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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, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
<title>Interactive Periodic Table & Chemical Equation Balancer | Free Chemistry Tool – Zperiod</title>
<!-- SEO Meta Tags -->
<meta name="description"
content="Zperiod is a free interactive chemistry platform with an animated periodic table, 3D atom models, a chemical equation balancer, empirical formula calculator, and exam-ready tools for Grade 9-12 students.">
<meta name="keywords"
content="periodic table, interactive periodic table, chemistry elements, chemical equation balancer, balance chemical equations, empirical formula calculator, molar mass calculator, 3D atom model, chemistry learning tool, free chemistry tool, ion table, chemistry education">
<meta name="author" content="Philip">
<meta name="robots" content="index, follow, max-image-preview:large">
<link rel="canonical" href="https://zperiod.app/">
<!-- Open Graph (Facebook, LinkedIn, Discord, Reddit) -->
<meta property="og:title" content="Interactive Periodic Table & Chemical Equation Balancer | Zperiod">
<meta property="og:description"
content="Free interactive chemistry platform with 3D atom models, a chemical equation balancer, empirical formula calculator, and 118 elements at your fingertips.">
<meta property="og:type" content="website">
<meta property="og:url" content="https://zperiod.app/">
<meta property="og:image" content="https://zperiod.app/images/preview-modal.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Zperiod interactive periodic table showing a 3D atom model">
<meta property="og:site_name" content="Zperiod">
<meta property="og:locale" content="en_US">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Interactive Periodic Table & Chemical Equation Balancer | Zperiod">
<meta name="twitter:description"
content="Free interactive chemistry platform with 3D atom models, equation balancer, and 118 elements.">
<meta name="twitter:image" content="https://zperiod.app/images/preview-modal.png">
<meta name="twitter:image:alt" content="Zperiod interactive periodic table showing a 3D atom model">
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"description": "Free interactive periodic table with 3D atom models, chemical equation balancer, empirical formula calculator, and chemistry learning tools for Grade 9-12 students.",
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"featureList": [
"Interactive Periodic Table with 118 elements",
"3D Atom Models with electron shell visualization",
"Chemical Equation Balancer with scale animation",
"Empirical & Molecular Formula Calculator",
"Molar Mass Calculator",
"Ion Reference Table",
"Worksheet Generator with PDF export"
],
"educationalLevel": "Grade 9-12",
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"name": "Chemistry"
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<link rel="preconnect" href="https://fonts.googleapis.com">
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<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="css/base.css?v=2.1.2">
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<link rel="stylesheet" href="css/mobile-landing.css?v=2.1.8">
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<script type="text/javascript">
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<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-S4S9V7C7VQ"></script>
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</head>
<body>
<!-- Rotate Device Overlay (iPad portrait) -->
<div id="rotate-device-overlay" class="rotate-device-overlay">
<div class="rotate-device-content">
<div class="rotate-device-icon">
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<h2 class="rotate-device-title" data-i18n="mobile.rotateTitle">Rotate Your Device</h2>
<p class="rotate-device-text" data-i18n="mobile.rotateText">Zperiod works best in landscape mode on tablets.</p>
</div>
</div>
<!-- Desktop Only Overlay / Mobile Landing Page -->
<div id="desktop-only-overlay" class="desktop-only-overlay">
<!-- Fallback for desktop (hidden by CSS) -->
<div class="desktop-only-content">
<h2 class="desktop-only-title" data-i18n="mobile.desktopOnlyTitle">Desktop Experience Only</h2>
