/* ============================================================
 * 产品价值介绍页 — 克制有设计感
 * ============================================================ */

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #fff;
  color: #1f2937;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
a { text-decoration: none; }

html { scroll-behavior: smooth; }

/* ============ 容器 ============ */
.ab-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 768px) {
  .ab-container { padding: 0 20px; }
}

/* ============ 顶部导航（极简弱化版） ============ */
.ab-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 32px;
  background: rgba(255,255,255,.78);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid rgba(15,23,42,.04);
}
.ab-nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #0f172a;
  line-height: 1.15;
}
.ab-logo-box {
  width: 40px; height: 40px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand, #3155d4), #7a93f0);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px -6px rgba(49,85,212,.45);
}
.ab-logo-box svg { width: 22px; height: 22px; }
.ab-brand-block {
  display: inline-flex;
  flex-direction: column;
  gap: 1px;
}
.ab-brand-main {
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: .5px;
}
.ab-brand-sub {
  font-size: 11.5px;
  font-weight: 500;
  color: #64748b;
  letter-spacing: .4px;
}
.ab-logo {
  width: 28px; height: 28px;
  color: var(--brand, #3155d4);
  display: inline-flex;
}
.ab-logo svg { width: 100%; height: 100%; }
.ab-logo-sm { width: 22px; height: 22px; }
.ab-nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
}
.ab-nav-lite {
  color: #475569;
  font-size: 14px;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: 8px;
  transition: all .15s ease;
}
.ab-nav-lite:hover {
  color: var(--brand, #3155d4);
  background: rgba(49,85,212,.06);
}
.ab-nav-cta {
  padding: 7px 16px;
  background: var(--brand, #3155d4);
  color: #fff !important;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  transition: all .2s ease;
}
.ab-nav-cta:hover {
  background: var(--brand-hover, #2647b8);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(49,85,212,.25);
}
@media (max-width: 768px) {
  .ab-nav { padding: 8px 16px; }
  .ab-logo-box { width: 34px; height: 34px; border-radius: 9px; }
  .ab-logo-box svg { width: 18px; height: 18px; }
  .ab-brand-main { font-size: 16px; }
  .ab-brand-sub { font-size: 10.5px; }
  .ab-nav-links { gap: 4px; }
  .ab-nav-lite { padding: 6px 8px; font-size: 13px; }
  .ab-nav-cta { padding: 6px 12px; font-size: 13px; }
}

/* ============ Hero ============ */
.ab-hero {
  padding: 80px 32px 72px;
  background: #fafbff;
  position: relative;
  overflow: hidden;
}
.ab-hero-deco {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(60px);
  opacity: .5;
}
.ab-hero-deco-1 {
  top: -180px; right: -120px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(49,85,212,.22), transparent 70%);
}
.ab-hero-deco-2 {
  bottom: -200px; left: -150px;
  width: 450px; height: 450px;
  background: radial-gradient(circle, rgba(245,158,11,.15), transparent 70%);
}
.ab-hero-inner {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.ab-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: #fff;
  color: var(--brand, #3155d4);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: .5px;
  border: 1px solid var(--brand-soft-2, #e0e7fa);
  box-shadow: 0 2px 8px rgba(49,85,212,.06);
}
.ab-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brand, #3155d4);
  box-shadow: 0 0 0 3px rgba(49,85,212,.2);
  animation: ab-pulse 1.8s ease-in-out infinite;
}
@keyframes ab-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(49,85,212,.2); }
  50% { box-shadow: 0 0 0 6px rgba(49,85,212,.08); }
}

.ab-hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  color: #0f172a;
  margin: 0 0 20px;
}
.ab-hl-brand {
  background: linear-gradient(120deg, var(--brand, #3155d4) 0%, #7a93f0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  display: inline-block;
}
.ab-hl-brand::after {
  content: '';
  position: absolute;
  bottom: 6px; left: 2%;
  width: 96%; height: 10px;
  background: linear-gradient(120deg, rgba(49,85,212,.18), rgba(122,147,240,.08));
  z-index: -1;
  border-radius: 4px;
}

.ab-hero-sub-small {
  font-size: 14px;
  font-weight: 500;
  color: #64748b;
  margin: 0 0 18px;
  letter-spacing: .3px;
}
.ab-hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: #475569;
  margin: 0 0 32px;
}
.ab-hero-sub strong { color: #0f172a; font-weight: 700; }
.ab-hl-accent {
  color: var(--brand, #3155d4);
  font-weight: 800 !important;
  background: linear-gradient(180deg, transparent 62%, rgba(49,85,212,.16) 62%);
  padding: 0 3px;
  border-radius: 3px;
}

