/* ========================================
   Auris Klar - Premium AI Earbuds
   Modern Stylesheet with Modal Architecture
   ======================================== */

/* CSS Variables */
:root {
    --primary-color: #0F172A;
    --secondary-color: #3B82F6;
    --accent-color: #F472B6;
    --text-color: #1E293B;
    --text-light: #64748B;
    --background-light: #F8FAFC;
    --white: #FFFFFF;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

body.modal-open {
    overflow: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--primary-color);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #2563EB;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

.btn-secondary {
    background: transparent;
    color: var(--secondary-color);
    border: 2px solid var(--secondary-color);
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-accent {
    color: var(--secondary-color);
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px 0;
}

.nav-link:hover {
    color: var(--secondary-color);
}

.nav-btn {
    padding: 8px 16px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

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

/* Hero Section */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--background-light) 0%, var(--white) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: var(--secondary-color);
    color: var(--white);
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(2.5rem, 4.5vw, 3.5rem);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 40px;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}

.feature-icon {
    font-size: 1.25rem;
}

.hero-pricing {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.price-tag {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.current-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.original-price {
    font-size: 1.5rem;
    color: var(--text-light);
    text-decoration: line-through;
}

.discount-badge {
    padding: 4px 12px;
    background: #DCFCE7;
    color: #16A34A;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 50px;
}

.hero-note {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Product Image */
.product-showcase {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-glow {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.product-img {
    position: relative;
    width: 100%;
    max-width: 500px;
    height: auto;
    z-index: 1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.floating-badge {
    display: none;
}

/* Product Gallery */
.product-gallery {
    padding: 60px 0;
    background: var(--background-light);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.gallery-item {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.gallery-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.gallery-item img {
    width: 100%;
    height: auto;
    display: block;
}

/* Use Cases */
.use-cases {
    padding: 100px 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.use-case-card {
    padding: 32px;
    background: var(--background-light);
    border-radius: var(--border-radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
}

.use-case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.use-case-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.use-case-card h3 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.use-case-card p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0;
}

/* Product Details */
.product-details {
    padding: 100px 0;
    background: var(--background-light);
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.spec-card {
    padding: 32px;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.spec-card:hover {
    box-shadow: var(--shadow-lg);
}

.spec-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.spec-icon {
    font-size: 1.5rem;
}

.spec-header h3 {
    font-size: 1.25rem;
    margin-bottom: 0;
}

.spec-list {
    list-style: none;
}

.spec-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.spec-list li:last-child {
    border-bottom: none;
}

.spec-list strong {
    color: var(--primary-color);
}

/* How It Works */
.how-it-works {
    padding: 100px 0;
    background: var(--white);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.step {
    position: relative;
    text-align: center;
}

.step::after {
    content: '';
    position: absolute;
    top: 30px;
    right: -16px;
    width: 32px;
    height: 2px;
    background: var(--border-color);
}

.step:last-child::after {
    display: none;
}

.step-number {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--secondary-color);
    color: var(--white);
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 50%;
    margin: 0 auto 20px;
}

.step-content h3 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 0;
}

/* Features Section */
.features-section {
    padding: 100px 0;
    background: var(--background-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
}

.feature-highlight {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E3A5F 100%);
    color: var(--white);
}

.feature-highlight h3 {
    color: var(--white);
}

.feature-highlight p {
    color: rgba(255, 255, 255, 0.8);
}

.feature-visual {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-highlights {
    list-style: none;
    margin-top: 16px;
}

.feature-highlights li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: rgba(255, 255, 255, 0.9);
}

.feature-highlights li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* FAQ Section */
.faq-section {
    padding: 100px 0;
    background: var(--white);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

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

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
    background: none;
    border: none;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    text-align: left;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--secondary-color);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding-bottom: 24px;
    color: var(--text-light);
}

/* CTA Section */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1E3A5F 100%);
}

.cta-card {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.cta-pricing {
    margin-bottom: 32px;
}

.price-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 8px;
}

.price-original {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: line-through;
}

.price-current {
    font-size: 3rem;
    font-weight: 700;
    color: var(--white);
}

.price-note {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    margin-bottom: 0;
}

.cta-button {
    background: var(--white);
    color: var(--primary-color);
    margin-bottom: 32px;
}

.cta-button:hover {
    background: var(--accent-color);
    color: var(--white);
}

.payment-methods {
    color: rgba(255, 255, 255, 0.7);
}

.payment-methods span {
    font-size: 0.9rem;
}

.payment-icons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 8px;
}

.payment-icon {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    font-size: 0.85rem;
}

/* Footer */
.footer {
    padding: 80px 0 40px;
    background: var(--primary-color);
    color: var(--white);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    margin-bottom: 20px;
    font-size: 1rem;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a,
.footer-links button,
.link-btn {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links button:hover,
.link-btn:hover {
    color: var(--white);
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 16px;
}

.contact-email {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.contact-email:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

.affiliate-disclosure {
    margin-top: 8px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-xl);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-large {
    max-width: 800px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0;
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-light);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--secondary-color);
    color: var(--white);
}

.modal-body {
    padding: 32px;
    max-height: calc(90vh - 80px);
    overflow-y: auto;
}

/* Contact Modal Styles */
.modal-intro {
    color: var(--text-light);
    margin-bottom: 24px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-item strong {
    display: block;
    margin-bottom: 4px;
    color: var(--primary-color);
}

.contact-item span,
.contact-item a {
    color: var(--text-light);
}

/* Form Styles */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--secondary-color);
}

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

/* Legal Content Styles */
.legal-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.legal-content h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--secondary-color);
}

.legal-content h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.legal-content p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Shipping Content Styles */
.shipping-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.shipping-section h3 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.shipping-list {
    list-style: none;
}

.shipping-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
}

.shipping-list li:last-child {
    border-bottom: none;
}

.return-steps {
    list-style: decimal;
    padding-left: 24px;
    color: var(--text-light);
}

.return-steps li {
    padding: 8px 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        max-width: 100%;
    }

    .hero-pricing {
        justify-content: center;
    }

    .hero-note {
        text-align: center;
    }

    .product-showcase {
        order: -1;
    }

    .product-glow {
        width: 300px;
        height: 300px;
    }

    .product-img {
        max-width: 350px;
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    .step::after {
        display: none;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .header-cta {
        display: none;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

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

    .price-tag {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .current-price {
        font-size: 2rem;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .specs-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps-container {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .modal {
        width: 95%;
        margin: 16px;
    }

    .modal-body {
        padding: 24px;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 100px 0 40px;
    }

    .hero-features {
        align-items: flex-start;
    }

    .btn-large {
        padding: 14px 28px;
        font-size: 1rem;
    }

    .cta-button {
        width: 100%;
    }
}