:root {
    --primary: #38bdf8;
    --primary-hover: #0284c7;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    --bg-dark: #050711;
    --panel-bg: rgba(15, 23, 42, 0.85);
    --panel-border: rgba(56, 189, 248, 0.25);
    --text: #f8fafc;
    --text-muted: #94a3b8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    user-select: none;
}

body {
    background-color: var(--bg-dark);
    color: var(--text);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
}

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

/* Header Bar */
.header-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: linear-gradient(180deg, rgba(5, 7, 17, 0.95) 0%, rgba(5, 7, 17, 0) 100%);
    pointer-events: auto;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-title {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.btn {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--panel-border);
    color: var(--text);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(8px);
}

.btn:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.btn-primary {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.3), rgba(99, 102, 241, 0.3));
    border-color: var(--primary);
    color: #38bdf8;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.5);
    color: #f87171;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.4);
}

/* Floating HUD Panels */
.hud-panel {
    position: absolute;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    padding: 16px 20px;
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 10;
    pointer-events: auto;
}

/* Top Countdown HUD */
.countdown-hud {
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    min-width: 320px;
    border-color: rgba(239, 68, 68, 0.4);
    animation: pulseGlow 3s infinite alternate;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 15px rgba(239, 68, 68, 0.2); }
    100% { box-shadow: 0 0 25px rgba(239, 68, 68, 0.45); }
}

.countdown-timer {
    font-size: 1.6rem;
    font-weight: 800;
    font-family: "SFMono-Regular", Consolas, monospace;
    color: #ef4444;
    margin: 6px 0;
    letter-spacing: 1px;
}

/* Left Sidebar (Asteroid Info) */
.left-hud {
    top: 150px;
    left: 20px;
    width: 320px;
    max-height: calc(100vh - 180px);
    overflow-y: auto;
}

.hud-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 12px;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hud-metric {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 8px;
    padding: 4px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.hud-label {
    color: var(--text-muted);
}

.hud-value {
    font-weight: 700;
    color: #f8fafc;
}

/* Right Sidebar (Lists) */
.right-hud {
    top: 70px;
    right: 20px;
    width: 300px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.ast-card {
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    padding: 10px 12px;
    margin-bottom: 8px;
    cursor: pointer !important;
    pointer-events: auto !important;
    position: relative;
    z-index: 20;
    transition: all 0.2s;
}

.ast-card:hover {
    background: rgba(56, 189, 248, 0.2);
    border-color: var(--primary);
    transform: translateX(-3px);
}

.ast-card:active {
    transform: scale(0.98);
}

.ast-card.active {
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.3), rgba(99, 102, 241, 0.3));
    border-color: var(--primary);
    box-shadow: 0 0 16px rgba(56, 189, 248, 0.45);
    transform: translateX(-4px);
}

.badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

/* Bottom Control Dock */
.bottom-dock {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
    pointer-events: auto;
}

/* Modal Windows */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-card {
    background: #0f172a;
    border: 1px solid var(--primary);
    border-radius: 14px;
    width: 90%;
    max-width: 580px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 28px;
    box-shadow: 0 10px 40px rgba(56, 189, 248, 0.25);
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    background: #1e293b;
    border: 1px solid #334155;
    color: #f8fafc;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
}

.calc-results-box {
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    padding: 16px;
    margin-top: 18px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .left-hud, .right-hud {
        display: none;
    }
    .countdown-hud {
        top: 60px;
        width: 90%;
    }
}