/* ============================================================
   CCTV Designer v2 — Layout
   Shell: topbar / tool rail / side panel / canvas / statusbar
   ============================================================ */

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-md);
    line-height: var(--leading);
    color: var(--text-1);
    background: var(--bg-0);
    -webkit-font-smoothing: antialiased;
}

#app {
    display: grid;
    grid-template-areas:
        "topbar topbar"
        "rail   main"
        "status status";
    grid-template-rows: var(--topbar-h) 1fr var(--statusbar-h);
    grid-template-columns: var(--rail-w) 1fr;
    height: 100%;
}

/* ---------- Top bar ---------- */
.topbar {
    grid-area: topbar;
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    padding: 0 var(--sp-4);
    background: var(--bg-1);
    border-bottom: 1px solid var(--border-1);
}

.topbar .brand {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-weight: 700;
    font-size: var(--text-lg);
    color: var(--text-1);
    white-space: nowrap;
}

.topbar .brand .badge {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--brand-400);
    background: rgba(59, 130, 246, 0.12);
    padding: 2px 6px;
    border-radius: var(--r-sm);
}
.topbar .brand .licence-badge.demo { color: #f59e0b; background: rgba(245, 158, 11, .14); }
.topbar .brand .licence-badge.pro { color: var(--success); background: var(--success-soft); }

.topbar .project-name {
    color: var(--text-2);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--r-md);
    padding: var(--sp-1) var(--sp-2);
    font: inherit;
    min-width: 160px;
    max-width: 320px;
}

.topbar .project-name:hover { border-color: var(--border-2); }
.topbar .project-name:focus { outline: none; border-color: var(--brand-500); }

.topbar .spacer { flex: 1; }

/* ---------- Tool rail (left icon column) ---------- */
.rail {
    grid-area: rail;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-1);
    padding: var(--sp-2) 0;
    background: var(--bg-1);
    border-right: 1px solid var(--border-1);
    overflow-y: auto;
    scrollbar-width: none;
}
.rail::-webkit-scrollbar { display: none; }

.rail .rail-sep {
    width: 24px;
    height: 1px;
    background: var(--border-1);
    margin: var(--sp-1) 0;
}

/* ---------- Main area (canvas + panel) ---------- */
.main {
    grid-area: main;
    display: flex;
    min-width: 0;
    min-height: 0;
}

.canvas-wrap {
    position: relative;
    flex: 1;
    min-width: 0;
    background: var(--bg-inset);
}

#design-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

/* floating canvas HUD (zoom controls) */
.canvas-hud {
    position: absolute;
    right: var(--sp-4);
    bottom: var(--sp-4);
    display: flex;
    flex-direction: column;
    gap: var(--sp-1);
    padding: var(--sp-1);
    background: var(--bg-1);
    border: 1px solid var(--border-2);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-md);
}

.wall-hud {
    position: absolute;
    left: 50%;
    top: var(--sp-4);
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: 7px 9px 7px 12px;
    color: var(--text-1);
    background: color-mix(in srgb, var(--bg-1) 94%, transparent);
    border: 1px solid var(--border-2);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-md);
    z-index: 12;
    font-size: var(--text-sm);
}

.wall-hud[hidden] { display: none; }

/* ---------- Side panel (right, contextual) ---------- */
.panel {
    width: var(--panel-w);
    background: var(--bg-1);
    border-left: 1px solid var(--border-1);
    overflow-y: auto;
}

.panel-section {
    border-bottom: 1px solid var(--border-1);
}

.panel-section > .section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--sp-3) var(--sp-4);
    cursor: pointer;
    user-select: none;
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.panel-section > .section-head:hover { color: var(--text-1); }

.panel-section > .section-body {
    padding: var(--sp-2) var(--sp-4) var(--sp-4);
}

.panel-section.collapsed > .section-body { display: none; }

.panel-section > .section-head .chev {
    transition: transform var(--t-fast);
    color: var(--text-3);
    font-size: 10px;
}
.panel-section.collapsed > .section-head .chev { transform: rotate(-90deg); }

/* ---------- Status bar ---------- */
.statusbar {
    grid-area: status;
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    padding: 0 var(--sp-4);
    background: var(--bg-1);
    border-top: 1px solid var(--border-1);
    font-size: var(--text-xs);
    color: var(--text-3);
}

.statusbar .status-item {
    display: flex;
    align-items: center;
    gap: var(--sp-1);
    white-space: nowrap;
}

.statusbar .spacer { flex: 1; }

/* ---------- Empty state ---------- */
.empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-6);
    pointer-events: none;
}

.empty-state .cards {
    display: flex;
    gap: var(--sp-4);
    pointer-events: auto;
}

.empty-state .card {
    width: 180px;
    padding: var(--sp-5);
    background: var(--bg-1);
    border: 1px solid var(--border-2);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    cursor: pointer;
    transition: transform var(--t-fast), border-color var(--t-fast);
}

.empty-state .card:hover {
    transform: translateY(-2px);
    border-color: var(--brand-500);
}

.empty-state .card .icon {
    font-size: 28px;
    margin-bottom: var(--sp-2);
}

.empty-state .card h3 {
    font-size: var(--text-md);
    margin-bottom: var(--sp-1);
}

.empty-state .card p {
    font-size: var(--text-xs);
    color: var(--text-3);
}

/* ---------- Toasts ---------- */
.toast-area {
    position: fixed;
    bottom: calc(var(--statusbar-h) + var(--sp-4));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-2);
    z-index: 1000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-4);
    background: var(--bg-2);
    border: 1px solid var(--border-2);
    border-radius: var(--r-full);
    box-shadow: var(--shadow-lg);
    font-size: var(--text-sm);
    color: var(--text-1);
    animation: toast-in var(--t-med);
}

.toast.success { border-color: var(--success); }
.toast.error   { border-color: var(--danger); }
.toast.warning { border-color: var(--warning); }

@keyframes toast-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}