/* AI英検先生 — Legal & Form pages shared CSS (Apple HIG inspired) */

:root {
  --primary: #3B5CDB;
  --primary-dark: #1E40AF;
  --accent: #FF6B6B;
  --bg: #FFFFFF;
  --bg-soft: #F8FAFC;
  --text: #1F2937;
  --text-soft: #6B7280;
  --border: #E5E7EB;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1419;
    --bg-soft: #1A1F2E;
    --text: #E5E7EB;
    --text-soft: #9CA3AF;
    --border: #2D3340;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro JP", "SF Pro Display",
               "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.nav {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
  text-decoration: none;
}
.nav-back {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.nav-back:hover { color: var(--primary); }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
h1 {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  line-height: 1.2;
}
.last-updated {
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 40px;
}
h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 12px;
  letter-spacing: -0.01em;
  color: var(--text);
}
h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 20px 0 8px;
  color: var(--text);
}
p, li {
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--text);
}
ul, ol { padding-left: 24px; margin-bottom: 16px; }
a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { opacity: 0.8; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}
th { background: var(--bg-soft); font-weight: 600; }

footer {
  background: var(--bg-soft);
  padding: 40px 24px 32px;
  text-align: center;
  font-size: 13px;
  color: var(--text-soft);
  border-top: 1px solid var(--border);
  margin-top: 60px;
}
footer .links {
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}
footer a {
  color: var(--text-soft);
  text-decoration: none;
}
footer a:hover { color: var(--primary); }
.disclaimer {
  font-size: 11px;
  margin-top: 12px;
  color: var(--text-soft);
  line-height: 1.6;
}

.form-card {
  max-width: 440px;
  margin: 0 auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  box-shadow: var(--shadow);
}
.form-title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.form-sub {
  font-size: 14px;
  color: var(--text-soft);
  margin-bottom: 28px;
}
.field { margin-bottom: 16px; }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
}
.field input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 92, 219, 0.15);
}
.btn-submit {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 100px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  margin-top: 8px;
  font-family: inherit;
}
.btn-submit:hover { background: var(--primary-dark); }
.btn-submit:active { transform: scale(0.98); }
.btn-submit:disabled { opacity: 0.5; cursor: not-allowed; }
.alt-link {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-soft);
}
.error-msg {
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
  display: none;
}
.error-msg.visible { display: block; }