/* Model Optimizer Marketing Site Styles */

/* CSS Variables */
:root {
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-secondary: #8B5CF6;
    --color-text: #1F2937;
    --color-text-muted: #6B7280;
    --color-text-light: #9CA3AF;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-bg-dark: #111827;
    --color-border: #E5E7EB;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p { margin-bottom: var(--spacing-4); }

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    line-height: 1.5;
    text-decoration: none;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

a.btn-primary,
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    border-color: transparent;
}

a.btn-primary:hover,
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

a.btn-outline,
.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

a.btn-outline:hover,
.btn-outline:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

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

a.btn-white:hover,
.btn-white:hover {
    background: var(--color-bg-alt);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-4) var(--spacing-6);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
}

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

.nav-logo-icon {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.nav-links a:not(.btn) {
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:not(.btn):hover {
    color: var(--color-text);
}

.nav-link-login {
    color: var(--color-text) !important;
}

.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-2);
}

.nav-mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

.nav-mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.nav-mobile {
    display: none;
    position: fixed;
    top: 65px;
    left: 0;
    right: 0;
    background: white;
    padding: var(--spacing-6);
    flex-direction: column;
    gap: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
}

.nav-mobile.active {
    display: flex;
}

.nav-mobile a:not(.btn) {
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-3) 0;
}

/* Hero Section */
.hero {
    position: relative;
    padding: var(--spacing-24) 0 var(--spacing-20);
    margin-top: 65px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #EEF2FF 0%, #F5F3FF 50%, #FDF2F8 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 70%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-2) var(--spacing-4);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-6);
}

.hero h1 {
    font-size: var(--font-size-6xl);
    margin-bottom: var(--spacing-6);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-8);
    max-width: 500px;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: flex-start;
}

.hero-cta-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: flex-end;
}

.hero-card {
    width: 100%;
    max-width: 420px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.hero-card-header {
    display: flex;
    gap: var(--spacing-2);
    padding: var(--spacing-4);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
}

.hero-card-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-border);
}

.hero-card-dot:nth-child(1) { background: #EF4444; }
.hero-card-dot:nth-child(2) { background: #F59E0B; }
.hero-card-dot:nth-child(3) { background: #10B981; }

.hero-card-content {
    padding: var(--spacing-6);
}

.hero-stat {
    margin-bottom: var(--spacing-6);
}

.hero-stat-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-1);
}

.hero-stat-value {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text);
}

.hero-stat-change {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.hero-stat-change.negative {
    color: var(--color-error);
}

.hero-insight {
    display: flex;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(16, 185, 129, 0.04) 100%);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.hero-insight-icon {
    font-size: var(--font-size-2xl);
}

.hero-insight-content strong {
    display: block;
    color: var(--color-success);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-1);
}

.hero-insight-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.hero-insight-content .highlight {
    color: var(--color-success);
    font-weight: 600;
}

/* Section Headers */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-12);
}

.section-header h2 {
    margin-bottom: var(--spacing-4);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin-bottom: 0;
}

.section-header em {
    font-style: italic;
}

/* Problem Section */
.problem {
    padding: var(--spacing-20) 0;
    background: var(--color-bg);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-6);
}

.problem-card {
    padding: var(--spacing-6);
    background: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-4);
}

.problem-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
}

.problem-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* Features Section */
.features {
    padding: var(--spacing-20) 0;
    background: var(--color-bg-alt);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-6);
}

.feature-card {
    padding: var(--spacing-8);
    background: white;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card-primary {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    border: none;
}

.feature-card-primary h3 {
    color: white;
}

.feature-card-primary .feature-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-4);
    color: var(--color-primary);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
}

.feature-card p {
    color: var(--color-text-muted);
    margin: 0;
}

.feature-card.feature-card-primary > p {
    color: white;
    font-size: var(--font-size-lg);
    margin-bottom: 0;
}

