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

body {
    font-family: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
    background: #f5ede3;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.simulator-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    background: #f5ede3;
    overflow: hidden;
}

.canvas-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: var(--panel-height, 0px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: bottom 0.35s ease;
}

canvas {
    display: block;
    max-width: 80%;
    max-height: 80%;
    width: auto;
    height: auto;
    aspect-ratio: 1280 / 760;
    border-radius: 1.5rem;
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.7), inset 0 0 0 1px rgba(255, 255, 255, 0.15);
    background: transparent;
}

/* ── Design tokens ── */
:root {
    --panel-bg: rgba(255, 252, 249, 0.96);
    --panel-border: rgba(0, 0, 0, 0.08);
    --panel-shadow: 0 -1px 0 rgba(0,0,0,0.06), 0 -8px 32px rgba(0,0,0,0.08);
    --text-primary: #1a1a1a;
    --text-muted: #6b7280;
    --text-label: #374151;
    --accent: #d97706;
    --accent-light: #fef3c7;
    --track-bg: #e5e7eb;
    --track-fill: #d97706;
    --thumb-bg: #ffffff;
    --btn-bg: #f3f4f6;
    --btn-border: #e5e7eb;
    --btn-hover: #e9eaec;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
}

/* === Desktop left sidebar (≥751px) === */
@media (min-width: 751px) {
    .controls-area {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    display: flex;
    align-items: flex-start;
    pointer-events: none;
    }

    .controls-toggle {
    position: relative;
    z-index: 102;
    pointer-events: all;
    width: 28px;
    height: 48px;
    margin-top: 50vh;
    transform: translateY(-50%);
    border: 1px solid var(--panel-border);
    border-left: none;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: var(--panel-bg);
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    backdrop-filter: blur(20px);
    transition: background 0.2s, color 0.2s;
    user-select: none;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 2px 0 8px rgba(0,0,0,0.06);
    }
    .controls-toggle:hover {
    background: #fff;
    color: var(--text-primary);
    }

    .controls-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 256px;
    height: 100vh;
    z-index: 101;
    background: var(--panel-bg);
    backdrop-filter: blur(24px);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    pointer-events: all;
    border-right: 1px solid var(--panel-border);
    box-shadow: 4px 0 24px rgba(0,0,0,0.07);
    }
    .controls-panel.open {
    transform: translateX(0);
    }

    .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.1rem 0.9rem;
    border-bottom: 1px solid var(--panel-border);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    flex-shrink: 0;
    }
    .sidebar-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    line-height: 1;
    transition: background 0.15s, color 0.15s;
    }
    .sidebar-close:hover {
    background: var(--btn-bg);
    color: var(--text-primary);
    }

    .controls-grid {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0 1rem;
    overflow-y: auto;
    flex: 1;
    }
    .controls-grid .control-group {
    flex: none;
    width: 100%;
    padding: 0.65rem 1.1rem;
    border-bottom: 1px solid var(--panel-border);
    }
    .controls-grid .control-group:last-of-type {
    border-bottom: none;
    }
    .controls-grid .buttons-cell {
    padding: 0.8rem 1.1rem 0.4rem;
    margin-top: 0;
    border-bottom: none;
    }
    .buttons-cell {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    }
    .pill-row {
    display: flex;
    gap: 0.4rem;
    width: 100%;
    }
    .pill-row .pill {
    flex: 1;
    }
}

/* === Mobile bottom panel (≤750px) === */
@media (max-width: 750px) {
    .controls-area {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
    }

    .controls-toggle {
    width: 100%;
    padding: 7px 0 9px;
    text-align: center;
    cursor: pointer;
    background: var(--panel-bg);
    border: none;
    border-top: 1px solid var(--panel-border);
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    backdrop-filter: blur(20px);
    transition: background 0.2s, color 0.2s;
    user-select: none;
    position: relative;
    z-index: 2;
    box-shadow: var(--panel-shadow);
    }
    .controls-toggle:hover {
    background: #fff;
    color: var(--text-primary);
    }

    .controls-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    padding: 0 1rem;
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--panel-border);
    }
    .controls-panel.open {
    max-height: 520px;
    padding: 1rem 1rem 0.8rem;
    }

    .sidebar-header, .sidebar-close {
    display: none;
    }

    .controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem 1.2rem;
    }
    .controls-grid .control-group {
    padding-bottom: 0;
    border-bottom: none;
    }
    .controls-grid .buttons-cell {
    padding-bottom: 0;
    border-bottom: none;
    }
    .buttons-cell {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    }
    .pill-row {
    display: flex;
    gap: 0.35rem;
    width: 100%;
    }
    .pill-row .pill {
    flex: 1;
    font-size: 0.72rem;
    padding: 0.42rem 0.4rem;
    white-space: nowrap;
    }
}

/* ── Shared pill / button styles ── */
.pill-row {
    display: flex;
    gap: 0.4rem;
    width: 100%;
}
.pill-row .pill { flex: 1; }

.pill {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.38rem 0.7rem;
    border-radius: var(--radius-md);
    font-size: 0.76rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--text-label);
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    letter-spacing: 0.1px;
    min-width: 0;
    white-space: nowrap;
}
.pill:hover {
    background: var(--btn-hover);
    border-color: #d1d5db;
    color: var(--text-primary);
}
.pill:active {
    background: #e5e7eb;
}

/* Color picker pill */
.color-pill {
    gap: 0.4rem;
}
.color-pill input[type="color"] {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1.5px solid #d1d5db;
    padding: 0;
    cursor: pointer;
    background: transparent;
    flex-shrink: 0;
}
.color-pill input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-pill input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
}

/* ── Control group ── */
.control-group {
    flex: 1 1 200px;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.control-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    color: var(--text-label);
    font-size: 0.76rem;
    letter-spacing: 0.2px;
    padding: 0;
    background: none;
    border-radius: 0;
}

.value-badge {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--accent);
    background: none;
    padding: 0;
    min-width: 2.4rem;
    text-align: right;
    box-shadow: none;
    font-variant-numeric: tabular-nums;
}

/* ── Range slider ── */
input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--track-bg);
    border-radius: 99px;
    outline: none;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--thumb-bg);
    border-radius: 50%;
    border: 2px solid var(--accent);
    box-shadow: 0 1px 4px rgba(0,0,0,0.18);
    transition: transform 0.15s, box-shadow 0.15s;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(217,119,6,0.3);
}
input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--thumb-bg);
    border-radius: 50%;
    border: 2px solid var(--accent);
    box-shadow: 0 1px 4px rgba(0,0,0,0.18);
    cursor: pointer;
}