:root {
    --bg: #f4f5f7;
    --surface: #ffffff;
    --surface-2: #eef0f3;
    --text: #1b1f24;
    --text-muted: #5c6672;
    --border: #d7dbe1;
    --accent: #1f6feb;
    --accent-contrast: #ffffff;
    --danger: #c92a2a;
    --success: #2f9e44;
    --node-fill: #c9d4e0;
    --node-stroke: #5c6672;
    --node-fill-active: #1f6feb;
    --node-fill-empty: #e4e7ec;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171c;
        --surface: #1c2027;
        --surface-2: #242933;
        --text: #e7eaee;
        --text-muted: #9aa4b2;
        --border: #30363f;
        --accent: #4c8dff;
        --accent-contrast: #0b0e12;
        --danger: #ff6b6b;
        --success: #51cf66;
        --node-fill: #3a4455;
        --node-stroke: #9aa4b2;
        --node-fill-active: #4c8dff;
        --node-fill-empty: #2a2f38;
        --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    }
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-width: 360px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.45;
    overflow-x: hidden;
}

a { color: var(--accent); }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 12px 32px;
}

/* ─── Шапка ─── */
.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 10px 12px;
    position: sticky;
    top: 0;
    z-index: 20;
}

.topbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.topbar-title {
    font-weight: 700;
    font-size: 16px;
    margin-right: auto;
    white-space: nowrap;
}

.topbar-user {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    gap: 8px;
    align-items: center;
}

select, input[type="text"], input[type="number"], input[type="email"], input[type="password"], textarea {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 9px 10px;
    font-size: 15px;
    max-width: 100%;
}

select:focus, input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

label { display: block; font-size: 13px; color: var(--text-muted); margin-bottom: 4px; }

.field { margin-bottom: 12px; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    color: var(--accent-contrast);
    border: none;
    border-radius: 8px;
    padding: 9px 14px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary { background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 5px 10px; font-size: 13px; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 14px;
    margin-bottom: 16px;
}

.alert {
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 14px;
    font-size: 14px;
}
.alert-error { background: rgba(201, 42, 42, 0.12); color: var(--danger); border: 1px solid rgba(201, 42, 42, 0.3); }
.alert-success { background: rgba(47, 158, 68, 0.12); color: var(--success); border: 1px solid rgba(47, 158, 68, 0.3); }

/* ─── Основной рабочий экран ─── */
.workspace {
    display: grid;
    grid-template-columns: minmax(280px, 420px) 1fr;
    gap: 16px;
    align-items: start;
    margin-top: 16px;
}

@media (max-width: 860px) {
    .workspace { grid-template-columns: 1fr; }
}

.scheme-panel { position: relative; }
.scheme-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; gap: 8px; flex-wrap: wrap; }

.scheme-svg-wrap { width: 100%; }
.scheme-svg-wrap svg { width: 100%; height: auto; display: block; }

.node-group { cursor: pointer; }
.node-shape { fill: var(--node-stroke); stroke: var(--node-stroke); stroke-width: 2; transition: fill 0.15s; }
.node-shape.empty { fill: var(--node-fill-empty); stroke: var(--node-stroke); stroke-dasharray: 4 3; }
.node-line { fill: none; stroke: var(--node-stroke); }
.node-line.empty { stroke: var(--text-muted); stroke-dasharray: 3 3; }
.node-hit { fill: #000; opacity: 0; }
.node-group:hover .node-badge-circle { stroke: var(--accent); stroke-width: 2.5; }
.node-group.is-selected .node-shape { fill: var(--node-fill-active); stroke: var(--accent); }
.node-badge-circle { fill: var(--surface); stroke: var(--node-stroke); stroke-width: 1.5; }
.node-group.is-selected .node-badge-circle { stroke: var(--accent); }
.node-group.is-empty .node-badge-circle { stroke-dasharray: 2 2; }
.node-number { font-size: 15px; font-weight: 700; fill: var(--text); text-anchor: middle; dominant-baseline: central; }
.node-group.is-empty .node-number { fill: var(--text-muted); }

.scheme-frame { fill: none; stroke: var(--node-stroke); stroke-width: 2; }
.scheme-sash { fill: var(--surface-2); stroke: var(--node-stroke); stroke-width: 2; }
.scheme-bar { stroke: var(--text-muted); stroke-width: 3; fill: none; }

.mirrored .scheme-artwork { transform: scaleX(-1); transform-origin: center; transform-box: fill-box; }
.mirrored .node-number { transform: scaleX(-1); transform-origin: center; transform-box: fill-box; }

