/* ============================================
   Patternism — patternism.net
   ============================================ */

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent: #4a6cf7;
    --color-accent-hover: #3b5de7;
    --color-border: #e5e5e5;
    --color-muted-bg: #f3f4f6;
    --radius: 12px;
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.btn-nav {
    background: var(--color-text);
    color: var(--color-bg) !important;
    padding: 0.4rem 1rem;
    border-radius: 8px;
    font-weight: 600 !important;
    transition: opacity 0.15s;
}

.btn-nav:hover {
    opacity: 0.85;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.15s;
    border: none;
    cursor: pointer;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: var(--color-text);
    color: var(--color-bg);
}

.btn-primary:hover {
    opacity: 0.85;
}

.btn-secondary {
    background: var(--color-muted-bg);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 14px;
}

/* Hero */
.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem 2rem 4rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}

.hero-sub {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
}

/* Features Grid */
.features {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 5rem 2rem;
}

.features-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.feature {
    padding: 1.5rem;
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.feature h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.feature p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Showcase */
.showcase {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem 2rem;
}

.showcase-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 5rem;
}

.showcase-item:last-child {
    margin-bottom: 0;
}

.showcase-item.reverse {
    direction: rtl;
}

.showcase-item.reverse > * {
    direction: ltr;
}

.showcase-text h2 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.showcase-text p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

/* CTA */
.cta {
    text-align: center;
    padding: 5rem 2rem;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.cta h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.cta p {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
    margin-bottom: 2rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-inner p {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.15s;
}

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

/* Placeholder Images */
.placeholder-image {
    width: 100%;
    min-height: 300px;
    background: var(--color-muted-bg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    font-style: italic;
    text-align: center;
    padding: 2rem;
}

.placeholder-image::after {
    content: attr(data-label);
}

/* ============================================
   Instructions Page
   ============================================ */

.instructions {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 2rem 5rem;
}

.instructions h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
}

.instructions-intro {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 3rem;
}

.instruction-section {
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--color-border);
}

.instruction-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.instruction-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
}

.instruction-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.instruction-section p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.instruction-section ul,
.instruction-section ol {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.instruction-section li {
    margin-bottom: 0.35rem;
}

.instruction-section .placeholder-image {
    margin: 1.5rem 0;
    min-height: 250px;
}

.screenshot {
    display: block;
    margin: 2rem auto;
    border-radius: var(--radius);
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.tips-list {
    list-style: none;
    margin-left: 0 !important;
}

.tips-list li {
    padding: 0.75rem 1rem;
    background: var(--color-muted-bg);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 3rem 1.5rem;
        gap: 2.5rem;
        text-align: center;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-sub {
        max-width: none;
    }

    .hero-actions {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .showcase-item,
    .showcase-item.reverse {
        grid-template-columns: 1fr;
        gap: 2rem;
        direction: ltr;
    }

    .footer-inner {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    .instructions {
        padding: 2rem 1.5rem 4rem;
    }

    .instructions h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .btn-large {
        padding: 0.85rem 1.5rem;
        font-size: 1rem;
    }
}