/* default colors */

html {
    scroll-behavior: smooth;
}

:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #334155;
    --gradient-1: #3b82f6;
    --gradient-2: #8b5cf6;
    --success: #10b981;
}

/* general setup */

body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
}

section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 20px;
}

h2 {
    font-size: 3rem;
    margin-bottom: 2rem;
    text-align: center;
    position: relative;
    padding-bottom: 2rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
    border-radius: 2px;
}

/* navigation bar */

nav {
    position: sticky;
    width: 100%;
    top: 0;
    border-bottom: 1px solid var(--border);
    padding: 0.1rem 0;
    background: var(--bg-primary);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 2rem;
    border-radius: 10px;
    transition: all 0.2s;
}

nav a:hover {
    color: var(--accent);
    background: var(--bg-secondary);
}


/* default footer */

footer {
    background: var(--bg-secondary);
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

footer h3 {
    font-size: 1rem;
    margin-top: 0;
    margin-bottom: 1.3rem;
}

footer .icons {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}


footer a {
    color: var(--text-decondary);
    transition: all 0.2s;
    width: 2rem;
    height: 2rem;
}

footer a:hover {
    color: white;
    transform: translateY(-0.4rem);
}

/* the main page - starting page */

.starting-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
}

.starting-page h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    /* Make background color of the text transparent, but not for the text in Chrome and Safari */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    /* for Firefox */
    background-clip: text;
}

.starting-page .profession {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

/* About section */

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

.about-text p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.about-photo img {
    width: 100%;
    border-radius: 50%;
}

/* skills section */

.skill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.skill-category {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.skill-category h3 {
    color: var(--accent);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.skill-category:hover {
    transform: translateY(-0.2rem);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.skill-category li {
    color: var(--text-secondary);
    padding: 0.5rem 0;
}

/* projects */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1rem;
}

.project-card {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    overflow: hidden;
    margin: 0.5rem 0.1rem;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.3);
}

.project-title {
    height: 200px;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.project-content {
    padding: 25px;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.tag {
    background: var(--bg-secondary);
    color: var(--accent);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}

/* responsiveness */

@media (max-width: 768px) {
    nav ul {
        gap: 5px;
    }

    nav a {
        padding 8px 12px;
        font-size: 0.9rem;
    }

    .starting-page h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }
}