/* ===== De Haagse Hogeschool & ADS&AI Brand Colors & Base Styles ===== */
:root {
    /* De Haagse Hogeschool Colors */
    --primary-color: #1a3a52;         /* Donker blauw (DHH) */
    --secondary-color: #2d5a7b;       /* Middel blauw (DHH) */
    
    /* ADS&AI Accent Colors */
    --accent-color: #00bcd4;          /* Cyaan/Turquoise (ADS&AI) */
    --accent-dark: #0097a7;           /* Donkerder cyaan */
    --accent-light: #b2ebf2;          /* Licht cyaan */
    
    /* Text Colors */
    --text-primary: #1a3a52;          /* Donker blauw */
    --text-secondary: #546e7a;        /* Middel grijs */
    --text-light: #90a4ae;            /* Licht grijs */
    --background: #ffffff;            /* Wit */
    --background-light: #eceff1;      /* Zeer licht grijs */
    --border-color: #cfd8dc;          /* Grijs border */
    
    /* Additional Colors */
    --success-color: #4caf50;
    --error-color: #f44336;
    --warning-color: #ff9800;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(26, 58, 82, 0.12);
    --shadow-md: 0 4px 6px rgba(26, 58, 82, 0.15);
    --shadow-lg: 0 10px 20px rgba(26, 58, 82, 0.2);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
}

/* ===== Container & Layout ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Navigation ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-bottom: 3px solid var(--accent-color);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    letter-spacing: 1px;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--accent-light);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.btn-nav {
    background: var(--accent-color);
    color: var(--primary-color) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.btn-nav:hover {
    background: var(--accent-dark);
    color: white !important;
}

.btn-nav::after {
    display: none;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0.1;
    transform: translate(50%, -50%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-light);
    margin-bottom: var(--spacing-md);
    font-weight: 300;
    letter-spacing: 1px;
}

.hero-description {
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.9);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-submit {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.1rem;
}

/* ===== About Section ===== */
.about {
    padding: var(--spacing-2xl) 0;
    background: var(--background-light);
}

.about h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.about h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.about-content {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--accent-color);
    box-shadow: var(--shadow-sm);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.1rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.about-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--accent-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

/* ===== Form Section ===== */
.form-section {
    padding: var(--spacing-2xl) 0;
    background: var(--background-light);
}

.form-section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.form-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-2xl);
}

.submission-form {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--accent-color);
    max-width: 800px;
    margin: var(--spacing-2xl) auto;
    box-shadow: var(--shadow-md);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
    background: white;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.1);
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-group select {
    cursor: pointer;
}

.form-note {
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: var(--spacing-md);
}

.success-message {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    color: #155724;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--success-color);
    margin-top: var(--spacing-lg);
    font-weight: 600;
    animation: slideIn 0.3s ease;
}

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

/* ===== Projects Section ===== */
.projects {
    padding: var(--spacing-2xl) 0;
}

.projects h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.projects h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-type {
    background: white;
    border: 2px solid var(--accent-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.project-header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-dark));
    color: white;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-header h3 {
    font-size: 1.5rem;
    margin: 0;
}


.project-description {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    font-size: 1rem;
    line-height: 1.6;
}

.project-details {
    padding: var(--spacing-lg);
}

.project-details h4 {
    color: var(--primary-color);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.project-details h4:first-child {
    margin-top: 0;
}

.project-details ul {
    list-style: none;
    padding-left: 0;
}

.project-details li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    padding-left: var(--spacing-md);
    position: relative;
}

.project-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.project-details p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}


/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-2xl) 0;
}

.contact h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--primary-color);
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.contact h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 2px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.contact-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--accent-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.contact-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.contact-title {
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.contact-info {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

.contact-info a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.contact-info a:hover {
    color: var(--accent-dark);
    text-decoration: underline;
}

/* ===== Footer ===== */
.footer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 3px solid var(--accent-color);
}

.footer p {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-menu {
        gap: var(--spacing-md);
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .about h2,
    .form-section h2,
    .contact h2 {
        font-size: 2rem;
    }

    .submission-form {
        padding: var(--spacing-lg);
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .nav-menu {
        gap: var(--spacing-sm);
        font-size: 0.8rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    .hero {
        padding: var(--spacing-lg) 0;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .about h2,
    .form-section h2,
    .contact h2 {
        font-size: 1.5rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .submission-form {
        padding: var(--spacing-md);
    }
}