/* ==========================================================================
   LMS CUSTOM STYLES (Moodle-Inspired Theme)
   We use Tailwind and Bootstrap via CDN, but these are our custom overrides
   for a professional LMS look.
   ========================================================================== */

:root {
    --lms-bg-light: #f1f5f9; /* slate-100 */
    --lms-text-light: #0f172a; /* slate-900 (Darker for light mode) */
    --lms-sidebar-light: #ffffff;
    --lms-border-light: #cbd5e1; /* slate-300 (More distinct) */
    --lms-primary: #4338ca; /* indigo-700 (Deeper for contrast) */
    --lms-primary-hover: #3730a3;
    --lms-secondary-bg: #f8fafc;
    
    --lms-bg-dark: #020617; /* Slate-950 (Blacker for contrast) */
    --lms-text-dark: #ffffff; /* Pure white for dark mode */
    --lms-sidebar-dark: #0f172a; /* slate-900 */
    --lms-border-dark: #334155; /* slate-700 */
}

body {
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1), color 0.4s;
    background-color: var(--lms-bg-light);
    color: var(--lms-text-light);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-weight: 450; /* Slightly heavier than normal for better legibility */
    margin: 0;
    padding: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* Dark Mode Classes */
body.dark-mode {
    background-color: var(--lms-bg-dark);
    color: var(--lms-text-dark);
}

body.dark-mode .lms-sidebar {
    background-color: var(--lms-sidebar-dark);
    border-right-color: var(--lms-border-dark);
}

body.dark-mode .lms-card {
    background-color: rgba(30, 41, 59, 0.7); /* slate-800 with transparency */
    border-color: var(--lms-border-dark);
    backdrop-filter: blur(8px);
}

body.dark-mode .lms-header {
    background-color: rgba(15, 23, 42, 0.8);
    border-bottom-color: var(--lms-border-dark);
    backdrop-filter: blur(12px);
}

body.dark-mode .tab-btn {
    color: #94a3b8;
}

body.dark-mode .tab-btn.active {
    color: #818cf8; /* indigo-400 */
    border-bottom: 2px solid #818cf8;
    background-color: rgba(99, 102, 241, 0.1);
}

body.dark-mode .accordion-button {
    background-color: #1e293b;
    color: var(--lms-text-dark);
}
body.dark-mode .accordion-item {
    background-color: #1e293b;
    border-color: var(--lms-border-dark);
}
body.dark-mode .accordion-button:not(.collapsed) {
    background-color: rgba(99, 102, 241, 0.15);
    color: #818cf8;
}
body.dark-mode .list-group-item {
    background-color: transparent;
    color: var(--lms-text-dark);
    border-color: var(--lms-border-dark);
}
body.dark-mode .list-group-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

/* Layout */
.lms-wrapper {
    display: flex;
    min-height: 100vh;
}

.lms-sidebar {
    width: 260px;
    background-color: var(--lms-sidebar-light);
    border-right: 1px solid var(--lms-border-light);
    transition: transform 0.3s ease-in-out;
    height: 100vh;
    position: fixed;
    overflow-y: auto;
    z-index: 1000;
}

.lms-main {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
}

.lms-header {
    background-color: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid var(--lms-border-light);
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: blur(10px);
}

.lms-content {
    padding: 2.5rem;
    flex: 1;
}

/* Components */
.lms-card {
    background-color: var(--lms-sidebar-light);
    border: 1px solid var(--lms-border-light);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    margin-bottom: 2rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.lms-card:hover {
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

.btn-primary-lms {
    background-color: var(--lms-primary);
    color: white;
    border: none;
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary-lms:hover {
    background-color: var(--lms-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Tabs */
.tabs-header {
    display: flex;
    border-bottom: 1px solid var(--lms-border-light);
    margin-bottom: 1.5rem;
}
.tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: none;
    color: var(--lms-text-light);
    cursor: pointer;
    font-weight: 500;
    border-bottom: 2px solid transparent;
}
.tab-btn.active {
    color: var(--lms-primary);
    border-bottom: 2px solid var(--lms-primary);
    background-color: var(--lms-secondary-bg);
}

