/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
    /* Colors - Maritime Theme */
    --color-primary: #054861;
    --color-primary-light: #075985;
    --color-primary-lighter: #0369a1;
    --color-accent: #0ea5e9;
    --color-accent-light: #bae6fd;
    --color-accent-lighter: #cffafe;
    
    --color-bg-primary: #e8f4f8;
    --color-bg-secondary: #ffffff;
    --color-bg-overlay: rgba(255, 255, 255, 0.95);
    
    --color-text-primary: #1e293b;
    --color-text-secondary: #054861;
    --color-text-muted: #666;
    
    --color-border: rgba(0, 0, 0, 0.05);
    --color-border-light: #ddd;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 10px;
    --spacing-lg: 12px;
    --spacing-xl: 15px;
    --spacing-2xl: 16px;
    --spacing-3xl: 20px;
    
    /* Layout */
    --container-max-width: 900px;
    --container-min-width: 900px;
    --header-height: 60px;
    --canvas-top-offset: 70px;
    --dashboard-top-offset: 460px;
    
    /* Border Radius */
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --radius-2xl: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 6px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-xl: 0 4px 10px rgba(0,0,0,0.2);
    --shadow-panel: -2px 0 8px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.1s;
    --transition-base: 0.2s;
    --transition-slow: 0.3s ease-in-out;
    
    /* Z-Index Layers */
    --z-base: 1;
    --z-overlay: 10;
    --z-header: 100;
    --z-panel: 200;
    --z-tooltip: 100;
}


/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg-primary);
    margin: 0;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    overflow: auto;
    position: relative;
}


/* ============================================
   TYPOGRAPHY
   ============================================ */

label {
    font-size: 10px;
    font-weight: bold;
    color: var(--color-text-secondary);
    text-transform: uppercase;
}

kbd {
    background-color: #eee;
    border-radius: var(--radius-sm);
    border: 1px solid #b4b4b4;
    padding: 2px var(--spacing-xs);
    font-size: 9px;
    font-weight: 700;
}


/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

/* Main Container */
#main-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    width: 100%;
    max-width: var(--container-max-width);
    min-width: var(--container-min-width);
    background-color: var(--color-bg-primary);
    padding: var(--spacing-md);
    border-radius: 0;
}

/* Dashboard Layout */
#dashboard-row {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: var(--spacing-md);
    width: 100%;
    align-items: stretch;
    margin-top: var(--dashboard-top-offset);
}

#graphs-column {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    flex: 1;
    align-self: stretch;
    min-height: 0;
}


/* ============================================
   HEADER COMPONENT
   ============================================ */

#main-header {
    width: 100%;
    max-width: var(--container-max-width);
    min-width: var(--container-min-width);
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-lg) var(--spacing-3xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-header);
    margin: 0;
}

#header-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--color-text-secondary);
}


/* ============================================
   BUTTONS & INTERACTIVE ELEMENTS
   ============================================ */

#doc-toggle {
    background: none;
    border: none;
    color: var(--color-primary-lighter);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    padding: 6px var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-base), color var(--transition-base);
}

#doc-toggle:hover {
    background-color: var(--color-accent-light);
    color: var(--color-primary-light);
}

#doc-close {
    position: absolute;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    background: none;
    border: none;
    font-size: 28px;
    font-weight: bold;
    color: var(--color-text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-base), color var(--transition-base);
}

#doc-close:hover {
    background-color: var(--color-accent-light);
    color: var(--color-primary-light);
}

input[type=checkbox] {
    cursor: pointer;
}


/* ============================================
   DOCUMENTATION PANEL
   ============================================ */

#doc-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 400px;
    max-width: 90vw;
    height: 100vh;
    background-color: var(--color-bg-secondary);
    box-shadow: var(--shadow-panel);
    z-index: var(--z-panel);
    overflow-y: auto;
    transform: translateX(0);
    transition: transform var(--transition-slow);
    padding: var(--spacing-3xl);
}

#doc-panel.doc-panel-hidden {
    transform: translateX(100%);
}

.readme-content {
    padding: var(--spacing-3xl);
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-primary);
}

.readme-content h1 {
    font-size: 18px;
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.readme-content h2 {
    font-size: 16px;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-light);
}

.readme-content p {
    margin-bottom: var(--spacing-md);
}

.readme-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-3xl);
}

.readme-content li {
    margin-bottom: var(--spacing-xs);
}

.readme-content a {
    color: var(--color-primary-lighter);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.readme-content a:hover {
    color: var(--color-primary-light);
    text-decoration-thickness: 2px;
}


/* ============================================
   CANVAS & GRAPH COMPONENTS
   ============================================ */

.canvas-wrapper {
    position: relative;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

#main-container > .canvas-wrapper:first-child {
    position: fixed;
    top: var(--canvas-top-offset);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-overlay);
    width: calc(100% - 20px);
    max-width: var(--container-max-width);
    margin-top: var(--spacing-md);
}

canvas {
    display: block;
    cursor: crosshair;
    width: 100%;
    height: auto;
}

