:root {
    --rail-dark: #1f2a37;
    --rail-darker: #161e27;
    --rail-accent: #f2a900;   /* signal amber */
    --rail-green: #2e7d32;    /* clear signal */
    --text: #24303c;
    --muted: #5b6b7b;
    --bg: #f4f5f7;
    --card: #ffffff;
    --border: #e2e6ea;
}

* { box-sizing: border-box; }

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

/* --- Header --- */
header {
    background: linear-gradient(135deg, var(--rail-dark), var(--rail-darker));
    color: #fff;
    padding: 28px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo { font-size: 46px; line-height: 1; }

header h1 {
    margin: 0;
    font-size: 2.1rem;
    letter-spacing: 0.5px;
}

.tagline {
    margin: 4px 0 0;
    color: #c8d2dc;
    font-size: 1rem;
}

/* --- Download button --- */
.download-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background: var(--rail-accent);
    color: #1a1200;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    padding: 12px 24px;
    border-radius: 10px;
    box-shadow: 0 3px 0 #b98400;
    transition: transform 0.08s ease, box-shadow 0.08s ease;
}

.download-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 0 #b98400; }
.download-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 #b98400; }

.download-meta {
    font-weight: 500;
    font-size: 0.78rem;
    color: #5a4300;
    margin-top: 2px;
}

.download-btn.large { font-size: 1.35rem; padding: 16px 34px; }

/* --- Nav --- */
nav {
    background-color: var(--rail-darker);
    position: sticky;
    top: 0;
    z-index: 10;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

nav ul li a {
    display: block;
    color: #d5dde5;
    text-decoration: none;
    padding: 12px 18px;
    font-size: 0.95rem;
    border-bottom: 3px solid transparent;
}

nav ul li a:hover {
    color: #fff;
    border-bottom-color: var(--rail-accent);
}

/* --- Main --- */
main {
    max-width: 860px;
    margin: 0 auto;
    padding: 28px 20px;
}

section {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 22px 26px;
    margin-bottom: 22px;
}

section h2 {
    margin-top: 0;
    font-size: 1.5rem;
    border-left: 5px solid var(--rail-accent);
    padding-left: 12px;
}

.features, .steps { padding-left: 4px; }

.features {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.features li {
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
}

.steps { padding-left: 22px; }
.steps li { margin-bottom: 6px; }

code {
    background: #eef1f4;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 6px;
    font-family: "Consolas", "Courier New", monospace;
    font-size: 0.92em;
}

.note { color: var(--muted); font-size: 0.92rem; }

a { color: #1565c0; }

/* --- Download section --- */
.download-section {
    text-align: center;
    background: linear-gradient(135deg, #fff9ec, #fef3d6);
    border-color: #f4dfab;
}

.download-section .download-btn { color: #1a1200; }

.downloads {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 18px;
}

.dl-card {
    background: #fff;
    border: 1px solid #f0deac;
    border-radius: 12px;
    padding: 20px 18px;
    text-align: center;
}

.dl-card h3 { margin: 0 0 6px; font-size: 1.15rem; }
.dl-desc { color: var(--muted); font-size: 0.92rem; margin: 0 0 16px; min-height: 2.6em; }

@media (min-width: 620px) {
    .downloads { grid-template-columns: 1fr 1fr; }
}

/* --- Footer --- */
footer {
    background: var(--rail-dark);
    color: #c8d2dc;
    text-align: center;
    padding: 22px 16px;
    font-size: 0.95rem;
}

/* --- Responsive --- */
@media (min-width: 620px) {
    .features { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
    header { flex-direction: column; text-align: center; }
    .brand { flex-direction: column; }
    header h1 { font-size: 1.8rem; }
}

/* --- Autorstwo: gra jest Pawla Jozwickiego, port tylko ja przenosi --- */
.autorstwo {
    border-left: 4px solid var(--rail-accent);
    background: var(--card);
    padding: 14px 18px;
    margin-bottom: 18px;
    border-radius: 0 6px 6px 0;
}

.autor-stopka {
    margin-top: 10px;
    font-size: 0.88rem;
    color: #9fb0c0;
}