:root {
  --tr-navbar-height: 68px;
  --tr-navbar-bg-light: rgba(255, 255, 255, 0.94);
  --tr-navbar-bg-dark: rgba(9, 14, 24, 0.94);
  --tr-navbar-text-light: #0f172a;
  --tr-navbar-text-dark: #f1f5f9;
  --tr-navbar-accent: #1d4ed8;
  --tr-navbar-hover-light: #eef2ff;
  --tr-navbar-hover-dark: rgba(59, 130, 246, 0.18);
  --tr-navbar-border-light: rgba(2, 6, 23, 0.08);
  --tr-navbar-border-dark: rgba(148, 163, 184, 0.22);
  --tr-navbar-shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
  --tr-navbar-search-bg-light: rgba(255, 255, 255, 0.96);
  --tr-navbar-search-bg-dark: rgba(15, 23, 42, 0.88);
  --tr-navbar-search-border-light: rgba(15, 23, 42, 0.12);
  --tr-navbar-search-border-dark: rgba(148, 163, 184, 0.3);
  --tr-navbar-search-text-light: #0f172a;
  --tr-navbar-search-text-dark: #f8fafc;
  --tr-navbar-z: 1000;
  --tr-transition: all 0.2s ease;
}

.tr-navbar {
  position: sticky;
  top: 0;
  z-index: var(--tr-navbar-z);
  width: 100%;
  background: var(--tr-navbar-bg-light);
  color: var(--tr-navbar-text-light);
  border-bottom: 1px solid var(--tr-navbar-border-light);
  box-shadow: var(--tr-navbar-shadow);
  backdrop-filter: blur(8px);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.tr-navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: var(--tr-navbar-height);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}

.tr-navbar__logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.tr-navbar__brand {
  color: var(--tr-navbar-accent);
  font-size: clamp(1.35rem, 1.1rem + 1.1vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.tr-navbar__nav {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.tr-navbar__link {
  position: relative;
  color: inherit;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 0;
  border-radius: 8px;
}

.tr-navbar__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -12px;
  height: 2px;
  border-radius: 999px;
  background: transparent;
  transition: var(--tr-transition);
}

.tr-navbar__link:hover,
.tr-navbar__link:focus-visible,
.tr-navbar__link.active,
.tr-navbar__link--pricing {
  color: var(--tr-navbar-accent);
}

.tr-navbar__link:hover::after,
.tr-navbar__link:focus-visible::after,
.tr-navbar__link.active::after {
  background: var(--tr-navbar-accent);
}

.tr-navbar__user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.tr-navbar__user-avatar,
.tr-navbar__mobile-user-avatar {
  position: relative;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 2px solid rgba(29, 78, 216, 0.35);
  overflow: hidden;
  background: #dbeafe;
}

.tr-navbar__avatar-img,
.tr-navbar__mobile-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tr-navbar__premium-star,
.tr-navbar__mobile-premium-star {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #facc15;
  border: 1px solid #ffffff;
  color: #1f2937;
  font-size: 11px;
  font-weight: 700;
}

.tr-navbar__user-name {
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.92rem;
  font-weight: 650;
  color: inherit;
}

.tr-navbar__mobile-user-name {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 650;
  color: inherit;
}

.tr-navbar__auth-btn,
.tr-navbar__logout-btn,
.tr-navbar__mobile-auth-btn,
.tr-navbar__mobile-logout-btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--tr-transition);
}

.tr-navbar__auth-btn,
.tr-navbar__mobile-auth-btn {
  background: var(--tr-navbar-accent);
  color: #ffffff;
}

.tr-navbar__auth-btn:hover,
.tr-navbar__auth-btn:focus-visible,
.tr-navbar__mobile-auth-btn:hover,
.tr-navbar__mobile-auth-btn:focus-visible {
  background: #1e40af;
}

.tr-navbar__logout-btn {
  background: #ffffff;
  color: #b42318;
  border-color: rgba(180, 35, 24, 0.3);
}

.tr-navbar__logout-btn:hover,
.tr-navbar__logout-btn:focus-visible {
  background: rgba(180, 35, 24, 0.08);
}

.tr-navbar__theme-btn,
.tr-navbar__mobile-theme-btn {
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  min-height: 44px;
}

.tr-navbar__theme-btn {
  width: 44px;
  padding: 0;
}

.tr-navbar__theme-btn:hover,
.tr-navbar__theme-btn:focus-visible,
.tr-navbar__mobile-theme-btn:hover,
.tr-navbar__mobile-theme-btn:focus-visible {
  background: var(--tr-navbar-hover-light);
}

