/* ------------------------------------------------------------------
   CUSTOM THEMING & ANIMATIONS
------------------------------------------------------------------ */
:root {
    --bg-animation: linear-gradient(-45deg, #1e3c72, #2a5298, #0f2027, #203a43);
    --card-bg: rgba(255, 255, 255, 0.95);
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --secondary-text: #6c757d;
    --border-color: #e9ecef;
    --accent-color: #007bff;
    --error-color: #dc3545;
    --header-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --collapsible-bg: #ffffff;
    --collapsible-header-bg: #f1f3f5;
    --collapsible-icon: #6c757d;
    --highlight-color: #ff6b6b;
    --arrow-color: #00aaff;
    --axis-color: #495057;
    --grid-color: #dee2e6;
    --axis-label-size: 16px;
    --transition-speed: 0.4s;
    --font-family: 'Roboto Slab', serif;
}

body.dark {
    --card-bg: rgba(33, 37, 41, 0.95);
    --bg-color: #212529;
    --text-color: #f8f9fa;
    --secondary-text: #adb5bd;
    --border-color: #495057;
    --accent-color: #66b0ff;
    --error-color: #ff8787;
    --header-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --collapsible-bg: #343a40;
    --collapsible-header-bg: #495057;
    --collapsible-icon: #ced4da;
    --highlight-color: #ff8787;
    --arrow-color: #66b0ff;
    --axis-color: #ced4da;
    --grid-color: #6c757d;
}

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-family), 'Helvetica Neue', Arial, sans-serif;
}

body {
    background: var(--bg-animation);
    background-size: 600% 600%;
    animation: gradientBG 20s ease infinite;
    color: var(--text-color);
    line-height: 1.6;
    transition: background var(--transition-speed), color var(--transition-speed);
    overflow: hidden;
    height: 100vh;
    position: relative;
    font-weight: 400;
    letter-spacing: 0.2px;
}

@keyframes gradientBG {
    0% { background-position: 0% 0%; }
    25% { background-position: 100% 0%; }
    50% { background-position: 100% 100%; }
    75% { background-position: 0% 100%; }
    100% { background-position: 0% 0%; }
}

h1, h2, h3 {
    margin: 0;
    font-weight: 800;
    letter-spacing: 0.8px;
}

h1 {
    font-size: 1.75rem;
    background: linear-gradient(90deg, var(--accent-color), color-mix(in srgb, var(--accent-color), #fff 50%));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

a, button {
    cursor: pointer;
}

/* Header */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(255, 255, 255, 0.85) 100%);
    box-shadow: var(--header-shadow), inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    padding: 15px 30px;
    transition: background var(--transition-speed);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 60px;
    animation: slideDown 0.8s ease-out;
}

body.dark header {
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(33, 37, 41, 0.85) 100%);
}

@keyframes slideDown {
    from { transform: translateY(-20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Layout */
.container {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    padding-top: 60px;
}

.sidebar {
    width: min(25vw, 400px);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    overflow-y: auto;
    transition: transform var(--transition-speed) ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    position: absolute;
    top: 60px;
    left: 0;
    height: calc(100vh - 60px);
    z-index: 90;
    transform: translateX(0);
}

body.dark .sidebar {
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.canvas-container {
    position: absolute;
    top: 60px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 60px);
    background: var(--bg-color);
    transition: background var(--transition-speed);
}

.canvas-container.fullscreen {
    width: 100vw;
    left: 0;
}

#canvas-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

canvas {
    display: block;
    width: 100vw !important;
    height: calc(100vh - 60px) !important;
    transition: transform 0.2s ease;
}

/* Forms & Controls */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--secondary-text);
    transition: color var(--transition-speed);
    font-size: 1rem;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
    background: color-mix(in srgb, var(--collapsible-bg), #fff 5%);
    color: var(--text-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

input:focus,
select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.5), inset 0 2px 4px rgba(0, 0, 0, 0.06);
    background: var(--collapsible-bg);
}

select {
    cursor: pointer;
}

/* Collapsible Panels */
.collapsible {
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    overflow: hidden;
    background: var(--collapsible-bg);
    backdrop-filter: blur(10px);
    transition: background var(--transition-speed), color var(--transition-speed);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

body.dark .collapsible {
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.collapsible-header {
    padding: 14px 20px;
    background: linear-gradient(to right, var(--collapsible-header-bg), color-mix(in srgb, var(--collapsible-header-bg), #fff 10%));
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.3s ease, transform 0.2s ease;
}

