/* =========================================================================
   SYNTH AI - MODERN SAAS LANDING PAGE STYLES
   ========================================================================= */

/* --- CSS Variables --- */
:root {
    /* Colors */
    --bg-main: #0a0a0c;
    --bg-secondary: #121217;
    --text-primary: #ededed;
    --text-secondary: #a1a1aa;
    
    /* Accents (Purple/Violet) */
    --accent-purple: #a855f7;
    --accent-indigo: #6366f1;
    --gradient-accent: linear-gradient(135deg, var(--accent-purple), var(--accent-indigo));
    
    /* UI Elements */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(255, 255, 255, 0.15);
    
    /* Layout */
    --container-width: 1200px;
    --container-padding: 2rem;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Base Reset & Typography --- */
*, *::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;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

/* --- Utility Classes --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.w-full { width: 100%; }
.text-center { text-align: center; }

/* Section Styles */
.section {
    padding: 6rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

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

/* Background Glows */
.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.15) 0%, rgba(99, 102, 241, 0) 70%);
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    pointer-events: none;
}

.top-glow { top: -200px; left: 50%; transform: translateX(-50%); }
.bottom-glow { bottom: -200px; right: 0; }
.inner-glow { top: 50%; left: 50%; transform: translate(-50%, -50%); width: 120%; height: 120%; }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 500;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-accent);
    color: white;
    box-shadow: 0 4px 14px rgba(168, 85, 247, 0.25);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--glass-border-hover);
    transform: translateY(-2px);
}

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

.btn-text:hover { color: var(--text-primary); }
.btn-small { padding: 0.5rem 1.25rem; font-size: 0.875rem; }
.btn-large { padding: 1rem 2rem; font-size: 1.125rem; }

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.25rem 0;
    transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal);
    background: rgba(10, 10, 12, 0.6);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    width: 24px;
    height: 24px;
    background: var(--gradient-accent);
    mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M12 2L2 7L12 12L22 7L12 2Z" fill="currentColor"/><path d="M2 17L12 22L22 17" fill="currentColor"/><path d="M2 12L12 17L22 12" fill="currentColor"/></svg>') no-repeat center;
    -webkit-mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path stroke="currentColor" stroke-width="2" d="M12 2L2 7L12 12L22 7L12 2Z"/><path stroke="currentColor" stroke-width="2" d="M2 17L12 22L22 17"/><path stroke="currentColor" stroke-width="2" d="M2 12L12 17L22 12"/></svg>') no-repeat center;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

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

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

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* --- Hero Section --- */
.hero {
    padding: 10rem 0 6rem;
    text-align: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-purple);
    margin-bottom: 2rem;
}

.badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent-indigo);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-indigo);
}

.hero-title {
    font-size: 4.5rem;
    line-height: 1.1;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.hero-ctas {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 5rem;
}

/* Typewriter Animation */
.type-wrap { display: inline-block; }
.cursor {
    display: inline-block;
    width: 4px;
    height: 1em;
    background-color: var(--text-primary);
    vertical-align: text-bottom;
    margin-left: 2px;
    animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* App Mockup (Visual) */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(12px);
    overflow: hidden;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.app-mockup {
    max-width: 900px;
    margin: 0 auto;
    border-radius: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.app-header {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.2);
}

.window-controls {
    display: flex;
    gap: 0.5rem;
}
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.close { background: #ff5f56; }
.dot.min { background: #ffbd2e; }
.dot.max { background: #27c93f; }

.app-title {
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-family: monospace;
}

.app-body {
    display: flex;
    height: 400px;
}

.app-sidebar {
    width: 200px;
    border-right: 1px solid var(--glass-border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.app-editor {
    flex: 1;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: rgba(18, 18, 23, 0.4);
}

.skeleton-line {
    height: 12px;
    background: var(--glass-border);
    border-radius: 4px;
    width: 80%;
}
.skeleton-line.short { width: 40%; }
.skeleton-line.medium { width: 60%; }
.skeleton-line.full { width: 100%; }
.skeleton-line.title { height: 24px; width: 50%; margin-bottom: 1rem; background: var(--text-primary); opacity: 0.8;}

.ai-suggestion {
    margin-top: 2rem;
    background: linear-gradient(90deg, rgba(168, 85, 247, 0.1), transparent);
    border-left: 2px solid var(--accent-purple);
    padding: 1rem 1.5rem;
    display: flex;
    gap: 1rem;
    border-radius: 0 8px 8px 0;
}

.ai-icon { font-size: 1.25rem; }

/* --- Features Section --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    backdrop-filter: blur(12px);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    margin-top: 1.5rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --- Steps Section --- */
.steps-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
}
@media (min-width: 900px) {
    .steps-container {
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }
}

.step-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.step-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent-purple);
    font-family: monospace;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --- Pricing Section --- */
.billing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--glass-border);
    transition: .4s;
    border-radius: 34px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 26px; width: 26px;
    left: 4px; bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider { background: var(--gradient-accent); }
input:checked + .slider:before { transform: translateX(26px); }

.discount-badge {
    background: rgba(168, 85, 247, 0.2);
    color: var(--accent-purple);
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    margin-left: 0.5rem;
    vertical-align: middle;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center;
}

.pricing-card {
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border-color: var(--accent-purple);
    background: rgba(255, 255, 255, 0.05);
    transform: scale(1.05);
}
.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 1rem;
    border-radius: 9999px;
}

.tier-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.tier-price {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 1rem 0;
    display: flex;
    align-items: baseline;
}
.currency, .period { font-size: 1rem; color: var(--text-secondary); font-weight: 400; }

.tier-desc {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.tier-features {
    margin-top: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.tier-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}
.tier-features li svg {
    width: 20px; height: 20px;
    stroke: var(--accent-purple);
    fill: none;
    stroke-width: 2;
    flex-shrink: 0;
}
.tier-features li.disabled { color: var(--text-secondary); opacity: 0.5; }
.tier-features li.disabled svg { stroke: var(--text-secondary); }

/* --- Testimonials --- */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.review-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.stars {
    color: #fbbf24;
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.review-text {
    font-size: 1.05rem;
    font-style: italic;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.reviewer {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.reviewer-name { font-weight: 600; font-size: 0.95rem; }
.reviewer-role { color: var(--text-secondary); font-size: 0.85rem; }

/* --- CTA Banner --- */
.cta-banner {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 5rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.cta-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 2.5rem;
    position: relative;
    z-index: 1;
}

.cta-shadow {
    position: relative;
    z-index: 1;
}

/* --- Footer --- */
.footer {
    border-top: 1px solid var(--glass-border);
    padding: 4rem 0 2rem;
    background: var(--bg-secondary);
}

.footer-container {
    display: grid;
    /* ... wait, I will rely on the HTML structure ... */
}

/* --- Mobile Menu --- */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-main);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-link {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 0.5rem 0;
}

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

/* Note: Mobile responsiveness down below */
@media (max-width: 768px) {
    .nav-links, .nav-actions { display: none; }
    .mobile-menu-btn { display: block; }
    .hero { padding: 8rem 0 4rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-subtitle { font-size: 1rem; }
    .pricing-card.popular { transform: scale(1); }
    .pricing-card.popular:hover { transform: translateY(-5px); }
    .section-title { font-size: 2rem; }
    .app-body { height: 300px; flex-direction: column; }
    .app-sidebar { width: 100%; height: 60px; border-right: none; border-bottom: 1px solid var(--glass-border); flex-direction: row; align-items: center; }
}

/* Utilities for animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }

.fade-in-up {
    animation: fadeInUp 0.8s cubic-bezier(0.5, 0, 0, 1) both;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}