/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --accent-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    font-size: 16px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    line-height: 1.6;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

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

/* Sections */
.section {
    padding: 5rem 0;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-dark);
}

/* About Section */
.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.lead {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.about-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.about-card ul {
    list-style: none;
    padding-left: 0;
}

.about-card ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

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

/* Project Cards */
.project-card {
    background-color: var(--bg-white);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.3s ease;
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
}

.project-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.5rem 2rem;
}

.project-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.project-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.project-tag {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.project-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin: 0;
}

.project-summary {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.project-link {
    margin-bottom: 1.5rem;
}

.project-link .btn {
    display: inline-block;
}

.project-actions {
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.video-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.video-btn::before {
    content: "▶";
    font-size: 0.875rem;
    margin-right: 0.25rem;
}

.project-content {
    padding: 2rem;
}

/* Expandable Content */
.expand-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    margin-top: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.expand-btn::after {
    content: "▼";
    font-size: 0.75rem;
    transition: transform 0.3s ease;
}

.expand-btn.expanded::after {
    transform: rotate(180deg);
}

.expandable-content {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.4s ease, padding 0.4s ease;
    padding: 0;
}

.expandable-content.expanded {
    max-height: 5000px;
    opacity: 1;
    padding-top: 1.5rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.project-detail {
    margin-bottom: 2rem;
}

.project-detail h4 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.project-features {
    margin-bottom: 2rem;
}

.project-features h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.project-features ul {
    list-style: none;
    padding-left: 0;
}

.project-features ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.project-features ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.project-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.info-item h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.info-item ul {
    list-style: none;
    padding-left: 0;
}

.info-item ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.info-item ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.tech-stack {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.tech-stack h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tech-tag {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
}

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

.automation-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.automation-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.automation-summary {
    margin-bottom: 1rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.automation-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.automation-detail {
    margin-bottom: 1.5rem;
}

.automation-detail h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
}

.time-saved {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-top: 1.5rem;
}

.time-saved h4 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
}

.time-saved ul {
    list-style: none;
    padding-left: 0;
}

.time-saved ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.time-saved ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

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

.service-card {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.service-card p {
    flex-grow: 1;
    margin-bottom: 1rem;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.service-benefits {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.service-card .expandable-content ul {
    list-style: none;
    padding-left: 0;
    margin-top: 0.75rem;
}

.service-card .expandable-content ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.service-card .expandable-content ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.service-benefits h4 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    font-weight: 600;
}

.service-benefits ul {
    list-style: none;
    padding-left: 0;
}

.service-benefits ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.service-benefits ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

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

.tech-category {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.tech-category h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.tech-category ul {
    list-style: none;
    padding-left: 0;
}

.tech-category ul li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.tech-category ul li:last-child {
    border-bottom: none;
}

/* Working Model Section */
.working-model-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    gap: 2rem;
}

.model-item {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.model-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.phases-list,
.benefits-list {
    margin-top: 1.5rem;
}

.phases-list h4,
.benefits-list h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
    font-weight: 600;
}

.phases-list ol {
    padding-left: 1.5rem;
}

.phases-list ol li {
    padding: 0.5rem 0;
}

.benefits-list ul {
    list-style: none;
    padding-left: 0;
}

.benefits-list ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.benefits-list ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Contact Section */
.contact-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.contact-section .section-title {
    color: white;
}

.contact-content {
    max-width: 1000px;
    margin: 0 auto;
}

.contact-intro {
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 2rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.contact-card ul {
    list-style: none;
    padding-left: 0;
}

.contact-card ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.contact-card ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: white;
    font-weight: bold;
}

.contact-cta {
    text-align: center;
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-cta p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.contact-cta-text {
    font-size: 1.25rem;
    margin: 1.5rem 0;
}

.contact-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

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

.contact-buttons .btn-secondary {
    background-color: transparent;
    color: white;
    border-color: white;
}

/* Footer */
.footer {
    background-color: var(--text-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

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

.scroll-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
    box-shadow: 0 15px 25px -3px rgba(0, 0, 0, 0.2);
}

.scroll-to-top:active {
    transform: translateY(-3px);
}

.scroll-to-top svg {
    width: 24px;
    height: 24px;
}

/* Video Modal */
.video-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    overflow: auto;
}

.video-modal-content {
    position: relative;
    max-width: 800px;
    margin: 60px auto;
    background: #000;
    padding: 10px;
    border-radius: 8px;
}

.video-modal-content video {
    width: 100%;
    height: auto;
    display: block;
}

.close-btn {
    position: absolute;
    right: 12px;
    top: 6px;
    font-size: 26px;
    color: #fff;
    cursor: pointer;
    z-index: 10;
    line-height: 1;
    font-weight: bold;
    transition: color 0.3s ease;
}

.close-btn:hover {
    color: #ccc;
}

@media (max-width: 768px) {
    .video-modal-content {
        max-width: 95%;
        margin: 20px auto;
        padding: 8px;
    }
    
    .close-btn {
        right: 8px;
        top: 4px;
        font-size: 24px;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-md);
        border-top: 1px solid var(--border-color);
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section {
        padding: 3rem 0;
    }

    .about-grid,
    .automation-grid,
    .services-grid,
    .tech-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .project-info-grid {
        grid-template-columns: 1fr;
    }

    .hero-cta,
    .contact-buttons {
        flex-direction: column;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .container {
        padding: 0 15px;
    }

    .project-content,
    .about-card,
    .automation-card,
    .service-card {
        padding: 1.5rem;
    }
}