/* Graph Canvas Wrappers - Flexible Height */
#graphs-column .canvas-wrapper:not(#avgThrustStatus):not(#avgLiftStatus):not(#avgGForceStatus) {
    display: flex;
    flex-direction: column;
    flex: 1 1 0;
    min-height: 0;
}

#graphs-column .canvas-wrapper:not(#avgThrustStatus):not(#avgLiftStatus):not(#avgGForceStatus) canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    flex: 1;
}

/* Connected Graph & Status Pairs */
#graphs-column > .canvas-wrapper:nth-child(1),
#graphs-column > .canvas-wrapper:nth-child(3),
#graphs-column > .canvas-wrapper:nth-child(5) {
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    margin-bottom: 0;
    border-bottom: none;
}

#graphs-column > .canvas-wrapper:nth-child(2),
#graphs-column > .canvas-wrapper:nth-child(4),
#graphs-column > .canvas-wrapper:nth-child(6) {
    border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
    margin-top: calc(-1 * var(--spacing-2xl));
    border-top: none;
}


/* ============================================
   UI OVERLAYS & CONTROLS
   ============================================ */

#ui-overlay {
    position: absolute;
    top: var(--spacing-3xl);
    right: var(--spacing-3xl);
    left: auto;
    background-color: var(--color-bg-overlay);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    pointer-events: auto;
    font-family: monospace;
    font-size: 13px;
    line-height: 1.6;
    box-shadow: var(--shadow-lg);
    min-width: 260px;
    z-index: var(--z-overlay);
}

#slowmo-controls {
    position: absolute;
    bottom: var(--spacing-xl);
    left: var(--spacing-3xl);
    background-color: var(--color-bg-overlay);
    padding: 6px var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    font-size: 11px;
    font-weight: bold;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-overlay);
}

#visibility-controls {
    position: absolute;
    bottom: var(--spacing-xl);
    right: var(--spacing-3xl);
    background-color: var(--color-bg-overlay);
    padding: 6px var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    display: grid;
    grid-template-columns: repeat(4, auto);
    gap: var(--spacing-xs) var(--spacing-lg);
    font-size: 10px;
    font-weight: bold;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-overlay);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    user-select: none;
}

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


/* ============================================
   FORM CONTROLS
   ============================================ */

#controls {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 300px;
    align-self: stretch;
    overflow-y: auto;
    max-height: 100%;
    overflow: visible;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 110px;
}

/* Range Inputs */
input[type=range] {
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    width: 100%;
    background: #b8e0f0;
    margin: 6px 0;
    border-radius: var(--radius-sm);
}

input[type=range]:focus {
    outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: transparent;
    border-radius: var(--radius-sm);
}

input[type=range]::-webkit-slider-thumb {
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--color-primary-lighter);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -5px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
    transition: transform var(--transition-fast);
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* Slider Wrapper & Limit Handles */
.slider-wrapper {
    position: relative;
    width: 100%;
    height: 12px;
    display: flex;
    align-items: center;
}

.slider-wrapper input[type=range] {
    margin: 0;
    z-index: var(--z-base);
}

.limit-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 20px;
    cursor: ew-resize;
    z-index: var(--z-overlay);
    transform: translateX(-50%);
    touch-action: none;
}

.limit-handle::after {
    content: '';
    position: absolute;
    left: 8px;
    top: 2px;
    bottom: 2px;
    width: 4px;
    background-color: #ef4444;
    border-radius: 2px;
    pointer-events: none;
}

.limit-handle:hover::after {
    background-color: #dc2626;
    box-shadow: 0 0 4px rgba(0,0,0,0.2);
}


/* ============================================
   TOOLTIPS
   ============================================ */

.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
    border-bottom: 1px dotted var(--color-primary-lighter);
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: 220px;
    background-color: var(--color-text-secondary);
    color: #ffffff;
    text-align: left;
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    position: absolute;
    z-index: var(--z-tooltip);
    top: 50%;
    right: 105%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 11px;
    line-height: 1.4;
    font-weight: normal;
    box-shadow: var(--shadow-xl);
    pointer-events: none;
}

.tooltip .tooltip-text::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 100%;
    margin-top: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: transparent transparent transparent var(--color-text-secondary);
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}


/* ============================================
   UTILITIES & COMPONENT CLASSES
   ============================================ */

#presets-section {
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    background-color: #fff7ed;
    padding: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

#main-container {
    padding: var(--spacing-md);
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border-light);
    margin: var(--spacing-xs) 0;
}

.flex-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.flex-row-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex-col {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.flex-gap-sm {
    display: flex;
    gap: var(--spacing-sm);
}

.flex-gap-xs {
    display: flex;
    gap: 5px;
}

.cursor-pointer {
    cursor: pointer;
}

.user-select-none {
    user-select: none;
}

.text-center {
    text-align: center;
}

.control-section {
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.control-section-step1 {
    background-color: #fdf4ff;
    border: 1px solid #f0abfc;
}

