:root {
    --wu-yellow: #FFDE00;
    --wu-black: #000000;
    --wu-dark-gray: #1a1a1a;
    --wu-light-gray: #f4f4f6;
    --wu-border: #e0e0e0;
    --text-primary: #111111;
    --text-secondary: #555555;
    --white: #ffffff;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--wu-light-gray);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--wu-black);
    color: var(--wu-yellow);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    display: flex;
    align-items: flex-start;
}

.logo-text {
    text-transform: uppercase;
}

.logo-reg {
    font-size: 10px;
    margin-left: 2px;
    margin-top: 2px;
}

.geo-tag {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--white);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 80px 0;
    background-image: linear-gradient(rgba(0, 0, 0, 0.65), rgba(0, 0, 0, 0.65)), url('https://images.unsplash.com/photo-1573164713988-8665fc963095?auto=format&fit=crop&q=80&w=2069');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.survey-wrapper {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
    margin-bottom: 40px;
}

/* Trust Features */
.trust-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    color: var(--white);
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.feature svg {
    color: var(--wu-yellow);
}

.feature span {
    font-size: 14px;
    font-weight: 500;
    text-shadow: 0 1px 4px rgba(0,0,0,0.5);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    width: 100%;
}

.btn-primary {
    background-color: var(--wu-yellow);
    color: var(--wu-black);
}

.btn-primary:hover {
    background-color: #e6c800;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 222, 0, 0.3);
}

.btn-option {
    background-color: var(--white);
    color: var(--text-primary);
    border: 2px solid var(--wu-border);
    margin-bottom: 12px;
    text-align: left;
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 500;
}

.btn-option:hover {
    border-color: var(--wu-black);
    background-color: #fafafa;
}

.btn-option.selected {
    border-color: var(--wu-black);
    background-color: var(--wu-black);
    color: var(--wu-yellow);
}

/* Intro Screen */
.intro-screen {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.intro-screen h1 {
    font-size: 32px;
    margin-bottom: 16px;
    color: var(--wu-black);
}

.intro-screen p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* Survey Container */
.survey-container {
    animation: fadeIn 0.5s ease;
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background-color: var(--wu-light-gray);
    border-radius: 3px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--wu-yellow);
    width: 0%;
    transition: width 0.4s ease;
}

.question-header {
    margin-bottom: 24px;
}

.question-counter {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.question-title {
    font-size: 24px;
    font-weight: 700;
    margin-top: 8px;
    margin-bottom: 32px;
    color: var(--wu-black);
}

.options-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Success Screen */
.success-screen {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.success-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--wu-yellow);
    color: var(--wu-black);
    margin-bottom: 24px;
}

.success-screen h2 {
    font-size: 28px;
    margin-bottom: 16px;
}

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

/* Footer */
.footer {
    background-color: var(--white);
    padding: 24px 0;
    border-top: 1px solid var(--wu-border);
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.footer p {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--wu-black);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Utilities */
.hidden {
    display: none !important;
}

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

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

.slide-in {
    animation: slideInRight 0.4s ease forwards;
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}