/* 
 * Ekalavya Custom Premium Design Tokens & Stylesheet 
 * Author: abhiram B
 */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --accent-gradient: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    --bg-dark: #0b0f19;
    --bg-light: #f8fafc;
    --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
    --card-shadow-hover: 0 10px 30px -4px rgba(15, 23, 42, 0.12);
    --border-radius: 14px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --text-main: #334155;
    --text-dark: #0f172a;
}

body {
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
}

/* Glassmorphism Cards */
.glass-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.glass-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-2px);
}

/* Sidebar Styling */
.sidebar {
    background-color: var(--primary);
    color: #ffffff;
    height: 100vh;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.sidebar .nav-link {
    color: #94a3b8;
    font-weight: 500;
    padding: 12px 20px;
    border-radius: 8px;
    margin: 4px 15px;
    transition: var(--transition);
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

.sidebar .nav-link.active {
    background: var(--accent-gradient);
}

/* Premium Gradient Header Banner */
.premium-banner {
    background: linear-gradient(135deg, #090d16 0%, #1e293b 100%);
    color: #ffffff;
    border-radius: 16px;
    padding: 40px;
    position: relative;
    overflow: hidden;
}

.premium-banner::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.2) 0%, transparent 70%);
}

/* Timed buttons & badge */
.badge-premium {
    background: rgba(14, 165, 233, 0.1);
    color: var(--accent);
    font-weight: 600;
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: 30px;
    padding: 6px 14px;
}

/* Safe viewer watermark layer */
.viewer-wrapper {
    position: relative;
    user-select: none;
    -webkit-user-select: none;
}

.watermark-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
    opacity: 0.12;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    grid-template-rows: repeat(auto-fill, minmax(150px, 1fr));
    gap: 20px;
    transform: rotate(-25deg) scale(1.2);
}

.watermark-item {
    font-size: 14px;
    font-weight: 600;
    color: #000;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Flow chart layout for curriculum nodes */
.flow-tree {
    display: flex;
    flex-direction: column;
    gap: 30px;
    position: relative;
    padding-left: 20px;
}

.flow-tree::before {
    content: '';
    position: absolute;
    top: 0;
    left: 8px;
    bottom: 0;
    width: 2px;
    background-color: #cbd5e1;
}

.flow-node {
    position: relative;
    padding-left: 25px;
}

.flow-node::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 2px solid #ffffff;
    box-shadow: 0 0 0 2px var(--accent);
    z-index: 2;
}

/* Select2 / Select Custom Styles */
.custom-select-create {
    position: relative;
}

/* Blurring mechanism on tab switch */
.blur-filter {
    filter: blur(15px);
    pointer-events: none;
    transition: filter 0.2s ease;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Sidebar Responsiveness & Toggle Animations */
@media (max-width: 767.98px) {
    .sidebar {
        position: fixed !important;
        top: 0;
        left: 0;
        width: 280px !important;
        height: 100vh !important;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        z-index: 99999 !important;
        display: block !important;
        visibility: visible !important;
    }
    .sidebar.show {
        transform: translateX(0);
        box-shadow: 0 0 30px rgba(0,0,0,0.4) !important;
    }
    main {
        margin-left: 0 !important;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    main {
        margin-left: 25% !important;
    }
    .sidebar {
        width: 25% !important;
    }
}

@media (min-width: 992px) {
    main {
        margin-left: 16.666667% !important;
    }
    .sidebar {
        width: 16.666667% !important;
    }
}

/* ----------------------------------------------------------------
 * Premium Student Dark Mode Theme Stylesheet Overrides
 * ---------------------------------------------------------------- */
.dark-mode {
    --bg-light: #0b0f19;
    --text-main: #94a3b8;
    --text-dark: #f8fafc;
}

.dark-mode body {
    background-color: #0b0f19 !important;
    color: #94a3b8 !important;
}

.dark-mode .bg-light {
    background-color: #1e293b !important;
}

.dark-mode .text-dark,
.dark-mode .h1, .dark-mode .h2, .dark-mode .h3, .dark-mode .h4, .dark-mode .h5, .dark-mode .h6,
.dark-mode h1, .dark-mode h2, .dark-mode h3, .dark-mode h4, .dark-mode h5, .dark-mode h6 {
    color: #f8fafc !important;
}

