/* BUS Core — Layout System */

/* ============================
   Global Reset
   ============================ */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    background-color: #0d0d0d;
    color: #d4d4d4;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
                 Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
}

/* ============================
   Layout Container
   ============================ */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================
   Header & Navigation
   ============================ */

header {
    border-bottom: 1px solid #222;
    padding: 1rem 0;
}

header nav {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

header nav a {
    color: #888;
    text-decoration: none;
    margin-right: 1.25rem;
    font-size: 0.9rem;
}

header nav a:hover {
    color: #fff;
    text-decoration: underline;
}

header nav a.active {
    color: #fff;
}

/* ============================
   Main Content
   ============================ */

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

section {
    margin-bottom: 2rem;
}

hr {
    border: none;
    border-top: 1px solid #222;
    margin: 2rem 0;
}

/* ============================
   Typography
   ============================ */

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 1.5rem;
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #fff;
    margin: 0 0 1rem;
}

h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #ccc;
    margin: 1.5rem 0 0.75rem;
}

p {
    margin: 0 0 1rem;
}

ul, ol {
    margin: 0 0 1rem;
    padding-left: 1.25rem;
}

li {
    margin-bottom: 0.35rem;
}

a {
    color: #7cb3ff;
    text-decoration: none;
}

a:hover {
    color: #a8cdff;
    text-decoration: underline;
}

code {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
    font-size: 0.85em;
    background-color: #1a1a1a;
    padding: 0.15rem 0.3rem;
}

/* ============================
   Hero Section (Index Only)
   ============================ */

.hero {
    text-align: center;
    padding: 1.5rem 0 0.5rem;
}

.hero .logo {
    width: 90px;
    height: auto;
    margin-bottom: 0.75rem;
    opacity: 0.9;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    margin: 0 0 0.5rem;
    letter-spacing: -0.01em;
}

.hero .subtitle {
    font-size: 1.1rem;
    color: #aaa;
    margin: 0 0 0.75rem;
}

.hero .tagline {
    font-size: 1rem;
    color: #888;
    margin: 0 0 1.5rem;
}

.hero .actions {
    margin-top: 1.5rem;
}

.hero .actions a {
    color: #7cb3ff;
    margin: 0 0.75rem;
}

.hero .actions a:hover {
    text-decoration: underline;
}

.hero .btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: #2a2a2a;
    border: 1px solid #444;
    color: #fff;
    font-size: 0.9rem;
}

.hero .btn:hover {
    background-color: #333;
    text-decoration: none;
}

/* ============================
   Two Column Layout
   ============================ */

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

/* ============================
   Technical Table
   ============================ */

.tech-table {
    width: auto;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.tech-table td {
    padding: 0.3rem 0;
    vertical-align: top;
}

.tech-table td:first-child {
    width: 140px;
    color: #888;
    padding-right: 1rem;
}

/* ============================
   Downloads Page
   ============================ */

.download-latest {
    margin: 2rem 0;
}

.download-latest h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.version-meta {
    color: #888;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.checksum-block {
    margin: 1.5rem 0;
    padding: 1rem;
    background-color: #141414;
    border: 1px solid #222;
}

.checksum-block label {
    display: block;
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.checksum-block code {
    display: block;
    font-size: 0.85rem;
    word-break: break-all;
    background: transparent;
    padding: 0;
}

.signing-note {
    font-size: 0.9rem;
    color: #666;
}

/* ============================
   Changelog
   ============================ */

.release {
    margin-bottom: 2rem;
}

.release h2 {
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 0.5rem;
}

.release-date {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
}

/* ============================
   Trust Page
   ============================ */

.trust-item {
    margin-bottom: 1.5rem;
}

.trust-item h2 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.trust-item p {
    margin: 0;
    color: #aaa;
}

/* ============================
   Footer
   ============================ */

footer {
    border-top: 1px solid #222;
    padding: 2rem 1.5rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

.footer-content p {
    margin: 0 0 0.5rem;
}

.footer-content a {
    color: #888;
}

.footer-content a:hover {
    color: #aaa;
}

.footer-content .copyright {
    font-size: 0.85rem;
    color: #555;
    margin-top: 1rem;
}

/* ============================
   Responsive
   ============================ */

@media (max-width: 600px) {
    .two-col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero .actions a {
        display: block;
        margin: 0.5rem 0;
    }
    
    header nav a {
        margin-right: 1rem;
    }
}