/* 켜둠 — 책상 위 기기처럼: 케이스, 면, 숫자 */

:root {
  --casing: #E4E7E4;
  --face: #F7F8F6;
  --ink: #1C2023;
  --ink-2: #5E666C;
  --line: #C9CEC9;
  --well: #ECEEEB;
  --dial: #2747C9;
  --red: #D9412B;
  --rest: #2B8A5E;
  --on-ink: #F7F8F6;

  --num: "Archivo", "Pretendard Variable", system-ui, sans-serif;
  --ui: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;

  --s-1: 0.8125rem;
  --s0: 1rem;
  --s1: 1.25rem;
  --s2: 1.5625rem;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --casing: #121518;
    --face: #1A1E22;
    --ink: #E6EAE8;
    --ink-2: #98A1A7;
    --line: #2D3338;
    --well: #22272C;
    --dial: #8199FF;
    --red: #FF6B55;
    --rest: #4CC08A;
    --on-ink: #121518;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --casing: #121518;
  --face: #1A1E22;
  --ink: #E6EAE8;
  --ink-2: #98A1A7;
  --line: #2D3338;
  --well: #22272C;
  --dial: #8199FF;
  --red: #FF6B55;
  --rest: #4CC08A;
  --on-ink: #121518;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--casing);
  color: var(--ink);
  font-family: var(--ui);
  font-size: var(--s0);
  line-height: 1.6;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--dial); outline-offset: 2px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- 상단 바 ---------- */
.bar {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: var(--s1);
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
  flex: none;
}
.brand svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }

.tabs {
  display: flex;
  gap: 4px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  flex: none;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--ink-2);
  font-weight: 500;
  white-space: nowrap;
}
.tabs a:hover { color: var(--ink); }
.tabs a[aria-selected="true"] {
  color: var(--ink);
  background: var(--face);
  box-shadow: inset 0 0 0 1px var(--line);
}

.bar-actions { display: flex; gap: 8px; flex: none; }

.chip {
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: var(--s-1);
  color: var(--ink-2);
  white-space: nowrap;
}
.chip:hover { color: var(--ink); border-color: var(--ink-2); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }

/* ---------- 프레임 (광고 레일은 실제 광고가 있을 때만) ---------- */
.frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 광고 칸: 주석 처리된 ins 만 있으면 자리도 차지하지 않음. ins.adsbygoogle 을 풀면 나타남 */
.ad { display: none; }
.ad-inline:has(ins.adsbygoogle) { display: block; }

@media (min-width: 1200px) {
  .frame:has(.ad-side ins.adsbygoogle) { grid-template-columns: 160px minmax(0, 1fr) 160px; gap: 40px; }
  .ad-side:has(ins.adsbygoogle) { display: block; }
  .ad-side .ad-slot { position: sticky; top: 24px; }
  /* 레일이 있으면 본문 광고는 생략 */
  .frame:has(.ad-side ins.adsbygoogle) .ad-inline { display: none; }
}

.ad-slot { overflow: hidden; }
.ad-160 { width: 160px; min-height: 600px; }
/* 버튼과 충분히 떨어지도록 설명 글 아래에 크게 띄움 */
.ad-inline { min-height: 100px; margin: 96px 0 0; }

main { min-width: 0; padding-bottom: 48px; }

.intro {
  margin: 8px 0 16px;
  font-size: var(--s-1);
  font-weight: 500;
  color: var(--ink-2);
}

/* ---------- 기기 화면 ---------- */
.stage {
  position: relative;
  background: var(--face);
  border: 1px solid var(--line);
  border-radius: 28px;
  min-height: 560px;
  display: flex;
  padding: 48px 32px 32px;
}
.tool {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-width: 0;
}

.fs-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--ink-2);
  z-index: 2;
}
.fs-btn:hover { background: var(--well); color: var(--ink); }
.fs-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* 큰 숫자: 이 사이트의 얼굴 */
.readout {
  font-family: var(--num);
  font-stretch: 125%;
  font-weight: 250;
  font-variant-numeric: tabular-nums;
  font-size: clamp(3.5rem, 15vw, 11rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  white-space: nowrap;
}

/* 버튼 */
.controls { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.btn {
  border: 1px solid var(--line);
  background: var(--face);
  color: var(--ink);
  border-radius: 999px;
  padding: 10px 22px;
  font-weight: 600;
  min-height: 44px;
}
.btn:hover { border-color: var(--ink-2); }
.btn.primary { background: var(--ink); color: var(--on-ink); border-color: var(--ink); min-width: 120px; }
.btn.primary:hover { opacity: .88; }
.btn.small { padding: 6px 14px; min-height: 36px; font-size: var(--s-1); }
.btn.ghost { border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { color: var(--red); }
.btn.round { width: 44px; padding: 0; font-size: var(--s1); }

