/* miniTools — 共通スタイル */

:root {
  --color-accent:       #017387;
  --color-accent-dark:  #015f70;
  --color-bg:           #fcfdff;
  --color-bg-secondary: #f0f1f7;
  --color-bg-white:     #ffffff;
  --color-text:         #4a514c;
  --color-text-sub:     #616161;
  --color-text-muted:   #999999;
  --color-border:       #e6e6e6;
  --color-border-light: #eeeeee;
  --color-success:      #2e7d32;
  --color-warning:      #f57c00;
  --color-error:        #d32f2f;
  --font-heading: 'Josefin Sans', 'M PLUS 1', 'Hiragino Sans', sans-serif;
  --font-body:    'M PLUS 1', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --font-mono:    'SFMono-Regular', 'Consolas', 'Menlo', monospace;
  --transition:   0.3s cubic-bezier(0.4, 0.4, 0, 1);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.7;
  letter-spacing: 0.02em;
  overflow-wrap: break-word;
  line-break: strict;
}

/* ─── Header ─── */
header {
  background: var(--color-bg-white);
  border-bottom: 1px solid var(--color-border-light);
  padding: 1.25rem 1.5rem;
}
.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}
.site-title:hover { color: var(--color-text); }
.site-title span { color: var(--color-accent); }
header nav a {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}
header nav a:hover { color: var(--color-accent); }

/* ─── Layout ─── */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

h1 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.4;
  color: var(--color-text);
  margin: 0;
}

/* ─── Card ─── */
.card {
  background: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: 3px 3px 30px -5px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* ─── Button ─── */
button {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  background: var(--color-accent);
  color: #fff;
  transition: all var(--transition);
}
button:hover { background: var(--color-accent-dark); transform: scale(1.03); }
button.secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-sub);
  border: 1px solid var(--color-border);
}
button.secondary:hover { background: var(--color-border); transform: none; }

/* ─── Form ─── */
input[type="text"] {
  font-family: var(--font-body);
  font-size: 1rem;
  width: 100%;
  padding: 0.65rem 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(1, 115, 135, 0.12);
}

/* ─── Tool structure helpers ─── */
/* H1直下の概要説明 */
.tool-desc {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  margin: 0;
  line-height: 1.7;
}
/* 最下部の補足・注意事項（vt-check スタイル準拠） */
.tool-note {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  background: var(--color-bg-secondary);
  border-radius: 8px;
  padding: 0.6rem 0.875rem;
  line-height: 1.7;
  margin: 0;
}
.tool-note a { color: var(--color-accent); text-decoration: none; }
.tool-note a:hover { text-decoration: underline; }
.tool-note ul { margin: 0.25rem 0 0; padding-left: 1.25rem; }
.tool-note li { margin-bottom: 0.15rem; }

/* ─── Footer ─── */
footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}
footer a { color: var(--color-text-sub); text-decoration: none; }
footer a:hover { color: var(--color-accent); }

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .container { padding: 1.5rem 1rem; }
  button { width: 100%; }
}