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

:root {
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #e74c3c;
    --color-accent-hover: #c0392b;
    --color-success: #27ae60;
    --color-warning: #f39c12;
    --color-light: #ecf0f1;
    --color-lighter: #f8f9fa;
    --color-text: #2c3e50;
    --color-text-light: #7f8c8d;
    --color-border: #ddd;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

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

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.3;
    margin-bottom: 0.5em;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--color-accent);
    display: inline-block;
}

h3 {
    font-size: 1.4rem;
    color: var(--color-secondary);
}

h4 {
    font-size: 1.1rem;
    color: var(--color-primary);
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}

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

ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero .tagline {
    font-size: 1.3rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* Navigation */
.main-nav {
    background: var(--color-light);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

.main-nav li {
    margin: 0;
}

.main-nav a {
    display: block;
    padding: 1rem 1.5rem;
    color: var(--color-primary);
    font-weight: 500;
    transition: all var(--transition);
}

.main-nav a:hover {
    background: var(--color-primary);
    color: white;
    text-decoration: none;
}

/* Content Sections */
.content-section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--color-border);
}

.content-section:last-of-type {
    border-bottom: none;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.benefit-card {
    background: var(--color-lighter);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
}

.benefit-card h3 {
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.benefit-card p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

/* Tip Box */
.tip-box, .info-box {
    background: linear-gradient(135deg, #fff9e6 0%, #fff3cd 100%);
    border: 1px solid #ffc107;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 2rem 0;
}

.tip-box h4, .info-box h4 {
    color: #856404;
    margin-bottom: 0.5rem;
}

.tip-box p, .info-box p {
    margin-bottom: 0;
    color: #856404;
}

/* Angle Comparison */
.angle-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.angle-card {
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition);
}

.angle-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.angle-visual {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent);
    text-align: center;
    margin-bottom: 0.5rem;
}

.angle-card h3 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.angle-card > p {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.angle-card ul {
    margin: 1rem 0 0 0;
    padding-left: 1.2rem;
}

.angle-card li {
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
}

/* Method Grid */
.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.method-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.method-card h3 {
    display: inline-block;
    margin-right: 1rem;
}

.skill-level {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    vertical-align: middle;
}

.skill-beginner {
    background: #d4edda;
    color: #155724;
}

.skill-intermediate {
    background: #fff3cd;
    color: #856404;
}

.skill-advanced {
    background: #f8d7da;
    color: #721c24;
}

.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

.pros h4 {
    color: var(--color-success);
}

.cons h4 {
    color: var(--color-accent);
}

.pros ul, .cons ul {
    margin: 0.5rem 0;
    padding-left: 1.2rem;
}

.pros li, .cons li {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.recommendation {
    background: var(--color-lighter);
    padding: 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Grit Table */
.grit-table {
    margin: 2rem 0;
}

.grit-row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.grit-row:last-child {
    border-bottom: none;
}

.grit-number {
    min-width: 120px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.grit-info strong {
    display: block;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.grit-info p {
    margin-bottom: 0;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Steps List */
.steps-list {
    margin: 2rem 0;
}

.step {
    display: flex;
    margin-bottom: 1.5rem;
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    margin-right: 1.5rem;
}

.step-content {
    flex: 1;
    padding-top: 0.5rem;
}

.step-content h4 {
    margin-bottom: 0.5rem;
}

.step-content p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

/* Product Callout */
.product-callout {
    background: linear-gradient(135deg, #e8f4fd 0%, #d1e9f6 100%);
    border: 1px solid #0d6efd;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 2rem 0;
}

.product-callout h4 {
    color: #0d6efd;
    margin-bottom: 0.5rem;
}

.product-callout p {
    margin-bottom: 0;
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.tip-card {
    background: var(--color-lighter);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border-top: 4px solid var(--color-primary);
}

.tip-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.tip-card p {
    margin-bottom: 0;
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* Frequency Guide */
.frequency-guide {
    margin: 2rem 0;
}

.frequency-guide table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.frequency-guide th,
.frequency-guide td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.frequency-guide th {
    background: var(--color-primary);
    color: white;
}

.frequency-guide tr:nth-child(even) {
    background: var(--color-lighter);
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.product-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-badge {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}

.product-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.product-features {
    margin: 1rem 0;
    padding-left: 1.2rem;
}

.product-features li {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.3rem;
}

.product-link {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition);
    text-decoration: none;
}

.product-link:hover {
    background: var(--color-accent-hover);
    color: white;
    text-decoration: none;
}

/* FAQ */
.faq-list {
    margin: 2rem 0;
}

.faq-item {
    background: var(--color-lighter);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.faq-item h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.faq-item p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

/* Footer */
footer {
    background: var(--color-primary);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.affiliate-disclosure {
    font-size: 0.85rem;
    opacity: 0.7;
    max-width: 600px;
    margin: 0 auto 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero .tagline {
        font-size: 1.1rem;
    }

    h2 {
        font-size: 1.6rem;
    }

    .main-nav a {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .content-section {
        padding: 3rem 0;
    }

    .angle-comparison,
    .method-grid,
    .products-grid {
        grid-template-columns: 1fr;
    }

    .pros-cons {
        grid-template-columns: 1fr;
    }

    .step {
        flex-direction: column;
    }

    .step-number {
        margin-bottom: 1rem;
    }

    .grit-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .grit-number {
        margin-bottom: 0.5rem;
    }

    .frequency-guide {
        overflow-x: auto;
    }

    .frequency-guide table {
        min-width: 500px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 3rem 0;
    }

    .main-nav ul {
        flex-direction: column;
    }

    .main-nav a {
        text-align: center;
        border-bottom: 1px solid var(--color-border);
    }

    .benefit-card,
    .angle-card,
    .method-card,
    .product-card,
    .tip-card,
    .faq-item {
        padding: 1rem;
    }
}

/* Print Styles */
@media print {
    .main-nav,
    .product-link {
        display: none;
    }

    .hero {
        background: none;
        color: black;
        padding: 1rem 0;
    }

    .content-section {
        padding: 1rem 0;
    }
}