@import url('https://fonts.googleapis.com/css2?family=Kaisei+Decol:wght@400;700&family=Zen+Maru+Gothic:wght@400;500;700&display=swap');

/* ===== リセット & ベース ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #faf7f2;
  --paper: #fffdf8;
  --green: #5a8a6a;
  --green-light: #e8f3ec;
  --green-dark: #3d6b50;
  --amber: #d4843a;
  --amber-light: #fdf0e3;
  --red: #c0605a;
  --red-light: #fbeaea;
  --blue: #4a7faa;
  --blue-light: #e5f0f8;
  --text: #2c2c2c;
  --muted: #7a7a6e;
  --border: #e0dbd0;
  --shadow-soft: 0 2px 16px rgba(90,138,106,0.10);
  --shadow-card: 0 4px 24px rgba(60,80,60,0.08);
  --radius: 20px;
  --radius-sm: 12px;
}

body {
  font-family: 'Zen Maru Gothic', 'Hiragino Maru Gothic Pro', sans-serif;
  background: var(--bg);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(90,138,106,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(212,132,58,0.05) 0%, transparent 50%);
  color: var(--text);
  min-height: 100vh;
  padding: 20px 16px 48px;
}

.app {
  max-width: 660px;
  margin: 0 auto;
}

/* ===== ヘッダー ===== */
header {
  text-align: center;
  padding: 32px 0 28px;
}

.header-icon {
  font-size: 2.8rem;
  display: block;
  margin-bottom: 10px;
  animation: gentle-bounce 3s ease-in-out infinite;
}

@keyframes gentle-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

header h1 {
  font-family: 'Kaisei Decol', 'Hiragino Mincho Pro', serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-dark);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--muted);
  font-size: 0.88rem;
  letter-spacing: 0.04em;
}

.feature-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 14px 0 18px;
}

.feature-chips li {
  background: var(--green-light);
  color: var(--green-dark);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 999px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ===== カード ===== */
.card {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-card);
  border: 1.5px solid var(--border);
  position: relative;
  animation: slideUp 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

/* カード左端のアクセントライン */
.card::before {
  content: '';
  position: absolute;
  left: 0; top: 20px; bottom: 20px;
  width: 4px;
  background: linear-gradient(to bottom, var(--green), var(--amber));
  border-radius: 0 4px 4px 0;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card h2 {
  font-family: 'Kaisei Decol', serif;
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  color: var(--green-dark);
}

.step-badge {
  background: var(--green);
  color: #fff;
  border-radius: 50%;
  width: 28px; height: 28px;
  display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(90,138,106,0.3);
}

.hint {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 4px;
  margin-bottom: 12px;
  padding: 0;
  background: none;
  border-left: none;
  border-radius: 0;
  line-height: 1.6;
}

.hint-info {
  color: var(--blue);
  background: #f1f5ff;
  border-left: 3px solid var(--blue);
  border-radius: 0;
  padding: 10px 14px;
  margin-top: 12px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
}

/* ===== 入力行 ===== */
.row-inputs {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  gap: 5px;
  letter-spacing: 0.03em;
}

input[type="number"],
input[type="text"],
select {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  width: 80px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: #fff;
  color: var(--text);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(90,138,106,0.15);
}

select {
  width: auto;
  cursor: pointer;
}

.cross, .equals {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--muted);
  padding-bottom: 8px;
}

.capacity {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green);
  padding-bottom: 8px;
}

/* ===== ボタン類 ===== */
#btn-generate, .btn-generate {
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 11px 22px;
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 3px 10px rgba(90,138,106,0.25);
  letter-spacing: 0.04em;
}
#btn-generate:hover, .btn-generate:hover {
  background: var(--green-dark);
  box-shadow: 0 5px 16px rgba(90,138,106,0.35);
}
#btn-generate:active, .btn-generate:active { transform: scale(0.97); }

#btn-add-ng, #btn-add-want, #btn-add-far-ng, #btn-add-near-want, #btn-add-fixed, #btn-add-front, .btn-add {
  background: var(--green-light);
  color: var(--green-dark);
  border: 2px dashed var(--green);
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  margin-top: 10px;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.03em;
}
#btn-add-ng:hover, #btn-add-want:hover, #btn-add-far-ng:hover, #btn-add-near-want:hover, #btn-add-fixed:hover, #btn-add-front:hover, .btn-add:hover { background: #d4eadb; transform: translateY(-1px); }

