/* ==============================================================
   🚀 CodeSync Design System & Theme Engine
   Navy • Purple • Violet • Fuchsia
   ============================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
    /* Brand HSL & Hex Tokens */
    --cs-navy-950: #060913;
    --cs-navy-900: #0B1120;
    --cs-navy-800: #0F172A;
    --cs-navy-700: #1E293B;
    --cs-slate-600: #334155;
    --cs-slate-400: #94A3B8;

    --cs-blue-600: #2563EB;
    --cs-blue-500: #3B82F6;
    --cs-blue-400: #60A5FA;

    --cs-purple-700: #6D28D9;
    --cs-purple-600: #7C3AED;
    --cs-purple-500: #8B5CF6;
    --cs-purple-400: #A78BFA;

    --cs-fuchsia-600: #C026D3;
    --cs-fuchsia-500: #D946EF;
    --cs-fuchsia-400: #E879F9;

    --cs-gradient-brand: linear-gradient(135deg, #2563EB 0%, #7C3AED 50%, #D946EF 100%);
    --cs-gradient-subtle: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(124, 58, 237, 0.08) 50%, rgba(217, 70, 239, 0.08) 100%);
    --cs-gradient-card: linear-gradient(145deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
    --cs-gradient-dark-hero: linear-gradient(135deg, #0B1120 0%, #1E1B4B 50%, #0F172A 100%);

    /* ☀️ Light Theme Tokens */
    --bg-color: #F8FAFC;
    --bg-subtle: #F1F5F9;
    --card-bg: #FFFFFF;
    --card-hover-bg: #FFFFFF;
    --border-color: #E2E8F0;
    --border-subtle: #EDF2F7;
    --text-color: #0F172A;
    --text-muted: #64748B;
    --text-heading: #0F172A;
    --nav-bg: rgba(255, 255, 255, 0.88);
    --footer-bg: #0B1120;
    --footer-text: #F8FAFC;
    --footer-muted: #94A3B8;
    --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
    --card-hover-shadow: 0 20px 35px -5px rgba(37, 99, 235, 0.12), 0 8px 10px -4px rgba(37, 99, 235, 0.06);
    --input-bg: #FFFFFF;
    --table-header-bg: #F1F5F9;
}

/* 🌙 Dark Theme System */
[data-bs-theme="dark"] {
    --bg-color: #080E1A;
    --bg-subtle: #0D1527;
    --card-bg: #111A2E;
    --card-hover-bg: #15223C;
    --border-color: #1E2E4A;
    --border-subtle: #152238;
    --text-color: #F8FAFC;
    --text-muted: #94A3B8;
    --text-heading: #FFFFFF;
    --nav-bg: rgba(8, 14, 26, 0.88);
    --footer-bg: #050811;
    --footer-text: #F8FAFC;
    --footer-muted: #94A3B8;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --card-hover-shadow: 0 20px 35px -5px rgba(124, 58, 237, 0.22), 0 8px 12px -4px rgba(37, 99, 235, 0.18);
    --input-bg: #0D1527;
    --table-header-bg: #152238;
}

/* Base Elements */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    letter-spacing: -0.01em;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-heading);
    font-weight: 700;
    letter-spacing: -0.025em;
}

code, pre {
    font-family: 'JetBrains Mono', monospace;
}

/* Gradients and Text Accents */
.text-gradient,
.gradient-text,
.AvCourses {
    background: var(--cs-gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.text-gradient-purple {
    background: linear-gradient(135deg, var(--cs-purple-500), var(--cs-fuchsia-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-brand {
    background: var(--cs-gradient-brand) !important;
}

.bg-gradient-subtle {
    background: var(--cs-gradient-subtle) !important;
}

/* --------------------------------------------------------------
   🔹 Navbar & Header
   -------------------------------------------------------------- */
.navbar {
    background-color: var(--nav-bg) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    padding: 0.75rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-heading) !important;
}

.navbar-brand .brand-badge {
    background: var(--cs-gradient-brand);
    color: white;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(124, 58, 237, 0.3);
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.85rem !important;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nav-link:hover, .nav-link:focus, .nav-link.active {
    color: var(--cs-purple-500) !important;
    background-color: rgba(124, 58, 237, 0.08);
}

.dropdown-menu {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 0.5rem;
}

.dropdown-item {
    color: var(--text-color);
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.dropdown-item:hover, .dropdown-item:focus {
    background-color: rgba(124, 58, 237, 0.1);
    color: var(--cs-purple-500);
}

