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

:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --dark: #1e293b;
    --gray: #64748b;
    --light-gray: #f1f5f9;
    --white: #ffffff;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
    cursor: pointer;
    text-decoration: none;
}

.logo-accent {
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
}

/* Content Section */
.content {
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.founder-section {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 3rem;
    align-items: start;
    margin-bottom: 4rem;
}

.founder-photo {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    border: 4px solid white;
}

.founder-info h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.founder-title {
    font-size: 1.1rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.credentials {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.credential-badge {
    background: var(--light-gray);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--dark);
    font-weight: 500;
}

.founder-bio {
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.8;
}

.founder-bio p {
    margin-bottom: 1rem;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.social-link {
    text-decoration: none;
    color: var(--primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Story Section */
.story-section {
    background: var(--light-gray);
    padding: 3rem;
    border-radius: 12px;
    margin-bottom: 3rem;
}

.story-section h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

.story-section h3 {
    font-size: 1.3rem;
    color: var(--primary);
    margin: 2rem 0 1rem;
    font-weight: 600;
}

.story-section p {
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.story-section ul {
    list-style: none;
    padding: 0;
}

.story-section li {
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.story-section li::before {
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* Research Section */
.research-section {
    margin-bottom: 3rem;
}

.research-section h2 {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.research-section h3 {
    font-size: 1.2rem;
    color: var(--primary);
    margin: 1.5rem 0 0.75rem;
    font-weight: 600;
}

.research-section p {
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
    color: white;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 2rem;
}

.cta-section .btn {
    background: white;
    color: var(--primary);
    font-size: 1.1rem;
    padding: 1rem 2rem;
}

.cta-section .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
}

.footer p {
    opacity: 0.8;
}

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

/* Hamburger Menu Styles */
.hamburger-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger-menu span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 3px;
    transition: all 0.3s;
}

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

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

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    .founder-section {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .founder-photo {
        margin: 0 auto 2rem;
        width: 200px;
        height: 200px;
    }

    .credentials {
        justify-content: center;
    }

    .story-section,
    .cta-section {
        padding: 2rem 1.5rem;
    }

    .content {
        padding: 3rem 1.5rem;
    }

    .nav-container {
        padding: 0 1rem;
    }
}

/* Mobile phones (480px) */
@media (max-width: 480px) {
    /* Hamburger menu display */
    .hamburger-menu {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        gap: 1rem;
        z-index: 999;
        display: none;
    }

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

    .nav-links a,
    .nav-links .btn {
        width: 100%;
        text-align: center;
    }

    /* Typography - smaller */
    .hero h1 {
        font-size: 1.75rem;
        line-height: 1.3;
    }

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

    .hero {
        padding: 5rem 1rem 2.5rem;
    }

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

    .founder-title {
        font-size: 1rem;
    }

    .founder-photo {
        width: 180px;
        height: 180px;
    }

    .credential-badge {
        font-size: 0.85rem;
        padding: 0.4rem 0.85rem;
    }

    .story-section h2,
    .research-section h2,
    .cta-section h2 {
        font-size: 1.5rem;
    }

    .story-section h3,
    .research-section h3 {
        font-size: 1.15rem;
    }

    .story-section,
    .cta-section {
        padding: 1.5rem 1rem;
    }

    .content {
        padding: 2rem 1rem;
    }

    .founder-bio,
    .story-section p,
    .research-section p {
        font-size: 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.9rem;
    }
}

/* Small phones (360px) */
@media (max-width: 360px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .logo {
        font-size: 1.1rem;
    }

    .founder-photo {
        width: 150px;
        height: 150px;
    }

    .credential-badge {
        font-size: 0.8rem;
        padding: 0.35rem 0.75rem;
    }
}

/* ============================================================
   Dark Mode Overrides
   Activated when <html> has .dark-mode class (set by dark-mode-init.js)
   ============================================================ */

.dark-mode body {
    background: #1a1a2e;
    color: #e2e8f0;
}

.dark-mode .navbar {
    background: rgba(26, 26, 46, 0.98);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.dark-mode .logo {
    color: #e2e8f0;
}

.dark-mode .nav-links a {
    color: #e2e8f0;
}

.dark-mode .nav-links a:hover {
    color: #63b3ed;
}

.dark-mode .hamburger-menu span {
    background: #e2e8f0;
}

.dark-mode .content {
    color: #e2e8f0;
}

.dark-mode .founder-info h2 {
    color: #e2e8f0;
}

.dark-mode .credential-badge {
    background: #2d3748;
    color: #e2e8f0;
}

.dark-mode .founder-bio {
    color: #a0aec0;
}

.dark-mode .story-section {
    background: #16213e;
}

.dark-mode .story-section h2 {
    color: #e2e8f0;
}

.dark-mode .story-section p {
    color: #a0aec0;
}

.dark-mode .story-section li {
    color: #a0aec0;
}

.dark-mode .research-section h2 {
    color: #e2e8f0;
}

.dark-mode .research-section p {
    color: #a0aec0;
}

.dark-mode .research-section ul {
    color: #a0aec0;
}

.dark-mode .research-section a {
    color: #63b3ed;
}

.dark-mode .footer {
    background: #0f172a;
}

.dark-mode .founder-photo {
    border-color: #2d3748;
}

@media (max-width: 480px) {
    .dark-mode .nav-links {
        background: #1a1a2e;
    }
}