/* ================================================
   KYS ERP Demo Site — Premium Design System
   ================================================ */

/* === Design Tokens === */
:root {
    --bg-primary: #0B0F1A;
    --bg-secondary: #111827;
    --bg-card: #1A1F2E;
    --bg-card-hover: #242A3D;
    --surface: #1E2538;
    --border: rgba(255 255 255 / 0.06);
    --border-hover: rgba(255 255 255 / 0.12);

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --accent-blue: #3B82F6;
    --accent-purple: #8B5CF6;
    --accent-cyan: #06B6D4;
    --accent-green: #10B981;
    --accent-amber: #F59E0B;
    --accent-rose: #F43F5E;

    --gradient-main: linear-gradient(135deg, #3B82F6, #8B5CF6);
    --gradient-hero: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #06B6D4 100%);
    --gradient-card: linear-gradient(145deg, rgba(59, 130, 246, 0.08), rgba(139, 92, 246, 0.04));

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-sans: 'Inter', 'Noto Sans KR', -apple-system, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

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

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    backdrop-filter: blur(20px);
    background: rgba(11, 15, 26, 0.7);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(11, 15, 26, 0.95);
    border-bottom-color: var(--border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.25rem;
}

.logo-icon {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
}

.logo-text {
    color: var(--text-primary);
}

.logo-sub {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 0.9rem;
}

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

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: var(--transition);
}

.nav-links a:hover::after {
    transform: scaleX(1);
}

.nav-cta {
    background: var(--gradient-main) !important;
    color: white !important;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600 !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(59, 130, 246, 0.15), transparent 60%),
        radial-gradient(ellipse at 70% 80%, rgba(139, 92, 246, 0.1), transparent 60%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--accent-blue);
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 0.02em;
    animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.03em;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.8;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 64px;
    animation: fadeInUp 0.6s ease 0.3s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-md);
    padding: 12px 24px;
    transition: var(--transition);
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    box-shadow: 0 4px 24px rgba(59, 130, 246, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.35);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-hover);
}

.btn-outline {
    background: transparent;
    color: var(--accent-blue);
    border: 1px solid var(--accent-blue);
    width: 100%;
    justify-content: center;
    padding: 12px;
}

.btn-outline:hover {
    background: rgba(59, 130, 246, 0.1);
}

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

.btn-block {
    width: 100%;
    justify-content: center;
    padding: 14px;
    font-size: 1rem;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    animation: fadeInUp 0.6s ease 0.4s both;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-divider {
    width: 1px;
    background: var(--border);
    align-self: stretch;
}

/* === Sections === */
.section {
    padding: 100px 0;
    position: relative;
}

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

.section-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 540px;
    margin: 0 auto;
}

/* === Features === */
.features {
    background: var(--bg-secondary);
}

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

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

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

.feature-card.featured {
    background: var(--gradient-card);
    border-color: rgba(59, 130, 246, 0.2);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.feature-tag {
    display: inline-block;
    margin-top: 12px;
    background: rgba(16, 185, 129, 0.12);
    color: var(--accent-green);
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* === Modules === */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.module-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.module-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent, var(--accent-blue));
    transform: scaleX(0);
    transition: var(--transition);
}

.module-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-md);
}

.module-card:hover::after {
    transform: scaleX(1);
}

.module-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.module-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.module-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.module-stats {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* === Process Flow === */
.process {
    background: var(--bg-secondary);
}

.process-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.process-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    min-width: 160px;
    flex: 1;
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-4px);
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: var(--shadow-glow);
}

.process-num {
    font-size: 1.5rem;
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.process-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.process-content p {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.process-arrow {
    color: var(--accent-blue);
    font-size: 1.5rem;
    font-weight: 700;
    opacity: 0.5;
}

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

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

.price-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.price-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.price-card.popular {
    background: var(--gradient-card);
    border-color: rgba(59, 130, 246, 0.3);
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.price-card.popular:hover {
    transform: scale(1.05) translateY(-4px);
}

.price-popular-tag {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-main);
    color: white;
    padding: 4px 20px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
}

.price-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin-bottom: 4px;
}

.price-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.price-amount {
    margin-bottom: 4px;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 2px;
}

.price-currency {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.price-value {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.price-unit {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.price-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.price-features {
    text-align: left;
    margin-bottom: 28px;
}

.price-features li {
    padding: 8px 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

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

/* === Comparison === */
.comparison {
    background: var(--bg-secondary);
}

.comparison-table-wrap {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 16px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.comparison-table th {
    background: var(--surface);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.comparison-table td:first-child {
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-table .highlight {
    background: rgba(59, 130, 246, 0.06);
    color: var(--accent-blue);
    font-weight: 600;
}

.comparison-table th.highlight {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
}

/* === Blog === */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.blog-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.blog-thumb {
    height: 180px;
    display: flex;
    align-items: flex-end;
    padding: 16px;
}

.blog-category {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    color: white;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
}

.blog-body {
    padding: 24px;
}

.blog-body h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.5;
}

.blog-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.blog-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

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

.demo-info h2 {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.demo-info>p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 32px;
}

.demo-benefits li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.benefit-icon {
    font-size: 1.2rem;
}

.demo-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.demo-form h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.required {
    color: var(--accent-rose);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.form-notice {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 12px;
}

/* === Footer === */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 12px;
}

.footer-company {
    color: var(--text-muted) !important;
    font-size: 0.8rem !important;
    margin-top: 4px !important;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 4px 0;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

.footer-legal a {
    transition: var(--transition);
}

.footer-legal a:hover {
    color: var(--text-secondary);
}

/* === Animations === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

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

/* === Scroll Reveal === */
.feature-card,
.module-card,
.price-card,
.blog-card,
.process-step {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.feature-card.visible,
.module-card.visible,
.price-card.visible,
.blog-card.visible,
.process-step.visible {
    opacity: 1;
    transform: translateY(0);
}

.price-card.popular.visible {
    transform: scale(1.05);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .price-card.popular {
        transform: none;
    }

    .price-card.popular.visible {
        transform: none;
    }
}

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

    .mobile-menu {
        display: flex;
    }

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

    .hero-stats {
        gap: 20px;
        flex-wrap: wrap;
    }

    .stat-number {
        font-size: 1.8rem;
    }

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

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

    .demo-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .demo-info h2 {
        font-size: 1.8rem;
    }

    .process-flow {
        flex-direction: column;
    }

    .process-arrow {
        transform: rotate(90deg);
    }

    .footer-top {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        font-size: 0.8rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 10px 12px;
    }
}