/* ========================================
   Valentinapp - Google SERP Checker
   Modern Responsive Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #06b6d4;
    --accent: #8b5cf6;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

ul {
    list-style: none;
}

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

/* ========================================
   Header & Navigation
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--gray);
    font-weight: 500;
    font-size: 0.95rem;
}

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

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    box-shadow: var(--shadow);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--dark);
    border: 2px solid var(--light);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

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

.hero {
    padding: 160px 0 100px;
    background: linear-gradient(180deg, var(--light) 0%, var(--white) 100%);
    text-align: center;
}

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

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--dark), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    font-weight: 500;
}

/* ========================================
   Section Styles
   ======================================== */

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--dark);
}

.section-subtitle {
    text-align: center;
    color: var(--gray);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 60px;
}

/* ========================================
   Introduction Section
   ======================================== */

.introduction {
    background: var(--white);
}

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

.section-content h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--dark);
}

.section-content p {
    margin-bottom: 20px;
    color: var(--gray);
    line-height: 1.8;
}

.text-link {
    color: var(--primary);
    font-weight: 600;
    border-bottom: 2px solid transparent;
}

.text-link:hover {
    border-bottom-color: var(--primary);
}

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

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* ========================================
   Demo Section
   ======================================== */

.demo {
    background: var(--white);
}

.demo-box {
    max-width: 600px;
    margin: 0 auto;
    background: var(--light);
    padding: 40px;
    border-radius: var(--radius-xl);
    border: 2px solid rgba(99, 102, 241, 0.1);
}

.demo-input-group {
    margin-bottom: 24px;
}

.demo-input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--dark);
    font-size: 0.9rem;
}

.demo-input,
.demo-select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--white);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    background: var(--white);
    color: var(--dark);
    transition: var(--transition);
}

.demo-input:focus,
.demo-select:focus {
    outline: none;
    border-color: var(--primary);
}

.demo-results {
    margin-top: 30px;
    padding: 24px;
    background: var(--white);
    border-radius: var(--radius);
}

.demo-results.hidden {
    display: none;
}

.demo-results h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--dark);
}

.result-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--light);
}

.result-item:last-child {
    border-bottom: none;
}

.result-rank {
    width: 36px;
    height: 36px;
    background: var(--light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--dark);
}

.result-item.highlight .result-rank {
    background: var(--primary);
    color: var(--white);
}

.result-url {
    flex: 1;
    font-size: 0.9rem;
    color: var(--gray);
    font-family: monospace;
}

.result-badge {
    background: var(--success);
    color: var(--white);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.demo-note {
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--gray-light);
    text-align: center;
}

/* ========================================
   Benefits Section
   ======================================== */

.benefits {
    background: var(--light);
}

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

.benefit-item {
    margin-bottom: 40px;
    padding: 30px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.benefit-item:last-child {
    margin-bottom: 0;
}

.benefit-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}

.benefit-item p {
    color: var(--gray);
    line-height: 1.7;
}

/* ========================================
   Use Cases Section
   ======================================== */

.use-cases {
    background: var(--white);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.use-case-card {
    padding: 30px;
    background: var(--light);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.use-case-card:hover {
    background: var(--white);
    box-shadow: var(--shadow-lg);
}

.use-case-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}

.use-case-card p {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   Guide Section
   ======================================== */

.guide {
    background: var(--light);
}

.steps {
    max-width: 700px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 24px;
    margin-bottom: 40px;
}

.step:last-child {
    margin-bottom: 0;
}

.step-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--dark);
}

.step-content p {
    color: var(--gray);
    line-height: 1.7;
}

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

.cta {
    background: var(--white);
    padding: 80px 0;
}

.cta-box {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: 60px 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-xl);
    color: var(--white);
}

.cta-box h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-box p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

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

.cta-box .btn-primary:hover {
    background: var(--light);
}

.cta-note {
    margin-top: 20px;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ========================================
   FAQ Section
   ======================================== */

.faq {
    background: var(--light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 16px;
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 24px 30px;
    background: var(--white);
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--light);
}

.faq-icon {
    width: 20px;
    height: 20px;
    color: var(--gray);
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 30px 24px;
    color: var(--gray);
    line-height: 1.7;
}

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

.footer {
    background: var(--dark);
    color: var(--white);
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    margin-bottom: 20px;
    color: var(--white);
}

.footer-brand p {
    color: var(--gray-light);
    line-height: 1.7;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    color: var(--gray-light);
    font-size: 0.95rem;
}

.footer-column ul li a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    border-top: 1px solid var(--dark-light);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    color: var(--gray);
    font-size: 0.9rem;
}

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

@media (max-width: 1024px) {
    .features-grid,
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .step {
        flex-direction: column;
        gap: 16px;
    }
    
    .demo-box {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .cta-box {
        padding: 40px 24px;
    }
    
    .cta-box h2 {
        font-size: 1.5rem;
    }
}

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

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}