/* Premium Lab — shared tokens, type, header and footer (both pages). */
:root{
  --bg:#ffffff;--bg-alt:#f5f3ef;--surface:#ffffff;--sunk:#f8f7f4;--raised:#ffffff;
  --ink:#0b1f35;--text:#1f2a37;--muted:#5a6573;--faint:#7d8792;
  --line:#e5e1da;--line-strong:#cbc5ba;
  --accent:#8a6a3f;--accent-soft:#f1ebe1;
  --btn:#0b1f35;--btn-ink:#ffffff;
  --focus:#2f5fa7;
  --pos:#2c6a4d;--pos-bg:#e7f0eb;--neg:#a43f2e;--neg-bg:#f7e8e4;--warn:#8a5a12;--warn-bg:#f8efdc;
  --hero:#0b1f35;--hero-ink:#e9edf2;--hero-muted:#a7b3c2;--hero-line:#ffffff1f;
  /* chart palette */
  --c-cap:#0b1f35;--c-loan:#8399b8;--c-cost:#c4893f;--c-gain:#3d8762;--c-disc:#d9cdb5;--c-short:#a43f2e;
  --on-cap:#ffffff;--on-loan:#0b1f35;--on-cost:#2a1b08;--on-gain:#ffffff;--on-disc:#4a3d27;
  --l-pol:#0b1f35;--l-com:#b07d3c;--l-down:#a43f2e;--l-base:#0b1f35;--l-up:#3d8762;
  --k1:#0b1f35;--k2:#b07d3c;--k3:#2f7d57;--k4:#4f6f98;--k5:#a8473a;--k6:#6b4f8f;--k7:#2a7f86;--k8:#7a6a28;
  --shadow:0 1px 2px #0b1f3510,0 8px 24px #0b1f350d;
  --serif:'Source Serif 4','Noto Serif TC','Noto Serif SC','Songti TC','Songti SC',Georgia,serif;
  --sans:'Source Sans 3','PingFang TC','PingFang SC','Noto Sans TC','Noto Sans SC','Microsoft JhengHei','Microsoft YaHei',system-ui,sans-serif;
  --wrap:1240px;--gutter:clamp(16px,4vw,40px);--hdr:68px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#0a121c;--bg-alt:#0e1823;--surface:#111c29;--sunk:#0d1722;--raised:#16222f;
  --ink:#eef1f4;--text:#d3d9e0;--muted:#9ba6b3;--faint:#76828f;
  --line:#1f2d3c;--line-strong:#344559;
  --accent:#c9a46c;--accent-soft:#2a2316;
  --btn:#eef1f4;--btn-ink:#0a121c;--focus:#8fb3ec;
  --pos:#6fc597;--pos-bg:#12291f;--neg:#ec8f7f;--neg-bg:#2e1714;--warn:#e2b45f;--warn-bg:#2b2112;
  --hero:#111c29;--hero-line:#ffffff17;
  --c-cap:#d6dee8;--c-loan:#5d7aa1;--c-cost:#d39a50;--c-gain:#4ea878;--c-disc:#6b5f4b;--c-short:#d06a58;
  --on-cap:#0a121c;--on-loan:#ffffff;--on-cost:#1c1205;--on-gain:#04130b;--on-disc:#f3ead9;
  --l-pol:#eef1f4;--l-com:#d3a560;--l-down:#ec8f7f;--l-base:#eef1f4;--l-up:#6fc597;--k1:#e3e9f0;--k2:#d8a75f;--k3:#5fbf8b;--k4:#7f9fd0;--k5:#e58a78;--k6:#b49ae0;--k7:#5cc3c9;--k8:#c9b65a;
  --shadow:0 1px 2px #0006,0 10px 30px #0005;color-scheme:dark}}
:root[data-theme=dark]{
  --bg:#0a121c;--bg-alt:#0e1823;--surface:#111c29;--sunk:#0d1722;--raised:#16222f;
  --ink:#eef1f4;--text:#d3d9e0;--muted:#9ba6b3;--faint:#76828f;
  --line:#1f2d3c;--line-strong:#344559;
  --accent:#c9a46c;--accent-soft:#2a2316;
  --btn:#eef1f4;--btn-ink:#0a121c;--focus:#8fb3ec;
  --pos:#6fc597;--pos-bg:#12291f;--neg:#ec8f7f;--neg-bg:#2e1714;--warn:#e2b45f;--warn-bg:#2b2112;
  --hero:#111c29;--hero-line:#ffffff17;
  --c-cap:#d6dee8;--c-loan:#5d7aa1;--c-cost:#d39a50;--c-gain:#4ea878;--c-disc:#6b5f4b;--c-short:#d06a58;
  --on-cap:#0a121c;--on-loan:#ffffff;--on-cost:#1c1205;--on-gain:#04130b;--on-disc:#f3ead9;
  --l-pol:#eef1f4;--l-com:#d3a560;--l-down:#ec8f7f;--l-base:#eef1f4;--l-up:#6fc597;--k1:#e3e9f0;--k2:#d8a75f;--k3:#5fbf8b;--k4:#7f9fd0;--k5:#e58a78;--k6:#b49ae0;--k7:#5cc3c9;--k8:#c9b65a;
  --shadow:0 1px 2px #0006,0 10px 30px #0005;color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;transition:background-color .25s,color .25s}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:400;letter-spacing:-.01em;text-wrap:balance;margin:0}
p{margin:0}
:lang(zh-Hant) em,:lang(zh-Hans) em{font-style:normal!important}
[hidden]{display:none!important}
.vh{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.num,.tnum{font-variant-numeric:tabular-nums}
.label{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
