/* ============================================================
   STARDANCE — Gravity Simulator Styles
   ============================================================ */

/* ---- Reset & Base ---- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #8B5CF6;
    --primary-dark: #7C3AED;
    --primary-light: #A78BFA;
    --secondary: #EC4899;
    --accent: #06B6D4;
    --bg-dark: #0A0520;
    --bg-panel: rgba(10, 5, 30, 0.92);
    --text-primary: #FFFFFF;
    --text-secondary: #C4B5FD;
    --text-muted: #6D6480;
    --border-color: rgba(139, 92, 246, 0.2);
    --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.1);
    --radius: 12px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background: #000;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    height: 100vh;
    width: 100vw;
    user-select: none;
}

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#app {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

/* ---- Sidebar ---- */
#sidebar {
    position: fixed;
    top: 16px;
    left: 16px;
    width: 300px;
    max-height: calc(100vh - 32px);
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px 18px;
    pointer-events: auto;
    overflow-y: auto;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.7), var(--shadow-glow);
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

#sidebar::-webkit-scrollbar {
    width: 4px;
}

#sidebar::-webkit-scrollbar-track {
    background: transparent;
}

#sidebar::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 2px;
}

/* ---- Sidebar Header ---- */
.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-family: 'Orbitron', monospace;
    font-weight: 900;
    font-size: 18px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}

.version {
    font-size: 10px;
    color: var(--text-muted);
    padding: 2px 8px;
    background: rgba(139, 92, 246, 0.15);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

/* ---- Dashboard Stats ---- */
.dashboard-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 12px;
    padding: 10px 12px;
    background: rgba(139, 92, 246, 0.05);
    border-radius: 8px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.stat-row span:last-child {
    color: var(--text-primary);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* ---- Control Groups ---- */
.control-group {
    margin-bottom: 14px;
}

.control-group label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 5px;
    letter-spacing: 0.3px;
}

.control-group label span {
    color: var(--primary-light);
    font-weight: 700;
}

/* ---- Range Sliders ---- */
input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(139, 92, 246, 0.2);
    border-radius: 2px;
    outline: none;
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.4);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.6);
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}

/* ---- Button Grids ---- */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 5px;
}

.toggle-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
}

/* ---- Buttons ---- */
.preset-btn,
.action-btn,
.toggle-btn {
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    letter-spacing: 0.3px;
    background: rgba(139, 92, 246, 0.08);
    color: var(--text-secondary);
    pointer-events: auto;
    white-space: nowrap;
}

.preset-btn:hover,
.action-btn:hover,
.toggle-btn:hover {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--primary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.preset-btn.active {
    background: var(--primary) !important;
    border-color: var(--primary-light) !important;
    color: #fff !important;
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.3);
}

.toggle-btn.active {
    background: rgba(139, 92, 246, 0.4) !important;
    border-color: var(--primary-light) !important;
    color: var(--text-primary) !important;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.2);
}

.action-btn.primary {
    background: rgba(139, 92, 246, 0.25);
    border-color: var(--primary);
    color: var(--primary-light);
}

.action-btn.danger {
    border-color: rgba(239, 68, 68, 0.3);
    color: #F87171;
}

.action-btn.danger:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: #EF4444;
}

.action-btn.danger-heavy {
    border-color: rgba(239, 68, 68, 0.5);
    color: #EF4444;
}

.action-btn.danger-heavy:hover {
    background: rgba(239, 68, 68, 0.25);
    border-color: #EF4444;
}

/* ---- Inspector ---- */
.inspector-panel {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.inspector-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.inspector-content {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 6px;
    padding: 8px 10px;
}

.inspector-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.inspector-row span:last-child {
    color: var(--text-primary);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

/* ---- Shortcuts ---- */
.shortcuts {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.shortcut-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 10px;
    color: var(--text-muted);
    line-height: 1.8;
}

.shortcut-row kbd {
    display: inline-block;
    padding: 1px 6px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    font-family: 'Inter', monospace;
    font-size: 9px;
    color: var(--text-secondary);
    min-width: 30px;
    text-align: center;
}

/* ---- Loading Screen ---- */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-dark);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 999;
    transition: opacity 0.6s ease;
}

#loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(139, 92, 246, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#loading-screen p {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-secondary);
    font-family: 'Orbitron', monospace;
    letter-spacing: 2px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    #sidebar {
        top: 10px;
        left: 10px;
        right: 10px;
        width: auto;
        max-height: 45vh;
        padding: 14px 12px;
    }

    .sidebar-header .logo {
        font-size: 15px;
    }

    .dashboard-stats {
        grid-template-columns: 1fr 1fr;
        padding: 6px 10px;
    }

    .stat-row {
        font-size: 10px;
    }

    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .action-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .toggle-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .preset-btn,
    .action-btn,
    .toggle-btn {
        font-size: 9px;
        padding: 4px 6px;
    }
}

@media (max-width: 480px) {
    #sidebar {
        top: 6px;
        left: 6px;
        right: 6px;
        max-height: 40vh;
        padding: 10px 10px;
        border-radius: 8px;
    }

    .sidebar-header {
        margin-bottom: 10px;
        padding-bottom: 8px;
    }

    .sidebar-header .logo {
        font-size: 13px;
    }

    .control-group {
        margin-bottom: 8px;
    }

    .dashboard-stats {
        grid-template-columns: 1fr 1fr;
        gap: 2px 8px;
        padding: 4px 8px;
        margin-bottom: 10px;
    }

    .stat-row {
        font-size: 9px;
        line-height: 1.4;
    }

    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 3px;
    }

    .action-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 3px;
    }

    .toggle-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 3px;
    }

    .preset-btn,
    .action-btn,
    .toggle-btn {
        font-size: 8px;
        padding: 3px 4px;
        border-radius: 4px;
    }

    .inspector-panel {
        margin-top: 8px;
        padding-top: 8px;
    }

    .inspector-row {
        font-size: 9px;
        line-height: 1.6;
    }

    .shortcuts {
        display: none;
    }

    input[type="range"] {
        height: 3px;
    }

    input[type="range"]::-webkit-slider-thumb {
        width: 12px;
        height: 12px;
    }
}