/* -------------------------------------
   Header & Navigation
------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

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

.nav-links {
    display: flex;
    gap: var(--space-md);
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    font-size: 0.95rem;
}

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

/* Hamburger Menu */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin-bottom: 5px;
    transition: all var(--transition-fast);
}

.hamburger span:last-child {
    margin-bottom: 0;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

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


/* -------------------------------------
   Hero Section
------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    /* Offset for header */
    position: relative;
    overflow: hidden;
}

/* Background Glow Effect */
.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(15, 23, 42, 0) 70%);
    z-index: 0;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-sm);
    line-height: 1.1;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

.scroll-indicator svg {
    width: 20px;
    height: 20px;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0) translateX(-50%);
    }

    40% {
        transform: translateY(-10px) translateX(-50%);
    }

    60% {
        transform: translateY(-5px) translateX(-50%);
    }
}

/* -------------------------------------
   Footer
------------------------------------- */
.footer {
    background-color: var(--bg-surface);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: var(--space-xl) 0 var(--space-lg);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.footer-socials {
    display: flex;
    gap: var(--space-sm);
}

.footer-socials a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-socials a:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.footer-socials svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: var(--space-md);
}

/* -------------------------------------
   About & Expertise Section
------------------------------------- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
    margin-bottom: var(--space-xl);
}

.about-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4/5;
    background-color: var(--bg-surface);
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
}

.about-content h3 {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
    color: var(--accent-primary);
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
}

/* Expertise Cards */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-md);
}

.expertise-card {
    background-color: var(--bg-surface);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.expertise-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card), 0 10px 30px -10px rgba(99, 102, 241, 0.3);
    border-color: rgba(99, 102, 241, 0.3);
}

.expertise-icon {
    width: 50px;
    height: 50px;
    background-color: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: var(--accent-primary);
}

.expertise-icon svg {
    width: 24px;
    height: 24px;
}

.expertise-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.expertise-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* -------------------------------------
   Skills Section
------------------------------------- */
.skills-container {
    max-width: 800px;
    margin: 0 auto;
}

.skill-category {
    margin-bottom: var(--space-md);
}

.skill-category-title {
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background-color: var(--bg-surface);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-color: rgba(99, 102, 241, 0.3);
}

/* -------------------------------------
   Projects / Portfolio Section
------------------------------------- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background-color: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-image {
    aspect-ratio: 16/10;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-surface-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: var(--space-md);
}

.project-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tags span {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

/* -------------------------------------
   Process Section
------------------------------------- */
.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.process-step {
    background-color: var(--bg-surface);
    padding: var(--space-lg) var(--space-md) var(--space-md);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
}

.process-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background-color: var(--accent-primary);
    color: var(--text-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.25rem;
    box-shadow: var(--shadow-card);
}

.process-step h4 {
    margin-top: var(--space-xs);
    margin-bottom: var(--space-xs);
    font-size: 1.125rem;
}

.process-step p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* -------------------------------------
   Requirements Section
------------------------------------- */
.requirements-box {
    background-color: rgba(99, 102, 241, 0.05);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.requirements-box h3 {
    text-align: center;
    margin-bottom: var(--space-md);
    font-size: 1.5rem;
}

.requirements-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: var(--space-md);
}

.requirements-list li:last-child {
    margin-bottom: 0;
}

.requirements-icon {
    flex-shrink: 0;
    color: var(--accent-secondary);
}

.requirements-text strong {
    display: block;
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.requirements-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* -------------------------------------
   Animations & Interaction (Phase 5)
------------------------------------- */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* -------------------------------------
   Responsive Phase 2, 3, 4
------------------------------------- */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--bg-surface);
        flex-direction: column;
        align-items: center;
        padding: var(--space-lg) 0;
        gap: var(--space-lg);
        transform: translateY(-150%);
        transition: transform var(--transition-normal);
        opacity: 0;
        pointer-events: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        box-shadow: var(--shadow-card);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
}