/* ============================================================
   知几数科 · 品牌官网样式
   设计语言：深邃靛蓝 × 鎏金光点 × 宋体书卷气 → 东方高级感
   ============================================================ */
:root{
  --ink:      #0a1428;   /* 深夜蓝 */
  --ink-2:    #0f1e3d;
  --ink-3:    #16294f;
  --gold:     #c9a86a;   /* 鎏金 */
  --gold-2:   #e6cf9a;
  --cyan:     #35c4e8;   /* logo 青 */
  --cyan-2:   #1a7fbf;
  --text:     #eef2f8;
  --text-dim: #9aa8c2;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans:  "Noto Sans SC", "PingFang SC", sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--ink);color:var(--text);font-family:var(--sans);font-weight:300;line-height:1.8;overflow-x:hidden}
::selection{background:var(--gold);color:var(--ink)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:1160px;margin:0 auto;padding:0 32px}

/* ---------- 通用标题 ---------- */
.sec-eyebrow{font-size:12px;letter-spacing:.45em;color:var(--gold);font-weight:500;text-transform:uppercase}
.sec-title{font-family:var(--serif);font-size:clamp(30px,4.4vw,50px);font-weight:700;line-height:1.35;margin:14px 0 8px}
.sec-title em{font-style:normal;background:linear-gradient(120deg,var(--gold-2),var(--gold) 60%,var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-desc{color:var(--text-dim);max-width:640px;margin-top:6px}
.section{padding:120px 0;position:relative}

/* ---------- 导航 ---------- */
.nav{position:fixed;inset:0 0 auto;z-index:100;transition:.4s}
.nav-inner{max-width:1280px;margin:0 auto;padding:18px 32px;display:flex;align-items:center;justify-content:space-between}
.nav.scrolled{background:rgba(10,20,40,.82);backdrop-filter:blur(16px);box-shadow:0 1px 0 rgba(201,168,106,.15)}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{width:40px;height:40px;filter:drop-shadow(0 0 12px rgba(53,196,232,.45))}
.brand-text{font-family:var(--serif);font-size:20px;font-weight:700;letter-spacing:.12em;display:inline-flex;flex-direction:column;align-items:center;line-height:1.15;text-align:center}
.brand-text em{font-style:normal;font-family:var(--sans);font-size:10px;letter-spacing:.32em;color:var(--gold);font-weight:400;margin-top:4px;text-indent:.32em}
.nav-links{display:flex;gap:34px;font-size:14px;letter-spacing:.18em}
.nav-links a{position:relative;padding:6px 0;color:var(--text-dim);transition:.3s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:linear-gradient(90deg,var(--gold),transparent);transition:.35s}
.nav-links a:hover{color:var(--text)}
.nav-links a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--gold);transition:.3s}