:lang(zh-Hant) .label,:lang(zh-Hans) .label{letter-spacing:.04em}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:8px 18px;border:1px solid var(--line-strong);background:transparent;color:var(--ink);border-radius:2px;font-size:14px;font-weight:600;letter-spacing:.01em;white-space:nowrap;transition:background-color .2s,border-color .2s,color .2s}
.btn:hover{border-color:var(--ink)}
.btn.solid{background:var(--btn);border-color:var(--btn);color:var(--btn-ink)}
.btn.solid:hover{opacity:.9}
.btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.link-arrow{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--ink);border-bottom:1px solid var(--accent);padding-bottom:2px}
.link-arrow:after{content:'→';transition:transform .2s}
.link-arrow:hover:after{transform:translateX(3px)}

/* header */
.gh{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.gh-in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);height:var(--hdr);display:flex;align-items:center;gap:28px}
.gh-brand{display:inline-flex;align-items:center;gap:11px;flex:none;color:var(--ink)}
.gh-brand .mk{width:30px;height:30px;display:grid;place-items:center;background:var(--ink);color:var(--bg);font-family:var(--serif);font-size:18px;font-weight:600;border-radius:2px}
.gh-brand .wm{font-family:var(--serif);font-size:20px;letter-spacing:-.01em;white-space:nowrap}
.gh-nav{display:flex;align-items:center;gap:26px;margin-left:auto;font-size:14.5px}
.gh-nav a{position:relative;color:var(--muted);padding:6px 0;white-space:nowrap;transition:color .2s}
.gh-nav a:hover,.gh-nav a[aria-current],.gh-nav a.is-current{color:var(--ink)}
.gh-nav a:not(.gh-cta):after{content:'';position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .35s cubic-bezier(.16,1,.3,1)}
.gh-nav a[aria-current=page]:after,.gh-nav a.is-current:after{transform:scaleX(1)}
.gh-nav .gh-cta{display:inline-flex;align-items:center;gap:8px;color:var(--btn-ink);background:var(--btn);padding:8px 14px;border-radius:2px;font-weight:600}
.gh-nav .gh-cta:hover{color:var(--btn-ink);opacity:.9}
.gh-nav a.gh-cta,.gh-nav a.gh-cta[aria-current]{color:var(--btn-ink)}
.gh-nav .gh-cta[aria-current=page]{outline:1px solid var(--accent);outline-offset:3px}
.gh-nav .gh-cta svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.gh-util{display:flex;align-items:center;gap:10px;flex:none}
.gh-lang{display:flex;border:1px solid var(--line-strong);border-radius:2px;overflow:hidden}
.gh-lang button{border:0;background:transparent;color:var(--muted);font-size:13px;min-width:36px;height:32px;padding:0 8px}
.gh-lang button+button{border-left:1px solid var(--line)}
.gh-lang button[aria-pressed=true]{background:var(--ink);color:var(--bg);font-weight:600}
.gh-icon{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--line-strong);background:transparent;border-radius:2px;color:var(--ink)}
.gh-icon svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.gh-icon .moon{display:none}
:root[data-theme=dark] .gh-icon .sun{display:none}:root[data-theme=dark] .gh-icon .moon{display:block}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .gh-icon .sun{display:none}:root:not([data-theme=light]) .gh-icon .moon{display:block}}
.gh-auth{display:flex;align-items:center;min-height:34px}
.gh-auth:empty{display:none}
.gh-signin{display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 12px;border:1px solid var(--line-strong);background:transparent;border-radius:2px;color:var(--ink);font-size:13.5px;font-weight:600}
.gh-signin:hover{border-color:var(--ink)}
.gh-signin svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round}
