/* ============================================
 * about.html · VI 综合升级版
 * 独立样式，避免污染首页 styles.css
 * ============================================ */

body.about-page-vi {
  margin: 0; background: #F5F7FB;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: #0A2540; line-height: 1.6;
}
body.about-page-vi a.active { color: #2563EB; }

.about-vi-wrap {
  max-width: 1200px; margin: 0 auto;
  padding: 30px 40px 60px;
  display: flex; flex-direction: column; gap: 50px;
}

/* Hero */
.vi-hero {
  padding: 60px 50px; text-align: center;
  background: linear-gradient(135deg, #0A2540 0%, #1E3A8A 60%, #2563EB 100%);
  border-radius: 20px; color: #fff;
  position: relative; overflow: hidden;
}
.vi-hero::before, .vi-hero::after { content:''; position: absolute; border-radius: 50%; background: rgba(255,255,255,.06); }
.vi-hero::before { width: 200px; height: 200px; top: -60px; left: -50px; }
.vi-hero::after { width: 260px; height: 260px; bottom: -100px; right: -80px; }
.vi-hero-tag { display: inline-block; padding: 6px 16px; margin-bottom: 20px; background: rgba(255,255,255,.15); color: #93C5FD; border-radius: 999px; font-size: 12.5px; font-weight: 700; letter-spacing: 2px; position: relative; z-index: 1; }
.vi-hero h1 { margin: 0 0 16px; font-size: 42px; font-weight: 900; line-height: 1.3; position: relative; z-index: 1; }
.vi-hero h1 em { color: #93C5FD; font-style: normal; }
.vi-hero-desc { margin: 0 auto; max-width: 640px; font-size: 16px; line-height: 1.85; color: rgba(255,255,255,.85); position: relative; z-index: 1; }
.vi-hero-tags { margin: 26px 0 0; display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; position: relative; z-index: 1; }
.vi-hero-tags span { padding: 6px 14px; background: rgba(255,255,255,.12); border-radius: 999px; font-size: 12.5px; color: #fff; }

/* 数据大盘 */
.vi-stats-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.vi-stat-item { padding: 22px 12px; text-align: center; background: #fff; border-radius: 12px; box-shadow: 0 4px 14px rgba(10,37,64,.05); }
.vi-stat-num { display: block; font-size: 28px; font-weight: 900; color: #2563EB; line-height: 1.1; }
.vi-stat-lbl { display: block; margin-top: 6px; font-size: 12.5px; color: #526074; }

/* 通用小节 */
.vi-block { background: #fff; padding: 40px 36px; border-radius: 16px; box-shadow: 0 4px 14px rgba(10,37,64,.05); }
.vi-block-head { text-align: center; margin-bottom: 32px; }
.vi-block-tag { display: inline-block; padding: 4px 12px; background: rgba(37,99,235,.08); color: #2563EB; border-radius: 999px; font-size: 12px; font-weight: 700; letter-spacing: 1.5px; margin-bottom: 10px; }
.vi-block-head h2 { margin: 0 0 8px; font-size: 26px; color: #0A2540; }
.vi-block-head p { margin: 0; color: #526074; font-size: 14.5px; }

/* 品牌信念 */
.vi-belief-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.vi-belief { padding: 24px 20px; text-align: center; border-radius: 12px; border-top: 4px solid var(--vbc); background: color-mix(in srgb, var(--vbc) 4%, #fff); }
.vi-belief[data-i="1"]{--vbc:#2563EB;} .vi-belief[data-i="2"]{--vbc:#059669;} .vi-belief[data-i="3"]{--vbc:#D97706;} .vi-belief[data-i="4"]{--vbc:#7C3AED;}
.vi-belief-word { display: inline-flex; width: 56px; height: 56px; align-items: center; justify-content: center; margin: 0 auto 12px; background: var(--vbc); color: #fff; font-size: 26px; font-weight: 900; border-radius: 14px; }
.vi-belief h4 { margin: 0 0 6px; color: var(--vbc); font-size: 16px; }
.vi-belief p { margin: 0; color: #526074; font-size: 13px; line-height: 1.6; }

/* 独家特色 5 卡 */
.vi-features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.vi-feature { padding: 24px; background: #F8FAFC; border-radius: 12px; border-left: 4px solid #2563EB; }
.vi-feature-num { display: block; font-size: 13px; color: #94A3B8; font-weight: 700; letter-spacing: 1px; margin-bottom: 8px; }
.vi-feature h4 { margin: 0 0 8px; font-size: 17px; color: #0A2540; }
.vi-feature p { margin: 0; font-size: 13.5px; color: #526074; line-height: 1.7; }