<p class="desktop-only-text" data-i18n="mobile.desktopOnlyText">Please access Zperiod on a desktop browser.</p>
</div>
<!-- Mobile Landing Page -->
<div class="mobile-landing">
<!-- Hero Section -->
<section class="ml-hero">
<div class="ml-hero-bg"></div>
<div class="ml-bg-stream" id="ml-bg-stream" aria-hidden="true"></div>
<div class="ml-hero-content">
<img src="logo.svg" alt="Zperiod – Interactive Periodic Table" class="ml-logo">
<h1 class="ml-title">Zperiod</h1>
<p class="ml-subtitle">Master Chemistry.<br>Visually & Instantly.</p>
<div class="ml-badge-row">
<span class="ml-badge">118 Elements</span>
<span class="ml-badge">3D Models</span>
<span class="ml-badge">Free</span>
</div>
</div>
<div class="ml-scroll-indicator">
<div class="ml-scroll-pill">
<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
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<span>Scroll down to explore</span>
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stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
<polyline points="6 9 12 15 18 9"></polyline>
</svg>
</div>
</div>
</section>
<!-- Section: Features -->
<div class="ml-section-header ml-reveal">
<span class="ml-section-label">Features</span>
<h2 class="ml-section-title">Everything you need<br>for Chemistry.</h2>
</div>
<section class="ml-features">
<!-- Feature 1: Periodic Table -->
<div class="ml-feature ml-reveal">
<div class="ml-feature-tag">Interactive</div>
<h3 class="ml-feature-title">Periodic Table</h3>
<p class="ml-feature-desc">All 118 elements with category color-coding, phase data at STP, and
instant access to comprehensive chemical information.</p>
<div class="ml-img-frame ml-img-frame-table">
<picture>
<source srcset="images/preview-table.avif" type="image/avif">
<img src="images/preview-table.png"
alt="Interactive periodic table with color-coded element categories and phase data"
loading="lazy" decoding="async" width="2940" height="1846">
</picture>
</div>
</div>
<!-- Feature 2: Atom Models -->
<div class="ml-feature ml-reveal">
<div class="ml-feature-tag">3D Visualization</div>
<h3 class="ml-feature-title">Atom Models</h3>
<p class="ml-feature-desc">Interactive 3D atom structures with electron shells, swipeable info
cards, and detailed properties for every element.</p>
<div class="ml-img-frame ml-img-frame-modal">
<picture>
<source srcset="images/mobile-atom-2.png?v=1" type="image/png">
<img src="images/mobile-atom-2.png?v=1"
alt="3D atom model showing electron shells and element properties" loading="lazy"
decoding="async" width="2940" height="1846">
</picture>
</div>
</div>
<!-- Feature 3: Chemistry Tools -->
<div class="ml-feature ml-reveal">
<div class="ml-feature-tag">Chemistry Tools</div>
<h3 class="ml-feature-title">Tools Workspace</h3>
<p class="ml-feature-desc">A cleaner tools workspace with faster access to balancing, molar mass,
solubility, and virtual lab workflows.</p>
<div class="ml-img-frame ml-img-frame-tools">
<picture>
<source srcset="images/preview-tools.avif" type="image/avif">
<img src="images/preview-tools.png"
alt="Updated chemistry tools workspace on mobile" loading="lazy"
decoding="async" width="2940" height="1846">
</picture>
</div>
</div>
<!-- Feature 4: Worksheet -->
<div class="ml-feature ml-reveal">
<div class="ml-feature-tag">Education</div>
<h3 class="ml-feature-title">Worksheet Generator</h3>
<p class="ml-feature-desc">Generate print-ready balanced equation worksheets with adjustable
difficulty, multiple reaction types, and PDF export.</p>
<div class="ml-img-frame ml-img-frame-worksheet">
<picture>
<source srcset="images/preview-worksheet.avif" type="image/avif">
<img src="images/preview-worksheet.png"
alt="Chemistry worksheet generator with balanced equation exercises" loading="lazy"
decoding="async" width="2940" height="1846">
</picture>
</div>
</div>
</section>
<!-- Stats Strip -->
<section class="ml-stats ml-reveal">
<div class="ml-stat">
<span class="ml-stat-number">118</span>
<span class="ml-stat-label">Elements</span>
</div>
<div class="ml-stat">
<span class="ml-stat-number">50+</span>
<span class="ml-stat-label">Ions</span>
</div>
<div class="ml-stat">
<span class="ml-stat-number">4</span>
<span class="ml-stat-label">Tools</span>
</div>
<div class="ml-stat">
<span class="ml-stat-number">3D</span>