.tr-navbar__theme-btn .tr-navbar__icon-moon,
.tr-navbar__mobile-theme-btn .tr-navbar__icon-moon {
  display: none;
}

body.dark .tr-navbar__theme-btn .tr-navbar__icon-sun,
body.tr-dark .tr-navbar__theme-btn .tr-navbar__icon-sun,
body.dark .tr-navbar__mobile-theme-btn .tr-navbar__icon-sun,
body.tr-dark .tr-navbar__mobile-theme-btn .tr-navbar__icon-sun {
  display: none;
}

body.dark .tr-navbar__theme-btn .tr-navbar__icon-moon,
body.tr-dark .tr-navbar__theme-btn .tr-navbar__icon-moon,
body.dark .tr-navbar__mobile-theme-btn .tr-navbar__icon-moon,
body.tr-dark .tr-navbar__mobile-theme-btn .tr-navbar__icon-moon {
  display: inline;
}

.tr-navbar__theme-label {
  font-size: 0.9rem;
  font-weight: 600;
}

.tr-navbar__search-toggle {
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  padding: 0;
  margin-left: 8px;
}

.tr-navbar__search-toggle:hover,
.tr-navbar__search-toggle:focus-visible {
  background: var(--tr-navbar-hover-light);
}

.tr-navbar__search-toggle-icon,
.tr-navbar__search-field-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  line-height: 1;
  flex: 0 0 auto;
}

.tr-navbar__search-toggle-icon .tr-navbar__search-icon-svg {
  width: 22px;
  height: 22px;
  stroke-width: 2.3;
}

.tr-navbar__search-field-icon .tr-navbar__search-icon-svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
  opacity: 0.92;
}

.tr-navbar__search-inline {
  display: none !important;
}

.tr-navbar--search-open .tr-navbar__search-inline {
  display: none !important;
}

.tr-navbar__search-field {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--tr-navbar-search-border-light);
  background: var(--tr-navbar-search-bg-light);
  color: var(--tr-navbar-search-text-light);
  padding: 0 12px;
}

.tr-navbar__search-input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: inherit;
  font-size: 0.92rem;
  font-weight: 500;
}

.tr-navbar__search-input::placeholder {
  color: rgba(71, 85, 105, 0.75);
}

.tr-navbar__search-mobile-row {
  display: block;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.2s ease, border-color 0.2s ease;
  opacity: 0;
  border-top: 1px solid transparent;
}

.tr-navbar__search-mobile-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tr-navbar--search-open .tr-navbar__search-mobile-row {
  max-height: 380px;
  opacity: 1;
  border-top-color: var(--tr-navbar-border-light);
}

.tr-search-suggestions {
  margin-top: 2px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.1);
  overflow: hidden;
  max-height: 220px;
  overflow-y: auto;
}

.tr-search-suggestion {
  width: 100%;
  text-align: left;
  border: 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.22);
  background: transparent;
  color: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 10px 12px;
  cursor: pointer;
}

.tr-search-suggestion:last-child {
  border-bottom: 0;
}

.tr-search-suggestion:hover,
.tr-search-suggestion:focus-visible {
  background: rgba(219, 234, 254, 0.7);
}

.tr-search-empty {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px dashed rgba(148, 163, 184, 0.5);
  color: #475569;
  background: rgba(248, 250, 252, 0.75);
  font-size: 0.92rem;
  font-weight: 600;
  text-align: center;
}

.tr-syllabus-search-wrap {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tr-syllabus-search-label {
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: #334155;
}

.tr-syllabus-search-field {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  min-height: 46px;
  padding: 0 12px;
}

.tr-syllabus-search-input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  font-size: 0.95rem;
  color: inherit;
}

.tr-syllabus-search-input::placeholder {
  color: rgba(71, 85, 105, 0.72);
}

.tr-syllabus-search-empty {
  margin: 4px 0 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #64748b;
}

.page-syllabus .syllabus-item h3 mark,
.page-syllabus .syllabus-item .syllabus-description mark {
  padding: 0 2px;
  border-radius: 4px;
  background: rgba(250, 204, 21, 0.35);
  color: inherit;
}

.tr-navbar__hamburger {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.tr-navbar__hamburger:hover,
.tr-navbar__hamburger:focus-visible {
  background: var(--tr-navbar-hover-light);
}

.tr-navbar__hamburger-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: var(--tr-transition);
}

.tr-navbar__hamburger[aria-expanded="true"] .tr-navbar__hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.tr-navbar__hamburger[aria-expanded="true"] .tr-navbar__hamburger-line:nth-child(2) {
  opacity: 0;
}

.tr-navbar__hamburger[aria-expanded="true"] .tr-navbar__hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.tr-navbar__mobile-menu {
  display: none;
  border-top: 1px solid var(--tr-navbar-border-light);
  background: var(--tr-navbar-bg-light);
}

.tr-navbar__mobile-nav {
  list-style: none;
  margin: 0;
  padding: 12px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}


