/* --- CSS VARIABLES (LIGHT THEME) --- */
:root {
    --bg-base: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #64748b;
    
    --accent-primary: #2563eb;
    --accent-secondary: #0ea5e9;
    --accent-tertiary: #10b981;
    
    --border-color: rgba(255, 255, 255, 0.4);
    --shadow-soft: 0 10px 40px -10px rgba(15, 23, 42, 0.08);
    --shadow-hover: 0 20px 40px -10px rgba(37, 99, 235, 0.15);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- RESET & GLOBAL --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* --- DYNAMIC BACKGROUND SHAPES --- */
.bg-shape {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.6;
    animation: float 20s infinite alternate ease-in-out;
}

.shape-1 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, #bfdbfe, #e0f2fe);
    top: -10%;
    left: -10%;
}

.shape-2 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #d1fae5, #ccfbf1);
    bottom: 10%;
    right: -5%;
    animation-delay: -5s;
}

.shape-3 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #ddd6fe, #fbcfe8);
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* --- GLASSMORPHISM UTILITY --- */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    border-radius: 24px;
    transition: var(--transition);
}

.glass-card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

/* --- NAVIGATION --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
}

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

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

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger .bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: var(--transition);
    border-radius: 3px;
}

/* --- BUTTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 700;
    font-family: var(--font-heading);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #ffffff;
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(37, 99, 235, 0.4);
    filter: brightness(1.1);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
    background: #ffffff;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
    transform: translateY(-3px);
}

/* --- SECTIONS COMMON --- */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 8rem 0;
}

.section-header {
    margin-bottom: 4rem;
}

.section-subtitle {
    display: block;
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--accent-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -1px;
}

/* --- HERO SECTION --- */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px;
}

.hero-content {
    max-width: 800px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent-primary);
    border-radius: 100px;
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradientMove 5s linear infinite;
}

@keyframes gradientMove {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin-bottom: 3rem;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
}

/* --- ABOUT SECTION --- */
.about-card {
    padding: 3rem;
    border-left: 6px solid var(--accent-primary);
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.about-text p:last-child {
    margin-bottom: 0;
}

/* --- EDUCATION TIMELINE --- */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(37, 99, 235, 0.2);
}

.timeline-item {
    position: relative;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
}

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

.timeline-dot {
    position: absolute;
    left: -2.6rem;
    top: 2.5rem;
    width: 20px;
    height: 20px;
    background: var(--bg-base);
    border: 4px solid var(--accent-primary);
    border-radius: 50%;
    z-index: 2;
}

.emerald-dot {
    border-color: var(--accent-tertiary);
}

.timeline-date {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline-subtitle {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.timeline-badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-tertiary);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.timeline-text {
    color: var(--text-secondary);
}

/* --- PROJECTS --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.project-card {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
}

.project-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    background: rgba(255,255,255,0.5);
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.project-desc {
    color: var(--text-secondary);
    flex-grow: 1;
}

/* --- SKILLS --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-category {
    padding: 2.5rem;
}

.skill-category-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tag:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.lang-native {
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--accent-tertiary);
}

.lang-b2 {
    border-color: rgba(14, 165, 233, 0.4);
    color: var(--accent-secondary);
}

/* --- CONTACT --- */
.contact-box {
    padding: 5rem 3rem;
    text-align: center;
    background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.5));
    border: 2px solid #ffffff;
}

.contact-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.contact-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.contact-btn {
    font-size: 1.1rem;
    padding: 1.2rem 2.5rem;
}

/* --- FOOTER --- */
footer {
    border-top: 1px solid rgba(0,0,0,0.05);
    padding: 2.5rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent-primary);
}

/* --- ANIMATIONS (SCROLL REVEAL) --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 992px) {
    .hero-title { font-size: 3.5rem; }
    section { padding: 6rem 0; }
}

@media (max-width: 768px) {
    .hamburger { display: block; }
    
    .nav-links {
        position: fixed;
        top: -100vh;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.5s ease;
        backdrop-filter: blur(10px);
    }

    .nav-links.active { top: 0; }
    .nav-links a { font-size: 1.5rem; }

    .hero-title { font-size: 2.8rem; }
    .hero-buttons { flex-direction: column; }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}