/* =========================================================
   學海無涯 · AI世界後 還是學海無涯 — styles
   Kessler system (void / cyan) + 學海無涯 gold, CJK typography.
   ========================================================= */

:root{
  --void:#06070B;
  --deep:#0B0F1A;
  --panel:#0F1526;
  --panel-2:#141C33;
  --line:rgba(238,242,255,.1);
  --line-2:rgba(238,242,255,.18);
  --text:#EEF2FF;
  --muted:rgba(238,242,255,.66);
  --dim:rgba(238,242,255,.42);
  --blue:#4F7BFF;
  --cyan:#6EE7F9;
  --gold:#E8C27A;
  --gold-2:#F3D9A4;
  --violet:#8B7CFF;
  --ok:#7EE0A0;
  --display:'Space Grotesk','Noto Sans TC',system-ui,-apple-system,'Segoe UI','PingFang TC','Microsoft JhengHei',sans-serif;
  --body:'Noto Sans TC','Space Grotesk',system-ui,-apple-system,'Segoe UI','PingFang TC','Microsoft JhengHei',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.16,1,.3,1);
  --gutter:clamp(20px,5vw,80px);
  --noise:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{overflow-x:clip;scroll-behavior:auto}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
.lenis.lenis-stopped{overflow:hidden}
html.is-locked{overflow:hidden}
body{font-family:var(--body);font-size:16px;line-height:1.7;color:var(--text);background:var(--void);overflow-x:clip;-webkit-font-smoothing:antialiased}
body::after{content:"";position:fixed;inset:0;z-index:9000;pointer-events:none;background-image:var(--noise);background-size:220px 220px;opacity:.05}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
svg{display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.mono{font-family:var(--mono);font-weight:400;letter-spacing:.12em;text-transform:uppercase}
.wrap{width:min(1400px,100% - var(--gutter)*2);margin-inline:auto}
.wrap-read{width:min(760px,100% - var(--gutter)*2);margin-inline:auto}
.index{display:inline-block;font-size:11px;color:var(--dim);margin-bottom:22px}
.h2{font-family:var(--display);font-size:clamp(30px,4.4vw,64px);font-weight:600;letter-spacing:-.02em;line-height:1.12;max-width:20ch}
.h2 em,.hero-h em{font-style:normal;color:var(--gold)}
h1,h2,h3,p,li,td,th,blockquote{overflow-wrap:anywhere}
.lede-s{color:var(--muted);font-size:clamp(15px,1.15vw,18px);line-height:1.8;max-width:56ch;margin-top:18px}

/* ---------- fixed background layers ---------- */
.bg{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-aurora{position:absolute;inset:-30%;
  background:radial-gradient(40% 35% at 20% 30%,rgba(79,123,255,.18),transparent 70%),radial-gradient(35% 30% at 80% 70%,rgba(139,124,255,.13),transparent 70%),radial-gradient(30% 25% at 60% 20%,rgba(232,194,122,.07),transparent 70%);
  animation:aurora 30s ease-in-out infinite alternate;will-change:transform}
@keyframes aurora{from{transform:translate(0,0) rotate(0deg)}to{transform:translate(-4%,3%) rotate(6deg)}}
.bg-grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:96px 96px;opacity:.35;
  -webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 10%,transparent 75%);mask-image:radial-gradient(ellipse at 50% 30%,#000 10%,transparent 75%)}
.bg-vignette{position:absolute;inset:0;background:radial-gradient(ellipse at 50% 50%,transparent 55%,rgba(6,7,11,.8) 100%)}
main,.footer{position:relative;z-index:1}

/* ---------- reveal states ---------- */
[data-reveal]{opacity:0;transform:translateY(24px)}
[data-chars]{visibility:hidden}
[data-chars].is-split{visibility:visible}
[data-wipe]{clip-path:inset(0 100% 0 0)}
.no-motion [data-wipe]{clip-path:none}
.wd{display:inline-block;white-space:nowrap}
.ch{display:inline-block;will-change:transform,opacity}
.no-motion [data-reveal]{opacity:1;transform:none}
.no-motion [data-chars]{visibility:visible}
.page-lesson [data-reveal]{transition:opacity 1s var(--ease),transform 1s var(--ease)}
.page-lesson [data-reveal].is-in{opacity:1;transform:none}

/* ---------- loader ---------- */
.loader{position:fixed;inset:0;z-index:10000;background:var(--void);display:flex;align-items:center;justify-content:center;clip-path:inset(0 0 0 0)}
.loader-box{width:min(440px,80vw)}
.loader-row{display:flex;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:12px}
.loader-bar{height:1px;background:var(--line);position:relative;overflow:hidden}
.loader-bar i{position:absolute;inset:0;background:var(--cyan);transform:scaleX(0);transform-origin:left}
.loader-log{margin-top:22px;font-size:11px;color:var(--dim);display:grid;gap:7px;letter-spacing:.06em;text-transform:none}
.loader-log li{opacity:0;transform:translateY(6px)}
.loader-log li::before{content:"› ";color:var(--cyan)}
.loader-corner{position:absolute;font-size:10px;color:var(--dim)}
.loader-corner.tl{left:28px;top:24px}
.loader-corner.br{right:28px;bottom:24px}
.loader.is-done{display:none}