/* ─── Фото-схема (реальный монтажный плакат с кликабельными точками, без своих номеров) ─── */
.photo-hotspot-hit { position: absolute; top: 50%; left: 50%; width: 40px; height: 40px; transform: translate(-50%, -50%); cursor: pointer; }
.photo-hotspot-marker {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 30px; height: 30px; border-radius: 50%;
    border: 2px solid var(--accent); background: transparent;
    opacity: 0.35; transition: opacity 0.15s, background-color 0.15s;
    pointer-events: none;
}
.node-group:hover .photo-hotspot-marker { opacity: 0.8; }
.node-group.is-selected .photo-hotspot-marker { opacity: 1; background: rgba(31, 111, 235, 0.18); border-width: 2.5px; }
.node-group.is-empty .photo-hotspot-marker { border-style: dashed; border-color: var(--text-muted); opacity: 0.3; }

/* Узлы без своего кружка на плакате (напр. подузел 10.1) — рисуем такой же кружок
   с номером, как у производителя на фото, только средствами CSS. */
.hotspot-edit-toggle {
    display: flex; align-items: center; gap: 6px; margin-bottom: 10px;
    cursor: pointer; font-size: 13px; color: var(--text-muted);
}
.photo-scheme.edit-mode .photo-hotspot-hit { cursor: grab; }
.photo-scheme.edit-mode .node-group.is-dragging .photo-hotspot-hit { cursor: grabbing; }
.photo-scheme.edit-mode .photo-hotspot-marker { opacity: 0.9; border-style: dashed; }
.photo-scheme.edit-mode .node-group.is-dragging { z-index: 10; }
/* Без этого на планшетах/стилусах долгое нажатие на точку открывает системное
   контекстное меню (копировать/выделить) вместо перетаскивания. */
.photo-scheme.edit-mode .node-group,
.photo-scheme.edit-mode .photo-hotspot-hit {
    touch-action: none;
    -webkit-user-select: none; user-select: none;
    -webkit-touch-callout: none;
}
.photo-hotspot-badge {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 26px; height: 26px; border-radius: 50%;
    background: #65c1be; color: #1a1a1a;
    font-size: 9px; font-weight: 700; font-family: Arial, sans-serif;
    display: flex; align-items: center; justify-content: center;
    pointer-events: none;
}

/* ─── Карточка узла ─── */
#node-card .node-card-title { font-size: 17px; font-weight: 700; margin: 0 0 4px; }
#node-card .node-card-empty { color: var(--text-muted); padding: 20px 0; text-align: center; }

.part-group { margin-bottom: 18px; }
.part-group-name { font-weight: 600; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.part-photo-link { display: inline-flex; }
.part-photo-thumb { height: 28px; width: auto; border: 1px solid var(--border); border-radius: 4px; background: #fff; }

.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }

table.data-table { width: 100%; border-collapse: collapse; font-size: 14px; white-space: nowrap; }
table.data-table th, table.data-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; }
table.data-table th { background: var(--surface-2); font-weight: 600; position: sticky; top: 0; }
table.data-table tr:last-child td { border-bottom: none; }
table.data-table td.wrap { white-space: normal; }

.article-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 8px;
    font-family: "SFMono-Regular", Consolas, Menlo, monospace;
    cursor: pointer;
}
.article-chip:hover { border-color: var(--accent); }
.article-chip.copied { background: rgba(47, 158, 68, 0.18); border-color: var(--success); }

.toast {
    position: fixed;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: var(--bg);
    padding: 9px 16px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}
.toast.show { opacity: 1; }

/* ─── Список всех деталей ─── */
.parts-list-toolbar { display: flex; gap: 8px; margin: 18px 0 10px; flex-wrap: wrap; }
.parts-list-toolbar input[type="text"] { flex: 1; min-width: 180px; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: 12px; background: var(--surface-2); color: var(--text-muted); }
.badge-din-left { background: rgba(31,111,235,0.15); color: var(--accent); }
.badge-din-right { background: rgba(31,111,235,0.15); color: var(--accent); }

.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.auth-box { width: 100%; max-width: 360px; }
.auth-box h1 { font-size: 18px; text-align: center; margin-bottom: 18px; }

.modal-backdrop {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5);
    display: none; align-items: center; justify-content: center; z-index: 50; padding: 16px;
}
.modal-backdrop.show { display: flex; }
.modal-box { background: var(--surface); border-radius: 12px; padding: 18px; max-width: 420px; width: 100%; max-height: 90vh; overflow-y: auto; }
.modal-box h2 { font-size: 16px; margin-top: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row > .field { flex: 1; min-width: 140px; }

.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }