/**
 * Mobile Responsive Enhancements
 * Touch-friendly, accessible, and optimized for mobile devices
 */

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

/* Visually hidden but accessible to screen readers */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus indicators for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Skip to main content link (appears on tab) */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: 1em;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    text-decoration: none;
}

.skip-to-main:focus {
    left: 50%;
    transform: translateX(-50%);
    top: 1em;
}

/* ===== FORM VALIDATION STYLES ===== */

.form-message {
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.6;
    animation: slideDown 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 10;
}

.form-message-success {
    background: linear-gradient(135deg, rgba(94, 255, 161, 0.2), rgba(0, 234, 255, 0.15));
    border: 2px solid rgba(94, 255, 161, 0.6);
    color: #5effa1;
    text-shadow: 0 0 10px rgba(94, 255, 161, 0.3);
}

.form-message-error {
    background: linear-gradient(135deg, rgba(255, 94, 94, 0.2), rgba(255, 161, 94, 0.15));
    border: 2px solid rgba(255, 94, 94, 0.6);
    color: #ff9494;
    text-shadow: 0 0 10px rgba(255, 94, 94, 0.3);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-error {
    display: block;
    color: #ff5e5e;
    font-size: 0.75rem;
    margin-top: 0.25rem;
    min-height: 1rem;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

input.error,
textarea.error {
    border-color: #ff5e5e !important;
    box-shadow: 0 0 0 1px rgba(255, 94, 94, 0.3) !important;
}

input.success,
textarea.success {
    border-color: var(--secondary-color) !important;
    box-shadow: 0 0 0 1px rgba(94, 255, 161, 0.3) !important;
}

/* ===== MOBILE TOUCH OPTIMIZATIONS ===== */

/* Minimum touch target size: 44x44px (WCAG AAA) */
@media (max-width: 768px) {
    
    /* Buttons - Larger touch targets */
    .btn,
    .contact-btn,
    .project-link,
    .nav-link {
        min-height: 44px;
        min-width: 44px;
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .btn i {
        margin-left: 0.5rem;
    }
    
    /* Hero buttons */
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* Form inputs - Full width and touch-friendly */
    .contact-form input,
    .contact-form textarea {
        width: 100%;
        min-height: 48px;
        padding: 0.875rem 1rem;
        font-size: 16px; /* Prevents iOS zoom on focus */
        -webkit-appearance: none;
        appearance: none;
    }
    
    .contact-form textarea {
        min-height: 120px;
        resize: vertical;
    }
    
    .form-row {
        flex-direction: column;
        gap: 1rem;
    }
    
    .form-row .form-group {
        width: 100%;
    }
    
    /* Submit button */
    .contact-form button[type="submit"] {
        width: 100%;
        min-height: 50px;
        font-size: 1rem;
    }
    
    /* Skills - Single column stack */
    .skill-grid {
        grid-template-columns: 1fr !important;
        gap: 0.75rem;
    }
    
    .skill-item {
        padding: 0.875rem 1rem;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
    
    /* Project cards - Optimized spacing */
    .project-card {
        margin-bottom: 1.5rem;
    }
    
    .project-image {
        height: 200px;
    }
    
    .project-content {
        padding: 1.25rem;
    }
    
    .project-links {
        gap: 1rem;
    }
    
    .project-link {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    /* Contact cards */
    .contact-info {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .contact-card {
        padding: 1.5rem;
    }
    
    /* Footer */
    .footer__container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .footer__links {
        justify-content: center;
    }
    
    /* Hero section */
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-text {
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .profile-img {
        width: 150px;
        height: 150px;
    }
    
    /* Section spacing */
    section {
        padding: 3rem 1rem;
    }
    
    .section-header {
        margin-bottom: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    /* About section */
    .about-content {
        padding: 0;
    }
    
    .about-text p {
        font-size: 0.95rem;
        line-height: 1.7;
    }
}

/* ===== SMALL MOBILE (< 480px) ===== */
@media (max-width: 480px) {
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
    }
    
    .profile-img {
        width: 120px;
        height: 120px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.85rem;
    }
    
    .project-title {
        font-size: 1.25rem;
    }
    
    .tech-tag {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }
}

/* ===== TABLET LANDSCAPE (768px - 1024px) ===== */
@media (min-width: 768px) and (max-width: 1024px) {
    
    .skill-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-info {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-row {
        gap: 1.5rem;
    }
}

/* ===== PARTICLE BACKGROUND MOBILE OPTIMIZATION ===== */
@media (max-width: 768px) {
    
    /* Reduce particle density on mobile for performance */
    .hero-particles {
        opacity: 0.3;
    }
    
    /* Disable animations on low-end devices */
    @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
        }
    }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
    
    .btn,
    .nav-link,
    .project-link {
        border: 2px solid currentColor;
    }
    
    .form-message {
        border-width: 2px;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    
    .navbar,
    .nav-toggle,
    .hero-particles,
    .fab-message,
    .contact-form {
        display: none !important;
    }
    
    .hero-content {
        flex-direction: row;
    }
    
    section {
        page-break-inside: avoid;
    }
}