:root{color-scheme:light;--ink:#342725;--muted:#76655f;--rose:#aa7163;--line:#e0c7ba;--red:#bd0015;--result-size:42px;--paper:#fffdf9;--shine:linear-gradient(115deg,#8e5147 0%,#e7b4a1 13%,#fff7de 26%,#b27060 43%,#f9dfca 60%,#9e6253 78%,#edc6b1 100%)}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 80% 0,#f0dbce70,transparent 45%),#fbf7f2;color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;font-size:20px;line-height:1.55}a{color:inherit;text-decoration:none}button,input,select{font:inherit;color:inherit}button,select,summary,a{touch-action:manipulation}button,select{cursor:pointer}button{min-height:54px;padding:9px 20px;border:1px solid #c7a28b;border-radius:11px;background:linear-gradient(#fff9ee,#e9d4bc);font-weight:600}button:hover{filter:brightness(.98)}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,a:focus-visible,.tape:focus-visible{outline:3px solid #986220;outline-offset:4px}input,select{height:58px;max-width:100%;min-width:0;border:1px solid #bda494;border-radius:10px;background:#fff;padding:8px 14px}input{width:100%}label{display:flex;flex-direction:column;gap:8px;font-size:18px;font-weight:600}.site-header{padding:20px clamp(18px,3vw,54px);display:flex;justify-content:space-between;align-items:center;gap:12px;background:#fffaf5;border-bottom:3px solid #d1a08e;border-image:var(--shine) 1}.brand{font-family:Georgia,serif;font-size:28px;letter-spacing:2px;font-weight:700}.brand span{font-size:21px;font-weight:400;letter-spacing:3px}.back{font-size:17px;color:var(--muted)}main{padding:26px clamp(14px,3vw,54px) 40px}.heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:24px}.eyebrow{font-size:14px;letter-spacing:2px;color:var(--rose);margin:0 0 5px}h1{font-size:clamp(34px,4vw,48px);line-height:1.2;margin:0}.subtitle{font-size:20px;color:var(--muted);margin:12px 0 0}.edition{padding:9px 18px;border:1px solid #dbbcac;border-radius:30px;font-size:17px;white-space:nowrap;background:#fff9ee}.input-card,.ruler-card,.settings-card,.result-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:0 7px 24px #79423208}.input-card{padding:24px;position:relative;margin-bottom:24px;border-top:4px solid #ca9c87}.size-fields{display:grid;grid-template-columns:minmax(180px,1fr) minmax(140px,220px) auto;align-items:end;gap:18px}.size-label input{font-size:32px;font-weight:650;height:64px;letter-spacing:.5px}.size-fields select,.size-fields button{height:64px}.primary{background:linear-gradient(135deg,#805044,#ad7865 45%,#8e5d4f);color:white;border-color:#8e5d4f}.input-bottom{display:flex;justify-content:space-between;gap:14px;align-items:center;flex-wrap:wrap;margin-top:18px}#conversion{color:var(--ink);font-variant-numeric:tabular-nums;font-size:36px;line-height:1.5;max-width:100%;overflow-wrap:anywhere}.steps{display:flex;gap:10px}.steps button{font-size:18px;min-height:46px}.error{color:#a32625;background:#fff0ed;border-radius:8px;padding:10px 14px;margin:14px 0 0}.error[hidden]{display:none}.ruler-card{overflow:hidden;margin-bottom:24px}.ruler-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:20px 24px 10px}.ruler-toolbar strong{font-size:23px;display:block}.ruler-toolbar span{display:block;font-size:16px;color:var(--muted);margin-top:3px}.zoom-label{flex-direction:row;align-items:center;font-size:16px;white-space:nowrap}.zoom-label select{height:44px;padding:5px 10px}.tape-labels{display:flex;flex-wrap:wrap;gap:8px 22px;padding:8px 24px 18px;font-size:16px;color:var(--muted)}.tape-labels span:first-child{color:var(--red)}.tape{position:relative;overflow:hidden;background:#fffdf7;border-block:1px solid #dbc7b8;touch-action:pan-y;cursor:grab;user-select:none;height:360px}.tape:active{cursor:grabbing}.tape[aria-disabled=true]{opacity:.45;cursor:default}.tape svg{display:block;width:100%;height:360px}.needle{position:absolute;inset:0 auto 0 50%;width:2px;transform:translateX(-50%);background:#a86c1c;pointer-events:none;box-shadow:0 0 0 2px #f1c26d40}.needle span{position:absolute;left:-7px;top:0;width:16px;height:14px;background:#a86c1c;clip-path:polygon(0 0,100% 0,50% 100%)}.ruler-note{font-size:15px;color:var(--muted);padding:12px 24px;margin:0}.results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:24px}.result-card{padding:24px;position:relative;border-top:4px solid #a89284}.result-card.good{border-top-color:#b54d48}.result-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.result-top h2{font-size:22px;margin:0}.badge{display:inline-block;font-size:18px;padding:3px 13px;border:1px solid #b5a59c;border-radius:8px;background:#f1edeb}.good .badge{color:var(--red);background:#ffefeb;border-color:#e1b1a8}.result-word{font-family:"KaiTi","STKaiti","Microsoft YaHei",sans-serif;font-size:42px;font-weight:700;line-height:1.3;margin:20px 0 14px;letter-spacing:2px}.good .result-word{color:var(--red)}.result-word span{font-size:32px;margin-left:18px}.range{margin:0;font-size:18px;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.range small{font-size:15px;color:var(--muted)}.cycle{font-size:15px;color:var(--muted);margin:10px 0 0}.boundary{font-size:17px;padding:10px 12px;background:#fff2ce;border:1px solid #d8b673;border-radius:8px;margin:16px 0 0}.settings-card{padding:20px 24px}summary{cursor:pointer;font-weight:600;min-height:32px}summary span{font-weight:400;font-size:16px;margin-left:14px;color:var(--muted)}.settings-card p{font-size:17px;color:var(--muted);margin:16px 0}.period-fields{display:grid;grid-template-columns:minmax(140px,1fr) minmax(140px,1fr) auto auto;gap:14px;align-items:end}.settings-card .small{font-size:15px;margin-bottom:0}footer{font-size:15px;color:var(--muted);padding:15px 2px}footer p{margin-bottom:10px}footer summary{font-size:14px}footer a{display:block;text-decoration:underline;margin:9px 0}.results:empty{display:none}
@media(min-width:1800px){main{max-width:1800px;margin:auto}}
@media(max-width:800px){.period-fields{grid-template-columns:1fr 1fr}.results{gap:14px}.result-card{padding:19px}.result-top h2{font-size:20px}.result-card{--result-size:38px}.result-word{font-size:var(--result-size)}.result-word span{font-size:30px;margin-left:10px}}
@media(max-width:560px){body{font-size:18px}.site-header{padding:15px 18px}.brand{font-size:24px}.brand span{font-size:17px}.back{font-size:15px}.heading{align-items:flex-start}.edition{display:none}main{padding-top:22px}.input-card{padding:18px}.size-fields{grid-template-columns:minmax(0,1fr) 135px;gap:13px}.size-fields button{grid-column:1/-1;height:52px}.input-bottom{gap:12px}.steps{width:100%}.steps button{flex:1}.results{grid-template-columns:1fr}.ruler-toolbar{padding:17px 16px 8px}.ruler-toolbar span{font-size:14px;max-width:190px}.ruler-toolbar strong{font-size:21px}.zoom-label{flex-direction:column;gap:3px;font-size:14px}.tape-labels{padding:6px 16px 12px;gap:5px 15px;font-size:14px}.ruler-note{padding:12px 16px;font-size:14px}.settings-card{padding:18px}summary span{display:block;margin:5px 0 0 18px}.period-fields{gap:14px 10px}.period-fields label{font-size:16px}.period-fields button{padding:9px 12px}.result-top h2{font-size:22px}.result-card{--result-size:42px}.result-word{font-size:var(--result-size)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