/* ---------- Hero ---------- */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;position:relative;overflow:hidden}
#heroCanvas{position:absolute;inset:0;width:100%;height:100%}
.hero-glow{position:absolute;inset:0;background:
  radial-gradient(ellipse 60% 45% at 50% 38%,rgba(26,127,191,.28),transparent 70%),
  radial-gradient(ellipse 40% 30% at 50% 60%,rgba(201,168,106,.12),transparent 70%);pointer-events:none}
.hero-content{position:relative;z-index:2;padding:120px 24px 80px;max-width:900px}
.hero-logo{width:clamp(120px,17vw,190px);margin:0 auto 26px;filter:drop-shadow(0 8px 40px rgba(53,196,232,.5));animation:float 6s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.hero-eyebrow{font-size:13px;letter-spacing:.6em;color:var(--gold);margin-bottom:18px;text-indent:.6em}
.hero-title{font-family:var(--serif);font-size:clamp(44px,8vw,88px);font-weight:900;letter-spacing:.16em;text-indent:.16em;
  background:linear-gradient(180deg,#fff 30%,#b9c8e4 75%,#7d93bd);-webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 80px rgba(53,196,232,.25)}
.hero-quote{margin:30px auto 8px;font-family:var(--serif);font-size:clamp(15px,2vw,19px);color:var(--gold-2);letter-spacing:.12em}
.hero-quote span{display:block;font-size:12px;color:var(--text-dim);margin-top:8px;letter-spacing:.2em}
.hero-sub{margin-top:22px;color:var(--text-dim);font-size:clamp(14px,1.6vw,17px);letter-spacing:.1em}
.hero-cta{margin-top:44px;display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;padding:15px 38px;border-radius:999px;font-size:15px;letter-spacing:.2em;transition:.35s;border:1px solid transparent}
.btn-primary{background:linear-gradient(120deg,var(--cyan-2),var(--cyan));color:#fff;box-shadow:0 8px 32px rgba(53,196,232,.35)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 44px rgba(53,196,232,.5)}
.btn-ghost{border-color:rgba(201,168,106,.5);color:var(--gold-2)}
.btn-ghost:hover{background:rgba(201,168,106,.1);transform:translateY(-3px)}
.hero-scroll{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);font-size:11px;letter-spacing:.4em;color:var(--text-dim);display:flex;flex-direction:column;align-items:center;gap:10px;z-index:2}
.hero-scroll i{width:1px;height:44px;background:linear-gradient(180deg,var(--gold),transparent);display:block;animation:drop 2s ease-in-out infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ---------- 关于 ---------- */
.about{background:linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 100%)}
.about-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:56px;margin-top:44px;align-items:start}
.about-main .lead{font-family:var(--serif);font-size:clamp(19px,2.3vw,25px);color:var(--gold-2);margin-bottom:22px;letter-spacing:.06em}
.about-main p{color:var(--text-dim);margin-bottom:16px}
.about-main strong{color:var(--text);font-weight:500}
.about-cards{display:flex;flex-direction:column;gap:22px}
.mini-card{background:rgba(255,255,255,.03);border:1px solid rgba(201,168,106,.18);border-radius:16px;padding:28px 30px;transition:.4s}
.mini-card:hover{border-color:rgba(201,168,106,.5);transform:translateY(-4px);background:rgba(255,255,255,.05)}
.mini-card b{font-family:var(--serif);color:var(--gold);font-size:18px;letter-spacing:.3em;display:block;margin-bottom:10px}
.mini-card p{color:var(--text-dim);font-size:14.5px}

/* ---------- 品牌故事 ---------- */
.story{background:var(--ink-2);overflow:hidden}
.story::before{content:"幾";position:absolute;right:-60px;top:50%;transform:translateY(-50%);font-family:var(--serif);font-size:min(46vw,560px);font-weight:900;color:rgba(201,168,106,.045);line-height:1;pointer-events:none}
.story-body{max-width:760px;margin-top:40px;position:relative;z-index:1}
.story-body p{color:var(--text-dim);margin-bottom:22px;font-size:16.5px}
.story-body strong{color:var(--text);font-weight:500}
.story-sign{margin-top:36px;font-family:var(--serif);color:var(--gold);letter-spacing:.2em}

/* ---------- 价值观 ---------- */
.values{background:linear-gradient(180deg,var(--ink-2),var(--ink))}
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:52px}
.value-card{position:relative;background:rgba(255,255,255,.028);border:1px solid rgba(154,168,194,.14);border-radius:18px;padding:44px 26px 34px;transition:.45s;overflow:hidden}
.value-card::before{content:"";position:absolute;inset:0 0 auto;height:2px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:0;transition:.45s}
.value-card:hover{transform:translateY(-8px);border-color:rgba(201,168,106,.4);background:rgba(255,255,255,.05)}
.value-card:hover::before{opacity:1}
.value-num{font-family:var(--serif);font-size:15px;color:var(--gold);border:1px solid rgba(201,168,106,.4);border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;margin-bottom:22px;letter-spacing:0}
.value-card h3{font-family:var(--serif);font-size:21px;letter-spacing:.2em;margin-bottom:14px}
.value-card p{color:var(--text-dim);font-size:14px}