/* 教研五重筛选 */
.vi-funnel { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.vi-funnel-step { padding: 22px 14px; text-align: center; background: linear-gradient(180deg, color-mix(in srgb, var(--fs) 12%, #fff) 0%, #fff 100%); border: 2px solid color-mix(in srgb, var(--fs) 30%, transparent); border-radius: 12px; }
.vi-funnel-step[data-i="1"]{--fs:#2563EB;} .vi-funnel-step[data-i="2"]{--fs:#0EA5E9;}
.vi-funnel-step[data-i="3"]{--fs:#059669;} .vi-funnel-step[data-i="4"]{--fs:#D97706;}
.vi-funnel-step[data-i="5"]{--fs:#7C3AED;}
.vi-funnel-num { display: inline-flex; width: 40px; height: 40px; align-items: center; justify-content: center; background: var(--fs); color: #fff; font-size: 15px; font-weight: 900; border-radius: 12px; margin-bottom: 10px; }
.vi-funnel-step strong { display: block; margin-bottom: 6px; color: var(--fs); font-size: 15px; }
.vi-funnel-step p { margin: 0; font-size: 12.5px; color: #526074; line-height: 1.55; }

/* 专项师资分工 */
.vi-subjects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.vi-subject { padding: 18px 20px; border-radius: 12px; border-left: 4px solid var(--sc); background: color-mix(in srgb, var(--sc) 5%, #fff); }
.vi-subject[data-i="1"]{--sc:#2563EB;} .vi-subject[data-i="2"]{--sc:#059669;} .vi-subject[data-i="3"]{--sc:#D97706;}
.vi-subject h4 { margin: 0 0 6px; color: var(--sc); font-size: 15px; }
.vi-subject p { margin: 0; font-size: 13px; color: #3a4a63; line-height: 1.7; }

/* 教研团队 */
.vi-team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.vi-teacher { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 26px 20px; background: linear-gradient(180deg, #F8FAFF 0%, #fff 60%); border-radius: 12px; border: 1px solid rgba(10,37,64,.06); }
.vi-teacher-avatar { width: 88px; height: 88px; border-radius: 50%; margin-bottom: 14px; display: flex; align-items: center; justify-content: center; font-size: 36px; color: #fff; background: linear-gradient(135deg, var(--vta) 0%, var(--vtb) 100%); box-shadow: 0 8px 20px rgba(10,37,64,.10); }
.vi-teacher[data-c="blue"]  { --vta: #60A5FA; --vtb: #2563EB; }
.vi-teacher[data-c="green"] { --vta: #34D399; --vtb: #059669; }
.vi-teacher[data-c="amber"] { --vta: #FBBF24; --vtb: #D97706; }
.vi-teacher strong { display: block; font-size: 16px; color: #0A2540; margin-bottom: 4px; }
.vi-teacher-sub { display: block; font-size: 12.5px; color: #526074; margin-bottom: 10px; }
.vi-teacher p { margin: 0; font-size: 13px; color: #526074; line-height: 1.65; }
.vi-teacher-facts { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; margin-top: 12px; }
.vi-teacher-facts span { padding: 3px 8px; background: rgba(37,99,235,.08); color: #2563EB; border-radius: 6px; font-size: 11.5px; font-weight: 600; }

/* 6 类适配人群 */
.vi-persona-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.vi-persona { padding: 22px 20px; border-radius: 12px; background: linear-gradient(135deg, color-mix(in srgb, var(--pc) 10%, #fff) 0%, #fff 65%); border-top: 4px solid var(--pc); transition: transform .25s ease, box-shadow .25s ease; }
.vi-persona:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(10,37,64,.08); }
.vi-persona[data-i="1"]{--pc:#2563EB;} .vi-persona[data-i="2"]{--pc:#DC2626;}
.vi-persona[data-i="3"]{--pc:#D97706;} .vi-persona[data-i="4"]{--pc:#7C3AED;}
.vi-persona[data-i="5"]{--pc:#059669;} .vi-persona[data-i="6"]{--pc:#0EA5E9;}
.vi-persona-icon { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; margin-bottom: 12px; background: color-mix(in srgb, var(--pc) 15%, transparent); border-radius: 12px; font-size: 22px; }
.vi-persona h4 { margin: 0 0 6px; color: var(--pc); font-size: 15px; }
.vi-persona p { margin: 0; font-size: 13.5px; color: #526074; line-height: 1.7; }

