:root {
  --navbar-height: 80px;
  --bg-primary: #f8f9fa;
  --bg-secondary: #e9ecef;
  --bg-tertiary: #dee2e6;
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-muted: #6c757d;
  --accent-color: #7952b3;
  --accent-hover: #61428f;
  --border-color: #dee2e6;
  --shadow-color: rgba(33, 37, 41, 0.1);
  --navbar-bg: var(--accent-color);
  --card-bg: #ffffff;
  --success-color: #198754;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
}

[data-bs-theme="dark"] {
  --bg-primary: #212529;
  --bg-secondary: #343a40;
  --bg-tertiary: #495057;
  --text-primary: #ffffff;
  --text-secondary: #dee2e6;
  --text-muted: #adb5bd;
  --border-color: #495057;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --navbar-bg: rgba(33, 37, 41, 0.95);
  --card-bg: #343a40;
  --accent-color: #6ea8fe;
  --accent-hover: #5a94e8;
}

[data-bs-theme="high-contrast"] {
  --bg-primary: #000000;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #333333;
  --text-primary: #ffffff;
  --text-secondary: #ffffff;
  --text-muted: #ffffff;
  --border-color: #ffffff;
  --shadow-color: rgba(255, 255, 255, 0.3);
  --navbar-bg: #000000;
  --card-bg: #1a1a1a;
  --accent-color: #00ff00;
  --accent-hover: #00cc00;
}

* { transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease; }

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

#wrap { flex-grow: 1; }

.navbar {
  background-color: var(--navbar-bg) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px var(--shadow-color);
}

.navbar-brand { color: var(--text-primary) !important; font-weight: 700; font-size: 1.5rem; }
.navbar-nav .nav-link { color: var(--text-primary) !important; font-weight: 500; margin: 0 0.5rem; padding: 0.5rem 1rem !important; border-radius: 0.375rem; transition: all 0.3s ease; }

body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .navbar-brand,
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .navbar-nav .nav-link { color: #ffffff !important; }

.navbar-nav .nav-link:hover { color: var(--accent-color) !important; background-color: var(--bg-secondary); }
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .navbar-nav .nav-link:hover { color: #ffffff !important; background-color: rgba(255, 255, 255, 0.1); }

.navbar-toggler { border: none; color: var(--text-primary); }
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .navbar-toggler { color: #ffffff !important; }
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .navbar-toggler-icon { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"); }
.navbar-toggler:focus { box-shadow: none; }

.theme-switcher-container .btn { border: none; }
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .theme-switcher-container .btn { color: #ffffff !important; }
.theme-switcher-container .theme-dropdown-btn { min-width: auto; width: 44px; height: 44px; padding: 0; display: flex; justify-content: center; align-items: center; }
.theme-switcher-container .theme-dropdown-btn i { font-size: 1.5rem; }
.theme-switcher-container .theme-dropdown-btn::after { display: none; }
.theme-switcher-container .btn:hover { background-color: var(--bg-secondary); border-color: var(--accent-color); }
body:not([data-bs-theme="dark"]):not([data-bs-theme="high-contrast"]) .theme-switcher-container .btn:hover { background-color: rgba(255, 255, 255, 0.1); }

.dropdown-menu { background-color: var(--card-bg); border-color: var(--border-color); box-shadow: 0 0.5rem 1rem var(--shadow-color); }
.dropdown-item { color: var(--text-primary); }
.dropdown-item:hover { background-color: var(--bg-secondary); color: var(--accent-color); }

section { padding: 5rem 0; scroll-margin-top: var(--navbar-height); }
.bg-light-theme { background-color: var(--bg-secondary) !important; }

.card { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: 15px; box-shadow: 0 5px 15px var(--shadow-color); transition: transform 0.3s ease, box-shadow 0.3s ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 15px 35px var(--shadow-color); }
.card-header { font-weight: 600; }



