/* ========================================
   Brain & Sound - Landing Page CSS
   Color Scheme: Dark Navy (#0B0F19) + Gold (#C5A059)
   Font: Noto Sans KR
======================================== */

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

:root {
    --primary-dark: #0B0F19;
    --primary-gold: #C5A059;
    --gold-hover: #D4B170;
    --text-light: #FFFFFF;
    --text-gray: #A0A0A0;
    --bg-secondary: #14161F;
    --bg-card: #1A1D2A;
    --border-color: rgba(197, 160, 89, 0.2);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--primary-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section Spacing */
section {
    padding: 80px 0;
    position: relative;
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-gold);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-gray);
}

@media (max-width: 768px) {
    .section-header h2 {
        font-size: 2rem;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 15px 35px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-gold), var(--gold-hover));
    color: var(--primary-dark);
    box-shadow: 0 4px 15px rgba(197, 160, 89, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(197, 160, 89, 0.5);
}

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

.btn-outline:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
}

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

.btn-outline-gold:hover {
    background: var(--primary-gold);
    color: var(--primary-dark);
}

.btn-large {
    padding: 20px 50px;
    font-size: 1.2rem;
    margin: 30px 0;
}

.btn-large i {
    margin-right: 10px;
}

/* ========================================
   Hero Section
======================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #0B0F19 0%, #1A1D2A 100%);
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(197, 160, 89, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(197, 160, 89, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 15, 25, 0.3);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 20px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.logo i {
    font-size: 3rem;
    color: var(--primary-gold);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-light);
}

.hero-subtitle {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 25px;
    line-height: 1.4;
    color: var(--primary-gold);
}

.hero-description {
    font-size: 1.3rem;
    margin-bottom: 40px;
    color: var(--text-gray);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    font-size: 2rem;
    color: var(--primary-gold);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
}

/* ========================================
   Solution Section
======================================== */
.solution-section {
    background: var(--bg-secondary);
}

.problems {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.problem-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    background: var(--bg-card);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.problem-item i {
    font-size: 2rem;
    color: #E74C3C;
}

.problem-item p {
    font-size: 1.1rem;
}

.divider {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-gold), transparent);
    margin: 50px 0;
}

.solution-content h3 {
    font-size: 2rem;
    color: var(--primary-gold);
    text-align: center;
    margin-bottom: 10px;
}

.solution-subtitle {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.solutions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.solution-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 30px;
    background: var(--bg-card);
    border-radius: 15px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.solution-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-gold);
    box-shadow: 0 10px 30px rgba(197, 160, 89, 0.2);
}

.solution-item i {
    font-size: 2.5rem;
    color: var(--primary-gold);
}

.solution-item h4 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.solution-item p {
    color: var(--text-gray);
}

/* ========================================
   Program Section
======================================== */
.program-section {
    background: var(--primary-dark);
}

.program-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.step-card {
    flex: 1;
    min-width: 280px;
    max-width: 350px;
    background: var(--bg-card);
    padding: 40px 30px;
    border-radius: 20px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.step-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-gold);
    box-shadow: 0 15px 40px rgba(197, 160, 89, 0.3);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 30px;
    background: var(--primary-gold);
    color: var(--primary-dark);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
}

.step-icon {
    text-align: center;
    margin-bottom: 20px;
}

.step-icon i {
    font-size: 3.5rem;
    color: var(--primary-gold);
}

.step-card h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-gold);
}

.step-description {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 25px;
    line-height: 1.6;
}

.step-details {
    list-style: none;
}

.step-details li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-gray);
}

.step-details li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-gold);
    font-weight: bold;
}

.step-arrow {
    font-size: 2rem;
    color: var(--primary-gold);
}

@media (max-width: 1024px) {
    .step-arrow {
        display: none;
    }
}

/* ========================================
   Pricing Section
======================================== */
.pricing-section {
    background: var(--bg-secondary);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.pricing-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(197, 160, 89, 0.3);
}

.pricing-card.featured {
    border-color: var(--primary-gold);
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(197, 160, 89, 0.1) 100%);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 40px;
    background: var(--primary-gold);
    color: var(--primary-dark);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
}

.pricing-badge.popular {
    background: linear-gradient(135deg, var(--primary-gold), var(--gold-hover));
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(197, 160, 89, 0.7);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(197, 160, 89, 0);
    }
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.price .amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-gold);
}

.price .currency {
    font-size: 1.3rem;
    color: var(--text-gray);
}

.price-note {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-top: 10px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i {
    color: var(--primary-gold);
    font-size: 1.1rem;
}

.pricing-comparison {
    text-align: center;
}

.comparison-box {
    display: inline-block;
    background: var(--bg-card);
    padding: 25px 40px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
}

.comparison-box i {
    color: var(--primary-gold);
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.comparison-box p {
    margin: 10px 0;
}

.comparison-note {
    font-size: 0.9rem;
    color: var(--text-gray);
}

/* ========================================
   Evidence Section
======================================== */
.evidence-section {
    background: var(--primary-dark);
}

.evidence-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.evidence-card {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
}

.evidence-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-gold);
    box-shadow: 0 15px 40px rgba(197, 160, 89, 0.3);
}

.evidence-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, var(--primary-gold), var(--gold-hover));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.evidence-icon i {
    font-size: 2.5rem;
    color: var(--primary-dark);
}

.evidence-card h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--primary-gold);
}

.evidence-content {
    text-align: left;
}

.evidence-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    margin-bottom: 10px;
    background: rgba(197, 160, 89, 0.05);
    border-radius: 10px;
}

.evidence-item i {
    font-size: 1.5rem;
    color: var(--primary-gold);
}

.evidence-note {
    text-align: center;
    padding: 25px;
    background: var(--bg-card);
    border-radius: 15px;
    border: 1px solid var(--border-color);
}

.evidence-note i {
    font-size: 2rem;
    color: var(--primary-gold);
    margin-right: 15px;
}

/* ========================================
   Contact Section
======================================== */
.contact-section {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--primary-dark) 100%);
    padding: 100px 0;
}

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

.contact-content h2 {
    font-size: 3rem;
    color: var(--primary-gold);
    margin-bottom: 20px;
}

.contact-subtitle {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 50px 0;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding: 20px;
    background: var(--bg-card);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.contact-item:hover {
    border-color: var(--primary-gold);
    transform: translateX(5px);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-gold);
}

.contact-item a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 1.1rem;
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--primary-gold);
}

.brand-footer {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.brand-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.brand-logo i {
    font-size: 2.5rem;
    color: var(--primary-gold);
}

.brand-logo span {
    font-size: 2rem;
    font-weight: 700;
}

.brand-tagline {
    color: var(--text-gray);
    font-style: italic;
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--primary-dark);
    padding: 30px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* ========================================
   Animations
======================================== */
.fade-in {
    animation: fadeIn 1s ease-in;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 768px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .problems {
        grid-template-columns: 1fr;
    }
    
    .solutions {
        grid-template-columns: 1fr;
    }
    
    .program-steps {
        flex-direction: column;
    }
    
    .step-card {
        max-width: 100%;
    }
    
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .evidence-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content h2 {
        font-size: 2rem;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .price .amount {
        font-size: 2.5rem;
    }
    
    .step-icon i {
        font-size: 2.5rem;
    }
}