:root {
  --sudewku-ink: #17321f;
  --sudewku-muted: #617267;
  --sudewku-line: #bdcbbf;
  --sudewku-strong-line: #285d37;
  --sudewku-soft: #edf7ef;
  --sudewku-selected: #d7f2df;
  --sudewku-peer: #f2f8f3;
  --sudewku-user: #1769aa;
  --sudewku-danger: #b42318;
}

.sudewku-page { min-height: 100dvh; margin: 0; color: var(--sudewku-ink); background: linear-gradient(180deg, #f8fbf8 0%, #eef6ef 55%, #e6f0e7 100%); overflow-x: hidden; }
.sudewku-shell { position: relative; z-index: 1; width: min(100% - 24px, 700px); margin: 0 auto; padding: max(14px, env(safe-area-inset-top)) 0 calc(28px + env(safe-area-inset-bottom)); }
.sudewku-topbar { min-height: 48px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; }
.sudewku-back, .sudewku-top-action { min-height: 44px; display: inline-flex; align-items: center; border: 0; background: transparent; color: #185b2a; font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; }
.sudewku-top-action { justify-self: end; padding: 0 8px; }
.sudewku-brand { display: inline-flex; gap: 7px; align-items: center; font-size: 0.96rem; }
.sudewku-intro { text-align: center; padding: 12px 10px 16px; }
.sudewku-intro .step-label { margin-bottom: 4px; }
.sudewku-intro h1 { margin: 0; font-size: clamp(2rem, 9vw, 3.2rem); letter-spacing: -0.04em; }
.sudewku-intro p:last-child { max-width: 520px; margin: 8px auto 0; color: var(--sudewku-muted); line-height: 1.45; }
.sudewku-game { padding: 14px; border: 1px solid rgba(37, 86, 49, 0.14); border-radius: 26px; background: rgba(255, 255, 255, 0.91); box-shadow: 0 18px 48px rgba(32, 76, 43, 0.12); backdrop-filter: blur(12px); }
.sudewku-daily-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px 14px; align-items: center; margin-bottom: 12px; padding: 11px 13px; border: 1px solid #dce9de; border-radius: 16px; background: linear-gradient(135deg, #f3fbf4, #e9f6ec); }
.sudewku-daily-card span, .sudewku-daily-card strong { display: block; }
.sudewku-daily-kicker, .sudewku-daily-clock span { color: var(--sudewku-muted); font-size: 0.68rem; font-weight: 850; letter-spacing: 0.06em; text-transform: uppercase; }
.sudewku-daily-card strong { margin-top: 2px; }
.sudewku-daily-clock { text-align: right; }
.sudewku-daily-clock strong { font-variant-numeric: tabular-nums; }
.sudewku-refresh { grid-column: 1 / -1; min-height: 44px; border: 1px solid #4f9b63; border-radius: 12px; background: #dff3e4; color: #125325; font: inherit; font-weight: 850; cursor: pointer; }
.sudewku-refresh[hidden] { display: none; }
.sudewku-status { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-bottom: 12px; }
.sudewku-status > div { min-height: 48px; padding: 7px 5px; border: 1px solid #e1e9e2; border-radius: 13px; background: #fbfdfb; text-align: center; }
.sudewku-status span, .sudewku-status strong { display: block; }
.sudewku-status span { color: var(--sudewku-muted); font-size: 0.64rem; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; }
.sudewku-status strong { margin-top: 1px; font-size: 0.98rem; font-variant-numeric: tabular-nums; }
.sudewku-board { width: min(100%, 520px); aspect-ratio: 1; display: grid; grid-template-columns: repeat(9, 1fr); margin: 0 auto; overflow: hidden; border: 3px solid var(--sudewku-strong-line); border-radius: 9px; background: white; touch-action: manipulation; }
.sudewku-cell { position: relative; min-width: 0; min-height: 0; padding: 0; display: grid; place-items: center; border: 0; border-right: 1px solid var(--sudewku-line); border-bottom: 1px solid var(--sudewku-line); background: white; color: var(--sudewku-ink); font: inherit; font-size: clamp(1.05rem, 5.3vw, 1.7rem); font-weight: 700; line-height: 1; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.sudewku-cell[data-col="2"], .sudewku-cell[data-col="5"] { border-right: 2px solid var(--sudewku-strong-line); }
.sudewku-cell[data-row="2"], .sudewku-cell[data-row="5"] { border-bottom: 2px solid var(--sudewku-strong-line); }
.sudewku-cell[data-col="8"] { border-right: 0; }
.sudewku-cell[data-row="8"] { border-bottom: 0; }
.sudewku-cell.peer { background: var(--sudewku-peer); }
.sudewku-cell.same { background: #e6f4ea; }
.sudewku-cell.selected { z-index: 1; background: var(--sudewku-selected); box-shadow: inset 0 0 0 2px #4f9b63; }
