/* 《起跑總在開始前》公開站共用樣式：紙、紅色 PU 跑道、天空藍。零 build。 */
/* 兩個主題 × 深淺色。data-skin="cheng"（預設，程徹版：海軍藍、紅色 PU 跑道、白線、銀灰）
   與 data-skin="lin"（林向晚版：櫻花粉、玫瑰霧粉、奶油米、淡紫、紙膠帶）。
   --track 是填色（按鈕、跑道），--track-ink 是填色上的字，--accent 是當文字或線條用的強調色。 */
:root{
  --f-display:"LXGW WenKai TC","Noto Serif TC","Songti TC",serif;
  --f-serif:"Noto Serif TC","Songti TC","PMingLiU",serif;
  --f-body:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;
  --f-head:var(--f-display);
  color-scheme:light dark;
  --paper:#f1f3f7; --paper-rgb:241 243 247; --paper-2:#e3e8f0; --card:#ffffff;
  --ink:#111a30; --ink-2:#3f4a63; --ink-3:#77829a;
  --track:#d2442c; --track-ink:#fff; --accent:#c23a22; --track-2:#f08a74;
  --sky:#3d7cc9; --sky-2:#dbe6f3; --navy:#1b2a4e; --tape:#c3ccd9; --silver:#9aa6b8;
  --line:#d3dae4; --shadow:16 26 50; --end-rgb:8 14 30; --band:#101b33; --band-2:#16233f;
  --tex-blend:multiply; --tex-op:.28;
}
:root[data-skin="cheng"]{--f-head:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif}
:root[data-skin="lin"]{
  --f-head:"Huninn","LXGW WenKai TC","Noto Sans TC",sans-serif;
  --paper:#fff7f9; --paper-rgb:255 247 249; --paper-2:#fbeaf1; --card:#fffdfd;
  --ink:#5a2b46; --ink-2:#86476a; --ink-3:#b58aa2;
  --track:#f6a3bf; --track-ink:#5a1838; --accent:#c0427a; --track-2:#fcd3e1;
  --sky:#b7a3e6; --sky-2:#f1ebfb; --navy:#6552a6; --tape:#f9c6d7; --silver:#d9c7e6;
  --line:#f1d9e4; --shadow:190 110 150; --end-rgb:78 36 66; --band:#fbeef4; --band-2:#f4ecfb;
  --tex-blend:multiply; --tex-op:.22;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0a1122; --paper-rgb:10 17 34; --paper-2:#101a30; --card:#142039;
  --ink:#eaf0f8; --ink-2:#aab6c9; --ink-3:#6f7c93;
  --track:#e0432a; --track-ink:#fff; --accent:#ff7a5e; --track-2:#a8331f;
  --sky:#6fa8e8; --sky-2:#1a2a4a; --navy:#b9c9e6; --tape:#3b4966; --silver:#7d8aa1;
  --line:#22304b; --shadow:0 0 0; --end-rgb:4 8 18; --band:#060b18; --band-2:#0d1629;
  --tex-blend:soft-light; --tex-op:.3;
  }
  :root[data-skin="lin"]:not([data-theme="light"]){
    --paper:#1d1523; --paper-rgb:29 21 35; --paper-2:#271d2f; --card:#2e2337;
  --ink:#fbeef5; --ink-2:#e6b9cf; --ink-3:#a98b9e;
  --track:#ffb0c8; --track-ink:#3d1426; --accent:#ffb3cb; --track-2:#b9668a;
  --sky:#c8b6f2; --sky-2:#3a2d48; --navy:#d9cdf8; --tape:#b07391; --silver:#6f5d80;
  --line:#41324b; --shadow:0 0 0; --end-rgb:28 12 26; --band:#241a2c; --band-2:#2a1f36;
  --tex-blend:soft-light; --tex-op:.25;
  }
}
:root[data-theme="dark"]{
  --paper:#0a1122; --paper-rgb:10 17 34; --paper-2:#101a30; --card:#142039;
  --ink:#eaf0f8; --ink-2:#aab6c9; --ink-3:#6f7c93;
  --track:#e0432a; --track-ink:#fff; --accent:#ff7a5e; --track-2:#a8331f;
  --sky:#6fa8e8; --sky-2:#1a2a4a; --navy:#b9c9e6; --tape:#3b4966; --silver:#7d8aa1;
  --line:#22304b; --shadow:0 0 0; --end-rgb:4 8 18; --band:#060b18; --band-2:#0d1629;
  --tex-blend:soft-light; --tex-op:.3;
}
:root[data-theme="dark"][data-skin="lin"]{
  --paper:#1d1523; --paper-rgb:29 21 35; --paper-2:#271d2f; --card:#2e2337;
  --ink:#fbeef5; --ink-2:#e6b9cf; --ink-3:#a98b9e;
  --track:#ffb0c8; --track-ink:#3d1426; --accent:#ffb3cb; --track-2:#b9668a;
  --sky:#c8b6f2; --sky-2:#3a2d48; --navy:#d9cdf8; --tape:#b07391; --silver:#6f5d80;
  --line:#41324b; --shadow:0 0 0; --end-rgb:28 12 26; --band:#241a2c; --band-2:#2a1f36;
  --tex-blend:soft-light; --tex-op:.25;
}
/* 切換主題時顏色慢慢換過去 */
html.skinning *,html.skinning *::before,html.skinning *::after{transition:background-color .6s ease,color .6s ease,border-color .6s ease,fill .6s ease,stroke .6s ease!important}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 var(--f-body);-webkit-font-smoothing:antialiased;overflow-x:hidden}
/* 紙紋：一張雜訊 SVG 疊在全頁上，不吃點擊 */
body::before{content:"";position:fixed;inset:0;z-index:100;pointer-events:none;opacity:var(--tex-op);mix-blend-mode:var(--tex-blend);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .55  0 0 0 0 .47  0 0 0 0 .38  0 0 0 .22 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>")}
img{max-width:100%;display:block}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:6px}
.wrap{width:min(1120px,100% - 32px);margin-inline:auto}
.narrow{width:min(760px,100% - 32px);margin-inline:auto}
.display{font-family:var(--f-display);font-weight:400;letter-spacing:.02em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* 頂端導覽 */
.top{position:fixed;top:0;left:0;right:0;z-index:50;transition:background .4s,box-shadow .4s,transform .4s}
.top.solid{background:color-mix(in srgb,var(--paper) 86%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--line)}
.top .in{display:flex;align-items:center;gap:20px;height:60px}
.brand{font-family:var(--f-display);font-size:19px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px;white-space:nowrap}
.brand i{width:22px;height:14px;border-radius:3px;background:var(--track);position:relative;flex:none}
.brand i::after{content:"";position:absolute;left:5px;top:0;bottom:0;width:3px;background:rgba(255,255,255,.9)}
.top nav{margin-left:auto;display:flex;gap:4px;align-items:center}
.top nav a{color:var(--ink-2);text-decoration:none;font-size:15px;padding:6px 10px;border-radius:99px;transition:color .2s,background .2s}
.top nav a:hover{color:var(--ink);background:var(--paper-2)}
.top nav a.ost{color:var(--track-ink);background:var(--track);padding:6px 14px}
.top nav a.ost:hover{filter:brightness(1.06)}
@media (max-width:760px){.top nav a.sec{display:none}}