.dark-mode .bg-white,
.dark-mode .navbar,
.dark-mode .glass-card,
.dark-mode .card,
.dark-mode .modal-content,
.dark-mode .list-group-item {
    background-color: #1e293b !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    color: #f8fafc !important;
}

.dark-mode .border,
.dark-mode .border-bottom,
.dark-mode .border-top,
.dark-mode .border-start,
.dark-mode .border-end {
    border-color: rgba(255, 255, 255, 0.1) !important;
}

.dark-mode .breadcrumb-item a,
.dark-mode .text-muted,
.dark-mode .form-text,
.dark-mode .text-white-50 {
    color: #64748b !important;
}

.dark-mode input,
.dark-mode select,
.dark-mode textarea {
    background-color: #0f172a !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    color: #f8fafc !important;
}

.dark-mode input:focus,
.dark-mode select:focus,
.dark-mode textarea:focus {
    background-color: #0f172a !important;
    color: #f8fafc !important;
    border-color: var(--accent) !important;
}

.dark-mode .btn-outline-dark {
    color: #f8fafc !important;
    border-color: #f8fafc !important;
}

.dark-mode .btn-outline-dark:hover {
    background-color: #f8fafc !important;
    color: #0f172a !important;
}

.dark-mode #preloader {
    background-color: #0b0f19 !important;
}

.dark-mode .preloader-frame {
    background: #0b0f19 !important;
}

.dark-mode .hover-card:hover {
    background-color: #334155 !important;
}

.dark-mode .bg-light.p-3 {
    background-color: #1e293b !important;
    border-color: rgba(255, 255, 255, 0.05) !important;
}

.dark-mode .text-dark.h-100 {
    color: #f8fafc !important;
}

.dark-mode .p-3.rounded-4.bg-light {
    background-color: #111827 !important;
    border-color: rgba(255, 255, 255, 0.05) !important;
}

.dark-mode .p-3.rounded-4.bg-light:hover {
    background-color: #1f2937 !important;
}

.dark-mode .nav-tabs .nav-link.active {
    background-color: #1e293b !important;
    color: #f8fafc !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}

.dark-mode .vjs-control-bar {
    background: rgba(15, 23, 42, 0.9) !important;
}

/* Course flow & explorer panel dark mode fixes */
.dark-mode .explorer-card {
    background: #1e293b !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}

.dark-mode .explorer-card:hover {
    background: #334155 !important;
    border-color: var(--accent) !important;
}

.dark-mode .breadcrumb-custom {
    background-color: #1e293b !important;
    color: #f8fafc !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
}

.dark-mode .breadcrumb-custom-item.active {
    color: #94a3b8 !important;
}

.dark-mode .explorer-pane .glass-card[style*="background"] {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%) !important;
    border: 1px solid rgba(255, 255, 255, 0.05) !important;
}

.dark-mode .list-group-item-action {
    background-color: #1e293b !important;
    color: #f8fafc !important;
}

.dark-mode .list-group-item-action:hover {
    background-color: #334155 !important;
}

.dark-mode .badge.bg-white {
    background-color: #0f172a !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
    color: var(--accent) !important;
}

.dark-mode .watermark-overlay {
    opacity: 0.12 !important;
}

.dark-mode .watermark-item {
    color: rgba(255, 255, 255, 0.25) !important;
}

.dark-mode label {
    color: #f8fafc !important;
}

.dark-mode .form-check-input {
    background-color: #0f172a !important;
    border-color: rgba(255, 255, 255, 0.2) !important;
}

.dark-mode .form-check-input:checked {
    background-color: var(--accent) !important;
    border-color: var(--accent) !important;
}

.dark-mode .breadcrumb {
    background-color: transparent !important;
}

.dark-mode .breadcrumb-item a {
    color: var(--accent) !important;
}

.dark-mode .breadcrumb-item.active {
    color: #f8fafc !important;
}