/* ---------- 课程 ---------- */
.courses{background:var(--ink)}
.courses-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:52px}
.course-card{display:flex;flex-direction:column;background:linear-gradient(165deg,rgba(22,41,79,.6),rgba(15,30,61,.35));border:1px solid rgba(154,168,194,.15);border-radius:20px;padding:36px 30px;transition:.45s;position:relative;overflow:hidden}
.course-card::after{content:"";position:absolute;width:200px;height:200px;border-radius:50%;background:radial-gradient(circle,rgba(53,196,232,.14),transparent 70%);top:-80px;right:-80px;transition:.45s}
.course-card:hover{transform:translateY(-8px);border-color:rgba(53,196,232,.45);box-shadow:0 20px 50px rgba(0,0,0,.35)}
.course-card:hover::after{transform:scale(1.6)}
.course-tag{align-self:flex-start;font-size:11.5px;letter-spacing:.25em;color:var(--gold);border:1px solid rgba(201,168,106,.45);border-radius:999px;padding:5px 14px;margin-bottom:20px}
.course-card h3{font-family:var(--serif);font-size:22px;line-height:1.5;margin-bottom:14px;letter-spacing:.05em}
.course-card p{color:var(--text-dim);font-size:14.5px;flex:1}
.course-meta{margin-top:24px;padding-top:18px;border-top:1px dashed rgba(154,168,194,.2);display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-dim)}
.course-status{font-weight:500;letter-spacing:.1em}
.course-status.hot{color:#ff8f6b}.course-status.open{color:var(--cyan)}.course-status.soon{color:var(--text-dim)}

/* ---------- APP ---------- */
.app{background:linear-gradient(160deg,var(--ink-2),var(--ink-3) 55%,var(--ink-2));overflow:hidden}
.app-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center}
.app-features{list-style:none;margin-top:34px;display:flex;flex-direction:column;gap:20px}
.app-features li{display:flex;flex-direction:column;gap:3px;padding-left:22px;position:relative}
.app-features li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:9px;border-radius:50%;background:radial-gradient(circle,var(--cyan),var(--cyan-2));box-shadow:0 0 12px rgba(53,196,232,.7)}
.app-features b{font-size:16px;font-weight:500;letter-spacing:.08em}
.app-features span{color:var(--text-dim);font-size:14px}
.app-stores{margin-top:40px;display:flex;gap:16px;flex-wrap:wrap}
.store-btn{display:inline-flex;align-items:center;gap:12px;background:rgba(255,255,255,.06);border:1px solid rgba(154,168,194,.3);border-radius:14px;padding:13px 24px;transition:.35s;min-width:170px}
.store-btn small{display:block;font-size:10.5px;letter-spacing:.15em;color:var(--text-dim)}
.store-btn b{font-size:15px;font-weight:500;letter-spacing:.05em}
.store-btn .ic{font-size:22px;line-height:1}
a.store-btn:hover{border-color:var(--gold);background:rgba(201,168,106,.1);transform:translateY(-3px)}
.store-btn.disabled{opacity:.65;cursor:default;border-style:dashed}
.app-visual{display:flex;justify-content:center}
.phone{width:280px;height:560px;border-radius:44px;padding:14px;background:linear-gradient(160deg,#24365f,#101f42);box-shadow:0 40px 90px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.15);position:relative;animation:float 7s ease-in-out infinite}
.phone::before{content:"";position:absolute;top:26px;left:50%;transform:translateX(-50%);width:86px;height:7px;border-radius:99px;background:rgba(0,0,0,.5);z-index:2}
.phone-screen{width:100%;height:100%;border-radius:32px;background:radial-gradient(ellipse 90% 60% at 50% 20%,rgba(26,127,191,.4),transparent 70%),var(--ink);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:32px 22px}
.phone-screen img{width:92px;filter:drop-shadow(0 6px 26px rgba(53,196,232,.55))}
.phone-title{font-family:var(--serif);font-size:30px;font-weight:700;letter-spacing:.4em;text-indent:.4em;margin-top:18px}
.phone-sub{color:var(--gold);font-size:12px;letter-spacing:.35em;text-indent:.35em;margin-top:6px}
.phone-line{width:44px;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);margin:24px 0}
.phone-desc{color:var(--text-dim);font-size:12.5px;letter-spacing:.12em}

