@font-face { font-family: SameTimer Public; src: url('https://cdn.sametimer.com/assets/07ca20566e7508f47efe/fonts/pretendard-400.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: SameTimer Public; src: url('https://cdn.sametimer.com/assets/07ca20566e7508f47efe/fonts/pretendard-600.woff2') format('woff2'); font-weight: 600; font-display: swap; }
@font-face { font-family: SameTimer Public; src: url('https://cdn.sametimer.com/assets/07ca20566e7508f47efe/fonts/pretendard-700.woff2') format('woff2'); font-weight: 700; font-display: swap; }
:root { color-scheme: dark; font-family: SameTimer Public, system-ui, sans-serif; background: #08090b; color: #f4f4f5; --muted: #98999f; --line: #26272d; --accent: #ff625a; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 1440px; min-height: 100svh; margin-inline: auto; padding: 32px clamp(22px, 5vw, 72px) 24px; display: flex; flex-direction: column; }
header { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
a { color: inherit; text-underline-offset: 4px; }
@keyframes brand-colon-blink { 0%, 35%, 100% { opacity: 1; } 50%, 85% { opacity: .2; } }
@media (prefers-reduced-motion: no-preference) {
  .brand .colon { animation: brand-colon-blink 1.5s ease-in-out infinite; }
}
.language-menu { position: relative; font-size: 12px; color: var(--muted); }
.language-menu summary { cursor: pointer; padding-block: 10px; list-style: none; }
.language-menu summary::-webkit-details-marker { display: none; }
.language-menu summary::after { content: ''; display: inline-block; width: 6px; height: 6px; border-inline-end: 1px solid; border-block-end: 1px solid; transform: translateY(-2px) rotate(45deg); margin-inline-start: 12px; }
.language-menu nav { position: absolute; inset-inline-end: 0; top: 100%; z-index: 2; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 16px; width: max-content; max-width: calc(100vw - 44px); padding: 12px 16px; border: 1px solid var(--line); border-radius: 4px; background: #101114; box-shadow: 0 12px 32px #0006; }
nav a { padding-block: 6px; overflow-wrap: anywhere; color: var(--muted); }
nav [aria-current] { color: #f4f4f5; text-decoration: none; }
article { flex: 1; padding-block: clamp(76px, 12vh, 132px) 32px; }
.hero { text-align: center; }
h1 { max-width: 1100px; margin: 0 auto; font-size: clamp(34px, 4.2vw, 56px); font-weight: 600; line-height: 1.3; letter-spacing: -.04em; overflow-wrap: anywhere; text-wrap: balance; }
:lang(ko) :is(h1, h2, .intro, .detail-intro, section p, li) { word-break: keep-all; overflow-wrap: anywhere; }
.intro { margin: 22px auto 0; max-width: 640px; color: var(--muted); font-size: clamp(15px, 1.5vw, 18px); line-height: 1.7; text-wrap: balance; }
.timer-preview { margin: 66px auto 52px; max-width: 720px; user-select: none; }
.timer-modes { display: flex; align-items: center; justify-content: center; gap: 16px; font: 600 18px/1.5 SameTimer Public, system-ui, sans-serif; color: #c2c3ca; letter-spacing: .06em; }
.timer-modes span { white-space: nowrap; }
.timer-modes i { color: #747680; font-style: normal; font-weight: 400; }
.timer-digits { display: flex; align-items: center; justify-content: center; gap: .11em; margin-top: 18px; font-size: clamp(58px, 11.5vw, 158px); font-weight: 600; line-height: 1.1; letter-spacing: -.055em; font-variant-numeric: tabular-nums; }
.digit-colon { display: flex; flex-direction: column; gap: .16em; margin: .025em .05em 0; }
.digit-colon i { display: block; width: .075em; height: .075em; background: currentColor; }
.start { display: inline-flex; align-items: center; justify-content: center; gap: 24px; max-width: 100%; padding: 16px 25px; border: 1px solid #f4f4f5; border-radius: 4px; background: #f4f4f5; color: #08090b; font-size: 14px; font-weight: 600; line-height: 1.5; text-decoration: none; transition: background .15s, border-color .15s; }
.start svg { flex-shrink: 0; }
[dir="rtl"] .start svg { transform: scaleX(-1); }
.start:hover { background: #d8d8dc; border-color: #d8d8dc; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.feature-details { margin-top: 32px; }
