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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: #0a0a12;
    color: #e0e0e0;
    overflow: hidden;
    height: 100vh;
    display: flex;
}

.hidden-control {
    display: none;
}

/* Sidebar */
#sidebar {
    width: 300px;
    min-width: 300px;
    background: linear-gradient(180deg, #12121a 0%, #0d0d14 100%);
    border-right: 1px solid rgba(255,255,255,0.05);
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#sidebar::-webkit-scrollbar {
    width: 6px;
}
#sidebar::-webkit-scrollbar-track {
    background: transparent;
}
#sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    margin-bottom: 8px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #e94560, #ff6b81);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transform: rotate(-15deg);
}

.logo h1 {
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    margin: 0;
}

.logo span {
    font-size: 11px;
    color: #666;
    display: block;
    margin-top: 2px;
}

.section-title {
    font-size: 10px;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: 12px 0 6px;
    font-weight: 600;
}

.control-group {
    background: rgba(255,255,255,0.02);
    border-radius: 8px;
    padding: 10px 12px;
    border: 1px solid rgba(255,255,255,0.04);
    transition: all 0.2s;
}

.control-group:hover {
    background: rgba(255,255,255,0.04);
    border-color: rgba(255,255,255,0.08);
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #888;
    margin-bottom: 8px;
}

.control-group label span.value {
    color: #4ecca3;
    font-weight: 600;
    font-family: 'SF Mono', 'Consolas', monospace;
    font-size: 13px;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: rgba(255,255,255,0.08);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #4ecca3;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(78, 204, 163, 0.4);
    transition: transform 0.15s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    background: #1a1a24;
    color: #e0e0e0;
    border: 1px solid rgba(255,255,255,0.1);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

select:hover {
    background: #222230;
    border-color: rgba(255,255,255,0.2);
}

select:focus {
    border-color: #4ecca3;
    box-shadow: 0 0 0 2px rgba(78, 204, 163, 0.15);
}

select option {
    background: #1a1a24;
    color: #e0e0e0;
    padding: 10px;
    font-size: 13px;
}

select option:checked {
    background: #4ecca3;
    color: #000;
}

.constructor-preview {
    height: 140px;
    background: rgba(0,0,0,0.22);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 8px;
    overflow: hidden;
}

#constructor-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.preview-axis {
    stroke: rgba(255,255,255,0.10);
    stroke-width: 1;
}

.preview-body {
    stroke: rgba(255,255,255,0.28);
    stroke-width: 2;
    fill: none;
}

.preview-wing {
    fill: rgba(233,69,96,0.65);
    stroke: rgba(255,255,255,0.26);
    stroke-width: 1;
}

.preview-tail {
    fill: rgba(78,204,163,0.55);
    stroke: rgba(255,255,255,0.22);
    stroke-width: 1;
}

.preview-fin {
    fill: rgba(136,204,255,0.48);
    stroke: rgba(255,255,255,0.22);
    stroke-width: 1;
}

.preview-cg {
    fill: #ffd166;
    stroke: rgba(0,0,0,0.45);
    stroke-width: 1;
}

.preview-label {
    fill: #888;
    font-size: 9px;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.btn-row {
    display: flex;
    gap: 8px;
}

.segmented-control {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    padding: 3px;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
}

.segmented-control .segment {
    flex: none;
    padding: 8px 10px;
    border-radius: 6px;
    background: transparent;
    color: #888;
    box-shadow: none;
}

.segmented-control .segment.active {
    background: #4ecca3;
    color: #06110d;
}

.control-group.is-disabled {
    opacity: 0.35;
}

.control-group.is-disabled input {
    pointer-events: none;
}

button {
    flex: 1;
    padding: 10px 14px;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

button.primary {
    background: linear-gradient(135deg, #e94560, #d63850);
    color: white;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.3);
}

button.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(233, 69, 96, 0.4);
}

button.secondary {
    background: rgba(255,255,255,0.06);
    color: #aaa;
}

button.secondary:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

button.wide {
    width: 100%;
    flex: none;
}

button.icon-button {
    flex: none;
    width: 34px;
    height: 34px;
    padding: 0;
    font-size: 20px;
    line-height: 1;
}

button.accent {
    background: linear-gradient(135deg, #4ecca3, #3db892);
    color: #000;
    box-shadow: 0 4px 15px rgba(78, 204, 163, 0.25);
}

button.accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(78, 204, 163, 0.35);
}

.nav-button {
    display: block;
    width: 100%;
    margin-top: 4px;
    padding: 10px 14px;
    border-radius: 8px;
    background: rgba(255,255,255,0.06);
    color: #aaa;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: all 0.2s;
}

.nav-button:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
    transform: translateY(-2px);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.stats-panel {
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    padding: 14px;
    margin-top: auto;
    border: 1px solid rgba(255,255,255,0.05);
}

.stats-panel h3 {
    font-size: 11px;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-size: 12px;
    color: #666;
}

.stat-value {
    font-size: 14px;
    font-weight: 600;
    color: #4ecca3;
    font-family: 'SF Mono', 'Consolas', monospace;
}

#opt-status {
    font-size: 11px;
    color: #888;
    margin-top: 8px;
    line-height: 1.5;
    padding: 8px;
    background: rgba(78, 204, 163, 0.1);
    border-radius: 6px;
    display: none;
}

#opt-status.show {
    display: block;
}

.design-summary {
    font-size: 11px;
    color: #777;
    line-height: 1.45;
    padding: 0 2px 4px;
    font-family: 'SF Mono', 'Consolas', monospace;
}

#main-area {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background: #0a0a12;
}

.constructor-window {
    flex: none;
    height: 292px;
    border-top: 1px solid rgba(255,255,255,0.07);
    background: #101018;
}

.constructor-panel {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.constructor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.constructor-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin: 0;
}

.constructor-header span {
    display: block;
    color: #666;
    font-size: 11px;
    margin-top: 3px;
}

.constructor-layout {
    flex: 1;
    display: grid;
    grid-template-columns: 360px minmax(0, 1fr);
    gap: 12px;
    padding: 10px 14px 14px;
    overflow: hidden;
    min-height: 0;
}

.constructor-preview.large {
    height: 100%;
    min-height: 0;
}

.constructor-controls {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 10px;
    overflow-y: auto;
    padding-right: 4px;
}

/* 3D Container */
#scene-container {
    flex: 1;
    min-height: 0;
    position: relative;
    overflow: hidden;
    background: #0a0a12;
}

#scene-container canvas {
    display: block;
}

/* HUD */
.hud {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.hud-item {
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(10px);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 12px;
    color: #888;
    border: 1px solid rgba(255,255,255,0.05);
}

.hud-item strong {
    color: #4ecca3;
    font-weight: 600;
}

.hud-item strong.warning {
    color: #ff6b81;
}

/* Controls hint */
.controls-hint {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(10px);
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 11px;
    color: #555;
    border: 1px solid rgba(255,255,255,0.05);
}

.controls-hint span {
    color: #888;
}

@media (max-width: 900px) {
    .constructor-window {
        height: 420px;
    }
    .constructor-layout {
        grid-template-columns: 1fr;
        overflow-y: auto;
    }

    .constructor-controls {
        grid-template-columns: 1fr;
    }

    .constructor-preview.large {
        min-height: 260px;
    }
}