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

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
    text-align: center;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
}

/* ===========================
   Layout & Containers
   =========================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

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

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

.nav-brand h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--primary-color);
}

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

.nav-link {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* ===========================
   Hero Section
   =========================== */

.hero {
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    padding: var(--spacing-2xl) 0;
}

.hero-content {
    text-align: center;
}

.hero-headline {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.hero-kicker {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.hero-subheadline {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

.hero-note {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: var(--spacing-md);
}

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

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ===========================
   Problem Section
   =========================== */

.problem {
    background-color: var(--bg-light);
}

.problem h3 {
    margin-bottom: var(--spacing-xl);
}

.problem-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.problem-item {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.problem-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.problem-item p {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-dark);
}

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

.solution {
    background-color: var(--bg-white);
}

.solution-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.solution-header h3 {
    margin-bottom: var(--spacing-md);
}

.solution-header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.solution-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.solution-card {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    text-align: center;
}

.solution-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.solution-card h4 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.solution-card p {
    margin: 0;
    font-size: 0.95rem;
}

/* ===========================
   Features Section
   =========================== */

.features {
    background-color: var(--bg-light);
}

.features h3 {
    margin-bottom: var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    border-top: 3px solid var(--primary-color);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.feature-card h4 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    margin: 0;
    font-size: 0.95rem;
}

/* ===========================
   Pricing Section
   =========================== */

.pricing {
    background-color: var(--bg-white);
}

.pricing h3 {
    margin-bottom: var(--spacing-xl);
}

.pricing-card {
    background-color: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: 0.5rem;
    border: 2px solid var(--primary-color);
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
}

.pricing-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.pricing-period {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
}

.pricing-features {
    list-style: none;
    text-align: left;
}

.pricing-features li {
    padding: 0.5rem 0;
    color: var(--text-dark);
    font-weight: 500;
}

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

.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-align: center;
}

.cta-section h3 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

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

.cta-section .btn-primary:hover {
    background-color: var(--bg-light);
}

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

.footer {
    background-color: #111827;
    color: #e5e7eb;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    margin: 0;
    font-size: 0.95rem;
}

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

.footer-section ul li {
    padding: 0.5rem 0;
}

.footer-section a {
    color: #e5e7eb;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid #374151;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin: 0;
}

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

/* Tablet (768px and up) */
@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }

    .hero-headline {
        font-size: 3rem;
    }

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

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

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

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    .hero-headline {
        font-size: 3.5rem;
    }

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

    .solution-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Small screens (mobile optimization) */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }

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

    .nav-links {
        gap: var(--spacing-md);
        font-size: 0.85rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .hero-headline {
        font-size: 1.75rem;
    }

    .btn {
        width: 100%;
    }
}

/* ===========================
   Utility Classes
   =========================== */

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}