:root {
    --bg: #0d1117;
    --text: #c9d1d9;
    --text-dim: #8b949e;
    --accent: #1f6feb;
    --accent-hover: #388bfd;
    --border: #30363d;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-weight: 300;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    letter-spacing: 0.02em;
}

.nav {
    position: sticky;
    top: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo {
    width: 34px;
    height: 34px;
    border-radius: 6px;
}

.nav-slogan {
    font-weight: 500;
    font-size: 1.05rem;
    letter-spacing: 0.06em;
    margin-right: auto;
}

.nav-links {
    margin-left: auto;
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-dim);
    font-weight: 300;
    text-decoration: none;
}

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

.hero {
    text-align: center;
    padding: 72px 20px 44px;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 300;
    letter-spacing: 0.12em;
    margin-bottom: 10px;
}

.hero-sub {
    color: var(--text-dim);
    font-size: 1.1rem;
    font-weight: 300;
    letter-spacing: 0.08em;
}

.cards {
    max-width: 1080px;
    margin: 0 auto;
    padding: 24px 20px 48px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.card h2 {
    font-size: 1.35rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--accent-hover);
    margin-bottom: 14px;
}

.card p {
    color: var(--text-dim);
    font-weight: 300;
}

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

.card a:hover {
    color: #79c0ff;
}

.btn-outline {
    display: inline-block;
    background: var(--bg);
    color: var(--accent-hover);
    border: 1px solid var(--accent);
    border-radius: 8px;
    padding: 8px 30px;
    margin-top: 18px;
    font-weight: 400;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    text-decoration: none;
}

.news {
    max-width: 1080px;
    margin: 0 auto;
    padding: 24px 20px 48px;
    text-align: center;
}

.news h2 {
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--accent-hover);
    margin-bottom: 20px;
}

.news-empty {
    color: var(--text-dim);
    font-weight: 300;
}

.download-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 120px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.download-hint {
    color: var(--text-dim);
    font-weight: 300;
    font-size: 0.95rem;
    text-align: center;
    max-width: 480px;
}

.download-page select {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 20px;
    font-size: 1.05rem;
    font-weight: 300;
    min-width: 280px;
    text-align: center;
}

.download-page select:focus {
    outline: none;
    border-color: var(--accent);
}

.download-page .btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 12px 40px;
    font-size: 1.05rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    cursor: pointer;
    font-family: inherit;
}

.download-page .btn-primary:hover {
    background: var(--accent-hover);
}

.download-page .btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.download-page .error {
    color: var(--danger);
    font-weight: 300;
    margin-top: 8px;
}

.hidden {
    display: none;
}

.jvm-section {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 20px 48px;
}

.jvm-section h2 {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--accent-hover);
    margin-bottom: 24px;
}

.jvm-block {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    counter-reset: jvm-line;
    overflow-x: auto;
}

.jvm-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    left: 0;
}

.jvm-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.jvm-dot.red {
    background: #f85149;
}

.jvm-dot.yellow {
    background: #d29922;
}

.jvm-dot.green {
    background: #3fb950;
}

.jvm-title {
    margin-left: 8px;
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.04em;
}

.jvm-body {
    padding: 12px 0;
}

.jvm-row {
    padding: 0 20px;
    margin-bottom: 14px;
}

.jvm-row:last-child {
    margin-bottom: 0;
}

.jvm-row .jvm-line {
    padding: 3px 0;
}

.jvm-desc {
    margin: 4px 0 0 40px;
    color: var(--text-dim);
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.02em;
}

.jvm-line {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 12px;
    padding: 3px 0;
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    word-break: break-all;
}

.jvm-line::before {
    counter-increment: jvm-line;
    content: counter(jvm-line);
    color: var(--text-dim);
    opacity: 0.5;
    user-select: none;
    flex-shrink: 0;
}

.jvm-line:hover {
    background: rgba(31, 111, 235, 0.06);
}

.jvm-content {
    display: block;
    min-width: 0;
}

.jvm-line .opt {
    color: #569cd6;
}

.jvm-line .val {
    color: #ce9178;
}

.jvm-line .param {
    color: #dcdcaa;
}

.jvm-line .cmt {
    color: #6a9955;
}

.footer {
    border-top: 1px solid var(--border);
    text-align: center;
    padding: 24px;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 300;
}

.footer a {
    color: var(--accent-hover);
    text-decoration: none;
}

.footer a:hover {
    color: #79c0ff;
}

@media (max-width: 768px) {
    .cards {
        grid-template-columns: 1fr;
    }
}