:root {
    --primary-color: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --dark-color: #111827;
    --light-color: #f9fafb;
    --gray-color: #6b7280;
    --success-color: #10b981;
    --border-radius: 12px;
    --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    font-family: var(--font-sans);
    margin: 0;
    padding: 0;
    background-color: var(--light-color);
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    padding: 18px 0;
    background-color: rgba(17, 24, 39, 0.95) !important;
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    transition: background-color 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(17, 24, 39, 0.98) !important;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.75rem;
    color: white !important;
    letter-spacing: -0.025em;
}

.nav-link {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9) !important;
    margin: 0 5px;
    padding: 8px 16px !important;
    border-radius: 8px;
    transition: var(--transition);
}

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

/* Hero Section */
.hero-section {
    background-color: var(--primary-color);
    background-image: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: 8rem 0;
    position: relative;
    overflow: hidden;
    padding-top: 76px; /* Height of navbar plus some spacing */
}

.hero-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='white' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
    opacity: 0.6;
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

.hero-main-content {
    margin-bottom: 80px; /* Add space at the bottom to separate from scroll indicator */
}

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

.display-4 {
    font-weight: 800 !important;
    margin-bottom: 2.5rem !important; /* Increased spacing */
    font-size: 3.75rem;
    letter-spacing: -0.025em;
    line-height: 1.1;
    background: linear-gradient(to right, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.lead {
    font-size: 1.25rem;
    margin-bottom: 3.5rem !important; /* Increased spacing */
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Features Section */
#features {
    position: relative;
    z-index: 2;
    background: white;
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.features-wrapper {
    background-color: white;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    padding: 4rem;
    max-width: 1100px;
    margin: 0 auto;
}

.features-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-weight: 800;
    color: var(--dark-color);
    font-size: 2.5rem;
    letter-spacing: -0.025em;
    position: relative;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    height: 4px;
    width: 60px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.section-subtitle {
    color: var(--gray-color);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Feature cards */
#features .row {
    margin-top: 2rem;
}

#features .col-lg-4, 
#features .col-md-6 {
    padding: 1rem;
    display: flex;
}

.feature-card {
    border: none;
    background-color: white;
    border-radius: 16px;
    padding: 1.5rem;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.feature-icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin-bottom: 1.25rem;
    background-color: #eef4ff;
    border-radius: 12px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon-container {
    transform: scale(1.05);
}

.feature-card h4 {
    font-weight: 700;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    color: var(--dark-color);
    letter-spacing: -0.01em;
}

.feature-card p {
    color: var(--gray-color);
    line-height: 1.6;
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Buttons */
.btn {
    padding: 0.8rem 2.5rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::after {
    opacity: 1;
}

.btn-light {
    background-color: white;
    color: var(--primary-color);
    border: none;
}

.btn-light:hover {
    background-color: white;
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Buy Me Coffee Button */
.bmc-navbar {
    display: inline-flex !important;
    align-items: center;
    padding: 8px 15px !important;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50px !important;
    margin-left: 10px;
    transition: var(--transition);
    backdrop-filter: blur(4px);
}

.bmc-navbar:hover {
    background-color: rgba(255, 255, 255, 0.2) !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.bmc-navbar svg {
    margin-right: 8px;
}

/* Loader */
.loader {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(8px);
}

.spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.25em;
}

.loader-message {
    color: white;
    font-size: 1.2rem;
    margin-top: 1rem;
    font-weight: 500;
    text-align: center;
}

/* Media Queries */
@media (max-width: 992px) {
    .features-wrapper {
        padding: 3rem 2rem;
    }
}

@media (max-width: 768px) {
    .features-wrapper {
        padding: 2rem 1.5rem;
    }
    
    .display-4 {
        font-size: 2.75rem;
    }
    
    .hero-section {
        padding: 5rem 0;
    }
    
    .btn {
        padding: 0.7rem 1.75rem;
    }

    .section-title {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 1.25rem;
    }
    
    .feature-icon-container {
        width: 56px;
        height: 56px;
    }
}

/* Custom Background Effect */
@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* Start Exam Button */
.start-exam-btn {
    background-color: white;
    color: var(--primary-color) !important;
    font-weight: 700;
    padding: 0.9rem 3rem;
    font-size: 1.1rem;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
    display: inline-block;
    border: none;
}

.start-exam-btn:hover {
    background-color: white !important;
    color: var(--primary-color) !important;
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

/* Add these styles for the modal */
.modal-content {
    border-radius: 16px;
    border: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem 1.5rem;
}

.modal-header .modal-title {
    font-weight: 700;
    color: var(--dark-color);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem 1.5rem;
}

.form-select:focus,
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(79, 70, 229, 0.25);
}

.alert-info {
    background-color: #eef4ff;
    border-color: #d1e0ff;
    color: var(--primary-dark);
}

/* Button styles for modal */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* Exam status badge */
.exam-status {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
}

.status-evaluating {
    background-color: #f0ad4e;
    color: white;
}

.status-evaluated {
    background-color: #5cb85c;
    color: white;
}

/* View Results button visibility */
.view-results-btn-container {
    transition: opacity 0.3s ease;
}

/* Add these styles to the existing index.css file */

.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.loading-content {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    max-width: 500px;
    width: 90%;
}

/* Renamed classes to avoid conflict with Bootstrap */
.custom-progress-bar {
    width: 100%;
    height: 20px;
    background: #f0f0f0;
    border-radius: 10px;
    margin: 1rem 0;
    overflow: hidden;
}

.custom-progress {
    width: 0%;
    height: 100%;
    background: #4CAF50;
    transition: width 0.3s ease;
}

.loading-message {
    margin: 1rem 0;
    color: #666;
}

.exam-info {
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.5rem;
}

/* Exam meta styles that were added dynamically in JavaScript */
.exam-meta {
    color: #4a5568;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
}

.exam-meta-container {
    border-top-color: rgba(0, 0, 0, 0.1);
}

.exam-details {
    word-wrap: break-word;
}

/* Full height hero section */
.full-height {
    min-height: 100vh;
    padding: 0;
    margin: 0;
}

/* Scroll indicator - animation removed */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 0;
    right: 0;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    /* animation: bounce 2s infinite; - removed */
    z-index: 2;
}

.scroll-indicator p {
    margin-bottom: 5px;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.scroll-indicator i {
    font-size: 20px;
}

/* Position the features section after the full-height hero */
#features {
    position: relative;
    z-index: 2;
    background: white;
    padding-top: 6rem;
    padding-bottom: 6rem;
}