:root {
  --bg: #f5f9ff;
  --panel: #ffffff;
  --surface-muted: #edf3ff;
  --border: #d6e3f6;
  --text: #102a43;
  --muted: #5b6b87;
  --brand: #2b7de9;
  --brand-2: #5aa0ff;
  --ok: #1a9a58;
  --warn: #d97706;
  --bad: #dc2626;
  --radius: 14px;
  --shadow: 0 18px 36px rgba(43, 125, 233, 0.14);
  --ring: 0 0 0 3px rgba(43, 125, 233, 0.28);
  --maxw: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: linear-gradient(180deg, #f5f9ff 0%, #f2f6ff 55%, #e7f0ff 100%);
  color: var(--text);
  font: 16px/1.6 "Inter", "SF Pro Text", system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
}

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

a:hover,
a:focus-visible {
  color: var(--brand-2);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px;
}

header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
}

.brand .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(43, 125, 233, 0.16);
}

.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.menu a {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  transition: background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.menu a[aria-current="page"] {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 12px 24px rgba(43, 125, 233, 0.08);
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
  margin-top: 24px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card.warn {
  border-color: rgba(217, 119, 6, 0.35);
  background: linear-gradient(180deg, rgba(255, 243, 220, 0.75), #fff9ee);
  color: var(--warn);
}

.card.warn ul {
  color: inherit;
}

.pad {
  padding: 24px;
}

h1 {
  font-size: clamp(32px, 5vw, 42px);
  line-height: 1.16;
  margin: 0 0 10px;
  color: var(--text);
}

h2 {
  font-size: clamp(24px, 3vw, 28px);
  margin: 0 0 14px;
  color: var(--text);
}

h3 {
  margin: 0 0 10px;
  color: var(--text);
}

.lead {
  color: var(--muted);
  margin: 0 0 18px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--text);
  font-weight: 600;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.btn.primary {
  background: linear-gradient(180deg, var(--brand), #2f6fda);
  border-color: #2f6fda;
  color: #ffffff;
}

.btn.ghost {
  background: transparent;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(43, 125, 233, 0.16);
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.field:focus-visible {
  border-color: var(--brand);
  box-shadow: var(--ring);
}

textarea.field {
  min-height: 140px;
  resize: vertical;
}

label {
  font-weight: 600;
  color: var(--muted);
}

.panel-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.panel-list .item {
  background: var(--surface-muted);
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 15px;
}

.section {
  margin: 44px 0;
}

.section p {
  margin: 0 0 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.card-link {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 150px;
  color: inherit;
}

.card-link:hover {
  color: inherit;
  transform: translateY(-2px);
}

.card-link span {
  color: var(--muted);
  font-size: 14px;
}

ul,
ol {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
}

.faq details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.faq details + details {
  margin-top: 10px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.muted {
  color: var(--muted);
}

.sticky-toolbar {
  position: sticky;
  top: 84px;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
}

.preview-card {
  display: grid;
  gap: 12px;
}

.preview-card .preview-window {
  aspect-ratio: 9 / 19.5;
  border-radius: 24px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 15px;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.meta-grid .meta-item {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--muted);
}

footer {
  margin-top: 48px;
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
}

footer .grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: center;
}

footer a {
  color: var(--muted);
}

.stamp {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .menu {
    display: none;
  }

  .sticky-toolbar {
    position: relative;
    top: auto;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 20px;
  }

  .form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.field:focus-visible {
  border-color: var(--brand);
  box-shadow: var(--ring);
}

textarea.field {
  min-height: 140px;
  resize: vertical;
}

label {
  font-weight: 600;
  color: var(--muted);
}

.panel-list {
    grid-template-columns: 1fr;
  }

  .preview-card .preview-window {
    aspect-ratio: 3 / 5.5;
  }
}

.align-right {
  text-align: right;
}