<span class="ml-stat-label">Atoms</span>
</div>
</section>
<!-- CTA -->
<section class="ml-cta ml-reveal">
<div class="ml-cta-card">
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<h2 class="ml-cta-title">Best on Desktop</h2>
<p class="ml-cta-text">Zperiod is a professional-grade educational tool. For the full interactive 3D
experience, visit on a desktop browser.</p>
<a href="https://zperiod.app" class="ml-cta-btn">Visit zperiod.app</a>
</div>
</section>
<!-- Footer -->
<footer class="ml-footer">
<img src="logo.svg" alt="Zperiod logo" class="ml-footer-logo">
<p>© 2026 Philip. All rights reserved.</p>
</footer>
</div>
</div>
<!-- Welcome Intro Modal -->
<div id="welcome-modal" class="modal-overlay">
<div class="modal-content welcome-redesign">
<div class="modal-top-buttons">
<button class="modal-close" id="welcome-close-btn" aria-label="Close welcome dialog" data-i18n-aria-label="aria.closeWelcomeDialog">×</button>
</div>
<div class="about-container">
<!-- Left: Product Preview - Apple Style Minimal -->
<div class="about-left">
<div class="about-content-wrapper">
<span class="welcome-eyebrow" data-i18n="welcome.eyebrow">Introducing</span>
<h1 class="welcome-title">Zperiod</h1>
<h2 class="welcome-subtitle"><span data-i18n="welcome.subtitleLine1">Master Chemistry.</span><br><span data-i18n="welcome.subtitleLine2">Visually & Instantly.</span></h2>
<p class="welcome-description" data-i18n="welcome.description">
The interactive periodic table designed for Grade 9-12 students.
Stop memorizing — start visualizing.
</p>
<div class="welcome-features">
<span class="feature-pill" data-i18n="welcome.pill1">Interactive Atoms</span>
<span class="feature-pill" data-i18n="welcome.pill2">Ion Engine</span>
<span class="feature-pill" data-i18n="welcome.pill3">Exam Ready</span>
</div>
<button id="welcome-start-btn" class="welcome-cta" data-i18n="welcome.cta">
Get Started
</button>
<div
style="display: flex; align-items: center; justify-content: space-between; margin-top: 10px;">
<p class="welcome-footer" style="margin: 0;" data-i18n="welcome.footer">v2.0 · Precision Lab Edition</p>
<button id="show-changelog-btn" title="View Update History" data-i18n-title="welcome.viewUpdateHistory"
style="width: 28px; height: 28px; border-radius: 50%; border: none; background: rgba(99,102,241,0.1); color: #6366f1; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.2s;">
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</div>
</div>
</div>
<!-- Right: Author Profile -->
<div class="about-right">
<div class="author-card">
<div class="logos-connector">
<div class="logo-circle z-logo">
<img src="logo.svg" alt="Zperiod">
</div>
<div class="connector-line"></div>
<div class="logo-circle school-logo">
<img src="image.png" alt="Aurora High School">
</div>
</div>
<div class="author-details">
<h2>Philip Zhao</h2>
<span class="author-role" data-i18n="welcome.authorRole">Creator & Full Stack Developer</span>
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<span data-i18n="welcome.schoolInfo">Aurora High School · Grade 11 (2027)</span>
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<span data-i18n="welcome.location">Toronto, Canada</span>
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<span class="email-text">zhilips123123@gmail.com</span>
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<span class="email-text">440016162@gapps.yrdsb.ca</span>
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<!-- ===== Changelog Modal (shown once per version for ALL users) ===== -->
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<!-- Left: Header & CTA (reuses welcome layout) -->
<div class="about-left" style="flex: 1;">
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<span class="welcome-eyebrow" data-i18n="changelog.eyebrow">What's New</span>
<h1 class="welcome-title">v2.0</h1>
<h2 class="welcome-subtitle"><span data-i18n="changelog.subtitleLine1">Version 2.0.</span><br><span data-i18n="changelog.subtitleLine2">Guided Chemistry Experience.</span></h2>
<p class="welcome-description" data-i18n="changelog.description">
Guided tutorials are now available across every chemistry tool and every element detail page, with a new virtual lab, removed legacy tool clutter, and expanded language coverage.
