/* =============================================
   球体設計図ジェネレーター — sphere.css
   国語辞典 × 測量設計図 世界観
   ============================================= */

/* ─── Custom Properties ─── */
:root {
  --clr-paper:      #f0e8cc;
  --clr-paper-dk:   #e4d8b0;
  --clr-paper-deep: #d8cb98;
  --clr-ink:        #1a120a;
  --clr-ink-mid:    #3a2c18;
  --clr-ink-light:  #6b5538;
  --clr-vermilion:  #c0392b;
  --clr-cobalt:     #1a4a7a;
  --clr-cobalt-lt:  rgba(26,74,122,0.12);
  --clr-gold:       #9a7a32;
  --clr-gold-lt:    rgba(154,122,50,0.12);
  --clr-rule:       #c0a870;
  --clr-rule-lt:    #d8c898;
  --clr-muted:      #a08060;

  /* 設計図セル色 */
  --clr-filled: #2e5c1a;       /* ブロックあり（森の緑） */
  --clr-filled-hi: #4a8a30;
  --clr-shell:  rgba(26,74,122,0.28);  /* 外壁（瑠璃色） */
  --clr-shell-border: rgba(26,74,122,0.55);
  --clr-grid-bg: #e8ddb8;      /* グリッド背景（古紙） */
  --clr-grid-line: rgba(139,110,60,0.18);

  --font-mincho: 'Noto Serif JP', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
  --font-mono:   'Courier New', 'Courier', monospace;

  --ease-book: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }

body {
  font-family: var(--font-mincho);
  background-color: var(--clr-paper);
  color: var(--clr-ink);
  min-height: 100svh;
  overflow-x: hidden;
  position: relative;
}

/* 横罫線テクスチャ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 27px,
    rgba(139,110,60,0.08) 27px,
    rgba(139,110,60,0.08) 28px
  );
  background-size: 100% 28px;
}

/* ─── ヘッダー ─── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--clr-ink);
  border-bottom: 3px solid var(--clr-vermilion);
  padding: clamp(0.6rem, 2vw, 1rem) clamp(1rem, 4vw, 2.5rem);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 3px 16px rgba(0,0,0,0.3);
}

header h1 {
  grid-column: 2;
  text-align: center;
  font-size: clamp(0.9rem, 2.5vw, 1.2rem);
  font-weight: 700;
  color: var(--clr-paper);
  letter-spacing: 0.2em;
}

.header-sub {
  grid-column: 2;
  text-align: center;
  font-size: clamp(0.55rem, 1vw, 0.68rem);
  color: var(--clr-rule);
  letter-spacing: 0.25em;
  margin-top: 0.15rem;
}

/* ヘッダー内レイアウト調整 */
header > * { grid-row: 1; }
header h1, header .header-sub { display: block; }

/* 縦並び用wrapper */
.header-center {
  grid-column: 2;
  text-align: center;
}
.header-center h1 {
  font-size: clamp(0.9rem, 2.5vw, 1.2rem);
  font-weight: 700;
  color: var(--clr-paper);
  letter-spacing: 0.2em;
  margin-bottom: 0.12rem;
}
.header-center .header-sub {
  font-size: clamp(0.55rem, 1vw, 0.65rem);
  color: var(--clr-rule);
  letter-spacing: 0.25em;
}

.home-btn {
  grid-column: 1;
  font-size: clamp(0.6rem, 1.1vw, 0.72rem);
  color: var(--clr-rule);
  text-decoration: none;
  border: 1px solid var(--clr-rule);
  border-radius: 2rem;
  padding: 0.28em 0.75em;
  white-space: nowrap;
  transition: background 0.18s, color 0.18s;
  letter-spacing: 0.06em;
}
.home-btn:hover {
  background: var(--clr-rule);
  color: var(--clr-ink);
}

/* ─── メインレイアウト ─── */
main {
  position: relative;
  z-index: 1;
  max-width: 56rem;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 1.75rem) clamp(0.75rem, 3vw, 1.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

/* ─── 共通カード ─── */
.controls-card,
.view-card {
  background: var(--clr-paper);
  border: 1px solid var(--clr-rule);
  padding: clamp(0.85rem, 2.5vw, 1.4rem) clamp(0.9rem, 2.5vw, 1.5rem);
}

/* カード内セクション区切り */
.controls-card::before,
.view-card::before {
  content: '';
  display: none; /* 横罫は body::before で全体に適用済み */
}

/* ─── コントロール行 ─── */
.ctrl-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  align-items: flex-end;
  margin-bottom: 1rem;
}

.ctrl-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.ctrl-label {
  font-size: clamp(0.58rem, 1vw, 0.68rem);
  color: var(--clr-gold);
  letter-spacing: 0.25em;
  font-weight: 700;
}

