/* style.css - Physics & Chemistry Mind Map */

:root {
    /* Default Colors */
    --color-primary: #667eea;
    --color-primary-dark: #5a67d8;
    --color-bg-primary: #eef2f7;
    --color-bg-sidebar: #f6f8fa;
    --color-bg-secondary: #ffffff;
    --color-bg-hover: #f3f4f6;
    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-text-muted: #6e7781;
    --color-border: #d0d7de;
    --color-border-hover: #6e7781;
    
    /* Node Colors */
    --node-subject: #FFD700;
    --node-chapter: #FFB6C1;
    --node-topic: #98FB98;
    --node-concept: #FFA07A;
    --node-description: #DDA0DD;
    
    /* Spacing */
    --sidebar-width: 320px;
    --sidebar-collapsed: 50px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-family-hindi: 'Noto Sans Devanagari', 'Inter', sans-serif;
    --font-size-lg: 14px;
    --font-size-xl: 16px;
}

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

body {
    font-family: var(--font-family);
    display: flex;
    height: 100vh;
    overflow: hidden;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
}

body.hindi-active {
    font-family: var(--font-family-hindi);
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-bg-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    transition: width 0.3s ease;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

/* ===== COLLAPSE FIX - SAB KUCH CHHUPA DO ===== */
.sidebar.collapsed .sidebar-content {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    pointer-events: none;
}

.sidebar.collapsed .sidebar-header {
    padding: var(--spacing-lg) 0;
    justify-content: center;
}

.sidebar.collapsed .sidebar-title {
    display: none;
}

.sidebar.collapsed .sidebar-toggle {
    margin: 0 auto;
}

/* Sidebar Header */
.sidebar-header {
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 60px;
}

.sidebar-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-toggle {
    width: 30px;
    height: 30px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.2s;
}

.sidebar-toggle:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-hover);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* ===== SECTIONS ===== */
.section {
    margin-bottom: var(--spacing-xxl);
}

.section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
}

hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

/* ===== RADIO GROUP ===== */
.radio-group {
    margin-bottom: 12px;
}

.radio-label {
    display: block;
    margin-bottom: 8px;
    cursor: pointer;
}

.radio-label input {
    margin-right: 8px;
}

/* ===== INSTRUCTIONS ===== */
.instructions {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    padding: 12px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

/* ===== CONTENT INFO ===== */
.content-info {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    padding: 12px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.content-info strong {
    color: var(--color-text-primary);
}

/* ===== LEGEND ===== */
.legend {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

/* ===== NAVIGATION STYLES ===== */
.navigation-container {
    width: 100%;
}

.nav-links-wrapper {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.nav-section {
    background: var(--color-bg-secondary);
    border-radius: 8px;
    padding: 12px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.nav-section-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--color-border);
    text-transform: uppercase;
}

.nav-link {
    display: block;
    padding: 8px 12px;
    margin: 4px 0;
    border-radius: 6px;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 13px;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--color-bg-hover);
    border-left-color: var(--color-primary);
    transform: translateX(4px);
}

.nav-link.active {
    background: #e8eef7;
    border-left-color: var(--color-primary);
    font-weight: 600;
}

.nav-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-secondary);
}

.header-controls {
    position: absolute;
    top: 15px;
    left: 25px;
    right: 25px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
}

.tabs {
    display: flex;
    gap: 8px;
    pointer-events: auto;
}

.tab-btn {
    padding: 8px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 14px;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-hover);
}

.tab-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.tab-btn.active:hover {
    background: var(--color-primary-dark);
}

.badge {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid var(--color-border);
    pointer-events: auto;
}

/* ===== CONTAINER & SVG ===== */
#container {
    flex: 1;
    overflow: auto;
    position: relative;
    background: var(--color-bg-secondary);
    padding: 20px;
}

svg {
    display: block;
    margin: 0 auto;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

/* Node styling */
.node rect {
    cursor: pointer;
    transition: filter 0.2s;
}

.node:hover rect {
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1));
}

.node text {
    user-select: none;
    pointer-events: none;
    fill: #000;
    font-family: inherit;
}

/* Connection paths */
.connection path {
    stroke: #8f97b3;
    stroke-width: 2;
    fill: none;
    opacity: 0.8;
    transition: stroke 0.2s;
}

.connection:hover path {
    stroke: var(--color-primary);
}

/* ===== FOOTER ===== */
.footer {
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: center;
    padding-top: 16px;
    margin-top: 16px;
    border-top: 1px solid var(--color-border);
}

/* ===== LOADING STATES ===== */
html.js-loading {
    visibility: hidden;
    opacity: 0;
}

html.js-loaded {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.2s ease;
}

/* Transitions disabled by default */
.sidebar {
    transition: none !important;
}

.sidebar.transitions-ready {
    transition: width 0.3s ease !important;
}

.sidebar.transitions-ready .sidebar-content {
    transition: opacity 0.3s ease, visibility 0.3s ease !important;
}

/* ===== SCROLLBAR STYLES ===== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary, #f1f1f1);
}

::-webkit-scrollbar-thumb {
    background: #c0c7cf;
    border-radius: 6px;
    border: 3px solid var(--color-bg-tertiary, #f1f1f1);
}

::-webkit-scrollbar-thumb:hover {
    background: #a0a9b3;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 300px;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 280px;
        --sidebar-collapsed: 50px;
        --spacing-xl: 16px;
        --spacing-xxl: 20px;
    }
    
    .header-controls {
        left: 15px;
        right: 15px;
    }
    
    .header-controls .badge {
        padding: 6px 15px;
        font-size: var(--font-size-sm, 13px);
    }
    
    .tab-btn {
        padding: 6px 12px;
        font-size: var(--font-size-sm, 13px);
    }
    
    #container {
        padding: 15px;
    }
    
    .nav-link {
        padding: 6px 10px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    :root {
        --sidebar-width: 250px;
    }
    
    .header-controls {
        top: 10px;
        left: 10px;
        right: 10px;
    }
    
    .header-controls .badge {
        padding: 4px 10px;
        font-size: 12px;
    }
    
    .tab-btn {
        padding: 4px 8px;
        font-size: 12px;
    }
    
    .sidebar-header {
        padding: 12px;
    }
    
    .sidebar-content {
        padding: 12px;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .sidebar,
    .header-controls {
        display: none !important;
    }
    
    .main-content {
        margin: 0;
        padding: 0;
        background: white;
    }
    
    #container svg {
        background: white;
        border: 1px solid #000;
        box-shadow: none;
    }
    
    .node text {
        fill: black;
    }
    
    .connection path {
        stroke: #666 !important;
    }
}

/* ===== FOCUS STATES ===== */
.sidebar-toggle:focus-visible,
.tab-btn:focus-visible,
.nav-link:focus-visible,
.radio-label input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== HINDI FONT SUPPORT ===== */
.hindi-active .node text,
.hindi-active .instructions,
.hindi-active .content-info,
.hindi-active .nav-link,
.hindi-active .nav-section-title,
.hindi-active .section h3,
.hindi-active .radio-label,
.hindi-active .footer {
    font-family: var(--font-family-hindi);
}