.sudewku-cell.given { font-weight: 900; }
.sudewku-cell.user-value { color: var(--sudewku-user); }
.sudewku-cell.hinted-value { color: #7c3aed; }
.sudewku-cell.mistake-flash { color: var(--sudewku-danger); background: #fee4e2; animation: sudewku-shake 180ms ease-in-out 2; }
.sudewku-cell:focus-visible { z-index: 3; outline: 3px solid #1f7a38; outline-offset: -3px; }
.sudewku-cell-notes { width: 100%; height: 100%; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); padding: 2px; color: #4e6b56; font-size: clamp(0.4rem, 1.9vw, 0.67rem); font-weight: 700; line-height: 1; }
.sudewku-cell-notes span { display: grid; place-items: center; }
.sudewku-message { min-height: 22px; margin: 9px 4px 7px; color: var(--sudewku-muted); font-size: 0.86rem; font-weight: 700; text-align: center; }
.sudewku-message.is-warning { color: var(--sudewku-danger); }
.sudewku-message.is-success { color: #14752d; }
.sudewku-number-pad { display: grid; grid-template-columns: repeat(9, 1fr); gap: 5px; margin-top: 4px; }
.sudewku-number-pad button { min-width: 0; min-height: 48px; border: 1px solid #d3e1d5; border-radius: 11px; background: var(--sudewku-soft); color: #185b2a; font: inherit; font-size: clamp(1rem, 4.5vw, 1.35rem); font-weight: 900; cursor: pointer; transition: opacity 120ms ease, transform 120ms ease; }
.sudewku-number-pad button:active { transform: translateY(1px); }
.sudewku-number-pad button:disabled, .sudewku-number-pad button.is-complete { opacity: 0.3; text-decoration: line-through; cursor: default; }
.sudewku-tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-top: 9px; }
.sudewku-tools button { min-width: 0; min-height: 58px; display: grid; place-items: center; gap: 1px; padding: 5px 3px; border: 1px solid #dce7dd; border-radius: 13px; background: white; color: #314b38; font: inherit; cursor: pointer; }
.sudewku-tools button span { font-size: 1.05rem; }
.sudewku-tools button strong { font-size: 0.72rem; }
.sudewku-tools button[aria-pressed="true"] { border-color: #60a873; background: #dff3e4; color: #125325; }
.sudewku-tools button:disabled { opacity: 0.42; cursor: default; }
.sudewku-help { margin: 14px 4px 0; padding: 12px 14px; border: 1px solid rgba(37, 86, 49, 0.13); border-radius: 16px; background: rgba(255, 255, 255, 0.68); color: var(--sudewku-muted); }
.sudewku-help summary { color: #284b31; font-weight: 850; cursor: pointer; }
.sudewku-help p { margin: 10px 0 0; line-height: 1.5; }
.sudewku-keyboard-help { font-size: 0.88rem; }
.sudewku-win-dialog { width: min(90vw, 430px); max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px); padding: 26px; border: 0; border-radius: 24px; color: var(--sudewku-ink); background: #fff; box-shadow: 0 24px 80px rgba(14, 43, 22, 0.28); text-align: center; }
.sudewku-win-dialog::backdrop { background: rgba(20, 42, 25, 0.48); backdrop-filter: blur(4px); }
.sudewku-win-badge { font-size: 2rem; }
.sudewku-win-dialog h2 { margin: 3px 0 8px; font-size: 1.8rem; }
.sudewku-win-dialog p { color: var(--sudewku-muted); }
.sudewku-win-actions { display: grid; gap: 8px; margin-top: 18px; }
.sudewku-win-actions .button { min-height: 46px; }
@keyframes sudewku-shake { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(2px); } }
@media (max-width: 430px) {
  .sudewku-shell { width: min(100% - 16px, 700px); }
  .sudewku-intro { padding-top: 8px; padding-bottom: 11px; }
  .sudewku-intro p:last-child { font-size: 0.88rem; }
  .sudewku-game { padding: 10px; border-radius: 21px; }
  .sudewku-daily-card { padding: 10px; }
  .sudewku-status { gap: 5px; }
  .sudewku-status > div { min-height: 46px; padding-inline: 3px; }
  .sudewku-number-pad { gap: 3px; }
  .sudewku-number-pad button { min-height: 44px; border-radius: 9px; }
  .sudewku-tools { gap: 5px; }
}
@media (max-width: 360px) { .sudewku-status { grid-template-columns: repeat(2, 1fr); } .sudewku-status > div { min-height: 43px; } }
@media (max-width: 340px) { .sudewku-brand { font-size: 0.86rem; } .sudewku-game { padding-inline: 6px; } .sudewku-number-pad button { min-height: 41px; } .sudewku-tools button { min-height: 54px; } }
@media (prefers-reduced-motion: reduce) { .sudewku-cell.mistake-flash { animation: none; } .sudewku-number-pad button { transition: none; } }