.feature-example {
    margin-top: var(--spacing-6);
    padding: var(--spacing-5);
    background: white;
    border-radius: var(--radius-lg);
    color: var(--color-text);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.feature-example-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-3);
    border-bottom: 1px solid var(--color-border);
}

.feature-example-header svg {
    width: 20px;
    height: 20px;
    color: var(--color-warning);
}

.feature-example-header span {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.feature-example-pattern {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-3);
}

.feature-example-pattern strong {
    color: var(--color-text);
}

.feature-example-recommendation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-4);
    padding: var(--spacing-3) var(--spacing-4);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-success);
}

.feature-example-recommendation-text {
    font-weight: 500;
    color: var(--color-text);
}

.feature-example-savings {
    font-weight: 700;
    color: var(--color-success);
    white-space: nowrap;
}

/* How It Works Section */
.how-it-works {
    padding: var(--spacing-20) 0;
    background: var(--color-bg);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-4);
    max-width: 900px;
    margin: 0 auto var(--spacing-12);
}

.step {
    flex: 1;
    text-align: center;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    border-radius: 50%;
}

.step-content h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2);
}

.step-content p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--color-border);
    margin-top: 28px;
    flex-shrink: 0;
}

.how-it-works-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
    padding: var(--spacing-6);
    background: var(--color-bg-alt);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    max-width: 600px;
    margin: 0 auto;
}

.how-it-works-note svg {
    width: 32px;
    height: 32px;
    color: var(--color-success);
    flex-shrink: 0;
}

.how-it-works-note strong {
    display: block;
    margin-bottom: var(--spacing-1);
}

.how-it-works-note p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-20) 0;
    background: var(--color-bg-alt);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-6);
    max-width: 800px;
    margin: 0 auto;
}

.pricing-card {
    position: relative;
    padding: var(--spacing-8);
    background: white;
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    text-align: center;
}

.pricing-card-featured {
    border-color: var(--color-primary);
}

.pricing-card-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-1) var(--spacing-4);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-2xl);
}

.pricing-card-header {
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-6);
    border-bottom: 1px solid var(--color-border);
}

.pricing-card-header h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-4);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-1);
}

.pricing-amount {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-period {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-8);
    text-align: left;
}

.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    padding: var(--spacing-3) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.pricing-features svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
    margin-top: 1px;
}

.pricing-features strong {
    color: var(--color-text);
}

.pricing-card .btn {
    width: 100%;
}

.pricing-note {
    text-align: center;
    margin-top: var(--spacing-8);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.pricing-note p {
    margin: 0;
}

/* CTA Section */
.cta {
    padding: var(--spacing-20) 0;
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1E293B 100%);
    text-align: center;
}

.cta h2 {
    color: white;
    margin-bottom: var(--spacing-4);
}

.cta p {
    color: var(--color-text-light);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-8);
}

/* Footer */
.footer {
    padding: var(--spacing-16) 0 var(--spacing-8);
    background: var(--color-bg-dark);
    color: var(--color-text-light);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-12);
    padding-bottom: var(--spacing-12);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-4);
}

.footer-logo:hover {
    color: white;
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-16);
}

.footer-column h4 {
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-4);
}

.footer-column a {
    display: block;
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    padding: var(--spacing-2) 0;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-8);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero h1 {
        font-size: var(--font-size-5xl);
    }
    
    .hero-subtitle {
        max-width: none;
    }
    
    .hero-cta {
        align-items: center;
    }
    
    .hero-visual {
        justify-content: center;
    }
    
    .problem-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card-primary {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .nav-mobile-toggle {
        display: flex;
    }
    
    .hero {
        padding: var(--spacing-16) 0;
    }
    
    .hero h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .problem-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
        gap: var(--spacing-6);
    }
    
    .step-connector {
        display: none;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-8);
    }
    
    .footer-links {
        gap: var(--spacing-8);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .section-header h2 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-card {
        max-width: 100%;
    }
}