.antenna-sheet {
    --sheet-accent: #0f9f8d;
    --sheet-accent-dark: #087f72;
    --sheet-blue: #2563eb;
    --sheet-amber: #b45309;
    --sheet-red: #b91c1c;
    --sheet-border: rgba(128, 128, 128, 0.24);
    --sheet-soft: rgba(15, 159, 141, 0.10);
    padding-top: 1.4rem;
    padding-bottom: 3rem;
}

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

.sheet-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-bottom: 1rem;
    font-size: 0.86rem;
    opacity: 0.72;
}

.sheet-breadcrumb a {
    color: inherit;
}

.sheet-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: 1.2rem;
    align-items: stretch;
}

.sheet-panel,
.sheet-hero-main,
.sheet-hero-diagram {
    border: 1px solid var(--sheet-border);
    border-radius: 20px;
    background: rgba(128, 128, 128, 0.045);
}

.sheet-hero-main {
    padding: clamp(1.45rem, 4vw, 3rem);
}

.sheet-eyebrow {
    margin: 0 0 0.65rem;
    color: var(--sheet-accent);
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.sheet-hero h1 {
    margin: 0;
    font-size: clamp(2.15rem, 5vw, 4.4rem);
    line-height: 1.03;
    letter-spacing: -0.05em;
}

.sheet-lead {
    max-width: 800px;
    margin: 1.1rem 0 0;
    font-size: clamp(1rem, 2vw, 1.18rem);
    opacity: 0.78;
}

.sheet-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.48rem;
    margin-top: 1.25rem;
}

.sheet-badge {
    padding: 0.38rem 0.65rem;
    border: 1px solid var(--sheet-border);
    border-radius: 999px;
    background: rgba(128, 128, 128, 0.055);
    font-size: 0.78rem;
}

.sheet-hero-diagram {
    min-height: 330px;
    display: grid;
    place-items: center;
    overflow: hidden;
    padding: 1rem;
    background:
        linear-gradient(rgba(37, 99, 235, 0.065) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.065) 1px, transparent 1px),
        radial-gradient(circle, rgba(15, 159, 141, 0.15), transparent 68%);
    background-size: 28px 28px, 28px 28px, auto;
}

.sheet-hero-diagram svg {
    width: min(100%, 390px);
    height: auto;
    overflow: visible;
}

.sheet-section {
    margin-top: 3rem;
    scroll-margin-top: 6rem;
}

.sheet-section-header {
    max-width: 900px;
    margin-bottom: 1.2rem;
}

.sheet-section-header h2 {
    margin: 0;
    font-size: clamp(1.7rem, 4vw, 2.65rem);
    letter-spacing: -0.035em;
}

.sheet-section-header p {
    margin: 0.6rem 0 0;
    opacity: 0.74;
}

.sheet-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.sheet-grid.three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sheet-card {
    padding: 1.2rem;
}

.sheet-card h3 {
    margin: 0 0 0.55rem;
}

.sheet-card p,
.sheet-card li {
    opacity: 0.78;
}

.sheet-card ul,
.sheet-card ol {
    margin-bottom: 0;
    padding-left: 1.2rem;
}

.sheet-fact {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.8rem;
    align-items: start;
}

.sheet-fact-icon {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border-radius: 12px;
    color: var(--sheet-accent);
    background: var(--sheet-soft);
    font-weight: 850;
}

.sheet-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--sheet-border);
    border-radius: 18px;
}

.sheet-table {
    width: 100%;
    min-width: 720px;
    border-collapse: collapse;
}

.sheet-table th,
.sheet-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--sheet-border);
    text-align: left;
}

.sheet-table th {
    background: rgba(128, 128, 128, 0.07);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.sheet-table td {
    opacity: 0.8;
}

.sheet-table td:first-child {
    opacity: 1;
    font-weight: 750;
}

.sheet-table tr:last-child td {
    border-bottom: 0;
}

.sheet-formula {
    padding: 1.2rem;
    border-left: 5px solid var(--sheet-accent);
}

.sheet-formula code {
    display: block;
    margin-top: 0.8rem;
    padding: 0.9rem;
    overflow-x: auto;
    border-radius: 12px;
    color: inherit;
    background: rgba(128, 128, 128, 0.085);
    font-size: 1.02rem;
}

.sheet-warning {
    padding: 1.15rem;
    border-color: rgba(180, 83, 9, 0.42);
    background: rgba(180, 83, 9, 0.08);
}

.sheet-danger {
    padding: 1.15rem;
    border-color: rgba(185, 28, 28, 0.42);
    background: rgba(185, 28, 28, 0.08);
}

.sheet-warning h3,
.sheet-danger h3 {
    margin-top: 0;
}

.sheet-steps {
    display: grid;
    gap: 0.8rem;
    counter-reset: construction-step;
}

.sheet-step {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.9rem;
    padding: 1rem;
    counter-increment: construction-step;
}

.sheet-step::before {
    content: counter(construction-step);
    display: grid;
    width: 34px;
    height: 34px;
    place-items: center;
    border-radius: 10px;
    color: white;
    background: var(--sheet-accent);
    font-size: 0.82rem;
    font-weight: 850;
}

.sheet-step h3 {
    margin: 0 0 0.35rem;
}

.sheet-step p {
    margin: 0;
    opacity: 0.78;
}

.sheet-radiation {
    padding: 1.2rem;
    text-align: center;
}

.sheet-radiation svg {
    width: min(100%, 500px);
    height: auto;
}

.sheet-back {
    display: inline-flex;
    margin-top: 2rem;
    padding: 0.72rem 1rem;
    border: 1px solid var(--sheet-border);
    border-radius: 12px;
    color: inherit;
    text-decoration: none;
    font-weight: 750;
}

@media (max-width: 900px) {
    .sheet-hero,
    .sheet-grid,
    .sheet-grid.three {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 680px) {
    .antenna-sheet {
        padding-top: 0.7rem;
    }

    .sheet-hero-diagram {
        min-height: 260px;
    }

    .sheet-fact {
        grid-template-columns: 1fr;
    }
}