:root {
    --tg-bg: #05070a;
    --tg-surface: #090d12;
    --tg-surface-2: #0d131a;
    --tg-line: #202a34;
    --tg-text: #f1f4f6;
    --tg-muted: #84919d;
    --tg-yellow: #ffd400;
    --tg-cyan: #00d9ff;
}

body.dt-page > header.dt-header,
body.cal-page > header.dt-header,
body.grupa-page > header.dt-header,
body.bw-page > header.dt-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--tg-bg);
    border-bottom: 1px solid var(--tg-line);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    box-shadow: none;
    padding: 0;
    margin-bottom: 0;
}

.dt-header-inner {
    width: min(1460px, 97vw);
    margin: 0 auto;
    height: var(--dt-header-h, 73px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.dt-brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
    text-decoration: none;
}

.dt-brand-mark {
    width: 36px;
    height: 36px;
    border: 1px solid var(--tg-yellow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.86rem;
    font-weight: 900;
    letter-spacing: 0.5px;
    color: var(--tg-yellow);
    background: transparent;
}

.dt-brand-text {
    font-size: 0.86rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--tg-text);
    line-height: 1.15;
}

.dt-nav {
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.dt-nav-toggle {
    display: none;
    border: 1px solid var(--tg-line);
    background: var(--tg-surface);
    width: 40px;
    height: 36px;
    padding: 7px;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

.dt-nav-toggle span {
    display: block;
    width: 100%;
    height: 1px;
    background: var(--tg-text);
}

.dt-nav a {
    text-decoration: none;
    color: var(--tg-muted);
    font: 700 10px/1 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 8px 14px;
    border-left: 2px solid transparent;
    transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.dt-nav a:hover {
    color: var(--tg-text);
    background: var(--tg-surface);
}

.dt-nav a.is-active {
    color: var(--tg-text);
    background: var(--tg-surface);
    border-left-color: var(--tg-yellow);
}

@media (max-width: 1120px) {
    .dt-brand-mark {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }

    .dt-brand-text {
        font-size: 0.8rem;
    }

    .dt-nav a {
        font-size: 9px;
        padding: 8px 10px;
    }
}

@media (max-width: 768px) {
    .dt-header-inner {
        width: min(1460px, calc(100vw - 16px));
        height: auto;
        align-items: center;
        gap: 8px;
        padding: 10px 0;
        position: relative;
    }

    .dt-brand {
        min-width: 0;
        gap: 8px;
    }

    .dt-brand-mark {
        width: 30px;
        height: 30px;
    }

    .dt-brand-text {
        font-size: 0.76rem;
        line-height: 1.15;
        overflow-wrap: anywhere;
        max-width: 130px;
    }

    .dt-nav-toggle {
        display: inline-flex;
        margin-left: auto;
        flex-direction: column;
        flex-shrink: 0;
    }

    .dt-nav {
        position: absolute;
        top: 100%;
        right: 0;
        display: none;
        flex-direction: column;
        gap: 0;
        min-width: 190px;
        background: var(--tg-bg);
        border: 1px solid var(--tg-line);
        border-top: 0;
        z-index: 40;
    }

    .dt-nav.is-open {
        display: flex;
    }

    .dt-nav a {
        font-size: 9px;
        padding: 12px 14px;
    }
}

@media (max-width: 480px) {
    .dt-brand-text {
        max-width: 132px;
    }
}