/* Base Styles */
:root {
    --color-primary: #3B82F6;
    --color-primary-dark: #1E40AF;
    --color-secondary: #10B981;
    --color-secondary-dark: #065F46;
    --color-dark: #111827;
    --color-dark-lighter: #1F2937;
    --color-dark-light: #374151;
    --color-text: #F3F4F6;
    --color-text-muted: #9CA3AF;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-dark);
    color: var(--color-text);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(17, 24, 39, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 120px;
    padding: 0 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.logo img {
    height: 100px;
    width: auto;
}

.desktop-menu {
    display: none;
}

.nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: color 0.2s;
}

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

.nav-link.active {
    color: var(--color-primary);
}

/* Dropdown Navigation */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-dark-lighter);
    min-width: 300px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    border-radius: 0.5rem;
    padding: 1rem;
    z-index: 1001;
    border: 1px solid var(--color-dark-light);
}

.nav-dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-section {
    margin-bottom: 1.5rem;
}

.dropdown-section:last-child {
    margin-bottom: 0;
}

.dropdown-section h4 {
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dropdown-section a {
    display: block;
    color: var(--color-text-muted);
    text-decoration: none;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    transition: color 0.2s;
    border-bottom: 1px solid transparent;
}

.dropdown-section a:hover {
    color: var(--color-text);
    border-bottom-color: var(--color-primary);
}

/* Mobile Dropdown */
.mobile-dropdown {
    position: relative;
}

.mobile-dropdown-content {
    display: none;
    background-color: var(--color-dark);
    padding: 0.5rem 0 0.5rem 1rem;
    border-left: 2px solid var(--color-primary);
    margin-left: 1rem;
}

.mobile-dropdown.active .mobile-dropdown-content {
    display: block;
}

.mobile-dropdown-section {
    margin-bottom: 1rem;
}

.mobile-dropdown-section:last-child {
    margin-bottom: 0;
}

.mobile-dropdown-section h4 {
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mobile-dropdown-section .mobile-nav-link {
    display: block;
    padding-left: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.mobile-dropdown-section .mobile-nav-link:hover {
    color: var(--color-text);
}

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

/* Mobile Menu */
.mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-icon {
    display: block;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
    transition: background-color 0.2s;
}

.menu-icon::before,
.menu-icon::after {
    content: '';
    position: absolute;
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-text);
    transition: transform 0.2s;
}

.menu-icon::before {
    top: -6px;
}

.menu-icon::after {
    bottom: -6px;
}

.mobile-menu {
    display: none;
    background-color: var(--color-dark-lighter);
    padding: 1rem;
    border-top: 1px solid var(--color-dark-light);
}

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

.mobile-nav-link {
    display: block;
    color: var(--color-text-muted);
    text-decoration: none;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-dark-light);
}

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

.mobile-nav-link.active {
    color: var(--color-primary);
}

.mobile-btn {
    margin-top: 1rem;
    width: 100%;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-lighter) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23374151" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
}

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

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    max-width: 36rem;
    margin-left: auto;
    margin-right: auto;
}

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

/* Breadcrumb */
.breadcrumb {
    padding: 1rem 0;
    background-color: var(--color-dark-lighter);
    margin-top: 120px;
}

.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

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

/* Solutions Categories */
.solutions-categories {
    padding: 5rem 0;
    background-color: var(--color-dark-lighter);
}

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

.solution-category {
    background-color: var(--color-dark);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.category-header {
    text-align: center;
    margin-bottom: 2rem;
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.category-header p {
    color: var(--color-text-muted);
}

.category-items {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.solution-item {
    display: block;
    background-color: var(--color-dark-lighter);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s;
    border: 1px solid transparent;
}

.solution-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.solution-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.solution-item p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.learn-more {
    color: var(--color-secondary);
    font-weight: 500;
}

/* Features Section */
.features {
    padding: 5rem 0;
    background-color: var(--color-dark-lighter);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.feature-card {
    background-color: var(--color-dark);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.feature-card .price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 1rem 0;
}

.feature-card ul {
    list-style: none;
    margin: 1rem 0;
    flex-grow: 1;
}

.feature-card ul li {
    padding: 0.5rem 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.feature-card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
    font-weight: bold;
}

.feature-card button {
    margin-top: auto;
    width: 100%;
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* Additional Sections */
.how-it-works,
.optimization-process,
.consulting-process,
.how-to-collaborate {
    padding: 5rem 0;
    background-color: var(--color-dark);
}

.steps-grid,
.process-steps,
.collaboration-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.step,
.process-step,
.collaboration-step {
    background-color: var(--color-dark-lighter);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
}

.step-number {
    display: inline-block;
    width: 3rem;
    height: 3rem;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h3,
.process-step h3,
.collaboration-step h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.step p,
.process-step p,
.collaboration-step p {
    color: var(--color-text-muted);
}