.gh-lang-m{display:none}
@media (max-width:560px){.gh-signin span{display:none}.gh-signin{padding:0 8px}.gh-util>.gh-lang{display:none}.gh-panel .gh-lang-m{display:flex;margin-top:14px;width:max-content}.gh-panel .gh-lang-m button{min-width:52px;height:38px;font-size:14px}}
.gh-menu{display:none}
.gh-panel{display:none}
@media (max-width:1200px){
  .gh-nav{display:none}
  .gh-util{margin-left:auto}
  .gh-menu{display:grid}
  .gh-panel{position:absolute;left:0;right:0;top:100%;background:var(--bg);border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:8px var(--gutter) 20px;animation:gh-drop .28s cubic-bezier(.16,1,.3,1)}
  .gh.open .gh-panel{display:block}
  .gh-panel a{display:flex;justify-content:space-between;align-items:center;padding:14px 2px;border-bottom:1px solid var(--line);font-size:16px;color:var(--ink)}
  .gh-panel a[aria-current=page]{font-weight:600}
  .gh-panel a[aria-current=page]:after,.gh-panel a:hover:after{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent)}
  .gh-panel .gh-cta{margin-top:14px;justify-content:center;gap:8px;background:var(--btn);color:var(--btn-ink);border:0;border-radius:2px;font-weight:600}
  .gh-panel .gh-cta:after{display:none}
}
@media (max-width:560px){.gh-brand .wm{font-size:18px}.gh-in{gap:12px}.gh-lang button{min-width:32px;padding:0 6px}}
@keyframes gh-drop{from{opacity:0;transform:translateY(-6px)}}

/* footer */
.gf{border-top:1px solid var(--line);background:var(--bg-alt);margin-top:96px}
.gf-in{max-width:var(--wrap);margin:0 auto;padding:44px var(--gutter) 36px;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px;font-size:13.5px;color:var(--muted)}
.gf h4{font-family:var(--sans);font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--ink);margin-bottom:12px}
.gf a{display:block;padding:3px 0}.gf a:hover{color:var(--ink)}
.gf .gf-brand{font-family:var(--serif);font-size:20px;color:var(--ink);margin-bottom:10px}
.gf-base{max-width:var(--wrap);margin:0 auto;padding:16px var(--gutter) 28px;border-top:1px solid var(--line);font-size:12.5px;color:var(--faint)}
@media (max-width:760px){.gf-in{grid-template-columns:1fr;gap:26px}}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
@media print{:root,:root[data-theme=dark],:root:not([data-theme=light]){  --bg:#ffffff;--bg-alt:#f5f3ef;--surface:#ffffff;--sunk:#f8f7f4;--raised:#ffffff;  --ink:#0b1f35;--text:#1f2a37;--muted:#5a6573;--faint:#7d8792;  --line:#e5e1da;--line-strong:#cbc5ba;  --accent:#8a6a3f;--accent-soft:#f1ebe1;  --btn:#0b1f35;--btn-ink:#ffffff;  --focus:#2f5fa7;  --pos:#2c6a4d;--pos-bg:#e7f0eb;--neg:#a43f2e;--neg-bg:#f7e8e4;--warn:#8a5a12;--warn-bg:#f8efdc;  --hero:#0b1f35;--hero-ink:#e9edf2;--hero-muted:#a7b3c2;--hero-line:#ffffff1f;  /* chart palette */  --c-cap:#0b1f35;--c-loan:#8399b8;--c-cost:#c4893f;--c-gain:#3d8762;--c-disc:#d9cdb5;--c-short:#a43f2e;  --on-cap:#ffffff;--on-loan:#0b1f35;--on-cost:#2a1b08;--on-gain:#ffffff;--on-disc:#4a3d27;  --l-pol:#0b1f35;--l-com:#b07d3c;--l-down:#a43f2e;--l-base:#0b1f35;--l-up:#3d8762;--k1:#0b1f35;--k2:#b07d3c;--k3:#2f7d57;--k4:#4f6f98;--k5:#a8473a;--k6:#6b4f8f;--k7:#2a7f86;--k8:#7a6a28;  --shadow:0 1px 2px #0b1f3510,0 8px 24px #0b1f350d;  --serif:'Source Serif 4','Noto Serif TC','Noto Serif SC','Songti TC','Songti SC',Georgia,serif;  --sans:'Source Sans 3','PingFang TC','PingFang SC','Noto Sans TC','Noto Sans SC','Microsoft JhengHei','Microsoft YaHei',system-ui,sans-serif;  --wrap:1240px;--gutter:clamp(16px,4vw,40px);--hdr:68px;  color-scheme:light}.gh,.gf{display:none!important}body{background:#fff}}