.ab-hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.ab-btn-primary,
.ab-btn-secondary {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  transition: all .2s ease;
}
.ab-btn-primary {
  background: var(--brand, #3155d4);
  color: #fff !important;
  box-shadow: 0 6px 18px rgba(49,85,212,.28);
}
.ab-btn-primary:hover {
  background: var(--brand-hover, #2647b8);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(49,85,212,.35);
}
.ab-btn-secondary {
  background: #fff;
  color: var(--brand, #3155d4) !important;
  border: 1px solid var(--brand-soft-2, #e0e7fa);
}
.ab-btn-secondary:hover {
  border-color: var(--brand, #3155d4);
  background: var(--brand-soft, #ecf0fb);
}

.ab-hero-tagline {
  font-size: 13px;
  color: #94a3b8;
  letter-spacing: 6px;
  font-weight: 500;
  text-transform: uppercase;
}

/* Hero 左右分栏 */
.ab-hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  max-width: 1080px;
  text-align: left;
}
.ab-hero-split .ab-tag {
  margin-bottom: 20px;
}
.ab-hero-split .ab-hero-title {
  font-size: 54px;
  line-height: 1.15;
  margin-bottom: 20px;
}
.ab-hero-split .ab-hero-sub {
  margin: 0 0 28px;
  font-size: 18px;
  line-height: 1.7;
  color: #475569;
}
.ab-hero-split .ab-hero-actions {
  justify-content: flex-start;
  margin-bottom: 0;
}
.ab-hero-scene {
  position: relative;
  line-height: 0;
}
.ab-hero-scene svg {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 24px 40px rgba(49, 85, 212, 0.12));
}

@media (max-width: 960px) {
  .ab-hero-split {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }
  .ab-hero-split .ab-hero-actions { justify-content: center; }
  .ab-hero-split .ab-hero-title { font-size: 36px; }
  .ab-hero-split .ab-hero-sub { font-size: 15px; }
  .ab-hero-scene { max-width: 440px; margin: 0 auto; order: -1; }
}
@media (max-width: 480px) {
  .ab-hero-split .ab-hero-title { font-size: 30px; }
  .ab-hero-scene { max-width: 320px; }
}

@media (max-width: 768px) {
  .ab-hero { padding: 40px 20px 44px; }
  .ab-tag { margin-bottom: 18px; font-size: 12px; padding: 5px 14px; }
  .ab-hero-title { font-size: 34px; letter-spacing: -.3px; line-height: 1.2; margin-bottom: 16px; }
  .ab-hero-sub-small { font-size: 12.5px; margin-bottom: 14px; }
  .ab-hero-sub { font-size: 15px; line-height: 1.65; margin-bottom: 24px; }
  .ab-hero-sub br { display: none; }
  .ab-hero-actions { margin-bottom: 24px; gap: 10px; }
  .ab-btn-primary, .ab-btn-secondary { padding: 11px 22px; font-size: 14px; }
  .ab-hero-tagline { font-size: 11px; letter-spacing: 3px; }
}

/* ============ 通用 Section ============ */
.ab-section {
  padding: 72px 32px;
  position: relative;
}
.ab-section-alt {
  background: #fafbff;
}
.ab-section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 48px;
  position: relative;
}
.ab-title-deco {
  width: 36px; height: 3px;
  background: linear-gradient(90deg, var(--brand, #3155d4), #7a93f0);
  border-radius: 2px;
  margin: 0 auto 16px;
}
.ab-eyebrow {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand, #3155d4);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.ab-section-title {
  font-size: 34px;
  font-weight: 800;
  color: #0f172a;
  margin: 0 0 12px;
  line-height: 1.3;
  letter-spacing: -.5px;
}
.ab-section-sub {
  font-size: 16px;
  color: #64748b;
  margin: 0;
  line-height: 1.65;
}

@media (max-width: 768px) {
  .ab-section { padding: 44px 20px; }
  .ab-section-head { margin-bottom: 28px; }
  .ab-title-deco { margin-bottom: 12px; }
  .ab-eyebrow { font-size: 11px; letter-spacing: 2px; margin-bottom: 8px; }
  .ab-section-title { font-size: 22px; letter-spacing: 0; line-height: 1.35; }
  .ab-section-sub { font-size: 14px; }
}

