/* ─── Reset & Base ──────────────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { overflow: hidden; background: #000; font-family: 'Segoe UI', Arial, sans-serif; color: #fff; }
canvas { display: block; }

/* ─── Loading Screen ───────────────────────────────────────────────────── */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, #0a0a1a 0%, #000 80%);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease;
}
#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}
.loading-content {
    text-align: center;
}
.loading-title {
    font-size: 32px;
    font-weight: 200;
    letter-spacing: 12px;
    text-transform: uppercase;
    text-shadow: 0 0 40px rgba(100, 180, 255, 0.4);
    margin-bottom: 40px;
}
.loading-bar {
    width: 260px;
    height: 3px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto 16px;
}
.loading-bar-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, #4a9eff, #88ccff);
    border-radius: 2px;
    transition: width 0.3s ease;
}
.loading-text {
    font-size: 12px;
    opacity: 0.5;
    letter-spacing: 1px;
}

/* ─── Sidebar ───────────────────────────────────────────────────────────── */
#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100%;
    background: rgba(5, 8, 18, 0.88);
    backdrop-filter: blur(12px);
    border-right: 1px solid rgba(255,255,255,0.08);
    z-index: 20;
    overflow-y: auto;
    transition: transform 0.3s ease;
    padding-bottom: 20px;
}
#sidebar.collapsed { transform: translateX(-260px); }

#sidebar-toggle {
    position: fixed;
    top: 14px;
    left: 268px;
    z-index: 21;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: left 0.3s ease, background 0.2s;
}
#sidebar-toggle:hover { background: rgba(255,255,255,0.15); }
#sidebar.collapsed ~ #sidebar-toggle { left: 8px; }

#sidebar-header {
    padding: 18px 18px 10px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
#sidebar-header h1 {
    font-size: 18px;
    font-weight: 300;
    letter-spacing: 4px;
    text-transform: uppercase;
    text-shadow: 0 0 20px rgba(100, 180, 255, 0.5);
}

/* Sidebar sections */
.sidebar-section {
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-section-header {
    padding: 10px 18px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255,255,255,0.4);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}
.sidebar-section-header:hover { color: rgba(255,255,255,0.6); }
.sidebar-section-header .arrow {
    font-size: 10px;
    transition: transform 0.2s;
}
.sidebar-section.collapsed .arrow { transform: rotate(-90deg); }
.sidebar-section.collapsed .sidebar-section-content { display: none; }

.sidebar-section-content {
    padding: 4px 18px 12px;
    display: flex;
    flex-direction: column;
    gap: 7px;
}

/* Sidebar controls */
.ctrl-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}
.ctrl-row label {
    display: flex;
    align-items: center;
    gap: 6px;
    opacity: 0.85;
    cursor: pointer;
    font-size: 13px;
}
.ctrl-row input[type="range"] {
    width: 100px;
    accent-color: #4a9eff;
    flex: 1;
}
.ctrl-row input[type="checkbox"] {
    accent-color: #4a9eff;
}
.ctrl-row select {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    color: #fff;
    padding: 3px 6px;
    border-radius: 4px;
    font-size: 12px;
    flex: 1;
}
.ctrl-row select option {
    background: #111;
    color: #fff;
}

.ctrl-label {
    font-size: 12px;
    opacity: 0.6;
    min-width: 50px;
}

.sidebar-btn {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.12);
    color: #fff;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
    width: fit-content;
}
.sidebar-btn:hover { background: rgba(255,255,255,0.15); }
.sidebar-btn.active {
    background: rgba(74, 158, 255, 0.25);
    border-color: rgba(74, 158, 255, 0.5);
}

/* ─── Search Bar ────────────────────────────────────────────────────────── */
#search-container {
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 25;
    display: none;
}
#search-container.visible { display: block; }

#search-input {
    background: rgba(5, 8, 18, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(74, 158, 255, 0.4);
    color: #fff;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    width: 300px;
    outline: none;
}
#search-input::placeholder { color: rgba(255,255,255,0.3); }

#search-results {
    background: rgba(5, 8, 18, 0.95);
    border: 1px solid rgba(255,255,255,0.1);
    border-top: none;
    border-radius: 0 0 8px 8px;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}
#search-results.visible { display: block; }
.search-result-item {
    padding: 8px 16px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s;
}
.search-result-item:hover {
    background: rgba(74, 158, 255, 0.15);
}

