/* ============================================
   Syntharil Landing Page - Basecamp-inspired
   Clean, warm, conversational design
   ============================================ */

/* CSS Variables - Basecamp-inspired */
:root {
    /* Colors - soft, readable palette */
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f4;
    --color-text: #1c1917;
    --color-text-secondary: #57534e;
    --color-text-muted: #a8a29e;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-border: #e7e5e4;
    --color-quote-bg: #ffffff;

    /* Typography */
    --font-family-graphik: 'Graphik', Sans-Serif;
    --font-sans: var(--font-family-graphik), -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Font sizes */
    --font-size-x-large: clamp(2rem, 5vw, 3rem);

    /* Letter spacing */
    --letter-spacing-x-tight: -0.03em;

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

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Layout */
    --max-width: 1200px;
    --max-width-narrow: 800px;
}

/* Dark mode - follows system preference */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #111113;
        --color-bg-alt: #1c1c1f;
        --color-text: #ececec;
        --color-text-secondary: #a1a1aa;
        --color-text-muted: #71717a;
        --color-accent: #3b82f6;
        --color-accent-hover: #60a5fa;
        --color-border: #2a2a2e;
        --color-quote-bg: #1c1c1f;
    }
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color-scheme: light dark;
}

body {
    font-family: var(--font-sans);
    font-size: 18px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    font-weight: 400;
    letter-spacing: -0.011em;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.15;
    color: var(--color-text);
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
}

h2 {
    font-size: var(--font-size-x-large);
    font-weight: 700;
    letter-spacing: var(--letter-spacing-x-tight);
    line-height: 1.15;
    margin-bottom: -0.175em;
    margin-top: -0.4375em;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

p {
    color: var(--color-text-secondary);
    letter-spacing: -0.011em;
}

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

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

/* ============================================
   Layout
   ============================================ */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    padding: var(--spacing-md) 0;
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

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

/* ============================================
   Buttons
   ============================================ */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

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

.button-primary:hover {
    background: var(--color-accent-hover);
    color: white;
    transform: translateY(-1px);
}

.button-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    padding: 0.625rem 1.25rem;
    background: var(--color-accent);
    color: white;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.2s ease;
}

.cta-button:hover {
    background: var(--color-accent-hover);
    color: white;
}

/* ============================================
   Hero Section - Problem State
   ============================================ */

.hero {
    padding: 0 0 var(--spacing-2xl);
    background: var(--color-bg);
}

/* Full-width hero image - comes first */
.hero-image-full {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto var(--spacing-2xl);
}

.hero-image-full img {
    width: 100%;
    height: auto;
    display: block;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.375rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    max-width: 650px;
    margin: 0 auto;
}

/* ============================================
   Solution Section
   ============================================ */

.section-solution {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg);
    text-align: center;
}

.solution-header {
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
}

.solution-eyebrow {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.solution-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    margin-bottom: var(--spacing-md);
}

.solution-subtitle {
    font-size: 1.375rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
}

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

.solution-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* Full-width solution image */
.solution-image-full {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.solution-image-full img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

/* ============================================
   Sections
   ============================================ */

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

.section-alt {
    background-color: var(--color-bg-alt);
}

.section-header-centered {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.section-header-centered h2 {
    margin-bottom: var(--spacing-md);
}

.section-header-centered p {
    font-size: 1.25rem;
    line-height: 1.5;
}

/* ============================================
   How It Works
   ============================================ */

.how-it-works-layout {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
}

.how-it-works-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.step {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.125rem;
}

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

.step-content p {
    margin: 0;
}

/* ============================================
   Features Grid
   ============================================ */

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

.feature-card {
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-card p {
    margin: 0;
    line-height: 1.6;
}

/* Feature Showcase with Large Image */
.feature-showcase {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.feature-showcase-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-showcase-content p {
    font-size: 1.125rem;
    line-height: 1.6;
    margin: 0;
}

.feature-showcase-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

/* ============================================
   Use Cases Grid
   ============================================ */

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    max-width: var(--max-width);
    margin: 0 auto;
}

.use-case-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    text-align: center;
}

.use-case-card h3 {
    margin-bottom: var(--spacing-sm);
}

.use-case-card p {
    margin: 0;
}

/* ============================================
   CTA Section
   ============================================ */

.section-cta {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
    text-align: center;
    color: white;
    padding: var(--spacing-3xl) var(--spacing-md);
}

.section-cta h2 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.section-cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    line-height: 1.5;
    margin-bottom: var(--spacing-lg);
}

.section-cta .button-primary {
    background: white;
    color: var(--color-accent);
}

.section-cta .button-primary:hover {
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-accent-hover);
}

.cta-note {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: var(--spacing-md);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-bg-alt);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand p {
    margin-top: var(--spacing-sm);
    font-size: 0.9375rem;
}

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

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

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

@media (max-width: 1024px) {
    .how-it-works-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .how-it-works-image {
        order: -1;
        max-width: 600px;
        margin: 0 auto;
    }

    .feature-showcase {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .feature-showcase-image {
        order: -1;
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-pain-points {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .solution-subtitle {
        font-size: 1.125rem;
    }

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

    .use-cases-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

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

    .nav-links {
        display: none;
    }

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

@media (max-width: 480px) {
    body {
        font-size: 17px;
    }

    .nav-actions {
        gap: var(--spacing-sm);
    }

    .nav-actions .nav-link {
        display: none;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .button-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* ============================================
   Accessibility
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: white;
    padding: 8px;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Dark Mode Overrides
   (for elements with hardcoded colors)
   ============================================ */

@media (prefers-color-scheme: dark) {
    img {
        border-radius: var(--radius-lg);
    }

    .hero-image-full img {
        border-radius: 0;
    }

    .section-cta {
        background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 100%);
    }

    .section-cta .button-primary {
        background: white;
        color: #1d4ed8;
    }

    .section-cta .button-primary:hover {
        background: #ececec;
        color: #1e40af;
    }
}