/* 睿卷 Sagacia 品牌页样式（主站引导页 / 项目首页共用）。配色、字体、按钮与 hero 动效沿用 South Hills Academy（shacademy.org）的设计体系。 */
:root{--navy:#1b2a4d;--navy-2:#2c4070;--navy-3:#3a5288;--gold:#c9a227;--gold-2:#e3c054;--cream:#faf8f3;--paper:#fff;--ink:#1d2a38;--muted:#5d6b7c;--line:#e6e1d6;
--serif:'Playfair Display','Songti SC','Noto Serif SC','Source Han Serif SC',Georgia,serif;
--sans:'Inter','PingFang SC','Microsoft YaHei',-apple-system,'Helvetica Neue',sans-serif;
--radius:14px;--shadow:0 12px 40px rgba(13,36,64,.10);--shadow-lg:0 24px 70px rgba(13,36,64,.16)}
*{box-sizing:border-box}html,body{margin:0}
body{font-family:var(--sans);color:var(--ink);background:var(--cream);-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

/* 顶栏（叠在 hero 上） */
.topbar{position:absolute;top:0;left:0;right:0;z-index:5;color:#fff}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;padding-top:22px;padding-bottom:22px}
.brand{display:flex;align-items:center;gap:12px}
.brand .mark{width:46px;height:auto;display:block;flex:none}
.brand b{display:block;font-family:var(--serif);font-size:20px;letter-spacing:.08em;font-weight:600;line-height:1.2}
.brand small{display:block;font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;opacity:.75}
.nav{display:flex;align-items:center;gap:18px;font-size:14px}
.nav a.txt{opacity:.85}.nav a.txt:hover{opacity:1;color:var(--gold-2)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 28px;border-radius:999px;font-weight:600;font-size:14px;letter-spacing:.04em;transition:.3s ease;border:2px solid transparent;cursor:pointer;white-space:nowrap}
.btn-gold{background:var(--gold);color:var(--navy);position:relative;overflow:hidden}
.btn-gold:hover{background:#b8921e;transform:translateY(-2px);box-shadow:0 12px 30px rgba(201,162,39,.55)}
.btn-gold:after{content:"";position:absolute;top:0;left:-90%;width:45%;height:100%;background:linear-gradient(105deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-20deg);animation:sheen 5s ease-in-out infinite}
.btn-line{border-color:rgba(255,255,255,.75);color:#fff}.btn-line:hover{background:rgba(255,255,255,.14)}
.btn-navy{background:var(--navy);color:#fff}.btn-navy:hover{background:var(--navy-2);transform:translateY(-2px)}
.btn-sm{padding:9px 20px;font-size:13px}

/* hero：背景视频 + 深蓝遮罩；视频缺失时显示渐变底 */
.hero{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;color:#fff;overflow:hidden;background:var(--navy)}
.hero.short{min-height:82vh}
.hero .fallback{position:absolute;inset:-4%;background:radial-gradient(ellipse at 18% 28%,rgba(58,82,136,.95),transparent 60%),radial-gradient(ellipse at 82% 72%,rgba(201,162,39,.20),transparent 55%),linear-gradient(160deg,#1b2a4d,#0e1730);animation:kb 22s ease-in-out infinite alternate}
.hero video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity 1.2s ease}
.hero video.on{opacity:1}
.hero .veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(14,23,48,.62) 0%,rgba(14,23,48,.40) 38%,rgba(14,23,48,.82) 100%)}
.hero .inner{position:relative;z-index:2;width:100%;padding:128px 0 72px}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.28em;text-transform:uppercase;color:var(--gold-2)}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(38px,6vw,70px);line-height:1.14;margin:18px 0 0;letter-spacing:.02em}
.hero h1 .hl{display:block;overflow:hidden;padding-bottom:.08em}
.hero h1 .hl-in{display:inline-block;transform:translateY(112%);animation:hlup .8s cubic-bezier(.22,1,.36,1) forwards}
.hero h1 em{font-style:normal;color:var(--gold-2)}
.hero .en{font-family:var(--serif);font-style:italic;font-size:clamp(17px,1.9vw,22px);opacity:.92;margin:20px 0 0;max-width:760px;line-height:1.5}
.hero .ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.rise{animation:rise .9s cubic-bezier(.22,1,.36,1) both}
.d1{animation-delay:.15s}.d2{animation-delay:.3s}.d3{animation-delay:.45s}.d4{animation-delay:.6s}

