:root {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --accent-color: #4CAF50;
    --panel-bg: rgba(20, 20, 20, 0.85);
    --icon-color: #fff;
}

body.light-mode {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --accent-color: #2E7D32;
    /* Darker green */
    --panel-bg: rgba(255, 255, 255, 0.85);
    --icon-color: #1a1a1a;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

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

#ui-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 280px;
    background-color: var(--panel-bg);
    padding: 20px;
    border-radius: 12px;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 15px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#ui-overlay.collapsed {
    transform: translateX(calc(100% + 20px));
}

.ui-toggle-btn {
    position: absolute;
    top: 50%;
    left: -30px;
    transform: translateY(-50%);
    width: 30px;
    height: 48px;
    background: var(--panel-bg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-right: none;
    border-radius: 8px 0 0 8px;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: -4px 0 10px rgba(0, 0, 0, 0.2);
    z-index: -1;
    transition: background 0.3s, color 0.3s;
    backdrop-filter: blur(8px);
}

body.light-mode .ui-toggle-btn {
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: -4px 0 10px rgba(0, 0, 0, 0.1);
}

.ui-toggle-btn:hover {
    background: var(--accent-color);
    color: #fff;
}

.toggle-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#ui-overlay.collapsed .toggle-icon {
    transform: rotate(180deg);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label:not(.toggle-switch) {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-color);
}

/* Range input styling */
input[type=range] {
    width: 100%;
    background: transparent;
    -webkit-appearance: none;
    appearance: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    background: #444;
    border-radius: 3px;
}

input[type=range]::-webkit-slider-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--text-color);
    margin-top: -5px;
    cursor: pointer;
    -webkit-appearance: none;
}

/* Toggle Switch */
.toggle-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    justify-content: space-between;
}

.toggle-switch input {
    display: none;
}

.toggle-switch .slider {
    position: relative;
    width: 40px;
    height: 20px;
    background-color: #555;
    border-radius: 20px;
    transition: 0.3s;
}

.toggle-switch .slider:before {
    content: "";
    position: absolute;
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    border-radius: 50%;
    transition: 0.3s;
}

.toggle-switch input:checked+.slider {
    background-color: var(--accent-color);
}

.toggle-switch input:checked+.slider:before {
    transform: translateX(20px);
}

.label-text {
    flex-grow: 1;
    margin-left: 10px;
    font-size: 0.9em;
    font-weight: 500;
}

.sub-panel {
    background: var(--panel-bg);
    padding: 10px;
    border-radius: 8px;
    margin-top: 5px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-left: 3px solid var(--accent-color);
}

#loading-indicator {
    font-style: italic;
    color: var(--accent-color);
    font-size: 0.9em;
    text-align: center;
    margin-top: 10px;
}

.theme-toggle-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 20;
    /* background: var(--panel-bg); */
    background: none;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, background-color 0.3s;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
}

.theme-toggle-btn svg {
    width: 24px;
    height: 24px;
    fill: var(--icon-color);
    transition: fill 0.3s;
}

.control-group label:not(.toggle-switch) {
    font-size: 0.9em;
    font-weight: 600;
    color: var(--text-color);
}

.slider-with-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.step-btn {
    background: rgba(128, 128, 128, 0.2);
    border: 1px solid rgba(128, 128, 128, 0.3);
    color: var(--text-color);
    font-size: 1.2em;
    font-weight: bold;
    border-radius: 4px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.step-btn:hover {
    background: var(--accent-color);
    color: #fff;
}

.step-btn:active {
    transform: scale(0.9);
}

.spinner-btn {
    background: rgba(128, 128, 128, 0.2);
    border: 1px solid rgba(128, 128, 128, 0.3);
    color: var(--text-color);
    font-weight: bold;
    border-radius: 4px;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-size: 1.0em;
}

.spinner-btn:hover {
    background: var(--accent-color);
    color: #ffffff;
}

.spinner-btn:active {
    transform: scale(0.9);
}

/* Color Palette Popup */
#color-palette-popup {
    position: absolute;
    z-index: 1000;
    background: var(--panel-bg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    pointer-events: auto;
    width: 200px;
    transform: translate(-50%, -110%);
}

.palette-header {
    font-size: 12px;
    color: var(--text-color);
    text-align: center;
    margin-bottom: 8px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.color-swatch {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
    padding: 0;
}

.color-swatch:hover {
    transform: scale(1.2);
    border-color: #ffffff;
    box-shadow: 0 0 10px currentColor;
}

.color-swatch:active {
    transform: scale(0.9);
}

.remove-highlight-btn {
    width: 100%;
    margin-top: 10px;
    padding: 6px;
    background: rgba(255, 0, 0, 0.2);
    border: 1px solid rgba(255, 0, 0, 0.5);
    color: #ffcccc;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    font-weight: bold;
    text-transform: uppercase;
    transition: background 0.2s, color 0.2s;
}

.remove-highlight-btn:hover {
    background: rgba(255, 0, 0, 0.6);
    color: #ffffff;
}

.follow-astro-btn {
    width: 100%;
    margin-top: 10px;
    padding: 6px;
    background: rgba(30, 144, 255, 0.2);
    border: 1px solid rgba(30, 144, 255, 0.5);
    color: #cce0ff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 11px;
    font-weight: bold;
    text-transform: uppercase;
    transition: background 0.2s, color 0.2s;
}