/* ---------- 团队 ---------- */
.team{background:var(--ink)}
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:52px}
.team-card{background:rgba(255,255,255,.028);border:1px solid rgba(154,168,194,.14);border-radius:20px;padding:40px 30px;text-align:center;transition:.45s}
.team-card:hover{transform:translateY(-8px);border-color:rgba(201,168,106,.4)}
.team-icon{width:76px;height:76px;margin:0 auto 24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:30px;color:var(--gold);
  background:radial-gradient(circle at 35% 30%,rgba(53,196,232,.25),rgba(201,168,106,.1)),rgba(255,255,255,.04);border:1px solid rgba(201,168,106,.35)}
.team-card h3{font-family:var(--serif);font-size:19px;letter-spacing:.06em;margin-bottom:14px;line-height:1.6}
.team-card p{color:var(--text-dim);font-size:14px}

/* ---------- 连接 ---------- */
.connect{background:linear-gradient(180deg,var(--ink),var(--ink-2))}
.connect-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:52px;max-width:820px}
.connect-card{display:flex;align-items:center;gap:24px;background:rgba(255,255,255,.03);border:1px solid rgba(154,168,194,.16);border-radius:20px;padding:32px;transition:.4s}
.connect-card:hover{border-color:rgba(53,196,232,.45);transform:translateY(-4px)}
.connect-qr{width:104px;height:104px;border-radius:14px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.05);border:1px dashed rgba(201,168,106,.4);color:var(--text-dim);font-size:12px;text-align:center;overflow:hidden}
.connect-qr img{width:100%;height:100%;object-fit:cover}
.connect-info b{font-family:var(--serif);font-size:18px;letter-spacing:.1em;display:block}
.connect-info p{color:var(--text-dim);font-size:13.5px;margin-top:6px}
.connect-info .badge{display:inline-block;margin-top:12px;font-size:11px;letter-spacing:.2em;color:var(--cyan);border:1px solid rgba(53,196,232,.4);border-radius:999px;padding:4px 12px}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink-2);border-top:1px solid rgba(201,168,106,.14);padding:56px 0 40px}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:18px;text-align:center}
.footer-brand{display:flex;align-items:center;gap:14px}
.footer-brand img{width:46px;height:46px}
.footer-brand b{font-family:var(--serif);font-size:19px;letter-spacing:.2em;display:block;text-align:left}
.footer-brand p{font-size:11.5px;color:var(--gold);letter-spacing:.3em;text-align:left}
.footer-links{display:flex;gap:28px;font-size:13px;color:var(--text-dim);letter-spacing:.15em;flex-wrap:wrap;justify-content:center}
.footer-links a:hover{color:var(--gold-2)}
.footer-email{color:var(--gold-2);font-size:13px;letter-spacing:.08em;transition:.3s;margin:-2px 0 -4px}.footer-email:hover{color:var(--gold)}
.footer-icp{font-size:12px;color:rgba(154,168,194,.65);line-height:1.6}
.footer-icp a:hover{color:var(--gold-2)}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .about-grid,.app-grid{grid-template-columns:1fr;gap:44px}
  .values-grid{grid-template-columns:repeat(2,1fr)}
  .courses-grid,.team-grid{grid-template-columns:1fr}
  .connect-grid{grid-template-columns:1fr}
  .app-visual{order:-1}
}
@media(max-width:640px){
  .section{padding:84px 0}
  .nav-links{position:fixed;inset:0;background:rgba(10,20,40,.97);flex-direction:column;align-items:center;justify-content:center;gap:34px;font-size:18px;transform:translateY(-100%);transition:.4s;z-index:-1}
  .nav-links.open{transform:none;z-index:99}
  .nav-toggle{display:flex;z-index:100}
  .values-grid{grid-template-columns:1fr}
  .hero-cta .btn{padding:13px 28px;font-size:14px}
}

