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

:root {
    --primary: #1e40af;
    --primary-light: #3b82f6;
    --primary-dark: #1e3a8a;
    --accent: #0891b2;
    --dark: #0c1e35;
    --gray-900: #0f172a;
    --gray-800: #1e293b;
    --gray-700: #334155;
    --gray-600: #475569;
    --gray-500: #64748b;
    --gray-400: #94a3b8;
    --gray-300: #cbd5e1;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --gray-50: #f8fafc;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    color: var(--gray-700);
    line-height: 1.6;
    background: var(--white);
}

/* Navigation */
nav {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

nav.scrolled {
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.08);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo:hover {
    opacity: 0.8;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
    cursor: pointer;
}

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

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

.mobile-menu span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--gray-50) 0%, #e0f2fe 100%);
    padding: 10rem 2rem 6rem;
    text-align: center;
    margin-top: 73px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
    line-height: 1.1;
}

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

.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    box-shadow: 0 4px 6px rgba(30, 64, 175, 0.2);
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(30, 64, 175, 0.3);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: var(--gray-50);
}

/* Content Sections */
.section {
    display: none;
}

.section.active {
    display: block;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto;
}

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

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

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

/* Cards */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    padding: 2rem;
    transition: all 0.3s ease;
    border-radius: 8px;
}

.card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 8px 16px rgba(30, 64, 175, 0.1);
    transform: translateY(-4px);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.card h3 {
    color: var(--dark);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.stat-card {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 8px;
    color: var(--white);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--gray-700);
    line-height: 1.8;
}

.skills-list {
    list-style: none;
    padding: 0;
}

.skills-list li {
    padding: 0.75rem 0;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.2s ease;
}

.skills-list li:hover {
    padding-left: 0.5rem;
    color: var(--primary);
}

.skills-list li:last-child {
    border-bottom: none;
}

/* Founder Card */
.founder-card {
    max-width: 800px;
    margin: 5rem auto 0;
    background: linear-gradient(135deg, var(--gray-50) 0%, #e0f2fe 100%);
    padding: 3rem;
    text-align: center;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
}

.founder-card h3 {
    font-size: 1.875rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.founder-card .title {
    color: var(--gray-600);
    font-size: 1rem;
    margin-bottom: 2rem;
    font-weight: 500;
}

.founder-card p {
    text-align: left;
    color: var(--gray-700);
    line-height: 1.8;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.contact-item {
    padding: 2rem;
    background: linear-gradient(135deg, var(--gray-50) 0%, #e0f2fe 100%);
    text-align: center;
    border-radius: 8px;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(30, 64, 175, 0.1);
}

.contact-item-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.contact-item strong {
    display: block;
    color: var(--dark);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.contact-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* Footer */
footer {
    background: var(--dark);
    color: var(--gray-400);
    text-align: center;
    padding: 3rem 2rem;
    margin-top: 5rem;
    border-top: 1px solid var(--gray-800);
}

.footer-brand {
    margin-bottom: 1.5rem;
}

.footer-brand h3 {
    font-size: 1.75rem;
    color: var(--primary-light);
    font-weight: 700;
    letter-spacing: -0.025em;
}

footer p {
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

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

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

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

@media (max-width: 768px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--white);
        padding: 1.5rem;
        border-bottom: 1px solid var(--gray-200);
        gap: 0;
    }

    .nav-links li {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--gray-100);
    }

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

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

    .mobile-menu {
        display: flex;
    }

    .hero {
        padding: 6rem 1.5rem 4rem;
        margin-top: 65px;
    }

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

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

    .container {
        padding: 3rem 1.5rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .section-header p {
        font-size: 1rem;
    }

    .grid,
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

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

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

    .founder-card {
        padding: 2rem 1.5rem;
        margin-top: 3rem;
    }

    .card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.125rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.875rem 1.75rem;
        font-size: 0.875rem;
    }

    .footer-brand h3 {
        font-size: 1.5rem;
    }
}