/* ---------- cursor ---------- */
.cursor{position:fixed;left:0;top:0;z-index:9500;pointer-events:none;opacity:0;transition:opacity .3s}
.cursor.is-on{opacity:1}
.c-dot,.c-ring{position:absolute;left:0;top:0;border-radius:50%;transform:translate(-50%,-50%)}
.c-dot{width:4px;height:4px;background:var(--cyan)}
.c-ring{width:30px;height:30px;border:1px solid rgba(110,231,249,.55);transition:width .35s var(--ease),height .35s var(--ease),border-color .3s}
.c-ring::before,.c-ring::after{content:"";position:absolute;left:50%;top:50%;background:rgba(110,231,249,.55);transform:translate(-50%,-50%)}
.c-ring::before{width:8px;height:1px}.c-ring::after{width:1px;height:8px}
.cursor.is-hover .c-ring{width:58px;height:58px;border-color:var(--cyan)}
@media (hover:none){.cursor{display:none}}

/* ---------- nav ---------- */
.nav{position:fixed;left:0;right:0;top:0;z-index:900;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:16px var(--gutter);transform:translateY(-120%);transition:transform 1s var(--ease) .1s}
.nav.is-ready{transform:none}
.nav-brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:600;letter-spacing:-.01em;font-size:17px}
.nav-brand small{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--dim);font-weight:400;margin-left:6px}
.nav-pill{display:flex;gap:4px;padding:5px;border-radius:999px;background:rgba(15,21,38,.55);border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:background .5s,box-shadow .5s}
.nav.is-scrolled .nav-pill{background:rgba(15,21,38,.88);box-shadow:0 20px 50px -20px rgba(0,0,0,.8)}
.nav-pill a{padding:9px 15px;border-radius:999px;font-size:13px;color:var(--muted);transition:color .3s,background .3s;white-space:nowrap}
.nav-pill a:hover{color:var(--text);background:rgba(238,242,255,.06)}
.nav-right{display:flex;justify-content:flex-end;align-items:center;gap:16px}
.nav-mid{font-size:10px;color:var(--dim);text-align:center}
.nav-status{font-size:10px;color:var(--dim);display:flex;align-items:center;gap:8px;transition:opacity .4s}
.nav-status i{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 2.2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.nav.is-scrolled .nav-status{opacity:0}
.nav--lite{background:linear-gradient(180deg,rgba(6,7,11,.92),rgba(6,7,11,0));padding:14px var(--gutter)}
@media (max-width:900px){
  .nav{grid-template-columns:1fr auto}
  .nav-pill,.nav-status,.nav-mid{display:none}
  .nav-brand small{display:none}
}

/* ---------- buttons ---------- */
.btn-k{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 20px;border-radius:12px;border:1px solid var(--line-2);font-size:14px;font-weight:500;color:var(--text);background:rgba(238,242,255,.03);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);overflow:hidden;transition:border-color .4s,box-shadow .5s,background .4s,opacity .3s;will-change:transform;white-space:nowrap}
.btn-k span{position:relative;z-index:2;display:inline-block}
.btn-k::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(110,231,249,.18),rgba(79,123,255,.18));opacity:0;transition:opacity .4s}
.btn-k:hover{border-color:rgba(110,231,249,.6);box-shadow:0 0 0 1px rgba(110,231,249,.2),0 16px 40px -14px rgba(110,231,249,.5)}
.btn-k:hover::before{opacity:1}
.btn-k--solid{background:var(--text);color:var(--void);border-color:var(--text)}
.btn-k--solid::before{background:linear-gradient(90deg,var(--cyan),#fff)}
.btn-k--gold{background:var(--gold);color:var(--void);border-color:var(--gold)}
.btn-k--gold::before{background:linear-gradient(90deg,var(--gold-2),#fff)}
.btn-k--lg{padding:18px 30px;font-size:16px;border-radius:14px}
.btn-k:disabled{opacity:.7;cursor:default;box-shadow:none}

