:root {
    --bg: #050910; --panel: #0b1723; --line: #304254;
    --text: #f3f6f8; --soft: #b5c2cf; --muted: #8190a1;
    --focus: #ffb000; --cyan: #35c9ec; --green: #59df8e;
    --mono: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
    --sans: Inter, "Segoe UI", Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-width: 320px; min-height: 100%; }
body {
    background: var(--bg); color: var(--text); font-family: var(--sans);
    background-image: linear-gradient(rgba(255,255,255,.014) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.011) 1px, transparent 1px);
    background-size: 52px 52px;
}
a { color: inherit; }
.guide-topbar {
    position: sticky; top: 0; z-index: 10; min-height: 58px;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 clamp(18px, 4vw, 58px); border-bottom: 1px solid var(--line);
    background: rgba(3,7,12,.96);
}
.guide-brand { font-size: 19px; font-weight: 900; text-decoration: none; letter-spacing: -.7px; }
.guide-brand span { color: var(--focus); }
.guide-topbar nav { display: flex; align-items: stretch; align-self: stretch; }
.guide-topbar nav a {
    min-width: 100px; min-height: 44px; display: inline-flex; align-items: center;
    justify-content: center; padding: 0 14px; border-left: 1px solid var(--line);
    color: var(--soft); text-decoration: none; font: 700 9px/1 var(--mono);
    letter-spacing: .7px;
}
.guide-topbar nav a:hover, .guide-topbar nav a:focus-visible { color: #050910; background: var(--focus); outline: none; }
main { width: min(1180px, calc(100% - 36px)); margin: 0 auto; padding: 58px 0 72px; }
.guide-hero { max-width: 900px; margin-bottom: 44px; }
.eyebrow { margin: 0 0 12px; color: var(--cyan); font: 800 10px/1.2 var(--mono); letter-spacing: 1.3px; }
h1 { margin: 0; max-width: 820px; font-size: clamp(42px, 6vw, 78px); line-height: .98; letter-spacing: -2.5px; }
.lead { max-width: 880px; margin: 24px 0 0; color: var(--soft); font-size: clamp(17px, 2vw, 23px); line-height: 1.5; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero-actions a { min-height: 44px; display: inline-flex; align-items: center; padding: 0 17px; border: 1px solid var(--line); text-decoration: none; color: var(--soft); font: 800 10px var(--mono); }
.hero-actions a.primary { color: #050910; background: var(--focus); border-color: var(--focus); }
.hero-actions a:hover, .hero-actions a:focus-visible { border-color: var(--focus); color: var(--text); outline: none; }
.hero-actions a.primary:hover, .hero-actions a.primary:focus-visible { color: #050910; }
.guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.guide-grid article { min-height: 245px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(11,23,35,.82); }
.guide-grid article > b { color: var(--focus); font: 800 28px/1 var(--mono); }
h2 { margin: 12px 0 12px; font-size: 23px; line-height: 1.15; }
h3 { margin: 0 0 8px; font-size: 16px; }
.guide-grid p, .guide-section p, .guide-section li { color: var(--soft); font-size: 15px; line-height: 1.55; }
.guide-section { margin-top: 42px; padding: 28px; border: 1px solid var(--line); background: rgba(11,23,35,.8); }
.guide-section > div:first-child h2, .limits h2 { margin-top: 0; }
.tool-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 22px; }
.tool-list article { padding: 18px; border-left: 3px solid var(--cyan); background: rgba(255,255,255,.025); }
.two-col { display: grid; grid-template-columns: 1.35fr .65fr; gap: 28px; align-items: center; }
.note { padding: 22px; border: 1px solid #715517; background: rgba(255,176,0,.08); }
.note h3 { color: var(--focus); }
.limits ol { margin: 18px 0; padding-left: 24px; }
.limits li { margin: 10px 0; }
.limit-line { margin: 24px 0 0; padding: 18px; border-left: 4px solid var(--focus); background: rgba(255,176,0,.08); }
footer { padding: 18px; border-top: 1px solid var(--line); color: var(--muted); text-align: center; font: 700 9px/1.4 var(--mono); letter-spacing: .75px; }
@media (max-width: 860px) {
    .guide-grid, .tool-list { grid-template-columns: 1fr 1fr; }
    .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
    .guide-topbar { padding: 0 12px; }
    .guide-topbar nav a { min-width: 74px; padding: 0 9px; }
    main { width: min(100% - 24px, 1180px); padding-top: 38px; }
    .guide-grid, .tool-list { grid-template-columns: 1fr; }
    .guide-grid article { min-height: 0; }
    .guide-section { padding: 20px; }
}