/* Graph Paper Generator - Unified Styles with Theme Support */

/* Color Scheme Variables - Dark Mode (Default) */
:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #444;
    --nav-bg: #0066cc;
    --nav-hover: #0052a3;
    --button-bg: #0066cc;
    --button-hover: #0052a3;
    --link-color: #5599ff;
    --link-hover: #77aaff;
    --footer-bg: #1a1a1a;
    --footer-border: #333;
    --info-box-bg: #1a3a4a;
    --info-box-border: #0066cc;
    --info-box-text: #99ccff;
    --warning-box-bg: #3a3a1a;
    --warning-box-border: #cc9900;
    --warning-box-text: #ffdd77;
    --success-box-bg: #1a3a1a;
    --success-box-border: #00aa00;
    --success-box-text: #88ff88;
    --tip-box-bg: #1a3a1a;
    --tip-box-border: #28a745;
    --tip-box-text: #88ff88;
    --faq-item-bg: #2a2a2a;
    --contact-card-bg: #2a2a2a;
    --contact-card-border: #0066cc;
    --preview-container-bg: #2d2d2d;
    --preview-container-border: #444;

    /* Graph paper preview - ALWAYS LIGHT */
    --preview-bg: #ffffff;
    --preview-border: #000000;
    --preview-text: #000000;
}

/* Light Mode Override */
@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #f5f5f5;
        --bg-secondary: #ffffff;
        --bg-tertiary: #f8f9fa;
        --text-primary: #333333;
        --text-secondary: #555555;
        --text-tertiary: #777777;
        --border-color: #ddd;
        --nav-bg: #007bff;
        --nav-hover: #0056b3;
        --button-bg: #007bff;
        --button-hover: #0056b3;
        --link-color: #007bff;
        --link-hover: #0056b3;
        --footer-bg: #333333;
        --footer-border: #555;
        --info-box-bg: #e7f3ff;
        --info-box-border: #007bff;
        --info-box-text: #0c5aa6;
        --warning-box-bg: #fff3cd;
        --warning-box-border: #ffc107;
        --warning-box-text: #856404;
        --success-box-bg: #d4edda;
        --success-box-border: #28a745;
        --success-box-text: #155724;
        --tip-box-bg: #d4edda;
        --tip-box-border: #28a745;
        --tip-box-text: #155724;
        --faq-item-bg: #f8f9fa;
        --contact-card-bg: #f8f9fa;
        --contact-card-border: #007bff;
        --preview-container-bg: #ffffff;
        --preview-container-border: #ddd;

        /* Graph paper preview - ALWAYS LIGHT */
        --preview-bg: #ffffff;
        --preview-border: #000000;
        --preview-text: #000000;
    }
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation Styles */
nav {
    background: var(--nav-bg);
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

nav .nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-decoration: none;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 25px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    transition: opacity 0.3s;
}

nav ul li a:hover {
    opacity: 0.8;
}

/* Main Container */
.container {
    max-width: 1200px;
    margin: 40px auto;
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease;
}

/* Typography */
h1 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 36px;
}

h2 {
    color: var(--text-primary);
    margin: 30px 0 15px 0;
    font-size: 28px;
}

h3 {
    color: var(--text-primary);
    margin: 25px 0 10px 0;
    font-size: 22px;
}

h4 {
    color: var(--text-secondary);
    margin: 20px 0 10px 0;
    font-size: 18px;
}

p {
    color: var(--text-secondary);
    margin: 15px 0;
    font-size: 16px;
}

.subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin: 10px 0 30px 0;
    line-height: 1.4;
}

.effective-date {
    color: var(--text-tertiary);
    font-style: italic;
    margin-bottom: 20px;
}

/* Links */
a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Controls and Forms */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.control-group {
    display: flex;
    flex-direction: column;
}

label {
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--text-primary);
}

input, select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    min-height: 44px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

input:focus, select:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

/* Buttons */
button {
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    margin: 10px 5px;
    min-height: 44px;
    min-width: 44px;
    transition: background-color 0.3s ease;
}

button:hover {
    background: var(--button-hover);
}

button:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

.buttons {
    text-align: center;
    margin-top: 20px;
}

/* Info Boxes */
.info-box, .info {
    background: var(--info-box-bg);
    padding: 15px 20px;
    border-radius: 6px;
    border-left: 4px solid var(--info-box-border);
    margin: 20px 0;
    color: var(--info-box-text);
    transition: background-color 0.3s ease;
}

.important-box {
    background: var(--warning-box-bg);
    border-left: 4px solid var(--warning-box-border);
    padding: 15px 20px;
    margin: 20px 0;
    color: var(--warning-box-text);
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.privacy-commitment {
    background: var(--success-box-border);
    color: white;
    padding: 20px;
    border-radius: 6px;
    margin: 25px 0;
    font-size: 18px;
    text-align: center;
}

