/* webinar/css/common.css — 全ページ共通 */

:root {
  --color-primary: #0066cc;
  --color-primary-dark: #004a99;
  --color-accent: #ff6600;
  --color-bg: #f7f9fb;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warn: #f59e0b;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --max-width: 960px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 16px;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 24px;
  margin-bottom: 16px;
}

.brand {
  font-size: 14px;
  color: var(--color-muted);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

h1, h2, h3 { margin: 0 0 12px; }
h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 16px; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--color-primary-dark); }
.btn:disabled {
  background: var(--color-muted);
  cursor: not-allowed;
  opacity: 0.6;
}
.btn.btn-accent { background: var(--color-accent); }
.btn.btn-accent:hover { background: #cc5200; }
.btn.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn.btn-ghost:hover { background: rgba(0, 102, 204, 0.05); }

.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: 14px;
}
.alert-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}
.alert-info {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e40af;
}
.alert-success {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.muted { color: var(--color-muted); font-size: 13px; }
.small { font-size: 13px; }
.center { text-align: center; }

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Form */
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--color-text);
}
.field label .required {
  color: var(--color-danger);
  margin-left: 4px;
}
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  border: 1.5px solid #9ca3af;
  border-radius: var(--radius);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input[type="text"]:hover,
.field input[type="email"]:hover,
.field input[type="tel"]:hover,
.field select:hover,
.field textarea:hover {
  border-color: #6b7280;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}
.field .hint {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 4px;
}

/* Responsive */
@media (max-width: 640px) {
  h1 { font-size: 20px; }
  h2 { font-size: 18px; }
  .card { padding: 16px; }
  .container { padding: 16px 12px; }
}