/* 苏帕因 AI 学院 · superinbot.com · 共用样式
   色值取自 logo 规范（Superin-SI-Bot 包 README）：标准青绿 #00BDB3 + 深灰 #202B36，白字。 */
:root{
  --bg:#171f28;--bg2:#202B36;--card:#28343f;--line:rgba(255,255,255,.1);
  --ink:#f3f6f8;--ink2:#b8c4cf;--ink3:#7f8d9b;
  --ac:#00BDB3;--ac2:#009b93;--acbg:rgba(0,189,179,.12);
  --warn:#ffb454;--warnbg:rgba(255,180,84,.12);
  --r:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.w{max-width:1120px;margin:0 auto;padding:0 16px}
@media(min-width:700px){.w{padding:0 24px}}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,35,38,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav .w{display:flex;align-items:center;gap:18px;height:60px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16px;white-space:nowrap}
.logo img{width:40px;height:34px;flex:none}
.hero .lockup{width:auto;height:72px;margin:0 0 22px -8px}
@media(max-width:899px){.hero .lockup{height:58px}}
footer .flogo{width:auto;height:48px;margin-bottom:16px;opacity:.9}
.logo small{display:block;font-size:10px;font-weight:600;letter-spacing:1.5px;color:var(--ink3);line-height:1.1}
.nav nav{display:none;gap:18px;margin-left:auto;font-size:14px;color:var(--ink2)}
.nav nav a:hover{color:#fff}
@media(min-width:900px){.nav nav{display:flex}.logo .txt{display:block}}
@media(max-width:899px){.logo .txt{display:none}.nav .btn.sm{margin-left:auto}}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:12px;font-weight:700;font-size:15px;border:0;cursor:pointer;font-family:inherit;white-space:nowrap;transition:transform .15s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.btn.p{background:linear-gradient(135deg,var(--ac),var(--ac2));color:#06201d;box-shadow:0 10px 26px rgba(36,227,191,.28)}
.btn.g{background:rgba(255,255,255,.07);color:#fff;border:1px solid rgba(255,255,255,.22)}
.btn.sm{padding:8px 14px;font-size:13.5px;border-radius:10px}
.btn.full{width:100%}

/* hero */
.hero{position:relative;padding:56px 0 48px;background:radial-gradient(700px 420px at 90% 0%,rgba(36,227,191,.18),transparent 70%),radial-gradient(600px 400px at 0% 100%,rgba(19,184,154,.14),transparent 70%),var(--bg)}
.hero .w{display:grid;grid-template-columns:1fr;gap:32px;align-items:center}
@media(min-width:900px){.hero{padding:80px 0 72px}.hero .w{grid-template-columns:1.1fr .9fr;gap:48px}}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:2px;color:var(--ac);background:var(--acbg);border:1px solid rgba(36,227,191,.35);padding:5px 12px;border-radius:999px;margin-bottom:18px}
h1{font-size:clamp(32px,6vw,54px);line-height:1.18;font-weight:900;letter-spacing:.5px;margin-bottom:14px}
h1 em{font-style:normal;color:var(--ac)}
.hero .lead{font-size:clamp(17px,2.2vw,21px);font-weight:600;color:#fff;margin-bottom:12px}
.hero .desc{font-size:15.5px;color:var(--ink2);margin-bottom:24px;max-width:560px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.fine{font-size:12.5px;color:var(--ink3);max-width:560px}
.hero-fig{position:relative;border-radius:24px;overflow:hidden;border:1px solid var(--line);box-shadow:0 30px 70px rgba(0,0,0,.45);aspect-ratio:4/5;max-width:440px;margin:0 auto;width:100%}
.hero-fig img{width:100%;height:100%;object-fit:cover}
.hero-fig .cap{position:absolute;left:0;right:0;bottom:0;padding:40px 18px 16px;background:linear-gradient(transparent,rgba(6,25,28,.92));font-size:13px;color:var(--ink2)}
.hero-fig .cap b{display:block;color:#fff;font-size:15px}
.bots{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px;max-width:440px;margin-left:auto;margin-right:auto}
.bot{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 8px;text-align:center;font-size:12px;color:var(--ink2)}
.bot i{display:block;width:34px;height:34px;margin:0 auto 6px;border-radius:10px;background:linear-gradient(135deg,var(--ac),var(--ac2));color:#06201d;font-style:normal;font-weight:900;line-height:34px;font-size:15px}

