/* ===== 共通スタイル ===== */

/* 基本変数 */

:root {
  --color-surface: #ffffff;
  --color-surface-alt: #f0f4fb;
  --color-border: #dfe4f1;
  --color-text: #121826;
  --color-text-muted: #8a94a6;
  --color-primary: #1f75ff;
  --color-primary-strong: #0f5fe0;
  --color-primary-soft: rgba(31, 117, 255, 0.15);
  --color-success: #3cd57d;
  --color-success-soft: rgba(60, 213, 125, 0.12);
  --color-danger: #ff7a8a;
  --color-danger-soft: rgba(255, 122, 138, 0.16);
  --radius-large: 20px;
  --radius-medium: 16px;
  --radius-pill: 10px;
  --radius-small: 12px;
  --shadow-soft: 0 12px 32px rgba(18, 24, 38, 0.08);
  --shadow-raised: 0 6px 18px rgba(18, 24, 38, 0.08);
  --shadow-accent: 0 12px 28px rgba(15, 95, 224, 0.3);
  --shadow-button: 0 6px 14px rgba(18, 24, 38, 0.12);
  --transition-base: 0.12s ease;
  --transition-slow: 0.1s ease-out;
}

/* リセット */

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ベースタイポグラフィ */

body,
h1,
h2,
ul {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans JP',
    sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 標準要素 */

a {
  color: inherit;
}

/* インタラクティブ要素 */

button {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  cursor: pointer;
  transition: transform var(--transition-base),
    box-shadow var(--transition-base), background var(--transition-base),
    color var(--transition-base);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

input {
  font: inherit;
  color: inherit;
}

/* ===== 共通レイアウト ===== */

/* コンテナ */
.container {
  max-width: var(--container-max-width, 420px);
  margin: 0 auto;
  padding: var(--container-padding, 16px);
}

/* ===== 共通コンポーネント ===== */

/* 戻るボタン */
.editor__back-button,
.result__back-button {
  position: absolute;
  top: -6px;
  left: -10px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  color: var(--color-primary);
  text-decoration: none;
  font-size: 16px;
  transition: all var(--transition-base);
  z-index: 10;
}