:root {
    --usd-ink: #141a14;
    --usd-field: #dfe8dc;
    --usd-paper: #f3f7f0;
    --usd-moss: #1f5c3a;
    --usd-moss-deep: #123526;
    --usd-rust: #9a4a1c;
    --usd-mute: #4d5a4d;
    --usd-line: rgba(20, 26, 20, 0.14);
    --usd-font-display: "Bricolage Grotesque", "Segoe UI", sans-serif;
    --usd-font-body: "Source Serif 4", Georgia, serif;
}

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

html {
    scroll-behavior: smooth;
}

body.usd-page {
    margin: 0;
    color: var(--usd-ink);
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(31, 92, 58, 0.12), transparent 55%),
        radial-gradient(900px 500px at 100% 20%, rgba(154, 74, 28, 0.08), transparent 50%),
        linear-gradient(180deg, var(--usd-paper), var(--usd-field) 48%, #cfd9c8);
    font-family: var(--usd-font-body);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
}

.usd-wrap {
    width: min(1100px, calc(100% - 2.5rem));
    margin-inline: auto;
}

.usd-nav {
    position: absolute;
    z-index: 5;
    inset: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    width: min(1100px, calc(100% - 2.5rem));
    margin: 1.1rem auto 0;
}

.usd-nav__brand {
    font-family: var(--usd-font-display);
    font-weight: 800;
    font-size: clamp(1rem, 2vw, 1.15rem);
    letter-spacing: -0.02em;
    text-decoration: none;
    color: #f5f8f2;
    text-shadow: 0 1px 12px rgba(0, 0, 0, 0.35);
}

.usd-nav__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.85rem 1.15rem;
    font-family: var(--usd-font-display);
    font-size: 0.92rem;
    font-weight: 600;
}

.usd-nav__links a {
    text-decoration: none;
    color: rgba(245, 248, 242, 0.92);
}

.usd-nav__login {
    padding-bottom: 0.1rem;
    border-bottom: 1px solid rgba(245, 248, 242, 0.55);
}

.usd-hero {
    position: relative;
    min-height: 100svh;
    display: grid;
    align-items: end;
    overflow: hidden;
    color: #f5f8f2;
}

.usd-hero__media {
    position: absolute;
    inset: 0;
}

.usd-hero__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.04);
}

.usd-hero__veil {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(10, 18, 12, 0.45) 0%, rgba(10, 18, 12, 0.18) 38%, rgba(10, 18, 12, 0.78) 100%),
        linear-gradient(90deg, rgba(18, 53, 38, 0.55), transparent 55%);
}

.usd-hero__content {
    position: relative;
    z-index: 2;
    width: min(1100px, calc(100% - 2.5rem));
    margin: 0 auto 4.5rem;
    padding-top: 6rem;
}

.usd-hero__brand {
    margin: 0 0 0.85rem;
    font-family: var(--usd-font-display);
    font-size: clamp(2.4rem, 7vw, 5.2rem);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
    max-width: 12ch;
}

.usd-hero__title {
    margin: 0 0 0.85rem;
    max-width: 16ch;
    font-family: var(--usd-font-display);
    font-size: clamp(1.35rem, 3.2vw, 2rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.usd-hero__lede {
    margin: 0 0 1.6rem;
    max-width: 34ch;
    font-size: clamp(1.05rem, 2vw, 1.2rem);
    color: rgba(245, 248, 242, 0.9);
}

.usd-hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.usd-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.85rem;
    padding: 0.7rem 1.2rem;
    border: 1px solid transparent;
    border-radius: 0.35rem;
    font-family: var(--usd-font-display);
    font-size: 0.98rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    text-decoration: none;
    transition: transform 160ms ease, background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.usd-btn--primary {
    background: #e9f2e4;
    color: var(--usd-moss-deep);
}

.usd-btn--primary:hover {
    background: #fff;
}

.usd-btn--ghost {
    border-color: rgba(245, 248, 242, 0.55);
    color: #f5f8f2;
    background: transparent;
}

.usd-btn--ghost:hover {
    background: rgba(245, 248, 242, 0.1);
}

.usd-section {
    padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.usd-section__title {
    margin: 0 0 0.65rem;
    font-family: var(--usd-font-display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.usd-section__lede {
    margin: 0 0 2rem;
    max-width: 38ch;
    color: var(--usd-mute);
    font-size: 1.12rem;
}

