/* 
 * Premium Static Demo - Stylesheet
 * Architecture: Vanilla CSS, CSS Variables, Mobile-First
 */

:root {
    /* Color Palette */
    --bg-base: #050505;
    --bg-alt: #0a0a0a;
    --surface: #111111;
    --surface-hover: #1a1a1a;
    --border: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --text-main: #ffffff;
    --text-muted: #888888;
    
    --accent: #ffffff;
    --accent-invert: #000000;
    --glow: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Layout */
    --container-max: 1200px;
    --nav-height: 72px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

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

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.w-full { width: 100%; }

/* Typography */
h1, h2, h3, h4 {
    color: var(--text-main);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    background: linear-gradient(180deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 500;
    margin-bottom: 16px;
}

h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 12px;
}

p {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
}

.text-center p {
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 100px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: transform var(--transition-fast), background var(--transition-fast), opacity var(--transition-fast);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

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

.btn-primary:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-height);
    background: rgba(5, 5, 5, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    transition: transform 0.3s ease;
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.logo span {
    color: var(--text-muted);
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.badge {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 6px 12px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
}

/* Sections */
.section {
    padding: 120px 0;
    position: relative;
}

.section-alt {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

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

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 800px; height: 800px;
    background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
    transition: transform 0.1s ease-out;
}

.hero p {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    margin-bottom: 40px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Stats Section */
.stats-section {
    padding: 64px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-alt);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    text-align: center;
}

.stat-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
}

.stat-value {
    font-size: 3.5rem;
    font-weight: 600;
    letter-spacing: -0.04em;
    color: var(--text-main);
    line-height: 1.1;
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
    word-wrap: break-word;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Feature Cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-smooth), border-color var(--transition-fast);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255,255,255,0.06), transparent 40%);
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
}

.feature-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 48px; height: 48px;
    background: var(--surface-hover);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--text-main);
}

/* Split Layout */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

/* Tabs Component */
.tabs-component {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.tabs-header {
    display: flex;
    border-bottom: 1px solid var(--border);
    background: var(--bg-alt);
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    padding: 16px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-main);
    background: var(--surface-hover);
}

.tab-btn.active {
    color: var(--text-main);
    border-bottom-color: var(--accent);
}

.tabs-body {
    padding: 32px;
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-fast);
}

.tab-content.active {
    display: block;
}

.tab-content h4 {
    margin-bottom: 8px;
}

.tab-content p {
    font-size: 1rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mockup */
.mockup-container {
    perspective: 1000px;
}

.browser-mockup {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 40px 80px rgba(0,0,0,0.5);
}

.browser-header {
    height: 48px;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 16px;
    position: relative;
}

.browser-dots {
    display: flex;
    gap: 8px;
}

.browser-dots span {
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--border);
}

.browser-url {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface);
    padding: 4px 16px;
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

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

.mockup-sidebar {
    width: 240px;
    border-right: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mockup-line {
    height: 12px;
    background: var(--border);
    border-radius: 4px;
    width: 100%;
}

.mockup-line.short { width: 60%; }

.mockup-content {
    flex: 1;
    padding: 32px;
    display: flex;
    flex-direction: column;
}

.mockup-title {
    height: 32px;
    width: 40%;
    background: var(--border);
    border-radius: 6px;
    margin-bottom: 32px;
}

.mockup-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    flex: 1;
}

.mockup-box {
    background: var(--surface-hover);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

/* Tooltips */
.tooltip-trigger {
    border-bottom: 1px dotted var(--text-muted);
    cursor: help;
    position: relative;
}

.tooltip-trigger::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%; left: 50%;
    transform: translateX(-50%) translateY(8px);
    background: var(--accent);
    color: var(--accent-invert);
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    pointer-events: none;
    z-index: 10;
}

.tooltip-trigger:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-8px);
}

/* Gallery & Filter */
.gallery-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--accent);
    color: var(--accent-invert);
    border-color: var(--accent);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.gallery-item {
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
}

.gallery-placeholder {
    background: var(--surface);
    border: 1px solid var(--border);
    height: 240px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Carousel */
.carousel-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: 16px;
}

.carousel-track {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    padding: 16px 0;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.carousel-track::-webkit-scrollbar {
    display: none;
}

