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

/* Base: Variables */
:root {
    /* Brand Colors */
    --primary-cyan: #00bcd4;
    
    /* Layout Dimensions */
    --sidebar-width: 250px;
    --header-height: 60px;
    
    /* Theme Colors - Light (Default) */
    --bg-body: #FAFAFA;
    --bg-sidebar: #ffffff;
    --bg-header: #ffffff;
    --bg-footer: #ffffff;
    --bg-card: #ffffff;
    
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #555555;
    
    --border-color: #eeeeee;
    --shadow-color: rgba(0,0,0,0.1);
    
    /* Code Block */
    --code-bg: #2d2d2d;
    --code-header-bg: #1a1a1a;
    --code-text: #e0e0e0;
}

/* Base: Reset & Global */
body {
    background-color: var(--bg-body);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--primary-cyan);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Theme: Dark Mode */
[data-theme="dark"] {
    --bg-body: #090D3D;
    --bg-sidebar: #1A1F4D;
    --bg-header: #1A1F4D;
    --bg-footer: #1A1F4D;
    --bg-card: #1A1F4D;
    
    --text-primary: #E0E0E0;
    --text-secondary: #B0B0B0;
    --text-muted: #888888;
    
    --border-color: #2A2F5D;
    --shadow-color: rgba(0,0,0,0.5);
}

/* Base: Bootstrap Overrides (Must come after variables/theme) */
[data-theme="dark"] .text-dark {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .text-muted {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .text-secondary {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .bg-white {
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .bg-light {
    background-color: var(--bg-body) !important;
}

[data-theme="dark"] .border-bottom,
[data-theme="dark"] .border-top,
[data-theme="dark"] .border {
    border-color: var(--border-color) !important;
}

/* Layout: Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-body);
    transition: margin-left 0.3s ease-in-out;
}

@media (max-width: 768px) {
    .main-content {
        margin-left: 0;
        padding-top: calc(var(--header-height) + 20px);
    }
}

/* Component: Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    z-index: 1020;
    transition: transform 0.3s ease-in-out, background-color 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-cyan);
    text-decoration: none;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-link {
    display: block;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
    font-size: 1rem;
}

.nav-link:hover {
    background-color: rgba(0, 188, 212, 0.05);
    color: var(--primary-cyan);
}

.nav-link i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: 2px 0 10px var(--shadow-color);
    }

    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 1015;
    }
    
    .sidebar-overlay.active {
        display: block;
    }
}

/* Component: Header (Mobile) */
.mobile-header {
    display: none; /* Hidden on Desktop */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    z-index: 1010;
    align-items: center;
    justify-content: space-between;
    padding: 0 15px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 5px;
}

@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }
}

/* Component: Footer */
.footer {
    margin-top: auto;
    padding: 40px 0;
    background-color: var(--bg-footer);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.footer h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 15px;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer a:hover {
    color: var(--primary-cyan);
}

/* Component: Card */
.card {
    background-color: var(--bg-card);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    border: 1px solid var(--border-color);
}

.card-header {
    background-color: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.card-footer {
    background-color: var(--bg-footer);
    border-top: 1px solid var(--border-color);
    color: var(--text-primary);
}

.card-title a {
    color: var(--text-primary);
}

.card-title a:hover {
    color: var(--primary-cyan);
}

/* Component: Breadcrumb */
.breadcrumb {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 .125rem .25rem var(--shadow-color);
    display: flex;
    flex-wrap: wrap;
    list-style: none;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--text-muted);
    content: "/";
    padding: 0 0.5rem;
}

.breadcrumb-item a {
    color: var(--primary-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-item a:hover {
    color: var(--primary-cyan);
    text-decoration: underline;
    opacity: 0.8;
}

.breadcrumb-item.active {
    color: var(--text-secondary);
}

/* Component: Thinking Note */
.thinking-note-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 20px 0;
    padding-left: 20px;
    border-left: 3px solid var(--border-color);
}

.thinking-note-item {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.thinking-note-item:hover {
    box-shadow: 0 5px 15px rgba(0,188,212,0.1);
    border-color: rgba(0,188,212,0.3);
    transform: translateX(5px);
}

.thinking-note-item::before {
    content: '';
    position: absolute;
    left: -28px; /* Adjust based on padding-left of list and border */
    top: 25px;
    width: 12px;
    height: 12px;
    background: var(--bg-body);
    border: 3px solid var(--primary-cyan);
    border-radius: 50%;
    z-index: 1;
}

.thinking-note-title {
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
}

.thinking-note-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Component: Code Block */
.code-container {
    background: var(--code-bg);
    border-radius: 10px;
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
    margin: 20px 0;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
}

.code-header {
    background: var(--code-header-bg);
    padding: 12px 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #333;
}

.code-buttons {
    display: flex;
    gap: 8px;
}

.code-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    transition: transform 0.2s;
}
.code-btn:hover { transform: scale(1.1); }
.code-btn.red { background: #ff5f56; }
.code-btn.yellow { background: #ffbd2e; }
.code-btn.green { background: #27c93f; }

.code-lang {
    color: #666;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    user-select: none;
}

.code-container pre {
    margin: 0 !important;
    padding: 20px !important;
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    line-height: 1.6 !important;
    color: var(--code-text, #e0e0e0);
}

.code-container code {
    font-family: 'JetBrains Mono', 'Consolas', monospace !important;
    font-size: 14px !important;
    text-shadow: none !important;
}

/* Scrollbar for code block */
.code-container pre::-webkit-scrollbar {
    height: 8px;
    background-color: var(--code-bg);
}
.code-container pre::-webkit-scrollbar-thumb {
    background-color: #555;
    border-radius: 4px;
}

/* Component: Category Sidebar (Responsive) */
@media (max-width: 900px) {
    .category-toggle-btn {
        display: block !important;
        width: 100%;
        text-align: left;
        margin-bottom: 15px;
        position: relative;
        z-index: 1;
    }

    .category-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        height: 100vh;
        background-color: var(--bg-sidebar);
        z-index: 1050;
        transform: translateX(-100%);
        transition: transform 300ms ease-in-out;
        box-shadow: 2px 0 10px var(--shadow-color);
        overflow-y: auto;
        padding: 20px;
    }

    .category-sidebar.show {
        transform: translateX(0);
    }

    .sidebar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0,0,0,0.5);
        z-index: 1040;
        display: none;
        opacity: 0;
        transition: opacity 300ms ease-in-out;
    }

    .sidebar-backdrop.show {
        display: block;
        opacity: 1;
    }
}

@media (min-width: 901px) {
    .category-toggle-btn {
        display: none !important;
        }
    .sidebar-backdrop {
        display: none !important;
    }
}

/* Dark Mode Fixes for Bootstrap Components */
[data-theme="dark"] .list-group-item {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .list-group-item-action:hover,
[data-theme="dark"] .list-group-item-action:focus {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

[data-theme="dark"] .list-group-item.active {
    background-color: var(--primary-cyan);
    border-color: var(--primary-cyan);
    color: #fff;
}

/* Fix for Search Bar input group in dark mode */
[data-theme="dark"] .input-group-text {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

[data-theme="dark"] .form-control {
    background-color: var(--bg-card);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control:focus {
    background-color: var(--bg-card);
    border-color: var(--primary-cyan);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.25rem rgba(0, 188, 212, 0.25);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted);
}