/* ---------- 英雄帖 ---------- */
.nav-heroes{color:var(--ink)!important;background:linear-gradient(135deg,var(--gold-2) 0%,var(--gold) 60%,#a8894a 100%);border:0!important;border-radius:999px!important;padding:6px 18px!important;font-weight:500;box-shadow:0 4px 16px rgba(201,168,106,.35),inset 0 1px 0 rgba(255,255,255,.3);transition:all .3s;position:relative}
.nav-heroes:hover{background:linear-gradient(135deg,var(--gold-2) 0%,#f0d99f 50%,var(--gold) 100%)!important;color:var(--ink)!important;transform:translateY(-1px);box-shadow:0 8px 24px rgba(201,168,106,.55),inset 0 1px 0 rgba(255,255,255,.4)}
.heroes{background:linear-gradient(160deg,var(--ink-2),var(--ink-3));overflow:hidden;position:relative}
.heroes::before{content:"帖";position:absolute;right:-40px;bottom:-40px;font-family:var(--serif);font-size:min(38vw,460px);font-weight:900;color:rgba(201,168,106,.035);line-height:1;pointer-events:none}
.heroes-grid{display:flex;flex-direction:column;gap:20px;margin-top:48px;max-width:860px}
.heroes-card{display:flex;align-items:flex-start;gap:22px;background:rgba(255,255,255,.025);border:1px solid rgba(154,168,194,.14);border-radius:18px;padding:32px 34px;transition:.4s}
.heroes-card:hover{border-color:rgba(201,168,106,.45);transform:translateX(8px);background:rgba(255,255,255,.04)}
.heroes-icon{flex-shrink:0;width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:20px;color:var(--gold);border:1px solid rgba(201,168,106,.4);background:radial-gradient(circle at 35% 30%,rgba(53,196,232,.15),transparent)}
.heroes-card p{color:var(--text-dim);font-size:16.5px;line-height:1.8;padding-top:8px}
.heroes-card p strong{color:var(--text);font-weight:500}
.heroes-footer{text-align:center;font-size:17px;color:var(--text-dim);margin-top:44px;line-height:2.2}
.heroes-footer em{font-style:normal;color:var(--gold-2);font-family:var(--serif);font-size:22px;letter-spacing:.15em;display:inline;margin:0 2px;text-indent:.15em}
.heroes-cta{margin-top:38px;display:flex;justify-content:center}

/* ---------- 课程弹窗 ---------- */
.modal-overlay{position:fixed;inset:0;z-index:200;background:rgba(10,20,40,.88);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:.35s;padding:20px}
.modal-overlay.open{opacity:1;pointer-events:auto}
.modal-card{background:linear-gradient(165deg,var(--ink-2),var(--ink-3));border:1px solid rgba(201,168,106,.25);border-radius:24px;max-width:680px;width:100%;max-height:90vh;overflow-y:auto;position:relative;box-shadow:0 30px 80px rgba(0,0,0,.65)}
.modal-close{position:absolute;top:18px;right:22px;background:none;border:0;font-size:30px;color:var(--text-dim);cursor:pointer;transition:.3s;z-index:2;line-height:1}
.modal-close:hover{color:var(--gold)}
.modal-body{padding:44px 38px}
.modal-detail{margin-bottom:36px}
.modal-detail .sec-eyebrow{margin-bottom:6px}
.modal-detail h2{font-family:var(--serif);font-size:28px;margin-bottom:20px}
.modal-intro{color:var(--text-dim);font-size:14.5px;line-height:2}
.modal-intro h4{color:var(--gold);font-family:var(--serif);font-size:17px;letter-spacing:.1em;margin:24px 0 10px}
.modal-intro ul{padding-left:18px;margin:8px 0}
.modal-intro li{margin-bottom:6px;list-style:disc}

.enroll-form h3{font-family:var(--serif);font-size:20px;letter-spacing:.15em;margin-bottom:20px;padding-top:28px;border-top:1px solid rgba(201,168,106,.25)}
.form-row{display:flex;gap:14px;margin-bottom:14px;flex-wrap:wrap}
.form-row input,.form-row select{flex:1;min-width:0;padding:13px 16px;background:rgba(255,255,255,.05);border:1px solid rgba(154,168,194,.25);border-radius:12px;color:var(--text);font-size:14px;font-family:var(--sans);outline:none;transition:.3s}
.form-row input:focus,.form-row select:focus{border-color:var(--gold);background:rgba(255,255,255,.08)}
.form-row select{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23c9a86a'><path d='M6 8L1 3h10z'/></svg>");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px}
.form-row select option{background:var(--ink-2);color:var(--text)}
.date-row .form-group{flex:1;display:flex;flex-direction:column;gap:4px}
.date-row label{font-size:11px;color:var(--text-dim);letter-spacing:.1em}
.date-row select{width:100%}
.btn-submit{margin-top:8px;width:100%;justify-content:center;padding:16px;font-size:16px;letter-spacing:.25em}
.form-note{text-align:center;color:var(--text-dim);font-size:12px;margin-top:14px}
.form-success{display:none;text-align:center;padding:30px 0}
.success-icon{width:80px;height:80px;border-radius:50%;margin:0 auto 24px;display:flex;align-items:center;justify-content:center;font-size:38px;color:var(--cyan);border:2px solid var(--cyan);background:rgba(53,196,232,.1)}
.form-success h3{font-family:var(--serif);font-size:24px;margin-bottom:12px}
.form-success p{color:var(--text-dim);max-width:380px;margin:0 auto 24px}

