/* базовая тёмная тема */
:root {
    --bg: #0e1217;
    --panel: #141a22;
    --muted: #8a94a6;
    --text: #e6e9ef;
    --primary: #2d8cff;
    --border: #223044;
    --danger: #ff6464;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.5 system-ui, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

header { padding: 20px 24px 0; }
header h1 { margin: 0 0 6px; font-size: 18px; font-weight: 700; }
.muted { color: var(--muted); }
#health.bad { color: var(--danger); }

main { max-width: 840px; margin: 20px auto; padding: 0 16px; }

form#plan-form {
    background: var(--panel);
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 14px;
}

.row {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 14px;
    align-items: center;
    margin-bottom: 14px;
}

label { color: var(--text); opacity: .9; }
select, input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    background: #0f141b;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 10px;
    outline: none;
}
select:focus, input[type="text"]:focus { border-color: var(--primary); }

.readonly-input { opacity: .75; cursor: default; }

#calc-btn {
    margin-top: 8px;
    width: 100%;
    padding: 12px 14px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
}
#calc-btn:disabled { opacity: .6; cursor: progress; }

/* карточки с результатами */
.card {
    background: var(--panel);
    margin-top: 18px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 14px;
}
.hidden { display: none; }

.kv {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px 16px;
    margin-top: 8px;
}
.kv > div {
    background: #0f141b;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 12px;
}
.kv span { color: var(--muted); display: block; font-size: 12px; margin-bottom: 6px; }
.kv b { font-weight: 700; }

/* таблица */
.table-wrap { overflow-x: auto; }
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
.table th, .table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    white-space: nowrap;
}
.table thead th { color: var(--muted); font-weight: 600; }
.table td.num { text-align: right; }

/* верхняя панель с кнопкой языка */
.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    justify-content: flex-end;
    padding: 8px 12px;
    background: rgba(14,18,23,0.6);
    backdrop-filter: blur(4px);
    border-bottom: 1px solid rgba(255,255,255,0.04);
}
.lang-btn {
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    transition: transform .05s ease-in-out, opacity .2s ease;
}
.lang-btn:hover { opacity: .9; }
.lang-btn:active { transform: scale(.98); }

/* адаптив */
@media (max-width: 720px) {
    .row { grid-template-columns: 1fr; }
}