/* GradingPen Dashboard Styles */

:root {
    --ocean-blue: #0A2463;
    --ocean-blue-light: #1e3a8a;
    --ocean-blue-dark: #051529;
    --cyan: #00B4D8;
    --cyan-light: #0ea5e9;
    --cyan-dark: #0891b2;
    --amber: #F77F00;
    --amber-light: #fb923c;
    --amber-dark: #c2410c;
    
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --font-heading: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    
    --sidebar-width: 280px;
    --topbar-height: 70px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
}

/* Dashboard Layout */
.dashboard {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--ocean-blue) 0%, var(--ocean-blue-dark) 100%);
    color: white;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.1);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: white;
}

.sidebar-logo svg {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.sidebar-logo-text {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 800;
    line-height: 1.2;
}

.sidebar-logo-subtitle {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.7;
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: 24px 0;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 15px;
}

.sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.sidebar-nav a.active {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border-left: 4px solid var(--amber);
    padding-left: 20px;
}

.sidebar-nav-icon {
    font-size: 20px;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--cyan), var(--amber));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-email {
    font-size: 12px;
    opacity: 0.7;
    whitespace: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-logout {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
    margin-top: 12px;
    width: 100%;
}

.sidebar-logout:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    background: white;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.topbar-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--ocean-blue);
    font-family: var(--font-heading);
}

.topbar-actions {
    margin-left: auto;
    display: flex;
    gap: 12px;
    align-items: center;
}

/* Content Area */
.content {
    flex: 1;
    padding: 32px;
}

/* Cards */
.card {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--gray-200);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--ocean-blue);
    font-family: var(--font-heading);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    justify-content: center;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--ocean-blue), var(--cyan));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(10, 36, 99, 0.2);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-success {
    background: #10b981;
    color: white;
}

.btn-success:hover {
    background: #059669;
}

.btn-danger {
    background: #ef4444;
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-amber {
    background: var(--amber);
    color: white;
}

.btn-amber:hover {
    background: var(--amber-dark);
    transform: translateY(-2px);
}

.btn:disabled,
.btn.loading {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-size: 14px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.2s;
    background: white;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    color: #ef4444;
    font-size: 13px;
    margin-top: 6px;
}

.form-hint {
    color: var(--gray-500);
    font-size: 13px;
    margin-top: 6px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.stat-icon.blue {
    background: linear-gradient(135deg, var(--ocean-blue), var(--cyan));
    color: white;
}

.stat-icon.amber {
    background: linear-gradient(135deg, var(--amber), var(--amber-light));
    color: white;
}

.stat-icon.green {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
}

.stat-info {
    flex: 1;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-500);
    font-weight: 500;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-900);
    font-family: var(--font-heading);
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    background: white;
    color: var(--gray-800);
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    min-width: 300px;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 4px solid var(--cyan);
}

.toast-show {
    opacity: 1;
    transform: translateX(0);
}

.toast-success {
    border-left-color: #10b981;
}

.toast-error {
    border-left-color: #ef4444;
}

.toast-warning {
    border-left-color: var(--amber);
}

/* Loading States */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s ease-in-out infinite;
    border-radius: 8px;
}

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

/* Empty States */
.empty-state {
    text-align: center;
    padding: 64px 32px;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.empty-state-text {
    color: var(--gray-500);
    margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .content {
        padding: 20px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.grid {
    display: grid;
}

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }

/* === Loading States === */
.skeleton {
    background: linear-gradient(90deg, #1e293b 25%, #334155 50%, #1e293b 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 8px;
    min-height: 20px;
}
@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.skeleton-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 12px;
    padding: 24px;
}
.skeleton-line { height: 16px; margin-bottom: 12px; border-radius: 4px; }
.skeleton-line.short { width: 40%; }
.skeleton-line.medium { width: 65%; }
.skeleton-line.long { width: 90%; }
.skeleton-circle { width: 48px; height: 48px; border-radius: 50%; }

/* Grading progress animation */
.grading-progress-container {
    background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(124,58,237,0.1));
    border: 1px solid rgba(0,180,216,0.2);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    margin: 12px 0;
}
.grading-progress-bar {
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    overflow: hidden;
    margin: 12px 0;
}
.grading-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #00B4D8, #7c3aed);
    border-radius: 3px;
    transition: width 0.5s ease;
}
.grading-status-message {
    color: #94a3b8;
    font-size: 14px;
    min-height: 20px;
    transition: opacity 0.3s;
}
.grading-status-message .emoji { 
    display: inline-block;
    animation: bounce 0.6s ease infinite alternate;
}
@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-4px); }
}