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

:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent-color: #1e40af;
    --accent-hover: #1e3a8a;
    --accent-light: #eff6ff;
    --success-color: #15803d;
    --success-bg: #f0fdf4;
    --warning-color: #b45309;
    --danger-color: #b91c1c;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
}

.dashboard-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    flex-shrink: 0;
    z-index: 10;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 2.25rem;
    height: 2.25rem;
    background-color: var(--accent-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-text h1 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-color);
}

.logo-text span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: block;
    margin-top: -2px;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex-grow: 1;
    overflow-y: auto;
}

.nav-item button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.nav-item button:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
}

.nav-item.active button {
    background-color: var(--accent-light);
    color: var(--accent-color);
    font-weight: 600;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.header-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.content-body {
    flex-grow: 1;
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Info Cards */
.info-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.resume-content p {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    text-align: justify;
}

.resume-list {
    margin-left: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.resume-list li {
    margin-bottom: 0.35rem;
}

.best-practice-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bp-item {
    display: flex;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.bp-icon {
    font-weight: bold;
    flex-shrink: 0;
}

.bp-icon.do {
    color: var(--success-color);
}

.bp-icon.dont {
    color: var(--danger-color);
}

.bp-text strong {
    color: var(--text-primary);
    display: block;
}

.bp-text span {
    color: var(--text-secondary);
}

/* Interactive Case Study Section */
.case-study-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.case-study-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1px;
}

.cs-tab {
    padding: 0.5rem 1.25rem;
    border: 1px solid transparent;
    background: none;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    transition: all 0.2s ease;
    margin-bottom: -1px;
}

.cs-tab:hover {
    color: var(--text-primary);
    background-color: #f1f5f9;
}

.cs-tab.active {
    color: var(--accent-color);
    border-color: var(--border-color) var(--border-color) var(--bg-secondary);
    background-color: var(--bg-secondary);
}

.cs-container {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 1.5rem;
    align-items: stretch;
}

.cs-visualizer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 420px;
}

.controls-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    padding: 1rem;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.controls-panel label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.controls-panel input[type="text"],
.controls-panel input[type="number"],
.controls-panel select {
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    background-color: white;
}

.controls-panel input[type="text"]:focus,
.controls-panel input[type="number"]:focus,
.controls-panel select:focus {
    border-color: var(--accent-color);
}

.btn {
    padding: 0.4rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    outline: none;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.btn-secondary {
    background-color: #f1f5f9;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #166534;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #991b1b;
}

.output-panel {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: #f8fafc;
    flex-grow: 1;
    position: relative;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.visual-canvas {
    width: 100%;
    height: 100%;
    min-height: 280px;
    background-color: white;
    border-radius: var(--radius-sm);
    border: 1px solid #f1f5f9;
    position: relative;
    overflow: hidden;
}

/* SVG Rendering styles */
.node-circle {
    fill: var(--accent-light);
    stroke: var(--accent-color);
    stroke-width: 2;
    transition: all 0.3s ease;
}

.node-circle.active {
    fill: #fef08a;
    stroke: var(--warning-color);
    stroke-width: 3;
}

.node-circle.success {
    fill: var(--success-bg);
    stroke: var(--success-color);
    stroke-width: 3;
}

.node-text {
    font-size: 11px;
    font-weight: bold;
    fill: var(--text-primary);
    text-anchor: middle;
    dominant-baseline: middle;
    font-family: inherit;
}

.edge-line {
    stroke: #94a3b8;
    stroke-width: 2;
    transition: all 0.3s ease;
}

.edge-line.active {
    stroke: var(--warning-color);
    stroke-width: 3;
}

.edge-line.success {
    stroke: var(--success-color);
    stroke-width: 3;
}

.edge-weight {
    font-size: 10px;
    font-weight: 600;
    fill: #475569;
    text-anchor: middle;
    background-color: white;
}

/* Source Code Panel */
.cs-code {
    display: flex;
    flex-direction: column;
}

.code-header {
    background-color: #1e293b;
    color: #e2e8f0;
    padding: 0.65rem 1rem;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.code-lang {
    color: #38bdf8;
    font-family: 'Fira Code', monospace;
}

