/* NebusAI Corporate Site Styles */
/* Modern B2B Corporate Design System */

/* ========== CSS Variables ========== */
:root {
    /* Brand Colors */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #10b981;
    --secondary-dark: #059669;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    --gradient-text: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    /* Background Colors */
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-subtle: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-darker: #020617;

    /* Border Colors */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;

    /* 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 -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --section-padding: 6rem;
    --container-max: 1200px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.025em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.025em;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

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

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== Header ========== */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
}

header nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    font-size: 1.75rem;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-subtle);
}

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

.nav-docs {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 0.5rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--bg-white);
    background: var(--primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.nav-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

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

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Buttons ========== */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    color: var(--bg-white);
    background: var(--primary);
    box-shadow: 0 1px 2px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    color: var(--text-primary);
    background: var(--bg-white);
    border: 1px solid var(--border-medium);
}

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

/* ========== Hero Section ========== */
.hero {
    background: var(--gradient-hero);
    padding: 8rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-light);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-full);
}

.hero h1 {
    color: var(--bg-white);
    margin-bottom: 1.5rem;
    font-size: 4rem;
}

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

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

/* ========== Section Styles ========== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}

.section-header h2 {
    margin-bottom: 1rem;
}

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

/* ========== Products Section ========== */
.products-section {
    padding: var(--section-padding) 0;
    background: var(--bg-white);
}

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

.product-card {
    display: flex;
    flex-direction: column;
    padding: 2.5rem;
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.product-card.olympus:hover {
    box-shadow: 0 20px 40px rgba(37, 99, 235, 0.15);
}

.product-card.revolution:hover {
    box-shadow: 0 20px 40px rgba(234, 88, 12, 0.15);
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.product-card h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.product-tagline {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1rem;
}

.product-card.revolution .product-tagline {
    color: #ea580c;
}

.product-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.product-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.product-features li::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary);
    background: rgba(16, 185, 129, 0.1);
    border-radius: 50%;
}

.product-cta {
    font-weight: 600;
    color: var(--primary);
    transition: color var(--transition-fast);
}

.product-card.revolution .product-cta {
    color: #ea580c;
}

.product-card:hover .product-cta {
    color: var(--primary-dark);
}

.product-card.revolution:hover .product-cta {
    color: #c2410c;
}

/* ========== Platform Section ========== */
.platform-section {
    padding: var(--section-padding) 0;
    background: var(--bg-subtle);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.capability-card {
    padding: 2rem;
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

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

.capability-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

.capability-card p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ========== Technology Section ========== */
.technology-section {
    padding: var(--section-padding) 0;
    background: var(--bg-white);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.tech-card {
    padding: 2rem;
    background: var(--bg-subtle);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.tech-card:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

.tech-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tech-icon {
    font-size: 2rem;
}

.tech-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.tech-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tech-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem;
    background: var(--bg-white);
    border-radius: var(--radius-md);
}

.tech-item strong {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.tech-item span {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ========== Company Section ========== */
.company-section {
    padding: var(--section-padding) 0;
    background: var(--bg-subtle);
}

.company-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.company-content h2 {
    margin-bottom: 1.5rem;
    text-align: left;
}

.company-content p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.company-values h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.value-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.value-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.value-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.value-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.value-item h4 {
    font-size: 1rem;
    margin-bottom: 0.375rem;
    color: var(--text-primary);
}

.value-item p {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* ========== Contact Section ========== */
.contact-section {
    padding: var(--section-padding) 0;
    background: var(--gradient-hero);
}

.contact-content {
    text-align: center;
}

.contact-content h2 {
    color: var(--bg-white);
    margin-bottom: 1rem;
}

.contact-content > p {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.contact-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    text-align: center;
}

.contact-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.2);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.contact-card h3 {
    color: var(--bg-white);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.contact-card p {
    color: var(--text-light);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
}

.contact-card span {
    font-size: 0.875rem;
    color: var(--primary-light);
    font-weight: 500;
}

/* ========== Footer ========== */
footer {
    background: var(--bg-darker);
    color: var(--bg-white);
    padding: 4rem 0 2rem;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9375rem;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--bg-white);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-column a {
    font-size: 0.9375rem;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--bg-white);
}

.footer-bottom {
    padding-top: 2rem;
    text-align: center;
}

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

/* ========== Responsive Design ========== */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.75rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

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

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

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

    .company-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .contact-options {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 4rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .nav-links,
    .nav-actions {
        display: none;
    }

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

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        padding: 1rem;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-lg);
    }

    .hero {
        padding: 5rem 0 4rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-ctas {
        flex-direction: column;
        align-items: center;
    }

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

    .value-item {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 1.875rem;
    }

    .product-card {
        padding: 1.5rem;
    }

    .capability-card {
        padding: 1.5rem;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }
}

/* ========== Utilities ========== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}