/* v30: warm wood, red / black traditional ruler, matching result glyph sizes. */
body{background:radial-gradient(ellipse at 5% 0,#f2d5b4aa,transparent 45%),radial-gradient(ellipse at 95% 38%,#dfad9450,transparent 50%),repeating-linear-gradient(100deg,#9d745505 0 1px,transparent 1px 7px),#faf3e9}
.site-header{background:linear-gradient(105deg,#fffdf8,#f5dfca 64%,#fff9ec);box-shadow:0 4px 20px #9b6a4210}
.input-card,.settings-card{background:linear-gradient(115deg,#fffdf9f5,#f5e6d2eb);box-shadow:0 8px 28px #79502c0d,inset 0 1px #fff}
.ruler-card{border-color:#c3a180;background:linear-gradient(110deg,#fff9ed,#eed8bb);box-shadow:0 12px 32px #67411e16,inset 0 1px #fff}
.ruler-toolbar{padding-top:22px}
.tape{border-block:2px solid #b78d5e;background:#eed5ac}
.tape svg{font-family:"KaiTi","STKaiti","Kaiti SC","Noto Serif CJK SC","Microsoft YaHei",serif}
.needle{width:2px;background:#d00018;box-shadow:0 0 0 1px #ffdcba45}
.needle span{left:-10px;width:22px;height:24px;background:#d00018;filter:drop-shadow(0 2px 2px #3c190b40)}
.tape-labels{align-items:center}
.tape-labels .legend-good,.tape-labels .legend-bad{display:inline-flex;align-items:center;gap:7px;color:#3a2922}
.legend-good::before,.legend-bad::before{content:"";display:inline-block;width:13px;height:13px;border-radius:2px;background:#bd0015}
.legend-bad::before{background:#090909}
.result-card{border:1px solid #d6b58f;border-top:5px solid #090909;background:repeating-linear-gradient(0deg,#75431c04 0 1px,transparent 1px 5px),linear-gradient(115deg,#fffaf0,#efdabd);box-shadow:0 8px 25px #75472512,inset 0 1px #fff}
.result-card.good{border-top-color:#bd0015}
.result-top{align-items:center;min-height:64px}
.result-top h2{max-width:calc(100% - 82px)}
.badge,.result-word{font-family:"KaiTi","STKaiti","Kaiti SC","Microsoft YaHei",serif;font-size:var(--result-size);font-weight:700;line-height:1.3}
.badge,.good .badge{display:flex;align-items:center;justify-content:center;flex-shrink:0;min-width:66px;min-height:66px;padding:4px 10px;border:1px solid #090909;border-radius:9px;color:#fffdf5;background:#090909;box-shadow:inset 0 1px #ffffff30,0 3px 8px #34201214}
.good .badge{background:#bd0015;border-color:#bd0015}
.bad .result-word{color:#090909}
.result-word{margin-top:14px}
.ruler-note{background:#fff7e77a}
@media(max-width:560px){.ruler-toolbar{padding-top:17px}.tape-labels{gap:6px 13px}.result-top h2{font-size:20px}.result-card{padding:20px}.ruler-toolbar span{max-width:175px}}

