/* Breakpoints */
/* Mobile: < 768px */
/* Tablet: 768px - 1024px */
/* Desktop: > 1024px */

/* Mobile First */
@media (max-width: 768px) {
    body {
        padding-top: 80px;
    }

    .nav {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .logo {
        height: 45px;
        display: flex;
        align-items: center;
    }
    .logo img {
        height: 100%;
        max-height: 100%;
        width: auto;
        object-fit: contain;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--color-white);
        flex-direction: column;
        padding: 80px var(--spacing-lg);
        transition: var(--transition-smooth);
        box-shadow: var(--shadow-lg);
        z-index: 1000;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        margin: var(--spacing-md) 0;
    }

    .nav-links a {
        font-size: 1.2rem;
    }

    .hero {
        min-height: 500px;
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero h2 {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

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

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

    .about-image {
        height: 300px;
    }

    .skill-card, .publication-card {
        padding: var(--spacing-lg);
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-content {
        margin-left: 40px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .footer-logo {
        height: 70px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    body {
        padding-top: 70px;
    }

    .logo {
        height: 38px;
        display: flex;
        align-items: center;
    }
    .logo img {
        height: 100%;
        max-height: 100%;
        width: auto;
        object-fit: contain;
    }

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

    .hero h2 {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .cta-button {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    .skill-icon {
        width: 60px;
        height: 60px;
    }

    .about-image {
        height: 250px;
    }
}

/* Tablet */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 720px;
    }

    .logo {
        height: 80px;
    }

    .hero {
        min-height: 550px;
    }

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

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

/* Desktop */
@media (min-width: 1025px) {
    .container {
        max-width: 1200px;
    }

    .logo {
        height: 90px;
    }

    .hero {
        min-height: 600px;
    }
}

/* Large Screens */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    h1 {
        font-size: 4rem;
    }

    h2 {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }
}

/* Extra Large Screens */
@media (min-width: 1920px) {
    .container {
        max-width: 1600px;
    }

    html {
        font-size: 18px;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .cta-button,
    .menu-toggle {
        display: none;
    }

    body {
        padding-top: 0;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    section {
        page-break-inside: avoid;
    }

    a {
        text-decoration: none;
        color: var(--color-dark);
    }
}