/* ===== Сайт «КСВ · Антенны · TYT в поле» — тёмная тема (v2) ===== */

:root {
    --bg: #070b14;
    --bg2: #0c1220;
    --card: #121a2c;
    --line: #223052;
    --text: #dbe4f5;
    --muted: #8fa2c4;
    --amber: #ffb020;
    --cyan: #22d3ee;
    --green: #34d399;
    --red: #f87171;
    --orange: #fb923c;
    --violet: #a78bfa;
    --blue: #60a5fa;
    --pink: #f472b6;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
    background:
        radial-gradient(900px 500px at 85% -10%, #14304d66, transparent),
        radial-gradient(700px 420px at -10% 8%, #3a2a1055, transparent),
        var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 18px; width: 100%; }
main.wrap { flex: 1; padding-top: 26px; padding-bottom: 54px; }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Шапка с вкладками ===== */

.site-header {
    position: sticky; top: 0; z-index: 50;
    background: #0a101dee;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
}

.header-row {
    display: flex; align-items: center; gap: 22px;
    min-height: 58px; flex-wrap: wrap;
}

.brand {
    font-size: 1.15rem; font-weight: 800;
    background: linear-gradient(90deg, var(--amber), var(--cyan));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    white-space: nowrap;
}
.brand:hover { text-decoration: none; }

.tabs { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }

.tab {
    color: var(--muted); font-weight: 600; font-size: 0.95rem;
    padding: 9px 14px; border-radius: 10px;
    white-space: nowrap; position: relative;
    transition: color .15s, background .15s;
}
.tab:hover { color: var(--text); background: #ffffff0d; text-decoration: none; }
.tab.active { color: #fff; background: #ffffff12; }
.tab.active::after {
    content: ""; position: absolute; left: 12px; right: 12px; bottom: 3px; height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--amber), var(--cyan));
}

/* ===== Герой и заголовки страниц ===== */

.hero { position: relative; padding: 34px 0 10px; overflow: hidden; }
.hero-glow {
    position: absolute; inset: -40% -20% auto -20%; height: 320px; pointer-events: none;
    background:
        radial-gradient(420px 180px at 20% 50%, #22d3ee22, transparent),
        radial-gradient(420px 180px at 75% 50%, #ffb02022, transparent);
    filter: blur(6px);
}

.eyebrow {
    display: inline-block; font-size: .8rem; font-weight: 700;
    letter-spacing: .13em; text-transform: uppercase;
    color: var(--amber); border: 1px solid #ffb02055;
    background: #ffb02014; border-radius: 999px; padding: 5px 14px;
    margin-bottom: 12px; position: relative;
}

h1 {
    font-size: clamp(1.7rem, 4.5vw, 2.7rem); line-height: 1.18;
    margin: 10px 0 14px; position: relative;
}
.accent {
    background: linear-gradient(90deg, var(--amber), #ff7e33, var(--cyan));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}

.lead { font-size: 1.08rem; color: var(--muted); max-width: 780px; position: relative; }

.page-head { padding: 8px 0 4px; }

.section-title {
    font-size: 1.35rem; margin: 42px 0 6px;
    padding-left: 14px; border-left: 4px solid;
    border-image: linear-gradient(180deg, var(--cyan), var(--violet)) 1;
}

/* ===== Кнопки и статистика ===== */

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 26px; }

.btn {
    display: inline-block; font-weight: 700; font-size: .97rem;
    padding: 12px 22px; border-radius: 12px; border: 1px solid transparent;
    transition: transform .15s, box-shadow .15s, background .15s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn.primary {
    color: #06121c;
    background: linear-gradient(90deg, var(--amber), var(--cyan));
    box-shadow: 0 10px 26px #22d3ee33;
}
.btn.primary:hover { box-shadow: 0 14px 32px #22d3ee4d; }
.btn.ghost {
    color: var(--cyan); border-color: #22d3ee66; background: #22d3ee14;
}
.btn.ghost:hover { background: #22d3ee22; }

.stat-row {
    display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    margin-top: 8px;
}
.stat {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 14px; padding: 14px 16px;
    border-top: 3px solid transparent;
    border-image: linear-gradient(90deg, var(--amber), var(--cyan)) 1;
}
.stat b { display: block; font-size: 1.35rem; font-weight: 800; color: #fff; }
.stat span { color: var(--muted); font-size: .87rem; }

/* ===== Карточки ===== */

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(255px, 1fr)); margin-top: 16px; }

