/* Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #e74c3c;
    --accent-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --border-color: #ddd;
    --success-color: #27ae60;
    --warning-color: #f39c12;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: #fff;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1a252f 100%);
    color: #fff;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header .tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Navigation */
nav {
    background-color: var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0;
}

nav li {
    margin: 0;
}

nav a {
    display: block;
    color: #fff;
    text-decoration: none;
    padding: 15px 18px;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

nav a:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Main Content */
main {
    padding: 40px 20px;
}

section {
    margin-bottom: 60px;
    padding-top: 20px;
}

h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--secondary-color);
}

h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 25px 0 15px;
}

h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
}

/* Lists */
ul, ol {
    margin: 15px 0 20px 25px;
}

li {
    margin-bottom: 10px;
}

ul ul, ol ul {
    margin-top: 10px;
    margin-bottom: 10px;
}

/* Links */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Intro Section */
.intro-section {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

/* Tip Box */
.tip-box {
    background-color: #e8f6ff;
    border: 1px solid #b3d9f2;
    border-left: 4px solid var(--accent-color);
    padding: 20px;
    border-radius: 4px;
    margin: 25px 0;
}

.tip-box h4 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

/* Warning Box */
.warning-box {
    background-color: #fff8e6;
    border: 1px solid #ffe0a3;
    border-left: 4px solid var(--warning-color);
    padding: 20px;
    border-radius: 4px;
    margin: 25px 0;
}

.warning-box h4 {
    color: var(--warning-color);
    margin-bottom: 10px;
}

/* Product Callout */
.product-callout {
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    padding: 25px;
    border-radius: 8px;
    margin: 25px 0;
}

.product-callout h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    font-size: 0.95rem;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--primary-color);
    color: #fff;
    font-weight: 600;
}

tr:hover {
    background-color: var(--light-bg);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.tool-card {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.tool-card:hover {
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.tool-card h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.tool-card p {
    font-size: 0.95rem;
    margin-bottom: 12px;
}

/* Button */
.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
    margin-top: 10px;
}

.btn:hover {
    background-color: #c0392b;
    color: #fff;
    text-decoration: none;
}

/* FAQ Items */
.faq-item {
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px 25px;
    margin-bottom: 20px;
}

.faq-item h3 {
    margin-top: 0;
    color: var(--secondary-color);
}

/* Checklist */
.checklist {
    background-color: var(--light-bg);
    padding: 25px 30px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.checklist label {
    display: block;
    padding: 10px 0;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.checklist label:last-child {
    border-bottom: none;
}

.checklist label:hover {
    background-color: #fff;
    padding-left: 5px;
}

.checklist input[type="checkbox"] {
    margin-right: 12px;
    width: 18px;
    height: 18px;
    vertical-align: middle;
}

.checklist input[type="checkbox"]:checked + label,
.checklist label:has(input:checked) {
    color: var(--success-color);
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: #fff;
    padding: 30px 20px;
    text-align: center;
    margin-top: 40px;
}

footer p {
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.affiliate-disclosure {
    opacity: 0.8;
    font-size: 0.8rem !important;
    max-width: 600px;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 40px 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    nav ul {
        justify-content: flex-start;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    nav a {
        padding: 12px 15px;
        font-size: 0.85rem;
        white-space: nowrap;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    table {
        font-size: 0.85rem;
    }

    th, td {
        padding: 10px;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .intro-section {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.7rem;
    }

    header .tagline {
        font-size: 1rem;
    }

    main {
        padding: 20px 15px;
    }

    section {
        margin-bottom: 40px;
    }

    .tip-box, .warning-box, .product-callout {
        padding: 15px;
    }

    .tool-card {
        padding: 20px;
    }
}

/* Print Styles */
@media print {
    nav, .btn {
        display: none;
    }

    header {
        background: none;
        color: var(--text-color);
        padding: 20px 0;
    }

    section {
        page-break-inside: avoid;
    }

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

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8rem;
    }
}