@import url("./reveal.css");

:root {
  --font-sans: "Montserrat", system-ui, -apple-system, sans-serif;
  --nav-h: 68px;
  --nav-blue: #0b73b7;
  --nav-blue-dark: #085a92;
  --nav-cta: #2f80ed;
  --nav-ink: #152033;
  --nav-muted: #5c6b7d;
  --nav-line: #e6eef6;
  --nav-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

.site-header,
.site-header * {
  box-sizing: border-box;
  font-family: var(--font-sans);
}

.courses-mega,
.courses-mega * {
  box-sizing: border-box;
  font-family: var(--font-sans);
}

.site-header a,
.site-header a:link,
.site-header a:visited,
.courses-mega a,
.courses-mega a:link,
.courses-mega a:visited {
  font-family: var(--font-sans);
  font-style: normal;
  text-decoration: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  overflow: visible;
  background: transparent;
  border-bottom: 0;
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  height: 3px;
  background: linear-gradient(90deg, #0b73b7 0%, #3aa07a 52%, #6da800 100%);
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 0;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-scrolled::after {
  background: rgba(255, 255, 255, 0.98);
  border-bottom-color: var(--nav-line);
  box-shadow: var(--nav-shadow);
}

.site-header__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: min(1180px, calc(100% - 32px));
  height: 100%;
  margin: 0 auto;
}

.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-logo img {
  display: block;
  height: 42px;
  width: auto;
}

.site-header__panel {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link,
.site-nav__trigger {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 0;
  background: transparent;
  color: var(--nav-ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.site-nav__link::after,
.site-nav__trigger::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--nav-blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link.is-active,
.site-nav__trigger:hover,
.courses-nav.is-open > .site-nav__trigger {
  color: var(--nav-blue);
}

.site-nav__link:hover::after,
.site-nav__link.is-active::after,
.site-nav__trigger:hover::after,
.courses-nav.is-open > .site-nav__trigger::after {
  transform: scaleX(1);
}

.site-nav__chevron {
  width: 11px;
  height: 11px;
  color: #7b8898;
  transition: transform 0.2s ease, color 0.2s ease;
}

.courses-nav.is-open .site-nav__chevron,
.site-nav__trigger:hover .site-nav__chevron {
  color: var(--nav-blue);
  transform: rotate(180deg);
}

.site-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-left: 10px;
  padding: 10px 20px;
  border-radius: 999px;
  background: linear-gradient(180deg, #4a92f2 0%, #2f80ed 100%);
  color: #fff !important;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 18px rgba(47, 128, 237, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.site-cta:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
  box-shadow: 0 10px 22px rgba(47, 128, 237, 0.36);
}

.site-cta i {
  font-size: 11px;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: auto;
  height: 40px;
  margin-left: auto;
  padding: 3px;
  flex-shrink: 0;
  border: 1px solid var(--nav-line);
  border-radius: 999px;
  background: #eef3f8;
  color: var(--nav-ink);
  cursor: pointer;
  z-index: 2;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--nav-blue);
}

.theme-toggle__option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  color: #7b8898;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle__icon {
  width: 16px;
  height: 16px;
  display: block;
}

html:not(.theme-dark) .theme-toggle__option--light {
  background: #ffffff;
  color: #f59e0b;
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.12);
}

html.theme-dark .theme-toggle__option--dark {
  background: #27272a;
  color: #f4f4f5;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
}

@media (min-width: 981px) {
  .theme-toggle {
    margin-left: 8px;
  }
}

.nav-burger {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: #f3f7fb;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-burger span {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--nav-ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header.is-open .nav-burger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.is-open .nav-burger span:nth-child(2) {
  opacity: 0;
}

.site-header.is-open .nav-burger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__overlay {
  display: none;
}

.courses-nav {
  position: relative;
}

.courses-mega {
  display: none;
}

.courses-mega.is-open {
  display: block;
}

.courses-mega-bridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 100%;
  height: var(--courses-mega-gap, 68px);
}

.courses-mega__panel {
  overflow: hidden;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--nav-line);
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

.courses-mega__categories {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px 28px;
  padding: 28px 32px 20px;
}

