.platform-header {
    position: sticky;
    top: 0;
    z-index: 1200;
    padding: 12px clamp(12px, 2.2vw, 24px) 0;
}

.platform-header-inner {
    width: min(1500px, 100%);
    margin: 0 auto;
    border: 1px solid rgba(0, 255, 255, 0.14);
    border-radius: 20px;
    background:
        linear-gradient(135deg, rgba(4, 10, 18, 0.95), rgba(6, 14, 26, 0.82)),
        rgba(5, 8, 14, 0.92);
    box-shadow:
        0 18px 46px rgba(0, 0, 0, 0.32),
        inset 0 1px 0 rgba(255, 255, 255, 0.04),
        0 0 22px rgba(0, 255, 255, 0.06);
    backdrop-filter: blur(16px);
}

body.scrolled .platform-header-inner {
    border-color: rgba(0, 255, 255, 0.22);
    box-shadow:
        0 22px 56px rgba(0, 0, 0, 0.38),
        0 0 28px rgba(0, 255, 255, 0.08);
}

.platform-header-compact {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 18px;
    padding: 10px 16px;
}

.brand-lockup {
    display: flex;
    flex-direction: column;
    min-width: 0;
    text-decoration: none;
    color: inherit;
}

.brand-lockup-compact {
    gap: 2px;
    padding: 4px 6px 4px 0;
}

.brand-name {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1rem, 1.12vw, 1.2rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--tron-cyan);
    text-shadow: 0 0 14px rgba(0, 255, 255, 0.18);
}

.brand-kicker {
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(196, 225, 255, 0.62);
}

.platform-nav-panel {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    min-width: 0;
    flex-wrap: wrap;
}

.platform-nav-panel-compact {
    padding-left: 4px;
}

.nav-strip {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    min-width: 0;
}

.nav-strip-ecosystem .nav-link {
    font-size: 0.83rem;
}

.nav-divider {
    width: 1px;
    align-self: stretch;
    background: linear-gradient(180deg, transparent, rgba(125, 249, 255, 0.24), transparent);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 34px;
    padding: 7px 12px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.02);
    color: rgba(232, 240, 250, 0.9);
    text-decoration: none;
    font-weight: 640;
    font-size: 0.88rem;
    line-height: 1;
    letter-spacing: 0.01em;
    white-space: nowrap;
    transition:
        transform 160ms ease,
        border-color 160ms ease,
        background 160ms ease,
        color 160ms ease,
        box-shadow 160ms ease;
}

.nav-link:hover {
    transform: translateY(-1px);
    color: #f7fcff;
    border-color: rgba(0, 255, 255, 0.26);
    background: rgba(0, 255, 255, 0.07);
    box-shadow: 0 0 14px rgba(0, 255, 255, 0.07);
}

.nav-link.active {
    color: #07131c;
    border-color: rgba(0, 255, 255, 0.52);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.92), rgba(120, 248, 255, 0.72));
    box-shadow: 0 0 18px rgba(0, 255, 255, 0.16);
}

.nav-link-utility {
    margin-left: 2px;
}

.ecosystem-link {
    color: rgba(228, 236, 246, 0.88);
}

.ecosystem-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex: 0 0 auto;
    box-shadow: 0 0 12px currentColor;
}

.ecosystem-cyan .ecosystem-dot { background: #67efff; }
.ecosystem-gold .ecosystem-dot { background: #ffd978; }
.ecosystem-rose .ecosystem-dot { background: #ff8db2; }
.ecosystem-mint .ecosystem-dot { background: #8df2c4; }

.platform-nav-toggle {
    display: none;
    justify-self: end;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.platform-nav-toggle:hover {
    border-color: rgba(0, 255, 255, 0.24);
    box-shadow: 0 0 16px rgba(0, 255, 255, 0.08);
}

.platform-nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 4px auto;
    border-radius: 999px;
    background: var(--tron-cyan);
}

@media (max-width: 1180px) {
    .platform-header-compact {
        grid-template-columns: 1fr auto;
    }

    .platform-nav-panel {
        grid-column: 1 / -1;
        justify-content: flex-start;
        padding-top: 2px;
    }
}

@media (max-width: 980px) {
    .platform-header {
        padding-top: 10px;
    }

    .platform-header-compact {
        gap: 12px;
        padding: 10px 12px;
    }

    .platform-nav-toggle {
        display: block;
    }

    .platform-nav-panel {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        width: 100%;
        padding-top: 6px;
    }

    .platform-nav-panel.nav-open {
        display: flex;
    }

    .nav-strip {
        width: 100%;
        justify-content: flex-start;
    }

    .nav-divider {
        display: none;
    }

    .nav-link,
    .nav-link-utility {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 640px) {
    .platform-header {
        padding-inline: 10px;
    }

    .platform-header-inner {
        border-radius: 18px;
    }

    .brand-name {
        font-size: 0.96rem;
    }

    .brand-kicker {
        font-size: 0.64rem;
        letter-spacing: 0.14em;
    }
}