:root {
  --bg-light: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.75);
  --border-card: rgba(255, 255, 255, 0.9);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-primary: #4f46e5;
  --accent-secondary: #0891b2;
  --accent-gradient: linear-gradient(135deg, #4f46e5, #7c3aed, #06b6d4);
  --success-bg: rgba(16, 185, 129, 0.1);
  --success-border: rgba(16, 185, 129, 0.4);
  --success-text: #059669;
  --error-bg: rgba(239, 68, 68, 0.1);
  --error-border: rgba(239, 68, 68, 0.4);
  --error-text: #dc2626;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Outfit', 'Noto Sans JP', sans-serif;
  background-color: var(--bg-light);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* バックグラウンドの明るいオーラ・グラデーション演出 */
.bg-gradient-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background: 
    radial-gradient(circle at 15% 20%, rgba(99, 102, 241, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(6, 182, 212, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 50% 40%, rgba(244, 114, 182, 0.15) 0%, transparent 60%),
    linear-gradient(180deg, #f8fafc 0%, #eff6ff 100%);
  pointer-events: none;
}

/* ヘッダー */
.app-header {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
}

.logo-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-primary);
  background: rgba(79, 70, 229, 0.1);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  border: 1px solid rgba(79, 70, 229, 0.25);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: #1e293b;
}

.accent-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

/* メインコンテナ */
.main-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.center-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 150px);
}

/* ガイドバナー */
.guide-banner {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.85);
  border-left: 4px solid var(--accent-primary);
  padding: 1.25rem;
  border-radius: 16px;
  margin-bottom: 2rem;
  box-shadow: 0 10px 25px -5px rgba(148, 163, 184, 0.15);
  border-top: 1px solid rgba(255, 255, 255, 0.8);
  border-right: 1px solid rgba(255, 255, 255, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.8);
}

.guide-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.guide-content strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.guide-content p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.guide-content .highlight {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: rgba(79, 70, 229, 0.4);
}

/* 免責・非公式注記バナー */
.disclaimer-banner {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: rgba(254, 243, 199, 0.85);
  border-left: 4px solid #f59e0b;
  padding: 1.15rem 1.25rem;
  border-radius: 16px;
  margin-bottom: 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(245, 158, 11, 0.15);
  border-top: 1px solid rgba(253, 230, 138, 0.8);
  border-right: 1px solid rgba(253, 230, 138, 0.8);
  border-bottom: 1px solid rgba(253, 230, 138, 0.8);
}

.disclaimer-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.disclaimer-content strong {
  display: block;
  font-size: 0.95rem;
  color: #92400e;
  margin-bottom: 0.25rem;
}

.disclaimer-content p {
  font-size: 0.85rem;
  color: #78350f;
  line-height: 1.5;
}

/* グラスモーフィズムカード（ライト） */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: 24px;
  padding: 2rem 1.5rem;
  box-shadow: 0 25px 50px -12px rgba(148, 163, 184, 0.35);
}

@media (min-width: 640px) {
  .glass-card {
    padding: 2.5rem;
  }
}

.mt-lg {
  margin-top: 2.5rem;
}

/* セクションヘッダー */
.section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  border-bottom: 2px solid rgba(226, 232, 240, 0.8);
  padding-bottom: 0.75rem;
}

.section-icon {
  font-size: 1.4rem;
}

h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
}

/* 学校選択グリッド＆スマホ最適化カード */
.school-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

@media (min-width: 480px) {
  .school-grid {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  }
}

.school-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid #cbd5e1;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-fast);
  box-shadow: 0 2px 4px rgba(148, 163, 184, 0.05);
}

.school-card:hover {
  background: #ffffff;
  border-color: #94a3b8;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(148, 163, 184, 0.15);
}

.school-card:active {
  transform: scale(0.98);
}

/* 選択済み状態のスタイル */
.school-card.checked {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--accent-primary);
  border-width: 1.5px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.school-card input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 2px solid #94a3b8;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.school-card.checked .checkbox-custom {
  background: var(--accent-gradient);
  border-color: transparent;
}

.school-card.checked .checkbox-custom::after {
  content: "✓";
  color: white;
  font-size: 0.75rem;
  font-weight: bold;
}

.school-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: #334155;
}

.school-card.checked .school-name {
  color: var(--accent-primary);
}

/* メールアドレス入力 */
.email-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.label-text {
  font-weight: 700;
  font-size: 1rem;
  color: #1e293b;
}

.required-badge {
  background: #ef4444;
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 1rem;
  font-size: 1.1rem;
}

input[type="email"] {
  width: 100%;
  background: #ffffff;
  border: 1.5px solid #cbd5e1;
  padding: 1rem 1rem 1rem 3rem;
  border-radius: 14px;
  color: #0f172a;
  font-size: 1rem;
  font-weight: 500;
  transition: var(--transition-fast);
  box-shadow: inset 0 2px 4px rgba(148, 163, 184, 0.05);
}

input[type="email"]:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

input[type="email"]::placeholder {
  color: #94a3b8;
}

.input-hint {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* 迷惑メール例外設定（受信許可）案内ボックス */
.whitelist-box {
  background: rgba(238, 242, 255, 0.85);
  border: 1px solid rgba(199, 210, 254, 0.9);
  border-left: 4px solid var(--accent-primary);
  border-radius: 14px;
  padding: 1.1rem 1.25rem;
  margin-top: 1.25rem;
  text-align: left;
}

