/* --- CSS Variables for Theming --- */
:root {
    --bg-color: #fafafa;
    --text-color: #1a1a1a;
    --border-color: #e0e0e0;
    --button-bg-color: #ffffff;
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15), 0 10px 10px rgba(0,0,0,0.04);
}

body.dark-mode {
    --bg-color: #0f0f0f;
    --text-color: #f5f5f5;
    --border-color: #2a2a2a;
    --button-bg-color: #1a1a1a;
    --primary-color: #818cf8;
    --secondary-color: #a78bfa;
    --accent-color: #f472b6;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5), 0 4px 6px rgba(0,0,0,0.3);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.6), 0 10px 10px rgba(0,0,0,0.4);
}

/* --- General Body Styles --- */
body {
    margin: 0;
    box-sizing: border-box;
    background: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    transition: background 0.4s cubic-bezier(0.4, 0, 0.2, 1), color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-color);
    overflow-x: hidden;
}

/* Animated gradient background */
body::before {
    content: '';
    position: fixed;
    top: -10%;
    left: -10%;
    width: 120vw;
    height: 120vh;
    background: radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    animation: gradientShift 15s ease infinite;
    pointer-events: none;
    z-index: -1;
}

body.dark-mode::before {
    background: radial-gradient(circle at 20% 50%, rgba(129, 140, 248, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(244, 114, 182, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(167, 139, 250, 0.15) 0%, transparent 50%);
}

@keyframes gradientShift {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(3%, 5%); }
    66% { transform: translate(-3%, 3%); }
}

/* --- Shared styles for full-page views --- */
.page-view {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transform: translateX(100%);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-view.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
}

.welcome-screen.active {
    transform: translateX(0);
}

/* --- Landing Screen --- */
.landing-screen {
    gap: 40px;
    cursor: pointer;
}

.landing-screen.active {
    transform: translateX(0);
    pointer-events: auto !important;
}

.landing-screen:hover #logo-enter {
    transform: scale(1.05);
}

.landing-screen:active #logo-enter {
    transform: scale(0.95);
}

#logo-enter {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: auto;
}

/* --- Password Screen --- */
.password-screen {
    gap: 0;
}

.password-container {
    background: var(--button-bg-color);
    padding: 48px 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    min-width: 400px;
    width: 90%;
    max-width: 500px;
    text-align: center;
}

@media (max-width: 768px) {
    .password-container {
        padding: 32px 24px;
        min-width: unset;
        width: 90%;
        margin: 0 20px;
    }

    .password-title {
        font-size: 24px;
    }

    .password-input {
        font-size: 16px;
        padding: 14px 16px;
    }

    .password-submit {
        padding: 14px 28px;
        font-size: 15px;
    }
}

.password-title {
    font-size: 28px;
    font-weight: 700;
    margin: 0 0 32px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.password-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.password-input {
    padding: 16px 20px;
    font-size: 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-color);
    color: var(--text-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
}

.password-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.password-submit {
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

.password-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.password-submit:active {
    transform: translateY(0);
}

.password-error {
    color: #ef4444;
    font-size: 14px;
    margin: 8px 0 0 0;
    min-height: 20px;
    font-weight: 500;
}

/* --- Welcome Screen --- */
.welcome-screen {
    gap: 60px;
}

.welcome-logo-container {
    text-align: center;
    position: relative;
    display: inline-block;
    animation: fadeInUp 0.8s ease-out;
}

.welcome-logo-container::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.3;
    animation: pulse 4s ease-in-out infinite;
}

.welcome-logo {
    max-width: 100px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
}

.welcome-logo:hover {
    transform: scale(1.05) rotate(5deg);
}

/* --- Main Menu --- */
.main-menu {
    display: flex;
    flex-direction: column;
    gap: 16px;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.menu-button {
    background: var(--button-bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 28px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    min-width: 200px;
}

.menu-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: left 0.4s ease;
    z-index: 0;
}

.menu-button:hover::before {
    left: 0;
}

.menu-button:hover {
    transform: translateX(8px);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-lg);
}

.menu-icon {
    font-size: 22px;
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.menu-text {
    position: relative;
    z-index: 1;
}

.menu-button:hover .menu-icon {
    transform: scale(1.2);
}

/* --- Back Header --- */
.back-header {
    position: fixed;
    top: 30px;
    left: 30px;
    z-index: 10;
}

.back-button {
    background: var(--button-bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 24px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    box-shadow: var(--shadow-md);
}

