:root {
  color-scheme: dark;
  --bg: #101318;
  --bg-2: #151a21;
  --surface: #1a2029;
  --surface-2: #212936;
  --text: #f5f7fb;
  --muted: #aeb7c7;
  --line: #30394a;
  --green: #55d6a2;
  --coral: #ff7a6b;
  --gold: #f6c85f;
  --sky: #73c7ff;
  --violet: #b89cff;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.28);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(85, 214, 162, 0.06), transparent 380px),
    var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--green);
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.6rem 0.8rem;
  background: var(--green);
  color: #07100c;
  border-radius: 6px;
  font-weight: 800;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(16, 19, 24, 0.9);
  backdrop-filter: blur(14px);
}

.header-inner,
.footer-inner,
.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 900;
  letter-spacing: 0;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a,
.button,
button {
  border-radius: 6px;
  min-height: 40px;
}

.nav a {
  padding: 0.48rem 0.68rem;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 750;
}

.nav a:hover,
.nav a:focus-visible {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  outline: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  gap: clamp(1.2rem, 3vw, 2.6rem);
  align-items: center;
  padding: clamp(2.2rem, 6vw, 4.5rem) 0 2rem;
}

.hero-copy {
  min-width: 0;
}

.hero h1,
.article-hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.25rem, 7vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.article-hero h1 {
  font-size: clamp(2.1rem, 6vw, 4.2rem);
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.22rem);
  line-height: 1.7;
}

.hero-actions,
.action-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: 1px solid transparent;
  padding: 0.72rem 0.95rem;
  font-weight: 850;
  line-height: 1.1;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  outline: 2px solid rgba(85, 214, 162, 0.42);
  outline-offset: 2px;
}

.button.primary {
  background: var(--green);
  color: #07100c;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.12);
}

.hero-media {
  position: relative;
}

.media-frame {
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-media .media-frame {
  aspect-ratio: 16 / 9;
}

.image-caption {
  margin: 0.65rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.stats-grid,
.card-grid,
.quick-grid,
.source-grid,
.tier-grid {
  display: grid;
  gap: 1rem;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 1.5rem 0 2rem;
}

.quick-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.source-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tier-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.stat-card,
.quick-card,
.tool-panel,
.callout,
.faq details,
.tier-card {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: rgba(26, 32, 41, 0.82);
}

.card,
.quick-card,
.tier-card {
  padding: 1.1rem;
}

.stat-card {
  padding: 1rem;
}

.stat-label,
.small-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stat-value {
  margin-top: 0.25rem;
  font-size: clamp(1.35rem, 3vw, 2.1rem);
  font-weight: 950;
  line-height: 1.1;
}

.stat-note {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.quick-card {
  min-height: 130px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--text);
}

.quick-card strong {
  font-size: 1rem;
}

.quick-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.quick-card:hover,
.quick-card:focus-visible {
  border-color: rgba(85, 214, 162, 0.5);
  background: rgba(33, 41, 54, 0.92);
  outline: none;
}

.section {
  padding: clamp(2.3rem, 5vw, 4.2rem) 0;
}

.section.compact {
  padding: 1.2rem 0;
}

.section-header {
  margin-bottom: 1.2rem;
}

.section h2,
.article-content h2 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.55rem, 3.6vw, 2.45rem);
  line-height: 1.08;
  letter-spacing: 0;
}

.article-content h3,
.card h3,
.tier-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.18rem;
  line-height: 1.25;
}

.section p,
.article-content p,
.card p,
.tier-card p,
.callout p {
  color: var(--muted);
}

.article-hero {
  padding: clamp(2rem, 5vw, 3.8rem) 0 1rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.breadcrumb a:hover {
  color: var(--green);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 2rem;
  align-items: start;
}

.article-content {
  min-width: 0;
}

.aside-panel {
  position: sticky;
  top: 88px;
}

.callout {
  padding: 1.05rem;
  margin: 1.1rem 0;
}

.callout.good {
  border-color: rgba(85, 214, 162, 0.34);
  background: rgba(85, 214, 162, 0.1);
}

.callout.warn {
  border-color: rgba(246, 200, 95, 0.38);
  background: rgba(246, 200, 95, 0.11);
}

.callout.coral {
  border-color: rgba(255, 122, 107, 0.36);
  background: rgba(255, 122, 107, 0.1);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin: 1rem 0 1.3rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
  vertical-align: top;
}

th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1rem 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--muted);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.88rem;
  font-weight: 750;
}

.accent-green {
  color: var(--green);
}

.accent-coral {
  color: var(--coral);
}

.accent-gold {
  color: var(--gold);
}

.accent-sky {
  color: var(--sky);
}

.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 1.2rem;
  align-items: start;
}

.tool-panel {
  padding: 1.1rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

label {
  display: grid;
  gap: 0.35rem;
  color: var(--text);
  font-weight: 800;
}

input {
  width: 100%;
  min-height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 0.62rem 0.7rem;
  font: inherit;
}

input:focus-visible {
  outline: 2px solid rgba(85, 214, 162, 0.5);
  outline-offset: 2px;
}

.results {
  display: grid;
  gap: 0.75rem;
}

.result-box {
  padding: 0.85rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.result-box strong {
  display: block;
  font-size: 1.7rem;
  line-height: 1.15;
}

.faq {
  display: grid;
  gap: 0.75rem;
}

.faq details {
  padding: 0.85rem 1rem;
}

.faq summary {
  cursor: pointer;
  color: var(--text);
  font-weight: 850;
}

.faq summary:focus-visible {
  outline: 2px solid rgba(85, 214, 162, 0.5);
  outline-offset: 4px;
  border-radius: 4px;
}

.faq details p {
  margin: 0.75rem 0 0;
}

.timeline {
  display: grid;
  gap: 1rem;
  border-left: 2px solid rgba(85, 214, 162, 0.36);
  padding-left: 1rem;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1rem - 6px);
  top: 0.45rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
}

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.14);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  padding: 2rem 0 5.2rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.mobile-quick-nav {
  display: none;
}

.source-link {
  color: var(--green);
  overflow-wrap: anywhere;
}

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

.gallery .media-frame {
  aspect-ratio: 16 / 9;
}

.not-found {
  min-height: 62vh;
  display: grid;
  place-items: center;
  text-align: center;
}

@media (max-width: 920px) {
  .hero,
  .article-layout,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid,
  .quick-grid,
  .card-grid,
  .source-grid,
  .tier-grid,
  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .aside-panel {
    position: static;
  }

  .nav {
    display: none;
  }

  .mobile-quick-nav {
    position: fixed;
    z-index: 60;
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.25rem;
    padding: 0.35rem;
    border-radius: 8px;
    background: rgba(16, 19, 24, 0.94);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(14px);
    box-shadow: var(--shadow);
  }

  .mobile-quick-nav a {
    display: flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 850;
  }

  .mobile-quick-nav a:hover,
  .mobile-quick-nav a:focus-visible {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
    outline: none;
  }
}

@media (max-width: 640px) {
  .header-inner,
  .footer-inner,
  .page-shell {
    width: min(100% - 24px, 1120px);
  }

  .hero {
    padding-top: 1.7rem;
  }

  .stats-grid,
  .quick-grid,
  .card-grid,
  .source-grid,
  .tier-grid,
  .gallery,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .action-row {
    align-items: stretch;
  }

  .button {
    width: 100%;
  }
}