/* シリアルコード入力ページのスタイル
 * モバイル優先のシンプルなデザイン
 */

:root {
  --color-primary: #4a6fa5;
  --color-primary-dark: #3a5a8a;
  --color-success: #2d8a4f;
  --color-error: #c0392b;
  --color-warning: #d68910;
  --color-text: #2c3e50;
  --color-text-secondary: #7f8c8d;
  --color-bg: #f5f7fa;
  --color-card: #ffffff;
  --color-border: #d1d8e0;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

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

html,
body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 16px;
  min-height: 100vh;
}

.header img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
  /* 画像の角を少し丸くする */
  margin-bottom: 15px;
}

.header {
  text-align: center;
  margin-bottom: 32px;
}

.header h1 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  color: var(--color-primary-dark);
}

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

.form-section {
  background-color: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background-color: #fff;
  transition: border-color 0.15s ease;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.15);
}

.form-help {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.submit-btn {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.submit-btn:hover {
  background-color: var(--color-primary-dark);
}

.submit-btn:disabled {
  background-color: #b0b9c5;
  cursor: not-allowed;
}

.result {
  margin-top: 20px;
  padding: 14px 16px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  display: none;
}

.result.success {
  display: block;
  background-color: #e8f5ec;
  color: var(--color-success);
  border-left: 3px solid var(--color-success);
}

.result.error {
  display: block;
  background-color: #fbe9e7;
  color: var(--color-error);
  border-left: 3px solid var(--color-error);
}

.result.warning {
  display: block;
  background-color: #fef5e7;
  color: var(--color-warning);
  border-left: 3px solid var(--color-warning);
}

.result h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.result ul {
  list-style: disc;
  padding-left: 20px;
  margin-top: 8px;
}

.footer {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  padding: 24px 0 16px;
}

.footer p {
  margin-bottom: 4px;
}