/* ─── インプット行 ─── */
.input-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

input[type="number"] {
  width: 4.5rem;
  padding: 0.38rem 0.5rem;
  background: var(--clr-paper);
  border: 1px solid var(--clr-rule);
  border-radius: 3px;
  color: var(--clr-ink);
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 1.6vw, 1rem);
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}
input[type="number"]:focus {
  border-color: var(--clr-cobalt);
  box-shadow: 0 0 0 2px var(--clr-cobalt-lt);
}

.stepper {
  width: 1.85rem;
  height: 1.85rem;
  background: var(--clr-paper-dk);
  border: 1px solid var(--clr-rule);
  border-radius: 3px;
  color: var(--clr-ink-mid);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.stepper:hover  { background: var(--clr-paper-deep); }
.stepper:active { transform: scale(0.93); }

.apply-btn {
  padding: 0.38rem 1rem;
  background: var(--clr-cobalt);
  border: none;
  border-radius: 3px;
  color: var(--clr-paper);
  font-family: var(--font-mincho);
  font-size: clamp(0.65rem, 1.2vw, 0.75rem);
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.18s, transform 0.15s;
  letter-spacing: 0.1em;
}
.apply-btn:hover  { opacity: 0.85; }
.apply-btn:active { transform: scale(0.96); }

.hint {
  font-size: clamp(0.55rem, 0.95vw, 0.63rem);
  color: var(--clr-muted);
  letter-spacing: 0.05em;
}

/* ─── トグル（中実 / 空洞） ─── */
.toggle-row {
  display: flex;
  border: 1px solid var(--clr-rule);
  border-radius: 3px;
  overflow: hidden;
}

.toggle-btn {
  padding: 0.4em 1.1em;
  background: transparent;
  border: none;
  color: var(--clr-muted);
  font-family: var(--font-mincho);
  font-size: clamp(0.68rem, 1.2vw, 0.78rem);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.08em;
}
.toggle-btn.active {
  background: var(--clr-ink);
  color: var(--clr-paper);
  font-weight: 700;
}
.toggle-btn:not(.active):hover { color: var(--clr-ink-mid); }

/* ─── セルサイズスライダー ─── */
.slider-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

input[type="range"] {
  width: 6.5rem;
  accent-color: var(--clr-cobalt);
}

#cell-size-val {
  font-size: clamp(0.65rem, 1.1vw, 0.75rem);
  color: var(--clr-ink-mid);
  min-width: 2.2rem;
  font-family: var(--font-mono);
}

/* ─── 情報バー ─── */
.info-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  border-top: 1px dotted var(--clr-rule-lt);
  padding-top: 0.75rem;
}

.info-chip {
  font-size: clamp(0.62rem, 1.1vw, 0.72rem);
  padding: 0.22em 0.75em;
  background: var(--clr-paper-dk);
  border: 1px solid var(--clr-rule-lt);
  border-radius: 2rem;
  color: var(--clr-ink-light);
  letter-spacing: 0.05em;
}
.info-chip strong {
  color: var(--clr-cobalt);
  font-weight: 700;
}

/* ─── ビュータブ ─── */
.view-tabs {
  display: flex;
  border-bottom: 1px solid var(--clr-rule);
  margin-bottom: 1rem;
}

.view-tab {
  padding: 0.5em 1.1em;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--clr-muted);
  font-family: var(--font-mincho);
  font-size: clamp(0.72rem, 1.3vw, 0.82rem);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.1em;
}
.view-tab.active {
  color: var(--clr-cobalt);
  border-bottom-color: var(--clr-cobalt);
  font-weight: 700;
}
.view-tab:not(.active):hover { color: var(--clr-ink-mid); }

/* ─── サブタブ ─── */
.sub-tabs {
  display: flex;
  border: 1px solid var(--clr-rule);
  border-radius: 3px;
  overflow: hidden;
  width: fit-content;
  margin-bottom: 0.85rem;
}

.sub-tab {
  padding: 0.32em 0.9em;
  background: transparent;
  border: none;
  color: var(--clr-muted);
  font-family: var(--font-mincho);
  font-size: clamp(0.62rem, 1.1vw, 0.72rem);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.06em;
}
.sub-tab.active {
  background: var(--clr-ink);
  color: var(--clr-paper);
}
.sub-tab:not(.active):hover { color: var(--clr-ink-mid); }

