/* EduMentorAI Main Styles - Dark Mode Compatible */
:root {
    --primary-color: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary-color: #374151;
    --background-light: #f9fafb;
    --background-dark: #1f2937;
    --background-color: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border-color: #e5e7eb;
    --border-color-dark: #374151;
    --chat-bg: #ffffff;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --sidebar-bg: #f8fafc;
    --success-color: #059669;
    --warning-color: #d97706;
    --danger-color: #dc2626;
    --info-color: #0ea5e9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 0.5rem;
    --border-radius-sm: 0.25rem;
    --border-radius-lg: 0.75rem;
    --transition: all 0.2s ease;
}

/* Dark mode variables - these will be applied when [data-theme="dark"] is set */
[data-theme="dark"] {
    --primary-color: #22c55e;       /* Green 500 */
    --primary-dark: #16a34a;        /* Green 600 */
    --primary-light: #86efac;       /* Green 200 */
    --secondary-color: #9ca3af;     /* Gray 400 */
    --background-light: #111827;    /* Slate 800 */
    --background-dark: #0b1220;     /* Custom deep slate */
    --background-color: #0b1220;
    --text-primary: #e5e7eb;        /* Gray 200 */
    --text-secondary: #9ca3af;      /* Gray 400 */
    --text-muted: #6b7280;          /* Gray 500 */
    --border-color: #1f2937;        /* Slate 800 */
    --border-color-dark: #374151;   /* Slate 700 */
    --chat-bg: #111827;             /* Slate 800 */
    --card-bg: #0f172a;             /* Slate 900 */
    --input-bg: #0f172a;            /* Slate 900 */
    --sidebar-bg: #0f172a;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #38bdf8;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--background-color);
    padding-top: 76px; /* Account for fixed navbar */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s var(--transition), color 0.3s var(--transition);
}

/* Ensure readable text/link colors in dark mode */
[data-theme="dark"] body,
[data-theme="dark"] p,
[data-theme="dark"] li,
[data-theme="dark"] span,
[data-theme="dark"] label,
[data-theme="dark"] small {
    color: var(--text-primary);
}

[data-theme="dark"] a {
    color: var(--primary-color);
}

[data-theme="dark"] a:hover,
[data-theme="dark"] a:focus {
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    padding-bottom: 2rem;
    background-color: var(--background-color);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    letter-spacing: -0.5px;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

/* Custom Bootstrap Overrides */
.btn {
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    padding: 0.5rem 1rem;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: white;
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
    border-radius: var(--border-radius);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border-radius: var(--border-radius-sm);
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
    background: var(--card-bg);
    color: var(--text-primary);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    background: var(--chat-bg);
    border-bottom: 1px solid var(--border-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
    padding: 1.25rem;
    color: var(--text-primary);
}

.card-body {
    padding: 1.25rem;
    background: var(--chat-bg);
    color: var(--text-primary);
}

.card-footer {
    background: var(--background-light);
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 var(--border-radius) var(--border-radius) !important;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
}

/* Forms */
.form-control, .form-select {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0.75rem;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--input-bg);
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
    background-color: var(--chat-bg);
    color: var(--text-primary);
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-floating > .form-control,
.form-floating > .form-select {
    padding: 1rem 0.75rem;
    background-color: var(--chat-bg);
    color: var(--text-primary);
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%) !important;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* User Avatar */
.user-avatar {
    position: relative;
}

.avatar-placeholder {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

/* Dashboard Cards */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* Chat Interface */
.chat-container {
    height: calc(100vh - 200px);
    background: var(--chat-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.5rem;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--background-light);
}

.message {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.message.ai .message-avatar {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--text-secondary) 100%);
    color: white;
}

.message-content {
    background: var(--chat-bg);
    border-radius: var(--border-radius);
    padding: 1rem;
    max-width: 70%;
    box-shadow: var(--shadow-sm);
    position: relative;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.chat-input {
    background: var(--chat-bg);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
}

.chat-input .form-control {
    border-radius: var(--border-radius-lg);
    padding: 1rem;
    font-size: 1rem;
    resize: none;
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

/* Document Cards */
.document-card {
    transition: all 0.3s ease;
    cursor: pointer;
}

.document-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.document-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.document-icon.pdf {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

.document-icon.docx {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
}

.document-icon.txt {
    background: linear-gradient(135deg, var(--text-secondary) 0%, var(--text-muted) 100%);
    color: white;
}

.document-icon.pptx {
    background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%);
    color: white;
}

/* Quiz Cards */
.quiz-card {
    border-left: 4px solid var(--primary-color);
}

.quiz-score {
    background: linear-gradient(135deg, var(--success-color) 0%, #047857 100%);
    color: white;
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 0.875rem;
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: var(--border-radius-sm);
    background-color: var(--border-color);
}

.progress-bar {
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

/* Badges */
.badge {
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
}

/* Tables */
.table {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    color: var(--text-primary);
}

.table thead th {
    background: var(--background-light);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.table tbody tr {
    transition: all 0.2s ease;
}

.table tbody tr:hover {
    background-color: var(--background-light);
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    font-weight: 500;
}

.alert-primary {
    background-color: rgb(37 99 235 / 0.1);
    color: var(--primary-dark);
}

.alert-success {
    background-color: rgb(5 150 105 / 0.1);
    color: var(--success-color);
}

.alert-warning {
    background-color: rgb(217 119 6 / 0.1);
    color: var(--warning-color);
}

.alert-danger {
    background-color: rgb(220 38 38 / 0.1);
    color: var(--danger-color);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-xl);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

/* Dropzone */
.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: var(--card-bg);
    color: var(--text-primary);
}

.dropzone:hover,
.dropzone.dragover {
    border-color: var(--primary-color);
    background: var(--background-light);
}

.dropzone-icon {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.dropzone:hover .dropzone-icon,
.dropzone.dragover .dropzone-icon {
    color: var(--primary-color);
}

/* Sidebar */
.sidebar {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 100px;
    border: 1px solid var(--border-color);
}

.sidebar-item {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
    cursor: pointer;
    margin-bottom: 0.5rem;
    border: 1px solid transparent;
    color: var(--text-primary);
}

.sidebar-item:hover {
    background: var(--background-light);
    border-color: var(--border-color);
}

.sidebar-item.active {
    background: var(--primary-color);
    color: white;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    background: var(--card-bg) !important;
    margin-top: auto;
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .stat-card {
        padding: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .chat-container {
        height: calc(100vh - 150px);
    }
    
    .message-content {
        max-width: 90%;
    }
    
    .sidebar {
        position: static;
        margin-bottom: 2rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--background-light);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--background-dark);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--border-color-dark);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

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

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.border-radius-lg {
    border-radius: var(--border-radius-lg) !important;
}

.border-radius-sm {
    border-radius: var(--border-radius-sm) !important;
}

.shadow-custom {
    box-shadow: var(--shadow);
}

.shadow-custom-lg {
    box-shadow: var(--shadow-lg);
}

.shadow-custom-xl {
    box-shadow: var(--shadow-xl);
}