/* Core Variable System - Clean Light Theme */
:root {
    /* Backgrounds */
    --bg-main: #f5f5f7;           /* Apple-style soft white-gray */
    --bg-card: #ffffff;
    --bg-darker: #ebebed;

    /* Brand */
    --color-primary: #185adb;
    --color-primary-hover: #11419f;
    --color-secondary: #0b1d3a;
    --color-accent: #0ea5e9;

    /* Text — true dark for max contrast */
    --text-main: #111111;
    --text-muted: #6b7280;

    /* Borders */
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(24, 90, 219, 0.28);

    /* Glass & glow */
    --glass-bg: rgba(255, 255, 255, 0.88);
    --purple-glow: rgba(24, 90, 219, 0.08);

    /* Transitions */
    --theme-transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

/* True-black dark theme — matches reference screenshots */
[data-theme="dark"] {
    /* Backgrounds: pure black gamut, no navy tint */
    --bg-main: #0a0a0a;
    --bg-card: #141414;
    --bg-darker: #1c1c1e;         /* subtle card hierarchy */

    /* Brand — kept blue accent but brighter for dark bg */
    --color-primary: #4f9cf9;
    --color-primary-hover: #3b82f6;
    --color-secondary: #f5f5f7;
    --color-accent: #38bdf8;

    /* Text — clean white, not blue-tinted */
    --text-main: #f5f5f7;
    --text-muted: #8d8d92;

    /* Borders — subtle white lines */
    --border-color: rgba(255, 255, 255, 0.09);
    --border-hover: rgba(79, 156, 249, 0.4);

    /* Glass */
    --glass-bg: rgba(20, 20, 20, 0.82);
    --purple-glow: rgba(79, 156, 249, 0.14);
}

/* Global Styles */
body {
    background-color: var(--bg-main) !important;
    color: var(--text-main) !important;
    font-family: 'Inter', sans-serif;
    letter-spacing: -0.01em;
    transition: var(--theme-transition);
}

/* Hide default Bootstrap dropdown caret arrow */
.dropdown-toggle::after {
    display: none !important;
}

h1, h2, h3, h4, h5, h6, .font-heading {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    color: var(--text-main);
}

/* Gradients and Badges */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.bg-purple-glow {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    box-shadow: 0 5px 15px var(--purple-glow);
}

/* Glassmorphism Navbar */
.glass-nav {
    background: var(--glass-bg) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color) !important;
    padding: 12px 0;
    transition: var(--theme-transition);
}

.glass-nav .nav-link {
    color: var(--text-main) !important;
    font-weight: 500;
    transition: var(--theme-transition);
}

.glass-nav .nav-link:hover {
    color: var(--color-primary) !important;
}

.glass-nav .nav-link.active {
    color: var(--color-primary) !important;
}

.glass-nav .navbar-brand {
    color: var(--text-main) !important;
    transition: var(--theme-transition);
}

/* AI Muallim animated dot in navbar */
.ai-nav-dot {
    display: inline-block;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: #4ade80;
    flex-shrink: 0;
    animation: pulseDotGreen 1.5s ease-in-out infinite;
}
@keyframes pulseDotGreen {
    0%,100% { box-shadow: 0 0 0 0 rgba(74,222,128,.5); }
    50%      { box-shadow: 0 0 0 5px rgba(74,222,128,0); }
}

/* Cards & Containers */
.glass-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(11, 29, 58, 0.04);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    box-shadow: 0 15px 35px var(--purple-glow);
}

.bg-darker {
    background-color: var(--bg-darker) !important;
    transition: var(--theme-transition);
}

/* Custom Buttons */
.btn-purple {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: var(--btn-text) !important;
    border: none;
    border-radius: 10px;
    padding: 10px 22px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-purple:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--purple-glow);
    opacity: 0.9;
}

.btn-outline-purple {
    border: 2px solid var(--color-primary);
    color: var(--color-primary) !important;
    border-radius: 10px;
    padding: 8px 20px;
    background: transparent;
    transition: all 0.2s ease;
}

