/* ============================================
   AI Song Gifts - Styles
   ============================================ */

/* CSS Variables */
:root {
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #48bb78;
    --text: #2d3748;
    --text-light: #718096;
    --bg: #ffffff;
    --bg-light: #f7fafc;
    --bg-dark: #1a202c;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

h1, h2, h3, h4 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-submit {
    width: 100%;
    padding: 18px 32px;
    font-size: 18px;
}

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 80px 0 100px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.gradient-text {
    background: linear-gradient(90deg, #ffecd2, #fcb69f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0.95;
}

/* Demo Player */
.demo-player {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 400px;
    margin: 0 auto 40px;
}

.demo-player h3 {
    margin-bottom: 16px;
    font-size: 1.1rem;
}

.demo-player audio {
    width: 100%;
    height: 40px;
}

.demo-note {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 12px;
}

/* Benefits */
.benefits {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.benefit {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.15);
    padding: 12px 20px;
    border-radius: 50px;
    font-size: 15px;
    backdrop-filter: blur(10px);
}

.benefit-icon {
    font-size: 20px;
}

/* Form Section */
.form-section {
    padding: 80px 0;
    background: var(--bg-light);
}

.form-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text);
}

.form-intro {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 40px;
}

.song-form {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

/* Form Groups */
.form-group {
    margin-bottom: 28px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-hint {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 6px;
    display: block;
}

.char-count {
    text-align: right;
}

/* Radio Cards */
.radio-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px;
}

.radio-card {
    cursor: pointer;
}

.radio-card input {
    display: none;
}

.radio-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 16px 12px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    text-align: center;
}

.radio-card input:checked + .radio-content {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
}

.radio-icon {
    font-size: 24px;
}

.radio-label {
    font-size: 14px;
    font-weight: 500;
}

/* Pricing Cards */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

@media (max-width: 500px) {
    .pricing-cards {
        grid-template-columns: 1fr;
    }
}

.pricing-card {
    cursor: pointer;
}

.pricing-card input {
    display: none;
}

.pricing-content {
    position: relative;
    padding: 24px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    text-align: center;
}

.pricing-card.featured .pricing-content {
    border-color: var(--primary);
}

.pricing-card input:checked + .pricing-content {
    border-color: var(--primary);
    background: rgba(102, 126, 234, 0.05);
    box-shadow: var(--shadow);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-card.featured .pricing-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.pricing-content h3 {
    font-size: 1.3rem;
    margin: 12px 0 8px;
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

.pricing-content ul {
    list-style: none;
    text-align: left;
}

.pricing-content li {
    padding: 6px 0;
    font-size: 14px;
    color: var(--text-light);
}

/* Total Price */
.total-price {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    font-size: 1.2rem;
    font-weight: 600;
}

#total-amount {
    font-size: 1.5rem;
    color: var(--primary);
}

/* Checkbox */
.checkbox-group {
    margin-bottom: 24px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-light);
}

.checkbox-label input {
    margin-top: 3px;
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* Trust Badges */
.trust-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 24px;
}

.trust-badge {
    font-size: 13px;
    color: var(--text-light);
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
    background: white;
}

.faq-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-item summary {
    padding: 20px 0;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: '+';
    font-size: 24px;
    color: var(--primary);
    transition: var(--transition);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 0 20px;
    color: var(--text-light);
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

.disclaimer {
    margin-top: 8px;
    font-size: 12px !important;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
    padding: 40px 20px;
}

.modal:target {
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: var(--radius);
    max-width: 600px;
    width: 100%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-light);
}

.modal-content h2 {
    margin-bottom: 24px;
}

.modal-content h3 {
    margin: 20px 0 10px;
    font-size: 1.1rem;
}

.modal-content p {
    color: var(--text-light);
    margin-bottom: 12px;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.overlay.hidden {
    display: none;
}

.overlay-content {
    background: white;
    padding: 50px;
    border-radius: var(--radius);
    text-align: center;
    max-width: 500px;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: var(--accent);
    color: white;
    font-size: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.overlay-content h2 {
    margin-bottom: 16px;
}

.overlay-content p {
    color: var(--text-light);
    margin-bottom: 12px;
}

.success-note {
    font-size: 14px;
    margin-bottom: 24px !important;
}

/* Spinner */
.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 24px;
}

.spinner-small {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

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

    .benefits {
        flex-direction: column;
        align-items: center;
    }

    .song-form {
        padding: 24px;
    }

    .radio-group {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .footer-links {
        justify-content: center;
    }

    .overlay-content {
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .radio-group {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-section h2 {
        font-size: 1.5rem;
    }
}