:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --background-color: #f3f4f6;
    --card-background: #ffffff;
    --text-color: #1f2937;
    --subtle-text-color: #6b7280;
    --border-color: #d1d5db;
    --error-color: #dc2626;
    --success-color: #16a34a;
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1.5rem;
}

/* Accessibility utility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#app-container {
    width: 100%;
    max-width: 550px;
    background-color: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

header {
    padding: 1.5rem 2rem;
    background-color: #f9fafb;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

#header-logo {
    width: 80px;
    height: 80px;
}

.header-text {
    text-align: left;
}

header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--subtle-text-color);
    font-size: 1rem;
}

main#wizard, main#admin-panel {
    padding: 2rem;
}

.wizard-step {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.wizard-step.active {
    display: block;
}

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

.wizard-step h2 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.wizard-step p {
    color: var(--subtle-text-color);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.code-step-intro {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.code-step-text p {
    margin-bottom: 0;
}

.naamsticker-img {
    flex-shrink: 0;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.form-group input[type="file"] {
    cursor: pointer;
}

.form-group .error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: block;
    min-height: 1.25rem; /* Reserve space */
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.btn:active {
    transform: translateY(1px);
}

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

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

.btn-secondary {
    background-color: #e5e7eb;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #d1d5db;
}

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

.btn-danger:hover {
    background-color: #b91c1c;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.topic-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.topic-btn {
    padding: 1.25rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    background-color: #f9fafb;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.topic-btn:hover {
    border-color: var(--primary-color);
    background-color: #eef2ff;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.topic-icon {
    width: 64px;
    height: 64px;
}

.no-participation-container {
    margin-top: 1.5rem;
}

.details-group {
    display: none;
}

#step-loading, #step-summary, #step-no-participation {
    text-align: center;
}

.loader {
    width: 50px;
    height: 50px;
    border: 5px solid var(--background-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.progress-container {
    width: 100%;
    background-color: var(--border-color);
    border-radius: 999px; /* pill shape */
    height: 1.25rem;
    overflow: hidden;
    margin-bottom: 0.5rem;
    margin-top: 1.5rem;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 999px;
    transition: width 0.3s ease-in-out;
}

.progress-label {
    font-weight: 500;
    color: var(--subtle-text-color);
    margin: 0;
}

.project-specific-message {
    text-align: center;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
}

.summary-card {
    background-color: #f9fafb;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    text-align: left;
    margin-top: 0.75rem;
}

.summary-card-success {
    background-color: #f0fdf4;
    border-color: #a7f3d0;
}

.summary-card-danger {
    background-color: #fef2f2;
    border-color: #fecaca;
    text-align: center;
}

.summary-card-danger p {
    margin-bottom: 0;
    color: var(--text-color);
}

.summary-card h3 {
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

#summary-list {
    list-style-type: none;
}

#summary-list li {
    padding: 0.4rem 0;
    display: flex;
    justify-content: space-between;
}

#summary-list li strong {
    color: var(--subtle-text-color);
}

.summary-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    word-break: break-all;
}

.summary-link:hover {
    text-decoration: underline;
    color: var(--primary-hover);
}

.confirmation-message {
    text-align: center;
    color: var(--subtle-text-color);
    margin-top: 1.5rem;
    font-weight: 500;
}

/* Modal Styles */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(17, 24, 39, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-in-out;
}

#loading-modal .loader {
    width: 60px;
    height: 60px;
    border: 6px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
}

.modal-content {
    background: var(--card-background);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    text-align: center;
    max-width: 400px;
    width: 90%;
    animation: fadeIn 0.3s ease-in-out, slideIn 0.3s ease-in-out;
}

@keyframes slideIn {
    from { transform: translateY(-20px); }
    to { transform: translateY(0); }
}


#error-modal-message {
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.6;
    margin: 0;
    margin-bottom: 1.5rem;
}

#error-modal-close {
    min-width: 120px;
    width: auto;
}

.modal-content .button-group {
    margin-top: 1.5rem;
    justify-content: center; /* Center buttons */
}

.modal-content .button-group .btn {
    width: auto;
    min-width: 100px;
}

/* Ensure global modals are on top of everything */
#error-modal, #confirm-modal, #loading-modal {
    z-index: 2200;
}


/* JS-controlled utility class */
.hidden {
    display: none !important;
}