:root {
    --bg: #0d0f12;
    --text: #e0e0e0;
    --accent: #5da9ff;
    --muted: #888;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

header {
    position: sticky;
    top: 0;
    z-index: 1000;

    display: flex;
    justify-content: space-between;
    align-items: center;

    padding: 16px 40px;

    background: rgba(13, 15, 18, 0.85);
    backdrop-filter: blur(6px);

    border-bottom: 1px solid transparent;
    transition: background 0.3s ease, border-color 0.3s ease;
}

header.scrolled {
    background: rgba(13, 15, 18, 0.95);
    border-bottom: 1px solid #222;
}

.logo {
    font-weight: 600;
    letter-spacing: 2px;
}

.lang-switch button {
    background: none;
    border: 1px solid #333;
    color: var(--muted);
    padding: 6px 10px;
    margin-left: 6px;
    cursor: pointer;
}

.lang-switch button.active {
    color: var(--accent);
    border-color: var(--accent);
}

.hero {
    text-align: center;
    padding: 80px 20px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.hero p {
    color: var(--muted);
}

section {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
}

h2 {
    color: var(--accent);
    margin-bottom: 15px;
}

ul {
    padding-left: 20px;
}

.contact {
    text-align: center;
}

footer {
    text-align: center;
    padding: 40px 0;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Fade */
.fade-out {
    opacity: 0;
    transition: opacity 0.15s ease;
}

.fade-in {
    opacity: 1;
    transition: opacity 0.15s ease;
}

/* SVG */
#hero-graphic {
    margin-top: 40px;
    width: 100%;
    max-width: 600px;
    opacity: 0.7;
    transition: opacity 0.6s ease, transform 0.6s ease;
}

#hero-graphic.active {
    opacity: 1;
    transform: scale(1.02);
}