:root {
  --white: #ffffff;
  --light: #f6f4ee;
  --text: #1b1b1b;
  --muted: #69665f;
  --gold: #d1a13a;
  --gold-dark: #966c16;
  --dark: #111111;
  --border: #e2ddd2;
  --radius: 18px;
  --shadow: 0 16px 42px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
}

a {
  color: var(--gold-dark);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.container {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.narrow {
  width: min(800px, calc(100% - 36px));
}

.section {
  padding: 85px 0;
}

.section-light {
  background: var(--light);
}

.section-dark {
  color: var(--white);
  background: var(--dark);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 10px 15px;
  color: #111;
  background: #fff;
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(17, 17, 17, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
}

.brand-icon {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  color: #111;
  font-weight: 900;
  border-radius: 12px;
  background: linear-gradient(135deg, #f3d171, #a87310);
}

.brand-text strong,
.brand-text small {
  display: block;
}

.brand-text small {
  color: #aaa;
  font-size: 12px;
}

.main-menu {
  display: flex;
  align-items: center;
  gap: 23px;
}

.main-menu a {
  color: #fff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
}

.main-menu a:hover {
  color: #f3d171;
}

.menu-toggle {
  width: 44px;
  height: 44px;
  display: none;
  padding: 10px;
  border: 0;
  border-radius: 10px;
  background: #252525;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: #fff;
}

.hero-section {
  color: #fff;
  background:
    radial-gradient(circle at top right, rgba(209, 161, 58, 0.19), transparent 34%),
    linear-gradient(180deg, #171717, #101010);
}

.hero-grid {
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(300px, 0.7fr);
  align-items: center;
  gap: 55px;
  padding-top: 80px;
  padding-bottom: 80px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold-dark);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.hero-section .eyebrow,
.section-dark .eyebrow {
  color: #f3d171;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.2;
}

h1 {
  max-width: 850px;
  margin-bottom: 22px;
  font-size: clamp(42px, 6vw, 75px);
  letter-spacing: -3px;
}

h2 {
  font-size: clamp(29px, 4vw, 44px);
  letter-spacing: -1.5px;
}

h3 {
  font-size: 21px;
}

.hero-description {
  max-width: 760px;
  color: #ddd;
  font-size: 18px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0 23px;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 23px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 900;
}

.button-primary {
  color: #111;
  background: linear-gradient(135deg, #f3d171, #b67d15);
}

.button-outline {
  color: #fff;
  border: 1px solid #555;
}

.hero-notice {
  max-width: 750px;
  color: #aaa;
  font-size: 14px;
}

.summary-card,
.toc-card,
.feature-card,
.faq-item {
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.summary-card {
  padding: 28px;
}

.summary-card h2 {
  font-size: 25px;
}

.summary-card dl {
  margin: 0;
}

.summary-card dl div {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
}

.summary-card dl div:last-child {
  border-bottom: 0;
}

.summary-card dt {
  color: var(--muted);
}

.summary-card dd {
  margin: 0;
  text-align: right;
  font-weight: 800;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: 58px;
}

.article-content h2 {
  margin-top: 55px;
}

.article-content p {
  margin-bottom: 21px;
}

.toc-card {
  position: sticky;
  top: 95px;
  padding: 24px;
}

.toc-card h2 {
  font-size: 21px;
}

.toc-card a {
  display: block;
  padding: 10px 0;
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}

.steps {
  padding-left: 23px;
}

.steps li {
  margin-bottom: 18px;
  padding-left: 8px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 35px;
}

.feature-card {
  padding: 24px;
}

.feature-card p {
  color: var(--muted);
}

.table-wrapper {
  margin-top: 30px;
  overflow-x: auto;
  border: 1px solid #333;
  border-radius: var(--radius);
}

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

th,
td {
  padding: 16px 18px;
  text-align: left;
  border-bottom: 1px solid #303030;
}

th {
  width: 35%;
  color: #f3d171;
}

.check-list {
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 13px 0 13px 35px;
  border-bottom: 1px solid var(--border);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--gold-dark);
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.faq-item {
  overflow: hidden;
  box-shadow: none;
}

.faq-question {
  position: relative;
  width: 100%;
  padding: 20px 55px 20px 22px;
  text-align: left;
  font: inherit;
  font-weight: 900;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 22px;
  font-size: 25px;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding: 0 22px 20px;
  color: var(--muted);
}

.faq-item.open .faq-answer {
  display: block;
}

.site-footer {
  padding: 48px 0 25px;
  color: #aaa;
  background: #090909;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 35px;
}

.footer-content strong {
  color: #fff;
}

.footer-content nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-content nav a {
  color: #ddd;
  text-decoration: none;
}

.copyright {
  margin-top: 28px;
  padding-top: 24px;
  font-size: 14px;
  border-top: 1px solid #262626;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  opacity: 0;
  pointer-events: none;
  color: #111;
  background: var(--gold);
  border: 0;
  border-radius: 50%;
  box-shadow: var(--shadow);
  font-size: 22px;
  font-weight: 900;
  cursor: pointer;
  transition: 0.2s ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 920px) {
  .menu-toggle {
    display: block;
  }

  .main-menu {
    position: absolute;
    top: 74px;
    left: 18px;
    right: 18px;
    display: none;
    padding: 18px;
    background: #1a1a1a;
    border-radius: 14px;
    flex-direction: column;
    align-items: stretch;
  }

  .main-menu.open {
    display: flex;
  }

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

  .hero-grid {
    min-height: auto;
  }

  .toc-card {
    position: static;
  }

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

@media (max-width: 620px) {
  .section {
    padding: 65px 0;
  }

  .hero-grid {
    gap: 35px;
    padding-top: 65px;
    padding-bottom: 65px;
  }

  h1 {
    font-size: 43px;
    letter-spacing: -2px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

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

  .footer-content {
    flex-direction: column;
  }
}