*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161f;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b8;
    --accent: #6c5ce7;
    --accent-light: #a29bfe;
    --accent-glow: rgba(108, 92, 231, 0.3);
    --gradient-1: linear-gradient(135deg, #6c5ce7 0%, #00cec9 100%);
    --gradient-2: linear-gradient(135deg, #fd79a8 0%, #6c5ce7 100%);
    --gradient-3: linear-gradient(135deg, #00cec9 0%, #0984e3 100%);
    --border: rgba(255,255,255,0.06);
    --radius: 16px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ─── Language Toggle ─── */
.lang-toggle {
    display: flex;
    gap: 4px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 3px;
    margin-left: 16px;
}
.lang-btn {
    padding: 6px 14px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 7px;
    cursor: pointer;
    transition: all 0.3s;
}
.lang-btn.active {
    background: var(--accent);
    color: #fff;
}

/* ─── Navigation ─── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    padding: 16px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.logo {
    display: flex;
    align-items: center;
    line-height: 1;
}
.logo-link {
    display: block;
    line-height: 0;
}
.logo-img {
    display: block;
    height: 42px;
    width: auto;
    filter: invert(1) hue-rotate(180deg);
}
/* ─── Hero Logo ─── */
.hero-logo-wrap {
    margin-bottom: 36px;
    position: relative;
    z-index: 1;
}
.hero-logo-img {
    height: 130px;
    width: auto;
    filter: invert(1) hue-rotate(180deg);
}
.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta {
    padding: 10px 24px;
    background: var(--gradient-1);
    color: #fff !important;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.3s;
}
.nav-cta:hover { opacity: 0.9; }

/* ─── Hero ─── */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(108, 92, 231, 0.1);
    border: 1px solid rgba(108, 92, 231, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 32px;
    position: relative;
    z-index: 1;
}
.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: #00cec9;
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.hero h1 {
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -2px;
    margin-bottom: 24px;
    max-width: 900px;
    position: relative;
    z-index: 1;
}
.hero h1 .gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
    line-height: 1.7;
}
.hero-buttons {
    display: flex;
    gap: 16px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
    justify-content: center;
}
.btn-primary {
    padding: 16px 36px;
    background: var(--gradient-1);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); }
.btn-secondary {
    padding: 16px 36px;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-secondary:hover { border-color: rgba(255,255,255,0.3); background: rgba(255,255,255,0.05); }

/* ─── Floating Stats Bar ─── */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: 48px;
    padding: 48px 24px;
    margin-top: -20px;
    position: relative;
    z-index: 2;
    flex-wrap: wrap;
}
.stat-item {
    text-align: center;
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ─── Sections ─── */
section {
    padding: 100px 24px;
    max-width: 1200px;
    margin: 0 auto;
}
.section-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent-light);
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.15;
    margin-bottom: 20px;
}
.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 640px;
    line-height: 1.7;
}

/* ─── Korea Heritage ─── */
.korea-section {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 64px;
    margin: 0 auto 80px;
    max-width: 1200px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.korea-section::after {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(108,92,231,0.08) 0%, transparent 70%);
    pointer-events: none;
}
.korea-content { position: relative; z-index: 1; }
.korea-content .section-title { margin-bottom: 24px; }
.korea-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 16px; }
.korea-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 32px;
}
.korea-stat {
    background: rgba(108, 92, 231, 0.06);
    border: 1px solid rgba(108, 92, 231, 0.15);
    border-radius: 12px;
    padding: 20px;
}
.korea-stat .number {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent-light);
}
.korea-stat .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
}
.korea-visual {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.korea-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}
.korea-card .icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}
.korea-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.korea-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }

/* ─── Features Grid ─── */
.features-header {
    text-align: center;
    margin-bottom: 64px;
}
.features-header .section-desc {
    margin: 0 auto;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}
.feature-card:hover {
    border-color: rgba(108, 92, 231, 0.3);
    transform: translateY(-4px);
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    opacity: 0;
    transition: opacity 0.4s;
}
.feature-card:nth-child(1)::before { background: var(--gradient-1); }
.feature-card:nth-child(2)::before { background: var(--gradient-2); }
.feature-card:nth-child(3)::before { background: var(--gradient-3); }
.feature-card:nth-child(4)::before { background: var(--gradient-2); }
.feature-card:nth-child(5)::before { background: var(--gradient-1); }
.feature-card:nth-child(6)::before { background: var(--gradient-3); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}
.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ─── Industries ─── */
.industries-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 48px;
}
.industry-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s;
}
.industry-card:hover {
    border-color: rgba(108,92,231,0.3);
    transform: translateY(-4px);
}
.industry-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}
.industry-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.industry-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ─── How it Works ─── */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-top: 64px;
}
.step {
    position: relative;
    text-align: center;
}
.step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    background: var(--gradient-1);
    color: #fff;
}
.step h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ─── CTA / Contact ─── */
.cta-section {
    text-align: center;
    padding: 100px 24px;
    position: relative;
}
.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}
.cta-section .section-title {
    max-width: 700px;
    margin: 0 auto 20px;
}
.cta-section .section-desc {
    margin: 0 auto 40px;
}
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    max-width: 960px;
    margin: 0 auto;
    text-align: left;
    position: relative;
    z-index: 1;
}
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    border-color: var(--accent);
}
.contact-form select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    cursor: pointer;
}
.contact-form select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}
.contact-form textarea {
    resize: vertical;
    min-height: 110px;
}
.contact-form .btn-primary {
    width: 100%;
    justify-content: center;
    border: none;
    cursor: pointer;
}
.form-success {
    display: none;
    text-align: center;
    padding: 40px;
    background: rgba(0, 206, 201, 0.08);
    border: 1px solid rgba(0, 206, 201, 0.25);
    border-radius: 12px;
}
.form-success .check {
    font-size: 3rem;
    margin-bottom: 16px;
}
.form-success h3 { font-size: 1.3rem; margin-bottom: 8px; }
.form-success p { color: var(--text-secondary); font-size: 0.95rem; }
.contact-info-side {
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding-top: 8px;
}
.contact-info-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}
.contact-info-item .ci-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(108, 92, 231, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}
.contact-info-item h4 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
}
.contact-info-item p,
.contact-info-item a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    text-decoration: none;
    transition: color 0.3s;
}
.contact-info-item a:hover { color: var(--accent-light); }
.social-links {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}
.social-link {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    transition: all 0.3s;
}
.social-link:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background: rgba(108, 92, 231, 0.08);
}
@media (max-width: 768px) {
    .contact-wrapper { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}

/* ─── Footer ─── */
footer {
    border-top: 1px solid var(--border);
    padding: 64px 24px 32px;
    max-width: 1200px;
    margin: 0 auto;
}
.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 320px;
}
.footer-col h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.footer-col a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color 0.3s;
}
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.footer-flags { display: flex; gap: 12px; font-size: 1.2rem; }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
    .korea-section { grid-template-columns: 1fr; padding: 40px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .industries-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

/* ─── Hamburger ─── */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
    nav { padding: 12px 20px; }
    .hamburger { display: flex; }
    .nav-links {
        display: none;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(10, 10, 15, 0.97);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 1000;
        font-size: 1.2rem;
    }
    .nav-links.open { display: flex; }
    .nav-links li { list-style: none; }
    .nav-links a { font-size: 1.2rem; }
    .lang-toggle { margin-top: 8px; }
    .features-grid { grid-template-columns: 1fr; }
    .industries-grid { grid-template-columns: 1fr 1fr; }
    .steps { grid-template-columns: 1fr; }
    .stats-bar { gap: 32px; }
    .footer-top { grid-template-columns: 1fr; }
    .hero h1 { letter-spacing: -1px; }
    .korea-section { padding: 32px 24px; }
    .korea-stats { grid-template-columns: 1fr; }
}

/* ─── Animations ─── */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── Language visibility (symmetric) ─── */
body:not(.lang-vi) .vi { display: none; }
body.lang-vi .en { display: none; }
body.lang-vi .vi { display: inline; }

/* ─── Screen reader only ─── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* ─── Skip to content ─── */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--accent);
    color: #fff;
    padding: 8px 16px;
    font-size: 0.9rem;
    z-index: 9999;
    text-decoration: none;
    border-radius: 0 0 8px 0;
}
.skip-link:focus { top: 0; }