/* ======================================
   YaxiChat Landing Page Styles
   ====================================== */

:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #3B82F6;
    --secondary: #0F172A;
    --accent: #10B981;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-dark: #0F172A;
    --border-color: #E2E8F0;
    --gradient-start: #2563EB;
    --gradient-end: #7C3AED;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.5rem; }

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ======================================
   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-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
}

.btn-ghost:hover {
    background: var(--bg-secondary);
}

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

.btn-white:hover {
    background: var(--bg-secondary);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
}

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

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo i {
    color: #25D366;
    font-size: 1.8rem;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    padding: 20px;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.mobile-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 12px 0;
}

.mobile-menu hr {
    border: none;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .nav-links, .nav-actions {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
}

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

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    border-radius: 50%;
    top: -200px;
    right: -200px;
    filter: blur(80px);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary);
    box-shadow: var(--shadow-md);
    margin-bottom: 24px;
}

.hero-badge i {
    color: var(--accent);
}

.hero h1 {
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.hero-stats .stat {
    display: flex;
    flex-direction: column;
}

.hero-stats .stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.hero-stats .stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Dashboard Preview */
.dashboard-preview {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.dashboard-preview:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--secondary);
    color: white;
    font-size: 0.875rem;
}

.preview-dots {
    display: flex;
    gap: 6px;
}

.preview-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #FF5F57;
}

.preview-dots span:nth-child(2) { background: #FEBC2E; }
.preview-dots span:nth-child(3) { background: #28C840; }

.preview-content {
    display: flex;
    height: 400px;
}

.preview-sidebar {
    width: 60px;
    background: var(--secondary);
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.preview-nav-item {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
}

.preview-nav-item.active {
    background: var(--primary);
}

.preview-main {
    flex: 1;
    padding: 20px;
    background: var(--bg-secondary);
}

.preview-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.preview-card {
    height: 80px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.preview-chart {
    height: 200px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-subtitle {
        margin: 0 auto 32px;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }
}

@media (max-width: 576px) {
    .hero-cta {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }
}

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

.features {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(124, 58, 237, 0.1));
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
}

@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

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

.how-it-works {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 280px;
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.step-content h3 {
    margin-bottom: 12px;
}

.step-content p {
    color: var(--text-secondary);
}

.step-connector {
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    margin-bottom: 80px;
}

@media (max-width: 768px) {
    .steps {
        flex-direction: column;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin-bottom: 0;
    }
}

/* ======================================
   Testimonials Section
   ====================================== */

.testimonials {
    padding: 120px 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.testimonial-content {
    margin-bottom: 24px;
}

.testimonial-content p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-info strong {
    color: var(--text-primary);
}

.author-info span {
    color: var(--text-muted);
    font-size: 0.875rem;
}

@media (max-width: 992px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

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

.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
}

.cta-content {
    text-align: center;
    color: white;
}

.cta-content h2 {
    margin-bottom: 16px;
}

.cta-content p {
    opacity: 0.9;
    margin-bottom: 32px;
    font-size: 1.125rem;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

@media (max-width: 576px) {
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}

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

.footer {
    background: var(--secondary);
    color: white;
    padding: 80px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.2s;
}

.social-links a:hover {
    background: var(--primary);
}

.footer-links h4 {
    margin-bottom: 20px;
    font-size: 1rem;
}

.footer-links a {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 12px;
    transition: color 0.2s;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 32px;
    text-align: center;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 576px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}