/* ============ Tension（核心矛盾对比） ============ */
.ab-tension {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
  position: relative;
}
.ab-tension::before {
  content: 'VS';
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 48px; height: 48px;
  background: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  color: #94a3b8;
  font-size: 14px;
  letter-spacing: .5px;
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
  z-index: 2;
}
@media (max-width: 768px) {
  .ab-tension { grid-template-columns: 1fr; gap: 14px; }
  .ab-tension::before {
    content: 'VS';
    display: flex;
    position: relative;
    left: auto; top: auto;
    transform: none;
    margin: -8px auto;
    width: 38px; height: 38px;
    font-size: 12px;
    order: 1;
  }
  .ab-tension-no { order: 0; }
  .ab-tension-yes { order: 2; }
}
.ab-tension-col {
  padding: 28px 24px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid #e5e7eb;
}
@media (max-width: 768px) {
  .ab-tension-col { padding: 22px 20px; }
}
.ab-tension-no {
  border-color: rgba(239,68,68,.18);
  background: linear-gradient(180deg, rgba(239,68,68,.02), #fff);
}
.ab-tension-yes {
  border-color: rgba(49,85,212,.2);
  background: linear-gradient(180deg, rgba(49,85,212,.03), #fff);
}
.ab-tension-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: 14px;
}
.ab-tension-badge-no {
  background: rgba(239,68,68,.1);
  color: #dc2626;
}
.ab-tension-badge-yes {
  background: var(--brand-soft, #ecf0fb);
  color: var(--brand, #3155d4);
}
.ab-tension-headline {
  font-size: 20px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 10px;
}
.ab-tension-body {
  font-size: 14.5px;
  color: #475569;
  line-height: 1.75;
  margin: 0;
}
@media (max-width: 768px) {
  .ab-tension-headline { font-size: 17px; }
  .ab-tension-body { font-size: 13.5px; }
}

/* ============ 金句区块（深色撞色） ============ */
.ab-quote {
  padding: 64px 32px;
  background: linear-gradient(135deg, #0f172a 0%, #1e2a5a 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.ab-quote::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(49,85,212,.4), transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}
.ab-quote-mark {
  font-family: Georgia, serif;
  font-size: 96px;
  line-height: 1;
  color: var(--brand, #3155d4);
  opacity: .5;
  height: 32px;
  margin-bottom: 12px;
  position: relative;
}
.ab-quote-text {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -.3px;
  position: relative;
}
.ab-quote-hl {
  background: linear-gradient(120deg, #7a93f0, #a8bef5);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
@media (max-width: 768px) {
  .ab-quote { padding: 44px 20px; }
  .ab-quote-text { font-size: 18px; line-height: 1.6; }
  .ab-quote-text br { display: none; }
  .ab-quote-mark { font-size: 48px; height: 22px; }
}

/* ============ 三角色 ============ */
.ab-roles {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 0 auto 48px;
  max-width: 900px;
}
.ab-role {
  flex: 1;
  padding: 28px 20px;
  border-radius: 16px;
  text-align: center;
  background: #fff;
  border: 1px solid #e5e7eb;
  transition: all .2s ease;
}
.ab-role:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(0,0,0,.05); }
.ab-role-student { border-top: 4px solid #10b981; }
.ab-role-teacher { border-top: 4px solid #f59e0b; }
.ab-role-ai { border-top: 4px solid var(--brand, #3155d4); background: linear-gradient(180deg, rgba(49,85,212,.04), #fff); }
.ab-role-arrow {
  color: #cbd5e1;
  font-size: 22px;
  font-weight: 700;
  flex-shrink: 0;
}
.ab-role-arrow-support {
  color: var(--brand, #3155d4);
}
.ab-role-icon {
  width: 48px; height: 48px;
  margin: 0 auto 14px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: #f3f4f6;
  color: #4b5563;
}
.ab-role-student .ab-role-icon { background: rgba(16,185,129,.12); color: #10b981; }
.ab-role-teacher .ab-role-icon { background: rgba(245,158,11,.14); color: #d97706; }
.ab-role-ai .ab-role-icon { background: var(--brand-soft, #ecf0fb); color: var(--brand, #3155d4); }
.ab-role-icon svg { width: 24px; height: 24px; }
.ab-role-title {
  font-size: 16px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 6px;
}
.ab-role-desc {
  font-size: 13px;
  color: #64748b;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .ab-roles {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    margin-bottom: 28px;
  }
  .ab-role { padding: 16px 8px; border-radius: 12px; }
  .ab-role-icon { width: 36px; height: 36px; margin-bottom: 8px; border-radius: 10px; }
  .ab-role-icon svg { width: 18px; height: 18px; }
  .ab-role-title { font-size: 14px; margin-bottom: 4px; }
  .ab-role-desc { font-size: 12px; line-height: 1.5; }
  .ab-role-arrow { display: none; }
}

