:root {
    /* Colors */
    --bg-main: #ebedf0;
    --win-light: #ffffff;
    --win-gray: #c0c0c0;
    --win-dark: #808080;
    --win-border-dark: #404040;
    --accent-navy: #000080;
    --accent-teal: #008080;
    --status-green: #00ff00;
    --text-main: #1a1a1a;
    --text-dim: #555555;

    /* Fonts */
    --font-heading: 'Courier Prime', Courier, monospace;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;

    /* Spacing */
    --pad-sm: 8px;
    --pad-md: 16px;
    --pad-lg: 32px;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.window-container {
    display: flex;
    width: 95vw;
    height: 90vh;
    max-width: 1200px;
    background-color: var(--win-gray);
    border: 2px solid var(--win-border-dark);
    box-shadow: 4px 4px 0px var(--win-dark);
}

/* Sidebar */
.sidebar {
    width: 240px;
    background-color: var(--win-gray);
    border-right: 2px solid var(--win-dark);
    padding: var(--pad-md);
    display: flex;
    flex-direction: column;
}

.logo {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: var(--pad-lg);
    border-bottom: 2px solid var(--accent-navy);
}

.logo a {
    text-decoration: none;
    color: var(--accent-navy);
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: var(--pad-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 1.1rem;
    padding: 4px 8px;
    display: block;
    border: 1px solid transparent;
}

.nav-links a:hover, .nav-links a.active {
    background-color: var(--accent-navy);
    color: white;
    border: 1px solid white;
}

.highlight-link {
    font-weight: bold;
    color: var(--accent-teal) !important;
}

/* Content Window */
.content-window {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--win-light);
    margin: 4px;
    border: 2px inset white;
    overflow-y: auto;
}

.content-header {
    background-color: var(--accent-navy);
    color: white;
    padding: 4px 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--status-green);
    border-radius: 50%;
    box-shadow: 0 0 4px var(--status-green);
}

.window-controls {
    display: flex;
    gap: 4px;
}

.win-btn {
    width: 16px;
    height: 16px;
    background-color: var(--win-gray);
    border: 1px outset white;
    cursor: pointer;
}

.win-btn:active {
    border: 1px inset white;
}

/* Page Body */
.page-body {
    padding: var(--pad-lg);
    max-width: 800px;
    margin: 0 auto;
}

h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    letter-spacing: -2px;
    color: var(--accent-navy);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--accent-teal);
    margin-bottom: var(--pad-lg);
}

.intro-text {
    font-size: 1.1rem;
    color: var(--text-dim);
    margin-bottom: var(--pad-md);
}

.inset-v {
    border: 2px inset var(--win-dark);
    padding: var(--pad-md);
    background-color: #fafafa;
}

.outset-v {
    border: 2px outset white;
    padding: var(--pad-md);
    background-color: var(--win-gray);
}

.divider {
    border: 0;
    border-top: 1px solid var(--win-dark);
    border-bottom: 1px solid white;
    margin: var(--pad-lg) 0;
}

/* Grid & Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--pad-md);
    margin-top: var(--pad-md);
}

.card h4 {
    font-family: var(--font-heading);
    color: var(--accent-navy);
    margin-bottom: 8px;
}

/* Step List */
.step-list {
    list-style: none;
    margin-top: var(--pad-md);
}

.step-list li {
    display: flex;
    gap: var(--pad-md);
    margin-bottom: var(--pad-md);
}

.step-num {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: bold;
    color: var(--win-dark);
    opacity: 0.3;
}

.step-content {
    padding-top: 8px;
}

/* Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-heading);
    background-color: white;
}

.window-header {
    background-color: var(--win-dark);
    color: white;
    padding: 2px 8px;
    font-size: 0.7rem;
    font-family: var(--font-heading);
}

.comparison-table th, .comparison-table td {
    padding: 8px;
    border: 1px solid var(--win-gray);
    text-align: left;
}

.comparison-table th {
    background-color: var(--bg-main);
}

/* Footer */
.final-message {
    margin-top: var(--pad-lg);
    text-align: center;
}

.footer-bottom {
    margin-top: var(--pad-md);
    display: flex;
    justify-content: space-between;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    color: var(--win-dark);
}

.footer-bottom a {
    color: var(--accent-navy);
}

/* Docs Section & File Manager */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 20px;
    padding: 20px;
    background-color: white;
    border: 2px inset gray;
    margin-top: var(--pad-md);
}

.file-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: black;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 10px;
    border: 1px solid transparent;
}

.file-item:hover {
    background-color: var(--accent-navy);
    color: white;
    border: 1px dotted white;
}

.file-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(to bottom right, #fff, #ccc);
    border: 2px solid #000;
    margin-bottom: 8px;
    position: relative;
    box-shadow: 2px 2px 0px rgba(0, 0, 0, 0.2);
}

.file-icon::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 12px 12px 0;
    border-color: transparent transparent #eee transparent;
}

.file-icon::after {
    content: "TXT";
    position: absolute;
    bottom: 2px;
    right: 2px;
    font-size: 10px;
    font-weight: bold;
    color: #666;
}

/* Document Viewer */
.doc-viewer-container {
    display: none; /* Hidden by default */
}

.viewer-header {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-btn {
    appearance: none;
    background: var(--win-gray);
    border: 2px outset white;
    padding: 4px 12px;
    font-family: var(--font-heading);
    cursor: pointer;
}

.back-btn:active {
    border: 2px inset white;
}

.doc-content {
    background-color: white;
    padding: var(--pad-lg);
    border: 2px inset gray;
    min-height: 400px;
}

.doc-content h1, .doc-content h2, .doc-content h3 {
    font-family: var(--font-heading);
    color: var(--accent-navy);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.doc-content pre {
    background-color: #f5f5f5;
    padding: 10px;
    border: 1px solid #ccc;
    overflow-x: auto;
    font-family: "Courier New", Courier, monospace;
    font-size: 0.9rem;
    margin: 1rem 0;
}

/* Transitions */
#docs-grid.hidden {
    display: none;
}
#doc-viewer.active {
    display: block;
}