.code-container {
    background-color: #0f172a;
    color: #f8fafc;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    line-height: 1.45;
    padding: 1rem;
    margin: 0;
    flex-grow: 1;
    max-height: 380px;
}

.code-container pre {
    margin: 0;
}

/* Specific component visual styling */
.linked-list-node-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    flex-wrap: wrap;
}

.ll-node {
    display: flex;
    border: 2px solid var(--accent-color);
    background-color: white;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    animation: slideIn 0.3s ease;
}

.ll-node.highlighted {
    border-color: var(--warning-color);
    transform: scale(1.05);
}

.ll-data {
    padding: 0.5rem 0.75rem;
    font-weight: bold;
    font-size: 0.9rem;
    background-color: var(--accent-light);
    color: var(--accent-color);
    min-width: 45px;
    text-align: center;
}

.ll-next {
    padding: 0.5rem 0.5rem;
    border-left: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    background-color: #f8fafc;
    display: flex;
    align-items: center;
    font-family: monospace;
}

.ll-arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    font-weight: bold;
    animation: fadeIn 0.4s ease;
}

/* History Box */
.history-ui {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.browser-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: #f1f5f9;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.browser-address {
    flex-grow: 1;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Stack UI */
.stack-ui-container {
    display: flex;
    gap: 2rem;
    width: 100%;
    justify-content: space-around;
    padding: 1rem;
}

.stack-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 45%;
}

.stack-box-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.stack-well {
    width: 100%;
    height: 220px;
    border: 3px solid var(--text-secondary);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    background-color: #f8fafc;
    display: flex;
    flex-direction: column-reverse;
    padding: 0.5rem;
    gap: 0.35rem;
    overflow-y: auto;
}

.stack-element {
    background-color: var(--accent-light);
    color: var(--accent-color);
    border: 1.5px solid var(--accent-color);
    border-radius: var(--radius-sm);
    padding: 0.35rem;
    text-align: center;
    font-weight: bold;
    font-size: 0.8rem;
    box-shadow: var(--shadow-sm);
    animation: dropIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Queue UI */
.queue-ui-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 2rem;
    width: 100%;
    overflow-x: auto;
}

.queue-label-box {
    font-size: 0.75rem;
    font-weight: bold;
    padding: 0.25rem 0.5rem;
    background-color: #e2e8f0;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

.queue-element {
    background-color: #f0fdf4;
    color: var(--success-color);
    border: 2px solid var(--success-color);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-weight: bold;
    font-size: 0.85rem;
    min-width: 70px;
    text-align: center;
    animation: slideIn 0.3s ease;
}

/* Sorting Bars */
.sorting-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 0.25rem;
    width: 100%;
    height: 100%;
    padding: 1rem;
}

.sorting-bar {
    background-color: var(--accent-color);
    width: 25px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height 0.15s ease, background-color 0.15s ease;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 0.25rem;
}

.sorting-bar-label {
    font-size: 8px;
    color: white;
    font-weight: bold;
}

.sorting-bar.active {
    background-color: var(--warning-color);
}

.sorting-bar.sorted {
    background-color: var(--success-color);
}

/* Searching Blocks */
.search-block-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 1rem;
}

.search-block {
    width: 42px;
    height: 42px;
    border: 1px solid var(--border-color);
    background-color: white;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.search-block.checking {
    background-color: #fef08a;
    border-color: var(--warning-color);
    transform: scale(1.1);
}

.search-block.found {
    background-color: var(--success-bg);
    border-color: var(--success-color);
    color: var(--success-color);
    transform: scale(1.1);
}

.search-block.dead {
    background-color: #f1f5f9;
    color: #94a3b8;
    border-color: #cbd5e1;
}

/* Keyframes Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-15px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes dropIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Status message banner */
.status-banner {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 0.5rem;
    display: none;
}

.status-banner.success {
    display: block;
    background-color: var(--success-bg);
    color: var(--success-color);
    border: 1px solid #bbf7d0;
}

.status-banner.error {
    display: block;
    background-color: #fee2e2;
    color: var(--danger-color);
    border: 1px solid #fecaca;
}

.status-banner.info {
    display: block;
    background-color: #f0f9ff;
    color: #0369a1;
    border: 1px solid #bae6fd;
}