/* ===== CSS Variables / Design System ===== */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-bg-card: rgba(26, 26, 36, 0.6);
    --color-bg-card-hover: rgba(26, 26, 36, 0.9);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6b6b7b;
    
    --color-accent: #00d4ff;
    --color-accent-secondary: #7c3aed;
    --color-accent-glow: rgba(0, 212, 255, 0.3);
    
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    --gradient-hero: radial-gradient(ellipse at 50% 0%, rgba(0, 212, 255, 0.15) 0%, transparent 50%);
    --gradient-card: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, transparent 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 64px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);
    
    /* Borders */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 32px;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-max: 1200px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 auto;
}

/* ===== Text Utilities ===== */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header .section-description {
    margin: 0 auto;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent);
}

.btn-full {
    width: 100%;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.header.scrolled {
    padding: 12px 0;
    background: rgba(10, 10, 15, 0.95);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    position: relative;
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition-fast);
}

.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 0px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1.125rem;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-image-wrapper {
    position: relative;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    overflow: hidden;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-image-glow {
    position: absolute;
    inset: -20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    opacity: 0.3;
    filter: blur(40px);
    z-index: -1;
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    animation: float 6s ease-in-out infinite;
}

.floating-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(32, 48, 53, 0.5);
}

.floating-card .card-icon {
    font-size: 1.5rem;
}

.card-1 {
    top: 20%;
    left: -20px;
    animation-delay: 0s;
}

.card-2 {
    bottom: 20%;
    right: -20px;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    position: relative;
}

.scroll-arrow::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { top: 8px; opacity: 1; }
    50% { top: 20px; opacity: 0.3; }
}

/* ===== Projects Section ===== */
.projects {
    padding: var(--section-padding);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(0, 212, 255, 0.1);
}

.project-image {
    position: relative;
    height: 260px;
    overflow: hidden;
}

.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-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    padding: 12px 24px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.project-card:hover .project-link {
    transform: translateY(0);
}

.project-info {
    padding: 24px;
}

.project-category {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-title {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 600;
    margin: 8px 0;
}

.project-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tags span {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* ===== About Section ===== */
.about {
    padding: var(--section-padding);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
    align-items: start;
}

.about-image {
    position: relative;
}

.about-image-wrapper {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.about-image-wrapper img {
    width: 100%;
    aspect-ratio: 4/5;
    object-fit: cover;
}

.about-image-border {
    position: absolute;
    inset: -8px;
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius-lg);
    opacity: 0.3;
    z-index: -1;
    transform: translate(16px, 16px);
}

.experience-badge {
    position: absolute;
    bottom: -30px;
    right: -30px;
    width: 140px;
    height: 140px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    box-shadow: var(--shadow-glow);
}

.exp-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
}

.exp-text {
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.3;
}

.about-description {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: 20px;
}

.skills-section,
.education-section {
    margin-top: 32px;
}

.skills-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
}

.skill-item:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.skill-icon {
    font-size: 1.5rem;
}

.skill-item span {
    font-size: 0.875rem;
    font-weight: 500;
}

.education-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
}

.edu-icon {
    font-size: 2rem;
}

.education-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.education-item p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ===== Testimonials Section ===== */
.testimonials {
    padding: var(--section-padding);
    background: var(--color-bg-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    position: relative;
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.testimonial-card:hover {
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-4px);
}

.testimonial-quote {
    font-family: var(--font-display);
    font-size: 4rem;
    line-height: 1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.5;
}

.testimonial-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-size: 1rem;
    font-weight: 600;
}

.author-role {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.testimonial-rating {
    position: absolute;
    top: 32px;
    right: 32px;
    color: #fbbf24;
    font-size: 0.875rem;
    letter-spacing: 2px;
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--section-padding);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-description {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1.25rem;
}

.contact-item h4 {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.contact-item a,
.contact-item p {
    font-size: 1rem;
    color: var(--color-text-primary);
}

.contact-item a:hover {
    color: var(--color-accent);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-4px);
}

.contact-form {
    padding: 40px;
    background: var(--color-bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 32px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero-description {
        margin: 0 auto 32px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .floating-card {
        display: none;
    }
    
    .hero-image-wrapper {
        width: 300px;
        height: 300px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--color-bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        transition: right var(--transition-normal);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-link {
        font-size: 1.5rem;
    }
    
    .mobile-menu-btn {
        display: block;
        z-index: 1001;
    }
    
    .mobile-menu-btn.active .hamburger {
        background: transparent;
    }
    
    .mobile-menu-btn.active .hamburger::before {
        top: 0;
        transform: rotate(45deg);
    }
    
    .mobile-menu-btn.active .hamburger::after {
        bottom: 0;
        transform: rotate(-45deg);
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links {
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .hero-image-wrapper {
        width: 250px;
        height: 250px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .experience-badge {
        width: 100px;
        height: 100px;
        bottom: -20px;
        right: -10px;
    }
    
    .exp-number {
        font-size: 1.75rem;
    }
    
    .contact-form {
        padding: 24px;
    }
}