/* ---------- hero ---------- */
.hero{position:relative;height:100vh;height:100svh;min-height:700px;overflow:hidden;display:flex;align-items:center;justify-content:center;text-align:center;perspective:1200px}
.stars{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.hero-orbit{position:absolute;left:50%;top:52%;width:min(130vw,1500px);aspect-ratio:1;transform:translate(-50%,-50%);z-index:1;opacity:.9;will-change:transform}
.hero-orbit svg{width:100%;height:100%}
.hero-glow{position:absolute;left:50%;bottom:-10%;width:120vw;height:60vh;transform:translateX(-50%);background:radial-gradient(ellipse at 50% 100%,rgba(79,123,255,.35),rgba(79,123,255,0) 60%);z-index:1;pointer-events:none}
.hero-planet{position:absolute;left:50%;bottom:-150vw;width:180vw;aspect-ratio:1;border-radius:50%;transform:translateX(-50%);z-index:2;background:radial-gradient(circle at 50% 0%,#141F47 0%,#0A0F22 18%,#06070B 42%);box-shadow:0 -1px 0 rgba(232,194,122,.7),0 -30px 80px -10px rgba(79,123,255,.45),0 -2px 30px rgba(232,194,122,.3)}
@media (min-width:900px){.hero-planet{bottom:-165vw}}
.hero-inner{position:relative;z-index:4;max-width:1040px;padding:0 var(--gutter)}
.eyebrow{font-size:11px;color:var(--cyan);margin-bottom:26px}
.hero-h{font-family:var(--display);font-size:clamp(40px,6.8vw,104px);font-weight:600;letter-spacing:-.03em;line-height:1.08;margin-bottom:26px}
.hero-h .ch{transform-origin:50% 100%}
.hero-p{font-size:clamp(15px,1.25vw,19px);color:var(--muted);max-width:44em;margin:0 auto 36px;line-height:1.85}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hud{position:absolute;z-index:5;display:flex;flex-direction:column;gap:4px;padding:14px 16px;border-radius:14px;text-align:left;min-width:170px;background:rgba(15,21,38,.55);border:1px solid var(--line);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 30px 60px -30px rgba(0,0,0,.9)}
.hud span{font-size:10px;color:var(--dim)}
.hud b{font-family:var(--display);font-weight:500;font-size:24px;letter-spacing:-.02em;line-height:1.1}
.hud b small{font-size:14px;color:var(--dim);font-weight:400}
.hud em{font-style:normal;font-size:10px;color:var(--cyan);letter-spacing:.08em;text-transform:none}
.hud--1{left:7%;top:26%}.hud--2{right:8%;top:22%}.hud--3{right:12%;bottom:24%}
.hero-scroll{position:absolute;left:50%;bottom:30px;transform:translateX(-50%);z-index:5;font-size:10px;color:var(--dim);display:flex;flex-direction:column;align-items:center;gap:10px;white-space:nowrap}
.hero-scroll i{width:1px;height:42px;background:var(--line-2);position:relative;overflow:hidden}
.hero-scroll i::after{content:"";position:absolute;inset:0;background:var(--cyan);transform:translateY(-100%);animation:drop 1.8s var(--ease) infinite}
@keyframes drop{to{transform:translateY(100%)}}
@media (max-width:900px){
  .hud--1{left:4%;top:9%;min-width:0;padding:10px 12px}.hud--2{right:4%;top:9%;min-width:0;padding:10px 12px}.hud--3{display:none}
  .hud b{font-size:20px}
  .hero{min-height:660px}
  .hero-inner{padding-top:70px}
}

/* ---------- ticker ---------- */
.ticker{position:relative;z-index:2;overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px 0;font-size:11px;color:var(--muted);background:rgba(6,7,11,.6);backdrop-filter:blur(6px)}
.ticker-track{display:flex;gap:48px;width:max-content;will-change:transform}
.ticker-track span{white-space:nowrap;display:inline-flex;gap:12px;align-items:center;letter-spacing:.1em}
.ticker-track span::before{content:"◆";color:var(--gold);font-size:8px}

/* ---------- tier / lesson grid ---------- */
.tier{position:relative;padding:16vh 0 10vh}
.tier-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;flex-wrap:wrap;margin-bottom:40px}
.tier-tag{display:inline-flex;align-items:center;gap:8px;font-size:10px;color:var(--cyan);border:1px solid rgba(110,231,249,.35);border-radius:999px;padding:6px 12px;margin-left:14px;vertical-align:middle}
.tier-tag i{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.tier-tag--gold{color:var(--gold);border-color:rgba(232,194,122,.4)}
.tier-tag--gold i{background:var(--gold);box-shadow:0 0 10px var(--gold)}
.rail-wrap{min-width:min(320px,100%)}
.rail-label{font-size:10px;color:var(--dim);display:flex;justify-content:space-between;margin-bottom:10px}
.rail{height:2px;background:var(--line);position:relative;overflow:hidden;border-radius:2px}
.rail i{position:absolute;inset:0;background:linear-gradient(90deg,var(--cyan),var(--gold));transform:scaleX(0);transform-origin:left;transition:transform 1.2s var(--ease)}
.lgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;perspective:1400px}
.lgrid--2{grid-template-columns:repeat(2,1fr)}
.lgrid--4{grid-template-columns:repeat(4,1fr)}
.lcard{position:relative;display:flex;flex-direction:column;gap:12px;min-height:250px;padding:26px 26px 22px;border-radius:20px;overflow:hidden;background:linear-gradient(180deg,rgba(238,242,255,.045),rgba(238,242,255,.015));border:1px solid var(--line);transition:border-color .5s,transform .6s var(--ease);will-change:transform}
.lcard-top{display:flex;justify-content:space-between;font-size:10px;color:var(--dim)}
.lcard h3{font-family:var(--display);font-size:clamp(18px,1.4vw,21px);font-weight:600;letter-spacing:-.01em;line-height:1.35}
.lcard-sum{color:var(--muted);font-size:14px;line-height:1.75;flex:1}
.lcard-status{display:flex;align-items:center;gap:10px;font-size:12px;padding-top:14px;border-top:1px solid var(--line)}
.lcard-status i{font-style:normal;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:11px;border:1px solid var(--line-2)}
.lcard-glow{position:absolute;inset:-1px;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(110,231,249,.16),transparent 60%);opacity:0;transition:opacity .5s;pointer-events:none}
.lcard.is-open{border-color:rgba(110,231,249,.35);box-shadow:0 0 0 1px rgba(110,231,249,.08),0 30px 80px -40px rgba(110,231,249,.35)}
.lcard.is-open .lcard-status{color:var(--cyan)}
.lcard.is-open .lcard-status i{background:var(--cyan);color:var(--void);border-color:var(--cyan);box-shadow:0 0 16px rgba(110,231,249,.6)}
.lcard.is-open:hover{border-color:rgba(110,231,249,.7);transform:translateY(-4px)}
.lcard.is-open:hover .lcard-glow{opacity:1}
.lcard.is-done .lcard-status{color:var(--ok)}
.lcard.is-done .lcard-status i{border-color:var(--ok);color:var(--ok)}
.lcard.is-done:hover{border-color:rgba(126,224,160,.5)}
.lcard.is-locked{cursor:not-allowed}
.lcard.is-locked h3,.lcard.is-locked .lcard-sum{opacity:.4;filter:blur(.4px)}
.lcard.is-locked .lcard-status{color:var(--dim)}
.lcard.is-locked::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(135deg,transparent 0 12px,rgba(238,242,255,.015) 12px 13px);pointer-events:none}
.tier-note{margin-top:22px;font-size:12px;color:var(--dim);display:flex;gap:10px;align-items:center}
.tier-note b{color:var(--gold);font-weight:500}
@media (max-width:1000px){.lgrid,.lgrid--4{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.lgrid,.lgrid--2,.lgrid--4{grid-template-columns:1fr}.lcard{min-height:0}}