/* sections */
section.s{padding:64px 0}
@media(min-width:900px){section.s{padding:84px 0}}
section.s.alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.kick{font-size:12.5px;font-weight:800;letter-spacing:2.5px;color:var(--ac);text-transform:uppercase;margin-bottom:10px}
h2{font-size:clamp(24px,3.6vw,36px);line-height:1.25;font-weight:800;margin-bottom:12px}
.sub{font-size:15.5px;color:var(--ink2);max-width:680px;margin-bottom:32px}
.grid{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:640px){.grid.c2{grid-template-columns:1fr 1fr}.grid.c4{grid-template-columns:1fr 1fr}}
@media(min-width:960px){.grid.c3{grid-template-columns:repeat(3,1fr)}.grid.c4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:8px;transition:transform .15s,border-color .2s}
.card:hover{transform:translateY(-3px);border-color:rgba(36,227,191,.45)}
.card .ic{width:44px;height:44px;border-radius:12px;background:var(--acbg);color:var(--ac);display:grid;place-items:center;font-size:22px;margin-bottom:4px}
.card h3{font-size:18px;font-weight:800}
.card p{font-size:14.5px;color:var(--ink2)}
.card .who{font-size:12.5px;color:var(--ink3)}
.card .more{margin-top:auto;padding-top:8px;font-size:13.5px;font-weight:700;color:var(--ac)}
.tag{display:inline-block;font-size:11.5px;font-weight:700;padding:2px 9px;border-radius:999px;border:1px solid}
.tag.ok{color:var(--ac);border-color:rgba(36,227,191,.45);background:var(--acbg)}
.tag.wn{color:var(--warn);border-color:rgba(255,180,84,.45);background:var(--warnbg)}
.tag.mu{color:var(--ink2);border-color:var(--line);background:rgba(255,255,255,.04)}

/* list / table */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th,.tbl td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{color:var(--ink3);font-weight:700;font-size:12.5px;letter-spacing:1px}
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* founder */
.founder{display:grid;grid-template-columns:1fr;gap:28px;align-items:center}
@media(min-width:800px){.founder{grid-template-columns:.8fr 1.2fr;gap:48px}}
.founder img{border-radius:20px;border:1px solid var(--line);max-width:360px;width:100%;margin:0 auto}
.founder ul{list-style:none;display:grid;gap:10px;margin:16px 0 22px}
.founder li{padding-left:22px;position:relative;color:var(--ink2);font-size:15px}
.founder li:before{content:"";position:absolute;left:0;top:11px;width:10px;height:10px;border-radius:50%;background:var(--ac)}

/* books */
.books{display:grid;grid-template-columns:1fr;gap:16px;margin:12px 0 20px}
@media(min-width:900px){.books{grid-template-columns:1.25fr 1fr}}
.book{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.book h3{font-size:17px;font-weight:800;margin-bottom:2px}
.book .en{font-size:12px;color:var(--ink3);letter-spacing:.5px;margin-bottom:6px}
.book p{font-size:14px;color:var(--ink2)}
.book.main{display:grid;grid-template-columns:150px 1fr;gap:20px;align-items:start;transition:border-color .2s}
.book.main:hover{border-color:rgba(36,227,191,.45)}
.book.main img{border-radius:10px;box-shadow:0 14px 30px rgba(0,0,0,.45);width:150px;height:auto}
.book.main h3{font-size:20px}
.book.main .more{display:inline-block;margin-top:8px;font-size:13.5px;font-weight:700;color:var(--ac)}
@media(max-width:520px){.book.main{grid-template-columns:110px 1fr;gap:14px}.book.main img{width:110px}}
.book-list{display:grid;gap:12px}
.strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:0 0 12px}
.strip img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:12px;border:1px solid var(--line)}
@media(max-width:640px){.strip{grid-template-columns:1fr 1fr}.strip img:nth-child(3){display:none}}

/* form */
.form{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:24px}
@media(min-width:700px){.form{padding:32px}}
.form label{display:block;font-size:13px;color:var(--ink2);margin:14px 0 6px;font-weight:600}
.form input,.form select,.form textarea{width:100%;padding:12px 14px;border-radius:12px;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.05);color:#fff;font-size:15px;font-family:inherit;outline:none}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--ac);box-shadow:0 0 0 3px rgba(36,227,191,.18)}
.form select option{color:#111}
.form textarea{min-height:96px;resize:vertical}
.form .hp{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}
.form .msg{margin-top:12px;font-size:14px;min-height:22px}
.form .msg.ok{color:var(--ac)}.form .msg.err{color:var(--warn)}
.contact{display:grid;gap:14px}
.contact .big{font-size:26px;font-weight:900;color:#fff;letter-spacing:1px}
.contact .big a{color:var(--ac)}
.qr{width:168px;height:168px;border-radius:14px;border:1px dashed rgba(255,255,255,.35);display:grid;place-items:center;text-align:center;font-size:12.5px;color:var(--ink3);padding:12px;background:rgba(255,255,255,.03)}

/* footer */
footer{padding:36px 0 28px;border-top:1px solid var(--line);font-size:13px;color:var(--ink3)}
footer .row{display:flex;flex-wrap:wrap;gap:8px 20px;margin-bottom:10px}
footer a:hover{color:#fff}
.beian{all:initial;display:block;font-family:inherit;font-size:12px;color:#aab4c0;background:#071a1c;padding:10px 16px;text-align:center}
.beian a{color:#aab4c0}

/* sticky mobile CTA */
.stick{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;gap:10px;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:rgba(11,35,38,.94);backdrop-filter:blur(12px);border-top:1px solid var(--line)}
.stick .btn{flex:1;padding:12px 10px;font-size:14.5px}
@media(min-width:900px){.stick{display:none}}
body.has-stick{padding-bottom:72px}
@media(min-width:900px){body.has-stick{padding-bottom:0}}