:root {
    --bg-color: #f5f5f5;
    --text-color: #1a1a1a;
    --primary-color: #ac364a;
    --secondary-color: #ffffff;
    --accent-color: #2d3436;
    --card-bg: #ffffff;
    --section-alt-bg: #f0f0f0;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --font-main: 'Quicksand', sans-serif;
    --font-head: 'Bebas Neue', sans-serif;
    --nav-bg: #f5f5f5;
}

body.dark-theme {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --secondary-color: #1e1e1e;
    --card-bg: #1e1e1e;
    --section-alt-bg: #181818;
    --accent-color: #f4f4f4;
    --shadow: 0 4px 6px rgba(0,0,0,0.5);
    --nav-bg: #121212;
}

@media (prefers-color-scheme: dark) {
    body:not(.light-theme) {
        --bg-color: #121212;
        --text-color: #e0e0e0;
        --secondary-color: #1e1e1e;
        --card-bg: #1e1e1e;
        --section-alt-bg: #181818;
        --accent-color: #f4f4f4;
        --shadow: 0 4px 6px rgba(0,0,0,0.5);
        --nav-bg: #121212;
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3 {
    font-family: var(--font-head);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

/* Loader */
.loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 1s ease, visibility 1s;
}

.loader-wrapper.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-code {
    font-family: 'Courier New', Courier, monospace;
    font-size: clamp(1.2rem, 4vw, 2rem);
    font-weight: bold;
    color: var(--primary-color);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    border-right: 3px solid var(--primary-color);
    animation: typing-code 1s steps(20) forwards, blink-caret 0.75s step-end infinite;
    text-align: center;
    margin: 0 auto;
}

@keyframes typing-code {
    from { width: 0; }
    to { width: 22ch; } /* Dokładna liczba znaków w: </>Protocol loaded...</> */
}

@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: var(--primary-color); }
}

body.loading {
    overflow: hidden;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--nav-bg);
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    transition: background-color 0.3s;
}

.logo {
    font-family: var(--font-head);
    font-size: 1.5rem;
    color: var(--primary-color);
}

.logo a {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.lang-switch {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.lang-btn {
    cursor: pointer;
    border: 1px solid transparent;
    padding: 2px;
    border-radius: 3px;
    transition: border-color 0.2s;
}

.lang-btn.active {
    border-color: var(--primary-color);
}

.lang-btn img {
    width: 24px;
    height: auto;
    display: block;
}

/* Sections */
section {
    padding: 100px 10% 60px;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero {
    text-align: center;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('../assets/code-coding-computer-34676.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 80px; /* Offset for fixed nav */
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.5rem;
}

.hero-image {
    margin: 2rem 0;
}

.profile-pic {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-pic:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(172, 54, 74, 0.5);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
}

/* Bio Stats */
.bio-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.stat-item {
    background: var(--card-bg);
    border-bottom: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 120px;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.stat-item span:not(.stat-label) {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    margin-top: 0.5rem;
    word-break: break-word;
}

.stat-label {
    font-size: 0.85rem;
    display: block;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-color);
    opacity: 0.7;
    font-weight: 500;
}

/* Contact */
.contact-content {
    text-align: center;
}

.email-big {
    font-size: clamp(1.5rem, 5vw, 3rem);
    margin: 2rem 0;
    word-break: break-all;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
}

.social-links img {
    width: 40px;
    height: 40px;
    transition: transform 0.2s, filter 0.3s;
}

body.light-theme .social-links img {
    filter: brightness(0); /* Ciemne ikony w jasnym motywie */
}

body.dark-theme .social-links img {
    filter: brightness(0) invert(1); /* Białe ikony w ciemnym motywie */
}

/* Obsługa preferencji systemowych jeśli klasy JS nie zostały jeszcze nadane */
@media (prefers-color-scheme: dark) {
    body:not(.light-theme) .social-links img {
        filter: brightness(0) invert(1);
    }
}

.social-links img:hover {
    transform: scale(1.1);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: var(--section-alt-bg);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple burger menu could be added here */
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    section {
        padding: 80px 5% 40px;
    }
}