#scrollToTopBtn {
  position: fixed; bottom: 20px; right: 20px; z-index: 1000;
  border: none; outline: none; background-color: var(--accent-color); color: white; cursor: pointer;
  width: 54px; height: 54px; border-radius: 10px;
  box-shadow: 0 4px 8px var(--shadow-color);
  transition: background-color 0.3s ease, transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(20px);
}
#scrollToTopBtn.show { opacity: 1; visibility: visible; transform: translateY(0); }
#scrollToTopBtn i { font-size: 1.5rem; line-height: 1; }
#scrollToTopBtn:hover { background-color: var(--accent-hover); transform: translateY(-2px); }

html { scroll-behavior: smooth; scroll-padding-top: var(--navbar-height); }

body { padding-top: var(--navbar-height); }

.main-content-padding { padding-top: calc(var(--navbar-height) + 2rem); }

.btn:focus, .form-control:focus, .nav-link:focus { outline: 2px solid var(--accent-color); outline-offset: 2px; }

[data-bs-theme="high-contrast"] .card { border: 2px solid var(--border-color); }
[data-bs-theme="high-contrast"] .navbar-nav .nav-link:hover { background-color: var(--accent-color); color: var(--bg-primary) !important; }
[data-bs-theme="high-contrast"] .navbar-toggler-icon { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"); }
[data-bs-theme="high-contrast"] .btn:focus, [data-bs-theme="high-contrast"] .nav-link:focus { outline: 3px solid var(--accent-color); outline-offset: 3px; }

[data-bs-theme="dark"] .text-primary,
[data-bs-theme="high-contrast"] .text-primary { color: var(--accent-color) !important; }

[data-bs-theme="dark"] .card-body,
[data-bs-theme="high-contrast"] .card-body { color: var(--text-primary); }

[data-bs-theme="dark"] .btn-outline-primary { color: var(--accent-color); border-color: var(--accent-color); }
[data-bs-theme="dark"] .btn-outline-primary:hover { background-color: var(--accent-color); color: var(--bg-primary); border-color: var(--accent-color); }
[data-bs-theme="high-contrast"] .btn-outline-primary { color: var(--accent-color); border-color: var(--accent-color); }
[data-bs-theme="high-contrast"] .btn-outline-primary:hover { background-color: var(--accent-color); color: var(--bg-primary); border-color: var(--accent-color); }

[data-bs-theme="dark"] .bg-warning.text-dark { color: #212529 !important; }
[data-bs-theme="high-contrast"] .bg-warning.text-dark { color: #212529 !important; }

[data-bs-theme="dark"] #scrollToTopBtn,
[data-bs-theme="high-contrast"] #scrollToTopBtn { color: var(--bg-primary); background-color: var(--accent-color); }
[data-bs-theme="dark"] #scrollToTopBtn:hover,
[data-bs-theme="high-contrast"] #scrollToTopBtn:hover { background-color: var(--accent-hover); }

footer { background-color: var(--bg-tertiary) !important; border-top: 1px solid var(--border-color); }
[data-bs-theme="dark"] footer,
[data-bs-theme="high-contrast"] footer { background-color: var(--bg-tertiary) !important; }
footer p { color: var(--text-secondary); margin-bottom: 0; }
footer a { color: var(--text-secondary); font-size: 1.2rem; transition: color 0.3s ease; }
footer a:hover { color: var(--accent-color); }

hr { border-color: var(--border-color); }
[data-bs-theme="dark"] hr,
[data-bs-theme="high-contrast"] hr { border-color: var(--border-color); opacity: 1; }

pre { position: relative; }
.copy-code-btn {
  position: absolute; top: 0.75rem; right: 0.75rem; z-index: 10;
  display: inline-block; padding: 0.375rem 0.75rem; font-size: 0.875rem; font-weight: 600;
  color: var(--text-secondary); background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color); border-radius: 0.375rem; cursor: pointer;
  transition: all 0.2s ease-in-out; opacity: 0;
}
pre:hover .copy-code-btn { opacity: 1; }
.copy-code-btn:hover { color: var(--text-primary); background-color: var(--bg-secondary); border-color: var(--accent-color); }
.copy-code-btn.copied { background-color: var(--success-color); color: #fff; border-color: var(--success-color); opacity: 1; }

@media (max-width: 991.98px) {
  .navbar-collapse { padding-top: 1rem; max-height: 80vh; overflow-y: auto; }
  .theme-switcher-container { padding: 0.5rem 1rem; }
}

@media (max-width: 768px) {
  .theme-switcher-container { margin-bottom: 1rem; }
}