/* style.css — Fubuki 吹雪 · encre & papier (sumi-e / washi) */

/* ----------------------------------------------------------------- Tokens */
:root {
  --cell: clamp(58px, 18vw, 92px);
  --gap: clamp(7px, 1.8vw, 12px);

  /* Palette encre japonaise */
  --paper: #ece2cd;          /* washi crème */
  --paper-2: #e3d6ba;        /* renfoncement papier */
  --paper-edge: #d8c8a6;
  --desk: #cdbb93;           /* surface sous la feuille (contraste du déchirement) */
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
  --ink: #243240;            /* sumi / encre indigo foncée */
  --ink-soft: rgba(36, 50, 64, 0.55);
  --ink-faint: rgba(36, 50, 64, 0.16);
  --indigo: #2c4a6b;         /* 藍 ai */
  --vermilion: #b8402f;      /* 朱 sceau */
  --vermilion-wash: rgba(184, 64, 47, 0.12);
  --jade: #4f7a5e;           /* validation calme */
  --jade-wash: rgba(79, 122, 94, 0.16);

  --shadow: 0 10px 30px rgba(60, 45, 20, 0.18);
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Songti SC",
           "Noto Serif JP", Georgia, "Times New Roman", serif;
}

body[data-theme='dark'] {
  /* Nuit d'encre */
  --paper: #1e2228;
  --paper-2: #262b33;
  --paper-edge: #11141a;
  --desk: #14171c;           /* bureau sombre sous la feuille */
  --ink: #ece3d0;            /* encre claire sur sumi */
  --ink-soft: rgba(236, 227, 208, 0.55);
  --ink-faint: rgba(236, 227, 208, 0.14);
  --indigo: #84b0d6;
  --vermilion: #e0644f;
  --vermilion-wash: rgba(224, 100, 79, 0.16);
  --jade: #86b394;
  --jade-wash: rgba(134, 179, 148, 0.18);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

/* ------------------------------------------------------------------ Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: var(--serif);
  color: var(--ink);
  background-color: var(--desk);
  /* Grain sur la surface du bureau */
  background-image: var(--grain);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow-x: hidden;
  transition: background-color 0.6s ease, color 0.6s ease;
  -webkit-tap-highlight-color: transparent;
}

/* -------------------------------------------------------------- Neige ❄ */
.snow { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.snow span {
  position: absolute;
  top: -5vh;
  color: var(--indigo);
  opacity: 0.18;
  font-size: clamp(10px, 2vw, 18px);
  animation-name: snowfall;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes snowfall {
  0% { transform: translateY(-5vh) translateX(0) rotate(0deg); opacity: 0; }
  10% { opacity: 0.2; }
  50% { transform: translateY(50vh) translateX(22px) rotate(180deg); }
  90% { opacity: 0.2; }
  100% { transform: translateY(108vh) translateX(-10px) rotate(360deg); opacity: 0; }
}

/* -------------------------------------------------------------------- App */
.app {
  position: relative;
  z-index: 1;
  width: min(440px, 100%);
  padding: clamp(22px, 5.5vw, 34px);
  background: transparent;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
/* Feuille de washi aux bords déchirés : couche papier séparée, déformée par
   le filtre SVG #deckle. Le contenu (au-dessus) reste net. */
.app::before {
  content: "";
  position: absolute;
  inset: -9px;
  z-index: -1;
  background-color: var(--paper);
  background-image: var(--grain);
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  box-shadow: var(--shadow);
  filter: url(#deckle);
}
/* Léger liseré d'encre intérieur (lui aussi déchiré) */
.app::after {
  content: "";
  position: absolute;
  inset: -2px;
  z-index: -1;
  border: 1px solid var(--ink-faint);
  border-radius: 3px;
  filter: url(#deckle2);
  pointer-events: none;
}

