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.site-nav{z-index:100;border-bottom:1px solid color-mix(in srgb, var(--ink) 18%, transparent);background:color-mix(in srgb, var(--bg) 94%, transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);position:sticky;top:0}.site-nav-bar{width:min(100%, calc(var(--web-content-max) + (var(--web-safe-inline) * 2)));min-height:72px;padding:10px var(--web-safe-inline);align-items:center;gap:clamp(24px,4vw,56px);margin:0 auto;display:flex;position:relative}.site-nav-brand,.site-nav-link,.site-nav-menu-button,.site-nav-language,.site-nav-account{min-height:44px}.site-nav-brand{font-family:var(--font-display-en);letter-spacing:.055em;flex:none;align-items:center;font-size:17px;display:inline-flex}.site-nav-panel,.site-nav-links,.site-nav-actions{align-items:center;display:flex}.site-nav-panel{flex:1;justify-content:space-between;gap:24px;min-width:0}.site-nav-links{gap:clamp(18px,2.4vw,36px)}.site-nav-actions{gap:12px}.site-nav-link,.site-nav-language,.site-nav-account{color:var(--ink);font:inherit;cursor:pointer;background:0 0;border:0;justify-content:center;align-items:center;font-size:14px;font-weight:650;display:inline-flex;position:relative}.site-nav-link{padding:0 4px}.site-nav-link:after,.site-nav-account:after{border-radius:var(--radius-pill);background:var(--brand-yellow);content:"";opacity:0;height:3px;transition:opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);position:absolute;bottom:4px;left:4px;right:4px;transform:scaleX(.35)}.site-nav-link:hover:after,.site-nav-link[aria-current=page]:after,.site-nav-account[aria-current=page]:after{opacity:1;transform:scaleX(1)}.site-nav-language{min-width:48px;color:var(--ink-60);font-family:var(--font-mono);padding:0 10px}.site-nav-account{padding:0 4px}.site-nav-menu-button{border:1px solid var(--ink);border-radius:var(--radius-pill);background:var(--web-surface);width:48px;box-shadow:var(--shadow-thick-white);cursor:pointer;margin-left:auto;padding:0 12px;display:none}.site-nav-menu-button span{border-radius:var(--radius-pill);background:var(--ink);width:100%;height:2px;transition:transform var(--dur-fast) var(--ease-out);margin:5px 0;display:block}.site-nav-menu-button[aria-expanded=true] span:first-child{transform:translateY(3.5px)rotate(45deg)}.site-nav-menu-button[aria-expanded=true] span:last-child{transform:translateY(-3.5px)rotate(-45deg)}@media (max-width:720px){.site-nav-bar{min-height:68px;padding-block:8px}.site-nav-brand{font-size:15px}.site-nav-menu-button{display:block}.site-nav-panel{padding:20px var(--web-safe-inline) 24px;border-bottom:1px solid color-mix(in srgb, var(--ink) 18%, transparent);background:var(--bg);box-shadow:var(--shadow-soft);opacity:0;pointer-events:none;visibility:hidden;transition:opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);gap:18px;display:grid;position:absolute;top:calc(100% + 1px);left:0;right:0;transform:translateY(-10px)}.site-nav-panel[data-open=true]{opacity:1;pointer-events:auto;visibility:visible;transform:translateY(0)}.site-nav-links,.site-nav-actions{grid-template-columns:1fr;gap:8px;display:grid}.site-nav-link,.site-nav-language,.site-nav-account{justify-content:flex-start;width:100%;padding:0 16px}.site-nav-link:after,.site-nav-account:after{width:42px;bottom:2px;left:16px;right:auto}.site-nav-account{justify-content:flex-start}}@media (prefers-reduced-motion:reduce){.site-nav-panel,.site-nav-menu-button span,.site-nav-link:after,.site-nav-account:after{transition:none}}