.feature-details > summary { width: fit-content; max-width: 100%; margin: 0 auto; padding: 12px 16px; display: flex; align-items: center; justify-content: center; gap: 12px; border: 1px solid var(--line); border-radius: 4px; background: #101114; color: #c2c3ca; font-size: 13px; line-height: 1.5; cursor: pointer; list-style: none; transition: border-color .15s, background .15s; }
.feature-details > summary:hover, .feature-details[open] > summary { border-color: #5c5e68; background: #17181d; color: #f4f4f5; }
.feature-toggle-icon { flex-shrink: 0; color: var(--muted); }
.feature-details > summary::-webkit-details-marker { display: none; }
.disclosure-mark { position: relative; display: inline-block; width: 10px; height: 10px; flex-shrink: 0; }
.disclosure-mark::before, .disclosure-mark::after { content: ''; position: absolute; background: currentColor; }
.disclosure-mark::before { height: 1px; width: 10px; top: 4px; left: 0; }
.disclosure-mark::after { height: 10px; width: 1px; left: 4px; top: 0; }
.feature-details[open] .disclosure-mark::after { display: none; }
.detail-content { max-width: 960px; margin: 64px auto 0; padding-top: 32px; border-top: 1px solid var(--line); }
.detail-intro { max-width: 680px; margin: 0 0 36px; font-size: 17px; line-height: 1.8; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 56px; }
.feature-visual { margin: 0 0 24px; border-block: 1px solid var(--line); background: #0d0e11; overflow: hidden; user-select: none; }
.feature-visual svg { display: block; width: 100%; height: auto; }
.visual-line { stroke: #b4b6bf; stroke-width: 1.5; stroke-linecap: square; stroke-linejoin: round; }
.visual-muted { stroke: #555761; }
.visual-time { fill: #ededf0; font-family: SameTimer Public, system-ui, sans-serif; font-size: 28px; font-weight: 600; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.visual-dim { fill: #a2a4ae; }
.visual-small { font-size: 18px; }
.visual-tiny { font-size: 11px; }
.visual-message { fill: #ededf0; font-size: 48px; font-weight: 600; }
.visual-track { stroke: #30323b; stroke-width: 3; }
.visual-accent { stroke: var(--accent); stroke-width: 3; }
.visual-accent-fill { fill: var(--accent); }
.visual-muted-fill { fill: #555761; }
.visual-paper { fill: #ededf0; }
.visual-ink { fill: #17181c; }
.feature-details[open] .visual-sync { animation: feature-sync 2.4s ease-in-out 2; }
.feature-details[open] .visual-sound { animation: feature-sync 2.4s ease-in-out 2; }
@keyframes feature-sync { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
section { min-width: 0; }
h2 { margin: 0 0 12px; font-size: 20px; font-weight: 600; line-height: 1.5; letter-spacing: -.02em; }
section p, li { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.85; overflow-wrap: anywhere; }
.how { border-top: 1px solid var(--line); margin-top: 40px; padding-top: 28px; }
ol { padding-inline-start: 22px; margin: 0 0 20px; }
li { padding-inline-start: 4px; margin-block: 6px; }
footer { display: flex; justify-content: space-between; align-items: center; gap: 20px; color: #72737b; font-size: 11px; line-height: 1.5; }
footer a { text-decoration: none; }
footer a:hover { color: #c8c8cd; text-decoration: underline; }
@media (max-width: 600px) {
  main { padding-top: 22px; padding-bottom: 20px; }
  .language-menu { font-size: 11px; }
  .language-menu summary { font-size: 0; }
  .language-menu bdi { font-size: 11px; }
  article { padding-block: 88px 60px; }
  h1 { max-width: 18ch; line-height: 1.35; }
  .intro { margin-top: 18px; max-width: 100%; }
  .timer-preview { margin-block: 52px 40px; }
  .timer-digits { font-size: clamp(48px, 13.5vw, 80px); gap: .12em; margin-top: 16px; }
  .timer-modes { gap: clamp(5px, 1.8vw, 10px); font-size: clamp(14px, 3.8vw, 15px); letter-spacing: .02em; }
  .start { gap: 18px; padding: 14px 20px; font-size: 13px; }
  .feature-details { margin-top: 24px; }
  .detail-content { margin-top: 36px; padding-top: 24px; }
  .features { grid-template-columns: 1fr; gap: 28px; }
  .detail-intro { font-size: 15px; }
  footer { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) { .start, .feature-details > summary { transition: none; } .feature-details[open] .visual-sync, .feature-details[open] .visual-sound { animation: none; } }