@media(max-width:640px){
  .modal-body{padding:32px 22px}
  .heroes-card{flex-direction:column;gap:12px;padding:24px 22px}
  .heroes-card:hover{transform:translateX(4px)}
}

/* ---------- 居中文字 letter-spacing 视觉补偿 ----------
 * 原因：text-align:center 遇上 letter-spacing，
 *       文字右侧多出 spacing 宽度，视觉中心会偏左。
 * 修复：text-indent: Xem 等于 letter-spacing，抵消失衡。
 * 同样适用于 inline-block / inline-flex 的按钮、徽章。
 * ---------------------------------------------- */
.sec-eyebrow{text-indent:.45em}
.hero-quote{text-indent:.12em}
.hero-quote span{text-indent:.2em}
.hero-sub{text-indent:.1em}
.btn{text-indent:.2em}
.btn-submit{text-indent:.25em}
.nav-links a{text-indent:.18em}
.nav-heroes{text-indent:0 !important}
.store-btn small{text-indent:.15em}
.store-btn b{text-indent:.05em}
.connect-info .badge{text-indent:.2em}
.enroll-form h3{text-indent:.15em}
.modal-intro h4{text-indent:.1em}
.course-tag{text-indent:.25em}
.course-status{text-indent:.1em}
.app-features b{text-indent:.08em}
.mini-card b{text-indent:.3em}
.value-card h3{text-indent:.2em}
.team-card h3{text-indent:.06em}
.footer-brand b{text-indent:.2em}
.footer-brand p{text-indent:.3em}
.story-sign{text-indent:.2em}
.date-row label{text-indent:.1em}

/* ---------- 修复：左对齐元素的 text-indent 误用 ----------
 * 上一轮批量补偿中，text-indent 加到了所有 letter-spacing 元素上。
 * 但 text-indent 只对 CENTERED（居中）文字有效——它抵消右端的
 * letter-spacing 像素使视觉中心归位。对 LEFT-ALIGNED（左对齐）
 * 文字，text-indent 只会把首字符推右，导致上下行起始 X 错位。
 *
 * 处理：用 flex 容器让多行左对齐文本严格对齐起始位置。
 * ---------------------------------------------- */
.footer-brand > div{display:inline-flex;flex-direction:column;align-items:flex-start}
.footer-brand b,.footer-brand p{text-indent:0}
.mini-card b,.value-card h3,.app-features b,.story-sign,.enroll-form h3,.modal-intro h4,.date-row label,.sec-eyebrow{text-indent:0}

/* ---------- 团队卡片 排版优化 ----------
 * 三个问题：
 *  (1) .team-card h3 的 text-indent:.06em 推右了首行 → 多行时与第二行不齐
 *  (2) 长标题如「香港+内地资深易学专家顾问团」字间断行产生孤行「家顾问团」
 *  (3) 描述尾行单字成行（"业。""清源。"）的孤字问题
 *
 * 修复：
 *  - 去掉 h3 text-indent，让多行严格居中
 *  - text-wrap: balance 浏览器自动平衡行长，避免极端孤行
 *  - 描述两端对齐 + 末行居中（text-align: justify + text-align-last: center）
 *  - 标题字号微调到 18px，给长标题更多呼吸空间
 * ---------------------------------------------- */
.team-card h3{text-indent:0;font-size:18px;text-wrap:balance;line-height:1.5}
.team-card p{text-align:justify;text-justify:inter-ideograph}