:root {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --accent-color: #0ea5e9; /* Sky Blue */
    --accent-hover: #38bdf8;
    --secondary-bg: #1e293b;
    --success-color: #22c55e;
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(180deg, rgba(15,23,42,1) 0%, rgba(30,41,59,0.8) 100%);
    padding: 20px 0;
    position: sticky;
    top: 0;
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid #334155;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    text-decoration: none;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background-image: radial-gradient(circle at center, #1e293b 0%, #0f172a 70%);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero .highlight {
    color: var(--accent-color);
    background: -webkit-linear-gradient(45deg, #0ea5e9, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: #94a3b8;
    max-width: 700px;
    margin: 0 auto 40px;
}

.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.2s, background-color 0.2s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

/* Features */
.features {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background-color: var(--secondary-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #334155;
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}

.card h3 {
    color: var(--accent-color);
    margin-top: 0;
}

/* AI Benefits */
.ai-section {
    background-color: var(--secondary-bg);
    padding: 80px 0;
    border-top: 1px solid #334155;
    border-bottom: 1px solid #334155;
}

.check-list {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 0 auto;
}

.check-list li {
    margin-bottom: 15px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
}

.check-list li::before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    margin-right: 15px;
    font-size: 1.2rem;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: #64748b;
    border-top: 1px solid #334155;
    margin-top: 50px;
}

/* Mobile */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; } /* Uproszczenie dla demo */
}