/* ---------------------------------------------------------------- Header */
.app-header { display: flex; align-items: flex-end; justify-content: space-between; }
.logo { display: flex; flex-direction: column; line-height: 1; }
.logo .kanji {
  font-size: clamp(30px, 9vw, 44px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 2px;
}
.logo .romaji {
  font-size: clamp(11px, 3vw, 13px);
  letter-spacing: 6px;
  color: var(--vermilion);
  margin-top: 5px;
  padding-left: 3px;
}
.header-actions { display: flex; gap: 8px; }

.icon-btn {
  width: 38px; height: 38px;
  border-radius: 2px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.12s;
}
.icon-btn:hover { background: var(--ink); color: var(--paper); }
.icon-btn:active { transform: translateY(1px); }

/* ------------------------------------------------------------ Difficulté */
.difficulty {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-bottom: 1.5px solid var(--ink-faint);
}
.diff-btn {
  position: relative;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  padding: 9px 4px;
  font-family: var(--serif);
  font-size: clamp(12px, 3.4vw, 14px);
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: color 0.2s;
}
.diff-btn:hover { color: var(--ink); }
.diff-btn.active { color: var(--ink); }
/* Trait de pinceau vermillon sous l'onglet actif */
.diff-btn.active::after {
  content: "";
  position: absolute;
  left: 14%; right: 14%; bottom: -1.5px;
  height: 3px;
  background: var(--vermilion);
  border-radius: 2px 6px 3px 5px / 4px 3px 5px 2px;
}

/* ------------------------------------------------------------------- HUD */
.hud { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 4px 2px;
  border-right: 1px solid var(--ink-faint);
}
.hud-item:last-child { border-right: none; }
.hud-label {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.hud-value { font-size: clamp(15px, 4.4vw, 19px); font-weight: 700; color: var(--ink); }

/* ----------------------------------------------------------------- Board */
.board-wrap { display: flex; justify-content: center; padding: 4px 0; }
.board {
  display: grid;
  grid-template-columns: repeat(3, var(--cell)) auto;
  grid-template-rows: repeat(3, var(--cell)) auto;
  gap: var(--gap);
}
.board.enter { animation: boardIn 0.5s ease; }
@keyframes boardIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.cell {
  font-family: var(--serif);
  font-size: calc(var(--cell) * 0.5);
  font-weight: 600;
  color: var(--ink);
  border: 1.5px solid var(--ink);
  background: var(--paper);
  border-radius: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: background 0.18s, color 0.18s, box-shadow 0.2s, transform 0.1s;
}
.cell:hover { background: var(--paper-2); }
.cell.filled { background: var(--paper-2); }

/* Case sélectionnée : sceau vermillon */
.cell.selected {
  border-color: var(--vermilion);
  box-shadow: inset 0 0 0 1.5px var(--vermilion);
  background: var(--vermilion-wash);
}

/* Indices de départ : encre pleine, marqués d'un point d'encre */
.cell.given {
  background: var(--paper-2);
  font-weight: 800;
  cursor: not-allowed;
}
.cell.given::before {
  content: "";
  position: absolute;
  top: 6px; left: 7px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--ink);
  opacity: 0.5;
}
/* Cases révélées : encre vermillon, comme une correction au sceau */
.cell.revealed {
  color: var(--vermilion);
  cursor: not-allowed;
}
.cell.revealed::before {
  content: "朱";
  position: absolute;
  top: 3px; right: 5px;
  font-size: 11px;
  color: var(--vermilion);
  opacity: 0.7;
}

.cell.shake { animation: shake 0.4s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* Sommes : nombres cerclés à l'encre */
.sum {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-weight: 700;
  font-size: calc(var(--cell) * 0.34);
  color: var(--ink);
  min-width: calc(var(--cell) * 0.72);
  border: 1.5px solid var(--ink-soft);
  border-radius: 50%;
  aspect-ratio: 1 / 1;
  background: transparent;
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.sum-row { justify-self: center; align-self: center; }
.sum-col { justify-self: center; align-self: center; }
.sum.ok { color: var(--jade); border-color: var(--jade); background: var(--jade-wash); }
.sum.bad { color: var(--vermilion); border-color: var(--vermilion); background: var(--vermilion-wash); }
.sum-corner {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell) * 0.26);
  color: var(--ink-soft);
  opacity: 0.6;
}

