:root{--bg:#0a0f1c;--bg2:#111827;--card:rgba(255,255,255,.04);--border:rgba(148,163,184,.16);--text:#f1f5f9;--muted:#94a3b8;--faint:#64748b;--accent:#60a5fa;--accent2:#a78bfa;--good:#34d399;--warn:#fbbf24;--bad:#f87171;--font:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;touch-action:pan-y;user-select:none;-webkit-user-select:none}
body{background:radial-gradient(1000px 600px at 15% -10%,rgba(96,165,250,.16),transparent 55%),radial-gradient(800px 500px at 100% 10%,rgba(167,139,250,.12),transparent 50%),var(--bg)}
.deck{position:relative;width:100%;height:100%;height:100dvh}
.slide{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:max(28px,env(safe-area-inset-top)) max(22px,env(safe-area-inset-right)) max(72px,calc(56px + env(safe-area-inset-bottom))) max(22px,env(safe-area-inset-left));opacity:0;visibility:hidden;transform:translateX(28px) scale(.985);transition:opacity .32s ease,transform .32s ease,visibility .32s;overflow:auto;-webkit-overflow-scrolling:touch}
.slide.active{opacity:1;visibility:visible;transform:translateX(0) scale(1);z-index:2}
.slide.exit-left{opacity:0;transform:translateX(-24px) scale(.985)}
.slide.exit-right{opacity:0;transform:translateX(24px) scale(.985)}
.slide-inner{width:min(920px,100%);margin:0 auto}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:14px}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}
h1{font-size:clamp(1.8rem,7vw,3rem);line-height:1.15;font-weight:800;letter-spacing:-.02em;margin-bottom:14px}
h2{font-size:clamp(1.45rem,5.5vw,2.35rem);line-height:1.2;font-weight:750;letter-spacing:-.02em;margin-bottom:16px}
h3{font-size:clamp(1.05rem,3.5vw,1.25rem);margin-bottom:10px;font-weight:700}
.subtitle{font-size:clamp(1rem,3.5vw,1.25rem);color:var(--muted);line-height:1.55;max-width:36em}
p,li{font-size:clamp(.95rem,2.8vw,1.12rem);line-height:1.6;color:var(--muted)}
strong{color:var(--text);font-weight:700}
em{color:var(--accent);font-style:normal;font-weight:650}
ul,ol{padding-left:1.15em}li{margin:.45em 0}li::marker{color:var(--accent2)}
.center{text-align:center}.center .subtitle{margin-left:auto;margin-right:auto}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{font-size:13px;padding:7px 12px;border-radius:999px;background:rgba(96,165,250,.12);border:1px solid rgba(96,165,250,.25);color:#bfdbfe}
.chip.good{background:rgba(52,211,153,.12);border-color:rgba(52,211,153,.28);color:#a7f3d0}
.chip.warn{background:rgba(251,191,36,.12);border-color:rgba(251,191,36,.28);color:#fde68a}
.chip.purple{background:rgba(167,139,250,.12);border-color:rgba(167,139,250,.28);color:#ddd6fe}
.chip.bad{background:rgba(248,113,113,.12);border-color:rgba(248,113,113,.28);color:#fecaca}
.grid{display:grid;gap:12px;margin-top:8px}.grid.two{grid-template-columns:1fr}
@media(min-width:700px){.grid.two{grid-template-columns:1fr 1fr}}
.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:16px 16px 14px;backdrop-filter:blur(8px)}
.card h3{color:var(--text)}.card p,.card li{font-size:clamp(.9rem,2.5vw,1.02rem)}
.formula{font-family:var(--mono);font-size:clamp(.78rem,2.2vw,.95rem);line-height:1.55;background:rgba(0,0,0,.35);border:1px solid var(--border);border-radius:14px;padding:14px 16px;color:#dbeafe;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:12px 0;white-space:pre;user-select:text;-webkit-user-select:text}
.callout{margin-top:14px;padding:12px 14px;border-radius:14px;border-left:3px solid var(--accent);background:rgba(96,165,250,.08);color:#bfdbfe;font-size:clamp(.9rem,2.5vw,1.02rem);line-height:1.5}
.callout.warn{border-left-color:var(--warn);background:rgba(251,191,36,.08);color:#fde68a}
.callout.good{border-left-color:var(--good);background:rgba(52,211,153,.08);color:#a7f3d0}
.big-num{font-size:clamp(2.5rem,10vw,4rem);font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1;margin-bottom:8px}
.two-col-list{display:grid;gap:6px 18px}
@media(min-width:640px){.two-col-list{grid-template-columns:1fr 1fr}}
.flow{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:10px 0 4px}
.flow .n{background:rgba(255,255,255,.05);border:1px solid var(--border);padding:10px 12px;border-radius:12px;font-size:13.5px;color:var(--text)}
.flow .arr{color:var(--faint);font-size:14px}
.progress{position:fixed;top:0;left:0;right:0;height:3px;background:rgba(255,255,255,.06);z-index:50}
.progress>i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent2));transition:width .25s ease}
.chrome{position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:linear-gradient(to top,rgba(10,15,28,.96),rgba(10,15,28,.55),transparent);pointer-events:none}
.chrome>*{pointer-events:auto}
.counter{font-variant-numeric:tabular-nums;font-size:13px;color:var(--faint);min-width:64px}
.counter b{color:var(--muted);font-weight:650}
.nav-btns{display:flex;gap:8px}
.nav-btns button{width:44px;height:44px;border-radius:14px;border:1px solid var(--border);background:rgba(17,24,39,.85);color:var(--text);font-size:18px;cursor:pointer;backdrop-filter:blur(10px)}
.nav-btns button:disabled{opacity:.35;cursor:default}
.hint{position:fixed;top:14px;right:14px;z-index:50;font-size:11px;color:var(--faint);background:rgba(0,0,0,.25);border:1px solid var(--border);padding:5px 9px;border-radius:999px}
@media(max-width:640px){.hint{display:none}}
.top-link{position:fixed;top:14px;left:14px;z-index:50;font-size:12px;color:var(--muted);text-decoration:none;background:rgba(0,0,0,.25);border:1px solid var(--border);padding:6px 10px;border-radius:999px;backdrop-filter:blur(8px)}
body.overview .deck{overflow:auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;padding:48px 14px 80px;height:100%;align-content:start}
body.overview .slide{position:relative;inset:auto;opacity:1!important;visibility:visible!important;transform:none!important;height:120px;padding:12px;border:1px solid var(--border);border-radius:14px;background:var(--bg2);cursor:pointer;overflow:hidden}
body.overview .slide *{font-size:10px!important;line-height:1.25!important;margin:0!important}
body.overview .slide h1,body.overview .slide h2{font-size:13px!important}
body.overview .slide .formula,body.overview .slide .grid,body.overview .slide .chips,body.overview .slide ul,body.overview .slide ol,body.overview .slide .callout,body.overview .slide .flow{display:none!important}
.help-panel{display:none;position:fixed;inset:0;z-index:80;background:rgba(0,0,0,.55);backdrop-filter:blur(6px);align-items:center;justify-content:center;padding:20px}
.help-panel.show{display:flex}
.help-panel .box{width:min(420px,100%);background:#111827;border:1px solid var(--border);border-radius:18px;padding:20px}
.help-panel h3{margin-bottom:12px}
.help-panel li{color:var(--muted);font-size:.95rem}
.help-panel .close{margin-top:14px;width:100%;padding:12px;border-radius:12px;border:0;background:var(--accent);color:#0a0f1c;font-weight:700;cursor:pointer}