.tip-box {
    background: var(--tip-box-bg);
    border-left: 4px solid var(--tip-box-border);
    padding: 15px 20px;
    margin: 25px 0;
    color: var(--tip-box-text);
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.highlight-box {
    background: var(--info-box-bg);
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid var(--info-box-border);
    margin: 20px 0;
    color: var(--info-box-text);
    transition: background-color 0.3s ease;
}

/* Preview Container - ALWAYS LIGHT FOR PRINTING */
.preview-container {
    border: 2px solid var(--preview-container-border);
    margin: 20px 0;
    background: var(--preview-container-bg);
    overflow: auto;
    max-height: 600px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
    border-radius: 6px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#preview {
    border: 1px solid var(--preview-border);
    background: var(--preview-bg) !important; /* Always white */
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

/* Lists */
ul {
    color: var(--text-secondary);
    margin: 15px 0;
    padding-left: 30px;
}

ul li {
    margin: 8px 0;
}

/* FAQ Styles */
.faq-item {
    margin: 25px 0;
    padding: 20px;
    background: var(--faq-item-bg);
    border-left: 4px solid var(--link-color);
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.faq-item h3, .faq-item h4 {
    color: var(--link-color);
    margin: 0 0 10px 0;
}

.faq-item p {
    color: var(--text-secondary);
    margin: 10px 0;
}

/* Contact Cards */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.contact-card {
    background: var(--contact-card-bg);
    padding: 25px;
    border-radius: 6px;
    border-top: 3px solid var(--contact-card-border);
    transition: background-color 0.3s ease;
}

.contact-card h3 {
    margin-top: 0;
    color: var(--link-color);
}

.contact-card ul {
    list-style: none;
    padding: 0;
    margin: 15px 0 0 0;
}

.contact-card ul li {
    margin: 10px 0;
    color: var(--text-secondary);
}

/* Contact Form */
.contact-form-section {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: 8px;
    margin: 30px 0;
    border: 1px solid var(--border-color);
}

.contact-form-section h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--link-color);
    font-size: 24px;
}

.contact-form-section > p {
    margin-top: 0;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.contact-form {
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 24px;
}

.form-group label {
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 15px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: Arial, sans-serif;
    font-size: 15px;
    min-height: 48px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    border-color: var(--link-color);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-tertiary);
    opacity: 0.7;
}

.form-group textarea {
    resize: vertical;
    min-height: 160px;
    line-height: 1.5;
    padding-top: 12px;
}

.btn-submit {
    background-color: var(--button-bg);
    color: #ffffff;
    padding: 14px 40px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    min-height: 48px;
    transition: background-color 0.3s ease, transform 0.1s ease;
    margin-top: 10px;
}

.btn-submit:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-submit:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Mobile responsiveness for contact form */
@media (max-width: 768px) {
    .contact-form-section {
        padding: 25px 20px;
    }

    .form-group {
        margin-bottom: 20px;
    }

    .form-group input,
    .form-group textarea {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .btn-submit {
        width: 100%;
        padding: 14px 20px;
    }
}

/* About Section */
.about {
    padding: 20px;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 20px;
}

.feature-column h4 {
    margin-top: 0;
}

.feature-column ul {
    padding-left: 35px;
}

.feature-column li {
    margin: 10px 0;
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: white;
    padding: 40px 0 20px 0;
    margin-top: 60px;
}

footer .footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

footer h3 {
    color: white;
    margin-bottom: 15px;
    font-size: 18px;
}

footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

footer ul {
    list-style: none;
    padding: 0;
}

footer ul li {
    margin: 8px 0;
}

footer a {
    color: #99ccff;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

footer .copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--footer-border);
    color: #aaa;
    font-size: 14px;
}

footer p {
    line-height: 1.6;
    color: #ddd;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    nav ul {
        gap: 15px;
        flex-wrap: wrap;
    }

    nav ul li a {
        font-size: 14px;
    }

    .container {
        margin: 20px 10px;
        padding: 20px;
    }

    .controls {
        grid-template-columns: 1fr;
        gap: 15px;
        padding: 15px;
    }

    input, select {
        font-size: 16px;
        padding: 12px;
    }

    button {
        padding: 14px 20px;
        margin: 8px 0;
        width: 100%;
        font-size: 18px;
    }

    .buttons {
        display: flex;
        flex-direction: column;
        gap: 10px;
        margin-top: 15px;
    }

    .preview-container {
        padding: 10px;
        margin: 15px 0;
        max-height: 70vh;
    }

    .info, .info-box, .important-box, .tip-box, .highlight-box {
        padding: 12px;
        margin-bottom: 15px;
        font-size: 14px;
        line-height: 1.4;
    }