.usd-materials {
    background:
        linear-gradient(180deg, rgba(243, 247, 240, 0.92), rgba(223, 232, 220, 0.95));
}

.usd-materials__list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--usd-line);
}

.usd-materials__list li {
    display: grid;
    grid-template-columns: minmax(8rem, 0.45fr) 1fr;
    gap: 0.75rem 1.5rem;
    padding: 1.15rem 0;
    border-bottom: 1px solid var(--usd-line);
}

.usd-materials__name {
    font-family: var(--usd-font-display);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--usd-moss-deep);
}

.usd-materials__desc {
    color: var(--usd-mute);
}

.usd-trade__grid {
    display: grid;
    gap: 2rem;
}

.usd-steps {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: usd-step;
}

.usd-steps li {
    position: relative;
    padding: 1rem 0 1rem 3rem;
    border-top: 1px solid var(--usd-line);
    counter-increment: usd-step;
}

.usd-steps li:last-child {
    border-bottom: 1px solid var(--usd-line);
}

.usd-steps li::before {
    content: counter(usd-step);
    position: absolute;
    left: 0;
    top: 1rem;
    width: 2rem;
    height: 2rem;
    display: grid;
    place-items: center;
    border-radius: 0.3rem;
    background: var(--usd-moss);
    color: #f3f7f0;
    font-family: var(--usd-font-display);
    font-weight: 700;
    font-size: 0.95rem;
}

.usd-steps strong {
    font-family: var(--usd-font-display);
    font-weight: 700;
}

.usd-contact {
    background:
        linear-gradient(135deg, var(--usd-moss-deep), #1a4a32 55%, #2a5d3f);
    color: #f3f7f0;
}

.usd-contact .usd-section__lede {
    color: rgba(243, 247, 240, 0.82);
}

.usd-contact__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.usd-contact .usd-btn--primary {
    background: #f3f7f0;
    color: var(--usd-moss-deep);
}

.usd-contact .usd-btn--ghost {
    border-color: rgba(243, 247, 240, 0.45);
    color: #f3f7f0;
}

.usd-footer {
    padding: 1.5rem 0 2rem;
    background: #101610;
    color: rgba(243, 247, 240, 0.72);
}

.usd-footer__row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem 1rem;
}

.usd-footer__brand {
    margin: 0;
    font-family: var(--usd-font-display);
    font-weight: 700;
    color: #f3f7f0;
}

.usd-footer__meta {
    margin: 0;
    font-size: 0.92rem;
}

/* Motion */
.usd-motion .usd-hero__media img {
    animation: usd-drift 18s ease-in-out infinite alternate;
}

.usd-motion .usd-hero__brand,
.usd-motion .usd-hero__title,
.usd-motion .usd-hero__lede,
.usd-motion .usd-hero__actions {
    opacity: 0;
    transform: translateY(18px);
    animation: usd-rise 0.85s ease forwards;
}

.usd-motion .usd-hero__title { animation-delay: 0.12s; }
.usd-motion .usd-hero__lede { animation-delay: 0.22s; }
.usd-motion .usd-hero__actions { animation-delay: 0.34s; }

.usd-motion .usd-section,
.usd-motion .usd-materials__list li,
.usd-motion .usd-steps li {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.usd-motion .usd-section.is-in,
.usd-motion .usd-materials__list li.is-in,
.usd-motion .usd-steps li.is-in {
    opacity: 1;
    transform: none;
}

.usd-motion .usd-materials__list li:nth-child(2).is-in { transition-delay: 0.06s; }
.usd-motion .usd-materials__list li:nth-child(3).is-in { transition-delay: 0.12s; }
.usd-motion .usd-materials__list li:nth-child(4).is-in { transition-delay: 0.18s; }

@keyframes usd-rise {
    to {
        opacity: 1;
        transform: none;
    }
}

@keyframes usd-drift {
    from { transform: scale(1.04) translate3d(0, 0, 0); }
    to { transform: scale(1.1) translate3d(-1.5%, -1%, 0); }
}

@media (min-width: 820px) {
    .usd-trade__grid {
        grid-template-columns: 0.95fr 1.05fr;
        align-items: start;
        gap: 3rem;
    }
}

@media (max-width: 720px) {
    .usd-nav__links a:not(.usd-nav__login) {
        display: none;
    }

    .usd-materials__list li {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .usd-hero__content {
        margin-bottom: 3rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}