/* ============================================
   SEARCHA Premium Design System
   Stripe/Linear-inspired aesthetic
   ============================================ */

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

:root {
    /* Professional Colors */
    --pro-bg-start: #0a0e27;
    --pro-bg-end: #1a1f3a;
    --pro-accent: #6366f1;
    --pro-accent-light: #818cf8;
    --pro-text: #e2e8f0;
    --pro-text-dim: #94a3b8;
    
    /* Casual Colors */
    --casual-bg-start: #f0f9ff;
    --casual-bg-end: #e0f2fe;
    --casual-accent: #0ea5e9;
    --casual-accent-light: #38bdf8;
    --casual-text: #0f172a;
    --casual-text-dim: #475569;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Gradient Backgrounds */
.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: linear-gradient(135deg, var(--pro-bg-start) 0%, var(--pro-bg-end) 100%);
}

.gradient-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
}

.gradient-bg-casual {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: linear-gradient(135deg, var(--casual-bg-start) 0%, var(--casual-bg-end) 100%);
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

body.professional {
    color: var(--pro-text);
}

body.casual {
    color: var(--casual-text);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav {
    padding: 24px 0;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.casual .nav {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

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

.logo-premium {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--pro-accent) 0%, var(--pro-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-premium.casual {
    background: linear-gradient(135deg, var(--casual-accent) 0%, var(--casual-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link-premium {
    color: var(--pro-text-dim);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.casual .nav-link-premium {
    color: var(--casual-text-dim);
}

.nav-link-premium:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--pro-accent-light);
}

body.casual .nav-link-premium:hover {
    background: rgba(14, 165, 233, 0.1);
    color: var(--casual-accent);
}

/* Hero Section */
.hero-premium {
    padding: 120px 0 80px 0;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--pro-accent-light);
    margin-bottom: 24px;
    letter-spacing: 0.5px;
}

.badge.casual {
    background: rgba(14, 165, 233, 0.1);
    border-color: rgba(14, 165, 233, 0.2);
    color: var(--casual-accent);
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--pro-accent) 0%, var(--pro-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text.casual {
    background: linear-gradient(135deg, var(--casual-accent) 0%, var(--casual-accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    color: var(--pro-text-dim);
    max-width: 800px;
    margin: 0 auto 48px auto;
}

body.casual .hero-subtitle {
    color: var(--casual-text-dim);
}

/* Buttons */
.cta-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.btn-premium {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn-premium.primary {
    background: linear-gradient(135deg, var(--pro-accent) 0%, var(--pro-accent-light) 100%);
    color: white;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3), 0 2px 8px rgba(99, 102, 241, 0.2);
}

.btn-premium.primary.casual {
    background: linear-gradient(135deg, var(--casual-accent) 0%, var(--casual-accent-light) 100%);
    box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3), 0 2px 8px rgba(14, 165, 233, 0.2);
}

.btn-premium.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.4), 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-premium.primary.casual:hover {
    box-shadow: 0 12px 32px rgba(14, 165, 233, 0.4), 0 4px 12px rgba(14, 165, 233, 0.3);
}

.btn-premium.large {
    padding: 20px 48px;
    font-size: 18px;
}

.cta-subtext {
    font-size: 14px;
    color: var(--pro-text-dim);
}

body.casual .cta-subtext {
    color: var(--casual-text-dim);
}

/* Features Section */
.features-premium {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.section-header p {
    font-size: 18px;
    color: var(--pro-text-dim);
    max-width: 700px;
    margin: 0 auto;
}

body.casual .section-header p {
    color: var(--casual-text-dim);
}

.feature-grid-premium {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card-premium {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.casual .feature-card-premium {
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(0, 0, 0, 0.05);
}

.feature-card-premium:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border-color: rgba(99, 102, 241, 0.3);
}

body.casual .feature-card-premium:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: rgba(14, 165, 233, 0.3);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 12px;
    margin-bottom: 16px;
    color: var(--pro-accent-light);
}

body.casual .feature-icon {
    background: rgba(14, 165, 233, 0.1);
    color: var(--casual-accent);
}

.feature-card-premium h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card-premium p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--pro-text-dim);
}

body.casual .feature-card-premium p {
    color: var(--casual-text-dim);
}

/* Use Cases Section */
.use-cases-premium {
    padding: 80px 0;
}

.use-cases-content {
    max-width: 800px;
    margin: 0 auto;
}

.use-cases-content h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    letter-spacing: -1px;
}

.use-case-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.use-case-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.casual .use-case-item {
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(0, 0, 0, 0.05);
}

.use-case-item:hover {
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateX(4px);
}

body.casual .use-case-item:hover {
    border-color: rgba(14, 165, 233, 0.3);
}

.use-case-item svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--pro-accent-light);
}

body.casual .use-case-item svg {
    color: var(--casual-accent);
}

.use-case-item span {
    font-size: 16px;
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    padding: 80px 0;
}

.steps-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.step-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    padding: 32px;
    position: relative;
}

.step-card.highlight {
    background: rgba(14, 165, 233, 0.1);
    border-color: rgba(14, 165, 233, 0.2);
}

.step-number {
    position: absolute;
    top: 32px;
    right: 32px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--casual-accent);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 18px;
}

.step-content h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--casual-text);
}

.example-bubble {
    padding: 12px 16px;
    border-radius: 12px;
    margin: 12px 0;
    font-size: 15px;
    line-height: 1.5;
}

.example-bubble.user {
    background: rgba(14, 165, 233, 0.1);
    border-left: 3px solid var(--casual-accent);
    font-style: italic;
}

.example-bubble.searcha {
    background: rgba(99, 102, 241, 0.1);
    color: var(--casual-text);
    font-weight: 500;
}

.step-result {
    font-size: 14px;
    margin-top: 12px;
}

.step-result.bad {
    color: #ef4444;
}

.output-preview {
    background: rgba(0, 0, 0, 0.05);
    padding: 16px;
    border-radius: 8px;
    margin: 12px 0;
}

.output-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--casual-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.output-preview code {
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    color: var(--casual-text);
    display: block;
}

.output-note {
    font-size: 13px;
    color: var(--casual-text-dim);
    font-style: italic;
    margin-top: 8px;
}

.step-arrow {
    text-align: center;
    font-size: 32px;
    color: var(--casual-accent);
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    padding: 80px 0;
}

.benefit-card-premium {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.benefit-card-premium:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: rgba(14, 165, 233, 0.3);
}

.benefit-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.benefit-card-premium h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--casual-text);
}

.benefit-card-premium p {
    font-size: 15px;
    line-height: 1.6;
    color: var(--casual-text-dim);
}

/* Final CTA */
.final-cta-premium {
    padding: 80px 0;
}

.final-cta-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    padding: 64px 48px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.final-cta-card.casual {
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(0, 0, 0, 0.05);
}

.final-cta-card h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 32px;
    line-height: 1.2;
    letter-spacing: -1px;
}

/* Footer */
.footer-premium {
    padding: 48px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 80px;
}

body.casual .footer-premium {
    border-top-color: rgba(0, 0, 0, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--pro-text-dim);
}

body.casual .footer-content {
    color: var(--casual-text-dim);
}

.footer-content a {
    color: var(--pro-accent-light);
    text-decoration: none;
    transition: color 0.3s;
}

body.casual .footer-content a {
    color: var(--casual-accent);
}

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

body.casual .footer-content a:hover {
    color: var(--casual-accent-light);
}

.footer-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 40px;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .feature-grid-premium {
        grid-template-columns: 1fr;
    }
    
    .final-cta-card h2 {
        font-size: 32px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
    }
}