/* ============================================
   RESPONSIVE DESIGN
   Mobile-first approach with breakpoints
   ============================================ */

/* ============================================
   TABLET (641px - 1024px)
   ============================================ */

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

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

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

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

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

    .nav-menu {
        gap: var(--spacing-xl);
    }

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

    .projects-preview {
        grid-template-columns: 1fr;
    }

    .certifications-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }

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

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

/* ============================================
   MOBILE (320px - 640px)
   ============================================ */

@media (max-width: 640px) {
    :root {
        font-size: 14px;
    }

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

    /* Navigation */
    .navbar .container {
        padding: var(--spacing-md) var(--spacing-md);
        height: 60px;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(250, 250, 250, 0.95);
        backdrop-filter: blur(10px);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

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

    .hamburger {
        display: flex;
    }

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

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

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

    /* Hero Section */
    .hero {
        padding: var(--spacing-2xl) 0;
    }

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

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

    .hero-description {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-lg);
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    /* Stats */
    .stats {
        padding: var(--spacing-2xl) 0;
    }

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

    .stat-card {
        padding: var(--spacing-lg);
    }

    .stat-number {
        font-size: 2rem;
    }

    .stat-label {
        font-size: 0.9rem;
    }

    /* Sections */
    section {
        padding: var(--spacing-2xl) 0;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-lg);
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: var(--spacing-lg);
    }

    /* Expertise */
    .expertise-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .expertise-card {
        padding: var(--spacing-lg);
    }

    .expertise-icon {
        font-size: 2rem;
        margin-bottom: var(--spacing-md);
    }

    .expertise-card h3 {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-sm);
    }

    .expertise-card p {
        font-size: 0.95rem;
    }

    /* Projects */
    .projects-preview {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        margin-bottom: var(--spacing-2xl);
    }

    .project-preview-card {
        padding: var(--spacing-lg);
    }

    .project-preview-card h3 {
        font-size: 1.25rem;
        margin-bottom: var(--spacing-md);
    }

    .project-preview-card p {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-md);
    }

    /* Certifications */
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-2xl);
    }

    .cert-badge {
        padding: var(--spacing-md);
        font-size: 0.85rem;
    }

    /* CTA */
    .cta-section {
        padding: var(--spacing-2xl) 0;
    }

    .cta-section h2 {
        font-size: 1.5rem;
        margin-bottom: var(--spacing-md);
    }

    .cta-section p {
        font-size: 0.95rem;
        margin-bottom: var(--spacing-lg);
    }

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

    .footer-section h4 {
        font-size: 1rem;
    }

    .footer-section p,
    .footer-section a {
        font-size: 0.9rem;
    }

    .footer-bottom {
        font-size: 0.85rem;
    }
}

/* ============================================
   EXTRA SMALL (320px - 480px)
   ============================================ */

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

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.35rem;
    }

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

    .stat-number {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.85rem;
    }

    .expertise-icon {
        font-size: 1.75rem;
    }

    .expertise-card h3 {
        font-size: 1rem;
    }

    .project-preview-card h3 {
        font-size: 1.1rem;
    }

    .cta-section h2 {
        font-size: 1.35rem;
    }

    .nav-link {
        font-size: 0.9rem;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .navbar,
    .hero-cta,
    .cta-section,
    .footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .section-title {
        page-break-after: avoid;
    }

    .expertise-card,
    .project-preview-card,
    .stat-card {
        page-break-inside: avoid;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-white: #111827;
        --color-slate: #E5E7EB;
        --color-slate-light: #D1D5DB;
        --color-slate-dark: #F9FAFB;
        --color-gray-dark: #9CA3AF;
    }

    body {
        background-color: #111827;
        color: #E5E7EB;
    }

    .navbar {
        background: rgba(17, 24, 39, 0.8);
    }

    .stat-card,
    .expertise-card,
    .project-preview-card,
    .cert-badge {
        background: rgba(31, 41, 55, 0.7);
        border-color: rgba(255, 255, 255, 0.1);
    }

    .hero {
        background: linear-gradient(135deg, rgba(17, 24, 39, 0.5) 0%, rgba(8, 145, 178, 0.1) 100%);
    }

    .expertise {
        background: linear-gradient(135deg, rgba(17, 24, 39, 0.5) 0%, rgba(8, 145, 178, 0.05) 100%);
    }

    .certifications-highlight {
        background: linear-gradient(135deg, rgba(17, 24, 39, 0.5) 0%, rgba(8, 145, 178, 0.05) 100%);
    }
}