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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Python Code Guide</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link
href="https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500&family=Inter:wght@400;500;600;700&family=Outfit:wght@600;700;800&display=swap"
rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css"
id="prism-theme">
<style>
:root {
--bg-gradient: linear-gradient(135deg, #0f172a, #1e1b4b);
--sidebar-bg: rgba(15, 23, 42, 0.6);
--card-bg: rgba(30, 41, 59, 0.7);
--card-hover: rgba(51, 65, 85, 0.8);
--text-main: #f8fafc;
--text-muted: #94a3b8;
--primary: #8b5cf6;
--primary-hover: #7c3aed;
--primary-glow: rgba(139, 92, 246, 0.15);
--success: #10b981;
--success-glow: rgba(16, 185, 129, 0.15);
--accent-pink: #ec4899;
--accent-gold: #f59e0b;
--border-color: rgba(255, 255, 255, 0.08);
--shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
--font-display: 'Outfit', sans-serif;
--font-body: 'Inter', sans-serif;
--font-mono: 'Fira Code', monospace;
/* Dynamic layout theme variables */
--header-bg: rgba(15, 23, 42, 0.25);
--content-bg: rgba(15, 23, 42, 0.15);
--code-bg: #0f172a;
--code-border: rgba(255, 255, 255, 0.05);
--copy-btn-bg: rgba(255, 255, 255, 0.1);
--copy-btn-border: rgba(255, 255, 255, 0.15);
--copy-btn-color: #ffffff;
--copy-btn-hover-bg: rgba(255, 255, 255, 0.2);
--list-input-bg: rgba(15, 23, 42, 0.3);
--turtle-playground-bg: rgba(15, 23, 42, 0.4);
--turtle-wrapper-bg: #1e293b;
}
/* Light Theme overrides */
html.light-theme {
--bg-gradient: linear-gradient(135deg, #f8fafc, #eff6ff);
--sidebar-bg: rgba(255, 255, 255, 0.8);
--card-bg: rgba(255, 255, 255, 0.9);
--card-hover: #ffffff;
--text-main: #0f172a;
--text-muted: #64748b;
--primary: #6366f1;
--primary-hover: #4f46e5;
--primary-glow: rgba(99, 102, 241, 0.1);
--border-color: rgba(0, 0, 0, 0.08);
--shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
/* Dynamic layout theme variables for light theme */
--header-bg: rgba(255, 255, 255, 0.45);
--content-bg: rgba(255, 255, 255, 0.15);
--code-bg: #f8fafc;
--code-border: rgba(0, 0, 0, 0.06);
--copy-btn-bg: rgba(0, 0, 0, 0.05);
--copy-btn-border: rgba(0, 0, 0, 0.08);
--copy-btn-color: #0f172a;
--copy-btn-hover-bg: rgba(0, 0, 0, 0.1);
--list-input-bg: #ffffff;
--turtle-playground-bg: rgba(255, 255, 255, 0.45);
--turtle-wrapper-bg: #f8fafc;
}
* {
box-sizing: border-box;
margin: 0;
padding: 0;
transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
}
body {
background: var(--bg-gradient);
color: var(--text-main);
font-family: var(--font-body);
min-height: 100vh;
display: flex;
flex-direction: column;
overflow-x: hidden;
}
/* Navigation header */
header {
background: var(--header-bg);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
border-bottom: 1px solid var(--border-color);
padding: 16px 24px;
display: flex;
justify-content: space-between;
align-items: center;
z-index: 10;
position: sticky;
top: 0;
}
.brand {
display: flex;
align-items: center;
gap: 12px;
font-family: var(--font-display);
font-weight: 800;
font-size: 1.4rem;
background: linear-gradient(135deg, #a78bfa, var(--accent-pink));
-webkit-background-clip: text;
background-clip: text;
-webkit-text-fill-color: transparent;
}
.brand span {
background: var(--primary);
color: white;
font-size: 0.75rem;
padding: 2px 8px;
border-radius: 20px;
-webkit-text-fill-color: white;
margin-left: 6px;
}
.header-actions {
display: flex;
align-items: center;
gap: 16px;
}
.header-icon-link {
align-items: center;
