:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-rgb: 37, 99, 235;
    --secondary: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-main: #0f172a;
    --text-muted: #475569;
    --border: #e2e8f0;
    --accent: #3b82f6;
    --success: #10b981;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --background: #090d16;
    --surface: #131b2e;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1e293b;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.4), 0 8px 10px -6px rgb(0 0 0 / 0.4);
}

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

body {
    font-family: var(--font-family, 'Outfit'), -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow);
    z-index: 100;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--primary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    position: absolute;
    transition: var(--transition);
}

.sun-icon {
    opacity: 1;
    transform: rotate(0deg);
    stroke: #eab308;
}

.moon-icon {
    opacity: 0;
    transform: rotate(90deg);
    stroke: var(--text-muted);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* Survey Layout */
.survey-container {
    background: var(--surface);
    width: 100%;
    max-width: 680px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    padding: 40px;
    position: relative;
    transition: var(--transition);
}

@media (max-width: 640px) {
    .survey-container {
        padding: 24px;
        border-radius: var(--radius-md);
    }
}

.survey-header {
    margin-bottom: 32px;
}

.logo-container {
    display: inline-block;
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    padding: 6px 16px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.survey-header h1 {
    font-size: 1.85rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 8px;
    color: var(--text-main);
}

.survey-header .subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
}

/* Progress Indicator */
.progress-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-bar-container {
    background: var(--border);
    height: 6px;
    border-radius: 100px;
    width: 100%;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    height: 100%;
    width: 0%;
    border-radius: 100px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Steps and Wizard Transition */
.survey-step {
    display: none;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.35s ease, transform 0.35s ease;
}

.survey-step.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* Questions styling */
.question-card {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.question-card:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: var(--shadow);
}

.question-text {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-main);
    white-space: pre-line;
}

/* Custom inputs (Radio and Checkbox) */
.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-item {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    user-select: none;
}

.option-item:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.02);
}

.option-item input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.control-indicator {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    margin-right: 14px;
    display: inline-block;
    transition: var(--transition);
}

/* Radio Specific */
.option-item input[type="radio"] + .control-indicator {
    border-radius: 50%;
}

.option-item input[type="radio"]:checked + .control-indicator {
    border-color: var(--primary);
    background-color: var(--primary);
    box-shadow: inset 0 0 0 4px var(--surface);
}

/* Checkbox Specific */
.option-item input[type="checkbox"] + .control-indicator {
    border-radius: 4px;
}

.option-item input[type="checkbox"]:checked + .control-indicator {
    border-color: var(--primary);
    background-color: var(--primary);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-size: 14px;
    background-repeat: no-repeat;
    background-position: center;
}

.option-item input:checked ~ span:not(.control-indicator) {
    color: var(--primary);
}

.option-item input:checked {
    border-color: var(--primary);
}

.option-item:has(input:checked) {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 32px;
}

.btn {
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:not(:disabled):hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

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

.btn-secondary:not(:disabled):hover {
    background-color: var(--background);
    border-color: var(--text-muted);
}

/* Consent description box */
.consent-box {
    background: rgba(var(--primary-rgb), 0.03);
    border-left: 4px solid var(--primary);
    padding: 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin-bottom: 24px;
    white-space: pre-line;
}

/* Error message styling */
.error-msg {
    color: #ef4444;
    font-size: 0.85rem;
    margin-top: 8px;
    display: none;
    font-weight: 500;
}

.question-card.has-error {
    border-color: #ef4444 !important;
    background: rgba(239, 68, 68, 0.02);
}

.question-card.has-error .error-msg {
    display: block;
}

/* Success Overlay */
.success-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(9, 13, 22, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 1000;
}

.success-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.success-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 48px;
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 480px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: var(--transition);
}

.success-overlay.show .success-card {
    transform: scale(1);
}

.success-icon {
    width: 72px;
    height: 72px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.success-icon svg {
    width: 36px;
    height: 36px;
}

.success-card h2 {
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.success-card p {
    color: var(--text-muted);
    margin-bottom: 32px;
}

/* Login Overlay */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(9, 13, 22, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 2000;
}

.login-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.login-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 40px;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: var(--transition);
}

.login-overlay.show .login-card {
    transform: scale(1);
}

.login-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    text-align: center;
}

.login-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-muted);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--background);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.login-error {
    color: #ef4444;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 8px;
    text-align: center;
    display: none;
}

/* Dashboard Navigation Tabs */
.dashboard-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 2px solid var(--border);
    margin-bottom: 32px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    color: var(--primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary);
    border-radius: 100px;
}

/* Dashboard Sections */
.dashboard-section {
    display: none;
}

.dashboard-section.active {
    display: block;
}

/* Color theme radio selectors in settings */
.theme-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
}

.theme-card {
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.theme-card:hover {
    border-color: var(--primary);
}

.theme-card.active {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.theme-color-preview {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--surface);
    box-shadow: 0 0 0 2px var(--border);
}