:root{--bg:#f6f4ef;--card:#fff;--card2:#faf9f5;--ink:#16181d;--mute:#6a6f7a;--faint:#9a9ea7;--line:#e3e0d8;--acc:#1f5eff;--ok:#178a4c;--warn:#b7791f;--no:#c4473a;--chip:#eceae3;--shade:rgba(20,22,28,.6)}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#111317;--card:#1a1d23;--card2:#16191e;--ink:#eceef2;--mute:#9aa0ab;--faint:#6d727c;--line:#2a2e36;--acc:#6f97ff;--ok:#3cc47c;--warn:#e0a84a;--no:#ff7a6b;--chip:#232831;--shade:rgba(0,0,0,.75)}}
:root[data-theme=dark]{--bg:#111317;--card:#1a1d23;--card2:#16191e;--ink:#eceef2;--mute:#9aa0ab;--faint:#6d727c;--line:#2a2e36;--acc:#6f97ff;--ok:#3cc47c;--warn:#e0a84a;--no:#ff7a6b;--chip:#232831;--shade:rgba(0,0,0,.75)}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 "Noto Sans SC",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
body.lock{overflow:hidden}
a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
button,input{font:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
header{border-bottom:1px solid var(--line);background:var(--card);position:sticky;top:0;z-index:5}
header .wrap{display:flex;align-items:center;gap:20px;min-height:56px;flex-wrap:wrap}
.logo{font:700 22px "Barlow Condensed",sans-serif;letter-spacing:.5px;color:var(--ink)}.logo b{color:var(--acc)}.logo:hover{text-decoration:none}
nav{display:flex;gap:16px;font-size:14px;flex-wrap:wrap}nav a{color:var(--mute);white-space:nowrap}nav a.on{color:var(--ink);font-weight:700}
.hero{padding:40px 0 8px}
h1{font-size:clamp(26px,4.6vw,40px);line-height:1.25;margin:0 0 12px;font-weight:900}
.thesis{font-size:clamp(17px,2.4vw,21px);font-weight:700;line-height:1.5;margin:0 0 10px;max-width:900px}
.lead{color:var(--mute);margin:0 0 6px;font-size:14px;max-width:860px}
.meta{color:var(--faint);font-size:12.5px;margin:6px 0 0}
.bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:22px 0 6px}
#q{height:38px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink);padding:0 12px;outline:none;width:320px;max-width:100%}
#q:focus{border-color:var(--acc)}
.shown{color:var(--faint);font-size:12.5px;margin-left:auto}
.chip{font:500 13px "Noto Sans SC";padding:4px 12px;border-radius:99px;border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer}
.chip.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
h2.grp{font-size:20px;margin:34px 0 10px;font-weight:900}
.qa{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:0 0 10px;scroll-margin-top:72px}
.qa summary{list-style:none;cursor:pointer;padding:14px 16px;font-size:16px;font-weight:700;line-height:1.5;display:flex;gap:12px;align-items:baseline;border-radius:12px}
.qa summary::-webkit-details-marker{display:none}
.qa summary::before{content:"+";color:var(--mute);font-weight:400;width:14px;flex:none}
.qa[open] summary::before{content:"\2212"}
.qa summary:hover{background:var(--card2)}
.qa .body{padding:0 16px 16px 42px;display:grid;gap:12px}
.qa .ans{margin:0;font-size:14.5px;line-height:1.85}
.vids{display:flex;flex-wrap:wrap;gap:10px}
.vchip{display:grid;grid-template-columns:48px minmax(0,1fr);gap:10px;align-items:center;width:340px;max-width:100%;border:1px solid var(--line);border-radius:10px;padding:6px;background:var(--card2);color:var(--ink);cursor:pointer;text-align:left}
.vchip:hover{border-color:var(--acc)}
.vchip img{width:48px;height:64px;object-fit:cover;border-radius:6px;display:block;background:var(--chip)}
.vchip b{display:block;font-size:13px;line-height:1.45}
.vchip small{color:var(--faint);font-size:11.5px}
.src{font-size:12px;color:var(--faint)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.vc{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;scroll-margin-top:72px}
.vc .pl{position:relative;aspect-ratio:3/4;background:var(--chip);cursor:pointer;border:0;padding:0;display:block;width:100%}
.vc .pl img{width:100%;height:100%;object-fit:cover;display:block}
.vc .pl::after{content:"";position:absolute;left:50%;top:50%;width:54px;height:54px;margin:-27px 0 0 -27px;border-radius:50%;background:rgba(0,0,0,.55) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M8 5v14l11-7z' fill='%23fff'/%3E%3C/svg%3E") center/26px no-repeat}
.vc .du{position:absolute;right:8px;bottom:8px;background:rgba(0,0,0,.65);color:#fff;font-size:12px;padding:1px 7px;border-radius:6px}
.vc .tx{padding:12px 14px 14px;display:grid;gap:6px}
.vc h3{margin:0;font-size:15px;line-height:1.45}
.vc p{margin:0;font-size:13px;color:var(--mute);line-height:1.65}
.vc .links{font-size:12.5px;display:flex;gap:12px;flex-wrap:wrap}
.tag{display:inline-block;font-size:11.5px;padding:1px 8px;border-radius:99px;background:var(--chip);color:var(--mute)}
.modal{position:fixed;inset:0;background:var(--shade);z-index:20;display:flex;align-items:center;justify-content:center;padding:16px}
.modal .box{position:relative;max-width:min(92vw,520px);width:100%}
.modal video{width:100%;max-height:84vh;border-radius:12px;background:#000;display:block}
.modal .cap{color:#fff;font-size:14px;margin:10px 0 0;text-align:center}
.modal .x{position:absolute;top:-40px;right:0;background:none;border:0;color:#fff;font-size:28px;cursor:pointer;line-height:1}
.foot{margin:40px 0 60px;color:var(--faint);font-size:12.5px;border-top:1px solid var(--line);padding-top:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.pill{display:inline-block;font-size:12px;font-weight:700;padding:2px 9px;border-radius:99px;border:1px solid currentColor;white-space:nowrap}
.pill.ok{color:var(--ok)}.pill.warn{color:var(--warn)}.pill.no{color:var(--faint)}.pill.acc{color:var(--acc)}
@media (max-width:640px){.qa .body{padding-left:16px}.vchip{width:100%}#q{width:100%}.shown{margin-left:0}.hero{padding-top:26px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}