.follow-astro-btn:hover {
    background: rgba(30, 144, 255, 0.6);
    color: #ffffff;
}

/* Bottom UI Bar */
#bottom-ui {
    position: fixed;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 100;
    pointer-events: none;
    /* Allow clicks through to canvas if needed, but buttons will have pointer-events auto */
}

.icon-toggle-btn {
    position: relative;
    /* For tooltip positioning */
    pointer-events: auto;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    /* background: var(--panel-bg); */
    background: none;
    /* border: 1px solid rgba(255, 255, 255, 0.2); */
    border: none;
    color: #888;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* backdrop-filter: blur(10px); */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    padding: 0;
}

.icon-toggle-btn svg {
    display: block;
}

.icon-toggle-btn:hover {
    border-color: var(--icon-color);
    box-shadow: 0 0 15px var(--icon-color);
}

.icon-toggle-btn.active {
    color: var(--icon-color);
    border-color: var(--icon-color);
}



.icon-toggle-btn:active {
    background: rgba(255, 255, 255, 0.1);
}

body.light-mode .icon-toggle-btn {
    border-color: rgba(0, 0, 0, 0.1);
}

#btn-toggle-azimuthal-grid,
#btn-toggle-transparent-ground {
    display: none;
}

.has-tooltip {
    position: relative;
}

/* Tooltip Styles */
.has-tooltip[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(110% + 0px);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--panel-bg);
    color: var(--text-color);
    padding: 6px 14px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    z-index: 1000;
}

/* Small arrow for tooltip */
.has-tooltip[data-tooltip]::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    border: 5px solid transparent;
    border-top-color: var(--panel-bg);
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.has-tooltip[data-tooltip]:hover::after,
.has-tooltip[data-tooltip]:hover::before {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

body.light-mode .has-tooltip[data-tooltip]::after {
    border-color: rgba(0, 0, 0, 0.1);
}

body.light-mode .has-tooltip[data-tooltip]::before {
    border-top-color: var(--panel-bg);
}

/* --- Help Button --- */
.help-btn {
    position: absolute;
    bottom: 25px;
    left: 25px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 20px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 200;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.3s, border-color 0.3s;
    backdrop-filter: blur(8px);
}

.help-btn:hover {
    transform: scale(1.1) rotate(10deg);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

body.light-mode .help-btn {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* --- Calendar Button --- */
.calendar-btn {
    position: absolute;
    bottom: 25px;
    left: 80px;
    /* Positioned right of the help button */
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 200;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), background-color 0.3s, border-color 0.3s;
    backdrop-filter: blur(8px);
}

.calendar-btn:hover {
    transform: scale(1.1);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

body.light-mode .calendar-btn {
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* --- Help Modal Overlay --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    /* Dimmed background */
    backdrop-filter: blur(1px);
    /* Glassmorphism blur */
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    animation: fadeIn 0.3s forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* --- Help Modal Content Box --- */
.modal-content {
    background: var(--panel-bg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    width: 90%;
    max-width: 450px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    transform: translateY(20px);
    animation: slideUp 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    padding: 0;
}

/* --- Modificador para el modal del calendario (más grande) --- */
.calendar-modal-content {
    max-width: 65%;
    height: 90vh;
    display: flex;
    flex-direction: column;
}

body.light-mode .modal-content {
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

@keyframes slideUp {
    from {
        transform: translateY(20px) scale(0.95);
    }

    to {
        transform: translateY(0) scale(1);
    }
}

/* --- Modal Header --- */
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
}

body.light-mode .modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    background: rgba(0, 0, 0, 0.02);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-color);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 28px;
    cursor: pointer;
    line-height: 1;
    opacity: 0.6;
    transition: opacity 0.2s, transform 0.2s;
    padding: 0;
    margin-top: -5px;
}

.close-btn:hover {
    opacity: 1;
    transform: scale(1.1);
    color: #ff4a4a;
}

/* --- Modal Body & List --- */
.modal-body {
    padding: 20px;
}

.shortcuts-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.shortcuts-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    transition: background 0.2s;
}

body.light-mode .shortcuts-list li {
    background: rgba(0, 0, 0, 0.02);
}

.shortcuts-list li:hover {
    background: rgba(255, 255, 255, 0.08);
}

body.light-mode .shortcuts-list li:hover {
    background: rgba(0, 0, 0, 0.05);
}

.keys {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9em;
    font-weight: 500;
    opacity: 0.9;
}

/* Elegant tactile keyboard keys */
kbd {
    background-color: #2a2a2a;
    border: 1px solid #444;
    border-bottom-width: 2px;
    border-radius: 4px;
    box-shadow: inset 0 -1px 0 #111;
    color: #eee;
    display: inline-block;
    font-family: inherit;
    font-size: 0.85em;
    font-weight: 600;
    padding: 2px 6px;
    white-space: nowrap;
}

body.light-mode kbd {
    background-color: #f8f9fa;
    border: 1px solid #ccc;
    border-bottom-color: #aaa;
    box-shadow: inset 0 -1px 0 #ddd;
    color: #333;
}

.desc {
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.8;
    text-align: right;
    width: 60%;
    line-height: 1.3;
}