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

:root {
    color-scheme: dark;
}

body {
    font-family: system-ui, sans-serif;
    background: #1a1a1a;
    color: #fff;
    line-height: 1.6;
    padding: 24px;
}

.container {
    max-width: 720px;
    margin: 0 auto;
}

/* ---- Hero ---- */
.hero {
    text-align: center;
    padding: 80px 0 64px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 12px;
}

.hero .tagline {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background 0.15s, color 0.15s;
}

.btn-primary {
    background: #fff;
    color: #1a1a1a;
}

.btn-primary:hover {
    background: rgba(255, 255, 255, 0.85);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* ---- Sections ---- */
section {
    padding: 48px 0;
}

section h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
}

/* ---- Modes ---- */
.modes {
    display: grid;
    gap: 12px;
}

.mode-card {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 16px 20px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
}

.mode-name {
    font-weight: 600;
    font-size: 14px;
    min-width: 72px;
    flex-shrink: 0;
}

.mode-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.mode-card.off .mode-name { color: rgba(255, 255, 255, 0.5); }
.mode-card.low .mode-name { color: #6ecf6e; }
.mode-card.medium .mode-name { color: #f0c746; }
.mode-card.high .mode-name { color: #e8943a; }
.mode-card.extreme .mode-name { color: #e84a4a; }

/* ---- Install ---- */
.steps {
    display: grid;
    gap: 16px;
    counter-reset: step;
}

.step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px 20px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.08);
}

.step-num {
    font-size: 14px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.4);
    flex-shrink: 0;
    min-width: 20px;
}

.step-content {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

.step-content code {
    display: inline-block;
    margin-top: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    font-family: ui-monospace, "SF Mono", "Cascadia Code", "Segoe UI Mono", monospace;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.85);
    word-break: break-all;
}

/* ---- Footer ---- */
footer {
    padding: 48px 0 32px;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

footer a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
}

footer a:hover {
    color: #fff;
}

/* ---- Responsive ---- */
@media (max-width: 480px) {
    .hero { padding: 48px 0 40px; }
    .hero h1 { font-size: 36px; }
    .hero .tagline { font-size: 16px; }
    .mode-card { flex-direction: column; gap: 4px; }
    .step { flex-direction: column; gap: 8px; }
}