.inch-note{margin:12px 0 0;font-size:16px;color:var(--muted)}.inch-note[hidden]{display:none}

.copy-area{border-top:1px solid #d6b58f;margin-top:20px;padding-top:18px}.copy-good{width:100%;font-size:19px}.copy-status{font-size:16px;margin:8px 0 0;color:var(--muted)}.copy-status:empty{display:none}.copy-fallback{width:100%;min-height:230px;margin-top:10px;padding:12px;font-family:inherit;font-size:18px;line-height:1.6;background:#fffaf1;color:var(--ink);border:1px solid #bda494;border-radius:8px}.copy-fallback[hidden]{display:none}

/* v34: larger labels and ruler names, live input without redundant buttons. */
.size-fields{grid-template-columns:minmax(0,1fr) minmax(150px,220px)}
.size-fields label,.size-fields select{font-size:32px}
.size-fields label{line-height:1.3}
.tape-labels{font-size:24px;line-height:1.5;gap:8px 24px}
.ruler-toolbar strong{font-size:28px}
.result-top h2{font-size:calc(var(--result-size) + 4px);line-height:1.25;overflow-wrap:normal}
.ruler-alias{display:block;font-size:24px;font-weight:600;margin-top:4px}
@media(max-width:560px){.size-fields{grid-template-columns:minmax(0,1fr) 135px}.tape-labels{font-size:21px;gap:6px 16px}.ruler-toolbar strong{font-size:25px}.ruler-alias{font-size:22px}}

/* v35: equal-height result cards with aligned copy buttons. */
.results{align-items:stretch}
.result-card{display:flex;flex-direction:column}
.copy-area{margin-top:auto;padding-top:18px;position:relative}
.result-card .cycle,.result-card .boundary{margin-bottom:20px}
.copy-status{position:absolute;top:100%;left:0;right:0;font-size:14px;line-height:1.4;margin-top:5px}
.copy-area{margin-bottom:24px}
.copy-fallback:not([hidden]){position:relative;margin-top:36px}