background: var(--card-bg);
border: 1px solid var(--border-color);
border-radius: 50%;
box-shadow: var(--shadow);
display: inline-flex;
height: 40px;
justify-content: center;
transition: transform 0.2s ease, background 0.2s ease;
width: 40px;
}
.header-icon-link:hover {
background: var(--primary-glow);
transform: translateY(-1px);
}
.header-icon-link img {
display: block;
height: 24px;
object-fit: contain;
width: 24px;
}
.theme-btn {
background: var(--card-bg);
border: 1px solid var(--border-color);
color: var(--text-main);
padding: 8px 16px;
border-radius: 20px;
font-weight: 600;
font-size: 0.85rem;
cursor: pointer;
display: flex;
align-items: center;
gap: 6px;
box-shadow: var(--shadow);
}
.theme-btn:hover {
transform: translateY(-1px);
background: var(--primary-glow);
}
/* App container */
.app-container {
display: flex;
flex: 1;
height: calc(100vh - 65px);
position: relative;
}
/* Sidebar navigation */
.sidebar {
width: 280px;
background: var(--sidebar-bg);
backdrop-filter: blur(16px);
-webkit-backdrop-filter: blur(16px);
border-right: 1px solid var(--border-color);
display: flex;
flex-direction: column;
overflow-y: auto;
padding: 20px 12px;
gap: 6px;
}
.nav-section {
display: flex;
flex-direction: column;
gap: 4px;
}
.nav-section-toggle {
width: 100%;
display: flex;
align-items: center;
justify-content: space-between;
gap: 10px;
padding: 10px 12px;
border: 1px solid var(--border-color);
border-radius: 10px;
background: rgba(255, 255, 255, 0.04);
color: var(--text-main);
font-family: var(--font-body);
font-size: 0.78rem;
font-weight: 800;
text-align: left;
text-transform: uppercase;
letter-spacing: 0.04em;
cursor: pointer;
}
.nav-section-toggle:hover {
background: var(--primary-glow);
border-color: var(--primary);
}
.nav-section-arrow {
color: var(--text-muted);
font-size: 0.8rem;
transition: transform 0.2s ease;
}
.nav-section.collapsed .nav-section-arrow {
transform: rotate(-90deg);
}
.nav-section-items {
display: flex;
flex-direction: column;
gap: 4px;
padding: 2px 0 8px 8px;
}
.nav-section.collapsed .nav-section-items {
display: none;
}
.nav-btn {
display: flex;
align-items: center;
gap: 12px;
padding: 10px 14px;
border: none;
background: transparent;
color: var(--text-muted);
border-radius: 10px;
font-family: var(--font-body);
font-weight: 600;
font-size: 0.95rem;
text-align: left;
cursor: pointer;
}
.nav-btn:hover {
background: rgba(255, 255, 255, 0.05);
color: var(--text-main);
}
.nav-btn.active {
background: var(--primary);
color: white;
box-shadow: 0 4px 12px var(--primary-glow);
}
/* Content Area */
.content-area {
flex: 1;
overflow-y: auto;
padding: 32px;
background: var(--content-bg);
}
.tab-content {
display: none;
max-width: 800px;
margin: 0 auto;
flex-direction: column;
gap: 24px;
animation: fadeIn 0.4s ease-out;
}
@keyframes fadeIn {
from {
opacity: 0;
transform: translateY(10px);
}
to {
opacity: 1;
transform: translateY(0);
}
}
.tab-content.active {
display: flex;
}
/* Cards */
.card {
background: var(--card-bg);
border: 1px solid var(--border-color);
border-radius: 16px;
padding: 24px;
box-shadow: var(--shadow);
display: flex;
flex-direction: column;
gap: 16px;
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
}
.card:hover {
background: var(--card-hover);
}
.card h2 {
font-family: var(--font-display);
font-weight: 700;
font-size: 1.5rem;
color: var(--text-main);
display: flex;
align-items: center;
gap: 10px;
}
.card p {
font-size: 0.95rem;
line-height: 1.6;
color: var(--text-muted);
}
.card strong {
