/* ================================
   タラレバ計算機 - スタイルシート
   Modern Minimal Dark Theme
   ================================ */

/* ---------- CSS変数 ---------- */
:root {
  /* カラーパレット (モダンダークテーマ) */
  --color-bg: #0a0a0f;
  --color-bg-card: #111118;
  --color-bg-input: #0d0d14;
  --color-bg-elevated: #16161f;
  --color-text: #f0f0f5;
  --color-text-secondary: #a0a0b0;
  --color-text-muted: #606070;
  
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-accent: #22d3ee;
  
  --color-profit: #10b981;
  --color-loss: #ef4444;
  
  --color-twitter: #000000;
  --color-line: #06c755;
  
  --color-border: #1f1f2e;
  --color-border-hover: #2a2a3e;
  --color-ad-bg: #111118;
  
  /* フォント */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-family-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  
  /* サイズ */
  --container-max-width: 720px;
  --border-radius: 16px;
  --border-radius-sm: 10px;
  --border-radius-xs: 6px;
  
  /* シャドウ */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  
  /* トランジション */
  --transition-fast: 0.15s ease;
  --transition: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ---------- リセット ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

/* ---------- コンテナ ---------- */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 20px;
}

@media (min-width: 1200px) {
  .container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 30px;
    max-width: 1200px;
  }
  
  .header, .ad-slot--header, .how-to-use, .disclaimer, .ad-slot--footer, .footer {
    grid-column: 1 / -1;
  }
  
  .main {
    grid-column: 1;
  }
  
  .sidebar {
    grid-column: 2;
    grid-row: 3 / 6;
  }
}

/* ---------- ヘッダー ---------- */
.header {
  text-align: center;
  padding: 60px 0 40px;
}

.header__title {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 12px;
}

.header__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

@media (max-width: 600px) {
  .header {
    padding: 40px 0 30px;
  }
  
  .header__title {
    font-size: 2rem;
  }
  
  .header__subtitle {
    font-size: 1rem;
  }
}

/* ---------- 広告スロット ---------- */
.ad-slot {
  margin: 24px 0;
}

.ad-placeholder {
  background: var(--color-ad-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: 40px 20px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.ad-placeholder--a8 {
  border-color: var(--color-border);
  background: var(--color-bg-elevated);
}

.ad-label {
  text-align: center;
  color: var(--color-text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.ad-slot--sidebar {
  margin-bottom: 20px;
}

.ad-slot--sidebar .ad-placeholder {
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- セクション ---------- */
.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--color-text);
}

.section-title--result {
  color: var(--color-text);
}

/* ---------- 入力フォーム ---------- */
.input-section {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 32px;
  margin-bottom: 32px;
}

.calculator-form {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.form-group--inline {
  flex-direction: row;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.form-label {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.form-input, .form-select {
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: 14px 18px;
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.form-input:hover, .form-select:hover {
  border-color: var(--color-border-hover);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-input--small {
  width: 100px;
  text-align: center;
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-with-unit--small {
  gap: 6px;
}

.input-unit {
  font-size: 1rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.input-unit--prefix {
  font-size: 0.9rem;
}

/* セレクトボックスのカスタマイズ */
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238892a0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

.btn--primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn--primary:active {
  background: var(--color-primary-dark);
  transform: translateY(0);
}

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

.btn--secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card);
}

.btn--twitter {
  background: var(--color-twitter);
  color: white;
  border: 1px solid #333;
}

.btn--twitter:hover {
  background: #1a1a1a;
}

.btn--line {
  background: var(--color-line);
  color: white;
}

.btn--line:hover {
  background: #05b04d;
}

.btn__loading {
  display: none;
}

.btn__loading[hidden] {
  display: none;
}

/* ---------- 結果セクション ---------- */
.result-section {
  margin-bottom: 32px;
  animation: fadeIn 0.4s ease;
}

.result-section[hidden] {
  display: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 32px;
  box-shadow: var(--shadow-glow);
}

.result-card__header {
  text-align: center;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.result-card__scenario {
  display: block;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.result-card__asset {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.result-card__body {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 28px;
}

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

.result-value__label {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-value__amount {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--color-text);
  font-family: var(--font-family-mono);
  letter-spacing: -0.02em;
}

.result-diff {
  text-align: center;
  padding: 20px;
  background: var(--color-bg-elevated);
  border-radius: var(--border-radius-sm);
}

.result-diff--profit {
  background: rgba(16, 185, 129, 0.08);
}

.result-diff--profit .result-diff__amount {
  color: var(--color-profit);
}

.result-diff--loss .result-diff__amount {
  color: var(--color-loss);
}

.result-diff__label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-diff__amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-profit);
  font-family: var(--font-family-mono);
}

.result-diff__multiplier {
  display: block;
  font-size: 1rem;
  color: var(--color-accent);
  margin-top: 8px;
  font-weight: 500;
}

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

.result-message {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

@media (max-width: 600px) {
  .result-value__amount {
    font-size: 2rem;
  }
  
  .result-diff__amount {
    font-size: 1.5rem;
  }
}

/* ---------- 結果アクション ---------- */
.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.result-actions .btn {
  font-size: 0.875rem;
  padding: 12px 20px;
}

/* ---------- 使い方 ---------- */
.how-to-use {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 32px;
  margin: 40px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 700px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 400px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  text-align: center;
  padding: 24px 16px;
  background: var(--color-bg-elevated);
  border-radius: var(--border-radius-sm);
  transition: transform var(--transition-fast);
}

.step:hover {
  transform: translateY(-3px);
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 50%;
  margin-bottom: 14px;
}

.step__text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.step__text strong {
  color: var(--color-text);
  display: block;
  font-size: 0.9375rem;
  margin-bottom: 2px;
}

/* ---------- 注意事項 ---------- */
.disclaimer {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 28px 32px;
  margin: 40px 0;
}

.disclaimer__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.disclaimer__list li {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.disclaimer__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: 4px;
  background: var(--color-text-muted);
  border-radius: 50%;
}

/* ---------- サイドバー ---------- */
.sidebar {
  display: none;
}

@media (min-width: 1200px) {
  .sidebar {
    display: block;
    position: sticky;
    top: 20px;
    height: fit-content;
  }
}

/* ---------- フッター ---------- */
.footer {
  text-align: center;
  padding: 40px 0;
  margin-top: 60px;
  border-top: 1px solid var(--color-border);
}

.footer__copyright {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.footer__links {
  font-size: 0.8125rem;
}

.footer__links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary-light);
}

/* ---------- ローディング ---------- */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

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

/* ---------- エラー表示 ---------- */
.error-message {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--border-radius-sm);
  padding: 16px 20px;
  color: var(--color-loss);
  margin-top: 20px;
  text-align: center;
  font-size: 0.9375rem;
}

/* ---------- アクセシビリティ ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* フォーカス表示 */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* スクリーンリーダー用 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- セレクションハイライト ---------- */
::selection {
  background: var(--color-primary);
  color: white;
}

/* ---------- スクロールバー ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}