.tab-pane {
    display: none;
}
.tab-pane.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Submodule list styling */
.submodule-item {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.submodule-item:hover {
    background-color: rgba(79, 70, 229, 0.05);
}
.status-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
}
.status-badge.completed {
    background-color: #10b981;
    color: white;
}
.status-badge.pending {
    background-color: #6b7280;
    color: white;
}

/* Fix Bootstrap vs Tailwind Collapse Conflict */
.collapse.show {
    visibility: visible !important;
    display: block;
}
.collapse:not(.show) {
    display: none !important;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .lms-sidebar {
        transform: translateX(-100%);
    }
    .lms-sidebar.open {
        transform: translateX(0);
    }
    .lms-main {
        margin-left: 0;
    }
}

/* Drag and Drop Styles */
.student-card.dragging {
    opacity: 0.5;
    transform: scale(0.95);
    cursor: grabbing;
}

.group-drop-zone {
    transition: background-color 0.2s, border-color 0.2s;
}

.group-drop-zone.drag-over {
    background-color: rgba(79, 70, 229, 0.1) !important;
    border: 2px dashed #4F46E5 !important;
}

/* Teacher Session Mode Styles */
.teacher-mode-active .lms-sidebar,
.teacher-mode-active .lms-header nav,
.teacher-mode-active #nav-dashboard,
.teacher-mode-active #nav-students,
.teacher-mode-active #sidebar-courses-list {
    display: none !important;
}

.teacher-mode-active .lms-main {
    margin-left: 0 !important;
}

.teacher-mode-active .lms-content {
    padding: 1.5rem;
}

.btn-start-session {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

.btn-start-session:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
    filter: brightness(1.1);
}

.teacher-view-card {
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

body.teacher-mode-active {
    background-color: #f8fafc;
}

body.dark-mode.teacher-mode-active {
    background-color: #020617;
}


/* Drag and Drop Finance */
.payment-drop-zone.drag-over {
    background-color: rgb(238 242 255 / 0.5);
    border-color: rgb(129 140 248);
    transform: scale(1.02);
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.draggable-student {
    cursor: grab;
    transition: all 0.2s ease;
}

.draggable-student:active {
    cursor: grabbing;
}

.draggable-student:hover {
    transform: translateX(4px);
    background-color: rgb(249 250 251);
}

.dark .draggable-student:hover {
    background-color: rgb(31 41 55 / 0.5);
}

.dragging {
    opacity: 0.5;
    transform: scale(0.95);
}

.custom-scrollbar::-webkit-scrollbar {
    width: 4px;
}

.custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
    background: #e2e8f0;
    border-radius: 10px;
}

.dark .custom-scrollbar::-webkit-scrollbar-thumb {
    background: #334155;
}
/* Coin Keeper Node Styles */
.finance-node {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: white;
    border: 3px solid transparent;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    cursor: pointer;
    flex-shrink: 0;
}

.dark .finance-node {
    background: #1e293b;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

.finance-node:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

.finance-node i {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.finance-node span.name {
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #475569;
    max-width: 90px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.finance-node span.balance {
    font-size: 0.75rem;
    font-weight: 900;
    color: #0f172a;
    margin-top: 0.1rem;
}

.dark .finance-node span.name { color: #cbd5e1; }
.dark .finance-node span.balance { color: #f8fafc; }

/* Node Drag States */
.finance-node.draggable {
    cursor: grab;
}
.finance-node.draggable:active {
    cursor: grabbing;
}

.finance-node.dragging {
    opacity: 0.6;
    transform: scale(0.9);
}

.finance-node.drag-over {
    transform: scale(1.1);
    border-style: dashed;
    box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.1);
}

.finance-node[data-color="indigo"].drag-over { border-color: #6366f1; box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.2); }
.finance-node[data-color="rose"].drag-over { border-color: #f43f5e; box-shadow: 0 0 0 8px rgba(244, 63, 94, 0.2); }
.finance-node[data-color="amber"].drag-over { border-color: #f59e0b; box-shadow: 0 0 0 8px rgba(245, 158, 11, 0.2); }
.finance-node[data-color="emerald"].drag-over { border-color: #10b981; box-shadow: 0 0 0 8px rgba(16, 185, 129, 0.2); }