/* Version 3: Dark & Modern */

/* CSS Variables */
:root {
    --primary-color: #06b6d4;
    --primary-hover: #0891b2;
    --secondary-color: #8b5cf6;
    --accent-color: #f59e0b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-hover: #334155;
    --gradient-mesh: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --glow-cyan: 0 0 20px rgba(6, 182, 212, 0.5);
    --glow-purple: 0 0 20px rgba(139, 92, 246, 0.5);
    --spacing-unit: 8px;
    --border-radius: 16px;
    --box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    --box-shadow-lg: 0 20px 40px -10px rgb(0 0 0 / 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', 'Roboto', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--dark-bg);
}

/* Accessibility: Focus Visible */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
    border-radius: 4px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-brand {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: var(--glow-cyan);
    font-family: 'Courier New', monospace;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.3s;
    position: relative;
}

.nav-links a:hover {
    color: var(--primary-color);
    text-shadow: var(--glow-cyan);
}

.btn-primary-small {
    padding: 8px 20px;
    background: var(--primary-color);
    color: var(--dark-bg);
    border-radius: 8px;
    font-weight: 700;
    box-shadow: var(--glow-cyan);
    transition: all 0.3s;
}

.btn-primary-small:hover {
    background: var(--primary-hover);
    color: var(--dark-bg);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.7);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: radial-gradient(circle at 20% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                var(--dark-bg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
    filter: blur(80px);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-shadow: 0 0 40px rgba(6, 182, 212, 0.3);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.btn-primary {
    padding: 16px 32px;
    background: var(--primary-color);
    color: var(--dark-bg);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 18px;
    transition: all 0.3s;
    display: inline-block;
    box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.8), 0 8px 20px rgba(0, 0, 0, 0.4);
}

.btn-secondary {
    padding: 16px 32px;
    background: transparent;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 18px;
    border: 2px solid var(--primary-color);
    transition: all 0.3s;
    display: inline-block;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    box-shadow: var(--glow-cyan);
}

.hero-trust {
    display: flex;
    gap: 48px;
}

.trust-item {
    text-align: left;
}

.trust-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 4px;
    text-shadow: var(--glow-cyan);
}

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

.hero-image {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Problem Section */
.problem-section {
    padding: 80px 0;
    background: var(--dark-bg);
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 56px;
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 56px;
}

.problem-card {
    padding: 40px;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
    transition: all 0.3s;
}

.problem-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
}

.problem-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.problem-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.problem-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Solution Section */
.solution-section {
    padding: 80px 0;
    background: radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                var(--dark-bg);
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.solution-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.solution-benefits {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    color: var(--text-primary);
    padding: 16px;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s;
}

.benefit-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.benefit-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.solution-image {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 0 40px rgba(139, 92, 246, 0.3), var(--box-shadow-lg);
}

.solution-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: var(--dark-bg);
}

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

.feature-card {
    padding: 32px;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all 0.3s;
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Showcase Gallery */
.showcase-section {
    padding: 80px 0;
    background: radial-gradient(circle at 30% 50%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
                var(--dark-bg);
}

.showcase-gallery {
    position: relative;
    margin-top: 56px;
}

.gallery-container {
    overflow: hidden;
    border-radius: 16px;
}

.gallery-track {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding: 8px;
    scrollbar-width: thin;
}

.gallery-track::-webkit-scrollbar {
    height: 8px;
}

.gallery-track::-webkit-scrollbar-track {
    background: var(--dark-card);
    border-radius: 4px;
}

.gallery-track::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
    box-shadow: var(--glow-cyan);
}

.gallery-item {
    flex: 0 0 600px;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: all 0.3s;
}

.gallery-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
}

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

.gallery-caption {
    padding: 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.gallery-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
}

.gallery-nav:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    box-shadow: var(--glow-cyan);
}

.gallery-nav-left {
    left: -24px;
}

.gallery-nav-right {
    right: -24px;
}

/* Process Section */
.process-section {
    padding: 80px 0;
    background: var(--dark-bg);
}

.process-timeline {
    display: flex;
    justify-content: space-between;
    gap: 32px;
    margin-top: 56px;
    position: relative;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    z-index: 0;
    box-shadow: var(--glow-cyan);
}

.process-step {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.process-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--dark-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    margin: 0 auto 20px;
    border: 3px solid var(--dark-bg);
    box-shadow: var(--glow-cyan);
}

.process-step h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

/* Pricing Section */
.pricing-section {
    padding: 80px 0;
    background: radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                var(--dark-bg);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 56px;
}

.pricing-card {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    transition: all 0.3s;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
}

.pricing-featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.3), var(--box-shadow-lg);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: 40px;
    background: linear-gradient(135deg, var(--accent-color), #ef4444);
    color: var(--dark-bg);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.5);
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.pricing-header h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.pricing-price {
    margin-bottom: 8px;
}

.price-amount {
    font-size: 42px;
    font-weight: 800;
    color: var(--primary-color);
    text-shadow: var(--glow-cyan);
}

.price-plus {
    font-size: 24px;
    color: var(--text-secondary);
}

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

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

.pricing-feature {
    display: flex;
    align-items: start;
    gap: 12px;
    font-size: 15px;
    color: var(--text-primary);
}

.feature-check {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
    flex-shrink: 0;
    margin-top: 2px;
}

.btn-pricing {
    display: block;
    width: 100%;
    padding: 16px;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 16px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-pricing:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    box-shadow: var(--glow-cyan);
}

.btn-pricing-featured {
    background: var(--primary-color);
    color: var(--dark-bg);
    border-color: var(--primary-color);
}

.btn-pricing-featured:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.7);
}

/* Final CTA */
.final-cta {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--dark-card), var(--dark-bg)),
                radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
    text-align: center;
    position: relative;
    border-top: 1px solid var(--primary-color);
    border-bottom: 1px solid var(--primary-color);
}

.cta-content h2 {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-shadow: 0 0 30px rgba(6, 182, 212, 0.5);
}

.cta-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.btn-large {
    padding: 20px 48px;
    font-size: 20px;
    background: var(--primary-color);
    color: var(--dark-bg);
    font-weight: 700;
    box-shadow: var(--glow-cyan);
}

.btn-large:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.8), 0 8px 20px rgba(0, 0, 0, 0.4);
}

.cta-note {
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--dark-card);
    color: var(--text-primary);
    padding: 64px 0 32px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    text-shadow: var(--glow-cyan);
    font-family: 'Courier New', monospace;
}

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

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 12px;
    transition: all 0.2s;
}

.footer-column a:hover {
    color: var(--primary-color);
    text-shadow: var(--glow-cyan);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content,
    .solution-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-image {
        order: -1;
    }

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

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

    .process-timeline {
        flex-direction: column;
        gap: 48px;
    }

    .process-timeline::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        gap: 16px;
        font-size: 14px;
    }

    .nav-links a:not(.btn-primary-small) {
        display: none;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }

    .hero-trust {
        flex-direction: column;
        gap: 24px;
    }

    .problem-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

    .gallery-item {
        flex: 0 0 90%;
    }

    .gallery-nav {
        display: none;
    }

    .section-title {
        font-size: 32px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .cta-content h2 {
        font-size: 32px;
    }

    .cta-content p {
        font-size: 16px;
    }
}

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

    .nav-brand {
        font-size: 20px;
    }

    .hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .btn-primary,
    .btn-secondary {
        font-size: 16px;
        padding: 14px 24px;
    }
}