:root {
  --bg: #f4f8fa;
  --panel: rgba(255, 255, 255, 0.95);
  --panel-strong: #ffffff;
  --text: #10233f;
  --muted: #54677a;
  --line: rgba(164, 204, 215, 0.8);
  --brand: #7e1a35;
  --brand-dark: #17384f;
  --accent: #2f7089;
  --shadow: 0 18px 40px rgba(17, 35, 54, 0.12);
}

body.theme-dark {
  --bg: #091722;
  --panel: rgba(15, 30, 43, 0.94);
  --panel-strong: #10202f;
  --text: #edf6ff;
  --muted: #adc0d0;
  --line: rgba(78, 113, 133, 0.76);
  --brand: #f38bab;
  --brand-dark: #9fd4e3;
  --accent: #66b6d3;
  --shadow: 0 22px 44px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(121, 176, 192, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(126, 26, 53, 0.12), transparent 26%),
    var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px 18px;
  background: linear-gradient(180deg, rgba(11, 29, 55, 0.98), rgba(23, 56, 79, 0.96), rgba(126, 26, 53, 0.92));
  color: #eff6ff;
  border-right: 1px solid rgba(167, 220, 232, 0.28);
  display: grid;
  gap: 18px;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05));
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.brand small {
  display: block;
  color: rgba(226, 239, 248, 0.78);
  margin-top: 4px;
}

.search-box {
  display: grid;
  gap: 8px;
  font-size: 0.88rem;
}

.search-box input,
#toggle-theme,
#expand-all {
  border: 1px solid rgba(170, 220, 232, 0.28);
  border-radius: 12px;
  padding: 11px 12px;
  background: rgba(255, 255, 255, 0.08);
  color: #eff6ff;
}

.search-box input::placeholder {
  color: rgba(239, 246, 255, 0.62);
}

.side-nav {
  display: grid;
  gap: 6px;
}

.side-nav a {
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 12px;
  color: rgba(237, 246, 255, 0.86);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.side-nav a:hover,
.side-nav a.is-active {
  background: rgba(255, 255, 255, 0.12);
  transform: translateX(2px);
}

.sidebar-footer {
  display: grid;
  gap: 8px;
}

.content {
  padding: 28px;
  display: grid;
  gap: 22px;
}

.manual-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 26px;
}

.manual-section.is-hidden {
  display: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 22px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--brand);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
}

.hero h1,
.section-head h2 {
  margin: 0;
  line-height: 1.08;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.hero h1 span {
  color: var(--brand);
}

.hero-text {
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.primary-link,
.secondary-link,
button {
  border: 0;
  border-radius: 999px;
  padding: 11px 16px;
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
}

.primary-link,
button {
  background: linear-gradient(135deg, var(--brand), #a3274b);
  color: #ffffff;
  box-shadow: 0 12px 22px rgba(126, 26, 53, 0.22);
}

.secondary-link {
  color: var(--brand-dark);
  background: rgba(47, 112, 137, 0.12);
  border: 1px solid rgba(47, 112, 137, 0.18);
}

.hero-card {
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel-strong);
}

.hero-card img {
  display: block;
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.hero-card-body {
  padding: 18px;
}

.hero-card-body ul,
.info-card ul,
.info-card ol {
  margin: 12px 0 0;
  padding-left: 18px;
}

.section-head {
  margin-bottom: 16px;
}

.card-grid {
  display: grid;
  gap: 14px;
}

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

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

.info-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  background:
    radial-gradient(circle at top right, rgba(151, 202, 216, 0.16), transparent 44%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 251, 0.96));
}

body.theme-dark .info-card {
  background:
    radial-gradient(circle at top right, rgba(102, 182, 211, 0.14), transparent 44%),
    linear-gradient(180deg, rgba(15, 30, 43, 0.98), rgba(13, 25, 36, 0.98));
}

.info-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
}

.info-card p,
.info-card li,
.manual-footer p,
.timeline-step p {
  color: var(--muted);
  line-height: 1.7;
}

code {
  font-family: "SFMono-Regular", Consolas, monospace;
  background: rgba(16, 35, 63, 0.08);
  border: 1px solid rgba(16, 35, 63, 0.12);
  border-radius: 8px;
  padding: 2px 6px;
  color: var(--brand-dark);
}

body.theme-dark code {
  background: rgba(159, 212, 227, 0.1);
  border-color: rgba(159, 212, 227, 0.15);
  color: #d9eff8;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  background: var(--panel-strong);
}

.timeline-step span {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
}

.timeline-step h3 {
  margin: 0 0 6px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  background: var(--panel-strong);
}

summary {
  cursor: pointer;
  font-weight: 700;
}

details p {
  margin: 12px 0 0;
  color: var(--muted);
}

.manual-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 22px 26px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(11, 29, 55, 0.98), rgba(28, 76, 95, 0.94), rgba(126, 26, 53, 0.92));
  color: #eff6ff;
  box-shadow: var(--shadow);
}

.manual-footer p {
  color: rgba(239, 246, 255, 0.82);
}

.manual-footer img {
  max-width: 120px;
  filter: brightness(1.02);
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 280px 1fr;
  }

  .card-grid.three,
  .card-grid.two,
  .hero,
  .timeline-step {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(167, 220, 232, 0.28);
  }

  .content {
    padding: 18px;
  }

  .manual-section,
  .manual-footer {
    padding: 20px;
  }

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

@media (max-width: 640px) {
  .side-nav {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .manual-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}