@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-color: #07080d;
    --panel-bg: rgba(13, 17, 33, 0.6);
    --panel-border: rgba(255, 255, 255, 0.08);
    --panel-highlight: rgba(255, 255, 255, 0.03);
    --text-main: #f1f5f9;
    --text-muted: #8e9bb4;
    
    /* Angle specific colors (Standard Aerospace: Roll=X=Red, Pitch=Y=Green, Yaw=Z=Blue) */
    --color-roll: #ff3b30;    /* X-axis: Red */
    --color-pitch: #00ff88;   /* Y-axis: Emerald Green */
    --color-yaw: #3b82f6;     /* Z-axis: Blue */
    
    --color-roll-glow: rgba(255, 59, 48, 0.15);
    --color-pitch-glow: rgba(0, 255, 136, 0.15);
    --color-yaw-glow: rgba(59, 130, 246, 0.15);
    
    --accent-blue: #535bf2;
    --accent-glow: rgba(83, 91, 242, 0.3);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 0, 127, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 240, 255, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(83, 91, 242, 0.02) 0%, transparent 60%);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--panel-border);
    background: rgba(7, 8, 13, 0.8);
    backdrop-filter: blur(12px);
    z-index: 10;
    position: sticky;
    top: 0;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 2.2rem;
    height: 2.2rem;
    fill: none;
    stroke: url(#logo-grad);
    stroke-width: 2;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

header h1 {
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 30%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

/* Common button styles */
.btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: var(--accent-blue);
    border-color: transparent;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
    background: #646cff;
    box-shadow: 0 4px 16px rgba(83, 91, 242, 0.5);
}

.btn-icon {
    padding: 0.5rem;
    border-radius: 8px;
}

/* Layout container */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 450px;
    height: calc(100vh - 65px);
    overflow: hidden;
}

@media (max-width: 1100px) {
    .main-layout {
        grid-template-columns: 1fr;
        height: auto;
        overflow: visible;
    }
}

/* Left side: 3D Viewport */
.viewport-area {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #030407;
    overflow: hidden;
}

@media (max-width: 1100px) {
    .viewport-area {
        height: 60vh;
        min-height: 400px;
    }
}

#canvas3d {
    width: 100%;
    height: 100%;
    display: block;
}

/* Floating overlay inside 3D Viewport */
.viewport-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    pointer-events: none;
    z-index: 5;
}

.viewport-overlay > * {
    pointer-events: auto;
}

.pill-selector {
    background: rgba(13, 17, 33, 0.85);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(12px);
    border-radius: 30px;
    padding: 0.25rem;
    display: flex;
    gap: 0.25rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.pill-option {
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.pill-option.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.hud-instructions {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(13, 17, 33, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.hud-instructions span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hud-instructions span strong {
    color: var(--text-main);
}

/* Coordinate axes legend */
.axes-legend {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    background: rgba(13, 17, 33, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    pointer-events: none;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-color {
    width: 12px;
    height: 3px;
    border-radius: 2px;
}

.legend-color.x { background: var(--color-roll); }
.legend-color.y { background: var(--color-pitch); }
.legend-color.z { background: var(--color-yaw); }

/* Right side: Control Panel */
.sidebar-panel {
    background: rgba(10, 11, 16, 0.95);
    border-left: 1px solid var(--panel-border);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow-y: auto;
    backdrop-filter: blur(20px);
}

.panel-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--panel-border);
}

.panel-section:last-child {
    border-bottom: none;
}

.panel-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #fff;
    letter-spacing: -0.01em;
}

.panel-title svg {
    width: 1.1rem;
    height: 1.1rem;
    fill: currentColor;
    opacity: 0.9;
}

/* Form controls */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.angle-label-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.angle-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.angle-dot.yaw { background: var(--color-yaw); box-shadow: 0 0 6px var(--color-yaw); }
.angle-dot.pitch { background: var(--color-pitch); box-shadow: 0 0 6px var(--color-pitch); }
.angle-dot.roll { background: var(--color-roll); box-shadow: 0 0 6px var(--color-roll); }

.angle-val-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    min-width: 65px;
    text-align: right;
}