/* 區塊抬頭：跑道上的道次標記 */
section.blk{padding:clamp(72px,11vw,140px) 0}
.eyebrow{display:flex;align-items:center;gap:12px;margin:0 0 18px;font-size:14px;letter-spacing:.18em;color:var(--ink-2)}
.lane{display:inline-grid;place-items:center;min-width:34px;height:26px;padding:0 8px;border-radius:5px;background:var(--track);color:var(--track-ink);font:600 15px/1 var(--f-body);letter-spacing:0;box-shadow:inset 0 0 0 2px rgba(255,255,255,.75)}
h2.ttl{font-family:var(--f-display);font-weight:400;font-size:clamp(27px,4.6vw,46px);line-height:1.3;margin:0 0 28px;letter-spacing:.03em;text-wrap:balance}
.lead{font-size:clamp(17px,2vw,19px);color:var(--ink-2)}

/* 按鈕 */
.btn{display:inline-flex;align-items:center;gap:10px;height:52px;padding:0 26px;border-radius:99px;border:0;text-decoration:none;font-size:16px;letter-spacing:.06em;cursor:pointer;transition:transform .2s,box-shadow .2s,filter .2s}
.btn svg{width:18px;height:18px;fill:currentColor;flex:none}
.btn.primary{background:var(--track);color:var(--track-ink);box-shadow:0 8px 22px -8px color-mix(in srgb,var(--track) 75%,transparent)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px -8px color-mix(in srgb,var(--track) 80%,transparent)}
.btn.ghost{background:color-mix(in srgb,var(--card) 70%,transparent);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}
.btn.ghost:hover{transform:translateY(-2px)}
.btn[aria-disabled="true"]{background:var(--paper-2);color:var(--ink-3);box-shadow:inset 0 0 0 1px var(--line);cursor:default;transform:none}

/* 進場：捲到才浮上來 */
.rise{opacity:0;transform:translateY(22px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.rise.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rise{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* 頁尾 */
.foot{padding:56px 0 calc(48px + env(safe-area-inset-bottom));border-top:1px solid var(--line);color:var(--ink-2);font-size:14px}
.foot .in{display:flex;flex-wrap:wrap;gap:18px 32px;align-items:center;justify-content:space-between}
.foot p{margin:0}
.footer-icons{display:flex;gap:12px;align-items:center}
.footer-icon{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--ink-2);background:var(--card);box-shadow:inset 0 0 0 1px var(--line);transition:color .2s,transform .2s}
.footer-icon:hover{transform:translateY(-2px);color:var(--ink)}
.footer-icon[aria-label="Facebook"]:hover{color:#3b78e7}
.footer-icon[aria-label^="請作者"]:hover{color:#c98a1b}

/* 主題切換鈕：兩人的小頭像 */
.skin{display:inline-flex;align-items:center;gap:2px;padding:3px;border-radius:99px;background:color-mix(in srgb,var(--card) 78%,transparent);box-shadow:inset 0 0 0 1px var(--line);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.skin button{display:inline-flex;align-items:center;gap:6px;border:0;background:none;cursor:pointer;padding:3px 10px 3px 3px;border-radius:99px;font-size:13.5px;color:var(--ink-2);transition:background .3s,color .3s}
.skin button i{width:28px;height:28px;border-radius:50%;flex:none;background-color:var(--paper-2);background-repeat:no-repeat;box-shadow:0 0 0 2px transparent;transition:box-shadow .3s,filter .3s;filter:saturate(.6) opacity(.8)}
.skin button[data-skin-set="cheng"] i{background-size:300%;background-position:50% 4%}
.skin button[data-skin-set="lin"] i{background-size:150%;background-position:50% 18%}
.skin button[aria-pressed="true"]{background:var(--track);color:var(--track-ink)}
.skin button[aria-pressed="true"] i{box-shadow:0 0 0 2px var(--card);filter:none}
.skin button:not([aria-pressed="true"]):hover{color:var(--ink)}
@media (max-width:760px){.skin button span{display:none}.skin button{padding:3px}}
@media (max-width:760px){.top:not(.solid){background:rgb(var(--paper-rgb)/.74);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}}