/* ─── レイヤーナビ ─── */
.layer-nav {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.nav-btn {
  padding: 0.32em 0.9em;
  background: var(--clr-paper-dk);
  border: 1px solid var(--clr-rule);
  border-radius: 3px;
  color: var(--clr-ink-mid);
  font-size: clamp(0.7rem, 1.2vw, 0.78rem);
  cursor: pointer;
  transition: background 0.15s;
}
.nav-btn:hover:not(:disabled)  { background: var(--clr-paper-deep); }
.nav-btn:active:not(:disabled) { transform: scale(0.95); }
.nav-btn:disabled { opacity: 0.3; cursor: default; }

.layer-label {
  font-size: clamp(0.78rem, 1.5vw, 0.9rem);
  font-weight: 700;
  color: var(--clr-ink);
  min-width: 7rem;
  text-align: center;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.block-count {
  font-size: clamp(0.62rem, 1.1vw, 0.72rem);
  color: var(--clr-muted);
  letter-spacing: 0.04em;
}

/* ─── グリッド（設計図風） ─── */
.grid-wrap {
  overflow: auto;
  margin-bottom: 0.85rem;
  max-height: 62vh;
}

.grid-outer {
  display: inline-block;
  /* 設計図の用紙感：古紙色 + 薄い方眼 */
  background-color: var(--clr-grid-bg);
  background-image:
    repeating-linear-gradient(
      to right,
      var(--clr-grid-line) 0,
      var(--clr-grid-line) 1px,
      transparent 1px,
      transparent 100%
    ),
    repeating-linear-gradient(
      to bottom,
      var(--clr-grid-line) 0,
      var(--clr-grid-line) 1px,
      transparent 1px,
      transparent 100%
    );
  background-size: var(--cell-bg-sz, 18px) var(--cell-bg-sz, 18px);
  border: 2px solid var(--clr-rule);
  padding: 2px;
}

.grid-row { display: flex; }

/* セルサイズはJSでインラインstyleを使うため最小限のみ定義 */
.cell {
  image-rendering: pixelated;
  flex-shrink: 0;
}

/* 中実ブロック：墨色の方眼に緑 */
.cell.filled {
  background: var(--clr-filled);
  box-shadow:
    inset -1px -1px 0 rgba(0,0,0,0.3),
    inset 1px 1px 0 rgba(255,255,255,0.12);
}
.cell.filled:hover {
  background: var(--clr-filled-hi);
}

/* 外壁ブロック：瑠璃色の薄い枠 */
.cell.shell {
  background: var(--clr-shell);
  box-shadow:
    inset 0 0 0 1px var(--clr-shell-border);
}

.cell.empty { background: transparent; }

/* ─── 凡例 ─── */
.legend {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 0.5rem;
  border-top: 1px dotted var(--clr-rule-lt);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: clamp(0.62rem, 1.1vw, 0.72rem);
  color: var(--clr-muted);
  letter-spacing: 0.04em;
}

.lb {
  width: 0.88rem;
  height: 0.88rem;
  border-radius: 2px;
  flex-shrink: 0;
}
.lb-filled {
  background: var(--clr-filled);
  box-shadow: inset -1px -1px 0 rgba(0,0,0,0.3), inset 1px 1px 0 rgba(255,255,255,0.12);
}
.lb-shell {
  background: var(--clr-shell);
  box-shadow: inset 0 0 0 1px var(--clr-shell-border);
}

/* ─── 3Dキャンバス ─── */
#canvas-3d {
  display: block;
  border: 1px solid var(--clr-rule);
  background: var(--clr-grid-bg);
  cursor: grab;
  touch-action: none;
  width: 100%;
  max-width: 37.5rem;
  /* 方眼オーバーレイ */
  background-image:
    repeating-linear-gradient(to right, var(--clr-grid-line) 0, var(--clr-grid-line) 1px, transparent 1px, transparent 30px),
    repeating-linear-gradient(to bottom, var(--clr-grid-line) 0, var(--clr-grid-line) 1px, transparent 1px, transparent 30px);
}
#canvas-3d:active { cursor: grabbing; }

.canvas-hint {
  font-size: clamp(0.58rem, 1vw, 0.68rem);
  color: var(--clr-muted);
  margin-top: 0.4rem;
  letter-spacing: 0.06em;
}

/* ─── Reduced Motion ─── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* ─── レスポンシブ ─── */
@media (max-width: 600px) {
  header {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    text-align: center;
    gap: 0.4rem;
  }
  .home-btn {
    grid-column: 1;
    justify-self: start;
  }
  .header-center { grid-column: 1; }
  .ctrl-row { gap: 0.85rem; }
  .cell-size-group { width: 100%; }
  input[type="range"] { width: 100%; flex: 1; }
}

/* ─── Focus ─── */
:focus-visible {
  outline: 2px solid var(--clr-cobalt);
  outline-offset: 2px;
}