</p>
<div class="welcome-features">
<span class="feature-pill" data-i18n="changelog.pill1">Virtual Lab</span>
<span class="feature-pill" data-i18n="changelog.pill2">Guided Tours</span>
<span class="feature-pill" data-i18n="changelog.pill3">Multilingual</span>
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Got it — Let's go!
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<p class="welcome-footer" data-i18n="changelog.footerDate">April 1, 2026</p>
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<!-- Right: Changelog Cards -->
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style="flex: 1.5; background: #fff; padding: 40px 55px; border-radius: 0 32px 32px 0; display: flex; align-items: center;">
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<span class="changelog-badge badge-new" data-i18n="changelog.badgeNew">NEW</span>
<div class="changelog-card-content">
<strong data-i18n="changelog.card1Title">Interactive Virtual Lab</strong>
<p data-i18n="changelog.card1Body">A brand-new virtual chemistry lab has been added for playful, hands-on exploration with real-time physics interactions.
</p>
</div>
</div>
<div class="changelog-card">
<span class="changelog-badge badge-ui" data-i18n="changelog.badgeUi">UI</span>
<div class="changelog-card-content">
<strong data-i18n="changelog.card2Title">Guided Interactive Tutorials</strong>
<p data-i18n="changelog.card2Body">Every chemistry tool and every element detail page now includes step-by-step guided tutorials.</p>
</div>
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<div class="changelog-card">
<span class="changelog-badge badge-perf" data-i18n="changelog.badgePerf">LANG</span>
<div class="changelog-card-content">
<strong data-i18n="changelog.card3Title">Expanded Multilingual Support</strong>
<p data-i18n="changelog.card3Body">Core pages, tools, and key chemistry content have been translated more completely across supported languages.</p>
</div>
</div>
<div class="changelog-card">
<span class="changelog-badge badge-data" data-i18n="changelog.badgeData">DATA</span>
<div class="changelog-card-content">
<strong data-i18n="changelog.card4Title">Tool Workspace Cleanup</strong>
<p data-i18n="changelog.card4Body">A redundant legacy tool has been removed to keep the tools workspace cleaner and easier to use.</p>
</div>
</div>
<div class="changelog-card">
<span class="changelog-badge badge-ui" data-i18n="changelog.badgeUi">UI</span>
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<strong data-i18n="changelog.card5Title">Refresh & Stability</strong>
<p data-i18n="changelog.card5Body">Release-based forced reload is enabled so all users receive the newest features, translations, and fixes immediately.</p>
</div>
</div>
</div>
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</div>
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</div>
<!-- Visually hidden H1 for desktop app (SEO) -->
<h1 class="sr-only">Zperiod – Interactive Periodic Table & Chemical Equation Balancer</h1>
<!-- Global Fixed Navigation -->
<nav class="global-nav" id="global-nav">
<!-- 左侧：品牌区 -->
<div class="nav-brand-section">
<a href="#" class="nav-logo-link" data-page="table">
<img src="logo.svg" alt="Zperiod home" class="nav-logo">
</a>
<a href="#" class="nav-brand" data-page="table">Zperiod</a>
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<!-- 中间：版本切换 + 导航链接 -->
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<div class="version-dropdown" id="version-dropdown">
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<button class="nav-pill-btn" data-page="settings" data-i18n="nav.settings">Settings</button>
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</div>
<!-- 右侧：语言切换 + 元素搜索 -->
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placeholder="Search..." autocomplete="off" spellcheck="false" data-i18n-placeholder="search.placeholder" />
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</div>
