/* ===== CSS Variables ===== */
:root {
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #e67e22;
    --color-accent-hover: #d35400;
    --color-light: #ecf0f1;
    --color-dark: #1a252f;
    --color-text: #333;
    --color-text-light: #666;
    --color-white: #fff;
    --color-border: #ddd;

    /* Grit colors */
    --grit-coarse: #e74c3c;
    --grit-medium: #f39c12;
    --grit-fine: #3498db;
    --grit-ultra: #9b59b6;

    --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-white);
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    color: var(--color-primary);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Navigation ===== */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: var(--color-white);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 2rem 4rem;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--color-white);
    margin-bottom: 1.5rem;
    max-width: 800px;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.9);
    max-width: 600px;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--color-accent);
    color: var(--color-white);
    font-weight: 600;
    font-size: 1.1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    background: var(--color-accent-hover);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== Sections ===== */
.section {
    padding: 5rem 0;
}

.section h2 {
    font-size: 2.25rem;
    text-align: center;
    margin-bottom: 1rem;
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    color: var(--color-text-light);
    font-size: 1.1rem;
}

/* ===== Introduction Section ===== */
.intro-section {
    background: var(--color-light);
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.intro-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

.intro-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.intro-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.intro-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.intro-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== Grit Section ===== */
.grit-table-wrapper {
    overflow-x: auto;
    margin-bottom: 3rem;
}

.grit-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.grit-table th,
.grit-table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.grit-table th {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
}

.grit-table tr:last-child td {
    border-bottom: none;
}

.grit-table tr:hover {
    background: var(--color-light);
}

.grit-coarse td:first-child { border-left: 4px solid var(--grit-coarse); }
.grit-medium td:first-child { border-left: 4px solid var(--grit-medium); }
.grit-fine td:first-child { border-left: 4px solid var(--grit-fine); }
.grit-ultra td:first-child { border-left: 4px solid var(--grit-ultra); }

.grit-recommendation {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    margin-bottom: 3rem;
}

.grit-recommendation h3 {
    color: var(--color-white);
    margin-bottom: 1rem;
}

.grit-recommendation p {
    margin-bottom: 1rem;
    opacity: 0.95;
}

.product-link {
    color: var(--color-accent);
    font-weight: 500;
}

.product-link:hover {
    color: #f39c12;
}

.grit-progression h3 {
    text-align: center;
    margin-bottom: 2rem;
}

.progression-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.progression-card {
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.progression-card h4 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.progression-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.grit-step {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--color-white);
    font-weight: 600;
}

.grit-step.coarse { background: var(--grit-coarse); }
.grit-step.medium { background: var(--grit-medium); }
.grit-step.fine { background: var(--grit-fine); }
.grit-step.ultra { background: var(--grit-ultra); }

.arrow {
    color: var(--color-text-light);
    font-weight: bold;
}

.progression-card p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ===== Technique Section ===== */
.technique-section {
    background: var(--color-light);
}

.technique-steps {
    max-width: 800px;
    margin: 0 auto 3rem;
}

.step {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

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

.step-content h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.step-content p {
    margin-bottom: 0.75rem;
    color: var(--color-text-light);
}

.tip {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.stroke-tips {
    margin-top: 1rem;
    padding-left: 1.25rem;
}

.stroke-tips li {
    list-style: disc;
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

.common-mistakes h3 {
    text-align: center;
    margin-bottom: 2rem;
}

.mistakes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.mistake-card {
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--grit-coarse);
    box-shadow: var(--shadow-sm);
}

.mistake-card h4 {
    color: var(--grit-coarse);
    margin-bottom: 0.5rem;
}

.mistake-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== Angles Section ===== */
.angles-chart {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.angle-card {
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.angle-visual {
    margin-bottom: 1rem;
}

.angle-display {
    display: inline-block;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: var(--radius-md);
}

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

.angle-card > p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.angle-card ul {
    text-align: left;
    padding-left: 1.25rem;
}

.angle-card li {
    list-style: disc;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.angle-tips {
    background: var(--color-light);
    padding: 2rem;
    border-radius: var(--radius-md);
}

.angle-tips h3 {
    margin-bottom: 1rem;
}

.angle-tips p {
    color: var(--color-text-light);
}

/* ===== Maintenance Section ===== */
.maintenance-section {
    background: var(--color-light);
}

.maintenance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.maintenance-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.maintenance-card h3 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.maintenance-card h4 {
    margin: 1rem 0 0.5rem;
    font-size: 1rem;
    color: var(--color-secondary);
}

.maintenance-card p {
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.maintenance-card ul {
    padding-left: 1.25rem;
    margin-bottom: 1rem;
}

.maintenance-card li {
    list-style: disc;
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* ===== Types Section ===== */
.types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.type-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.type-card h3 {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--color-light);
}

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

.pros h4 {
    color: #27ae60;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.cons h4 {
    color: var(--grit-coarse);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.type-pros-cons ul {
    padding-left: 1rem;
}

.type-pros-cons li {
    list-style: disc;
    font-size: 0.85rem;
    margin-bottom: 0.35rem;
    color: var(--color-text-light);
}

.type-best {
    background: var(--color-light);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text);
}

/* ===== Recommendations Section ===== */
.recommendations-section {
    background: var(--color-light);
}

.recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.recommendation-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    position: relative;
    display: flex;
    flex-direction: column;
}

.recommendation-card.featured {
    border: 2px solid var(--color-accent);
}

.rec-badge {
    position: absolute;
    top: -12px;
    left: 1.5rem;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.recommendation-card h3 {
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
}

.rec-grits {
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 1rem;
}

.recommendation-card > p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.rec-features {
    padding-left: 1.25rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.rec-features li {
    list-style: disc;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.rec-button {
    display: block;
    text-align: center;
    padding: 0.875rem 1.5rem;
    background: var(--color-accent);
    color: var(--color-white);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.rec-button:hover {
    background: var(--color-accent-hover);
    color: var(--color-white);
    transform: translateY(-2px);
}

.accessories-section h3 {
    text-align: center;
    margin-bottom: 2rem;
}

.accessories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.accessory-card {
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.accessory-card h4 {
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.accessory-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.accessory-link {
    font-weight: 500;
}

/* ===== FAQ Section ===== */
.faq-section {
    background: var(--color-white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-question {
    width: 100%;
    padding: 1.25rem 0;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-primary);
    font-family: inherit;
}

.faq-question:hover {
    color: var(--color-accent);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-bottom: 1.25rem;
}

.faq-answer p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===== Footer ===== */
.footer {
    background: var(--color-dark);
    color: rgba(255,255,255,0.8);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    font-size: 0.95rem;
}

.footer-links h4 {
    color: var(--color-white);
    margin-bottom: 1rem;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    text-align: center;
}

.affiliate-disclosure {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 0.75rem;
}

.copyright {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-primary);
        flex-direction: column;
        padding: 1rem 2rem 2rem;
        gap: 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition);
    }

    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-menu li {
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-menu a {
        display: block;
        padding: 1rem 0;
    }

    .section {
        padding: 3rem 0;
    }

    .step {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }

    .stroke-tips {
        text-align: left;
    }

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

    .grit-table th,
    .grit-table td {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section h2 {
        font-size: 1.75rem;
    }

    .progression-flow {
        flex-direction: column;
    }

    .arrow {
        transform: rotate(90deg);
    }
}