/* 学员案例 */
.vi-cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.vi-case { padding: 24px; background: #fff; border-radius: 12px; border: 1px solid rgba(10,37,64,.08); position: relative; }
.vi-case-badge { position: absolute; top: -12px; left: 20px; padding: 4px 12px; background: #059669; color: #fff; font-size: 12px; font-weight: 700; border-radius: 999px; }
.vi-case h4 { margin: 8px 0 6px; font-size: 15px; color: #0A2540; }
.vi-case-meta { display: block; font-size: 12.5px; color: #94A3B8; margin-bottom: 10px; }
.vi-case p { margin: 0 0 12px; font-size: 13.5px; color: #526074; line-height: 1.7; }
.vi-case-result { padding: 10px 14px; background: #ECFDF5; color: #059669; border-radius: 8px; font-size: 13px; font-weight: 700; text-align: center; }
.vi-case-result strong { color: #047857; font-size: 16px; }

/* 家长评价墙 */
.vi-voice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.vi-voice { padding: 22px; background: #F8FAFC; border-radius: 12px; border-left: 4px solid #2563EB; }
.vi-voice-stars { color: #FBBF24; font-size: 14px; letter-spacing: 2px; margin-bottom: 8px; }
.vi-voice-text { margin: 0 0 12px; font-size: 14px; color: #3a4a63; line-height: 1.75; }
.vi-voice-meta { display: flex; align-items: center; gap: 10px; }
.vi-voice-avatar { width: 34px; height: 34px; border-radius: 50%; background: linear-gradient(135deg, #60A5FA, #2563EB); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; }
.vi-voice-name { display: block; font-size: 13.5px; font-weight: 700; color: #0A2540; }
.vi-voice-role { display: block; font-size: 12px; color: #94A3B8; }

/* 品牌终极收口 */
.vi-final { padding: 70px 40px; text-align: center; border-radius: 20px; background: linear-gradient(135deg, #0A2540 0%, #1E3A8A 100%); color: #fff; overflow: hidden; position: relative; }
.vi-final::before { content: ''; position: absolute; inset: -50%; background: radial-gradient(circle at 30% 40%, rgba(96,165,250,.15), transparent 40%), radial-gradient(circle at 70% 60%, rgba(147,197,253,.10), transparent 40%); }
.vi-final > * { position: relative; z-index: 1; }
.vi-final-tag { display: inline-block; padding: 6px 20px; background: rgba(255,255,255,.14); backdrop-filter: blur(4px); color: #93C5FD; border-radius: 999px; font-size: 13px; font-weight: 700; letter-spacing: 3px; margin-bottom: 18px; }
.vi-final h2 { margin: 0 0 18px !important; font-size: 52px !important; font-weight: 900 !important; letter-spacing: 4px; color: #fff !important; text-shadow: 0 4px 24px rgba(37,99,235,.35); }
.vi-final h2 em { color: #FBBF24; font-style: normal; }
.vi-final-sub { margin: 0 auto 30px; max-width: 640px; font-size: 15.5px; line-height: 1.85; color: rgba(255,255,255,.85); }
.vi-final-cta { display: inline-flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.vi-final-btn { padding: 14px 32px; font-size: 15px; font-weight: 700; background: #fff; color: #2563EB; border-radius: 999px; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease; }
.vi-final-btn.ghost { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.5); }
.vi-final-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(0,0,0,.2); }

@media (max-width: 900px) {
  .about-vi-wrap { padding: 20px 16px 40px; gap: 30px; }
  .vi-hero { padding: 40px 24px; }
  .vi-hero h1 { font-size: 26px; }
  .vi-stats-grid { grid-template-columns: repeat(3, 1fr); }
  .vi-block { padding: 30px 20px; }
  .vi-belief-grid { grid-template-columns: repeat(2, 1fr); }
  .vi-features-grid { grid-template-columns: 1fr; }
  .vi-funnel { grid-template-columns: repeat(2, 1fr); }
  .vi-subjects { grid-template-columns: 1fr; }
  .vi-team-grid { grid-template-columns: 1fr; }
  .vi-persona-grid { grid-template-columns: 1fr 1fr; }
  .vi-cases-grid { grid-template-columns: 1fr; }
  .vi-voice-grid { grid-template-columns: 1fr; }
  .vi-final { padding: 44px 20px; }
  .vi-final h2 { font-size: 30px !important; letter-spacing: 2px; }
  .vi-final-tag { font-size: 11.5px; letter-spacing: 2px; padding: 5px 16px; }
}