/* ─── Time HUD ──────────────────────────────────────────────────────────── */
#time-hud {
    position: fixed;
    top: 14px;
    right: 20px;
    z-index: 15;
    text-align: right;
    font-size: 12px;
    opacity: 0.6;
    pointer-events: none;
}
#time-hud .date { font-size: 14px; opacity: 1; }
#time-hud .distance { font-size: 11px; opacity: 0.7; margin-top: 3px; }

/* ─── Hover Tooltip ─────────────────────────────────────────────────────── */
#hover-tooltip {
    position: fixed;
    z-index: 30;
    background: rgba(5, 8, 18, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(74, 158, 255, 0.3);
    color: #cde;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
    white-space: nowrap;
}
#hover-tooltip.visible {
    opacity: 1;
}

/* ─── Planet Info (bottom bar — legacy) ──────────────────────────────────── */
#planet-info {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px;
    padding: 16px 28px;
    color: #fff;
    z-index: 10;
    text-align: center;
    display: none;
    min-width: 240px;
}
#planet-info h2 { font-size: 20px; font-weight: 400; margin-bottom: 6px; }
#planet-info p { font-size: 13px; opacity: 0.7; line-height: 1.5; }

/* ─── Detail Panel (right side) ─────────────────────────────────────────── */
#detail-panel {
    position: fixed;
    top: 0;
    right: -380px;
    width: 370px;
    height: 100%;
    background: rgba(5, 8, 18, 0.92);
    backdrop-filter: blur(14px);
    border-left: 1px solid rgba(255,255,255,0.08);
    z-index: 22;
    overflow-y: auto;
    transition: right 0.35s ease;
    padding: 0;
}
#detail-panel.open { right: 0; }

#detail-panel-close {
    position: absolute;
    top: 14px;
    right: 14px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    color: #fff;
    width: 26px;
    height: 26px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}
#detail-panel-close:hover { background: rgba(255,255,255,0.15); }

#detail-header {
    padding: 28px 24px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
#detail-header h2 {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 2px;
}
#detail-header .subtitle {
    font-size: 12px;
    opacity: 0.5;
    margin-top: 4px;
}

/* Detail tabs */
.detail-tabs {
    display: flex;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.detail-tab {
    flex: 1;
    padding: 10px 8px;
    text-align: center;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.5px;
    cursor: pointer;
    opacity: 0.5;
    border-bottom: 2px solid transparent;
    transition: opacity 0.2s, border-color 0.2s;
}
.detail-tab:hover { opacity: 0.7; }
.detail-tab.active {
    opacity: 1;
    border-bottom-color: #4a9eff;
}

.detail-content {
    padding: 16px 24px 24px;
}
.detail-tab-panel { display: none; }
.detail-tab-panel.active { display: block; }

.detail-tab-panel p {
    font-size: 13px;
    line-height: 1.7;
    opacity: 0.8;
    margin-bottom: 12px;
}
.detail-tab-panel .fun-fact {
    background: rgba(74, 158, 255, 0.08);
    border-left: 3px solid rgba(74, 158, 255, 0.4);
    padding: 10px 14px;
    border-radius: 0 6px 6px 0;
    font-size: 12px;
    opacity: 0.9;
    margin-top: 8px;
}

/* Stats table */
.stats-table {
    width: 100%;
    font-size: 12px;
    border-collapse: collapse;
}
.stats-table tr {
    border-bottom: 1px solid rgba(255,255,255,0.04);
}
.stats-table td {
    padding: 7px 0;
}
.stats-table td:first-child {
    opacity: 0.5;
    padding-right: 12px;
    white-space: nowrap;
}
.stats-table td:last-child {
    text-align: right;
    opacity: 0.85;
}

/* Moons list */
.moon-item {
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    font-size: 13px;
}
.moon-item .moon-name { font-weight: 500; }
.moon-item .moon-info { font-size: 11px; opacity: 0.5; margin-top: 2px; }

/* Detail action buttons */
.detail-actions {
    display: flex;
    gap: 8px;
    padding: 12px 24px 16px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.detail-action-btn {
    flex: 1;
    background: rgba(74, 158, 255, 0.12);
    border: 1px solid rgba(74, 158, 255, 0.3);
    color: #7bb8ff;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    text-align: center;
    transition: background 0.2s;
}
.detail-action-btn:hover {
    background: rgba(74, 158, 255, 0.25);
}