.back-button:hover {
    transform: translateX(-4px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: transparent;
}

/* --- Main App View --- */
.main-app-view {
    padding-top: 100px;
    overflow-y: auto;
    overflow-x: hidden;
    max-width: 100vw;
}

/* --- Page Load Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* --- Logo Header --- */
.logo-header {
    width: 100%;
    text-align: center;
    margin-bottom: 20px;
    padding-top: 280px;
    animation: fadeInUp 0.8s ease-out;
}

.logo-container {
    text-align: center;
    position: relative;
    display: inline-block;
}

.logo-container::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    filter: blur(50px);
    opacity: 0.3;
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.5; }
}

.logo-img {
    max-width: 90px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.2));
}

.logo-img:hover {
    transform: scale(1.05) rotate(5deg);
}

/* --- Projects Section --- */
.projects-container {
    width: 100%;
    max-width: 1200px;
    padding: 0 20px 40px 20px;
    box-sizing: border-box;
}

.projects-title {
    font-size: 36px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 0;
}

.project-card {
    background: var(--button-bg-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out both;
}

.project-card:nth-child(1) { animation-delay: 0.3s; }
.project-card:nth-child(2) { animation-delay: 0.4s; }
.project-card:nth-child(3) { animation-delay: 0.5s; }
.project-card:nth-child(4) { animation-delay: 0.6s; }
.project-card:nth-child(5) { animation-delay: 0.7s; }
.project-card:nth-child(6) { animation-delay: 0.8s; }

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-status {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-completed {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.status-progress {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.status-new {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.project-icon {
    font-size: 42px;
    margin-bottom: 12px;
    display: inline-block;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-icon-image,
.project-icon-svg {
    font-size: 0;
}

.groningen-flag {
    width: 54px;
    height: 36px;
    border-radius: 6px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(0,0,0,0.1);
}

.project-card:hover .project-icon {
    transform: scale(1.2) rotate(5deg);
}

.project-card:hover .groningen-flag {
    transform: scale(1.15);
}

.project-name {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 12px 0;
    color: var(--text-color);
}

.project-description {
    font-size: 15px;
    color: var(--text-color);
    opacity: 0.7;
    margin: 0 0 20px 0;
    line-height: 1.6;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    position: relative;
}

.project-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: width 0.3s ease;
}

.project-link:hover::after {
    width: 100%;
}

.project-link:hover {
    gap: 12px;
}

/* --- Theme Switcher Styles --- */
.theme-switcher {
    position: fixed;
    top: 30px;
    right: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--button-bg-color);
    padding: 8px 16px;
    border-radius: 50px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 20;
}

.theme-switcher:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, var(--border-color), var(--border-color));
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 28px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

input:checked + .slider {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.theme-switcher-label {
    font-size: 22px;
    transition: transform 0.3s ease;
    cursor: pointer;
}

.theme-switcher:hover .theme-switcher-label {
    transform: scale(1.1);
}

/* --- Contact Page --- */
.contact-view {
    padding-top: 100px;
    overflow-y: auto;
    overflow-x: hidden;
    max-width: 100vw;
}

.contact-container {
    width: 100%;
    max-width: 1000px;
    padding: 20px;
    box-sizing: border-box;
}

.contact-title {
    font-size: 42px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-card {
    background: var(--button-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.contact-card h3 {
    margin: 0 0 8px 0;
    font-size: 18px;
    color: var(--text-color);
}

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.contact-card a:hover {
    color: var(--accent-color);
}

.contact-form-wrapper {
    background: var(--button-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 14px;
}

.form-group input,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

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

.submit-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 12px;
    padding: 16px 32px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-button:active {
    transform: translateY(0);
}

.button-arrow {
    transition: transform 0.3s ease;
}

.submit-button:hover .button-arrow {
    transform: translateX(4px);
}

/* --- Footer --- */
.footer {
    width: 100%;
    padding: 40px 20px 30px 20px;
    margin-top: 40px;
    animation: fadeIn 1s ease-out 0.9s both;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--button-bg-color);
    color: var(--text-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.footer-text {
    color: var(--text-color);
    opacity: 0.6;
    font-size: 14px;
    margin: 0;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .projects-title {
        font-size: 28px;
    }

    .theme-switcher {
        top: 20px;
        right: 20px;
        padding: 6px 12px;
    }

    .logo-header {
        padding-top: 60px;
    }

    .logo-img {
        max-width: 70px;
    }
}