/* ========================================
   Variables & Reset
======================================== */

:root {
    /* Colors - Professional B2B Palette */
    --color-primary: #0F172A;        /* Slate 900 - Dark Navy */
    --color-primary-light: #1E293B;  /* Slate 800 */
    --color-accent: #3B82F6;         /* Blue 500 */
    --color-accent-dark: #2563EB;    /* Blue 600 */
    --color-text: #0F172A;
    --color-text-light: #64748B;     /* Slate 500 */
    --color-text-muted: #94A3B8;     /* Slate 400 */
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8FAFC;         /* Slate 50 */
    --color-bg-card: #FFFFFF;
    --color-border: #E2E8F0;         /* Slate 200 */
    --color-success: #10B981;        /* Green 500 */
    --color-warning: #F59E0B;        /* Amber 500 */

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

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

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text-light);
}

strong {
    font-weight: 600;
    color: var(--color-text);
}

.highlight {
    background: linear-gradient(120deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* ========================================
   Container & Layout
======================================== */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-xl) 0;
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.logo-icon {
    width: 32px;
    height: 32px;
    stroke-width: 2;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-menu a:hover::after {
    width: 100%;
}

.btn-nav {
    padding: 0.625rem 1.25rem !important;
    background: var(--color-primary);
    color: white !important;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-nav::after {
    display: none;
}

.btn-nav:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-family: var(--font-primary);
}

.btn-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

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

.hero {
    margin-top: 80px;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    width: 16px;
    height: 16px;
    stroke-width: 2;
    color: var(--color-success);
}

.hero-title {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.hero-description {
    margin-bottom: 2rem;
    font-size: 1.25rem;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.hero-visual {
    position: relative;
    height: 500px;
}

.visual-card {
    position: absolute;
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--color-border);
}

.visual-icon {
    width: 40px;
    height: 40px;
    stroke-width: 1.5;
    color: var(--color-primary);
    flex-shrink: 0;
}

.visual-card span {
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.95rem;
}

.card-float-1 {
    top: 10%;
    left: 10%;
    animation: float 6s ease-in-out infinite;
}

.card-float-2 {
    top: 50%;
    right: 10%;
    animation: float 8s ease-in-out infinite 1s;
}

.card-float-3 {
    bottom: 10%;
    left: 20%;
    animation: float 7s ease-in-out infinite 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* ========================================
   Section Headers
======================================== */

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.section-badge {
    display: inline-block;
    padding: 0.375rem 1rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.section-title {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

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

/* ========================================
   Problem/Solution Section
======================================== */

.solution {
    background: var(--color-bg-alt);
}

.problem-solution-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.problem-card,
.solution-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}

.card-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-radius: var(--radius-lg);
    stroke-width: 1.5;
}

.card-icon.problem {
    background: #FEF2F2;
    color: #DC2626;
}

.card-icon.solution {
    background: #F0FDF4;
    color: var(--color-success);
}

.problem-card h3,
.solution-card h3 {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}

.problem-list,
.solution-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.problem-list li,
.solution-list li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-light);
}

.problem-list li::before {
    content: '✕';
    position: absolute;
    left: 0;
    color: #DC2626;
    font-weight: 700;
}

.solution-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: 700;
}

/* ========================================
   Products Section
======================================== */

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.product-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
    cursor: pointer;
}

.product-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-icon {
    width: 64px;
    height: 64px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: all var(--transition-base);
}

.product-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 1.5;
    color: var(--color-primary);
}

.product-card:hover .product-icon {
    background: var(--color-primary);
}

.product-card:hover .product-icon svg {
    color: white;
}

.product-card h3 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.product-card > p {
    margin-bottom: 1.5rem;
    font-size: 1rem;
    color: var(--color-text-light);
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.feature-list li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.feature-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

.product-tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-light);
    font-family: var(--font-mono);
}

/* ========================================
   Platform Section
======================================== */

.platform {
    background: var(--color-bg-alt);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.platform-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.platform-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.platform-icon {
    width: 48px;
    height: 48px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.platform-icon svg {
    width: 24px;
    height: 24px;
    stroke-width: 2;
    color: var(--color-primary);
}

.platform-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.platform-card p {
    font-size: 0.95rem;
}

/* ========================================
   Advantages Section
======================================== */

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.advantage-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--color-accent);
    transform: scaleY(0);
    transition: transform var(--transition-base);
    transform-origin: top;
}

.advantage-card:hover::before {
    transform: scaleY(1);
}

.advantage-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-bg-alt);
    line-height: 1;
    margin-bottom: 1rem;
}

.advantage-card h3 {
    margin-bottom: 0.75rem;
    color: var(--color-primary);
}

.advantage-card p {
    font-size: 0.95rem;
}

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

.use-cases {
    background: var(--color-bg-alt);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.use-case-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-base);
}

.use-case-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.use-case-icon {
    width: 64px;
    height: 64px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    transition: all var(--transition-base);
}

.use-case-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 1.5;
    color: var(--color-primary);
}

.use-case-card:hover .use-case-icon {
    background: var(--color-primary);
}

.use-case-card:hover .use-case-icon svg {
    color: white;
}

.use-case-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
    color: var(--color-primary);
}

.use-case-card p {
    font-size: 0.9rem;
}

/* ========================================
   Pricing Section
======================================== */

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.pricing-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-border);
    position: relative;
    transition: all var(--transition-base);
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: white;
    padding: 0.375rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.pricing-header h3 {
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.pricing-header p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.pricing-price {
    text-align: center;
    margin-bottom: 2rem;
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
}

.price-currency {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.pricing-features svg {
    width: 20px;
    height: 20px;
    stroke-width: 2.5;
    color: var(--color-success);
    flex-shrink: 0;
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

.pricing-note {
    text-align: center;
    padding: 1.5rem;
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.pricing-note p {
    margin: 0;
    font-size: 0.95rem;
}

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

.cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta h2 {
    margin-bottom: 1rem;
    color: white;
}

.cta > p {
    margin-bottom: 3rem;
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
}

.cta-form {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row:has(textarea),
.form-row:has(select:only-child) {
    grid-template-columns: 1fr;
}

.cta-form input,
.cta-form select,
.cta-form textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: all var(--transition-fast);
    background: white;
}

.cta-form input:focus,
.cta-form select:focus,
.cta-form textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.cta-form textarea {
    resize: vertical;
}

.form-notice {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

.footer {
    background: var(--color-primary);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: white;
    margin-bottom: 1rem;
}

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-col p {
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-compliance {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

.footer-compliance svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
    color: var(--color-success);
    flex-shrink: 0;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.footer-contact svg {
    width: 16px;
    height: 16px;
    stroke-width: 2;
    flex-shrink: 0;
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

/* ========================================
   Back to Top Button
======================================== */

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-primary-light);
    transform: translateY(-4px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    stroke-width: 2;
}

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

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        display: none;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: var(--spacing-lg) 0;
    }

    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
        justify-content: center;
    }

    .problem-solution-grid {
        grid-template-columns: 1fr;
    }

    .platform-grid {
        grid-template-columns: 1fr;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* ========================================
   Animations
======================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

.hidden { display: none; }
.visible { display: block; }