/* --------------------------------------------------------------
   🔘 Buttons
   -------------------------------------------------------------- */
.btn {
    border-radius: 8px;
    font-weight: 600;
    letter-spacing: -0.01em;
    padding: 0.55rem 1.25rem;
    transition: all 0.2s ease;
}

.btn-primary,
.btn-custom,
#register {
    background: var(--cs-gradient-brand) !important;
    color: white !important;
    border: none !important;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

.btn-primary:hover,
.btn-custom:hover,
#register:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4) !important;
    color: white !important;
}

.btn-outline-primary,
.btn-custom-outline,
#login {
    background: transparent !important;
    border: 1.5px solid var(--cs-purple-500) !important;
    color: var(--cs-purple-500) !important;
    -webkit-text-fill-color: initial !important;
}

.btn-outline-primary:hover,
.btn-custom-outline:hover,
#login:hover {
    background: rgba(124, 58, 237, 0.1) !important;
    color: var(--cs-purple-400) !important;
    border-color: var(--cs-purple-400) !important;
    transform: translateY(-2px);
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: rgba(124, 58, 237, 0.1);
    color: var(--cs-purple-500);
    border-color: var(--cs-purple-500);
}

/* --------------------------------------------------------------
   📦 Cards & Containers
   -------------------------------------------------------------- */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    overflow: hidden;
}

.card:hover, .hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
    border-color: rgba(124, 58, 237, 0.3);
}

.card-header, .card-footer {
    background-color: transparent;
    border-color: var(--border-color);
}

/* Form Controls */
.form-control, .form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-control:focus, .form-select:focus {
    background-color: var(--input-bg);
    color: var(--text-color);
    border-color: var(--cs-purple-500);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

/* Tables */
.table {
    color: var(--text-color);
    border-color: var(--border-color);
    margin-bottom: 0;
}

.table th {
    background-color: var(--table-header-bg);
    color: var(--text-heading);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

.table-hover tbody tr:hover {
    background-color: rgba(124, 58, 237, 0.04);
    color: var(--text-color);
}

[data-bs-theme="dark"] .table {
    --bs-table-bg: var(--card-bg);
    --bs-table-color: var(--text-color);
    --bs-table-border-color: var(--border-color);
}

/* Modals */
.modal-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    color: var(--text-color);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

/* Badges */
.badge-new {
    background: var(--cs-gradient-brand);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.35rem 0.65rem;
    border-radius: 6px;
    letter-spacing: 0.03em;
}

.badge-tag {
    background: rgba(124, 58, 237, 0.1);
    color: var(--cs-purple-500);
    border: 1px solid rgba(124, 58, 237, 0.2);
    font-weight: 600;
    padding: 0.35rem 0.65rem;
    border-radius: 6px;
}

/* --------------------------------------------------------------
   🦶 Footer
   -------------------------------------------------------------- */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 4rem 0 2rem 0;
    border-top: 1px solid var(--border-color);
    position: relative;
}

footer h5, footer h6 {
    color: #FFFFFF !important;
    font-weight: 700;
}

footer p, footer li, footer a, footer span {
    color: var(--footer-muted);
}

footer a {
    text-decoration: none;
    transition: color 0.2s ease, transform 0.2s ease;
    display: inline-block;
}

footer a:hover {
    color: #FFFFFF !important;
    transform: translateX(3px);
}

footer #f-top {
    background: var(--cs-gradient-brand);
    margin-top: -6rem;
    margin-bottom: 3rem;
    padding: 2.25rem 2rem;
    border-radius: 16px;
    color: white;
    box-shadow: 0 15px 35px -5px rgba(124, 58, 237, 0.4);
    font-weight: 600;
    font-size: 1.1rem;
    position: relative;
    z-index: 10;
}

/* Alerts */
.alert {
    border-radius: 10px;
    font-weight: 500;
    border: none;
}
.alert-success {
    background-color: rgba(16, 185, 129, 0.12);
    color: #10B981;
    border-left: 4px solid #10B981;
}
.alert-danger {
    background-color: rgba(239, 68, 68, 0.12);
    color: #EF4444;
    border-left: 4px solid #EF4444;
}
.alert-warning {
    background-color: rgba(245, 158, 11, 0.12);
    color: #F59E0B;
    border-left: 4px solid #F59E0B;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}