/* ─── Tour Overlay ──────────────────────────────────────────────────────── */
#tour-overlay {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 28;
    display: none;
    pointer-events: auto;
}
#tour-overlay.visible {
    display: block;
}
.tour-card {
    background: rgba(5, 8, 18, 0.9);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(74, 158, 255, 0.2);
    border-radius: 12px;
    padding: 20px 24px;
    min-width: 380px;
    max-width: 480px;
}
.tour-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
.tour-header h3 {
    font-size: 18px;
    font-weight: 400;
    letter-spacing: 1px;
}
#tour-count {
    font-size: 11px;
    opacity: 0.5;
}
#tour-text {
    font-size: 13px;
    line-height: 1.7;
    opacity: 0.8;
    margin-bottom: 16px;
}
.tour-controls {
    display: flex;
    gap: 8px;
}
.tour-btn {
    flex: 1;
    background: rgba(74, 158, 255, 0.1);
    border: 1px solid rgba(74, 158, 255, 0.25);
    color: #7bb8ff;
    padding: 6px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.2s;
}
.tour-btn:hover { background: rgba(74, 158, 255, 0.2); }
.tour-btn:disabled { opacity: 0.3; cursor: default; }
.tour-btn-end {
    background: rgba(255, 100, 100, 0.08);
    border-color: rgba(255, 100, 100, 0.2);
    color: #ff8888;
}
.tour-btn-end:hover { background: rgba(255, 100, 100, 0.15); }

/* ─── Keyboard Shortcuts Overlay ────────────────────────────────────────── */
#shortcuts-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 50;
    display: none;
    align-items: center;
    justify-content: center;
}
#shortcuts-overlay.visible {
    display: flex;
}
.shortcuts-card {
    background: rgba(5, 8, 18, 0.95);
    border: 1px solid rgba(74, 158, 255, 0.2);
    border-radius: 12px;
    padding: 28px 32px;
    min-width: 340px;
}
.shortcuts-card h3 {
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 20px;
    opacity: 0.8;
}
.shortcut-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 24px;
}
.shortcut-item {
    font-size: 12px;
    opacity: 0.7;
    display: flex;
    align-items: center;
    gap: 8px;
}
.shortcut-item kbd,
.shortcuts-hint kbd {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 3px;
    padding: 1px 6px;
    font-size: 11px;
    font-family: 'Segoe UI', monospace;
    color: #aabbcc;
    min-width: 22px;
    text-align: center;
}
.shortcuts-hint {
    margin-top: 18px;
    font-size: 11px;
    opacity: 0.4;
    text-align: center;
}

/* ─── Minimap ───────────────────────────────────────────────────────────── */
#minimap-container {
    position: fixed;
    bottom: 16px;
    right: 16px;
    width: 200px;
    height: 200px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 8px;
    overflow: hidden;
    z-index: 15;
    background: rgba(0,0,0,0.4);
    transition: opacity 0.5s ease;
}
#minimap-container canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ─── Comparison Overlay ────────────────────────────────────────────────── */
#comparison-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.92);
    z-index: 30;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
#comparison-overlay.visible {
    display: flex;
}
#comparison-close {
    position: absolute;
    top: 20px;
    right: 24px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    color: #fff;
    padding: 6px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    z-index: 31;
}
#comparison-close:hover { background: rgba(255,255,255,0.15); }
#comparison-title {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 18px;
    font-weight: 300;
    letter-spacing: 3px;
    text-transform: uppercase;
    opacity: 0.7;
}
#comparison-canvas-container {
    width: 90%;
    height: 60%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ─── Hint ──────────────────────────────────────────────────────────────── */
#hint {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.3);
    font-size: 12px;
    z-index: 10;
    pointer-events: none;
    white-space: nowrap;
}
#hint b {
    color: rgba(255,255,255,0.5);
    font-weight: 600;
}

/* ─── Scrollbar ─────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ─── Mobile Responsive ────────────────────────────────────────────────── */
@media (max-width: 768px) {
    #sidebar {
        width: 220px;
    }
    #sidebar.collapsed ~ #sidebar-toggle { left: 8px; }
    #sidebar-toggle { left: 228px; }

    #detail-panel {
        width: 100%;
        right: -100%;
    }

    #minimap-container {
        width: 140px;
        height: 140px;
        bottom: 8px;
        right: 8px;
    }

    .tour-card {
        min-width: 280px;
        max-width: 90vw;
    }

    #hint {
        font-size: 10px;
        white-space: normal;
        text-align: center;
        max-width: 90vw;
    }

    .shortcuts-card {
        min-width: 280px;
        max-width: 90vw;
    }
    .shortcut-grid {
        grid-template-columns: 1fr;
    }
}