.tr-navbar__mobile-link,
.tr-navbar__mobile-theme-btn,
.tr-navbar__mobile-logout-btn,
.tr-navbar__mobile-auth-btn {
  width: 100%;
  text-align: left;
  text-decoration: none;
  color: inherit;
  border-radius: 10px;
  padding: 10px 12px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
}

.tr-navbar__mobile-link:hover,
.tr-navbar__mobile-link:focus-visible,
.tr-navbar__mobile-theme-btn:hover,
.tr-navbar__mobile-theme-btn:focus-visible,
.tr-navbar__mobile-logout-btn:hover,
.tr-navbar__mobile-logout-btn:focus-visible {
  background: var(--tr-navbar-hover-light);
}

.tr-navbar__mobile-link.active {
  color: var(--tr-navbar-accent);
  background: rgba(29, 78, 216, 0.1);
  border-color: rgba(29, 78, 216, 0.25);
}

.tr-navbar__mobile-link--pricing {
  color: var(--tr-navbar-accent);
}

.tr-navbar__mobile-user-info {
  margin: 6px 0;
  border: 1px solid var(--tr-navbar-border-light);
  border-radius: 12px;
  padding: 10px 12px;
  gap: 10px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.tr-navbar__mobile-user-name {
  flex: 1;
}

.tr-navbar__mobile-logout-btn {
  color: #b42318;
}

body.tr-menu-open {
  overflow: hidden;
}

body.tr-menu-open .tr-navbar {
  z-index: 2147483000;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

@media (max-width: 899px) {
  .tr-navbar__nav,
  .tr-navbar__theme-btn,
  .tr-navbar__auth-btn,
  .tr-navbar__user-info,
  .tr-navbar__logout-btn {
    display: none !important;
  }

  .tr-navbar__hamburger {
    display: inline-flex;
    margin-left: auto;
  }

  .tr-navbar__container {
    padding: 0 14px;
    min-height: var(--tr-navbar-height);
  }

  .tr-navbar__brand {
    font-size: 1.45rem;
  }

  .tr-navbar__search-inline {
    display: none;
  }

  .tr-navbar__search-toggle {
    display: inline-flex;
    margin-left: 8px;
  }

  .tr-navbar__mobile-menu {
    display: flex;
    justify-content: flex-end;
    position: fixed;
    top: var(--tr-navbar-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2147483001;
    border-top: 0;
    background: rgba(2, 6, 23, 0.64);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }

  .tr-navbar__mobile-menu.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .tr-navbar__mobile-nav {
    width: min(80vw, 360px);
    height: 100%;
    margin: 0 0 0 auto;
    padding: 12px 12px 16px;
    gap: 8px;
    background: #ffffff;
    border-left: 1px solid rgba(15, 23, 42, 0.18);
    box-shadow:
      -26px 0 48px rgba(15, 23, 42, 0.28),
      0 0 0 1px rgba(15, 23, 42, 0.05) inset;
    border-top-left-radius: 14px;
    border-bottom-left-radius: 14px;
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    will-change: transform;
    position: relative;
    z-index: 2147483002;
  }

  .tr-navbar__mobile-menu.open .tr-navbar__mobile-nav {
    transform: translateX(0);
  }

  .tr-navbar__mobile-link,
  .tr-navbar__mobile-theme-btn,
  .tr-navbar__mobile-logout-btn,
  .tr-navbar__mobile-auth-btn {
    min-height: 46px;
    padding: 11px 12px;
    font-size: 0.95rem;
  }
}

@media (min-width: 900px) {
  .tr-navbar__mobile-menu,
  .tr-navbar__mobile-auth-btn,
  .tr-navbar__mobile-theme-btn,
  .tr-navbar__mobile-user-info,
  .tr-navbar__mobile-logout-btn,
  .tr-navbar__hamburger {
    display: none !important;
  }

  .tr-navbar__nav {
    position: static;
    transform: none;
    margin-left: clamp(14px, 2vw, 26px);
    margin-right: auto;
    gap: 18px;
  }

  .tr-navbar__logo,
  .tr-navbar__user-info,
  .tr-navbar__auth-btn,
  .tr-navbar__theme-btn {
    z-index: 1;
  }

