:root {
    --bg: #000;
    --bg-alt: #080808;
    --card: #111;
    --card-border: #1a1a1a;
    --text: #fff;
    --muted: #999;
    --accent: #c8ff00;
    --accent-hover: #b5e600;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ===== HEADER ===== */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 40px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: background 0.3s, border-color 0.3s;
}

.top-bar.scrolled {
    background: rgba(0, 0, 0, 0.9);
    border-bottom: 1px solid #222;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand .logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: cover;
}

.brand-name {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-links a {
    color: var(--muted);
    margin-left: 32px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    flex-direction: column;
    gap: 5px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== HERO ===== */
.hero {
    padding: 160px 20px 100px;
    text-align: center;
    background: radial-gradient(ellipse at 50% 0%, rgba(200, 255, 0, 0.06) 0%, transparent 60%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 24px;
    padding: 8px 20px;
    border: 1px solid rgba(200, 255, 0, 0.2);
    border-radius: 50px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--accent), #a0d900);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--muted);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.primary-btn {
    display: inline-block;
    background: var(--accent);
    color: #000;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: background 0.2s, transform 0.2s;
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.secondary-btn {
    display: inline-block;
    color: var(--text);
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    border: 1px solid #333;
    transition: border-color 0.2s, background 0.2s;
}

.secondary-btn:hover {
    border-color: #555;
    background: rgba(255, 255, 255, 0.05);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.hero-stats .stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-stats .stat strong {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent);
}

.hero-stats .stat span {
    font-size: 13px;
    color: var(--muted);
    margin-top: 4px;
}

/* ===== SECTION TITLES ===== */
.section-title {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--muted);
    margin-bottom: 48px;
}

/* ===== FEATURES ===== */
.features-section {
    padding: 100px 20px;
    text-align: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.feature-card {
    background: var(--card);
    border: 1px solid var(--card-border);
    padding: 0;
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s, border-color 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: #333;
}

.feature-img-wrap {
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.feature-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}

.feature-card:hover .feature-img-wrap img {
    transform: scale(1.05);
}

.feature-card h3 {
    padding: 24px 24px 0;
    font-size: 20px;
    font-weight: 700;
}

.feature-card > p {
    padding: 12px 24px 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
    padding: 16px 24px 24px;
}

.feature-list li {
    padding: 6px 0;
    font-size: 14px;
    color: var(--muted);
    position: relative;
    padding-left: 20px;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* ===== ABOUT ===== */
.about-section {
    padding: 100px 20px;
    background: var(--bg-alt);
}

.about-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
}

.about-text p {
    color: var(--muted);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-text .primary-btn {
    margin-top: 12px;
}

.about-img img {
    width: 100%;
    border-radius: 16px;
    object-fit: cover;
    max-height: 400px;
}

/* ===== EXCHANGE / SECURITY ===== */
.exchange-section {
    padding: 100px 20px;
}

.exchange-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.exchange-img img {
    width: 100%;
    border-radius: 16px;
    object-fit: cover;
    max-height: 500px;
}

.exchange-text .section-title {
    text-align: left;
}

.exchange-intro {
    color: var(--muted);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 28px;
}

.check-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.check-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    background: rgba(200, 255, 0, 0.15);
    color: var(--accent);
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    margin-top: 2px;
}

.check-item span:last-child {
    color: var(--muted);
    font-size: 15px;
    line-height: 1.6;
}

.exchange-tagline {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    font-style: italic;
}

/* ===== CTA SECTION ===== */
.cta-section {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(135deg, rgba(200, 255, 0, 0.08) 0%, rgba(200, 255, 0, 0.02) 100%);
    border-top: 1px solid var(--card-border);
    border-bottom: 1px solid var(--card-border);
}

.cta-section h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
}

.cta-section p {
    color: var(--muted);
    font-size: 16px;
    margin-bottom: 32px;
}

/* ===== CONTACT ===== */
.contact-section {
    padding: 100px 20px;
    text-align: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.contact-card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 40px 24px;
    transition: border-color 0.3s;
}

.contact-card:hover {
    border-color: #333;
}

.contact-icon {
    font-size: 28px;
    margin-bottom: 16px;
    color: var(--accent);
}

.contact-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-card a {
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.contact-card a:hover {
    color: var(--accent);
}

/* ===== FOOTER ===== */
footer {
    border-top: 1px solid #1a1a1a;
    padding: 40px 20px;
    text-align: center;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-brand {
    font-size: 18px;
    font-weight: 700;
    display: block;
    margin-bottom: 8px;
}

footer p {
    font-size: 13px;
    color: #555;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .features-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .about-container,
    .exchange-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-text .section-title,
    .exchange-text .section-title {
        text-align: center;
    }

    .about-text,
    .exchange-text {
        text-align: center;
    }

    .about-text .primary-btn {
        display: inline-block;
    }

    .exchange-img {
        order: -1;
    }

    .check-list {
        text-align: left;
    }

    .hero h1 {
        font-size: 36px;
    }

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

@media (max-width: 768px) {
    .top-bar {
        padding: 14px 20px;
    }

    .brand .logo {
        width: 34px;
        height: 34px;
    }

    .brand-name {
        font-size: 18px;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: #0a0a0a;
        display: flex;
        flex-direction: column;
        padding: 80px 32px 32px;
        transition: right 0.3s;
        border-left: 1px solid #222;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links a {
        margin-left: 0;
        padding: 14px 0;
        font-size: 16px;
        border-bottom: 1px solid #1a1a1a;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 130px 20px 70px;
    }

    .hero h1 {
        font-size: 30px;
    }

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

    .hero-stats {
        gap: 30px;
    }

    .hero-stats .stat strong {
        font-size: 22px;
    }

    .features-section,
    .about-section,
    .exchange-section,
    .contact-section {
        padding: 60px 20px;
    }

    .cta-section {
        padding: 60px 20px;
    }

    .cta-section h2 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 26px;
    }

    .hero-tag {
        font-size: 11px;
        padding: 6px 14px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
}