#btn-run, .btn-run {
  background: linear-gradient(135deg, var(--green) 0%, var(--green-dark) 100%);
  color: #fff;
  border: none;
  border-radius: 16px;
  padding: 18px 52px;
  font-size: 1.25rem;
  font-family: 'Kaisei Decol', serif;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(90,138,106,0.35);
  transition: transform 0.15s, box-shadow 0.15s;
  letter-spacing: 0.08em;
  position: relative;
  overflow: hidden;
}
#btn-run::after, .btn-run::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
  pointer-events: none;
}
#btn-run:hover, .btn-run:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(90,138,106,0.42);
}
#btn-run:active, .btn-run:active { transform: scale(0.97); }

#btn-retry, .btn-retry {
  background: var(--paper);
  color: var(--green-dark);
  border: 2px solid var(--green);
  border-radius: var(--radius-sm);
  padding: 11px 24px;
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  margin-top: 0;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.04em;
}
#btn-retry:hover, .btn-retry:hover { background: var(--green-light); transform: translateY(-1px); }

.center { text-align: center; margin-bottom: 20px; }

/* ===== 生徒グリッド ===== */
#student-grid, .student-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.student-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  transition: transform 0.15s, box-shadow 0.15s;
  border: 2px solid transparent;
}
.student-chip:hover { transform: translateY(-1px); box-shadow: 0 3px 10px rgba(0,0,0,0.1); }
.student-chip:active { transform: scale(0.93); }

.student-chip.male {
  background: var(--blue-light);
  color: var(--blue);
  border-color: var(--blue);
}
.student-chip.female {
  background: var(--red-light);
  color: var(--red);
  border-color: var(--red);
}

/* ===== 条件ブロック ===== */
.condition-block {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1.5px dashed var(--border);
}
.condition-block:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.condition-block h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.condition-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
  background: #fdfcf8;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.condition-row input[type="number"],
.condition-row input[type="text"],
.condition-row select {
  width: 70px;
  padding: 7px 10px;
}
.condition-row .label-text {
  font-size: 0.83rem;
  color: var(--muted);
  font-weight: 700;
}

.btn-remove {
  background: var(--red-light);
  color: var(--red);
  border: none;
  border-radius: 8px;
  padding: 5px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
  font-weight: 700;
  transition: background 0.2s;
}
.btn-remove:hover { background: #f5c8c6; }

/* ===== 男女ルール ===== */
.gender-rule-options {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.radio-label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 7px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: #fff;
  transition: border-color 0.2s, background 0.2s;
}
.radio-label:has(input:checked) {
  border-color: var(--green);
  background: var(--green-light);
  color: var(--green-dark);
}
.radio-label input { cursor: pointer; width: auto; accent-color: var(--green); }

.col-gender-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.col-gender-row .label-text { font-size: 0.83rem; color: var(--muted); font-weight: 700; }
.col-gender-row select { width: 90px; }

/* ===== ローディング ===== */
.loading {
  text-align: center;
  padding: 40px;
  font-weight: 700;
  color: var(--green-dark);
  font-size: 1rem;
  letter-spacing: 0.05em;
}
.spinner {
  width: 44px; height: 44px;
  border: 4px solid var(--green-light);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 教室グリッド ===== */
.blackboard-wrap {
  margin-bottom: 18px;
  text-align: center;
}
.blackboard-label {
  display: inline-block;
  background: linear-gradient(135deg, #2d5a3d, #3d7a50);
  color: rgba(255,255,255,0.92);
  border-radius: 10px;
  padding: 9px 36px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  box-shadow: 0 3px 12px rgba(45,90,61,0.3);
}

#classroom-grid, .classroom {
  display: grid;
  gap: 8px;
  justify-content: center;
  padding: 4px;
}

.seat {
  width: 70px; height: 64px;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  border: 2px solid transparent;
  transition: transform 0.2s;
  animation: popIn 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
  cursor: default;
}
.seat:hover { transform: translateY(-2px); }

