/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 8px;
    background: linear-gradient(315deg, #9a3412 0%, #0c1e3d 50%, #020617 100%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    width: 100vw;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0%; }
    50% { background-position: 100%; }
}

.header-left h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(90deg, #60a5fa, #fb923c, #60a5fa);
    background-size: 200%;
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0;
    padding-top: 4px;
    animation: gradientShift 4s ease-in-out;
}

.header-left h1 a {
    background: inherit;
    background-clip: inherit;
    -webkit-background-clip: inherit;
    -webkit-text-fill-color: inherit;
    text-decoration: none;
    color: inherit;
}

/* Navigation */
.nav-menu {
    display: flex;
    gap: var(--spacing);
    align-items: center;
    padding-top: 4px;
    margin-right: 2px;
}

.nav-link {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 4px var(--spacing);
    color: var(--white);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

/* Only apply hover effects on devices that can hover (not touch screens) */
@media (hover: hover) and (pointer: fine) {
    .nav-link:hover {
        background: rgba(59, 130, 246, 0.15);
        border-color: rgba(59, 130, 246, 0.3);
        color: var(--accent);
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
    }
}

.nav-link:focus {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
    outline: none;
}

.nav-link.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2);
}

/* Touch feedback for mobile devices */
.nav-link.touch-active {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
}

/* Only apply hover effects on devices that can hover (not touch screens) */
@media (hover: hover) and (pointer: fine) {
    .nav-link.active:hover {
        box-shadow: 0 0 20px rgba(59, 130, 246, 0.4), 0 4px 15px rgba(59, 130, 246, 0.2);
    }
}

/* Project Cards */
.project-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: var(--spacing);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    opacity: 1;
    transform: translateY(0);
}

/* Scroll-based highlighting for mobile */
.project-card.scroll-highlighted {
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.25);
    border-color: rgba(59, 130, 246, 0.6);
    background: rgba(255, 255, 255, 0.08);
}

.project-card.scroll-highlighted::before {
    opacity: 1;
}

.project-card.scroll-highlighted .project-status {
    background: #ea580c;
    box-shadow: 0 0 8px rgba(234, 88, 12, 0.6);
}

.project-card.scroll-highlighted .project-description {
    color: rgba(255, 255, 255, 0.9);
}

.project-card.scroll-highlighted .tech-tag {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.4);
    color: var(--accent);
}

.project-card.scroll-highlighted .project-icon {
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.project-card.scroll-highlighted .project-preview {
    border-color: rgba(59, 130, 246, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.project-card.scroll-highlighted .project-preview img {
    opacity: 1;
}

.project-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, rgba(59, 130, 246, 0.3), rgba(234, 88, 12, 0.3));
    border-radius: 18px;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: -1;
}

/* Desktop hover effects - disabled on mobile screens */
@media (hover: hover) and (pointer: fine) and (min-width: 521px) {
    .project-card:hover,
    .project-card:focus-within,
    .project-card:active,
    .project-card:focus {
        box-shadow: 0 8px 25px rgba(59, 130, 246, 0.25);
        border-color: rgba(59, 130, 246, 0.6);
        background: rgba(255, 255, 255, 0.08);
    }

    .project-card:hover::before,
    .project-card:focus-within::before,
    .project-card:active::before,
    .project-card:focus::before {
        opacity: 1;
    }

    .project-card:hover .project-status,
    .project-card:focus-within .project-status,
    .project-card:active .project-status,
    .project-card:focus .project-status {
        background: #ea580c;
        box-shadow: 0 0 8px rgba(234, 88, 12, 0.6);
    }

    .project-card:hover .project-description,
    .project-card:focus-within .project-description,
    .project-card:active .project-description,
    .project-card:focus .project-description {
        color: rgba(255, 255, 255, 0.9);
    }

    .project-card:hover .tech-tag,
    .project-card:focus-within .tech-tag,
    .project-card:active .tech-tag,
    .project-card:focus .tech-tag {
        background: rgba(59, 130, 246, 0.2);
        border-color: rgba(59, 130, 246, 0.4);
        color: var(--accent);
    }