/* ---------- member cards ---------- */
.mgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.mcard{position:relative;padding:32px;border-radius:22px;overflow:hidden;background:linear-gradient(160deg,rgba(20,28,51,.85),rgba(11,15,26,.9));border:1px solid var(--line-2);display:flex;flex-direction:column;gap:16px;min-height:340px}
.mcard::before{content:"";position:absolute;inset:0;background:radial-gradient(60% 60% at 90% 0%,rgba(232,194,122,.16),transparent 70%);pointer-events:none}
.mcard > *{position:relative}
.mcard-k{display:flex;justify-content:space-between;font-size:10px;color:var(--dim)}
.mcard h3{font-family:var(--display);font-size:clamp(24px,2.4vw,34px);font-weight:600;letter-spacing:-.02em;line-height:1.2}
.mcard p{color:var(--muted);font-size:15px;line-height:1.8}
.mcard-list{display:grid;gap:6px;font-size:12px;color:var(--muted)}
.mcard-list li{display:flex;gap:10px;align-items:baseline}
.mcard-list li::before{content:attr(data-n);font-family:var(--mono);font-size:10px;color:var(--gold);min-width:18px}
.mcard-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding-top:18px;border-top:1px solid var(--line)}
.mcard .rail-wrap{min-width:0;flex:1}
.gate-note{margin-top:22px;padding:16px 18px;border-radius:14px;border:1px dashed var(--line-2);font-size:12px;color:var(--dim);display:flex;gap:12px;align-items:flex-start;line-height:1.7}
.gate-note b{color:var(--text);font-weight:500}
@media (max-width:900px){.mgrid{grid-template-columns:1fr}}

/* ---------- org constellation (network) ---------- */
.network{position:relative}
.network-pin{height:100vh;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:clamp(20px,4vw,60px);padding:0 var(--gutter);overflow:hidden}
.network-vis{position:relative;height:min(82vh,820px);display:flex;align-items:center;justify-content:center}
.net-svg{height:100%;width:auto;max-width:100%;overflow:visible}
.net-orbit{stroke-dasharray:1;stroke-dashoffset:1}
.net-node{fill:var(--cyan)}
.net-halo{fill:rgba(110,231,249,.18)}
.net-links line{opacity:0}
.net-beam{opacity:0}
.net-ping{opacity:0;transform-origin:400px 400px}
.net-label{opacity:0;font-family:var(--body);font-size:13px;fill:rgba(238,242,255,.85)}
.net-center-label{font-family:var(--display);font-weight:600;font-size:18px;fill:#fff;text-anchor:middle}
.net-center-sub{font-family:var(--mono);font-size:9px;letter-spacing:2px;fill:rgba(238,242,255,.55);text-anchor:middle}
.net-readout{position:absolute;left:0;bottom:6%;display:flex;flex-direction:column;gap:6px;font-size:10px;color:var(--dim)}
.net-readout b{font-family:var(--display);font-weight:500;font-size:34px;letter-spacing:-.03em;color:var(--text);line-height:1;font-variant-numeric:tabular-nums}
.steps{position:relative;min-height:380px}
.step{position:absolute;inset:0;opacity:0;transform:translateY(34px);pointer-events:none;transition:opacity .9s var(--ease),transform .9s var(--ease)}
.step.is-active{opacity:1;transform:none;pointer-events:auto}
.step-k{display:block;font-size:11px;color:var(--cyan);margin-bottom:18px}
.step h2{font-family:var(--display);font-size:clamp(28px,3vw,46px);font-weight:600;letter-spacing:-.02em;line-height:1.2;margin-bottom:20px}
.step p{color:var(--muted);font-size:clamp(15px,1.1vw,17px);line-height:1.85;max-width:44em}
.step-dots{display:flex;gap:8px;margin-top:20px}
.step-dots i{width:48px;height:2px;background:var(--line);position:relative;overflow:hidden}
.step-dots i::after{content:"";position:absolute;inset:0;background:var(--cyan);transform:scaleX(var(--p,0));transform-origin:left}
@media (max-width:900px){
  .network-pin{grid-template-columns:1fr;grid-template-rows:44vh auto;align-content:center;gap:10px;padding-top:70px}
  .network-vis{height:100%}.net-readout{display:none}.steps{min-height:320px}
}