.seg {
  display: inline-flex;
  padding: 4px;
  background: var(--well);
  border-radius: 12px;
  gap: 2px;
}
.seg button {
  border: 0;
  background: transparent;
  padding: 8px 16px;
  border-radius: 9px;
  color: var(--ink-2);
  font-weight: 500;
}
.seg.small button { padding: 6px 12px; font-size: var(--s-1); }
.seg button[aria-pressed="true"] { background: var(--face); color: var(--ink); box-shadow: 0 0 0 1px var(--line); }

.opts { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 16px 24px; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: var(--s-1); color: var(--ink-2); cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--dial); margin: 0; }

input[type="number"], input[type="text"] {
  border: 1px solid var(--line);
  background: var(--face);
  border-radius: 8px;
  padding: 6px 10px;
  min-height: 36px;
}
input[type="number"] { width: 4.5em; text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- 뽀모도로 ---------- */
#tool-pomodoro { --state: var(--red); }
#tool-pomodoro[data-mode="short"], #tool-pomodoro[data-mode="long"] { --state: var(--rest); }
.pomo-time { color: var(--state); }
.pomo-bar {
  width: min(520px, 100%);
  height: 4px;
  border-radius: 2px;
  background: var(--well);
  overflow: hidden;
}
.pomo-bar i { display: block; height: 100%; background: var(--state); transform-origin: left; transform: scaleX(0); }
.pomo-round { margin: 0; font-size: var(--s-1); color: var(--ink-2); min-height: 1.6em; }

.settings { width: min(520px, 100%); font-size: var(--s-1); color: var(--ink-2); }
.settings summary { cursor: pointer; text-align: center; list-style: none; }
.settings summary::-webkit-details-marker { display: none; }
.settings summary:hover { color: var(--ink); }
.settings[open] summary { margin-bottom: 12px; }
.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; }
.fields label { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.fields .check { grid-column: 1 / -1; justify-content: flex-start; }

/* ---------- 공부 타이머 ---------- */
.study-subject { margin: 0; font-size: var(--s2); font-weight: 600; letter-spacing: -0.01em; }
.study-total { margin: 0; color: var(--ink-2); }
.study-total b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
#tool-study .study-time { font-size: clamp(2.75rem, 12vw, 9rem); }
#tool-study.running .study-time { color: var(--dial); }

.subjects { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; max-width: 640px; }
.subject {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.subject > button { border: 0; background: transparent; padding: 6px 4px 6px 12px; display: inline-flex; gap: 8px; align-items: baseline; }
.subject > button:last-child { padding: 6px 10px; color: var(--ink-2); }
.subject > button:last-child:hover { color: var(--red); }
.subject small { color: var(--ink-2); font-variant-numeric: tabular-nums; font-size: var(--s-1); }
.subject[aria-current="true"] { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.subject-add { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.subject-add input { width: 10em; }

/* ---------- 메트로놈 ---------- */
.metro { display: flex; align-items: center; justify-content: center; gap: clamp(24px, 6vw, 72px); flex-wrap: wrap; }
.metro-body { width: clamp(130px, 18vw, 190px); height: auto; overflow: visible; }
.metro-case { fill: var(--well); stroke: var(--line); stroke-width: 1.5; stroke-linejoin: round; }
.metro-scale { stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 2 8; }
.metro-arm { transform-origin: 100px 226px; transform-box: view-box; }
.metro-arm line { stroke: var(--ink); stroke-width: 3; stroke-linecap: round; }
.metro-weight { fill: var(--ink); }
.metro-pivot { fill: var(--ink); }
.metro-read { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.metro-name { margin: 0; color: var(--ink-2); display: flex; gap: 10px; align-items: baseline; }
.metro-name b { color: var(--ink); font-weight: 500; font-style: italic; font-size: var(--s1); }
.beat-dots { display: flex; gap: 10px; margin-top: 8px; min-height: 16px; }
.beat-dots i { width: 14px; height: 14px; border-radius: 50%; background: var(--well); box-shadow: inset 0 0 0 1px var(--line); transition: background .06s; }
.beat-dots i.accent { width: 16px; height: 16px; }
.beat-dots i.on { background: var(--dial); box-shadow: none; }
.beat-dots i.accent.on { background: var(--red); }