.btn-outline-purple:hover {
    background-color: var(--color-primary);
    color: var(--btn-text) !important;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--purple-glow);
}

/* AI Assistant & Chat Window */
.chat-container {
    height: 400px;
    overflow-y: auto;
    padding: 15px;
    border-radius: 12px;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
}

.chat-message {
    margin-bottom: 12px;
    padding: 12px 16px;
    border-radius: 14px;
    max-width: 85%;
    font-size: 14px;
    line-height: 1.5;
}

.chat-message.user {
    background-color: var(--color-primary);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 2px;
}

.chat-message.bot {
    background-color: var(--bg-card);
    color: var(--text-main);
    margin-right: auto;
    border-bottom-left-radius: 2px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

/* Animations */
@keyframes pulseGlow {
    0% { box-shadow: 0 0 5px rgba(24, 90, 219, 0.1); }
    50% { box-shadow: 0 0 20px rgba(24, 90, 219, 0.3); }
    100% { box-shadow: 0 0 5px rgba(24, 90, 219, 0.1); }
}

.glowing-element {
    animation: pulseGlow 2s infinite ease-in-out;
}

/* Custom form fields styled for light theme */
.form-control, .form-select {
    background-color: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-main) !important;
    border-radius: 10px !important;
    padding: 12px !important;
}

.form-control:focus, .form-select:focus {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px rgba(24, 90, 219, 0.15) !important;
}

/* Quiz UI Components */
.quiz-option {
    cursor: pointer;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    color: var(--text-main);
}

.quiz-option:hover {
    border-color: var(--color-primary);
    background-color: rgba(24, 90, 219, 0.03);
}

.quiz-option input[type="radio"] {
    margin-right: 12px;
    accent-color: var(--color-primary);
}

.quiz-option.selected {
    border-color: var(--color-primary);
    background-color: rgba(24, 90, 219, 0.08);
}

/* Typography styles for translation dropdown */
.dropdown-menu-dark .dropdown-item:hover {
    background-color: var(--color-primary);
}

.dropdown-menu-dark {
    background-color: var(--color-secondary) !important;
    border-color: var(--border-color) !important;
}

/* Shimmer Loading Animation for Async AI feedback */
.shimmer-loader {
    background: linear-gradient(90deg, #e2e8f0 25%, #cbd5e1 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
    height: 18px;
    margin-bottom: 8px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Dark-mode text replacement rules for tables & cards */
.text-muted {
    color: var(--text-muted) !important;
}

.text-white {
    color: var(--text-main) !important;
}

.text-light {
    color: var(--text-main) !important;
}

.alert-dismissible .btn-close-white {
    filter: invert(1);
}

.table-dark {
    --bs-table-bg: var(--bg-card) !important;
    --bs-table-color: var(--text-main) !important;
    --bs-table-border-color: var(--border-color) !important;
}

/* Scrolled Navbar */
.glass-nav.scrolled {
    box-shadow: 0 4px 20px rgba(11, 29, 58, 0.05) !important;
    background: var(--glass-bg) !important;
    border-bottom: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .glass-nav.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25) !important;
}

/* ═══════════════════════════════════════════
   GLOBAL THEME-AWARE BOOTSTRAP OVERRIDES
   Dark & Light mode uchun universal tuzatishlar
═══════════════════════════════════════════ */

/* Table — dark/light both */
.table,
.table-dark {
    --bs-table-bg:           var(--bg-card) !important;
    --bs-table-striped-bg:   var(--bg-darker) !important;
    --bs-table-hover-bg:     color-mix(in srgb, var(--color-primary) 6%, var(--bg-card)) !important;
    --bs-table-color:        var(--text-main) !important;
    --bs-table-border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}
.table thead th {
    color: var(--text-muted) !important;
    font-size: .8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    border-bottom-color: var(--border-color) !important;
}
.table td, .table th {
    border-color: var(--border-color) !important;
    vertical-align: middle;
}
.table-responsive { border-radius: 12px; overflow: hidden; }