</div>
</nav>
<div class="container" id="main-container">
<div class="periodic-table" id="periodic-table">
</div>
</div>
<!-- Ions Table Page -->
<div id="ions-page" class="blank-page ions-table-page">
<div class="container ions-container">
<div class="periodic-table ions-table" id="ions-table">
<!-- Ion cards will be generated by JavaScript -->
</div>
</div>
</div>
<!-- Chemistry Tools Page (Blank Page 1) -->
<div id="blank-page-1" class="blank-page chemistry-tools-page">
<div class="blank-page-content" id="page-tools">
<div class="chem-tools-container">
<h1 class="chem-tools-title" data-i18n="tools.pageTitle">Chemistry Tools</h1>
<p class="chem-tools-subtitle" data-i18n="tools.pageSubtitle">Grade 9-12 Chemistry Calculators</p>
<div class="chem-tools-grid">
<!-- Equation Balancer (Position 1) -->
<div class="chem-tool-card" data-tool="balancer">
<div class="chem-tool-header">
<div class="chem-tool-icon-box balancer-icon">
<span class="chem-tool-number">1</span>
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"
stroke-linecap="round" stroke-linejoin="round">
<path d="M12 3v18" />
<path d="M3 9l9-4 9 4" />
<path d="M3 9v4c0 2 2 4 4 4s4-2 4-4" />
<path d="M21 9v4c0 2-2 4-4 4s-4-2-4-4" />
<line x1="8" y1="21" x2="16" y2="21" />
</svg>
</div>
<span class="chem-tool-arrow">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<line x1="5" y1="12" x2="19" y2="12"></line>
<polyline points="12 5 19 12 12 19"></polyline>
</svg>
</span>
</div>
<div class="chem-tool-info">
<h3 class="chem-tool-name" data-i18n="tools.balancerName">Equation Balancer</h3>
<p class="chem-tool-desc" data-i18n="tools.balancerDesc">Balance complex chemical equations automatically with visual
stoichiometry feedback.</p>
</div>
</div>
<!-- Molar Mass Calculator (Position 2) -->
<div class="chem-tool-card" data-tool="molar-mass">
<div class="chem-tool-header">
<div class="chem-tool-icon-box molar-icon">
<span class="chem-tool-number">2</span>
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"
stroke-linecap="round" stroke-linejoin="round">
<rect x="4" y="4" width="16" height="16" rx="3" ry="3" />
<line x1="8" y1="9" x2="16" y2="9" />
<line x1="8" y1="13" x2="10" y2="13" />
<line x1="14" y1="13" x2="16" y2="13" />
<line x1="8" y1="17" x2="10" y2="17" />
<line x1="14" y1="17" x2="16" y2="17" />
</svg>
</div>
<span class="chem-tool-arrow">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<line x1="5" y1="12" x2="19" y2="12"></line>
<polyline points="12 5 19 12 12 19"></polyline>
</svg>
</span>
</div>
<div class="chem-tool-info">
<h3 class="chem-tool-name" data-i18n="tools.molarMassName">Molar Mass</h3>
<p class="chem-tool-desc" data-i18n="tools.molarMassDesc">Instantly compute molecular weights with a detailed
element-by-element mass breakdown.</p>
</div>
</div>
<!-- Solubility Table (Position 3) -->
<div class="chem-tool-card" data-tool="solubility">
<div class="chem-tool-header">
<div class="chem-tool-icon-box solubility-icon"
style="background:linear-gradient(135deg, #d1f4e0 0%, #a7f3d0 100%);">
<span class="chem-tool-number">3</span>
<svg viewBox="0 0 24 24" fill="none" stroke="#059669" stroke-width="2"
stroke-linecap="round" stroke-linejoin="round">
<path d="M4.5 3h15" />
<path d="M6 3v16a2 2 0 0 0 2 2h8a2 2 0 0 0 2-2V3" />
<path d="M6 14h12" />
<circle cx="10" cy="18" r="1.5" fill="#059669" stroke="none" />
<circle cx="14" cy="16" r="1.5" fill="#059669" stroke="none" />
</svg>
</div>
<span class="chem-tool-arrow">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<line x1="5" y1="12" x2="19" y2="12"></line>
<polyline points="12 5 19 12 12 19"></polyline>
</svg>
</span>
</div>
<div class="chem-tool-info">
<h3 class="chem-tool-name" data-i18n="tools.solubilityName">Solubility Table</h3>
<p class="chem-tool-desc" data-i18n="tools.solubilityDesc">Quickly reference interactive charts and rules for ionic compound
solubilities.</p>