.metro-tempo { display: flex; align-items: center; gap: 12px; width: min(560px, 100%); }
.metro-tempo input { flex: 1; accent-color: var(--dial); }

/* ---------- 시계 ---------- */
.clock-date { margin: 0; font-size: var(--s1); color: var(--ink-2); }
.clock-time { display: flex; align-items: baseline; gap: 0.08em; font-size: clamp(3.5rem, 16vw, 13rem); }
.clock-ap { font-family: var(--ui); font-size: 0.16em; font-weight: 500; color: var(--ink-2); margin-right: 0.3em; letter-spacing: 0; }
.clock-s { font-size: 0.36em; color: var(--ink-2); margin-left: 0.12em; }

/* ---------- 플립 시계 ---------- */
.flipclock {
  --h: clamp(96px, 16vw, 200px);
  display: flex;
  gap: calc(var(--h) * 0.16);
  font-family: var(--num);
  font-stretch: 100%;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.flipclock.with-sec { --h: clamp(64px, 11vw, 170px); }
.flip-group { display: flex; gap: calc(var(--h) * 0.05); }
.flip {
  position: relative;
  width: calc(var(--h) * 0.68);
  height: var(--h);
  font-size: calc(var(--h) * 0.8);
  perspective: calc(var(--h) * 4);
  color: #EDEFEC;
}
.flip .half, .flip .flap {
  position: absolute;
  left: 0;
  right: 0;
  height: 50%;
  overflow: hidden;
  background: #24292D;
}
.flip .top, .flip .flap.front { top: 0; border-radius: calc(var(--h) * 0.07) calc(var(--h) * 0.07) 0 0; }
.flip .bottom, .flip .flap.back { bottom: 0; border-radius: 0 0 calc(var(--h) * 0.07) calc(var(--h) * 0.07); background: #2A3034; }
.flip b {
  display: block;
  height: var(--h);
  line-height: var(--h);
  text-align: center;
  font-weight: inherit;
}
.flip .bottom b, .flip .flap.back b { transform: translateY(-50%); }
/* 가운데 접힘선 */
.flip::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: max(2px, calc(var(--h) * 0.012));
  transform: translateY(-50%);
  background: var(--face);
  z-index: 3;
}
.flip .flap { z-index: 2; backface-visibility: hidden; }
.flip .flap.front { transform-origin: 50% 100%; }
.flip .flap.back { transform-origin: 50% 0; transform: rotateX(90deg); }
.flip.go .flap.front { animation: flap-down 0.3s ease-in forwards; }
.flip.go .flap.back { animation: flap-up 0.3s 0.3s ease-out forwards; }
.flip:not(.go) .flap { visibility: hidden; }
@keyframes flap-down { to { transform: rotateX(-90deg); } }
@keyframes flap-up { from { transform: rotateX(90deg); } to { transform: rotateX(0); } }
.flip-ap { margin: 0; color: var(--ink-2); font-size: var(--s1); min-height: 1.6em; }

/* ---------- 수업 타이머 ---------- */
.class-face { display: flex; align-items: center; justify-content: center; gap: clamp(24px, 5vw, 64px); flex-wrap: wrap; }
.disc { width: clamp(200px, 26vw, 300px); height: auto; }
.disc-plate { fill: var(--well); stroke: var(--line); stroke-width: 1; }
.disc-ticks line { stroke: var(--ink-2); stroke-width: 1.2; }
.disc-ticks line.major { stroke-width: 2.4; stroke: var(--ink); }
.disc-left { fill: var(--red); }
.disc-cap { fill: var(--face); stroke: var(--line); }
.class-read { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
.class-time { font-size: clamp(3.5rem, 11vw, 9rem); }
.class-msg { margin: 0; color: var(--ink-2); min-height: 1.6em; }
#tool-classroom[data-state="warn"] .class-time { color: var(--red); }
#tool-classroom[data-state="done"] .class-time { color: var(--red); animation: blink 1s steps(2, start) 6; }
#tool-classroom[data-state="done"] .class-msg { color: var(--red); font-weight: 600; }
@keyframes blink { to { visibility: hidden; } }
.presets { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.presets .chip { font-size: var(--s0); padding: 6px 14px; font-variant-numeric: tabular-nums; }
.custom { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 12px; font-size: var(--s-1); color: var(--ink-2); }
.custom label { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- 아래 설명 ---------- */
.keys { margin: 12px 4px 0; font-size: var(--s-1); color: var(--ink-2); }
.guide { max-width: 68ch; margin: 80px 4px 0; }
.guide + .guide { margin-top: 64px; }
.guide h2 { font-size: var(--s2); letter-spacing: -0.02em; line-height: 1.3; margin: 0 0 12px; }
.guide .lead { color: var(--ink-2); margin: 0; }
.guide article { margin-top: 40px; }
.guide h3 { font-size: var(--s1); letter-spacing: -0.01em; line-height: 1.4; margin: 0 0 8px; }
.faq h3 { font-size: var(--s0); margin-top: 28px; }
.guide p { margin: 0 0 12px; }
.guide ol, .guide ul { margin: 0 0 12px; padding-left: 1.4em; }
.guide ul { color: var(--ink-2); }
.guide li + li { margin-top: 4px; }
.guide a { color: var(--dial); }
.tempo { border-collapse: collapse; width: 100%; font-size: var(--s-1); font-variant-numeric: tabular-nums; }
.tempo th, .tempo td { text-align: left; padding: 8px 12px 8px 0; border-bottom: 1px solid var(--line); }
.tempo th { color: var(--ink-2); font-weight: 500; }
.tempo td[lang] { font-style: italic; font-weight: 500; }

