/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg:        #1a1a22;
    --bg2:       #22222e;
    --bg3:       #2a2a38;
    --border:    #38384a;
    --accent:    #6488d8;
    --accent2:   #4a6abf;
    --text:      #dcdcdc;
    --text2:     #888899;
    --success:   #4caf80;
    --radius:    10px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, sans-serif;
    font-size: 14px;
    min-height: 100vh;
}

/* ── App shell ────────────────────────────────────────────────────────────── */
.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0 16px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 28px;
}

header h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text);
}

header h1 span { color: var(--accent); }

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text2);
    transition: background 0.4s;
}
.status-dot.connected    { background: var(--success); }
.status-dot.disconnected { background: #e05555; }

/* ── Main layout ─────────────────────────────────────────────────────────── */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    flex: 1;
    padding-bottom: 28px;
}

@media (max-width: 680px) {
    main { grid-template-columns: 1fr; }
}

/* ── Panels ──────────────────────────────────────────────────────────────── */
.panel {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ── Drop zone ───────────────────────────────────────────────────────────── */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(100, 136, 216, 0.06);
}

.drop-zone input[type=file] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.drop-icon { font-size: 36px; margin-bottom: 12px; }

.drop-zone p {
    color: var(--text2);
    line-height: 1.6;
}
.drop-zone p span { color: var(--accent); }

/* ── Preview ─────────────────────────────────────────────────────────────── */
.preview-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.preview-wrap img {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg3);
}

/* ── Geometry tabs ───────────────────────────────────────────────────────── */
.geom-group { display: flex; flex-direction: column; gap: 8px; }

.group-label {
    font-size: 12px;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.geom-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.geom-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 10px 4px 8px;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text2);
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    font-size: 11px;
}

.geom-tab svg {
    width: 32px;
    height: 28px;
}

.geom-tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.geom-tab.active {
    border-color: var(--accent);
    background: rgba(100, 136, 216, 0.12);
    color: var(--accent);
}

/* ── Parameters ──────────────────────────────────────────────────────────── */
.params {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.params label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text2);
    font-size: 13px;
    margin-bottom: 6px;
}

.params .val { color: var(--accent); font-weight: 600; }

input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--bg3);
    outline: none;
    cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: background 0.2s;
}

input[type=range]::-webkit-slider-thumb:hover { background: var(--accent2); }

/* Toggle switch */
.toggle-label {
    display: flex !important;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.toggle-label input[type=checkbox] { display: none; }

.toggle {
    width: 38px;
    height: 20px;
    background: var(--bg3);
    border-radius: 10px;
    position: relative;
    transition: background 0.2s;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.toggle::after {
    content: '';
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text2);
    top: 2px;
    left: 2px;
    transition: left 0.2s, background 0.2s;
}

.toggle-label input:checked + .toggle { background: var(--accent2); }
.toggle-label input:checked + .toggle::after {
    left: 20px;
    background: #fff;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn-primary {
    display: block;
    width: 100%;
    padding: 12px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: background 0.2s, opacity 0.2s;
}

.btn-primary:hover:not(:disabled) { background: var(--accent2); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-ghost {
    display: block;
    width: 100%;
    padding: 10px;
    background: transparent;
    color: var(--text2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-icon {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text2);
    font-size: 16px;
    width: 30px;
    height: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s, color 0.2s;
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }

/* ── Result panel placeholders ───────────────────────────────────────────── */
.result-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    color: var(--text2);
}

.placeholder-icon { font-size: 48px; opacity: 0.3; }

/* ── Progress ────────────────────────────────────────────────────────────── */
.progress-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.stage-label {
    color: var(--text2);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.progress-track {
    width: 100%;
    height: 6px;
    background: var(--bg3);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.4s ease;
}

.progress-pct {
    color: var(--accent);
    font-size: 28px;
    font-weight: 700;
}

/* ── 3D Viewer ───────────────────────────────────────────────────────────── */
.viewer-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 0;
}

.viewer-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.viewer-title {
    font-size: 13px;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#stlViewer {
    flex: 1;
    min-height: 300px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg3);
    border: 1px solid var(--border);
}

#stlViewer canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

.viewer-hint {
    text-align: center;
    font-size: 11px;
    color: var(--text2);
    opacity: 0.6;
}

.viewer-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}