:root {
  color-scheme: light;
  --bg: #f4f7f3;
  --bg-accent:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.12), transparent 30%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.12), transparent 26%);
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: #ffffff;
  --ink: #112014;
  --muted: #5f6f62;
  --line: rgba(16, 24, 16, 0.08);
  --line-strong: rgba(16, 24, 16, 0.14);
  --brand: #1f7a38;
  --brand-dark: #14532d;
  --brand-soft: #eaf7ee;
  --blue-soft: #eef5ff;
  --blue-line: #c8daf8;
  --warn: #8a5a00;
  --warn-soft: #fff5de;
  --shadow: 0 18px 48px rgba(16, 24, 16, 0.08);
  --shadow-soft: 0 10px 24px rgba(16, 24, 16, 0.05);
  --radius: 24px;
}

* {
  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;
  background: var(--bg);
  background-image: var(--bg-accent);
  color: var(--ink);
  line-height: 1.6;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.18s ease, opacity 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

a:hover {
  color: var(--brand-dark);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(47, 156, 83, 0.28);
  outline-offset: 2px;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

main {
  display: grid;
  gap: 28px;
}

h1,
h2,
h3,
h4 {
  line-height: 1.15;
  margin-top: 0;
  letter-spacing: -0.03em;
}

pre {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #f7faf7;
  overflow-x: auto;
}

ul.clean {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.clean li + li {
  margin-top: 12px;
}

.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 48px;
}

.nav,
.footer,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(14px);
}

.nav,
.footer {
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.nav {
  position: sticky;
  top: 16px;
  z-index: 20;
  margin-bottom: 28px;
}

.nav-brand {
  min-width: 180px;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  flex: 1;
  align-items: center;
  justify-content: center;
}

.nav-links a,
.nav-auth a,
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid transparent;
  font-size: 0.94rem;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-auth a:hover,
.btn-link:hover {
  border-color: var(--line);
  background: #ffffff;
  text-decoration: none;
}

.nav-links a.active,
.nav-auth a.active {
  background: linear-gradient(135deg, var(--brand-soft), #ffffff);
  border-color: rgba(31, 122, 56, 0.18);
  color: var(--brand-dark);
  box-shadow: inset 0 0 0 1px rgba(31, 122, 56, 0.04);
}

.nav-auth {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  min-width: 170px;
}

.hero,
.grid {
  display: grid;
  gap: 24px;
}

.hero {
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  align-items: stretch;
}

.grid.cards {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.grid.cards > .panel,
.article-list > .panel,
.data-list > .panel {
  height: 100%;
}

.panel {
  padding: 28px;
}

.panel > :last-child {
  margin-bottom: 0;
}

.hero-panel {
  padding: 34px;
  box-shadow: var(--shadow);
}

.hero-panel h1 {
  font-size: clamp(2.1rem, 4vw, 3.6rem);
  letter-spacing: -0.04em;
  margin-bottom: 18px;
  text-wrap: balance;
}

.hero-panel p {
  font-size: 1.04rem;
  max-width: 64ch;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.section-head p {
  margin: 0;
  max-width: 64ch;
}

.eyebrow {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.badge {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--brand-soft);
  font-size: 0.8rem;
  margin-right: 8px;
  margin-bottom: 8px;
  border: 1px solid rgba(31, 122, 56, 0.08);
}

.badge.warn {
  background: var(--warn-soft);
  color: var(--warn);
  border-color: rgba(138, 90, 0, 0.08);
}

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

.lead {
  font-size: 1.05rem;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.stat-card {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #ffffff, #f8fbf8);
}

.stat-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 6px;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 24px;
  align-items: stretch;
}

.btn,
button,
input[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: linear-gradient(135deg, var(--brand), #2f9c53);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 10px 22px rgba(31, 122, 56, 0.18);
  min-height: 48px;
  min-width: 154px;
}

.btn:hover,
button:hover,
input[type="submit"]:hover {
  text-decoration: none;
  opacity: 0.95;
}

.btn-secondary {
  background: #ffffff;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
}

.cta-row > .btn,
.cta-row > button,
.cta-row > input[type="submit"],
.cta-row > .btn-link {
  flex: 0 0 auto;
}

