:root {
    --bg-color: #0f172a; 
    --text-main: #94a3b8; 
    --text-highlight: #f1f5f9; 
    --accent-color: #5eead4; 
    --nav-hover: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

@media (min-width: 1024px) {
    .container {
        flex-direction: row;
        justify-content: space-between;
        padding: 0 50px;
    }
}

/* LEFT COLUMN - STICKY NAVIGATION */

.profile-img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid rgba(94, 234, 212, 0.2);
    margin-bottom: 1rem;
}

header {
    padding: 50px 24px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

@media (min-width: 1024px) {
    header {
        width: 45%;
        height: 100vh;
        position: sticky;
        top: 0;
        padding: 80px 0;
    }
}

header h1 {
    font-size: 3rem;
    color: var(--text-highlight);
    font-weight: 700;
    letter-spacing: -0.025em;
}

header h2 {
    font-size: 1.25rem;
    color: var(--text-highlight);
    margin-top: 10px;
    font-weight: 500;
}

header p {
    margin-top: 1.5rem;
    max-width: 300px;
}

nav {
    margin-top: 4rem;
    display: none;
}

@media (min-width: 1024px) {
    nav { display: block; }
}

nav ul { list-style: none; }
nav li { margin-bottom: 1rem; }
nav a {
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all 0.2s;
    display: flex;
    align-items: center;
}

nav a:hover {
    color: var(--nav-hover);
    transform: translateX(10px);
}

.social-links {
    margin-top: 3rem;
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 1.5rem; 
    transition: all 0.3s ease;
}

.social-links a:hover { 
    color: var(--nav-hover);
    transform: translateY(-3px); 
}

.social-links i {
    display: inline-block;
    min-width: 1.5rem;
    text-align: center;
}

/* RIGHT COLUMN - CONTENT */
main {
    padding: 50px 24px;
}

@media (min-width: 1024px) {
    main {
        width: 50%;
        padding: 80px 0;
    }
}

section {
    margin-bottom: 4rem;
    scroll-margin-top: 100px;
}

.mobile-header {
    display: block;
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    padding: 1rem 0;
    text-transform: uppercase;
    font-size: 0.8rem;
    color: var(--text-highlight);
    letter-spacing: 0.1em;
}

@media (min-width: 1024px) {
    .mobile-header { display: none; }
}

.summary-text {
    font-size: 1.1rem;
}

.summary-text strong { color: var(--accent-color); }

/* SKILLS */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.5rem;
}

.skill-tag {
    background: rgba(94, 234, 212, 0.1);
    color: var(--accent-color);
    padding: 0.4rem 1rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* EXPERIENCE CARDS */
.card {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 0.5rem;
    transition: background 0.3s;
}

.card:hover {
    background: rgba(255, 255, 255, 0.03);
}

.card h4 {
    color: var(--text-highlight);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.card .date {
    font-size: 0.8rem;
    display: block;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.card ul { list-style: none; }
.card li {
    font-size: 0.9rem;
    margin-bottom: 0.6rem;
    padding-left: 1.2rem;
    position: relative;
}

.card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.cert-img {
    margin-top: 1rem;
    width: 100%;
    max-width: 400px;
    border-radius: 0.4rem;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.cert-img:hover { opacity: 1; }