.courses-mega__col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: #6b7787;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.courses-mega__col-title::before {
  content: "";
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--nav-blue);
}

.courses-mega__link,
.courses-mega__link:link,
.courses-mega__link:visited {
  display: flex;
  align-items: center;
  min-height: 34px;
  padding: 4px 0;
  color: #334155;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  transition: color 0.15s ease, padding-left 0.15s ease;
}

.courses-mega__link:hover {
  color: var(--nav-blue);
  padding-left: 4px;
}

.courses-mega__link-text,
.courses-mega__card-title,
.courses-mega__card-meta {
  font-family: var(--font-sans);
}

.courses-mega__link-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.courses-mega__top {
  padding: 18px 32px 22px;
  border-top: 1px solid var(--nav-line);
  background: #f7fafc;
}

.courses-mega__top-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--nav-ink);
  font-size: 13px;
  font-weight: 700;
}

.courses-mega__top-title i {
  color: var(--nav-blue);
}

.courses-mega__cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.courses-mega__card,
.courses-mega__card:link,
.courses-mega__card:visited {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  min-height: 68px;
  padding: 10px 12px;
  overflow: hidden;
  border: 1px solid #e1e8ef;
  border-radius: 12px;
  background: #fff;
  color: #1e293b;
  font-family: var(--font-sans);
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.courses-mega__card:hover {
  border-color: #c5daf0;
  box-shadow: 0 8px 18px rgba(11, 115, 183, 0.08);
  transform: translateY(-1px);
}

.courses-mega__icon {
  display: block;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 10px;
  background:
    linear-gradient(#fff, #fff) 50% 54%/14px 9px no-repeat,
    linear-gradient(180deg, #1490d2, #0b73b7);
}

.courses-mega__card-copy {
  min-width: 0;
  flex: 1;
}

.courses-mega__card-title {
  display: block;
  color: #1e293b;
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.courses-mega__card-meta {
  display: block;
  margin-top: 3px;
  color: #64748b;
  font-size: 12px;
}

.courses-mega__footer {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  border-top: 1px solid var(--nav-line);
  background: #fff;
}

.courses-mega__all,
.courses-mega__all:link,
.courses-mega__all:visited {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--nav-blue);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 700;
  text-decoration: none;
}

.courses-mega__all:hover {
  color: var(--nav-blue-dark);
}

@media (min-width: 981px) {
  .courses-mega {
    position: fixed;
    left: 50%;
    top: calc(var(--courses-mega-top, 68px) + 10px);
    z-index: 1100;
    width: min(calc(100vw - 40px), 1120px);
    transform: translateX(-50%);
  }
}

@media (max-width: 980px) {
  .nav-burger {
    display: inline-flex;
  }

  .site-header__overlay {
    display: block;
    position: fixed;
    inset: var(--nav-h) 0 0;
    background: rgba(15, 23, 42, 0.35);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }

  .site-header.is-open .site-header__overlay {
    opacity: 1;
    pointer-events: auto;
  }

  .site-header__panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin-left: 0;
    max-height: min(78vh, 640px);
    overflow: auto;
    padding: 12px 16px 20px;
    background: #fff;
    border-bottom: 1px solid var(--nav-line);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
  }

  .site-header.is-open .site-header__panel {
    display: flex;
  }

  .site-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link,
  .site-nav__trigger {
    width: 100%;
    justify-content: space-between;
    padding: 12px 10px;
    border-radius: 10px;
  }

  .site-nav__link::after,
  .site-nav__trigger::after {
    display: none;
  }

  .site-nav__link.is-active,
  .courses-nav.is-open > .site-nav__trigger {
    background: #f3f8fd;
  }

  .site-cta {
    margin: 10px 0 0;
    width: 100%;
  }

  .courses-mega {
    position: static;
    width: 100%;
    margin-top: 4px;
  }

  .courses-mega-bridge {
    display: none;
  }

  .courses-mega__panel {
    border-radius: 12px;
    box-shadow: none;
  }

  .courses-mega__categories,
  .courses-mega__cards {
    grid-template-columns: 1fr;
  }

  .courses-mega__categories,
  .courses-mega__top {
    padding: 16px;
  }
}

body.nav-lock {
  overflow: hidden;
}