/* ============ 三原则 ============ */
.ab-principles {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 920px;
  margin: 0 auto;
}
.ab-principle {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  transition: all .2s ease;
}
.ab-principle:hover {
  border-color: var(--brand-soft-2, #e0e7fa);
  box-shadow: 0 8px 24px rgba(49,85,212,.04);
}
.ab-principle-num {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand, #3155d4), #7a93f0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  flex-shrink: 0;
  font-family: "SF Mono", Menlo, monospace;
}
.ab-principle-content { flex: 1; min-width: 0; }
.ab-principle-title {
  font-size: 17px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 8px;
}
.ab-principle-content p {
  margin: 0;
  font-size: 14.5px;
  color: #475569;
  line-height: 1.75;
}
.ab-principle-content strong { color: #0f172a; font-weight: 600; }

@media (max-width: 768px) {
  .ab-principle { padding: 18px; gap: 14px; border-radius: 12px; }
  .ab-principle-num { font-size: 26px; }
  .ab-principle-title { font-size: 15px; margin-bottom: 6px; }
  .ab-principle-content p { font-size: 13.5px; line-height: 1.7; }
}

/* ============ 核心能力（4 张卡片） ============ */
.ab-capabilities {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 560px) { .ab-capabilities { grid-template-columns: 1fr; gap: 12px; } }
.ab-cap {
  padding: 24px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  transition: all .25s ease;
  position: relative;
  overflow: hidden;
}
@media (max-width: 560px) { .ab-cap { padding: 20px; } }
.ab-cap::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand, #3155d4), #7a93f0);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.ab-cap:hover {
  border-color: var(--brand, #3155d4);
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(49,85,212,.08);
}
.ab-cap:hover::before { transform: scaleX(1); }

.ab-cap-num {
  display: inline-block;
  padding: 4px 10px;
  background: var(--brand-soft, #ecf0fb);
  color: var(--brand, #3155d4);
  font-family: "SF Mono", Menlo, monospace;
  font-weight: 700;
  font-size: 11px;
  border-radius: 6px;
  margin-bottom: 12px;
  letter-spacing: .8px;
}
.ab-cap-title {
  font-size: 18px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 8px;
  line-height: 1.4;
}
.ab-cap-desc {
  margin: 0;
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
}
@media (max-width: 560px) {
  .ab-cap-title { font-size: 16px; }
  .ab-cap-desc { font-size: 13.5px; }
}

/* ============ 界面预览 ============ */
.ab-preview { max-width: 1080px; margin: 0 auto; }
.ab-preview-main {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 24px;
}
@media (max-width: 900px) { .ab-preview-main { grid-template-columns: 1fr; gap: 16px; margin-bottom: 16px; } }
.ab-preview-caption { padding: 0 8px; }
.ab-preview-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--brand, #3155d4);
  margin-bottom: 8px;
  letter-spacing: .5px;
}
.ab-preview-desc {
  font-size: 15px;
  color: #475569;
  line-height: 1.7;
}
.ab-preview-shot {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid #e5e7eb;
  background: #f8fafc;
  box-shadow: 0 24px 48px -16px rgba(0,0,0,.08);
}
.ab-preview-shot img {
  display: block;
  width: 100%;
  height: auto;
}
.ab-preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 768px) { .ab-preview-grid { gap: 16px; } }
.ab-preview-grid .ab-preview-item {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ab-preview-grid .ab-preview-label { margin-bottom: 4px; }