  .tr-navbar__user-info {
    flex-shrink: 0;
  }
}

body.dark .tr-navbar,
body.tr-dark .tr-navbar {
  background: var(--tr-navbar-bg-dark);
  color: var(--tr-navbar-text-dark);
  border-bottom-color: var(--tr-navbar-border-dark);
}

body.dark .tr-navbar__mobile-menu,
body.tr-dark .tr-navbar__mobile-menu {
  background: rgba(2, 6, 23, 0.76);
  border-top-color: transparent;
}

body.dark .tr-navbar__mobile-nav,
body.tr-dark .tr-navbar__mobile-nav {
  background: #0b1220;
  border-left-color: var(--tr-navbar-border-dark);
  box-shadow:
    -26px 0 50px rgba(2, 6, 23, 0.72),
    0 0 0 1px rgba(148, 163, 184, 0.08) inset;
}

body.dark .tr-navbar__link:hover,
body.dark .tr-navbar__link:focus-visible,
body.dark .tr-navbar__mobile-link:hover,
body.dark .tr-navbar__mobile-link:focus-visible,
body.tr-dark .tr-navbar__link:hover,
body.tr-dark .tr-navbar__link:focus-visible,
body.tr-dark .tr-navbar__mobile-link:hover,
body.tr-dark .tr-navbar__mobile-link:focus-visible {
  color: #93c5fd;
}

body.dark .tr-navbar__theme-btn:hover,
body.dark .tr-navbar__theme-btn:focus-visible,
body.dark .tr-navbar__mobile-theme-btn:hover,
body.dark .tr-navbar__mobile-theme-btn:focus-visible,
body.dark .tr-navbar__hamburger:hover,
body.dark .tr-navbar__hamburger:focus-visible,
body.tr-dark .tr-navbar__theme-btn:hover,
body.tr-dark .tr-navbar__theme-btn:focus-visible,
body.tr-dark .tr-navbar__mobile-theme-btn:hover,
body.tr-dark .tr-navbar__mobile-theme-btn:focus-visible,
body.tr-dark .tr-navbar__hamburger:hover,
body.tr-dark .tr-navbar__hamburger:focus-visible {
  background: var(--tr-navbar-hover-dark);
}

body.dark .tr-navbar__mobile-user-info,
body.tr-dark .tr-navbar__mobile-user-info {
  border-color: var(--tr-navbar-border-dark);
}

body.dark .tr-navbar__search-toggle:hover,
body.dark .tr-navbar__search-toggle:focus-visible,
body.tr-dark .tr-navbar__search-toggle:hover,
body.tr-dark .tr-navbar__search-toggle:focus-visible {
  background: var(--tr-navbar-hover-dark);
}

body.dark .tr-navbar__search-field,
body.dark .tr-syllabus-search-field,
body.tr-dark .tr-navbar__search-field,
body.tr-dark .tr-syllabus-search-field {
  background: var(--tr-navbar-search-bg-dark);
  border-color: var(--tr-navbar-search-border-dark);
  color: var(--tr-navbar-search-text-dark);
}

body.dark .tr-navbar__search-input::placeholder,
body.dark .tr-syllabus-search-input::placeholder,
body.tr-dark .tr-navbar__search-input::placeholder,
body.tr-dark .tr-syllabus-search-input::placeholder {
  color: rgba(203, 213, 225, 0.72);
}

body.dark .tr-search-suggestions,
body.tr-dark .tr-search-suggestions {
  background: rgba(15, 23, 42, 0.95);
  border-color: rgba(148, 163, 184, 0.3);
  box-shadow: 0 12px 30px rgba(2, 6, 23, 0.45);
}

body.dark .tr-search-suggestion,
body.tr-dark .tr-search-suggestion {
  border-bottom-color: rgba(148, 163, 184, 0.22);
  color: #f8fafc;
}

body.dark .tr-search-suggestion:hover,
body.dark .tr-search-suggestion:focus-visible,
body.tr-dark .tr-search-suggestion:hover,
body.tr-dark .tr-search-suggestion:focus-visible {
  background: rgba(59, 130, 246, 0.22);
}

body.dark .tr-navbar--search-open .tr-navbar__search-mobile-row,
body.tr-dark .tr-navbar--search-open .tr-navbar__search-mobile-row {
  border-top-color: var(--tr-navbar-border-dark);
}

body.dark .tr-search-empty,
body.tr-dark .tr-search-empty {
  border-color: rgba(148, 163, 184, 0.35);
  color: #cbd5e1;
  background: rgba(15, 23, 42, 0.55);
}

body.dark .tr-syllabus-search-label,
body.dark .tr-syllabus-search-empty,
body.tr-dark .tr-syllabus-search-label,
body.tr-dark .tr-syllabus-search-empty {
  color: #cbd5e1;
}

body.dark .page-syllabus .syllabus-item h3 mark,
body.dark .page-syllabus .syllabus-item .syllabus-description mark,
body.tr-dark .page-syllabus .syllabus-item h3 mark,
body.tr-dark .page-syllabus .syllabus-item .syllabus-description mark {
  background: rgba(250, 204, 21, 0.28);
  color: #f8fafc;
}

body.dark .tr-navbar__logout-btn,
body.tr-dark .tr-navbar__logout-btn {
  background: rgba(180, 35, 24, 0.08);
  border-color: rgba(248, 113, 113, 0.25);
  color: #fecaca;
}