/* CSS Variables & Design System */
:root {
    /* Dark Theme (Default) */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-dark: #0ea5e9;
    --accent-glow: rgba(56, 189, 248, 0.3);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --card-border: rgba(255, 255, 255, 0.05);
    --nav-bg: rgba(15, 23, 42, 0.9);

    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Sizes */
    --container-width: 1200px;
    --nav-height: 80px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #e2e8f0;
    --bg-tertiary: #cbd5e1;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #0ea5e9;
    --accent-dark: #0284c7;
    --accent-glow: rgba(14, 165, 233, 0.3);
    --gradient-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --card-border: rgba(0, 0, 0, 0.1);
    --nav-bg: rgba(248, 250, 252, 0.9);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

ul {
    list-style: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

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

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 0.95rem;
}

.btn i {
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: transparent;
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 25px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-outline {
    border-color: var(--accent);
    color: var(--accent);
    background: transparent;
}

.btn-outline:hover {
    background: var(--accent);
    color: var(--bg-primary);
    box-shadow: 0 0 25px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--card-border);
}

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

/* ============================================
   PARTICLES CANVAS
============================================ */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ============================================
   NAVIGATION
============================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--card-border);
    transition: var(--transition);
}

nav.scrolled {
    padding: 0.7rem 0;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.2);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-heading);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    position: relative;
    font-weight: 500;
    padding: 0.5rem 0;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: 50px;
    padding: 0.6rem 0.8rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.theme-toggle i {
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.theme-toggle .fa-sun {
    display: none;
    color: #fbbf24;
}

.theme-toggle .fa-moon {
    color: var(--accent);
}

[data-theme="light"] .theme-toggle .fa-sun {
    display: block;
}

[data-theme="light"] .theme-toggle .fa-moon {
    display: none;
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: 50px;
    overflow: hidden;
}

.lang-btn {
    background: transparent;
    border: none;
    padding: 0.5rem 0.8rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-body);
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
}

.lang-toggle:hover {
    border-color: var(--accent);
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(8.5px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
    transform: translateY(-8.5px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    transition: var(--transition);
}

.mobile-menu-overlay.active {
    opacity: 1;
}

/* ============================================
   HERO SECTION
============================================ */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text .greeting {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
}

.hero-text h2 {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.hero-text h2::after {
    display: none;
}

.hero-text p.role {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-weight: 500;
    min-height: 2.2rem;
}

/* Typing Cursor */
.cursor {
    animation: blink 1s infinite;
    color: var(--accent);
    font-weight: 300;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-text p.bio {
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
    max-width: 500px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.hero-image .img-wrapper {
    width: 380px;
    height: 380px;
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    overflow: hidden;
    position: relative;
    border: 3px solid var(--accent);
    box-shadow: 0 0 40px var(--accent-glow);
    animation: morph 8s ease-in-out infinite;
}

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

@keyframes morph {
    0% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
    25% { border-radius: 58% 42% 75% 25% / 76% 46% 54% 24%; }
    50% { border-radius: 50% 50% 33% 67% / 55% 27% 73% 45%; }
    75% { border-radius: 33% 67% 58% 42% / 63% 68% 32% 37%; }
    100% { border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%; }
}

/* ============================================
   REVEAL ANIMATIONS
============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay {
    transition-delay: 0.2s;
}

/* ============================================
   SKILLS SECTION
============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
}

.skill-card {
    background: var(--bg-secondary);
    padding: 2rem 1.5rem;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--card-border);
    cursor: default;
}

.skill-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3), 0 0 20px var(--accent-glow);
}

.skill-card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.skill-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.skill-card .skill-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ============================================
   EXPERIENCE / TIMELINE SECTION
============================================ */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--bg-secondary));
}

.timeline-item {
    position: relative;
    padding-bottom: 3rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -38px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 15px var(--accent-glow);
    transition: var(--transition);
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.3);
}