/* ============ 关键时刻 ============ */
.ab-moments {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  max-width: 1080px;
  margin: 0 auto;
}
@media (max-width: 900px) { .ab-moments { grid-template-columns: 1fr; gap: 12px; } }
.ab-moment {
  padding: 24px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  position: relative;
  transition: all .2s ease;
}
@media (max-width: 768px) { .ab-moment { padding: 20px; } }
.ab-moment:hover {
  border-color: var(--brand-soft-2, #e0e7fa);
  box-shadow: 0 8px 24px rgba(49,85,212,.05);
}
.ab-moment-time {
  display: inline-block;
  padding: 4px 12px;
  background: #0f172a;
  color: #fff;
  font-family: "SF Mono", Menlo, monospace;
  font-weight: 700;
  font-size: 13px;
  border-radius: 6px;
  margin-bottom: 16px;
  letter-spacing: .5px;
}
.ab-moment-title {
  font-size: 17px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 12px;
}
.ab-moment-before,
.ab-moment-after {
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 13.5px;
  line-height: 1.65;
  position: relative;
}
.ab-moment-before {
  background: #f8fafc;
  color: #64748b;
  margin-bottom: 10px;
  text-decoration: line-through;
  text-decoration-color: rgba(100,116,139,.3);
  text-decoration-thickness: 1px;
}
.ab-moment-after {
  background: var(--brand-soft, #ecf0fb);
  color: #0f172a;
  font-weight: 500;
}
.ab-moment-before::before,
.ab-moment-after::before {
  position: absolute;
  left: -6px; top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 70%;
  border-radius: 2px;
}
.ab-moment-after::before {
  content: '';
  background: var(--brand, #3155d4);
}

/* ============ 边界 ============ */
.ab-boundary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
@media (max-width: 768px) { .ab-boundary { grid-template-columns: 1fr; gap: 12px; } }
.ab-boundary-col {
  padding: 26px;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
}
@media (max-width: 768px) { .ab-boundary-col { padding: 22px; } }
.ab-boundary-no { border-top: 4px solid #dc2626; }
.ab-boundary-yes { border-top: 4px solid #059669; }
.ab-boundary-title {
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.ab-boundary-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
}
.ab-boundary-no .ab-boundary-icon {
  background: rgba(239,68,68,.12);
  color: #dc2626;
}
.ab-boundary-yes .ab-boundary-icon {
  background: rgba(16,185,129,.12);
  color: #059669;
}
.ab-boundary-col ul {
  margin: 0; padding: 0; list-style: none;
}
.ab-boundary-col li {
  position: relative;
  padding: 9px 0 9px 22px;
  font-size: 14px;
  color: #374151;
  line-height: 1.65;
  border-bottom: 1px dashed #e5e7eb;
}
.ab-boundary-col li:last-child { border-bottom: none; }
.ab-boundary-col li::before {
  content: '';
  position: absolute;
  left: 0; top: 18px;
  width: 8px; height: 2px;
  border-radius: 1px;
}
.ab-boundary-no li::before { background: #dc2626; }
.ab-boundary-yes li::before { background: #059669; }

/* ============ CTA ============ */
.ab-cta {
  padding: 80px 32px;
  background: linear-gradient(135deg, #0f172a 0%, #1a2555 50%, #2647b8 100%);
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.ab-cta-deco {
  position: absolute;
  top: -150px; left: 50%;
  transform: translateX(-50%);
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(49,85,212,.3) 0%, transparent 60%);
  filter: blur(60px);
  pointer-events: none;
}
.ab-cta-title {
  font-size: 44px;
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -.8px;
  position: relative;
  line-height: 1.2;
}
.ab-cta-dot {
  color: var(--brand, #7a93f0);
  margin: 0 12px;
  position: relative;
  top: -4px;
}
.ab-cta-sub {
  font-size: 16px;
  color: rgba(255,255,255,.7);
  margin: 0 0 36px;
  position: relative;
}
.ab-cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}
.ab-cta .ab-btn-primary {
  background: #fff;
  color: var(--brand, #3155d4) !important;
  box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.ab-cta .ab-btn-primary:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(0,0,0,.3);
}
.ab-cta .ab-btn-secondary {
  background: transparent;
  color: #fff !important;
  border-color: rgba(255,255,255,.3);
}
.ab-cta .ab-btn-secondary:hover {
  background: rgba(255,255,255,.1);
  border-color: #fff;
}

@media (max-width: 768px) {
  .ab-cta { padding: 52px 20px; }
  .ab-cta-title { font-size: 26px; letter-spacing: -.3px; }
  .ab-cta-sub { font-size: 13.5px; margin-bottom: 28px; }
  .ab-cta-dot { margin: 0 6px; }
}

/* ============ Footer ============ */
.ab-footer {
  padding: 32px 0;
  border-top: 1px solid #e5e7eb;
  background: #fff;
}
.ab-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.ab-footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: #374151;
  font-size: 14px;
}
.ab-footer-brand .ab-logo-sm { color: var(--brand, #3155d4); }
.ab-footer-meta {
  font-size: 13px;
  color: #94a3b8;
}