color: var(--text-main);
}
.manual-interactive {
background: var(--turtle-playground-bg);
border: 1px solid var(--border-color);
border-radius: 12px;
padding: 16px;
display: flex;
flex-direction: column;
gap: 12px;
}
.manual-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
gap: 12px;
}
.manual-field {
display: flex;
flex-direction: column;
gap: 6px;
}
.manual-field label {
font-size: 0.82rem;
font-weight: 700;
color: var(--text-muted);
}
.manual-result,
.manual-log {
background: var(--code-bg);
color: var(--text-main);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 10px 12px;
min-height: 42px;
font-size: 0.9rem;
line-height: 1.4;
}
.manual-log {
color: #e2e8f0;
font-family: var(--font-mono);
font-size: 0.78rem;
}
html.light-theme .manual-result {
background: #f8fafc;
color: var(--text-main);
}
html.light-theme .manual-log {
background: #f8fafc;
color: #0f172a;
border-color: #dbe3ef;
font-weight: 700;
line-height: 1.5;
}
.manual-ok {
color: var(--success);
font-weight: 800;
}
.manual-details {
border: 1px solid var(--border-color);
border-radius: 10px;
background: rgba(15, 23, 42, 0.18);
overflow: hidden;
}
.manual-details + .manual-details {
margin-top: 12px;
}
html.light-theme .manual-details {
background: #f8fafc;
}
.manual-details summary {
cursor: pointer;
color: var(--text-main);
font-weight: 800;
padding: 11px 12px;
user-select: none;
}
.manual-details .code-wrapper {
margin: 0 12px 12px;
}
.manual-bad {
color: #ef4444;
font-weight: 800;
}
.viz-stage {
min-height: 120px;
display: flex;
align-items: center;
gap: 10px;
padding: 14px;
background: var(--code-bg);
border: 1px solid var(--border-color);
border-radius: 12px;
overflow-x: auto;
}
html.light-theme .viz-stage {
background: #ffffff;
}
.sort-stage {
min-height: 180px;
align-items: end;
}
.recursion-stage {
height: 360px;
min-height: 360px;
align-items: stretch;
display: grid;
grid-template-columns: minmax(180px, 1fr) minmax(180px, 1fr);
gap: 14px;
overflow: hidden;
}
.recursion-panel {
background: rgba(15, 23, 42, 0.36);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 12px;
display: flex;
flex-direction: column;
gap: 10px;
min-width: 0;
min-height: 0;
overflow: hidden;
}
html.light-theme .recursion-panel {
background: #f8fafc;
}
.recursion-panel h3 {
margin: 0;
font-size: 0.95rem;
color: var(--text-main);
}
.recursion-stack,
.recursion-return-list {
display: flex;
flex-direction: column;
gap: 8px;
overflow-y: auto;
padding-right: 2px;
}
.recursion-frame,
.recursion-return-step {
border: 1px solid var(--border-color);
border-radius: 8px;
background: var(--card-bg);
color: var(--text-main);
padding: 9px 10px;
display: flex;
justify-content: space-between;
gap: 10px;
align-items: center;
font-family: var(--font-mono);
font-size: 0.8rem;
}
.recursion-frame.active,
.recursion-return-step.active {
border-color: var(--accent-blue);
box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.22);
}
.recursion-frame.base {
border-color: var(--success);
box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.18);
}
.recursion-return-step {
background: rgba(34, 197, 94, 0.12);
}
.oop-intro-stage {
min-height: 300px;
display: grid;
grid-template-columns: minmax(180px, 1fr) 70px minmax(220px, 1fr);
gap: 14px;
align-items: stretch;
overflow: hidden;
}
.oop-intro-panel {
background: rgba(15, 23, 42, 0.36);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 12px;
display: flex;
flex-direction: column;
gap: 10px;
min-width: 0;
}
html.light-theme .oop-intro-panel {
background: #f8fafc;
}