.control-section-speed {
    background-color: #f0f9ff;
    border: 1px solid #bae6fd;
}

.control-section-step2 {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
}

.control-section-simulation {
    background-color: #f4f4f5;
    border: 1px solid #e4e4e7;
}

.step-label {
    font-size: 11px;
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.step-label-step1 {
    color: #7c3aed;
}

.step-label-step2 {
    color: #475569;
}

.status-box {
    padding: var(--spacing-sm);
    text-align: center;
    font-size: 12px;
    font-weight: bold;
}

.status-box-lift,
.status-box-thrust {
    background-color: #e8f5e9;
}

.status-box-gforce {
    background-color: #f3e5f5;
}

.preset-buttons-row {
    display: flex;
    gap: 5px;
    margin-top: var(--spacing-xs);
}

.preset-select-row {
    display: flex;
    gap: 5px;
}

#preset-select {
    flex: 1;
    font-size: 11px;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    border: 1px solid #ccc;
}

.preset-button {
    flex: 1;
    cursor: pointer;
    font-size: 10px;
    padding: var(--spacing-xs);
    background: #fff;
    border: 1px solid #ccc;
    border-radius: var(--radius-md);
    font-weight: bold;
}

#btn-save-preset {
    color: #d97706;
}

#btn-delete-preset {
    color: #dc2626;
}

#btn-download-preset {
    color: #2563eb;
}

#btn-upload-preset {
    color: #059669;
}

#btn-reset-presets {
    color: #4b5563;
}

#file-upload-preset {
    display: none;
}

.control-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.range-toggle {
    cursor: pointer;
    font-size: 9px;
    color: var(--color-primary-lighter);
    font-weight: bold;
    user-select: none;
}

.lock-label {
    font-size: 9px;
    cursor: pointer;
    color: var(--color-text-muted);
    font-weight: bold;
}

.lock-label input[type=checkbox] {
    margin: 0 3px 0 0;
    vertical-align: middle;
}

.range-inputs {
    display: none;
    justify-content: space-between;
    gap: 5px;
    margin-bottom: var(--spacing-xs);
    background: #f1f5f9;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.range-inputs.visible {
    display: flex;
}

.range-label {
    font-size: 9px;
    color: var(--color-text-muted);
    align-self: center;
}

.range-number-input {
    width: 50px;
    font-size: 10px;
    padding: 1px;
}

.optimize-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 5px;
    margin-bottom: 2px;
}

.optimize-label {
    font-size: 10px;
    font-weight: bold;
    color: var(--color-text-muted);
}

#opt-metric {
    font-size: 10px;
    padding: 2px;
    border: 1px solid #ccc;
    border-radius: var(--radius-md);
    background: white;
}

.tooltip-full-width {
    width: 100%;
    border-bottom: none;
}

#btn-optimize {
    width: 100%;
    padding: var(--spacing-sm);
    margin-top: 5px;
    cursor: pointer;
    font-size: 11px;
    font-weight: bold;
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-radius: var(--radius-lg);
    color: #166534;
    transition: background var(--transition-base);
}

#btn-optimize:hover {
    background: #dcfce7;
}

.tooltip-text-center {
    width: 200px;
    text-align: center;
}

.reset-limits-wrapper {
    text-align: center;
    margin-top: var(--spacing-xs);
}

#btn-reset-limits {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 9px;
    color: #94a3b8;
    font-weight: bold;
}

.action-buttons-row {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: 5px;
}

.action-button {
    flex: 1;
    padding: var(--spacing-sm);
    cursor: pointer;
    font-size: 11px;
    font-weight: bold;
    border-radius: var(--radius-lg);
    transition: background var(--transition-base);
}

#btn-reset,
#btn-replay {
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    color: #475569;
}

#btn-reset:hover,
#btn-replay:hover {
    background: #e2e8f0;
}

#btn-tests {
    background: #e0f2fe;
    border: 1px solid #7dd3fc;
    color: #0369a1;
}

#btn-tests:hover {
    background: #bae6fd;
}

.slowmo-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.slowmo-commands {
    font-size: 9px;
    color: var(--color-text-muted);
    font-weight: normal;
    display: flex;
    gap: var(--spacing-md);
}

.cmd-button {
    cursor: pointer;
    user-select: none;
}

.label-inline {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.label-muted {
    font-weight: normal;
    color: var(--color-text-muted);
}

.dot-lift { background: blue; }
.dot-drag { background: red; }
.dot-rider { background: orange; }
.dot-thrust { background: cyan; border: 1px solid #999; }
.dot-weight { background: rgb(255, 251, 0); }
.dot-assembly { background: #666; }
.dot-stab { background: #d946ef; }
.dot-net { background: lime; border: 1px solid #333; }


/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    #ui-overlay {
        font-size: 11px;
        padding: var(--spacing-md);
        min-width: 140px;
        right: var(--spacing-md);
        top: var(--spacing-md);
    }
    
    #visibility-controls {
        grid-template-columns: repeat(3, auto);
        right: var(--spacing-md);
    }
}