.carousel-slide {
    min-width: 320px;
    scroll-snap-align: center;
    flex: 0 0 auto;
}

.slide-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 500;
}

.carousel-control {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 48px; height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.carousel-control:hover {
    background: var(--surface-hover);
    transform: scale(1.05);
}

/* Timeline */
.timeline {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0; bottom: 0; left: 7px;
    width: 2px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -40px; top: 4px;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--bg-alt);
    border: 2px solid var(--accent);
    z-index: 2;
}

.timeline-content h3 {
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 1rem;
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    align-items: center;
}

.pricing-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--accent);
    background: var(--surface-hover);
    transform: scale(1.05);
    z-index: 2;
}

.pricing-badge {
    position: absolute;
    top: 0; left: 50%;
    transform: translate(-50%, -50%);
    background: var(--accent);
    color: var(--accent-invert);
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.pricing-amount {
    font-size: 3rem;
    font-weight: 600;
    margin: 16px 0 32px;
    line-height: 1;
}

.pricing-amount span {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
    flex: 1;
}

.pricing-features li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* FAQ Accordion */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid var(--border);
}

.accordion-trigger {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-main);
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    text-align: left;
}

.accordion-title {
    font-size: 1.125rem;
    font-weight: 500;
}

.accordion-icon {
    width: 20px; height: 20px;
    position: relative;
}

.accordion-icon::before, .accordion-icon::after {
    content: '';
    position: absolute;
    background: var(--text-main);
    transition: transform var(--transition-fast);
}

.accordion-icon::before {
    top: 9px; left: 0; width: 20px; height: 2px;
}

.accordion-icon::after {
    top: 0; left: 9px; width: 2px; height: 20px;
}

.accordion-trigger[aria-expanded="true"] .accordion-icon::after {
    transform: rotate(90deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-smooth);
}

.accordion-inner {
    padding-bottom: 24px;
    color: var(--text-muted);
}

/* Form Validation */
.demo-form {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.875rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    background: var(--bg-base);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.error-message {
    color: #ff5f56;
    font-size: 0.75rem;
    margin-top: 8px;
    display: none;
}

.form-group.invalid input {
    border-color: #ff5f56;
}

.form-group.invalid .error-message {
    display: block;
}

.form-success {
    background: rgba(39, 201, 63, 0.1);
    color: #27c93f;
    border: 1px solid rgba(39, 201, 63, 0.2);
    padding: 16px;
    border-radius: var(--radius-sm);
    margin-top: 24px;
    text-align: center;
    display: none;
}

/* Trust Section */
.trust-heading {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 40px;
}

.trust-logos {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
    opacity: 0.4;
}

.trust-logo {
    font-family: var(--font-mono);
    font-size: 1rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    padding: 32px;
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-smooth);
}

.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-placeholder {
    background: var(--bg-base);
    border: 1px solid var(--border);
    height: 160px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.modal-footer {
    margin-top: 32px;
}

/* Footer */
.footer {
    padding: 64px 0;
    border-top: 1px solid var(--border);
}

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

.footer-brand {
    font-weight: 600;
}

.footer-brand span {
    color: var(--text-muted);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Responsive Adjustments */
@media (max-width: 992px) {
    .split-layout {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .pricing-card.featured {
        transform: scale(1);
    }
}

@media (max-width: 768px) {
    .nav-links, .nav-actions {
        display: none;
    }
    
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-base);
        padding: 24px;
        border-bottom: 1px solid var(--border);
        gap: 24px;
        text-align: center;
    }
    
    .nav-actions.active {
        display: flex;
        position: absolute;
        top: calc(var(--nav-height) + 240px); /* Position below links */
        left: 0;
        right: 0;
        justify-content: center;
        padding-bottom: 24px;
        background: var(--bg-base);
        border-bottom: 1px solid var(--border);
    }

    .mobile-menu-btn {
        display: block;
    }
    .section {
        padding: 80px 0;
    }
    .browser-body {
        flex-direction: column;
        height: auto;
    }
    .mockup-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        flex-direction: row;
    }
    .mockup-grid {
        grid-template-columns: 1fr;
    }
    .carousel-control {
        display: none;
    }
    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}