.oop-intro-panel h3 {
margin: 0;
color: var(--text-main);
font-size: 0.95rem;
}
.oop-loose-list,
.oop-object-list {
display: flex;
flex-direction: column;
gap: 8px;
}
.oop-loose-row,
.oop-object-card,
.oop-blueprint {
border: 1px solid var(--border-color);
border-radius: 8px;
background: var(--card-bg);
color: var(--text-main);
padding: 9px 10px;
font-family: var(--font-mono);
font-size: 0.78rem;
line-height: 1.45;
}
.oop-loose-row,
.oop-blueprint,
.oop-object-card,
.oop-arrow-column {
transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.oop-arrow-column {
display: flex;
align-items: center;
justify-content: center;
color: var(--primary);
font-size: 2rem;
font-weight: 900;
opacity: 0.25;
}
.oop-blueprint {
border-color: var(--primary);
box-shadow: 0 0 0 2px var(--primary-glow);
opacity: 0.28;
transform: translateY(8px);
}
.oop-object-card {
position: relative;
overflow: hidden;
opacity: 0.24;
transform: translateY(10px);
}
.oop-object-card strong {
color: var(--success);
}
.oop-intro-stage.step-1 .oop-loose-row {
border-color: rgba(239, 68, 68, 0.45);
box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.12);
}
.oop-intro-stage.step-2 .oop-arrow-column,
.oop-intro-stage.step-3 .oop-arrow-column,
.oop-intro-stage.step-4 .oop-arrow-column,
.oop-intro-stage.step-5 .oop-arrow-column {
opacity: 1;
transform: scale(1.08);
}
.oop-intro-stage.step-2 .oop-blueprint,
.oop-intro-stage.step-3 .oop-blueprint,
.oop-intro-stage.step-4 .oop-blueprint,
.oop-intro-stage.step-5 .oop-blueprint {
opacity: 1;
transform: translateY(0);
box-shadow: 0 0 0 3px var(--primary-glow);
}
.oop-intro-stage.step-3 .oop-object-card:nth-child(1),
.oop-intro-stage.step-4 .oop-object-card:nth-child(1),
.oop-intro-stage.step-5 .oop-object-card:nth-child(1) {
opacity: 1;
transform: translateY(0);
}
.oop-intro-stage.step-4 .oop-object-card:nth-child(2),
.oop-intro-stage.step-5 .oop-object-card:nth-child(2) {
opacity: 1;
transform: translateY(0);
}
.oop-intro-stage.step-5 .oop-object-card:nth-child(3) {
opacity: 1;
transform: translateY(0);
}
.oop-intro-stage.step-5 .oop-loose-row {
opacity: 0.55;
transform: translateX(8px);
}
.sort-bar {
width: 44px;
min-width: 38px;
background: #dbeafe;
border: 2px solid #93c5fd;
border-radius: 8px 8px 0 0;
color: #0f172a;
display: flex;
align-items: flex-end;
justify-content: center;
padding-bottom: 8px;
font-weight: 800;
transition: height 0.25s ease, background 0.25s ease, border-color 0.25s ease;
}
.sort-bar.active {
background: #fef3c7;
border-color: #f59e0b;
}
.sort-bar.sorted {
background: #dcfce7;
border-color: #22c55e;
}
.sort-bar.key {
background: #ede9fe;
border-color: #8b5cf6;
}
@media (max-width: 760px) {
.recursion-stage {
grid-template-columns: 1fr;
}
.oop-intro-stage {
grid-template-columns: 1fr;
}
.oop-arrow-column {
min-height: 40px;
transform: rotate(90deg);
}
}
.big-o-layout {
display: grid;
grid-template-columns: minmax(0, 1.5fr) minmax(220px, 0.8fr);
gap: 16px;
align-items: stretch;
}
.big-o-chart {
min-height: 330px;
background: var(--code-bg);
border: 1px solid var(--border-color);
border-radius: 12px;
padding: 14px;
display: flex;
align-items: stretch;
}
html.light-theme .big-o-chart {
background: #ffffff;
}
.big-o-chart svg {
width: 100%;
min-height: 300px;
overflow: visible;
}
.big-o-axis {
stroke: var(--text-muted);
stroke-width: 1.5;
}
.big-o-gridline {
stroke: rgba(148, 163, 184, 0.22);
stroke-width: 1;
}
.big-o-line {
fill: none;
stroke-width: 3;
stroke-linecap: round;
stroke-linejoin: round;
}
.big-o-label {
