/* ===== CSS Variables ===== */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-secondary: #0ea5e9;
    --color-dark: #0f172a;
    --color-gray-900: #1e293b;
    --color-gray-700: #334155;
    --color-gray-500: #64748b;
    --color-gray-300: #cbd5e1;
    --color-gray-100: #f1f5f9;
    --color-white: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.3s ease;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
}

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

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

.btn-large {
    padding: 16px 36px;
    font-size: 1.1rem;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-100);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--color-gray-700);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
}

.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(99, 102, 241, 0.7));
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 700px;
    padding-top: 72px;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-content p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    line-height: 1.7;
}

/* ===== About Section ===== */
.about {
    padding: 120px 0;
    background: var(--color-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-image {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-content h2 {
    font-size: 2.5rem;
    color: var(--color-dark);
    margin-bottom: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.about-content p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--color-gray-500);
}

.stats {
    display: flex;
    gap: 48px;
    margin-top: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 8px;
}

/* ===== Projects Section ===== */
.projects {
    padding: 120px 0;
    background: var(--color-gray-100);
}

.projects h2 {
    font-size: 2.5rem;
    color: var(--color-dark);
    text-align: center;
    margin-bottom: 12px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--color-gray-500);
    font-size: 1.1rem;
    margin-bottom: 60px;
}

.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.project-card {
    background: var(--color-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 28px;
}

.project-content h3 {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 12px;
    font-weight: 600;
}

.project-content p {
    color: var(--color-gray-500);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== Values Section ===== */
.values {
    padding: 120px 0;
    background: var(--color-white);
}

.values h2 {
    font-size: 2.5rem;
    color: var(--color-dark);
    text-align: center;
    margin-bottom: 60px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.value-card {
    text-align: center;
    padding: 40px 32px;
    border-radius: 16px;
    background: var(--color-gray-100);
    transition: var(--transition);
}

.value-card:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
}

.value-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--color-white);
}

.value-card h3 {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 12px;
    font-weight: 600;
}

.value-card p {
    color: var(--color-gray-500);
    font-size: 0.95rem;
}

/* ===== Contact Section ===== */
.contact {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--color-dark), var(--color-gray-900));
}

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

.contact h2 {
    font-size: 2.5rem;
    color: var(--color-white);
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.contact p {
    color: var(--color-gray-300);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    background: var(--color-dark);
    border-top: 1px solid var(--color-gray-700);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer .logo {
    color: var(--color-white);
    font-size: 1.25rem;
}

.footer p {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-image {
        order: -1;
    }

    .stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--color-gray-100);
        box-shadow: var(--shadow-lg);
    }

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

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

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

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

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

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

    .hero-content p {
        font-size: 1rem;
    }

    .about,
    .projects,
    .values,
    .contact {
        padding: 80px 0;
    }

    .about-content h2,
    .projects h2,
    .values h2,
    .contact h2 {
        font-size: 2rem;
    }

    .stats {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }

    .stat {
        align-items: center;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .btn-large {
        padding: 14px 28px;
        font-size: 1rem;
    }
}

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

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

.project-card,
.value-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.project-card:nth-child(1),
.value-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2),
.value-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3),
.value-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }