:root {
  color-scheme: dark;
  --bg-page: #040510;
  --bg-surface: #080b1c;
  --bg-elevated: rgba(13, 18, 42, 0.92);
  --bg-overlay: rgba(16, 22, 48, 0.78);
  --border-soft: rgba(129, 140, 248, 0.22);
  --border-strong: rgba(99, 102, 241, 0.48);
  --text-primary: #e8ebff;
  --text-secondary: rgba(232, 235, 255, 0.74);
  --text-muted: rgba(203, 213, 225, 0.65);
  --accent-primary: #6366f1;
  --accent-secondary: #22d3ee;
  --accent-tertiary: #f97316;
  --accent-warning: #facc15;
  --focus-ring: rgba(129, 140, 248, 0.38);
  --card-gradient: var(--surface-gradient-primary);
  --panel-gradient: linear-gradient(135deg, rgba(14, 20, 48, 0.85), rgba(30, 58, 138, 0.65));
  --transition: 0.18s ease;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Inter", "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 18% 20%, rgba(88, 132, 255, 0.22), transparent 58%),
    radial-gradient(circle at 82% 18%, rgba(48, 196, 255, 0.16), transparent 55%),
    radial-gradient(circle at 70% 84%, rgba(60, 120, 235, 0.14), transparent 60%),
    var(--bg-page);
  -webkit-font-smoothing: antialiased;
}

body.has-mobile-nav-open {
  overflow: hidden;
}

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

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

main {
  display: block;
}

/* Global navigation */
.global-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  --nav-padding: clamp(1.5rem, 4vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  gap: clamp(0.6rem, 1vw, 1rem);
  padding: 1rem var(--nav-padding);
  background: linear-gradient(135deg, rgba(14, 20, 48, 0.96), rgba(24, 30, 68, 0.92));
  border-bottom: 1px solid rgba(129, 140, 248, 0.28);
  box-shadow: 0 20px 40px rgba(3, 7, 18, 0.55);
  backdrop-filter: blur(16px);
}

.global-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: clamp(0.7rem, 1vw, 1rem);
  margin-right: clamp(0.65rem, 2vw, 1.5rem);
  text-decoration: none;
  color: inherit;
  flex: 0 1 auto;
  min-width: 0;
}

.global-nav__menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  border: 1px solid rgba(129, 140, 248, 0.35);
  background: rgba(12, 16, 36, 0.85);
  color: #f8faff;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
  margin-left: auto;
}

.global-nav__menu-toggle:hover,
.global-nav__menu-toggle:focus-visible {
  outline: none;
  background: rgba(18, 22, 48, 0.95);
  border-color: rgba(129, 140, 248, 0.6);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
}

.global-nav__menu-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform var(--transition), background var(--transition);
}

.global-nav__menu-toggle-icon::before,
.global-nav__menu-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform var(--transition), opacity var(--transition);
}

.global-nav__menu-toggle-icon::before {
  transform: translateY(-6px);
}

.global-nav__menu-toggle-icon::after {
  transform: translateY(6px);
}

.global-nav--menu-open .global-nav__menu-toggle-icon {
  background: transparent;
}

.global-nav--menu-open .global-nav__menu-toggle-icon::before {
  transform: rotate(45deg);
}

.global-nav--menu-open .global-nav__menu-toggle-icon::after {
  transform: rotate(-45deg);
}

.global-nav__logo {
  height: clamp(44px, 8vw, 58px);
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 8px 16px rgba(3, 7, 18, 0.55));
}

.global-nav__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.global-nav__overline {
  font-size: clamp(0.6rem, 0.7vw, 0.72rem);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(232, 235, 255, 0.62);
}

.global-nav__title {
  font-size: clamp(0.98rem, 1.1vw + 0.7rem, 1.35rem);
  font-weight: 600;
  color: #f8faff;
  white-space: normal;
}

.global-nav__menu {
  position: absolute;
  top: calc(100% + 0.55rem);
  left: auto;
  right: var(--nav-padding);
  width: min(360px, calc(100% - 2 * var(--nav-padding)));
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 1.1rem 1.4rem 1.6rem;
  background: linear-gradient(135deg, rgba(14, 20, 48, 0.96), rgba(24, 30, 68, 0.92));
  border: 1px solid rgba(129, 140, 248, 0.32);
  border-radius: 20px;
  box-shadow: 0 26px 48px rgba(5, 9, 24, 0.6);
  backdrop-filter: blur(12px);
  z-index: 120;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.global-nav--menu-open .global-nav__menu {
  display: flex;
}

.global-nav__item {
  position: relative;
  width: 100%;
}

.global-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.55rem clamp(0.85rem, 1.2vw, 1.2rem);
  border-radius: 999px;
  font-size: clamp(0.85rem, 0.55vw + 0.7rem, 1.05rem);
  font-weight: 500;
  color: rgba(232, 235, 255, 0.9);
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  text-align: left;
}

.global-nav__link:hover,
.global-nav__link:focus-visible {
  color: #f8faff;
  background: rgba(129, 140, 248, 0.2);
  border-color: rgba(129, 140, 248, 0.45);
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.25);
  outline: none;
}

.global-nav__link--active {
  background: rgba(129, 140, 248, 0.25);
  border-color: rgba(129, 140, 248, 0.6);
  color: #f8faff;
  box-shadow: 0 12px 24px rgba(99, 102, 241, 0.3);
}

.global-nav__toggle {
  background: none;
  cursor: pointer;
}

.global-nav__caret {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid rgba(232, 235, 255, 0.8);
  transition: transform 0.2s ease;
  margin-top: 2px;
  margin-left: auto;
}

.global-nav__item--open .global-nav__caret {
  transform: rotate(-180deg);
}

.global-nav__dropdown {
  display: none;
  flex-direction: column;
  gap: 0.45rem;
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.6rem;
  background: rgba(10, 14, 34, 0.9);
  border: 1px solid rgba(129, 140, 248, 0.22);
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(3, 7, 18, 0.4);
}

.global-nav__item--open .global-nav__dropdown {
  display: flex;
}

.global-nav__dropdown-link {
  display: block;
  padding: 0.65rem 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  color: rgba(232, 235, 255, 0.92);
  transition: background var(--transition), color var(--transition);
}

.global-nav__dropdown-link:hover,
.global-nav__dropdown-link:focus-visible {
  background: rgba(129, 140, 248, 0.25);
  color: #f8faff;
  outline: none;
}

/* Page layout */
.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4.5rem;
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vw, 3rem);
}

/* Study toolbar */
.card {
  background: var(--card-gradient);
  border-radius: 22px;
  padding: clamp(1.8rem, 3vw, 2.4rem);
  box-shadow: 0 28px 60px rgba(3, 7, 18, 0.65);
  border: 1px solid var(--border-soft);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, 2.6vw, 2rem);
}

.study-toolbar {
  gap: clamp(1.5rem, 2.4vw, 2.1rem);
}

.study-toolbar__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  justify-content: space-between;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 999px;
  padding: 0.75rem 1.6rem;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.nav-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  color: #f8faff;
  box-shadow: 0 18px 32px rgba(34, 211, 238, 0.25);
}

.nav-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 22px 38px rgba(34, 211, 238, 0.35);
}

.nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.slide-counter {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  background: rgba(12, 16, 36, 0.82);
  border: 1px solid rgba(129, 140, 248, 0.28);
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.slide-counter .divider {
  color: rgba(148, 163, 184, 0.45);
}

/* Slideshow */
.slideshow-card {
  padding: clamp(1.6rem, 2.8vw, 2.1rem);
}

.slideshow-container {
  display: flex;
  flex-direction: column;
  gap: clamp(1.6rem, 2.8vw, 2.2rem);
}

.slide {
  display: none;
  background: rgba(12, 16, 36, 0.88);
  border-radius: 20px;
  padding: clamp(1.8rem, 3vw, 2.4rem);
  border: 1px solid rgba(129, 140, 248, 0.22);
  box-shadow: inset 0 0 0 1px rgba(3, 7, 18, 0.38);
}

.slide.active {
  display: block;
  animation: slideIn 0.45s ease forwards;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-content {
  display: flex;
  flex-direction: column;
  gap: clamp(1.4rem, 2.4vw, 1.9rem);
}

.slide-content h2 {
  font-size: clamp(1.8rem, 3vw, 2.25rem);
  font-weight: 600;
  color: #f8faff;
}

.content-section {
  display: flex;
  flex-direction: column;
  gap: clamp(1.2rem, 2vw, 1.6rem);
  background: rgba(16, 22, 48, 0.62);
  border-radius: 18px;
  padding: clamp(1.25rem, 2vw, 1.6rem);
  border: 1px solid rgba(129, 140, 248, 0.22);
}

.content-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-secondary);
}

.content-section h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.content-section ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-secondary);
  display: grid;
  gap: 0.45rem;
}

.key-takeaway,
.important-note,
.availability-note,
.exam-notes,
.conversion {
  background: rgba(129, 140, 248, 0.18);
  border: 1px solid rgba(129, 140, 248, 0.32);
  border-radius: 16px;
  padding: 1rem 1.25rem;
  color: var(--text-primary);
}

.key-takeaway strong,
.important-note strong,
.availability-note strong,
.exam-notes strong,
.conversion strong {
  color: var(--accent-secondary);
}

.definition-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.definition-item {
  background: rgba(12, 16, 36, 0.7);
  border: 1px solid rgba(129, 140, 248, 0.24);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  color: var(--text-secondary);
}

.system-types {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.system-type,
.training-type,
.rule-group,
.duty-section,
.action-group,
.orc-section {
  background: rgba(12, 16, 36, 0.7);
  border: 1px solid rgba(129, 140, 248, 0.24);
  border-radius: 16px;
  padding: 1.2rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.classification-table,
.training-table,
.orc-table {
  display: grid;
  gap: 0.65rem;
  background: rgba(12, 16, 36, 0.7);
  border-radius: 16px;
  border: 1px solid rgba(129, 140, 248, 0.24);
  padding: 1rem 1.1rem;
}

.table-header,
.table-row,
.training-row,
.experience-row,
.fee-item {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  align-items: center;
  color: var(--text-secondary);
}

.table-header,
.training-table .table-header,
.orc-table .table-header {
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.class-d {
  color: #38bdf8;
  font-weight: 600;
}

.class-c {
  color: #f472b6;
  font-weight: 600;
}

.class-b {
  color: #facc15;
  font-weight: 600;
}

.class-a {
  color: #4ade80;
  font-weight: 600;
}

.system-classification {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.key-factors,
.special-rules,
.substitution-rules,
.process-steps,
.training-types,
.renewal-steps,
.orc-details,
.owner-duties,
.enforcement-actions {
  display: grid;
  gap: 1rem;
}

.process-steps,
.training-types,
.renewal-steps,
.orc-details,
.owner-duties,
.enforcement-actions {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.step,
.training-type,
.renewal-step,
.orc-section,
.duty-section,
.action-group {
  position: relative;
}

.step-number {
  position: absolute;
  top: -16px;
  left: -16px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #f8faff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  box-shadow: 0 14px 28px rgba(34, 211, 238, 0.3);
}

.step-content {
  padding-top: 0.4rem;
  color: var(--text-secondary);
}

.experience-table,
.fee-structure {
  display: grid;
  gap: 0.75rem;
}

.class-label {
  font-weight: 600;
  color: var(--text-primary);
}

.time-req {
  text-align: right;
  font-weight: 600;
  color: var(--accent-secondary);
}

.training-table .training-row span:last-child,
.fee-item span:last-child {
  text-align: right;
  font-weight: 600;
  color: var(--accent-secondary);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4ade80, #22c55e);
  box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.18);
  display: inline-block;
  margin-right: 0.5rem;
}

.page-footer {
  text-align: center;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--text-muted);
}

/* Responsive tweaks */
@media (min-width: 960px) {
  .study-toolbar__nav {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .page {
    padding: 2.5rem 1.25rem 3.5rem;
  }

  .global-nav__menu {
    width: calc(100% - 2 * var(--nav-padding));
    right: var(--nav-padding);
  }

  .study-toolbar__nav {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-btn {
    width: 100%;
  }

  .slide {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 1.6rem 1.2rem;
    border-radius: 22px;
  }

  .card {
    padding: 1.6rem 1.4rem;
    border-radius: 20px;
  }
}