fill: var(--text-main);
font-size: 11px;
font-family: var(--font-body);
font-weight: 700;
}
.big-o-controls {
display: flex;
flex-direction: column;
gap: 12px;
}
.big-o-toggle-list {
display: grid;
gap: 8px;
}
.big-o-toggle {
display: flex;
align-items: center;
gap: 8px;
color: var(--text-muted);
font-size: 0.86rem;
font-weight: 700;
}
.big-o-toggle input {
accent-color: var(--primary);
}
.big-o-chip {
width: 12px;
height: 12px;
border-radius: 999px;
flex-shrink: 0;
}
.big-o-readout {
display: grid;
gap: 8px;
max-height: 210px;
overflow-y: auto;
}
.big-o-readout-row {
display: grid;
grid-template-columns: 74px 1fr auto;
gap: 8px;
align-items: center;
color: var(--text-muted);
font-size: 0.8rem;
}
.big-o-meter {
height: 8px;
background: rgba(148, 163, 184, 0.2);
border-radius: 999px;
overflow: hidden;
}
.big-o-meter span {
display: block;
height: 100%;
border-radius: inherit;
}
.big-o-examples {
display: grid;
grid-template-columns: minmax(0, 1fr);
gap: 12px;
}
.big-o-example {
border: 1px solid var(--border-color);
border-radius: 12px;
padding: 14px;
background: rgba(255, 255, 255, 0.02);
display: flex;
flex-direction: column;
gap: 8px;
}
.big-o-example h3 {
color: var(--text-main);
font-family: var(--font-display);
font-size: 1rem;
margin: 0;
}
@media (max-width: 860px) {
.big-o-layout {
grid-template-columns: 1fr;
}
}
.adt-node,
.adt-op,
.adt-slot {
border-radius: 12px;
padding: 12px 14px;
min-width: 78px;
text-align: center;
font-weight: 800;
color: #0f172a;
position: relative;
flex-shrink: 0;
}
.adt-node {
background: #e0f2fe;
border: 2px solid #0284c7;
}
.adt-node.highlight {
background: #dcfce7;
border-color: #22c55e;
}
.adt-node.warn {
background: #fee2e2;
border-color: #ef4444;
}
.adt-op {
background: #ede9fe;
border: 2px solid #7c3aed;
}
.adt-slot {
background: #ffffff;
border: 2px solid #cbd5e1;
}
.adt-arrow {
color: var(--text-muted);
font-weight: 900;
font-size: 1.3rem;
flex-shrink: 0;
}
.adt-pointer {
display: block;
font-size: 0.7rem;
color: #475569;
margin-top: 4px;
}
.tree-visualiser-box {
border: 1px solid var(--border-color);
border-radius: 14px;
background: var(--turtle-playground-bg);
padding: 14px;
overflow: hidden;
display: flex;
flex-direction: column;
gap: 12px;
}
.tree-visualiser-controls {
display: flex;
gap: 8px;
flex-wrap: wrap;
align-items: center;
}
.tree-visualiser-svg {
width: 100%;
height: 360px;
background: #ffffff;
border-radius: 12px;
border: 1px solid #e2e8f0;
}
.tree-visualiser-svg .tree-edge {
stroke: #94a3b8;
stroke-width: 2;
}
.tree-visualiser-svg .tree-node circle {
fill: #dbeafe;
stroke: #2563eb;
stroke-width: 2;
}
.tree-visualiser-svg .tree-node text {
font-size: 13px;
font-weight: 700;
fill: #0f172a;
text-anchor: middle;
dominant-baseline: middle;
}
.tree-visualiser-svg .tree-node.highlight circle {
fill: #fef3c7;
stroke: #d97706;
stroke-width: 3;
}
@media (max-width: 640px) {
.tree-visualiser-svg {
height: 300px;
}
}
.grid-picker-table {
border-collapse: collapse;
width: 100%;
max-width: 620px;
background: var(--card-bg);
border: 1px solid var(--border-color);
border-radius: 12px;
overflow: hidden;
}
.grid-picker-table th,
.grid-picker-table td {
border: 1px solid var(--border-color);
padding: 10px;
text-align: center;
min-width: 48px;
}
.grid-picker-table th {
background: var(--primary-glow);
color: var(--text-main);
font-size: 0.78rem;
font-weight: 800;
}
.grid-picker-table td {
color: var(--text-main);
font-weight: 800;
cursor: pointer;
transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}