlight-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: rgba(21, 101, 192, 0.10);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  width: fit-content;
  letter-spacing: 0.5px;
}

.brain-titles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.brain-title-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(21, 101, 192, 0.06);
  border: 1px solid rgba(21, 101, 192, 0.10);
  color: var(--text-soft);
  font-size: 12.5px;
  font-weight: 600;
  border-radius: 8px;
  line-height: 1.4;
}

.chip-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

.brain-highlight-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
}

/* ========== 智囊团 - 普通卡片 ========== */
.brains-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.brain-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  gap: 16px;
  transition: all 0.3s ease;
}

.brain-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.brain-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  flex-shrink: 0;
  overflow: hidden;
}

.brain-info h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 2px;
}

.brain-role {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.brain-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.brain-mini-titles {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 6px;
}

.brain-mini-titles span {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
  line-height: 1.5;
}

/* ========== 课程流程 ========== */
.courses-flow {
  display: flex;
  align-items: stretch;
  gap: 16px;
}

.course-tier {
  flex: 1;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  position: relative;
  transition: all 0.3s ease;
}

.tier-1 { border-top: 4px solid #4FC3F7; }
.tier-2 { border-top: 4px solid #FFA726; }
.tier-3 { border-top: 4px solid #AB47BC; }

.course-tier:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.tier-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  margin-bottom: 12px;
}

.course-tier h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.tier-sub {
  font-size: 14px;
  color: var(--text-soft);
  margin-bottom: 20px;
}

.course-tier ul {
  list-style: none;
  margin-bottom: 24px;
}

.course-tier li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--text-soft);
  margin-bottom: 10px;
  line-height: 1.5;
}

.course-tier li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  width: 16px;
  height: 16px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  font-size: 10px;
  font-weight: 700;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.tier-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  transition: gap 0.2s ease;
}

.tier-link:hover {
  gap: 8px;
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--text-muted);
  font-weight: 300;
}

/* ========== 工具概览 ========== */
.tools-overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
  gap: 16px;
}

.tool-overview-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: all 0.3s ease;
}

a.tool-overview-card {
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

a.tool-overview-card:hover {
  color: inherit;
}

.tool-overview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(21, 101, 192, 0.20);
}

.tool-overview-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  margin: 0 auto 16px;
  overflow: hidden;
}

.tool-overview-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.tool-overview-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.tool-overview-card p {
  font-size: 13px;
  color: var(--text-soft);
  line-height: 1.6;
}

/* ========== CTA ========== */
.cta {
  padding: 60px 0 100px;
}

.cta-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: "";
  position: absolute;
  top: -100px;
  right: -100px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.10) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-card::after {
  content: "";
  position: absolute;
  bottom: -80px;
  left: -80px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(79, 195, 247, 0.20) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-card h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-card p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========== 联系合作微信二维码弹窗 ========== */
.wechat-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  align-items: center;
  justify-content: center;
}

.wechat-modal.is-open {
  display: flex;
}

.wechat-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.wechat-modal-card {
  position: relative;
  background: #fff;
  border-radius: 20px;
  padding: 32px;
  max-width: 340px;
  width: 90%;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
  animation: wechatModalIn 0.25s ease;
}

@keyframes wechatModalIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.wechat-modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  background: none;
  border: none;
  font-size: 30px;
  color: var(--text-soft);
  cursor: pointer;
  line-height: 1;
  padding: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease, color 0.2s ease;
}

.wechat-modal-close:hover {
  background: rgba(15, 23, 42, 0.06);
  color: var(--text);
}

.wechat-modal-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text);
}

.wechat-modal-qr {
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}

.wechat-modal-qr img {
  display: block;
  width: 100%;
  height: auto;
}

.wechat-modal-card p {
  font-size: 13px;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.6;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .xiaozhi-card { grid-template-columns: 1fr; text-align: center; }
  .xiaozhi-btn { align-self: center; }
  .trust-grid { grid-template-columns: repeat(5, 1fr); }
  .brains-highlight-grid { grid-template-columns: 1fr; }
}

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-title { font-size: 40px; }
  .hero-visual { height: 480px; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .brains-grid { grid-template-columns: 1fr; }
  .courses-flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .tools-overview-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { gap: 16px; padding: 16px 20px; }
  .hero-stat-num { font-size: 26px; }
  .cta-card { padding: 40px 24px; }
  .cta-card h2 { font-size: 26px; }
  .xiaozhi-big-logo { width: 220px; height: 220px; }
  .xiaozhi-title { font-size: 28px; }
}

@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .hero-title { font-size: 30px; }
  .hero-sub { font-size: 16px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; }
  .hero-stats { flex-wrap: wrap; gap: 12px; }
  .hero-stat-divider { display: none; }
  .hero-visual { height: 460px; }
  .hero-xiaozhi-img { width: 240px; height: 240px; }
  .trust-grid { grid-template-columns: repeat(3, 1fr); }
  .values-grid { grid-template-columns: 1fr; }
  .tools-overview-grid { grid-template-columns: 1fr; }
  .xiaozhi-card { padding: 32px 24px; grid-template-columns: 1fr; }
  .xiaozhi-big-logo { width: 200px; height: 200px; }
  .xiaozhi-title { font-size: 22px; }
  .brain-card-highlight { padding: 20px 18px; }
  .brain-highlight-meta h4 { font-size: 18px; }
}