/* ---------- functions (tilt cards) ---------- */
.caps{padding:14vh 0 10vh}
.caps-head{margin-bottom:7vh}
.caps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;perspective:1400px}
.cap{position:relative;min-height:300px;padding:30px 28px 26px;border-radius:20px;display:flex;flex-direction:column;overflow:hidden;background:linear-gradient(180deg,rgba(238,242,255,.045),rgba(238,242,255,.015));border:1px solid var(--line);transform-style:preserve-3d;transition:border-color .5s;will-change:transform}
.cap:hover{border-color:rgba(232,194,122,.4)}
.cap-glow{position:absolute;inset:-1px;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(232,194,122,.14),transparent 60%);opacity:0;transition:opacity .5s;pointer-events:none}
.cap:hover .cap-glow{opacity:1}
.cap-icon{width:44px;height:44px;color:var(--cyan);margin-bottom:auto}
.cap-k{font-size:10px;color:var(--gold);margin-top:24px}
.cap h3{font-family:var(--display);font-size:clamp(20px,1.6vw,24px);font-weight:600;letter-spacing:-.01em;margin:8px 0 10px}
.cap p{color:var(--muted);font-size:14px;line-height:1.75}
.cap p b{color:var(--text);font-weight:500}
.cap-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}
.cap-tags span{font-family:var(--mono);font-size:9px;letter-spacing:.1em;color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:4px 8px}
@media (max-width:1000px){.caps-grid{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.caps-grid{grid-template-columns:1fr}.cap{min-height:0}.cap h3{font-size:18px}}

/* ---------- fly-through (四個瓶頸) ---------- */
.fly{position:relative}
.fly-pin{position:relative;height:100vh;overflow:hidden;perspective:1100px;perspective-origin:50% 48%}
.fly-head{position:absolute;left:0;right:0;top:100px;z-index:6;display:flex;justify-content:space-between;align-items:flex-start;gap:30px;flex-wrap:wrap}
.fly-sub{color:var(--muted);font-size:14px;max-width:34em;line-height:1.7}
.fly-stage{position:absolute;inset:0;transform-style:preserve-3d}
.plane{position:absolute;left:50%;top:52%;width:min(580px,86vw);padding:32px 34px 30px;border-radius:22px;background:linear-gradient(160deg,rgba(20,28,51,.94),rgba(11,15,26,.96));border:1px solid var(--line-2);box-shadow:0 50px 120px -40px rgba(0,0,0,.9),inset 0 0 0 1px rgba(110,231,249,.06);backface-visibility:hidden;will-change:transform,opacity}
.plane::before{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(60% 60% at 80% 0%,rgba(79,123,255,.25),transparent 70%);pointer-events:none}
.plane-k{display:block;font-size:10px;color:var(--gold);margin-bottom:12px}
.plane h3{font-family:var(--display);font-size:clamp(24px,2.4vw,36px);font-weight:600;letter-spacing:-.02em;line-height:1.15;margin-bottom:12px}
.plane p{color:var(--muted);font-size:15px;line-height:1.8}
.plane-fix{margin-top:16px;padding:12px 14px;border-radius:10px;background:rgba(110,231,249,.06);border:1px solid rgba(110,231,249,.18);font-size:13px;line-height:1.7}
.plane-fix b{display:block;font-family:var(--mono);font-size:9px;letter-spacing:.14em;color:var(--cyan);margin-bottom:4px;font-weight:400}
.fly-track{position:absolute;left:50%;bottom:36px;transform:translateX(-50%);z-index:6;display:flex;align-items:center;gap:14px;font-size:10px;color:var(--dim);white-space:nowrap}
.fly-track i{width:min(360px,50vw);height:1px;background:var(--line-2);position:relative;display:block}
.fly-track b{position:absolute;left:0;top:-3px;width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}
@media (max-width:900px){.fly-head{top:80px}.plane{padding:24px}}

