/* ===================================
   Exam Simulator - Custom Styles
   =================================== */

/* Root Variables for Branding */
:root {
    --primary-color: #0d6efd;
    --primary-dark: #0a58ca;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --info-color: #0dcaf0;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --dark-bg: #212529;
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --border-radius: 0.375rem;
    --transition: all 0.3s ease;
}

/* ===================================
   General Styles
   =================================== */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #212529;
    background-color: #ffffff;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* ===================================
   Navigation Bar
   =================================== */

.navbar {
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    transition: var(--transition);
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.nav-link {
    font-weight: 500;
    transition: var(--transition);
    border-radius: var(--border-radius);
    margin: 0 0.25rem;
    padding: 0.5rem 1rem !important;
}

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

/* ===================================
   Cards & Shadows
   =================================== */

.card {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.shadow-sm {
    box-shadow: var(--shadow-sm) !important;
}

.shadow {
    box-shadow: var(--shadow) !important;
}

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

.hover-lift {
    transition: var(--transition);
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Buttons
   =================================== */

.btn {
    font-weight: 500;
    border-radius: var(--border-radius);
    padding: 0.5rem 1.5rem;
    transition: var(--transition);
}

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

.btn:active {
    transform: translateY(0);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

/* ===================================
   Forms
   =================================== */

.form-control,
.form-select {
    border-radius: var(--border-radius);
    border: 1px solid #dee2e6;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-control-lg {
    padding: 1rem 1.25rem;
    font-size: 1.1rem;
}

.form-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #495057;
}

/* ===================================
   Login & Register Pages
   =================================== */

.login-page,
.register-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
}

.login-page::before,
.register-page::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.3;
}

.login-page .card,
.register-page .card {
    position: relative;
    z-index: 1;
}

/* ===================================
   Dashboard Styles
   =================================== */

.hero-section {
    padding: 4rem 0;
}

.feature-icon {
    transition: var(--transition);
}

.feature-icon:hover {
    transform: rotate(10deg) scale(1.1);
}

/* Statistics Cards */
.card-body h3 {
    font-weight: 700;
    color: #212529;
}

/* ===================================
   Alerts & Flash Messages
   =================================== */

.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
}

.alert-success {
    background-color: #d1e7dd;
    color: #0f5132;
}

.alert-danger {
    background-color: #f8d7da;
    color: #842029;
}

.alert-info {
    background-color: #cff4fc;
    color: #055160;
}

.alert-warning {
    background-color: #fff3cd;
    color: #664d03;
}

/* ===================================
   Footer
   =================================== */

footer {
    margin-top: auto;
}

footer a:hover {
    color: #ffffff !important;
    text-decoration: underline !important;
}

/* ===================================
   Utilities
   =================================== */

.min-vh-100 {
    min-height: 100vh;
}

.text-muted {
    color: #6c757d !important;
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* ===================================
   Responsive Adjustments
   =================================== */

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.1rem;
    }

    .display-3 {
        font-size: 2.5rem;
    }

    .display-5 {
        font-size: 2rem;
    }

    .hero-section {
        padding: 2rem 0;
    }

    .card-body {
        padding: 1.5rem !important;
    }
}

@media (max-width: 576px) {
    .btn-lg {
        padding: 0.5rem 1.5rem;
        font-size: 1rem;
    }

    .navbar {
        padding: 0.5rem 0;
    }
}

/* ===================================
   Dark Mode Support (Optional)
   =================================== */

@media (prefers-color-scheme: dark) {
    /* Add dark mode styles here if needed */
}

/* ===================================
   Animation Classes
   =================================== */

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

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

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

.slide-in {
    animation: slideIn 0.5s ease-in-out;
}

/* ===================================
   Custom Scrollbar
   =================================== */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    footer,
    .btn,
    .alert {
        display: none !important;
    }
}