/* QueryQuest Custom Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #1f2937;
    --light-bg: #f9fafb;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --sidebar-width: 280px;
    --bottom-nav-height: 60px;
}

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

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

/* Mobile-first responsive design */
.main-container {
    min-height: 100vh;
    padding-bottom: var(--bottom-nav-height);
}

/* Desktop layout */
@media (min-width: 768px) {
    .main-container {
        display: flex;
        padding-bottom: 0;
    }
    
    .sidebar {
        width: var(--sidebar-width);
        background: white;
        border-right: 1px solid var(--border-color);
        position: fixed;
        height: 100vh;
        overflow-y: auto;
        z-index: 40;
        transition: transform 0.3s ease;
    }
    
    .main-content {
        flex: 1;
        margin-left: var(--sidebar-width);
        min-height: 100vh;
    }
    
    .bottom-nav {
        display: none;
    }
}

/* Mobile layout */
@media (max-width: 767px) {
    .sidebar {
        display: none;
    }
    
    .main-content {
        width: 100%;
        padding-bottom: var(--bottom-nav-height);
    }
    
    .bottom-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--bottom-nav-height);
        background: white;
        border-top: 1px solid var(--border-color);
        display: flex;
        justify-content: space-around;
        align-items: center;
        z-index: 50;
    }
}

/* Header styles */
.header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 30;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Sidebar styles */
.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--light-bg);
    border-left-color: var(--primary-color);
}

.nav-item.active {
    background-color: #eff6ff;
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

.nav-item svg {
    width: 20px;
    height: 20px;
    margin-right: 12px;
}

/* Bottom navigation styles */
.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem;
    transition: color 0.2s ease;
    min-width: 60px;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
    color: var(--primary-color);
}

.bottom-nav-item svg {
    width: 24px;
    height: 24px;
    margin-bottom: 4px;
}

.bottom-nav-item span {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Card styles */
.card {
    background: white;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card-header {
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Button styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
}

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--light-bg);
}

/* Form styles */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    transition: border-color 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Alert styles */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-color: #a7f3d0;
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
    border-color: #fecaca;
}

.alert-warning {
    background-color: #fed7aa;
    color: #92400e;
    border-color: #fdba74;
}

/* Progress bar */
.progress {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

/* Loading spinner */
.spinner {
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Mobile app view for students */
.mobile-app-view {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.mobile-app-header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* Code editor styles */
.code-editor {
    background: #1e1e1e;
    color: #d4d4d4;
    border-radius: 0.5rem;
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    overflow-x: auto;
}

/* Responsive utilities */
.hidden-mobile {
    display: block;
}

.hidden-desktop {
    display: none;
}

@media (max-width: 767px) {
    .hidden-mobile {
        display: none;
    }
    
    .hidden-desktop {
        display: block;
    }
}

/* Animations */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}