/* ---------- metrics ---------- */
.metrics{position:relative;padding:14vh 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;background:rgba(11,15,26,.5)}
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}
.metrics-grid li{padding-top:22px;border-top:1px solid var(--line-2)}
.m-k{display:block;font-size:10px;color:var(--dim)}
.m-v{display:block;font-family:var(--display);font-size:clamp(44px,5.6vw,92px);font-weight:600;letter-spacing:-.04em;line-height:1;margin:16px 0 12px;font-variant-numeric:tabular-nums;white-space:nowrap}
.m-v small{font-size:.42em;font-weight:500;letter-spacing:0;color:var(--gold)}
.m-d{display:block;color:var(--muted);font-size:14px}
.scanline{position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,rgba(110,231,249,.7),transparent);animation:scan 7s linear infinite;pointer-events:none}
@keyframes scan{from{top:0}to{top:100%}}
@media (max-width:900px){.metrics-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.metrics-grid{grid-template-columns:1fr}}

/* ---------- mentors ---------- */
.mentors{padding:12vh 0 6vh}
.mentor-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:40px}
.mentor{position:relative;padding:32px;border-radius:22px;border:1px solid var(--line);background:linear-gradient(180deg,rgba(238,242,255,.04),rgba(238,242,255,.01));display:grid;gap:14px}
.mentor-k{font-size:10px;color:var(--gold)}
.mentor h3{font-family:var(--display);font-size:clamp(24px,2.2vw,32px);font-weight:600;letter-spacing:-.02em}
.mentor h3 small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:4px;letter-spacing:0}
.mentor p{color:var(--muted);font-size:14px;line-height:1.8}
.mentor blockquote{font-family:var(--display);font-size:17px;line-height:1.5;color:var(--text);padding-left:14px;border-left:2px solid var(--gold)}
.mentor ul{display:grid;gap:6px;font-size:13px;color:var(--muted)}
.mentor ul li{padding-left:14px;position:relative}
.mentor ul li::before{content:"●";position:absolute;left:0;top:0;font-size:7px;color:var(--cyan);line-height:2.6}
@media (max-width:900px){.mentor-grid{grid-template-columns:1fr}}

/* ---------- timeline (課程結構) ---------- */
.missions{padding:14vh 0 12vh}
.missions-grid{display:grid;grid-template-columns:.9fr 1.4fr;gap:60px;align-items:start}
.year-sticky{position:sticky;top:26vh}
.year{display:block;font-family:var(--display);font-size:clamp(52px,8vw,132px);font-weight:600;letter-spacing:-.04em;line-height:1;background:linear-gradient(180deg,#fff,rgba(238,242,255,.3));-webkit-background-clip:text;background-clip:text;color:transparent}
.year-k{display:block;font-size:11px;color:var(--cyan);margin-top:16px}
.missions-list{position:relative;padding-left:44px}
.missions-line{position:absolute;left:0;top:0;bottom:0;width:1px;background:var(--line)}
.missions-line i{position:absolute;inset:0;background:linear-gradient(180deg,var(--cyan),var(--gold));transform:scaleY(0);transform-origin:top}
.mission{position:relative;padding:38px 0;border-bottom:1px solid var(--line)}
.mission::before{content:"";position:absolute;left:-48px;top:50px;width:9px;height:9px;border-radius:50%;background:var(--void);border:1px solid var(--line-2);transition:background .5s,box-shadow .5s}
.mission.is-on::before{background:var(--cyan);box-shadow:0 0 16px var(--cyan)}
.mission > span{font-size:10px;color:var(--dim)}
.mission h3{font-family:var(--display);font-size:clamp(22px,2.2vw,32px);font-weight:600;letter-spacing:-.02em;margin:10px 0 12px;line-height:1.25}
.mission p{color:var(--muted);max-width:44em;line-height:1.8;font-size:15px}
.mission-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.mission-tags span{font-family:var(--mono);font-size:9px;letter-spacing:.1em;color:var(--gold);border:1px solid rgba(232,194,122,.3);border-radius:999px;padding:4px 8px}
@media (max-width:900px){.missions-grid{grid-template-columns:1fr;gap:30px}.year-sticky{position:relative;top:auto}}

/* ---------- notion library chips ---------- */
.lib{margin-top:56px;padding-top:36px;border-top:1px solid var(--line)}
.lib-head{display:flex;justify-content:space-between;align-items:baseline;gap:20px;flex-wrap:wrap;margin-bottom:18px}
.lib-head h3{font-family:var(--display);font-size:20px;font-weight:600}
.lib-head span{font-size:10px;color:var(--dim)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{display:inline-flex;align-items:center;gap:8px;padding:9px 14px;border-radius:999px;border:1px solid var(--line);font-size:13px;color:var(--muted);transition:border-color .3s,color .3s,background .3s}
.chips a::before{content:"↗";font-family:var(--mono);font-size:10px;color:var(--gold)}
.chips a:hover{color:var(--text);border-color:rgba(232,194,122,.5);background:rgba(232,194,122,.06)}