:root{--brand-yellow:#ffe500;--yellow-press:#ebd200;--yellow-soft:#fff9c2;--yellow-deep:#e0c900;--ink:#17170f;--ink-60:#77776d;--ink-30:#b8b6ab;--bg:#fdfcf8;--bg-soft:#f4f2ea;--cream-deep:#eceae2;--line:#f0eee6;--danger:#e5484d;--scrim:#17170f99;--gray-text:var(--ink-60);--gray-line:var(--line);--shadow-thick-white:0 2px 0 var(--cream-deep);--shadow-thick-yellow:0 2px 0 var(--yellow-deep);--shadow-soft:0 5px 11px #1e1c1414;--shadow-soft-sub:0 5px 11px #1e1c140a;--shadow-glow:0 4px 9px #d6b4004d;--fs-display:clamp(44px, 7vw, 88px);--fs-h1:clamp(32px, 4.5vw, 56px);--fs-h2:clamp(24px, 3vw, 36px);--fs-lead:20px;--fs-body:17px;--fs-aux:14px;--fs-num:64px;--gap-group:48px;--gap-card:24px;--gap-tight:12px;--gap-screen:clamp(72px, 12vh, 140px);--radius-card:20px;--radius-input:12px;--radius-pill:999px;--ease-out:cubic-bezier(.22, 1, .36, 1);--dur-fast:.18s;--dur-base:.36s;--font-zh:system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--font-display-en:"Anton", "Arial Narrow", sans-serif;--font-mono:ui-monospace, "SF Mono", Menlo, monospace;--web-surface:#fff;--web-content-max:1280px;--web-reading-max:680px;--web-safe-inline:clamp(24px, 5vw, 72px);--web-safe-block:clamp(72px, 12vh, 136px);--web-section-space:clamp(96px, 16vh, 176px);--web-media-safe:clamp(24px, 5vw, 64px);--web-touch-target:44px;--web-focus-ring:3px solid var(--brand-yellow);--web-motion-enter:.72s;--web-motion-signature:4s}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font-zh);font-size:var(--fs-body);-webkit-font-smoothing:antialiased;line-height:1.6}a{color:inherit;text-decoration:none}::selection{background:var(--brand-yellow);color:var(--ink)}:focus-visible{outline:var(--web-focus-ring);outline-offset:3px}.t-display{font-size:var(--fs-display);letter-spacing:-.02em;font-weight:900;line-height:1.08}.t-display-zh{font-size:var(--fs-display);letter-spacing:-.01em;text-wrap:balance;font-weight:900;line-height:1.04}.t-h1{font-size:var(--fs-h1);letter-spacing:-.015em;font-weight:800;line-height:1.15}.t-h2{font-size:var(--fs-h2);letter-spacing:-.01em;font-weight:700;line-height:1.25}.t-lead{font-size:var(--fs-lead);color:var(--ink-60);line-height:1.7}.t-aux{font-size:var(--fs-aux);color:var(--ink-60)}.t-en-display{font-family:var(--font-display-en);letter-spacing:.01em;text-transform:uppercase}.t-mono{font-family:var(--font-mono);font-size:var(--fs-aux);color:var(--ink-30);letter-spacing:.04em}.sb-soft{border-radius:var(--radius-card);box-shadow:var(--shadow-thick-white), var(--shadow-soft);background:#fff}.sb-soft--sub{border-radius:var(--radius-card);box-shadow:var(--shadow-thick-white), var(--shadow-soft-sub);background:#fff}.btn-primary{background:var(--brand-yellow);color:var(--ink);border-radius:var(--radius-pill);min-width:160px;font-size:var(--fs-body);font-weight:700;font-family:var(--font-zh);box-shadow:var(--shadow-thick-yellow), var(--shadow-glow);cursor:pointer;transition:transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);border:none;justify-content:center;align-items:center;gap:8px;padding:14px 36px;display:inline-flex}.btn-primary:hover{transform:translateY(-1px)}.btn-primary:active{box-shadow:0 0 0 var(--yellow-deep), var(--shadow-glow);transform:translateY(2px)}.btn-primary:disabled{background:var(--bg-soft);color:var(--ink-30);box-shadow:none;cursor:default}.btn-secondary{color:var(--ink);border-radius:var(--radius-pill);font-size:var(--fs-aux);box-shadow:var(--shadow-thick-white), var(--shadow-soft-sub);cursor:pointer;transition:transform var(--dur-fast) var(--ease-out);background:#fff;border:none;justify-content:center;align-items:center;padding:12px 28px;font-weight:600;display:inline-flex}.btn-secondary:hover{transform:translateY(-1px)}.btn-secondary:active{box-shadow:none;transform:translateY(2px)}.card{border-radius:var(--radius-card);box-shadow:var(--shadow-thick-white), var(--shadow-soft-sub);background:#fff;padding:20px}.dot-grid{background-image:radial-gradient(circle, var(--cream-deep) 1px, transparent 1px);background-size:28px 28px}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}