</div>
</div>
<!-- Virtual Lab (Position 4) -->
<div class="chem-tool-card" data-tool="virtual-lab">
<div class="chem-tool-header">
<div class="chem-tool-icon-box"
style="background:linear-gradient(135deg, #dbeafe 0%, #e9d5ff 52%, #dcfce7 100%); color:#312e81;">
<span class="chem-tool-number">4</span>
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"
stroke-linecap="round" stroke-linejoin="round">
<path d="M10 2v5l-4.5 7.5A4 4 0 0 0 8.9 21h6.2a4 4 0 0 0 3.4-6.5L14 7V2" />
<path d="M8 11h8" />
<path d="M9 15c1.2.4 2.5.6 3.8.6 1 0 2-.1 2.9-.4" />
</svg>
</div>
<span class="chem-tool-arrow">
<svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<line x1="5" y1="12" x2="19" y2="12"></line>
<polyline points="12 5 19 12 12 19"></polyline>
</svg>
</span>
</div>
<div class="chem-tool-info">
<h3 class="chem-tool-name" data-i18n="tools.virtualLabName">Virtual Lab</h3>
<p class="chem-tool-desc" data-i18n="tools.virtualLabDesc">Tilt a beaker and watch pseudo-liquid particles move and spill naturally.</p>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Page 2: Worksheet Generator -->
<div id="blank-page-2" class="blank-page">
<div class="worksheet-generator-page">
<div class="worksheet-container">
<!-- Left Panel: Controls -->
<div class="worksheet-controls">
<div class="controls-header">
<h2 data-i18n="worksheet.title">Worksheet Generator</h2>
<p data-i18n="worksheet.subtitle">Create balanced equation worksheets for your class</p>
</div>
<!-- Number of Questions -->
<div class="control-group">
<label data-i18n="worksheet.numQuestions">Number of Questions</label>
<div class="button-group" id="question-count-group">
<button class="option-btn" data-value="5">5</button>
<button class="option-btn active" data-value="10">10</button>
<button class="option-btn" data-value="20">20</button>
<button class="option-btn" data-value="30">30</button>
<button class="option-btn" data-value="50">50</button>
</div>
</div>
<!-- Reaction Types -->
<div class="control-group">
<label data-i18n="worksheet.reactionTypes">Reaction Types</label>
<div class="checkbox-group" id="reaction-types-group">
<label class="checkbox-option">
<input type="checkbox" value="synthesis" checked>
<div class="checkbox-text-wrapper">
<span data-i18n="worksheet.synthesis">Synthesis</span>
<span class="checkbox-subtitle">A + B → AB</span>
</div>
</label>
<label class="checkbox-option">
<input type="checkbox" value="decomposition" checked>
<div class="checkbox-text-wrapper">
<span data-i18n="worksheet.decomposition">Decomposition</span>
<span class="checkbox-subtitle">AB → A + B</span>
</div>
</label>
<label class="checkbox-option">
<input type="checkbox" value="single-replacement">
<div class="checkbox-text-wrapper">
<span data-i18n="worksheet.singleReplacement">Single Replacement</span>
<span class="checkbox-subtitle">A + BC → AC + B</span>
</div>
</label>
<label class="checkbox-option">
<input type="checkbox" value="double-replacement">
<div class="checkbox-text-wrapper">
<span data-i18n="worksheet.doubleReplacement">Double Replacement</span>
<span class="checkbox-subtitle">AB + CD → AD + CB</span>
</div>
</label>
<label class="checkbox-option">
<input type="checkbox" value="combustion">
<div class="checkbox-text-wrapper">
<span data-i18n="worksheet.combustion">Combustion</span>
<span class="checkbox-subtitle">Hydrocarbon + O₂</span>
</div>
</label>
</div>
</div>
<!-- Difficulty -->
<div class="control-group">
<label data-i18n="worksheet.difficulty">Difficulty</label>
<div class="button-group" id="difficulty-group">
<button class="option-btn" data-value="easy" data-i18n="worksheet.easy">Easy</button>
<button class="option-btn active" data-value="medium" data-i18n="worksheet.medium">Medium</button>
<button class="option-btn" data-value="hard" data-i18n="worksheet.hard">Hard</button>
</div>
</div>
<!-- Generate Button -->
<button class="generate-btn" id="generate-worksheet-btn">
