/* Modern Survey Website Styles */
:root {
    --primary-color: #4A90E2;
    --secondary-color: #357ABD;
    --accent-color: #50C878;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-color: #E1E8ED;
    --error-color: #E74C3C;
    --success-color: #27AE60;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --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, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 1.5rem;
    font-weight: 700;
    transition: var(--transition);
}

.logo:hover {
    color: var(--primary-color);
    transform: scale(1.05);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

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

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

nav a:hover {
    color: var(--primary-color);
}

nav a:hover::after {
    width: 100%;
}

/* Main Content */
main {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    width: 100%;
}

/* Hero Section */
.hero {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    border: none;
    cursor: pointer;
}

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

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

/* Progress Bar */
.progress-container {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-dark);
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 10px;
    transition: width 0.5s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Question Card */
.question-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease;
}

.question-card h2 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.question-description {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 2rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.radio-group, .checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.radio-option, .checkbox-option {
    display: flex;
    align-items: center;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-white);
}

.radio-option:hover, .checkbox-option:hover {
    border-color: var(--primary-color);
    background: rgba(74, 144, 226, 0.05);
    transform: translateX(5px);
}

.radio-option input, .checkbox-option input {
    margin-right: 1rem;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.radio-option.selected, .checkbox-option.selected {
    border-color: var(--primary-color);
    background: rgba(74, 144, 226, 0.1);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea,
select {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

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

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    margin-top: 2rem;
}

.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

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

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

.btn:disabled:hover {
    transform: none;
}

/* Content Section */
.content-section {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease;
}

.content-section h1 {
    font-size: 2.25rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
}

.content-section h2 {
    font-size: 1.75rem;
    color: var(--text-dark);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-section h3 {
    font-size: 1.375rem;
    color: var(--text-dark);
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.content-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-light);
}

.content-section ul, .content-section ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

/* Footer */
footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 2rem 1rem;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* Cookie Consent Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--text-dark);
    color: white;
    padding: 1.5rem;
    box-shadow: 0 -4px 6px rgba(0,0,0,0.1);
    z-index: 2000;
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.cookie-banner.show {
    transform: translateY(0);
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-text {
    flex: 1;
}

.cookie-buttons {
    display: flex;
    gap: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    nav ul {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .hero {
        padding: 2rem 1.5rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

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

    .question-card {
        padding: 1.5rem;
    }

    .question-card h2 {
        font-size: 1.375rem;
    }

    .navigation-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .content-section {
        padding: 1.5rem;
    }

    .content-section h1 {
        font-size: 1.75rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .cookie-content {
        flex-direction: column;
        text-align: center;
    }

    .cookie-buttons {
        flex-direction: column;
        width: 100%;
    }

    .cookie-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0 1rem;
    }

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

    .question-card h2 {
        font-size: 1.25rem;
    }

    .content-section h1 {
        font-size: 1.5rem;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden {
    display: none;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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