/*
 * Deep Space & Relativistic Observatory UI
 * Interstellar monospace aesthetic with ultra-dark obsidian tones and glassmorphism.
 */

:root {
    --bg-space: #000000;
    --text-primary: #e6edf3;
    --text-muted: #8b949e;
    --accent-cyan: #58a6ff;
    --accent-warning: #f0883e;
    --accent-danger: #f85149;
    --accent-success: #3fb950;
    --panel-bg: rgba(10, 12, 18, 0.68);
    --panel-border: rgba(255, 255, 255, 0.12);
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-space);
    font-family: var(--font-mono);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    user-select: none;
    -webkit-user-select: none;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: grab;
    touch-action: none;
}

#canvas-container.grabbing {
    cursor: grabbing;
}

#gl-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ==========================================================================
   HUD Overlay
   ========================================================================== */
#hud-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 24px 32px;
    z-index: 10;
    transition: opacity 0.3s ease;
}

#hud-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

/* Interactive elements inside HUD must enable pointer-events */
.interactive {
    pointer-events: auto;
}

/* Top Header */
.hud-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.mission-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mission-title .badge {
    font-size: 10px;
    letter-spacing: 1.5px;
    background: rgba(88, 166, 255, 0.15);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 3px 8px;
    border-radius: 3px;
    text-transform: uppercase;
}

.mission-title h1 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-primary);
    opacity: 0.9;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 11px;
    letter-spacing: 1px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-success);
    box-shadow: 0 0 10px var(--accent-success);
    transition: background-color 0.3s, box-shadow 0.3s;
}

.status-dot.infall {
    background-color: var(--accent-warning);
    box-shadow: 0 0 12px var(--accent-warning);
    animation: pulse 1s infinite alternate;
}

.status-dot.danger {
    background-color: var(--accent-danger);
    box-shadow: 0 0 16px var(--accent-danger);
    animation: pulse 0.4s infinite alternate;
}

@keyframes pulse {
    0% { opacity: 0.4; transform: scale(0.9); }
    100% { opacity: 1.0; transform: scale(1.2); }
}

/* Middle Layout: Reticle & Telemetry */
.hud-middle {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex: 1;
    pointer-events: none;
}

/* Telemetry Dashboard Panels */
.telemetry-card {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 6px;
    padding: 16px 20px;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card-title {
    font-size: 10px;
    letter-spacing: 1.8px;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 6px;
    display: flex;
    justify-content: space-between;
}

.metric-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: 11px;
}

.metric-label {
    color: var(--text-muted);
    letter-spacing: 0.8px;
}

.metric-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.metric-value.highlight {
    color: var(--accent-cyan);
}

.metric-value.warning {
    color: var(--accent-warning);
}

.metric-value.danger {
    color: var(--accent-danger);
}

/* Primary Central Interactive Hint */
.interactive-prompt {
    position: absolute;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    background: rgba(10, 12, 18, 0.75);
    border: 1px solid rgba(88, 166, 255, 0.35);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.6);
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #fff;
    cursor: pointer;
    transition: opacity 0.4s ease, transform 0.2s ease, border-color 0.3s;
    animation: glow-pulse 2.5s infinite;
}

.interactive-prompt:hover {
    border-color: var(--accent-cyan);
    transform: translateX(-50%) scale(1.03);
}

@keyframes glow-pulse {
    0%, 100% { box-shadow: 0 0 10px rgba(88, 166, 255, 0.2); }
    50% { box-shadow: 0 0 22px rgba(88, 166, 255, 0.5); }
}

/* Bottom Controls */
.hud-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.bottom-info {
    font-size: 10px;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.hud-actions {
    display: flex;
    gap: 10px;
}

.btn-telemetry {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 1px;
    padding: 8px 14px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-telemetry:hover {
    background: rgba(30, 36, 50, 0.85);
    border-color: rgba(255, 255, 255, 0.25);
    color: #fff;
}

.btn-telemetry.primary {
    border-color: rgba(88, 166, 255, 0.4);
    color: var(--accent-cyan);
}

.btn-telemetry.primary:hover {
    background: rgba(88, 166, 255, 0.15);
    border-color: var(--accent-cyan);
}

.btn-telemetry.danger {
    border-color: rgba(248, 81, 73, 0.4);
    color: var(--accent-danger);
}

.btn-telemetry.danger:hover {
    background: rgba(248, 81, 73, 0.15);
    border-color: var(--accent-danger);
}

/* ==========================================================================
   Singularity Alert Banner
   ========================================================================== */
#singularity-modal {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(6, 7, 10, 0.92);
    border: 1px solid rgba(248, 81, 73, 0.5);
    box-shadow: 0 0 50px rgba(248, 81, 73, 0.35);
    padding: 36px 44px;
    border-radius: 8px;
    text-align: center;
    max-width: 480px;
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    z-index: 100;
}

#singularity-modal.visible {
    display: flex;
    animation: modal-appear 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-appear {
    from { opacity: 0; transform: translate(-50%, -46%) scale(0.95); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1.0); }
}

#singularity-modal h2 {
    font-size: 18px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-danger);
}

#singularity-modal p {
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-muted);
}

/* ==========================================================================
   Settings Drawer / Dialog
   ========================================================================== */
#settings-drawer {
    position: absolute;
    top: 24px;
    right: 32px;
    background: rgba(10, 13, 20, 0.94);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 8px;
    padding: 24px;
    width: 320px;
    display: none;
    flex-direction: column;
    gap: 18px;
    z-index: 50;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8);
}

#settings-drawer.open {
    display: flex;
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 10px;
}

.drawer-header h3 {
    font-size: 12px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    cursor: pointer;
}

.close-btn:hover {
    color: #fff;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-label-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-cyan);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 840px) {
    #hud-overlay {
        padding: 16px;
    }
    .telemetry-card {
        min-width: 210px;
        padding: 12px 14px;
    }
    .mission-title h1 {
        font-size: 11px;
    }
    .interactive-prompt {
        bottom: 80px;
        font-size: 10px;
        padding: 8px 16px;
    }
}

@media (max-width: 600px) {
    .telemetry-card.secondary {
        display: none;
    }
    .bottom-info {
        display: none;
    }
}