.angle-val-display.yaw-txt { color: var(--color-yaw); }
.angle-val-display.pitch-txt { color: var(--color-pitch); }
.angle-val-display.roll-txt { color: var(--color-roll); }

/* Slider inputs */
.slider-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.slider-container input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: rgba(255,255,255,0.1);
    outline: none;
    transition: background 0.3s;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.2s ease;
}

.slider-container input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.2s ease;
}

.slider-container input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.25);
}

/* Slider-specific Colors */
#slider-yaw::-webkit-slider-thumb { background: var(--color-yaw); box-shadow: 0 0 8px var(--color-yaw); }
#slider-yaw::-moz-range-thumb { background: var(--color-yaw); box-shadow: 0 0 8px var(--color-yaw); }
#slider-yaw { background: linear-gradient(to right, var(--color-yaw-glow), var(--color-yaw-glow)) no-repeat; }

#slider-pitch::-webkit-slider-thumb { background: var(--color-pitch); box-shadow: 0 0 8px var(--color-pitch); }
#slider-pitch::-moz-range-thumb { background: var(--color-pitch); box-shadow: 0 0 8px var(--color-pitch); }
#slider-pitch { background: linear-gradient(to right, var(--color-pitch-glow), var(--color-pitch-glow)) no-repeat; }

#slider-roll::-webkit-slider-thumb { background: var(--color-roll); box-shadow: 0 0 8px var(--color-roll); }
#slider-roll::-moz-range-thumb { background: var(--color-roll); box-shadow: 0 0 8px var(--color-roll); }
#slider-roll { background: linear-gradient(to right, var(--color-roll-glow), var(--color-roll-glow)) no-repeat; }

/* Custom select dropdown */
select.input-select {
    width: 100%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--panel-border);
    color: var(--text-main);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.875rem;
    outline: none;
    cursor: pointer;
    transition: all 0.2s;
}

select.input-select:focus {
    border-color: var(--accent-blue);
    background: rgba(255, 255, 255, 0.08);
}

select.input-select option {
    background-color: #0a0b10;
    color: var(--text-main);
}

/* Card layout for math outputs */
.math-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255,255,255,0.04);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: border-color 0.3s;
}

.math-card:hover {
    border-color: rgba(255, 255, 255, 0.08);
}

.math-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.75rem;
}

.math-value-mono {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

/* Rotation Matrix Grid */
.matrix-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.5rem;
}

.matrix-brackets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    position: relative;
    border-left: 2px solid var(--text-muted);
    border-right: 2px solid var(--text-muted);
    border-radius: 6px;
    width: 100%;
}

.matrix-cell {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    text-align: center;
    color: var(--text-main);
    padding: 0.25rem 0;
    min-width: 55px;
}

/* Gimbal Lock Panel */
.gimbal-lock-banner {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.banner-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #ef4444;
    font-size: 0.9rem;
    font-weight: 600;
}

.banner-header svg {
    width: 1.1rem;
    height: 1.1rem;
    fill: currentColor;
}

.banner-body {
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--text-muted);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    justify-content: center;
    margin-top: 0.25rem;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: rgba(239, 68, 68, 0.5);
    color: #ffffff;
}

.btn-danger.active {
    background: #ef4444;
    color: #fff;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.4);
}

/* Checkbox control */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.checkbox-container input {
    display: none;
}

.checkbox-custom {
    width: 16px;
    height: 16px;
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.03);
    position: relative;
    transition: all 0.2s;
}

.checkbox-container input:checked + .checkbox-custom {
    background: var(--accent-blue);
    border-color: transparent;
}

.checkbox-container input:checked + .checkbox-custom::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container:hover .checkbox-custom {
    border-color: rgba(255, 255, 255, 0.2);
}

/* Bottom Educational fold */
.edu-drawer {
    grid-column: 1 / -1;
    background: #0a0b10;
    border-top: 1px solid var(--panel-border);
    padding: 2.5rem;
}

.edu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.edu-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 0.5rem;
}

.edu-card p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.edu-card ul {
    margin-left: 1.25rem;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.edu-card strong {
    color: var(--text-main);
}

.edu-card code {
    font-family: 'JetBrains Mono', monospace;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--color-roll);
}

/* Scrollbar customization */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}