/* ========================================
   common.css - 共通スタイル
   ======================================== */

:root {
  --primary: #1a6b52;
  --primary-light: #e8f5e9;
  --primary-dark: #0d4a38;
  --accent: #f4a261;
  --accent-light: #fff3e0;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --error: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;

  /* グレードカラー */
  --grade-s: #FFD700;
  --grade-a: #4CAF50;
  --grade-b: #2196F3;
  --grade-c: #FF9800;
  --grade-d: #F44336;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100dvh;
}

/* ---- ヘッダー ---- */
.header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.header-inner {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header h1 {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.header-nav {
  display: flex;
  gap: 4px;
}

.header-nav a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.8125rem;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all 0.2s;
}

.header-nav a:hover,
.header-nav a.active {
  color: white;
  background: rgba(255, 255, 255, 0.15);
}

/* ---- メインコンテナ ---- */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

/* ---- カード ---- */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.card-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

/* ---- フォーム要素 ---- */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.form-label .required {
  color: var(--error);
  margin-left: 4px;
}

.form-select,
.form-input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  font-family: var(--font);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
  -webkit-appearance: none;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M1.41 0L6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}

.form-select:focus,
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 107, 82, 0.15);
}

.form-textarea {
  width: 100%;
  padding: 14px;
  font-size: 0.9375rem;
  font-family: var(--font);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  line-height: 1.7;
  resize: vertical;
  min-height: 200px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 107, 82, 0.15);
}

.char-count {
  text-align: right;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---- ボタン ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 12px rgba(26, 107, 82, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(26, 107, 82, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  background: var(--surface);
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--primary-light);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* ---- ローディング ---- */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.loading-overlay.hidden {
  display: none;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  margin-top: 16px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.loading-subtext {
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* ---- トースト通知 ---- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 2000;
  transition: transform 0.3s ease;
  max-width: calc(100% - 32px);
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: var(--error);
}

.toast.success {
  background: var(--success);
}

/* ---- 空状態 ---- */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.4;
}

.empty-state-text {
  font-size: 0.9375rem;
}

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

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

.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }

/* ---- レスポンシブ ---- */
@media (max-width: 480px) {
  .header {
    padding: 12px 16px;
  }

  .header h1 {
    font-size: 1rem;
  }

  .container {
    padding: 16px 12px 32px;
  }

  .card {
    padding: 16px;
  }
}