.foot { max-width: 1400px; margin: 0 auto; padding: 24px; font-size: var(--s-1); color: var(--ink-2); border-top: 1px solid var(--line); }
.foot p { margin: 0; max-width: 68ch; }
.foot .foot-links { margin-top: 8px; }
.foot a { color: inherit; }

/* ---------- 전체화면 ---------- */
.stage.is-full {
  border: 0;
  border-radius: 0;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 32px;
}
.stage.is-full.pseudo { position: fixed; inset: 0; z-index: 100; }
.stage:fullscreen { width: 100%; height: 100%; }
.stage.is-full .readout { font-size: min(22vw, 42vh); }
.stage.is-full .study-time { font-size: min(15vw, 34vh); }
.stage.is-full .clock-time { font-size: min(24vw, 50vh); }
.stage.is-full .class-time { font-size: min(16vw, 30vh); }
.stage.is-full .disc { width: min(36vw, 62vh); }
.stage.is-full .flipclock { --h: min(26vw, 48vh); }
.stage.is-full .flipclock.with-sec { --h: min(18vw, 40vh); }
.stage.is-full .metro-body { width: min(24vw, 46vh); }
/* 전체화면에서 가만히 두면 조작부를 숨김 */
.stage.is-full .controls, .stage.is-full .opts, .stage.is-full .settings, .stage.is-full .seg,
.stage.is-full .subjects, .stage.is-full .subject-add, .stage.is-full .presets, .stage.is-full .custom,
.stage.is-full .metro-tempo, .stage.is-full .fs-btn { transition: opacity .4s; }
.stage.is-full.idle .controls, .stage.is-full.idle .opts, .stage.is-full.idle .settings, .stage.is-full.idle .seg,
.stage.is-full.idle .subjects, .stage.is-full.idle .subject-add, .stage.is-full.idle .presets, .stage.is-full.idle .custom,
.stage.is-full.idle .metro-tempo, .stage.is-full.idle .fs-btn { opacity: 0; pointer-events: none; }
.stage.is-full.idle { cursor: none; }

/* ---------- 좁은 화면 ---------- */
@media (max-width: 720px) {
  .bar { flex-wrap: wrap; gap: 8px 16px; padding: 12px 16px; }
  .bar-actions { margin-left: auto; }
  .tabs { order: 3; flex-basis: 100%; margin: 0 -16px; padding: 0 12px; }
  .frame { padding: 0 16px; }
  .stage { min-height: 480px; padding: 56px 16px 24px; border-radius: 20px; }
  .fields { grid-template-columns: minmax(0, 1fr); }
  .metro-read, .class-read { align-items: center; }
  /* 휴대폰 폭을 꽉 채우는 숫자 */
  .readout { font-size: 21vw; }
  #tool-study .study-time { font-size: 15vw; }
  .clock-time { font-size: 21vw; }
  .class-time { font-size: 20vw; }
  .metro-bpm { font-size: 18vw; }
  .flipclock { --h: min(140px, calc((100vw - 80px) / 3.1)); }
  .flipclock.with-sec { --h: calc((100vw - 80px) / 4.6); }
  .btn { padding: 10px 18px; }
  .btn.primary { min-width: 96px; }
  .foot { padding: 24px 16px; }
}

/* 터치 기기에는 키보드 안내가 필요 없음 */
@media (hover: none) {
  .keys { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .flip.go .flap { animation-duration: 0.01s !important; animation-delay: 0s !important; }
  #tool-classroom[data-state="done"] .class-time { animation: none; }
  .beat-dots i { transition: none; }
}