/* btn-outline-light → theme-aware secondary */
.btn-outline-light {
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
    background: var(--bg-card) !important;
}
.btn-outline-light:hover {
    background: var(--bg-darker) !important;
    border-color: var(--color-primary) !important;
    color: var(--color-primary) !important;
}

/* btn-outline-secondary → theme-aware */
.btn-outline-secondary {
    border-color: var(--border-color) !important;
    color: var(--text-muted) !important;
}
.btn-outline-secondary:hover {
    background: var(--bg-darker) !important;
    color: var(--text-main) !important;
}

/* Badge */
.badge.bg-dark {
    background-color: var(--bg-darker) !important;
    color: var(--text-muted) !important;
    border: 1px solid var(--border-color) !important;
}
.border-purple { border-color: var(--color-primary) !important; }

/* Alerts — theme-aware */
.alert {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}
.alert-success {
    background-color: rgba(16, 185, 129, .12) !important;
    border-color: rgba(16, 185, 129, .25) !important;
    color: #065f46 !important;
}
[data-theme="dark"] .alert-success {
    color: #6ee7b7 !important;
}
.alert-danger {
    background-color: rgba(239, 68, 68, .1) !important;
    border-color: rgba(239, 68, 68, .2) !important;
    color: #991b1b !important;
}
[data-theme="dark"] .alert-danger { color: #fca5a5 !important; }
.alert-info {
    background-color: rgba(14, 165, 233, .1) !important;
    border-color: rgba(14, 165, 233, .2) !important;
    color: var(--color-primary) !important;
}

/* Borders */
.border-secondary {
    border-color: var(--border-color) !important;
}

/* List group */
.list-group-item {
    background-color: transparent !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

/* Category filter buttons */
.btn-filter {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 999px;
    padding: .4rem 1.1rem;
    font-size: .85rem;
    font-weight: 500;
    transition: all .18s ease;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.btn-filter:hover,
.btn-filter.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* Lesson content area */
.lesson-content {
    color: var(--text-main) !important;
    font-size: 1.05rem;
    line-height: 1.8;
}
.lesson-content p  { color: var(--text-main); margin-bottom: 1rem; }
.lesson-content h2, .lesson-content h3, .lesson-content h4 {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    color: var(--text-main);
    margin-top: 2rem;
    margin-bottom: .75rem;
}
.lesson-content strong { color: var(--text-main); }
.lesson-content code {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: .15rem .45rem;
    font-size: .88em;
    color: var(--color-primary);
}
.lesson-content pre {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    overflow-x: auto;
    color: var(--text-main);
}

/* Course thumbnail placeholder gradient */
.course-thumb-placeholder {
    background: linear-gradient(135deg,
        color-mix(in srgb, var(--color-primary) 12%, var(--bg-darker)) 0%,
        color-mix(in srgb, var(--color-accent) 12%, var(--bg-darker)) 100%);
}

/* Form labels & inputs — theme-aware */
label, .form-label { color: var(--text-main) !important; font-weight: 500; }
.form-text { color: var(--text-muted) !important; }
.invalid-feedback { font-size: .8rem; }

/* Input group addon */
.input-group-text {
    background: var(--bg-darker) !important;
    border-color: var(--border-color) !important;
    color: var(--text-muted) !important;
}

/* Footer */
footer {
    background-color: var(--bg-darker) !important;
    border-top-color: var(--border-color) !important;
}

/* Spinner for AI */
.spinner-grow.text-purple {
    color: var(--color-primary) !important;
}

/* Quiz options */
.quiz-option {
    color: var(--text-main) !important;
}

/* Scrollbar global */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* Selection */
::selection {
    background: color-mix(in srgb, var(--color-primary) 25%, transparent);
    color: var(--text-main);
}

/* ── FORM CONTROLS ── */
.form-control,
.form-select {
    background-color: var(--bg-darker) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
    border-radius: 10px;
    padding: .65rem 1rem;
    transition: border-color .2s ease, box-shadow .2s ease;
}
.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 15%, transparent) !important;
    background-color: var(--bg-card) !important;
}
.form-control::placeholder { color: var(--text-muted) !important; opacity: 1; }