@keyframes popIn {
  from { opacity: 0; transform: scale(0.65); }
  to   { opacity: 1; transform: scale(1); }
}

.seat.male {
  background: var(--blue-light);
  border-color: var(--blue);
  color: var(--blue);
}
.seat.female {
  background: var(--red-light);
  border-color: var(--red);
  color: var(--red);
}
.seat.empty {
  background: #f4f2ee;
  border-color: var(--border);
  border-style: dashed;
  color: #c8c4bc;
}
.seat .seat-num {
  font-size: 1.05rem;
  font-weight: 700;
}
.seat .seat-gender {
  font-size: 0.7rem;
  margin-top: 2px;
  opacity: 0.85;
}

.result-actions { text-align: center; }

.error-msg {
  background: var(--amber-light);
  color: var(--amber);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-weight: 700;
  margin-top: 16px;
  font-size: 0.88rem;
  white-space: pre-line;
  border: 2px solid #f0c590;
  line-height: 1.7;
}

/* ===== ユーティリティ ===== */
.hidden { display: none !important; }

/* ===== 教室グリッド レイアウト修正 ===== */
#classroom-grid {
  overflow-x: auto;
  max-width: 100%;
  padding-bottom: 8px;
}

/* ===== 生徒チップ 横並びコンパクト ===== */
#student-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.student-chip {
  padding: 6px 12px;
  font-size: 0.82rem;
}

/* ===== 実行ボタンエリア ===== */
#section-execute {
  text-align: center;
  margin-bottom: 20px;
}

/* ===== 席選択中のハイライト ===== */
.seat.seat-selected {
  outline: 3px solid #f0b429;
  outline-offset: 2px;
  background: #fffbe6 !important;
  border-color: #f0b429 !important;
  color: #7a5c00 !important;
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 20px rgba(240, 180, 41, 0.35);
  z-index: 10;
  position: relative;
  transition: all 0.15s ease;
}

.seat.seat-selected .seat-num,
.seat.seat-selected .seat-gender {
  color: #7a5c00 !important;
}

/* ===== 保存・読み込みバー ===== */
.save-load-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

#btn-save-class {
  background: var(--amber-light);
  color: var(--amber);
  border: 2px solid var(--amber);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
#btn-save-class:hover { background: #fde5c8; transform: translateY(-1px); }

#btn-load-class {
  background: var(--green-light);
  color: var(--green-dark);
  border: 2px solid var(--green);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
#btn-load-class:hover { background: #c8e6d0; transform: translateY(-1px); }

/* ===== 印刷・シェアボタン（結果を外に出す操作＝青系で統一） ===== */
#btn-print, #btn-share {
  background: #f1f5ff;
  color: var(--blue);
  border: 2px solid var(--blue);
  border-radius: var(--radius-sm);
  padding: 11px 24px;
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  margin-top: 0;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.04em;
}
#btn-print:hover, #btn-share:hover { background: var(--blue-light); transform: translateY(-1px); }

/* ===== 印刷用スタイル ===== */
@media print {
  body * { visibility: hidden; }
  #section-result, #section-result * { visibility: visible; }
  #section-result { position: fixed; top: 0; left: 0; width: 100%; }
  .result-actions { display: none; }
  #error-msg { display: none; }
  header, #section-step1, #section-step2, #section-step3, #section-execute { display: none; }
  .seat { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}.app-footer {
  margin-top: 40px;
  padding: 24px 12px;
  text-align: center;
  border-top: 1px solid #e5e5e5;
}

.app-footer p {
  margin: 6px 0;
  font-size: 14px;
  color: #666;
}

.app-footer p:nth-child(1) {
  letter-spacing: 1px;
}

.app-footer p:nth-child(2) {
  font-weight: 500;
}

/* 座席図のラベル（v: 行・列・方向の表示） */
.grid-caption {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--muted);
  padding: 0 2px;
}
.grid-caption-center { justify-content: center; }
.grid-col-label,
.grid-row-label {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
}
@media print {
  .grid-caption, .grid-col-label, .grid-row-label {
    color: #666;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}