.card {
    background: var(--card);
    border: 1px solid var(--line); border-radius: 16px;
    padding: 20px; display: block; color: var(--text);
    position: relative; overflow: hidden;
    transition: transform .18s, border-color .18s, box-shadow .18s;
}
.card::before {
    content: ""; position: absolute; inset: 0 0 auto 0; height: 4px;
    background: var(--card-accent, linear-gradient(90deg, var(--cyan), var(--violet)));
}
.card:hover {
    text-decoration: none; transform: translateY(-4px);
    border-color: #33507e;
    box-shadow: 0 14px 34px #00000066;
}
.card-icon { font-size: 1.9rem; margin-bottom: 4px; }
.card h3 { margin: 8px 0 8px; font-size: 1.12rem; }
.card p { color: var(--muted); font-size: .95rem; }
.card-more { display: inline-block; margin-top: 12px; font-weight: 700; font-size: .9rem; color: var(--cyan); }

.card-grad-cyan   { --card-accent: linear-gradient(90deg, var(--cyan), var(--blue)); }
.card-grad-green  { --card-accent: linear-gradient(90deg, var(--green), var(--cyan)); }
.card-grad-violet { --card-accent: linear-gradient(90deg, var(--violet), var(--pink)); }
.card-grad-orange { --card-accent: linear-gradient(90deg, var(--amber), var(--orange)); }
.card-grad-blue   { --card-accent: linear-gradient(90deg, var(--blue), var(--violet)); }
.card-grad-pink   { --card-accent: linear-gradient(90deg, var(--pink), var(--amber)); }

/* ===== Две колонки и панели ===== */

.two-col { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; margin-top: 16px; }

.panel {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 16px; padding: 22px; margin: 4px 0;
}
.panel h3 { margin-bottom: 10px; font-size: 1.06rem; color: #fff; }
.panel p { margin: 8px 0; color: var(--text); font-size: .96rem; }
.panel ul.list, .panel ol { margin: 8px 0 8px 20px; }
.panel ul.list li, .panel ol li { margin: 7px 0; font-size: .95rem; color: var(--text); }

.formula {
    font-family: Consolas, "Courier New", monospace;
    background: var(--bg2); border: 1px dashed var(--line);
    border-radius: 10px; padding: 10px 14px; margin: 12px 0 !important;
    color: var(--cyan); font-size: .95rem; line-height: 1.9;
}

.hint { color: var(--muted); font-size: .9rem !important; }

.warn-strip {
    background: #fb923c14; border-left: 4px solid var(--orange);
    border-radius: 0 10px 10px 0; padding: 10px 14px; margin-top: 12px;
    font-size: .9rem; color: #ffd9b8;
}

.note {
    border-left: 4px solid var(--cyan); background: #22d3ee10;
    border-radius: 0 12px 12px 0; padding: 14px 18px; margin: 30px 0 6px;
    font-size: .95rem; color: var(--text);
}
.note b { color: var(--cyan); }

/* ===== Мини-таблицы и бейджи ===== */

.mini-table { display: grid; gap: 8px; margin: 12px 0 14px; font-size: .93rem; }
.mini-table > div {
    background: var(--bg2); border: 1px solid var(--line);
    border-radius: 10px; padding: 8px 12px;
}

.pill {
    display: inline-block; font-weight: 700; font-size: .8rem;
    padding: 3px 10px; border-radius: 999px; margin-right: 8px;
    border: 1px solid transparent; min-width: 62px; text-align: center;
}
.pill-good { background: #34d39922; color: var(--green); border-color: #34d39955; }
.pill-warn { background: #facc1522; color: #facc15; border-color: #facc1555; }
.pill-bad  { background: #fb923c22; color: var(--orange); border-color: #fb923c55; }
.pill-crit { background: #f8717122; color: var(--red); border-color: #f8717155; }

/* ===== Таблицы ===== */

.tbl {
    width: 100%; border-collapse: collapse; margin: 12px 0;
    font-size: .93rem; display: block; overflow-x: auto;
}
.tbl th, .tbl td {
    border: 1px solid var(--line); padding: 9px 13px; text-align: left;
    vertical-align: top;
}
.tbl th { background: #1a2740; color: var(--cyan); font-weight: 700; white-space: nowrap; }
.tbl tr:nth-child(even) td { background: #ffffff06; }
.tbl tr:hover td { background: #ffffff0a; }
.tbl-wide { font-size: .95rem; }

/* ===== Графики ===== */

.chart-box {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 16px; padding: 16px; margin: 16px 0 8px;
}
.chart { width: 100%; height: 320px; display: block; }
.caption { color: var(--muted); font-size: .87rem; margin-top: 10px; padding: 0 6px; }

