/* chrono-compass — circadian day/night aesthetic. Dependency-free. */
:root{
  --bg:#f4f1ea; --ink:#1b1d24; --ink2:#5c6072; --line:#e2ddd0; --card:#fffdf8;
  --indigo:#3a3f7a; --indigo-soft:#e7e7f2; --amber:#dd8a1c; --amber-soft:#f8ead1;
  --teal:#227d6e; --ember:#b4541f;
  --night:#2c3150; --dayfill:#fbf7ee; --brightfill:#f2b34a; --avoidfill:#8f9bc4;
  --shadow:0 1px 2px rgba(20,20,30,.04),0 10px 30px rgba(20,20,30,.07);
  --serif:Georgia,"Times New Roman","Songti SC","SimSun",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;
  --mono:ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{max-width:900px;margin:0 auto;padding:30px 20px 70px}
a{color:var(--teal)}

.masthead{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;flex-wrap:wrap}
.brand{display:flex;gap:14px;align-items:flex-start}
.compass{font-size:32px;color:var(--amber);line-height:1;margin-top:3px}
h1{font-family:var(--serif);font-size:25px;font-weight:700;margin:0}
h1 .zhname{font-size:17px;color:var(--ink2);font-weight:400}
.tag{margin:3px 0 0;color:var(--ink2);font-size:14px;max-width:50ch}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--card)}
.seg button{border:none;background:none;padding:7px 13px;font-size:13px;cursor:pointer;color:var(--ink2);font-family:inherit;font-weight:600;white-space:nowrap}
.seg button.on{background:var(--indigo);color:#fff}
.privacy{font-size:12.5px;color:var(--ink2);background:var(--indigo-soft);border:1px solid #d5d5ea;border-radius:10px;padding:8px 13px;margin:16px 0 20px}

.card{background:var(--card);border:1px solid var(--line);border-radius:15px;padding:20px;margin-bottom:18px;box-shadow:var(--shadow)}
.card h2{font-family:var(--serif);font-size:18px;margin:0 0 14px}

.inputs .row{display:flex;align-items:center;gap:14px;margin-bottom:14px;flex-wrap:wrap}
.inputs .lbl{font-size:13px;font-weight:600;color:var(--ink2);min-width:64px}
#hours{flex:1;min-width:160px;accent-color:var(--amber)}
.hoursOut{font-family:var(--mono);font-size:16px;color:var(--amber);min-width:44px}
.assume{font-size:12px;color:#a29a88;margin:4px 0 0}

.hero{background:linear-gradient(165deg,#fffdf8,#f6efe1);border-color:#ece1cc;text-align:center;padding:26px 20px}
.hero-strat{font-family:var(--mono);font-size:12.5px;letter-spacing:.5px;color:var(--indigo);font-weight:700;text-transform:uppercase;margin:0 0 6px}
.hero-kicker{font-family:var(--serif);font-size:17px;color:var(--ink2)}
.hero-num{display:inline-flex;align-items:baseline;gap:8px;margin:2px 10px}
.hero-num b{font-family:var(--serif);font-size:60px;font-weight:700;color:var(--amber);line-height:1}
.hero-num .unit{font-size:19px;color:var(--ink2)}
.hero-sub{margin:8px auto 0;font-size:14px;color:var(--ink2);max-width:48ch}

.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:11.5px;color:var(--ink2);margin-bottom:10px}
.lg{display:inline-flex;align-items:center;gap:6px}
.sw{width:14px;height:11px;border-radius:2px;display:inline-block}
.sw.night{background:var(--night)}
.sw.bright{background:var(--brightfill)}
.sw.avoid{background:var(--avoidfill)}
.sw.day{background:var(--dayfill);border:1px solid var(--line)}
.sw.line{width:16px;height:0;border-top:2px solid var(--teal)}
.sw.line.grey{border-top-color:#b7b1a2}

.hourhead{display:flex;justify-content:space-between;font-family:var(--mono);font-size:10px;color:#a29a88;margin:0 0 2px;padding-left:52px}
.dayrow{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.dayrow .dnum{font-family:var(--mono);font-size:11px;color:var(--ink2);min-width:42px}
.daybar{width:100%;height:24px;display:block;border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.dayrow.done .dnum{color:var(--teal)}
.wintext{font:11px/1.4 var(--mono);color:var(--ink2);margin:1px 0 9px 52px}
.wintext .b{color:var(--amber);font-weight:700}
.wintext .a{color:var(--indigo);font-weight:700}

.chartbox h2{margin-bottom:6px}
.chart-note{font-size:12.5px;color:var(--ink2);margin:0 0 8px;max-width:66ch}
.chart{width:100%;overflow:hidden}
.chart svg{width:100%;height:auto;display:block}
.grid{stroke:#eee7d8;stroke-width:1}
.ax{stroke:var(--line);stroke-width:1}
.axlbl{fill:var(--ink2);font-size:11px;font-family:var(--sans)}
.lineB{fill:none;stroke:#b7b1a2;stroke-width:2}
.lineR{fill:none;stroke:var(--teal);stroke-width:2.5}
.dot{fill:var(--teal);stroke:#fff;stroke-width:2}

.explain{padding:0 20px}
.explain summary{cursor:pointer;font-family:var(--serif);font-size:16px;font-weight:700;padding:18px 0;list-style:none}
.explain summary::-webkit-details-marker{display:none}
.explain summary::before{content:"▸ ";color:var(--amber)}
.explain[open] summary::before{content:"▾ "}
.explain-body{padding:0 0 18px;font-size:13.5px;color:var(--ink2)}
.explain-body h4{color:var(--ink);margin:14px 0 5px;font-size:14px}
.explain-body code{background:#f0ece2;padding:1px 6px;border-radius:5px;color:var(--ember);font-size:12.5px}

footer{text-align:center;font-size:12.5px;color:var(--ink2);margin-top:26px}
footer #modelNote{color:#a29a88;font-size:11.5px}
.disclaimer{font-size:11.5px;color:#a29a88;margin:8px auto 0;max-width:62ch}

@media(max-width:680px){ h1{font-size:22px} .hero-num b{font-size:48px} .wintext{margin-left:0} }