/* ---------- cta ---------- */
.cta{position:relative;padding:22vh 0;overflow:hidden;text-align:center}
.cta-beams{position:absolute;inset:0;pointer-events:none}
.cta-beams i{position:absolute;left:-10%;right:-10%;height:1px;background:linear-gradient(90deg,transparent,rgba(110,231,249,.45),transparent);transform:rotate(-7deg)}
.cta-beams i:nth-child(1){top:22%}.cta-beams i:nth-child(2){top:50%;opacity:.6}.cta-beams i:nth-child(3){top:78%;opacity:.4}
.cta-inner{position:relative;z-index:2}
.cta-h{font-family:var(--display);font-size:clamp(36px,6vw,96px);font-weight:600;letter-spacing:-.03em;line-height:1.1;max-width:16ch;margin:0 auto 24px;background:linear-gradient(90deg,#fff 10%,var(--cyan) 55%,var(--gold) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta p{color:var(--muted);max-width:46em;margin:0 auto 36px;font-size:clamp(15px,1.2vw,18px);line-height:1.8}
.cta-actions{display:flex;justify-content:center;align-items:center;gap:14px;flex-wrap:wrap}
.cta-note{display:block;margin-top:18px;font-size:10px;color:var(--dim)}

/* ---------- footer ---------- */
.footer{position:relative;padding:10vh 0 30px;overflow:hidden;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(6,7,11,0),rgba(11,15,26,.8))}
.footer-letters{display:flex;justify-content:space-between;padding:0 var(--gutter);font-family:var(--display);font-size:clamp(72px,18vw,260px);font-weight:700;line-height:.95;color:transparent;-webkit-text-stroke:1px rgba(238,242,255,.2);margin-bottom:12vh;user-select:none;pointer-events:none}
.footer-letters span{display:block;will-change:transform}
.footer-letters span:nth-child(odd){color:rgba(238,242,255,.05)}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;font-size:14px}
.footer-grid a{display:flex;align-items:center;gap:8px;color:var(--muted);padding:5px 0;transition:color .3s}
.footer-grid a:hover{color:var(--text)}
.f-k{display:block;color:var(--dim);font-size:10px;margin-bottom:12px}
.dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.footer-meta{display:flex;flex-direction:column;gap:8px;color:var(--dim);font-size:11px;text-align:right}
.footer-disclaimer{margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--dim);line-height:1.8;max-width:70em}
.footer-disclaimer b{color:var(--muted);font-weight:500}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}.footer-meta{text-align:left;grid-column:1/-1}}

/* =========================================================
   LESSON / COURSE PAGES
   ========================================================= */
.rprogress{position:fixed;left:0;right:0;top:0;height:2px;z-index:950;pointer-events:none}
.rprogress span{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--gold));transform:scaleX(0);transform-origin:left}

.course-hero{position:relative;padding:150px 0 50px;overflow:hidden}
.course-hero .h2{font-size:clamp(34px,5vw,72px)}
.course-hero-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:40px;align-items:end}
.course-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.course-stat{padding:16px 18px;border-radius:14px;border:1px solid var(--line);background:rgba(15,21,38,.5)}
.course-stat span{display:block;font-size:10px;color:var(--dim)}
.course-stat b{display:block;font-family:var(--display);font-size:26px;font-weight:600;letter-spacing:-.02em;margin-top:6px}
.course-body{padding:30px 0 12vh}
.course-back{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--dim);margin-bottom:30px}
.course-back:hover{color:var(--text)}
@media (max-width:900px){.course-hero-grid{grid-template-columns:1fr}.course-hero{padding-top:120px}}

.lesson{padding:150px 0 12vh}
.lesson-head{margin-bottom:54px}
.lesson-head h1{font-family:var(--display);font-size:clamp(30px,4.2vw,58px);font-weight:600;letter-spacing:-.025em;line-height:1.16;margin-bottom:22px}
.lede{font-size:clamp(16px,1.3vw,19px);color:var(--muted);line-height:1.85;padding-left:16px;border-left:2px solid var(--gold)}
.lede strong{color:var(--text);font-weight:500}
.lesson-meta{display:flex;gap:22px;flex-wrap:wrap;margin-top:24px;font-size:10px;color:var(--dim)}

