:root {
    --bg: #0f172a;
    --bg-soft: #111c34;
    --card: rgba(16, 24, 40, 0.88);
    --card-strong: rgba(15, 23, 42, 0.96);
    --text: #e5eefc;
    --muted: #9fb1cf;
    --accent: #8b5cf6;
    --accent-2: #22c55e;
    --accent-light: rgba(139, 92, 246, 0.12);
    --border: rgba(148, 163, 184, 0.22);
    --shadow: 0 14px 42px rgba(2, 6, 23, 0.35);
    --shadow-hover: 0 18px 52px rgba(76, 29, 149, 0.25);
    --radius: 18px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
    margin: 0;
    font-family: Inter, "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background:
        radial-gradient(circle at top, rgba(139, 92, 246, 0.18), transparent 28%),
        radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.12), transparent 22%),
        linear-gradient(160deg, #0b1220 0%, #111827 45%, #0f172a 100%);
    color: var(--text);
}
button, input, select, textarea { font: inherit; }

.app-shell {
    width: min(1900px, calc(100% - 28px));
    margin: 18px auto 36px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 18px;
    padding: 22px 24px;
    background: linear-gradient(180deg, rgba(30,41,59,0.92), rgba(15,23,42,0.96));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    backdrop-filter: blur(12px);
}
.topbar h1 { margin: 0 0 6px; font-size: clamp(1.35rem, 2vw, 2rem); font-weight: 800; letter-spacing: -0.03em; }
.topbar h1 i { color: #c4b5fd; margin-right: 8px; }
.topbar p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.mode-switch {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}
.mode-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.85);
    color: #cbd5e1;
    font-weight: 700;
    font-size: 0.93rem;
    cursor: pointer;
    transition: all 0.2s ease;
}
.mode-btn:hover { border-color: rgba(196,181,253,0.45); color: #fff; background: rgba(91, 33, 182, 0.22); }
.mode-btn.active { background: linear-gradient(135deg, #7c3aed, #4f46e5); color: white; border-color: rgba(196,181,253,0.45); box-shadow: 0 8px 24px rgba(91,33,182,0.33); }

.editor-panel { display: none; }
.editor-panel.active { display: block; }

.editor-layout {
    display: grid;
    grid-template-columns: 300px minmax(960px, 1fr) 300px;
    gap: 22px;
    align-items: start;
    justify-content: center;
}

.side-column {
    display: grid;
    gap: 16px;
    align-content: start;
    position: sticky;
    top: 12px;
}

.left-tools {
    grid-column: 1;
}

.center-workspace {
    grid-column: 2;
    min-width: 0;
    display: flex;
    justify-content: center;
}

.right-tools {
    grid-column: 3;
}

.panel-card,
.workspace-card {
    background: linear-gradient(180deg, rgba(15,23,42,0.92), rgba(17,24,39,0.96));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.2s;
    backdrop-filter: blur(10px);
}
.panel-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }
.workspace-card {
    width: min(100%, 1160px);
    margin-inline: auto;
}

.panel-card h2 {
    margin: 0 0 16px;
    font-size: 0.88rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #cbd5e1;
    display: flex;
    align-items: center;
    gap: 8px;
}
.panel-card h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 14px;
    background: linear-gradient(180deg, #c4b5fd, #22c55e);
    border-radius: 999px;
    flex-shrink: 0;
}
.panel-card label {
    display: block;
    font-size: 0.77rem;
    font-weight: 700;
    margin: 14px 0 5px;
    color: #a5b4fc;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

select, input[type="text"], input[type="file"] {
    width: 100%;
    padding: 11px 12px;
    border-radius: 12px;
    border: 1px solid rgba(148,163,184,0.18);
    background: rgba(15, 23, 42, 0.9);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    font-size: 0.92rem;
}
select:focus, input[type="text"]:focus {
    outline: none;
    border-color: rgba(196,181,253,0.5);
    box-shadow: 0 0 0 3px rgba(139,92,246,0.16);
    background: rgba(15, 23, 42, 0.98);
}
input[type="color"] {
    width:100%;
    height:46px;
    padding:4px;
    border:1px solid rgba(148,163,184,0.18);
    border-radius:12px;
    background:rgba(15,23,42,0.95);
    cursor:pointer;
}
input[type="range"] { width:100%; accent-color: #8b5cf6; cursor:pointer; margin-top:4px; }

