:root{color-scheme:light;--paper:#f7f8f5;--ink:#202622;--muted:#899087;--accent:#38755c;--line:#dfe4dc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Noto Sans KR",sans-serif;font-synthesis:none}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--paper)}body{min-height:100svh;display:flex;flex-direction:column;color:var(--ink);-webkit-font-smoothing:antialiased}.masthead{padding:38px 48px;position:absolute;inset:0 0 auto}.brand{display:inline-flex;align-items:center;gap:9px;font-size:22px;font-weight:750;letter-spacing:-1.2px}.brand svg{width:25px;height:25px}.brand-period{color:var(--accent);margin-left:-7px}main{min-height:100svh;display:flex;align-items:center;justify-content:center;padding:110px 24px 100px}.clock-panel{width:100%;text-align:center;transform:translateY(-2px)}.timezone{display:flex;align-items:center;justify-content:center;gap:10px;margin:0 0 28px;color:#777f76;font-size:11px;font-weight:550;letter-spacing:2px}.timezone-dot{width:5px;height:5px;background:#8eaa92;border-radius:50%;margin-right:2px}.timezone-divider{color:#c5cbc2;margin:0 3px;font-weight:400}.clock{font-family:"Helvetica Neue",Arial,sans-serif;display:inline-flex;align-items:center;justify-content:center;font-variant-numeric:tabular-nums;font-feature-settings:"tnum";font-size:clamp(70px,14.25vw,216px);font-weight:500;letter-spacing:-.055em;line-height:1.12;white-space:nowrap;user-select:none}.clock>span:not(.colon){display:inline-block;width:1.13em;text-align:center}.clock .colon{color:#a4ada1;display:inline-block;width:.38em;text-align:center;font-size:.71em;font-weight:400;transform:translateY(-.05em);letter-spacing:0}.seconds{color:#889382;transition:color .35s}.controls{display:flex;align-items:center;flex-direction:column;gap:20px;margin-top:53px}button{font:inherit;display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:54px;padding:0 20px;border-radius:100px;border:1px solid var(--line);background:#fcfdfb;color:#515b50;box-shadow:0 2px 4px #24322003;cursor:pointer;transition:background .2s,border-color .2s,box-shadow .2s,transform .15s;touch-action:manipulation}button:hover{background:white;border-color:#bfcbbb;box-shadow:0 3px 12px #26392509}button:active{transform:scale(.98)}button:focus-visible{outline:3px solid #38755c55;outline-offset:5px}.sound-icon{width:20px;height:20px}.sound-waves{display:none}.button-label{font-size:14px;font-weight:600;letter-spacing:-.2px}.toggle-state{font-size:12px;color:#8c9588;margin-left:-4px}.switch-track{position:relative;display:block;width:31px;height:19px;border-radius:20px;background:#dce2d8;margin-left:6px;transition:background .2s}.switch-track>span{display:block;position:absolute;width:13px;height:13px;left:3px;top:3px;background:white;border-radius:50%;box-shadow:0 1px 3px #21301f18;transition:transform .2s}button[aria-checked=true]{background:#edf3eb;border-color:#c4d5c0;color:#326247}button[aria-checked=true] .toggle-state{color:#5e815e}button[aria-checked=true] .switch-track{background:#57865a}button[aria-checked=true] .switch-track>span{transform:translateX(12px)}button[aria-checked=true] .sound-waves{display:block}button[aria-checked=true] .sound-mute{display:none}.hint{margin:0;padding:0 12px;color:var(--muted);font-size:12px;letter-spacing:-.15px;line-height:1.7;min-height:21px}.counting .seconds{color:var(--accent)}.counting .timezone-dot{background:var(--accent)}.counting .hint{color:var(--accent)}footer{position:absolute;inset:auto 0 30px;text-align:center;font-size:11px;letter-spacing:1px;color:#a5ada0}button:disabled{cursor:wait;opacity:.7}@media(min-width:1600px){.clock{font-size:230px}}@media(max-width:600px){.masthead{padding:27px 25px}.brand{font-size:20px}.brand svg{width:23px;height:23px}.timezone{font-size:9px;letter-spacing:1.5px;gap:8px;margin-bottom:26px}.clock{font-size:19.8vw;letter-spacing:-.05em}.controls{margin-top:42px;gap:19px}button{min-height:52px;padding:0 19px}.hint{font-size:11px}main{padding-inline:12px}.clock-panel{transform:translateY(-6px)}footer{bottom:26px;font-size:10px}}@media(max-height:450px){.masthead{padding:18px 25px}.clock{font-size:100px}.timezone{margin-bottom:12px}.controls{margin-top:22px;gap:10px}main{padding-top:70px;padding-bottom:55px}footer{bottom:14px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important}}
.preview-button{min-height:36px;padding:4px 12px;gap:7px;border:0;background:transparent;box-shadow:none;color:#73836e;font-size:11px;font-weight:500;letter-spacing:-.1px;margin-top:-9px}.preview-button svg{width:14px;height:14px}.preview-button:hover{background:#eaf0e6;box-shadow:none}.preview-button .preview-stop{display:none}.preview-button[aria-pressed=true]{color:#38755c;background:#edf3eb}.preview-button[aria-pressed=true] .preview-play{display:none}.preview-button[aria-pressed=true] .preview-stop{display:block}
.brand{margin:0}.brand-time{color:var(--accent);font-size:.82em;font-weight:550;letter-spacing:-.5px}
.usage{width:100%;max-width:760px;margin:0 auto;padding:20px 24px 48px;font-size:14px;line-height:1.85;color:#515b50}.usage details{border-top:1px solid var(--line);padding-top:18px}.usage summary{cursor:pointer;color:#73836e;font-size:12px;list-style-position:inside;min-height:44px;display:list-item;padding:10px 0}.usage summary:hover{color:var(--accent)}.usage summary:focus-visible{outline:3px solid #38755c55;outline-offset:5px;border-radius:4px}.usage-content{padding:0 0 12px}.usage h2{font-size:19px;line-height:1.6;color:var(--ink);margin:14px 0}.usage h3{font-size:15px;color:var(--ink);margin:24px 0 8px}.usage p{margin:8px 0 14px}.usage ol{padding-left:22px;margin:8px 0 14px}.usage li{padding-left:2px;margin:6px 0}@media(max-width:600px){.usage{font-size:13px;padding-inline:24px}.usage h2{font-size:17px}.usage h3{font-size:14px}}