/* ---------------------------------------------------------------- Numpad */
.numpad { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.num {
  aspect-ratio: 1 / 1;
  font-family: var(--serif);
  border: 1.5px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  font-size: clamp(18px, 5vw, 22px);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, opacity 0.2s, transform 0.1s;
}
.num:hover { background: var(--ink); color: var(--paper); }
.num:active { transform: translateY(1px); }
.num.used { opacity: 0.3; }
.num.erase { border-style: dashed; color: var(--vermilion); border-color: var(--vermilion); }
.num.erase:hover { background: var(--vermilion); color: var(--paper); }

/* --------------------------------------------------------------- Actions */
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.action-btn {
  flex: 1 1 auto;
  min-width: 64px;
  padding: 12px 10px;
  font-family: var(--serif);
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  border-radius: 2px;
  font-size: clamp(13px, 3.6vw, 15px);
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, transform 0.1s;
}
.action-btn:hover { background: var(--ink); color: var(--paper); }
.action-btn:active { transform: translateY(1px); }
.action-btn.small { flex: 0 0 auto; min-width: 46px; font-size: 17px; padding: 12px; }

/* Bouton "sceau" : action principale, comme apposer un cachet rouge */
.action-btn.seal {
  background: var(--vermilion);
  border-color: var(--vermilion);
  color: #f6efe0;
  box-shadow: 0 3px 0 0 rgba(120, 35, 25, 0.35);
}
.action-btn.seal:hover { background: var(--ink); border-color: var(--ink); }
.action-btn.big { width: 100%; padding: 14px; font-size: 16px; }

/* --------------------------------------------------------------- Message */
.message {
  text-align: center;
  min-height: 20px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
}
.message.info { color: var(--indigo); }
.message.warn { color: var(--ink-soft); }
.message.error { color: var(--vermilion); }

/* ---------------------------------------------------------------- Modale */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 16, 8, 0.45);
  padding: 20px;
}
.modal-overlay.hidden { display: none; }
.modal {
  position: relative;
  width: min(340px, 100%);
  padding: 32px 28px 28px;
  background: transparent;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
  animation: pop 0.4s cubic-bezier(0.2, 0.9, 0.3, 1.3);
}
.modal::before {
  content: "";
  position: absolute;
  inset: -8px;
  z-index: -1;
  background-color: var(--paper);
  background-image: var(--grain);
  border: 1.5px solid var(--ink);
  border-radius: 3px;
  box-shadow: var(--shadow);
  filter: url(#deckle2);
}
@keyframes pop {
  from { opacity: 0; transform: scale(0.9) translateY(14px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
/* Grand sceau vermillon */
.seal-stamp {
  width: 64px; height: 64px;
  margin: 0 auto 4px;
  display: flex; align-items: center; justify-content: center;
  font-size: 34px;
  color: #f6efe0;
  background: var(--vermilion);
  border-radius: 8px;
  box-shadow: inset 0 0 0 3px rgba(246, 239, 224, 0.35);
  transform: rotate(-4deg);
}
.win-title { font-size: 24px; font-weight: 700; letter-spacing: 1px; }
.win-line { color: var(--ink-soft); font-size: 15px; }
.win-line strong { color: var(--ink); font-size: 17px; }
.win-record {
  color: var(--vermilion);
  font-weight: 700;
  letter-spacing: 1px;
  border: 1.5px dashed var(--vermilion);
  border-radius: 2px;
  padding: 5px 8px;
}
.hidden { display: none; }

/* ------------------------------------------------------------- Confettis */
.confetti-canvas { position: fixed; inset: 0; z-index: 15; pointer-events: none; }

/* ------------------------------------------------------------ Responsive */
@media (max-width: 360px) {
  :root { --cell: clamp(48px, 20vw, 70px); }
  .hud-value { font-size: 14px; }
  .hud-label { font-size: 9px; letter-spacing: 1px; }
}