.read{font-size:16.5px;line-height:1.95;color:rgba(238,242,255,.86)}
.read > * + *{margin-top:1.15em}
.read h2{font-family:var(--display);font-size:clamp(22px,2.2vw,30px);font-weight:600;letter-spacing:-.02em;line-height:1.3;color:var(--text);margin-top:2.4em;padding-top:1.2em;border-top:1px solid var(--line);counter-increment:h2}
.read h2::before{content:counter(h2,decimal-leading-zero);display:block;font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--cyan);margin-bottom:10px;font-weight:400}
.read h3{font-family:var(--display);font-size:19px;font-weight:600;color:var(--text);margin-top:1.8em}
.read p strong,.read li strong{color:var(--text);font-weight:600}
.read ul,.read ol{display:grid;gap:.5em;padding-left:1.4em}
.read ul li{list-style:none;position:relative}
.read ul li::before{content:"";position:absolute;left:-1.2em;top:.85em;width:6px;height:6px;border-radius:50%;background:var(--cyan);opacity:.8}
.read ol{counter-reset:ol}
.read ol li{list-style:none;position:relative;counter-increment:ol}
.read ol li::before{content:counter(ol) ".";position:absolute;left:-1.5em;top:0;font-family:var(--mono);font-size:12px;color:var(--gold)}
.read blockquote{padding:18px 22px;border-radius:14px;background:rgba(238,242,255,.03);border:1px solid var(--line);border-left:2px solid var(--gold);color:var(--text);font-size:15.5px;line-height:1.85}
.read blockquote small{display:block;margin-top:8px;font-size:12px;color:var(--dim)}
.read .callout{padding:20px 22px;border-radius:14px;background:rgba(110,231,249,.05);border:1px solid rgba(110,231,249,.2);font-size:15px;line-height:1.85}
.read .callout .t{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);margin-bottom:8px}
.read .callout--gold{background:rgba(232,194,122,.06);border-color:rgba(232,194,122,.28)}
.read .callout--gold .t{color:var(--gold)}
.read .callout--red{background:rgba(255,106,61,.06);border-color:rgba(255,106,61,.3)}
.read .callout--red .t{color:#FF8A66}
.read table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.6;display:block;overflow-x:auto}
.read thead,.read tbody{display:table;width:100%}
.read th,.read td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.read th{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);font-weight:400;border-bottom-color:var(--line-2)}
.read tr:hover td{background:rgba(238,242,255,.02)}
.read pre{padding:18px 20px;border-radius:14px;background:#0A0E19;border:1px solid var(--line);overflow-x:auto;font-family:var(--mono);font-size:12.5px;line-height:1.7;color:var(--gold-2);letter-spacing:0;text-transform:none}
.read code{font-family:var(--mono);font-size:.9em;padding:2px 6px;border-radius:6px;background:rgba(238,242,255,.06);color:var(--gold-2)}
.read pre code{padding:0;background:none}
.read figure{padding:18px;border-radius:14px;border:1px solid var(--line);background:#0A0E19}
.read figcaption{margin-top:10px;font-size:12px;color:var(--dim);line-height:1.6}
.read .prompt{position:relative;padding:22px 24px;border-radius:14px;background:linear-gradient(160deg,rgba(20,28,51,.9),rgba(11,15,26,.95));border:1px solid rgba(232,194,122,.35);font-size:15px;line-height:1.9;color:var(--text)}
.read .prompt::before{content:"PROMPT · 直接複製";position:absolute;right:16px;top:-9px;font-family:var(--mono);font-size:9px;letter-spacing:.18em;color:var(--gold);background:var(--void);padding:0 8px}
.read .kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}
.read .kv div{padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:rgba(238,242,255,.02)}
.read .kv b{display:block;font-family:var(--mono);font-size:9px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);margin-bottom:6px;font-weight:400}
.read .kv span{font-size:14px;line-height:1.6}
.read .steps-list{counter-reset:st;display:grid;gap:14px;padding:0}
.read .steps-list li{list-style:none;position:relative;padding:18px 20px 18px 62px;border-radius:14px;border:1px solid var(--line);background:rgba(238,242,255,.02)}
.read .steps-list li::before{content:counter(st,decimal-leading-zero);counter-increment:st;position:absolute;left:18px;top:18px;font-family:var(--display);font-size:22px;font-weight:600;color:var(--gold);width:auto;height:auto;background:none;border-radius:0}
.read .steps-list li b{display:block;color:var(--text);font-weight:600;margin-bottom:4px}
.read hr{border:0;height:1px;background:var(--line);margin-top:2em}

.complete-bar{margin-top:70px;padding:30px;border-radius:20px;border:1px solid var(--line-2);background:linear-gradient(160deg,rgba(20,28,51,.85),rgba(11,15,26,.9));display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}
.complete-bar .btn-k{min-width:min(100%,360px)}
.complete-note{font-size:10px;color:var(--dim)}
.lesson-nav{display:flex;justify-content:space-between;gap:14px;margin-top:30px}
.lesson-nav a{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:12px 16px;border-radius:12px;border:1px solid var(--line);transition:color .3s,border-color .3s}
.lesson-nav a:hover{color:var(--text);border-color:var(--line-2)}
.lesson-nav a.next.is-locked{opacity:.5;cursor:not-allowed}
.lesson-nav a.next.is-locked::before{content:"🔒 "}
.lesson-nav .spacer{flex:1}

.lock-overlay{position:fixed;inset:0;z-index:9800;background:rgba(6,7,11,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);display:flex;align-items:center;justify-content:center;padding:24px}
.lock-overlay[hidden]{display:none}
.lock-box{width:min(460px,100%);padding:40px 34px;border-radius:22px;border:1px solid var(--line-2);background:linear-gradient(160deg,rgba(20,28,51,.95),rgba(11,15,26,.98));text-align:center;display:grid;gap:14px;justify-items:center}
.lock-box .icon{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;border:1px solid rgba(232,194,122,.4);color:var(--gold);font-size:22px}
.lock-box h2{font-family:var(--display);font-size:26px;font-weight:600;letter-spacing:-.02em}
.lock-box p{color:var(--muted);font-size:14px;line-height:1.8}

.footer--lite{padding:8vh 0 26px}
.footer--lite .footer-grid{grid-template-columns:1fr auto}
@media (max-width:640px){.lesson{padding-top:120px}.footer--lite .footer-grid{grid-template-columns:1fr}.hero-h{font-size:34px}}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}