    .subtitle {
        font-size: 16px;
        margin: 8px 0 20px 0;
    }

    h1 {
        font-size: 28px;
    }

    h2 {
        font-size: 20px;
        margin: 20px 0 10px 0;
    }

    h3 {
        font-size: 18px;
        margin: 20px 0 8px 0;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    footer {
        margin-top: 30px;
        padding-top: 20px;
    }
}

/* Content Page Styles - Common across guides, tutorials, types */
.recommendation-box,
.decision-tree,
.tips-box,
.practice-box,
.use-case-box,
.example-box,
.mistake-box,
.comparison-table-wrapper,
.ideas-box,
.getting-started-box {
    margin: 25px 0;
    padding: 20px;
    border-radius: 6px;
    border-left: 4px solid;
}

.recommendation-box {
    background: var(--success-box-bg);
    border-left-color: var(--success-box-border);
}

.recommendation-box h3 {
    color: var(--success-box-text);
    margin-top: 0;
}

.tips-box,
.practice-box,
.use-case-box {
    background: var(--tip-box-bg);
    border-left-color: var(--tip-box-border);
}

.tips-box h4,
.practice-box h3,
.use-case-box h3 {
    color: var(--tip-box-text);
    margin-top: 0;
}

.example-box,
.ideas-box {
    background: var(--info-box-bg);
    border-left-color: var(--info-box-border);
}

.example-box h4,
.ideas-box h3 {
    color: var(--info-box-text);
    margin-top: 0;
}

.mistake-box {
    background: var(--warning-box-bg);
    border-left-color: var(--warning-box-border);
}

.mistake-box h3,
.mistake-box h4 {
    color: var(--warning-box-text);
    margin-top: 0;
}

.decision-tree {
    background: var(--bg-secondary);
    border-left-color: var(--nav-bg);
    border: 1px solid var(--border-color);
    border-left-width: 4px;
}

.decision-tree h3,
.decision-tree h4 {
    color: var(--text-primary);
    margin-top: 0;
}

.cta-box {
    margin: 40px 0;
    padding: 30px;
    background: var(--bg-secondary);
    border: 2px solid var(--nav-bg);
    border-radius: 8px;
    text-align: center;
}

.cta-box h3 {
    margin-top: 0;
    color: var(--text-primary);
}

.cta-button {
    display: inline-block;
    padding: 12px 30px;
    background: var(--button-bg);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: background 0.3s, transform 0.2s;
}

.cta-button:hover {
    background: var(--button-hover);
    transform: translateY(-2px);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--bg-secondary);
}

.comparison-table th,
.comparison-table td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
}

.comparison-table th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

.comparison-table tr:hover {
    background: var(--bg-tertiary);
}

.value-table {
    width: 100%;
    max-width: 600px;
    margin: 20px auto;
    border-collapse: collapse;
    background: var(--bg-secondary);
}

.value-table th,
.value-table td {
    border: 1px solid var(--border-color);
    padding: 10px;
    text-align: center;
}

.value-table th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Blog Styles */
.blog-intro {
    margin: 30px 0;
}

.blog-categories {
    margin: 40px 0;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.15);
}

.category-card h3 {
    color: var(--text-primary);
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.3em;
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95em;
}

.category-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-card ul li {
    margin: 8px 0;
}

.category-card ul li a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s;
}

.category-card ul li a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.popular-articles {
    margin: 40px 0;
}

.article-list {
    display: grid;
    gap: 25px;
    margin-top: 20px;
}

.article-preview {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--nav-bg);
    padding: 25px;
    border-radius: 4px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-preview:hover {
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.1);
}

.article-preview h3 {
    margin-top: 0;
    margin-bottom: 12px;
}

.article-preview h3 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.article-preview h3 a:hover {
    color: var(--nav-bg);
}

.article-preview p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
}

.read-more {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.read-more:hover {
    color: var(--link-hover);
}

.getting-started {
    margin: 40px 0;
    padding: 25px;
    background: var(--info-box-bg);
    border-left: 4px solid var(--info-box-border);
    border-radius: 4px;
}

.getting-started h2 {
    margin-top: 0;
    color: var(--info-box-text);
}

.subscribe-section {
    margin: 40px 0;
    padding: 30px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-align: center;
}

.subscribe-section h2 {
    margin-top: 0;
    color: var(--text-primary);
}

.subscribe-section p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Print Styles */
@media print {
    body {
        background-color: white;
    }

    body * {
        visibility: hidden;
    }

    #preview, #preview * {
        visibility: visible;
    }

    #preview {
        position: absolute;
        left: 0;
        top: 0;
        margin: 0 !important;
        box-shadow: none !important;
        border: none !important;
        background: white !important;
    }

    @page {
        margin: 0;
    }
}