    .project-card:hover .project-icon,
    .project-card:focus-within .project-icon,
    .project-card:active .project-icon,
    .project-card:focus .project-icon {
        box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    }

    .project-card:hover .project-preview img,
    .project-card:focus-within .project-preview img,
    .project-card:active .project-preview img,
    .project-card:focus .project-preview img {
        opacity: 1;
    }

    .project-card:hover .project-preview,
    .project-card:focus-within .project-preview,
    .project-card:active .project-preview,
    .project-card:focus .project-preview {
        border-color: rgba(59, 130, 246, 0.3);
        background: rgba(255, 255, 255, 0.08);
    }
}

.project-header {
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
    margin-bottom: calc(2 * var(--spacing));
    position: relative;
}

.project-number {
    font-size: 0.875rem;
    color: var(--accent);
    font-weight: 600;
    background: rgba(59, 130, 246, 0.1);
    padding: 8px var(--spacing);
    border-radius: var(--spacing);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.project-status {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: var(--spacing);
    height: var(--spacing);
    background: #2563eb;
    border-radius: 50%;
    box-shadow: 0 0 var(--spacing) rgba(37, 99, 235, 0.5);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: calc(1.5 * var(--spacing));
    margin-bottom: calc(0.5 * var(--spacing));
    padding-top: 1px;
    color: var(--white);
}

.project-description {
    color: #94a3b8;
    margin-bottom: calc(2.5 * var(--spacing));
    font-size: 0.95rem;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing);
    margin-bottom: calc(1.5 * var(--spacing));
}

.tech-tag {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: #fb923c;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 500;
}

.project-footer {
    color: var(--white);
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
    margin-top: auto;
}

.project-links {
    display: flex;
    gap: var(--spacing);
}

.project-link {
    padding: 8px var(--spacing);
    border-radius: var(--spacing);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

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

.project-link.primary:hover,
.project-link.primary:focus {
    background: var(--secondary);
    outline: none;
}

.project-link.secondary {
    color: var(--gray);
    border-color: rgba(255, 255, 255, 0.1);
}

.project-link.secondary:hover,
.project-link.secondary:focus {
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.2);
    outline: none;
}

.project-link.disabled {
    background: rgba(100, 116, 139, 0.3);
    color: #64748b;
    border-color: rgba(100, 116, 139, 0.2);
    cursor: not-allowed;
    opacity: 0.6;
}

.project-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #1e3a8a, #ea580c);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 600;
    margin-top: 6px;
}

.project-preview {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 180px;
    height: 110px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all 0.2s ease;
}

.project-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    loading: lazy;
}

/* Animation delays removed to prevent mobile bounce */

/* Responsive Design */
@media (max-width: 768px) {
    .project-title {
        font-size: 1.3rem;
    }
    
    .project-description {
        font-size: 0.9rem;
    }
}

@media (max-width: 520px) {
    body {
        padding-top: 80px;
        padding-bottom: 100px; /* Extra padding for last card scroll highlighting */
    }

    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 20px; /* Increased gap for better scroll highlighting */
        margin-bottom: 60px; /* Additional margin at bottom of grid */
    }

    .header-left h1 {
        font-size: 1.3rem;
    }

    .project-title {
        font-size: 1.2rem;
    }

    .header {
        padding: 4px 0;
    }

    .header-content {
        flex-direction: column;
        gap: 0px;
        align-items: center;
    }

    .nav-menu {
        justify-content: center;
        flex-wrap: wrap;
    }

    .project-preview {
        position: absolute;
        top: 8px;
        right: 8px;
        width: 180px;
        height: 110px;
        margin-bottom: 0;
    }

    /* Disable hover effects on small screens */
    .project-card:hover:not(.scroll-highlighted) {
        box-shadow: 0 4px 15px rgba(59, 130, 246, 0.1) !important;
        border-color: rgba(255, 255, 255, 0.1) !important;
        background: rgba(255, 255, 255, 0.05) !important;
    }
}

html {
    scroll-behavior: smooth;
}

.project-card:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}