.highlight-panel {
  background: linear-gradient(135deg, #ffffff, #f5fbf7);
}

.soft-blue {
  background: linear-gradient(180deg, #ffffff, var(--blue-soft));
  border-color: var(--blue-line);
}

.soft-warn {
  background: linear-gradient(180deg, #fffdf8, var(--warn-soft));
  border-color: #ead3ab;
}

.panel-success {
  background: linear-gradient(180deg, #ffffff, #eef9ef);
  border-color: #a8d5ac;
}

.stack > * + * {
  margin-top: 16px;
}

.stack-sm > * + * {
  margin-top: 10px;
}

.stack-lg > * + * {
  margin-top: 24px;
}

.article-list,
.data-list {
  display: grid;
  gap: 16px;
}

.card-title {
  margin-bottom: 8px;
}

.card-title a {
  color: var(--ink);
}

.card-title a:hover {
  color: var(--brand);
}

.meta-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 8px;
}

.info-strip {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

.info-chip {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.step-strip {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.step-strip span {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}

.callout {
  border-left: 4px solid var(--brand);
  padding-left: 16px;
}

.divider {
  height: 1px;
  background: var(--line);
  margin: 24px 0;
}

.inline-form {
  margin: 0;
}

.panel-inline {
  margin: 16px 0;
}

.list-tight li + li {
  margin-top: 10px;
}

.list-compact li + li {
  margin-top: 8px;
}

.content-prose {
  max-width: 74ch;
}

.field-group ul {
  margin-top: 4px;
}

.field-group {
  display: grid;
  gap: 8px;
}

.state-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.parent-grid {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.calculator-shell {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(300px, 0.9fr);
  align-items: start;
}

.parent-card {
  background: linear-gradient(180deg, #ffffff, #f8fcf8);
}

.compact-parent {
  gap: 16px;
}

.trait-stack {
  display: grid;
  gap: 14px;
}

.trait-row {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1.45fr) minmax(180px, 1fr);
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
}

.inline-actions {
  display: flex;
  margin-top: 14px;
}

.result-preview {
  position: sticky;
  top: 20px;
  background: linear-gradient(180deg, #ffffff, #f7fbff);
}

.result-list {
  display: grid;
  gap: 12px;
}

.result-item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
}

.empty-result {
  padding: 18px;
  border: 1px dashed var(--line-strong);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.66);
}

.result-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

input[type="text"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 12px 14px;
  margin-top: 8px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 148px;
  resize: vertical;
}

.footer {
  margin-top: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 252, 248, 0.95));
}

@media (max-width: 1024px) {
  .shell {
    padding: 20px 20px 40px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .nav {
    top: 12px;
  }
}

@media (max-width: 800px) {
  .nav,
  .footer {
    flex-direction: column;
    align-items: stretch;
  }

  .calculator-shell {
    grid-template-columns: 1fr;
  }

  .nav {
    position: static;
  }

  .nav-brand,
  .nav-auth {
    min-width: 0;
  }

  .nav-links,
  .nav-auth {
    justify-content: flex-start;
  }

  .nav-links {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }

  .nav-links a {
    flex: 0 0 auto;
  }

  .hero-panel {
    padding: 28px;
  }

  .panel {
    padding: 22px;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .trait-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .shell {
    padding: 14px 14px 32px;
  }

  main {
    gap: 20px;
  }

  .nav,
  .footer,
  .panel,
  .hero-panel {
    border-radius: 20px;
  }

  .nav,
  .footer,
  .panel {
    padding: 18px;
  }

  .nav-links {
    gap: 8px;
  }

  .nav-auth a,
  .btn,
  button,
  input[type="submit"] {
    width: 100%;
  }

  .nav-links a,
  .btn-link {
    width: auto;
  }

  .cta-row > * {
    width: 100%;
  }

  .cta-row > .btn-link {
    width: 100%;
    justify-content: center;
  }

  .stats-grid,
  .grid.cards,
  .state-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .info-strip,
  .meta-row,
  .step-strip {
    gap: 10px;
  }

  .hero-panel h1 {
    font-size: 1.9rem;
  }
}