/* ============================================
   reengage.email - Marketing Website Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #1a2b3c;
    --color-primary-light: #2d4356;
    --color-accent: #4a9d8c;
    --color-accent-light: #5fb3a2;
    --color-text: #374151;
    --color-text-light: #6b7280;
    --color-text-muted: #9ca3af;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-primary);
    line-height: 1.3;
    font-weight: 600;
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-accent-light);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 157, 140, 0.3);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: var(--font-size-lg);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.85;
}

.logo-icon {
    flex-shrink: 0;
    color: var(--color-accent);
}

.logo-icon-bg {
    fill: currentColor;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.nav-link {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-right: var(--spacing-md);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-cta {
    padding: 0.625rem 1.25rem;
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.nav-cta:hover {
    background-color: var(--color-primary-light);
    color: white;
}

/* Hero Section */
.hero {
    padding: calc(72px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    text-align: center;
    background: linear-gradient(180deg, var(--color-background-alt) 0%, var(--color-background) 100%);
}

.hero h1 {
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
}

.hero-subtitle {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.cta-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* Sections */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-intro {
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
}

.section h2 {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

/* Problem Section */
.problem {
    background-color: var(--color-background);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.problem-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.problem-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
    background-color: var(--color-background-alt);
    border-radius: 50%;
    color: var(--color-primary);
}

.problem-item h3 {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

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

/* Solution Section */
.solution {
    background-color: var(--color-background-alt);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.step {
    position: relative;
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin-bottom: var(--spacing-md);
    background-color: var(--color-accent);
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 600;
    border-radius: 50%;
}

.step h3 {
    margin-bottom: var(--spacing-xs);
}

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

/* Email Preview Section */
.preview {
    background-color: var(--color-background);
}

.email-sequence {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.email-card {
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.email-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.email-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.email-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: 100px;
}

.email-timing {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.email-card h3 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-accent);
}

.email-preview {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    font-style: italic;
    padding: var(--spacing-sm);
    background-color: var(--color-background-alt);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
}

.email-purpose {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin: 0;
}

.email-purpose strong {
    color: var(--color-text);
}

/* Audience Section */
.audience {
    background-color: var(--color-background-alt);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.audience-item {
    padding: var(--spacing-lg);
    background-color: var(--color-background);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.audience-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    background-color: var(--color-background-alt);
    border-radius: var(--border-radius-lg);
    color: var(--color-accent);
}

.audience-item h3 {
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}

.audience-item p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Simplicity Section */
.simplicity {
    background-color: var(--color-background);
}

.comparison {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto var(--spacing-xl);
}

.comparison-item {
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
}

.comparison-item.complex {
    background-color: var(--color-background-alt);
    border: 1px solid var(--color-border);
}

.comparison-item.simple {
    background-color: var(--color-primary);
    color: white;
}

.comparison-item h3 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.comparison-item.simple h3 {
    color: white;
}

.comparison-item ul {
    list-style: none;
}

.comparison-item li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.comparison-item.complex li::before {
    content: "×";
    position: absolute;
    left: 0;
    color: var(--color-text-muted);
    font-weight: 600;
}

.comparison-item.simple li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent-light);
    font-weight: 600;
}

.simplicity-tagline {
    text-align: center;
}

.simplicity-tagline p {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-background-alt);
    border-radius: var(--border-radius);
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-primary);
    margin: 0;
}

/* CTA Section */
.cta {
    background: linear-gradient(180deg, var(--color-background-alt) 0%, var(--color-background) 100%);
    text-align: center;
}

.cta h2 {
    font-size: var(--font-size-3xl);
}

.cta-box {
    max-width: 500px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.cta-reassurance {
    margin: var(--spacing-sm) 0 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.cta-box .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.whats-included {
    max-width: 400px;
    margin: var(--spacing-xl) auto 0;
    text-align: left;
}

.whats-included h3 {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.whats-included ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xs) var(--spacing-md);
}

.whats-included li {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    padding-left: 1.5rem;
    position: relative;
}

.whats-included li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 600;
}

.setup-link {
    margin-top: var(--spacing-lg);
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.setup-link a {
    color: var(--color-accent);
    text-decoration: underline;
}

/* Footer */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background-color: var(--color-primary);
    color: rgba(255, 255, 255, 0.7);
}

.footer-content {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    margin-bottom: var(--spacing-xs);
}

.footer-brand .logo-icon {
    color: var(--color-accent-light);
}

.footer-brand .logo-text {
    color: white;
}

.footer-tagline {
    font-size: var(--font-size-sm);
    margin: var(--spacing-xs) 0 0;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
}

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

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 2.25rem;
        --font-size-3xl: 1.75rem;
    }

    .audience-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --font-size-xl: 1.125rem;
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero {
        padding-top: calc(72px + var(--spacing-2xl));
    }

    .hero-subtitle {
        font-size: var(--font-size-lg);
    }

    .problem-grid,
    .steps-grid,
    .email-sequence {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

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

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .whats-included ul {
        grid-template-columns: 1fr;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.375rem;
    }

    .nav-container {
        height: 64px;
    }

    .hero {
        padding-top: calc(64px + var(--spacing-xl));
    }

    .btn {
        width: 100%;
    }

    .btn-large {
        padding: 1rem 2rem;
    }

    .section-intro {
        font-size: 1rem;
    }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}