:root {
  color-scheme: dark;
  --bg: #0d0f12;
  --surface: #171a1f;
  --surface-2: #20242b;
  --line: #303640;
  --text: #f6f7f9;
  --muted: #9ca5b3;
  --accent: #72e3a6;
  --danger: #ff6b75;
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--text); }
body { min-height: 100dvh; }
button, input, textarea { font: inherit; }
button { touch-action: manipulation; }

.app-shell {
  width: min(100%, 430px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(12px, env(safe-area-inset-top)) 16px max(14px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.topbar { min-height: 42px; display: flex; align-items: center; justify-content: space-between; }
.topbar h1 { margin: 0; font-size: 18px; letter-spacing: -.02em; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.nav-link { color: var(--muted); text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.nav-link:hover { color: var(--text); }

.video-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 18px;
  background: #050607;
  border: 1px solid var(--line);
  cursor: pointer;
}
.video-frame video { width: 100%; height: 100%; display: block; object-fit: contain; }
.no-video { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font-size: 16px; }
.no-video[hidden] { display: none; }
.video-hint { position: absolute; inset: auto 12px 10px; text-align: center; color: #fff; font-size: 12px; text-shadow: 0 1px 5px #000; pointer-events: none; }

.sentence-card { flex: 1; min-height: 118px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); padding: 22px 20px; display: grid; place-items: center; }
.sentence { margin: 0; width: 100%; text-align: center; white-space: pre-wrap; overflow-wrap: anywhere; font-size: clamp(20px, 6vw, 28px); line-height: 1.45; font-weight: 700; letter-spacing: -.025em; }
.empty { color: var(--muted); font-size: 16px; font-weight: 500; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 10px 8px; text-align: center; }
.stat span { display: block; color: var(--muted); font-size: 11px; margin-bottom: 3px; }
.stat strong { font-size: 18px; }

.counter { display: grid; grid-template-columns: 1fr 1.55fr; gap: 10px; }
.count-button { min-height: 70px; border: 0; border-radius: 18px; background: var(--surface-2); color: var(--text); font-size: 34px; font-weight: 700; }
.count-button.plus { background: var(--accent); color: #092416; }
.count-button:disabled { opacity: .35; }

.primary, .secondary, .danger { border: 0; border-radius: 14px; min-height: 50px; padding: 0 18px; font-weight: 700; cursor: pointer; }
.primary { background: var(--accent); color: #092416; }
.secondary { background: var(--surface-2); color: var(--text); border: 1px solid var(--line); }
.danger { background: rgba(255,107,117,.14); color: var(--danger); border: 1px solid rgba(255,107,117,.34); }
.full { width: 100%; }
.message { min-height: 20px; margin: 0; color: var(--muted); text-align: center; font-size: 13px; }
.message.error { color: var(--danger); }

.upload-form { display: flex; flex: 1; flex-direction: column; gap: 14px; }
.dropzone { display: grid; place-items: center; min-height: 220px; padding: 20px; text-align: center; border: 2px dashed var(--line); border-radius: 20px; background: var(--surface); cursor: pointer; overflow: hidden; }
.dropzone.dragging { border-color: var(--accent); background: rgba(114,227,166,.08); }
.dropzone input { display: none; }
.dropzone video { max-width: 100%; max-height: 240px; border-radius: 12px; }
.drop-copy strong, .drop-copy span { display: block; }
.drop-copy strong { font-size: 18px; margin-bottom: 8px; }
.drop-copy span { color: var(--muted); font-size: 13px; }
.text-input { flex: 1; min-height: 150px; resize: none; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); color: var(--text); padding: 18px; font-size: 18px; line-height: 1.5; outline: none; }
.text-input:focus { border-color: var(--accent); }

.data-shell { width: min(100%, 720px); }
.data-list { display: flex; flex-direction: column; gap: 8px; padding-bottom: 20px; }
.data-row { width: 100%; min-height: 64px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; background: var(--surface); color: var(--text); text-align: left; }
.data-row .row-content { min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.data-row .row-text { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.data-row .row-content small { color: var(--muted); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.data-row .days { color: var(--muted); font-size: 13px; white-space: nowrap; }
.data-row.overdue .days { color: var(--danger); }

dialog { width: min(calc(100% - 28px), 520px); max-height: calc(100dvh - 28px); overflow-y: auto; border: 1px solid var(--line); border-radius: 22px; background: var(--surface); color: var(--text); padding: 20px; }
dialog::backdrop { background: rgba(0,0,0,.72); }
.dialog-form { display: flex; flex-direction: column; gap: 16px; }
.dialog-form textarea { width: 100%; min-height: 180px; resize: vertical; border: 1px solid var(--line); border-radius: 14px; background: var(--bg); color: var(--text); padding: 14px; line-height: 1.5; }
.video-picker { min-height: 52px; display: grid; place-items: center; border: 1px dashed var(--line); border-radius: 14px; background: var(--bg); color: var(--muted); cursor: pointer; padding: 10px; text-align: center; overflow-wrap: anywhere; }
.video-picker.dragging { border-color: var(--accent); background: rgba(114,227,166,.08); color: var(--text); }
.video-picker input { display: none; }
.drop-copy small { color: var(--muted); font-size: 12px; font-weight: 500; }
.round-control { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.round-control > span { color: var(--muted); font-size: 13px; }
.stepper { display: grid; grid-template-columns: 46px 76px 46px; align-items: center; text-align: center; }
.stepper button { min-height: 44px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); font-size: 22px; }
.stepper button:first-child { border-radius: 12px 0 0 12px; }
.stepper button:last-child { border-radius: 0 12px 12px 0; }
.stepper button:disabled { opacity: .35; }
.stepper strong { min-height: 44px; display: grid; place-items: center; border-block: 1px solid var(--line); font-size: 14px; }
.day-control { display: grid; grid-template-columns: 56px 1fr 56px; gap: 10px; align-items: center; }
.day-control button { min-height: 52px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface-2); color: var(--text); font-size: 24px; }
.day-value { text-align: center; }
.day-value strong { display: block; font-size: 26px; }
.day-value span { color: var(--muted); font-size: 12px; }
.dialog-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

@media (max-height: 740px) {
  .app-shell { gap: 8px; padding-top: max(8px, env(safe-area-inset-top)); }
  .topbar { min-height: 34px; }
  .sentence-card { min-height: 90px; padding: 14px; }
  .counter .count-button { min-height: 58px; }
}