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

:root {
    /* Dark Theme (Default) - OpenAI inspired */
    --bg-primary: #212121;
    --bg-secondary: #2f2f2f;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --text-tertiary: #8e8e8e;
    --border-color: #444;
    --border-subtle: #3a3a3a;
    --accent-primary: #10a37f;
    --accent-hover: #0d8f6f;
    --accent-light: rgba(16, 163, 127, 0.1);
    --accent-border: rgba(16, 163, 127, 0.2);
    --white: #ffffff;
    --black: #000000;
}

[data-theme="light"] {
    /* Light Theme - OpenAI inspired */
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --bg-tertiary: #ececed;
    --text-primary: #0d0d0d;
    --text-secondary: #555555;
    --text-tertiary: #6e6e80;
    --border-color: #d1d1d6;
    --border-subtle: #e5e5e8;
    --accent-primary: #10a37f;
    --accent-hover: #0d8f6f;
    --accent-light: rgba(16, 163, 127, 0.08);
    --accent-border: rgba(16, 163, 127, 0.25);
    --white: #0d0d0d;
    --black: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Navigation */
.navbar {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo h2 {
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.logo-image {
    height: 40px;
    width: auto;
    display: block;
}

.nav-logo a {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 40px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 400;
    font-size: 0.9rem;
    text-transform: none;
    letter-spacing: 0;
    transition: color 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-primary);
}

.cta-btn {
    background: transparent;
    color: var(--accent-primary) !important;
    padding: 8px 20px;
    border: 1px solid var(--accent-primary);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.cta-btn:hover {
    background: var(--accent-primary);
    color: var(--black) !important;
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 20px;
    color: var(--text-primary);
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.theme-toggle svg {
    transition: all 0.3s ease;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.hamburger {
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active .hamburger:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.mobile-menu-toggle.active .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Hero Section */
.hero {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 140px 0 100px;
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 40px;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 30px;
    line-height: 1.2;
    color: var(--text-primary);
    text-transform: none;
    letter-spacing: -0.5px;
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.btn-primary,
.btn-secondary {
    padding: 15px 40px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 400;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--white);
    border: 1px solid var(--accent-primary);
}

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

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

.btn-secondary:hover {
    background: var(--accent-light);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* Hero Visual - Hide it for minimalist design */
.hero-visual {
    display: none;
}

/* Services Section */
.services {
    padding: 100px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-subtle);
}

.services h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 80px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-family: 'Inter', sans-serif;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.service-card {
    background: transparent;
    padding: 40px 20px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.3s ease;
    text-align: center;
}

.service-card:hover {
    border-color: var(--accent-primary);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}

/* Engagement Model Section */
.engagement-model {
    padding: 100px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
}

.engagement-model h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.phases-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.phase-card {
    background: var(--bg-primary);
    padding: 40px 30px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.phase-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-5px);
}

.phase-number {
    display: inline-block;
    background: var(--accent-primary);
    color: var(--bg-primary);
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.phase-card h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.phase-duration {
    color: var(--accent-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.phase-card > p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.phase-deliverables {
    list-style: none;
    padding-left: 0;
    margin-top: 20px;
}

.phase-deliverables li {
    color: var(--text-secondary);
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    font-size: 0.9rem;
    line-height: 1.6;
}

.phase-deliverables li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

/* Success Stories Section */
.success-stories {
    padding: 100px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-subtle);
}

.success-stories h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.story-card {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 40px;
    transition: all 0.3s ease;
}

.story-card:hover {
    border-color: #10a37f;
    transform: translateY(-5px);
}

.story-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #3a3a3a;
}

.company-logo {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #10a37f 0%, #0d8f6f 100%);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    flex-shrink: 0;
}

.company-info h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.industry {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.story-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.challenge {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    font-style: italic;
    padding-left: 20px;
    border-left: 3px solid var(--accent-primary);
}

.story-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 20px;
    margin: 10px 0;
}

.result-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
    background: var(--accent-light);
    border-radius: 4px;
    border: 1px solid var(--accent-border);
}

.result-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 5px;
}

.result-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.testimonial {
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.8;
    font-weight: 400;
}

.attribution {
    color: var(--accent-primary);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: right;
}

.cta-section {
    text-align: center;
    margin-top: 80px;
    padding: 60px 40px;
    background: rgba(16, 163, 127, 0.05);
    border: 1px solid rgba(16, 163, 127, 0.2);
    border-radius: 4px;
}

.cta-section h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cta-section p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 30px;
}

/* About Section */
.about {
    padding: 100px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-subtle);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-text h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.about-text p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    line-height: 1.8;
    font-family: 'Inter', sans-serif;
}

.benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.benefit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.benefit-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.benefit-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature {
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
}

.feature h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.feature p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}

.tech-stack-section {
    margin-top: 80px;
    padding-top: 60px;
    border-top: 1px solid var(--border-subtle);
}

.tech-stack-section h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 40px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.tech-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.tech-category {
    padding: 30px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
    transition: all 0.3s ease;
}

.tech-category:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.tech-category h4 {
    color: var(--accent-primary);
    margin-bottom: 15px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.tech-category p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    border-top: 1px solid var(--border-subtle);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info {
    text-align: center;
    margin-bottom: 60px;
}

.contact-info h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.contact-info p {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: 40px;
    line-height: 1.8;
    font-family: 'Inter', sans-serif;
}

.contact-details {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-item a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: #0d8f6f;
    text-decoration: underline;
}

.contact-icon {
    font-size: 1.2rem;
}

/* Contact Form */
.contact-form {
    background: transparent;
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.contact-form h3 {
    color: var(--text-primary);
    margin-bottom: 30px;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: border-color 0.3s ease;
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #10a37f;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.contact-form .btn-primary {
    width: 100%;
    background: #10a37f;
    color: #000000;
    margin-top: 20px;
}

.contact-form .btn-primary:hover {
    background: transparent;
    color: var(--accent-primary);
    border: 1px solid #10a37f;
}

/* Footer */
footer {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 60px 0 20px;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo h3 {
    color: var(--accent-primary);
    margin-bottom: 15px;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.footer-logo p {
    opacity: 0.6;
    line-height: 1.8;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.footer-section h4 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: 20px;
    text-align: center;
    opacity: 0.6;
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        gap: 0;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 999;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--border-subtle);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: 15px 0;
        font-size: 1rem;
    }

    .nav-menu .cta-btn {
        margin-top: 10px;
        text-align: center;
        padding: 12px 20px;
    }

    .theme-toggle {
        margin-left: 0;
    }

    .container {
        padding: 0 20px;
    }

    .nav-container {
        padding: 0 20px;
    }

    .hero-container {
        padding: 0 20px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

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

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

    .about-features {
        grid-template-columns: 1fr;
    }

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

    .story-results {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .contact-form {
        padding: 30px 20px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-content p {
        font-size: 0.9rem;
    }

    .services h2,
    .about-text h2,
    .contact-info h2 {
        font-size: 1.5rem;
    }

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