/* =============================================
   0-TOOLs 共通スタイル
   ============================================= */

/* CSS変数 */
:root {
  --clr-primary: #3AA8E8;
  --clr-primary-dark: #2F6FA5;
  --clr-bg: #F5F9FF;
  --clr-surface: #ffffff;
  --clr-text: #1a1a1a;
  --clr-text-muted: #555;
  --clr-border: #e0eaf4;
  --clr-shadow: rgba(0,0,0,0.08);
  --clr-error: #d9534f;
  --clr-success: #28a745;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN',
          'Noto Sans JP', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --clr-bg: #0f1117;
    --clr-surface: #1e2230;
    --clr-text: #e8eaf0;
    --clr-text-muted: #9aa3b5;
    --clr-border: #2d3348;
    --clr-shadow: rgba(0,0,0,0.3);
  }
}

[data-theme="dark"] {
  --clr-bg: #0f1117;
  --clr-surface: #1e2230;
  --clr-text: #e8eaf0;
  --clr-text-muted: #9aa3b5;
  --clr-border: #2d3348;
  --clr-shadow: rgba(0,0,0,0.3);
}

[data-theme="light"] {
  --clr-bg: #F5F9FF;
  --clr-surface: #ffffff;
  --clr-text: #1a1a1a;
  --clr-text-muted: #555;
  --clr-border: #e0eaf4;
  --clr-shadow: rgba(0,0,0,0.08);
}

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

body {
  font-family: var(--font);
  margin: 0;
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

/* =============================================
   ヘッダー
   ============================================= */
.site-header {
  background: var(--clr-primary);
  color: #fff;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.site-header__inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

.site-header__logo {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.5px;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: rgba(255,255,255,0.85);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  user-select: none;
}
.theme-switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.theme-switch__track {
  width: 38px;
  height: 22px;
  background: rgba(255,255,255,0.2);
  border-radius: 11px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}
.theme-switch input:checked ~ .theme-switch__track {
  background: rgba(255,255,255,0.45);
}
.theme-switch__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
}
.theme-switch input:checked ~ .theme-switch__track .theme-switch__thumb {
  transform: translateX(16px);
}

/* =============================================
   パンくず
   ============================================= */
.breadcrumb {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: 8px 16px;
  font-size: 12px;
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 960px;
  margin: 0 auto;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  color: var(--clr-text-muted);
}

.breadcrumb li + li::before {
  content: '›';
  margin-right: 4px;
  color: var(--clr-text-muted);
}

.breadcrumb a {
  color: var(--clr-primary);
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

/* =============================================
   広告スロット（CLSゼロ保証）
   ============================================= */
.ad-slot {
  width: 100%;
  overflow: hidden;
}

.ad-top    { min-height: 90px; }
.ad-middle { min-height: 250px; margin: 24px 0; }
.ad-bottom { min-height: 90px; margin-top: 24px; }

/* =============================================
   フッター
   ============================================= */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  text-align: center;
  padding: 24px 16px;
  font-size: 13px;
  color: var(--clr-text-muted);
  margin-top: 48px;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 14px;
  margin-bottom: 12px;
}

.site-footer__links a {
  color: var(--clr-primary);
  text-decoration: none;
}

.site-footer__links a:hover { text-decoration: underline; }

/* =============================================
   トースト通知
   ============================================= */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1a1a1a;
  color: #fff;
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 14px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 9999;
  white-space: nowrap;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* =============================================
   ツールカード（トップページ用）
   ============================================= */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 960px;
  margin: 0 auto;
}

@media (min-width: 600px) {
  .tools-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
  .tools-grid { grid-template-columns: repeat(4, 1fr); }
}

.tool-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  color: var(--clr-primary-dark);
  box-shadow: 0 2px 6px var(--clr-shadow);
  aspect-ratio: 1;
  padding: 16px 8px;
  transition: transform 0.15s, box-shadow 0.15s;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px var(--clr-shadow);
}

.tool-card__icon {
  font-size: 28px;
  margin-bottom: 6px;
}