/* 引导页：左右两个入口 */
.choices{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:52px;max-width:1000px}
.choice{position:relative;display:block;padding:32px 32px 28px;border-radius:20px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.24);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);transition:.35s cubic-bezier(.22,1,.36,1)}
.choice:hover{transform:translateY(-5px);border-color:var(--gold);background:rgba(255,255,255,.14);box-shadow:0 26px 60px rgba(0,0,0,.35)}
.choice .k{font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold-2);font-weight:600}
.choice .t{font-family:var(--serif);font-size:clamp(28px,3.2vw,40px);margin:12px 0 2px;font-weight:600;line-height:1.2}
.choice .te{font-family:var(--serif);font-style:italic;opacity:.88;font-size:18px}
.choice .d{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.18);font-size:13.5px;opacity:.85;line-height:1.7}
.choice .go{position:absolute;right:28px;top:30px;width:48px;height:48px;border-radius:50%;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-size:22px;font-weight:700;transition:.35s}
.choice:hover .go{transform:translateX(5px);background:var(--gold-2)}

/* 授权条（AP） */
.partner{display:inline-flex;align-items:center;gap:12px;margin-top:26px;padding:12px 20px 12px 14px;border-radius:999px;background:rgba(201,162,39,.16);border:1px solid rgba(227,192,84,.65);font-size:14px;font-weight:600;letter-spacing:.02em}
.partner .seal{width:30px;height:30px;border-radius:50%;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-size:15px;flex:none}
.partner span small{display:block;font-weight:400;font-size:12px;opacity:.85;font-style:italic;font-family:var(--serif);letter-spacing:0}

/* 浅色内容区 */
.sec{padding:92px 0}
.sec.alt{background:var(--paper)}
.sec h2{font-family:var(--serif);font-weight:600;font-size:clamp(28px,3.6vw,42px);line-height:1.2;margin:12px 0 6px;color:var(--navy)}
.sec .lead{color:var(--muted);font-size:16px;max-width:720px;margin:6px 0 0}
.sec .lead i{font-family:var(--serif)}
.feat{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.3s}
.sec.alt .card{background:var(--cream)}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card .no{font-family:var(--serif);color:var(--gold);font-size:30px;line-height:1}
.card h3{font-family:var(--serif);color:var(--navy);font-size:21px;margin:14px 0 2px}
.card .h3e{font-family:var(--serif);font-style:italic;color:var(--muted);font-size:14px}
.card p{color:var(--muted);font-size:14.5px;margin:12px 0 0}
.track{margin-top:34px}
.track h3{font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold);margin:0 0 12px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{display:inline-flex;align-items:baseline;gap:8px;padding:10px 16px;border-radius:999px;background:var(--paper);border:1px solid var(--line);font-size:14px;color:var(--navy)}
.chip small{color:var(--muted);font-size:12px}
.note{margin-top:28px;padding:22px 26px;border-left:3px solid var(--gold);background:var(--paper);border-radius:0 var(--radius) var(--radius) 0;color:var(--muted);font-size:14.5px}
.note b{color:var(--navy)}
.cta-band{background:var(--navy);color:#fff;text-align:center;padding:76px 0}
.cta-band h2{color:#fff}
.cta-band .lead{color:rgba(255,255,255,.78);margin:8px auto 0}

/* 页脚 */
.foot{background:#121d38;color:rgba(255,255,255,.66);font-size:12.5px;padding:24px 0;text-align:center;line-height:2}
.foot a:hover{color:var(--gold-2)}
.foot .sep{margin:0 10px;opacity:.4}
.hero .foot-in{position:absolute;left:0;right:0;bottom:0;z-index:2;background:transparent;padding:16px 0}

@keyframes hlup{to{transform:none}}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@keyframes kb{from{transform:scale(1)}to{transform:scale(1.08) translate(-1%,-1%)}}
@keyframes sheen{0%,60%{left:-90%}100%{left:160%}}
@media(max-width:860px){.feat{grid-template-columns:1fr}}
@media(max-width:760px){.wrap{padding:0 18px}.choices{grid-template-columns:1fr;gap:16px;margin-top:36px}.choice{padding:24px 22px 22px}.choice .go{right:20px;top:22px;width:42px;height:42px}
  .hero .inner{padding:108px 0 40px}.hero h1{font-size:28px}.hero .en{font-size:16px}.brand small{letter-spacing:.14em}.nav a.txt{display:none}.sec{padding:64px 0}.partner{border-radius:16px}.hero .foot-in{position:static;padding:22px 0 18px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.hero h1 .hl-in{transform:none}}