/* Analysis Types, Services, etc. */
.analysis-types,
.services-offered,
.project-types,
.optimization-methods,
.design-parameters,
.research-topics,
.collaboration-types,
.application-types,
.technologies,
.software-capabilities,
.system-requirements,
.package-options,
.tech-specs,
.case-studies,
.tools-software,
.portfolio,
.publications,
.current-projects {
    padding: 5rem 0;
    background-color: var(--color-dark-lighter);
}

.analysis-grid,
.services-grid,
.project-grid,
.methods-grid,
.parameters-grid,
.topics-grid,
.collaboration-grid,
.app-types-grid,
.tech-grid,
.capabilities-grid,
.requirements-grid,
.packages-grid,
.specs-grid,
.case-studies-grid,
.tools-grid,
.portfolio-grid,
.publications-grid,
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.analysis-item,
.service-item,
.project-type,
.method-item,
.parameter-category,
.topic-item,
.collaboration-type,
.app-type-item,
.tech-category,
.capability-item,
.requirement-item,
.package-card,
.spec-item,
.case-study,
.tool-category,
.portfolio-item,
.publication-item,
.project-item {
    background-color: var(--color-dark);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.package-card.featured {
    border: 2px solid var(--color-primary);
    transform: scale(1.05);
}

.analysis-item h3,
.service-item h3,
.project-type h3,
.method-item h3,
.parameter-category h3,
.topic-item h3,
.collaboration-type h3,
.app-type-item h3,
.tech-category h3,
.capability-item h3,
.requirement-item h3,
.package-card h3,
.spec-item h3,
.case-study h3,
.tool-category h3,
.portfolio-item h3,
.publication-item h3,
.project-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.analysis-item ul,
.service-item ul,
.project-type ul,
.method-item ul,
.parameter-category ul,
.topic-item ul,
.collaboration-type ul,
.app-type-item ul,
.tech-category ul,
.capability-item ul,
.requirement-item ul,
.package-card ul,
.spec-item ul,
.case-study ul,
.tool-category ul,
.portfolio-item ul,
.publication-item ul,
.project-item ul {
    list-style: none;
    padding: 0;
}

.analysis-item li,
.service-item li,
.project-type li,
.method-item li,
.parameter-category li,
.topic-item li,
.collaboration-type li,
.app-type-item li,
.tech-category li,
.capability-item li,
.requirement-item li,
.package-card li,
.spec-item li,
.case-study li,
.tool-category li,
.portfolio-item li,
.publication-item li,
.project-item li {
    padding: 0.25rem 0;
    color: var(--color-text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.analysis-item li::before,
.service-item li::before,
.project-type li::before,
.method-item li::before,
.parameter-category li::before,
.topic-item li::before,
.collaboration-type li::before,
.app-type-item li::before,
.tech-category li::before,
.capability-item li::before,
.requirement-item li::before,
.package-card li::before,
.spec-item li::before,
.case-study li::before,
.tool-category li::before,
.portfolio-item li::before,
.publication-item li::before,
.project-item li::before {
    content: '•';
    color: var(--color-secondary);
    position: absolute;
    left: 0;
}

.price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 1rem 0;
}

.tech-tags,
.results,
.project-details,
.authors {
    display: inline-block;
    background-color: var(--color-dark-lighter);
    color: var(--color-text-muted);
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* CTA Section */
.cta {
    padding: 5rem 0;
    text-align: center;
}

.cta-text {
    color: var(--color-text-muted);
    max-width: 36rem;
    margin: 0 auto 2rem;
}

/* Media Queries */
@media (min-width: 768px) {
    .desktop-menu {
        display: flex;
        align-items: center;
        gap: 2rem;
    }

    .mobile-menu-btn {
        display: none;
    }

    /* Desktop dropdown positioning */
    .nav-dropdown {
        position: relative;
    }

    .dropdown-content {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 350px;
    }

    /* Ensure dropdown appears above other content */
    .nav-dropdown:hover .dropdown-content {
        display: block;
    }

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

    .hero-title {
        font-size: 5rem;
    }

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

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

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

    .analysis-grid,
    .services-grid,
    .project-grid,
    .methods-grid,
    .parameters-grid,
    .topics-grid,
    .collaboration-grid,
    .app-types-grid,
    .tech-grid,
    .capabilities-grid,
    .requirements-grid,
    .packages-grid,
    .specs-grid,
    .case-studies-grid,
    .tools-grid,
    .portfolio-grid,
    .publications-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .steps-grid,
    .process-steps,
    .collaboration-steps {
        grid-template-columns: repeat(4, 1fr);
    }

    .analysis-grid,
    .services-grid,
    .project-grid,
    .methods-grid,
    .parameters-grid,
    .topics-grid,
    .collaboration-grid,
    .app-types-grid,
    .tech-grid,
    .capabilities-grid,
    .requirements-grid,
    .packages-grid,
    .specs-grid,
    .case-studies-grid,
    .tools-grid,
    .portfolio-grid,
    .publications-grid,
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}