<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2">
<path
d="M12 3v1m0 16v1m-9-9h1m16 0h1m-2.64-6.36l-.7.7m-12.02 12.02l-.7.7m0-12.72l.7.7m12.02 12.02l.7.7" />
<circle cx="12" cy="12" r="4" />
</svg>
<span data-i18n="worksheet.generate">Generate Worksheet</span>
</button>
<div class="trust-text" data-i18n="worksheet.trustText">Questions are generated from real, commonly taught reactions.</div>
</div>
<!-- Right Panel: Preview -->
<div class="worksheet-preview">
<div class="preview-header">
<div class="preview-tabs">
<button class="preview-tab active" data-mode="student" data-i18n="worksheet.print">Print</button>
<button class="preview-tab" data-mode="practice" data-i18n="worksheet.practice">Practice</button>
<button class="preview-tab" data-mode="answer" data-i18n="worksheet.answerKey">Answer Key</button>
</div>
<div class="export-buttons">
<button class="export-btn" id="export-pdf-btn" disabled>
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2">
<path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
<polyline points="14 2 14 8 20 8"></polyline>
<line x1="16" y1="13" x2="8" y2="13"></line>
<line x1="16" y1="17" x2="8" y2="17"></line>
<polyline points="10 9 9 9 8 9"></polyline>
</svg>
<span data-i18n="worksheet.print">Print</span>
</button>
<button class="export-btn" id="fill-date-btn" disabled>
<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="2">
<rect x="3" y="4" width="18" height="18" rx="2" ry="2"></rect>
<line x1="16" y1="2" x2="16" y2="6"></line>
<line x1="8" y1="2" x2="8" y2="6"></line>
<line x1="3" y1="10" x2="21" y2="10"></line>
</svg>
<span data-i18n="worksheet.today">Today</span>
</button>
</div>
</div>
<div class="preview-content" id="worksheet-preview-content">
<div class="preview-placeholder">
<svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor"
stroke-width="1.5">
<path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
<polyline points="14 2 14 8 20 8"></polyline>
<line x1="16" y1="13" x2="8" y2="13"></line>
<line x1="16" y1="17" x2="8" y2="17"></line>
<line x1="10" y1="9" x2="8" y2="9"></line>
</svg>
<p data-i18n="worksheet.placeholder">Click 'Generate Worksheet' to create practice problems</p>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Page 5: Settings -->
<div id="settings-page" class="blank-page">
<div class="settings-viewport" id="page-settings">
<!-- Left column: quick links -->
<aside class="sv-sidebar">
<div class="sv-links-group">
<a href="https://github.com/Zhilips/Zperiod" target="_blank" rel="noopener noreferrer" class="sv-link-card sv-link-card-github">
<div class="sv-link-card-icon">
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<main class="sv-main">
<!-- Global Units control -->
<section class="sv-card sv-card-units">
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<div class="sv-icon-circle sv-unit-icon">
<svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
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<h3 data-i18n="settings.globalUnits">Global Units</h3>
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<div class="sv-anim-controls sv-unit-controls">
<div class="sv-anim-row sv-unit-row">
<span class="sv-anim-label sv-unit-label" data-i18n="settings.temperature">Temperature</span>
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<button class="nav-pill-btn active unit-setting-btn" data-type="temp" data-idx="0">°C</button>
<button class="nav-pill-btn unit-setting-btn" data-type="temp" data-idx="1">°F</button>
<button class="nav-pill-btn unit-setting-btn" data-type="temp" data-idx="2">K</button>
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<span class="sv-anim-label sv-unit-label" data-i18n="settings.density">Density</span>
<div class="global-nav-pill sv-unit-pill">
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<button class="nav-pill-btn active unit-setting-btn" data-type="density" data-idx="0">g/cm³</button>