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 1px solid rgba(148,163,184,0.18);
    border-radius: 12px;
    background: rgba(15,23,42,0.9);
    color: var(--text);
    padding: 10px 14px;
    font-size: 0.89rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.18s ease;
    white-space: nowrap;
}
button:hover {
    transform: translateY(-1px);
    border-color: rgba(196,181,253,0.45);
    color: #fff;
    background: rgba(91, 33, 182, 0.22);
    box-shadow: 0 8px 18px rgba(76,29,149,0.18);
}
button:active { transform: translateY(0); }
.history-actions button { background: linear-gradient(135deg, #7c3aed, #4f46e5); color:white; border-color: transparent; }
.history-actions button:hover { background: linear-gradient(135deg, #8b5cf6, #6366f1); color:white; }
.stacked-actions { display:grid; gap:8px; margin-top:14px; }
.history-actions { display:flex; gap:8px; }
.inline-value { display:inline-block; margin-top:4px; color:#c4b5fd; font-size:0.85rem; font-weight:700; }

.canvas-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    color: var(--muted);
    font-size: 0.86rem;
}
.canvas-toolbar i { margin-right:6px; color:#c4b5fd; }

.canvas-container {
    width: 100%;
    overflow: auto;
    border-radius: 16px;
    border: 1px solid rgba(148,163,184,0.18);
    background:
      linear-gradient(90deg, rgba(139,92,246,0.08) 1px, transparent 1px),
      linear-gradient(rgba(139,92,246,0.08) 1px, transparent 1px),
      linear-gradient(180deg, rgba(255,255,255,0.98), rgba(241,245,249,0.98));
    background-size: 24px 24px;
    padding: 14px;
}
canvas {
    display:block;
    margin:0 auto;
    background:transparent;
    cursor:crosshair;
    border-radius: 10px;
    max-width: 100%;
}
canvas.select-mode { cursor: grab; }
canvas.select-mode.dragging { cursor: grabbing; }

.workspace-card-3d {
    width: min(100%, 1240px);
    min-height: 790px;
}
.three-viewport {
    width: 100%;
    min-height: 720px;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(148,163,184,0.18);
    background: radial-gradient(ellipse at 30% 20%, #223761 0%, #0f172a 70%);
    position: relative;
}
.three-viewport > canvas { display: block !important; width: 100% !important; height: 100% !important; }
.three-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 660px;
    color: #94a3b8;
    text-align: center;
    padding: 24px;
    gap: 16px;
    font-size: 1rem;
}
.three-placeholder i { opacity: 0.4; }
.three-placeholder strong { color: #c4b5fd; }

.mobile-only { display: none; }
.desktop-only { display: flex; }
#objectList { min-height: 220px; }
.mini-help { margin: 10px 0 0; color: var(--muted); font-size: 0.8rem; line-height: 1.45; }
#toggleBevelClick.active-toggle { background: linear-gradient(135deg, #8b5cf6, #4f46e5); color: #fff; border-color: transparent; }

@media (max-width: 1740px) {
    .editor-layout {
        grid-template-columns: 280px minmax(820px, 1fr) 280px;
    }
    .workspace-card { width: min(100%, 1080px); }
    .workspace-card-3d { width: min(100%, 1160px); }
}

@media (max-width: 1520px) {
    .editor-layout {
        grid-template-columns: 260px minmax(700px, 1fr) 260px;
        gap: 18px;
    }
}

@media (max-width: 1320px) {
    .editor-layout { grid-template-columns: 1fr; }
    .left-tools, .center-workspace, .right-tools { grid-column: auto; }
    .side-column { position: static; }
    .mobile-only { display: block; }
    .desktop-only { display: none; }
    .workspace-card, .workspace-card-3d { width: 100%; }
}

@media (max-width: 640px) {
    .app-shell { width: calc(100% - 16px); margin: 12px auto 24px; }
    .topbar { padding: 16px; flex-direction: column; }
    .panel-card, .workspace-card { padding: 16px; }
    .three-viewport { min-height: 520px; }
}

#objectList option { padding: 6px 8px; }
.three-viewport { display: flex; }
.three-viewport > canvas { border-radius: 16px; }