:root {
    /* Precise Binance-inspired yet UI/UX friendly Palette */
    --binance-yellow: #FCD535;
    --binance-yellow-hover: #EABF10;
    --dark-bg: #0B0E11;
    --dark-surface: #1E2329;
    --dark-secondary: #2B3139;
    --border-color: #383E45;
    --text-white: #EAECEF;
    --text-gray: #929AA5;
    --success-green: #0ECB81;
    --error-red: #F6465D;

    --container-max: 1200px;
    --transition-fast: all 0.2s ease;
}

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

body {
    background-color: var(--dark-bg);
    color: var(--text-white);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography Refresh */
h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -1px;
}

h2 {
    font-size: 2.25rem;
    font-weight: 700;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

/* Buttons & Interactive */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.9rem;
    border: none;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    font-family: inherit;
}

.btn-yellow {
    background-color: var(--binance-yellow);
    color: #000;
}

.btn-yellow:hover {
    background-color: var(--binance-yellow-hover);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-white);
}

.btn-ghost:hover {
    background-color: var(--dark-surface);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-white);
}

.btn-outline:hover {
    border-color: var(--binance-yellow);
}

.btn-full {
    width: 100%;
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Header & Nav */
header {
    height: 72px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--dark-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-square {
    background-color: var(--binance-yellow);
    color: #000;
    padding: 6px 8px;
    border-radius: 4px;
    font-weight: 800;
    font-size: 1.1rem;
}

.logo-text {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-white);
}

.logo-text span {
    color: var(--binance-yellow);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-white);
    font-size: 0.95rem;
    font-weight: 500;
}

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

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

/* Hero Section - TetherMax Style */
.hero {
    padding: 100px 0;
    text-align: center;
}

.hero-main h1 span {
    color: var(--binance-yellow);
}

.hero-main p {
    max-width: 650px;
    margin: 1.5rem auto 3rem;
    font-size: 1.15rem;
}

.trust-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--dark-secondary);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    margin-top: 3rem;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.trust-pill i {
    color: var(--success-green);
    width: 18px;
}

/* Exchanges Grid */
.exchanges-section {
    padding: 80px 0;
    background-color: #0d1116;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    margin-bottom: 0.5rem;
}

.exchange-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.exchange-card {
    background-color: var(--dark-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition-fast);
}

.exchange-card:hover {
    transform: translateY(-5px);
    border-color: var(--binance-yellow);
}

.exchange-card.featured {
    border-color: var(--binance-yellow);
    background-color: #24292f;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.rank {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--binance-yellow);
    background: rgba(252, 213, 53, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.exchange-logo {
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: 1px;
}

.rate-box {
    text-align: center;
    padding: 1.5rem;
    background: var(--dark-secondary);
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.rate-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-gray);
}

.rate-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--binance-yellow);
}

.card-features {
    list-style: none;
    margin-bottom: 2rem;
}

.card-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    color: var(--text-white);
}

.card-features i {
    width: 18px;
    color: var(--text-gray);
}

/* Calculator Styling */
.calculator-section {
    padding: 80px 0;
}

.calculator-box {
    background: var(--dark-surface);
    border-radius: 24px;
    padding: 4rem;
    border: 1px solid var(--border-color);
}

.calc-header {
    text-align: center;
    margin-bottom: 3rem;
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 0.5rem;
}

.input-group select,
.input-group input[type="number"] {
    width: 100%;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: 8px;
    color: var(--text-white);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}

.input-group select:focus,
.input-group input:focus {
    border-color: var(--binance-yellow);
}

.input-group input[type="range"] {
    width: 100%;
    margin: 1rem 0;
}

.range-val {
    text-align: right;
    font-weight: 700;
    color: var(--binance-yellow);
}

.result-card {
    background: var(--dark-secondary);
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.result-card span {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin-bottom: 1rem;
    display: block;
}

.result-card h3 {
    font-size: 3rem;
    color: var(--binance-yellow);
    margin-bottom: 1.5rem;
}

.result-card p {
    font-size: 0.8rem;
    margin-bottom: 2rem;
}

/* Service Intro ... */
.service-intro {
    padding: 100px 0;
}

.intro-box {
    background-color: var(--dark-surface);
    border-radius: 24px;
    padding: 4rem 2rem;
    border: 1px solid var(--border-color);
}

.intro-header {
    text-align: center;
    margin-bottom: 4rem;
}

.flow-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.flow-item {
    text-align: center;
    width: 140px;
}

.flow-icon {
    width: 64px;
    height: 64px;
    background: var(--dark-secondary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    border: 1px solid var(--border-color);
}

.flow-icon i {
    width: 32px;
    height: 32px;
}

.flow-item span {
    font-weight: 700;
    display: block;
    margin-bottom: 0.25rem;
}

.flow-item p {
    font-size: 0.8rem;
    line-height: 1.2;
}

.flow-item.highlight .flow-icon {
    background-color: var(--binance-yellow);
    color: #000;
}

.flow-item.success .flow-icon {
    border-color: var(--success-green);
    color: var(--success-green);
}

.flow-arrow i {
    color: var(--border-color);
}

/* Benefits Section */
.benefits {
    padding: 80px 0;
}

.benefit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
}

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

.benefit-icon {
    width: 56px;
    height: 56px;
    background: rgba(252, 213, 53, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--binance-yellow);
}

.benefit-item h3 {
    margin-bottom: 1rem;
}

/* Final CTA Section */
.final-cta {
    padding: 100px 0;
}

.cta-content {
    background: linear-gradient(135deg, var(--binance-yellow) 0%, #ffdf5e 100%);
    border-radius: 24px;
    padding: 5rem 2rem;
    text-align: center;
    color: #000;
}

.cta-content h2 {
    color: #000;
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(0, 0, 0, 0.7);
    font-weight: 500;
    font-size: 1.25rem;
    margin-bottom: 3rem;
}

/* Footer */
footer {
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand p {
    margin-top: 1.5rem;
    max-width: 320px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.link-group a {
    display: block;
    color: var(--text-gray);
    text-decoration: none;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.link-group a:hover {
    color: var(--binance-yellow);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    text-align: center;
    color: var(--text-gray);
    font-size: 0.85rem;
}

/* Responsive Tweaks */
@media (max-width: 992px) {
    h1 {
        font-size: 2.75rem;
    }

    .footer-top {
        grid-template-columns: 1fr;
    }

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

    .flow-arrow {
        display: none;
    }

    .flow-container {
        gap: 3rem;
    }
}

@media (max-width: 600px) {
    .nav-links {
        display: none;
    }

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

    .cta-content h2 {
        font-size: 2rem;
    }
}