/* ===== Калькуляторы ===== */

.calc {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 16px; padding: 20px; margin: 16px 0;
}
.calc > p { font-size: .96rem; margin-bottom: 10px; }

.calc-row { display: flex; flex-direction: column; gap: 6px; max-width: 320px; }
.calc-row label { font-size: .88rem; color: var(--muted); font-weight: 600; }
.calc input[type=number] {
    width: 100%; padding: 11px 13px; font-size: 1.05rem;
    background: var(--bg2); color: var(--text);
    border: 1px solid var(--line); border-radius: 10px;
    font-variant-numeric: tabular-nums;
}
.calc input:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px #22d3ee22; }

.presets { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 4px; }
.preset {
    border: 1px solid var(--line); background: #16203450; color: var(--muted);
    border-radius: 999px; padding: 6px 13px; font-size: .85rem; cursor: pointer;
    font-weight: 600; transition: all .15s;
}
.preset:hover { border-color: var(--cyan); color: var(--cyan); background: #22d3ee14; }

.calc-out { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.out-box {
    flex: 1 1 170px;
    background: var(--bg2); border: 1px solid var(--line);
    border-radius: 12px; padding: 12px 16px;
}
.out-box span { display: block; color: var(--muted); font-size: .82rem; margin-bottom: 2px; }
.out-box b {
    font-size: 1.5rem; font-weight: 800; color: var(--cyan);
    font-variant-numeric: tabular-nums;
}

.verdict { margin-top: 12px; font-weight: 700; font-size: .97rem; }
.v-good { color: var(--green); }
.v-ok   { color: #facc15; }
.v-bad  { color: var(--red); }

/* ===== Шаги ===== */

.steps { counter-reset: step; list-style: none; margin: 10px 0; }
.steps li {
    counter-increment: step; position: relative;
    padding: 10px 0 10px 50px; border-bottom: 1px dashed #ffffff10;
    font-size: .95rem;
}
.steps li:last-child { border-bottom: none; }
.steps li::before {
    content: counter(step);
    position: absolute; left: 0; top: 8px;
    width: 34px; height: 34px; border-radius: 50%;
    display: grid; place-items: center; font-weight: 800; color: #071018;
    background: linear-gradient(135deg, var(--amber), var(--cyan));
}

.steps-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); margin-top: 16px; }
.step-card {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 14px; padding: 16px 18px; position: relative;
}
.step-card > b {
    display: inline-grid; place-items: center;
    width: 32px; height: 32px; border-radius: 50%;
    background: linear-gradient(135deg, var(--amber), var(--cyan));
    color: #071018; font-weight: 800; margin-bottom: 8px;
}
.step-card h4 { font-size: .98rem; margin-bottom: 6px; color: #fff; }
.step-card p { color: var(--muted); font-size: .88rem; }

.check-list { list-style: none; margin: 8px 0; }
.check-list li {
    padding: 7px 0 7px 30px; position: relative;
    border-bottom: 1px dashed #ffffff10; font-size: .94rem;
}
.check-list li:last-child { border-bottom: none; }
.check-list li::before {
    content: "✔"; position: absolute; left: 2px; top: 7px;
    color: var(--green); font-weight: 900;
}

/* ===== Видео ===== */

.video-grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); margin-top: 16px; }
.video-card {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 14px; overflow: hidden;
    transition: transform .18s, border-color .18s;
}
.video-card:hover { transform: translateY(-3px); border-color: #33507e; }
.ratio { position: relative; padding-top: 56.25%; background: #000; }
.ratio iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-meta { padding: 12px 15px; }
.video-meta h4 { font-size: .97rem; margin-bottom: 4px; }
.video-meta p { color: var(--muted); font-size: .87rem; }

/* ===== Футер ===== */

.site-footer {
    border-top: 1px solid var(--line); background: #0a101d;
    padding: 20px 0; font-size: .88rem; color: var(--muted);
}
.foot-note { margin-bottom: 6px; }
.foot-links a { color: var(--muted); }
.foot-links a:hover { color: var(--cyan); }

/* ===== Адаптив ===== */

@media (max-width: 760px) {
    .two-col { grid-template-columns: 1fr; }
    .header-row { gap: 8px; padding-top: 8px; padding-bottom: 8px; }
    .hero { padding-top: 22px; }
    .chart { height: 260px; }
    .stat b { font-size: 1.2rem; }
}