.timeline-content {
    background: var(--bg-secondary);
    padding: 1.5rem 2rem;
    border-radius: 15px;
    border: 1px solid var(--card-border);
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    border-color: var(--accent);
    transform: translateX(10px);
}

.timeline-date {
    display: inline-block;
    background: var(--accent);
    color: var(--bg-primary);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.3rem;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 0.8rem;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ============================================
   PROJECTS SECTION
============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-secondary);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--card-border);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-placeholder i {
    font-size: 4rem;
    color: var(--accent);
    opacity: 0.5;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    opacity: 0;
    transition: var(--transition);
}

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

.project-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transform: translateY(20px);
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-link {
    transform: translateY(0);
    opacity: 1;
}

.project-link:hover {
    background: var(--text-primary);
    transform: scale(1.1) !important;
}

.project-card:hover .project-link:nth-child(2) {
    transition-delay: 0.1s;
}

.project-content {
    padding: 1.5rem 2rem 2rem;
}

.project-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.75rem;
    padding: 0.3rem 0.8rem;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    border-radius: 20px;
    font-weight: 500;
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ============================================
   CONTACT SECTION
============================================ */
.contact-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    margin-top: -1rem;
}

.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-radius: 15px;
    text-decoration: none;
    transition: var(--transition);
    border: 1px solid var(--card-border);
}

.contact-card:hover {
    background: var(--accent);
    color: var(--bg-primary);
    transform: translateY(-5px);
    box-shadow: 0 15px 30px var(--accent-glow);
}

.contact-card:hover i {
    color: var(--bg-primary);
}

.contact-card:hover p {
    color: var(--bg-primary);
    opacity: 0.9;
}

.contact-card i {
    font-size: 1.8rem;
    color: var(--accent);
    transition: var(--transition);
}

.contact-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

/* ============================================
   FOOTER
============================================ */
footer {
    padding: 3rem 0 2rem;
    text-align: center;
    border-top: 1px solid var(--card-border);
    margin-top: 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.3rem;
    font-weight: 700;
    font-family: var(--font-heading);
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid var(--card-border);
}

.footer-social a:hover {
    background: var(--accent);
    color: var(--bg-primary);
    transform: translateY(-3px);
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   BACK TO TOP BUTTON
============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 5px 20px var(--accent-glow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--accent-dark);
    transform: translateY(-5px);
}

/* ============================================
   RESPONSIVE DESIGN
============================================ */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-text {
        order: 2;
    }

    .hero-image {
        order: 1;
    }

    .hero-text p.bio {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-image .img-wrapper {
        width: 300px;
        height: 300px;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem !important;
    }

    h2 {
        font-size: 2rem;
    }

    .hero-text h2 {
        font-size: 1.5rem;
    }

    .section {
        padding: 4rem 0;
    }

    /* Mobile Navigation */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: var(--transition);
        z-index: 999;
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }

    .nav-links.active {
        right: 0;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    .hamburger {
        display: flex;
    }

    .mobile-menu-overlay {
        display: block;
    }

    .mobile-menu-overlay.active {
        display: block;
    }

    /* Timeline Mobile */
    .timeline {
        padding-left: 20px;
    }

    .timeline-dot {
        left: -28px;
        width: 12px;
        height: 12px;
    }

    .timeline-content {
        padding: 1.2rem 1.5rem;
    }

    /* Footer Mobile */
    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
    }

    /* Back to Top Mobile */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    /* Hero CTA Mobile */
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    h1 {
        font-size: 2rem !important;
    }

    .hero-image .img-wrapper {
        width: 250px;
        height: 250px;
    }

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

    .skill-card {
        padding: 1.5rem 1rem;
    }

    .skill-card i {
        font-size: 2rem;
    }

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

    .contact-container {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   TILT EFFECT (Enhanced on hover)
============================================ */
[data-tilt] {
    transform-style: preserve-3d;
}