:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #f9fafb;
  --text: #111827;
  --muted: #5b6472;
  --border: #dfe5ee;
  --brand: #2457d6;
  --brand-dark: #1d46ad;
  --success: #137a3f;
  --shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  font-size: 1.2rem;
}
.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), #5a8bff);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}
.main-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  font-size: 0.95rem;
}
.main-nav a { color: var(--muted); font-weight: 650; }
.main-nav a:hover { color: var(--brand); text-decoration: none; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 34px 22px 56px;
}
.hero {
  background: radial-gradient(circle at top left, rgba(36, 87, 214, 0.16), transparent 32%), var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 54px 36px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  line-height: 1.02;
  margin: 0 0 18px;
  letter-spacing: -0.055em;
}
.hero p { color: var(--muted); font-size: 1.12rem; margin: 0 0 26px; max-width: 710px; }
.hero-card {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius);
  padding: 22px;
}
.hero-card strong { display: block; margin-bottom: 8px; }
.badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid #d6e0ff;
  background: #f1f5ff;
  color: #1e3f99;
  border-radius: 999px;
  padding: 7px 11px;
  font-weight: 700;
  font-size: 0.88rem;
}

.button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.98rem;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; }
.btn-secondary { background: #eef2f7; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #e5ebf3; text-decoration: none; }

.section { margin-top: 34px; }
.section-header { margin-bottom: 18px; }
.section h2 { font-size: clamp(1.55rem, 2.5vw, 2.1rem); margin: 0 0 8px; letter-spacing: -0.03em; }
.section p { color: var(--muted); margin: 0; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.035);
  color: var(--text);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.tool-card:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow); }
.tool-card h3 { margin: 0 0 10px; font-size: 1.15rem; letter-spacing: -0.02em; }
.tool-card p { color: var(--muted); margin: 0 0 16px; }
.tool-card span { font-weight: 800; color: var(--brand); }

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 22px;
  align-items: start;
}
.tool-shell,
.content-card,
.ad-card,
.notice-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.035);
}
.tool-shell { padding: 22px; }
.tool-title { margin: 0 0 10px; font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -0.05em; line-height: 1.08; }
.tool-intro { color: var(--muted); font-size: 1.08rem; margin: 0 0 22px; max-width: 760px; }
.privacy-note {
  background: #f0f7ff;
  border: 1px solid #cfe4ff;
  color: #143d68;
  border-radius: 14px;
  padding: 13px 15px;
  margin: 0 0 18px;
  font-size: 0.95rem;
}
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.field label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-weight: 800;
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
textarea {
  width: 100%;
  min-height: 360px;
  resize: vertical;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 14px;
  padding: 14px;
  font: 0.95rem/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}
textarea:focus { outline: 3px solid rgba(36, 87, 214, 0.18); border-color: var(--brand); background: #fff; }
.tool-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; align-items: center; }
.status { color: var(--muted); font-weight: 700; min-height: 25px; }
.status.success { color: var(--success); }
.status.error { color: #a32020; }
.case-options { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 15px; }
.case-options label {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  padding: 9px 12px;
  border-radius: 999px;
  font-weight: 750;
}

.sidebar { display: grid; gap: 16px; }
.ad-card { padding: 16px; min-height: 280px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; color: var(--muted); }
.ad-label { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 800; color: #8a94a3; margin-bottom: 12px; }
.ad-placeholder {
  width: 100%;
  min-height: 220px;
  border: 1px dashed #cbd5e1;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: #f8fafc;
}
.notice-card { padding: 18px; }
.notice-card h2, .notice-card h3 { margin-top: 0; letter-spacing: -0.02em; }
.notice-card p, .notice-card li { color: var(--muted); }
.related-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.related-list a { font-weight: 750; }

.content-card { padding: 26px; margin-top: 22px; }
.content-card h2, .content-card h3 { letter-spacing: -0.025em; }
.content-card p, .content-card li { color: #485365; }
.faq details { border-top: 1px solid var(--border); padding: 14px 0; }
.faq details:first-child { border-top: 0; }
.faq summary { cursor: pointer; font-weight: 850; }

.legal-page { max-width: 900px; }
.legal-page h1 { font-size: clamp(2rem, 4vw, 3.4rem); letter-spacing: -0.05em; line-height: 1.05; }
.legal-page h2 { margin-top: 32px; }
.legal-page p, .legal-page li { color: #485365; }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; }
.footer-links a { color: var(--muted); font-weight: 700; }

@media (max-width: 920px) {
  .hero, .tool-layout { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .workspace { grid-template-columns: 1fr; }
  textarea { min-height: 260px; }
  .ad-card { min-height: 140px; }
  .ad-placeholder { min-height: 90px; }
}

@media (max-width: 620px) {
  .header-inner { align-items: flex-start; flex-direction: column; }
  .main-nav { justify-content: flex-start; }
  .container { padding: 22px 16px 42px; }
  .hero { padding: 32px 20px; }
  .tools-grid { grid-template-columns: 1fr; }
  .tool-shell, .content-card { padding: 18px; }
  .btn { width: 100%; }
}