.whitelist-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.whitelist-icon {
  font-size: 1.2rem;
}

.whitelist-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #3730a3;
}

.whitelist-desc {
  font-size: 0.82rem;
  color: #334155;
  line-height: 1.6;
  margin: 0;
}

.domain-badge {
  display: inline-block;
  background: #ffffff;
  border: 1px solid #c7d2fe;
  color: #4f46e5;
  font-family: monospace;
  font-size: 0.85rem;
  font-weight: bold;
  padding: 0.1rem 0.45rem;
  border-radius: 6px;
  margin: 0 0.2rem;
}

/* 利用規約同意エリア */
.terms-agreement-area {
  display: flex;
  justify-content: center;
}

.terms-checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1.5px solid #cbd5e1;
  padding: 0.85rem 1.25rem;
  border-radius: 14px;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-fast);
  box-shadow: 0 2px 4px rgba(148, 163, 184, 0.05);
}

.terms-checkbox-label:hover {
  background: #ffffff;
  border-color: #94a3b8;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(148, 163, 184, 0.15);
}

.terms-checkbox-label:active {
  transform: scale(0.98);
}

.terms-checkbox-label.checked {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--accent-primary);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}

.terms-checkbox-label input[type="checkbox"] {
  display: none;
}

.terms-checkbox-label.checked .checkbox-custom {
  background: var(--accent-gradient);
  border-color: transparent;
}

.terms-checkbox-label.checked .checkbox-custom::after {
  content: "✓";
  color: white;
  font-size: 0.75rem;
  font-weight: bold;
}

.terms-agree-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: #334155;
}

.terms-link {
  color: var(--accent-primary);
  text-decoration: underline;
  font-weight: 700;
}

.terms-link:hover {
  color: var(--accent-secondary);
}

/* 送信ボタン＆アニメーション */
.action-area {
  margin-top: 2.5rem;
  text-align: center;
}

.btn-primary {
  position: relative;
  width: 100%;
  padding: 1.15rem 2rem;
  border-radius: 16px;
  border: none;
  background: var(--accent-gradient);
  color: white;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  overflow: hidden;
  transition: var(--transition-fast);
  box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(79, 70, 229, 0.5);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-glow {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transition: 0.5s;
}

.btn-primary:hover .btn-glow {
  left: 100%;
}

/* ステータスメッセージボックス */
.status-box {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 14px;
  font-size: 0.95rem;
  font-weight: 600;
  animation: fadeIn 0.3s ease;
}

.status-box.hidden {
  display: none;
}

.status-box.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.status-box.error {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 完了画面専用スタイル */
.complete-card {
  text-align: center;
  max-width: 480px;
  width: 100%;
}

.status-icon-wrapper {
  margin: 0 auto 1.5rem;
  width: 80px;
  height: 80px;
  background: rgba(79, 70, 229, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(79, 70, 229, 0.25);
}

.status-icon {
  font-size: 2.5rem;
}

.pulse {
  animation: pulseAnim 2s infinite;
}

@keyframes pulseAnim {
  0% { transform: scale(0.95); }
  50% { transform: scale(1.1); }
  100% { transform: scale(0.95); }
}

.complete-message {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.25rem 0 1.5rem;
  color: #1e293b;
}

/* 本登録完了ガイダンスボックス */
.complete-guide-box {
  background: linear-gradient(135deg, rgba(238, 242, 255, 0.95) 0%, rgba(248, 250, 252, 0.95) 100%);
  border: 1px solid rgba(129, 140, 248, 0.4);
  border-radius: 16px;
  padding: 1.5rem;
  margin: 0 0 2.25rem;
  text-align: left;
  box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.12);
  position: relative;
  overflow: hidden;
}

.complete-guide-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: var(--accent-gradient);
}

.guide-box-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed rgba(129, 140, 248, 0.4);
}

.guide-icon {
  font-size: 1.3rem;
}

.guide-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #4338ca;
}

.guide-box-content {
  padding-left: 0.25rem;
}

.guide-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.guide-list li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 0.85rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #334155;
  line-height: 1.6;
}

.guide-list li:last-child {
  margin-bottom: 0;
}

.guide-list li::before {
  content: "✔";
  position: absolute;
  left: 0;
  top: 0.1rem;
  color: #4f46e5;
  font-size: 0.9rem;
  font-weight: bold;
}

.btn-link {
  display: inline-block;
  text-decoration: none;
}

/* フッター */
.app-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
}

.disclaimer-footer-note {
  font-size: 0.75rem;
  color: #64748b;
  margin-bottom: 0.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.4;
}

.footer-link {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-fast);
}

.footer-link:hover {
  text-decoration: underline;
  color: var(--accent-secondary);
}

.fixed-footer {
  position: absolute;
  bottom: 0;
  width: 100%;
}

/* 利用規約画面スタイル */
.terms-card {
  line-height: 1.8;
  color: #334155;
}

.terms-intro {
  font-size: 0.95rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid rgba(226, 232, 240, 0.8);
}

.terms-section {
  margin-bottom: 2rem;
}

.terms-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 0.75rem;
  padding-left: 0.75rem;
  border-left: 4px solid var(--accent-primary);
}

.terms-section p {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.terms-list {
  padding-left: 1.5rem;
  font-size: 0.95rem;
}

.terms-list li {
  margin-bottom: 0.75rem;
}

.terms-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #cbd5e1;
  font-size: 0.9rem;
  color: var(--text-secondary);
}