.collapsible-header:hover {
    background: linear-gradient(to right, var(--collapsible-header-bg), color-mix(in srgb, var(--collapsible-header-bg), #fff 20%));
    transform: translateY(-2px);
}

.collapsible-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-color);
}

.collapsible-icon {
    transition: transform 0.3s;
    font-size: 1.2rem;
    color: var(--collapsible-icon);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.3s;
    padding: 0 20px;
}

.collapsible.open .collapsible-content {
    padding: 20px;
    max-height: 900px;
}

.collapsible.open .collapsible-icon {
    transform: rotate(180deg);
}

/* Range Sliders */
.range-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.range-group input[type="range"] {
    flex: 1;
    cursor: pointer;
    accent-color: var(--accent-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 20px;
    background: linear-gradient(45deg, var(--accent-color), color-mix(in srgb, var(--accent-color), #fff 20%));
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
    font-weight: 600;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.5);
    background: linear-gradient(45deg, var(--accent-color), color-mix(in srgb, var(--accent-color), #fff 30%));
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(0, 123, 255, 0.2);
}

.btn-icon {
    padding: 10px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.btn-secondary {
    background: var(--secondary-text);
}

.btn-secondary:hover {
    background: color-mix(in srgb, var(--secondary-text), #000 10%);
}

/* Zoom & Coordinate Readout */
.zoom-controls {
    position: absolute;
    bottom: 25px;
    right: 25px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 10;
    background: var(--card-bg);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.zoom-controls:hover {
    transform: scale(1.05);
}

.coord-readout {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--card-bg);
    border: none;
    border-radius: 6px;
    padding: 8px 15px;
    font-size: 0.9rem;
    color: var(--secondary-text);
    pointer-events: none;
    transition: background var(--transition-speed);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    font-family: 'Courier New', monospace;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Error Messages */
.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 6px;
    min-height: 1.2em;
}

/* Extra UI */
.extra-buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

/* Custom Scrollbar */
.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-color), color-mix(in srgb, var(--accent-color), #000 20%));
    border-radius: 10px;
    border: 2px solid var(--card-bg);
}

.sidebar::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 10px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--accent-color), color-mix(in srgb, var(--accent-color), #000 30%));
}

/* Links in More Information */
.collapsible-content a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s;
}

.collapsible-content a:hover {
    color: color-mix(in srgb, var(--accent-color), #fff 20%);
    text-decoration: underline;
}

/* Improved Typography in More Information */
.collapsible-content p,
.collapsible-content ul {
    font-size: 0.95rem;
    color: var(--text-color);
}

.collapsible-content ul {
    margin-left: 20px;
    list-style-type: disc;
}

/* Help Overlay for 3D Navigation Instructions */
.help-overlay {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(5px);
    color: #e0e0e0;
    padding: 10px 15px;
    border-radius: 6px;
    border-left: 4px solid var(--accent-color);
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0.8;
    font-family: 'Courier New', monospace;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 0.8; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: 50vh;
        top: auto;
        bottom: 0;
        transform: translateY(100%);
        padding: 1rem;
        box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.2);
        transition: transform 0.4s ease-in-out;
    }

    .sidebar.open {
        transform: translateY(0);
    }

    .sidebar.collapsed {
        transform: translateY(100%);
    }

    .canvas-container {
        width: 100vw;
        height: calc(100vh - 60px);
    }

    .canvas-container.fullscreen {
        width: 100vw;
        height: calc(100vh - 60px);
    }

    header {
        padding: 0.8rem 1rem;
        height: 50px;
    }

    h1 {
        font-size: 1.4rem;
        margin-left: 5px;
    }

    .btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }

    .coord-readout {
        top: 4rem;
    }

    canvas {
        height: calc(100vh - 50px) !important;
    }

    .container {
        padding-top: 50px;
    }
}