/* RangeZero tokens (docs/BRAND.md). Dark is the brand default; light is offered for readability. */
:root {
  --rz-orange: #FF6A00; --rz-amber: #FF9F2E; --rz-white: #F4F4F4; --rz-charcoal: #0B0E11;
  --bg: var(--rz-charcoal); --fg: var(--rz-white); --muted: #9aa3ad; --accent: var(--rz-orange);
  --font-head: "Rajdhani", "Inter", system-ui, sans-serif; --font-body: "Inter", system-ui, sans-serif;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) { --bg: var(--rz-white); --fg: var(--rz-charcoal); --muted: #56606b; --accent: #D95A00; }
}
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 var(--font-body);
  min-height: 100vh; display: flex; flex-direction: column; }
body > main { flex: 1 0 auto; width: 100%; box-sizing: border-box; }
main { max-width: 40rem; margin: 20vh auto 0; padding: 0 16px; }
h1 { font: 700 clamp(2.2rem, 7vw, 3.2rem)/1.1 var(--font-head); letter-spacing: .08em; margin: 0 0 .25rem; }
h1 .zero { color: var(--accent); }
.tagline { font-family: var(--font-head); letter-spacing: .3em; text-transform: uppercase; font-size: .9rem; }
.muted { color: var(--muted); }

/* layout */
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px;
  border-bottom: 1px solid rgba(255,255,255,.08); gap: 12px; flex-wrap: wrap; }
.brand { font: 700 1.3rem var(--font-head); letter-spacing: .12em; color: var(--fg); text-decoration: none; }
nav { display: flex; gap: 14px; align-items: center; }
nav a { color: var(--fg); text-decoration: none; }
main.narrow { max-width: 34rem; margin: 40px auto; padding: 0 16px; }
main.hero { max-width: 40rem; margin: 18vh auto 0; padding: 0 16px; }
footer { text-align: center; padding: 40px 16px; font-size: .85rem; }
h2 { font: 600 1.25rem var(--font-head); letter-spacing: .04em; margin-top: 0; }
a { color: var(--accent); }

/* forms */
.stack { display: grid; gap: 14px; margin: 16px 0; }
label { display: grid; gap: 6px; font-weight: 500; }
label.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; }
input, select { font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid rgba(127,127,127,.4);
  background: transparent; color: var(--fg); max-width: 100%; box-sizing: border-box; }
select option { color: #111; }
fieldset { border: 1px solid rgba(127,127,127,.4); border-radius: 8px; padding: 10px 12px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.button { display: inline-block; background: var(--accent); color: #111; border: 0; border-radius: 8px;
  padding: 10px 18px; font: 600 1rem var(--font-body); cursor: pointer; text-decoration: none; }
.button.small { padding: 6px 12px; font-size: .9rem; }
.button.secondary { background: transparent; color: var(--fg); border: 1px solid rgba(127,127,127,.5); }
button.link { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; padding: 0; }
form.inline { display: inline; }
small { font-weight: 400; }

/* feedback */
.error { border-left: 3px solid #e5484d; padding: 8px 12px; background: rgba(229,72,77,.1); }
.notice { border-left: 3px solid var(--accent); padding: 8px 12px; background: rgba(255,106,0,.08); }
.badge { font-size: .75rem; padding: 2px 8px; border-radius: 999px; border: 1px solid rgba(127,127,127,.5); margin-left: 6px; }
.badge.ok { border-color: #30a46c; color: #30a46c; }
.badge.warn { border-color: var(--rz-amber); color: var(--rz-amber); }

/* account */
.card { border: 1px solid rgba(127,127,127,.25); border-radius: 12px; padding: 16px; margin: 16px 0; }
dl.grid { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; }
dd { margin: 0; overflow-wrap: anywhere; }
table.sessions { width: 100%; border-collapse: collapse; font-size: .9rem; margin-bottom: 12px; display: block; overflow-x: auto; }
table.sessions th, table.sessions td { text-align: left; padding: 6px 8px; border-bottom: 1px solid rgba(127,127,127,.2); }
.qr { background: #fff; display: inline-block; padding: 12px; border-radius: 8px; }
.qr svg { width: 200px; height: 200px; display: block; }
code.secret { overflow-wrap: anywhere; }

/* learning pages */
main.wide { max-width: 56rem; margin: 32px auto; padding: 0 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 16px; }
.link-card { color: var(--fg); text-decoration: none; display: block; }
.link-card:hover { border-color: var(--accent); }
.small { font-size: .85rem; }
.crumbs { font-size: .9rem; color: var(--muted); }
.crumbs a { color: var(--muted); }
.level { margin: 28px 0; }
.level-head { display: flex; align-items: baseline; gap: 10px; }
.level-num { font-family: var(--font-head); color: var(--accent); border: 1px solid var(--accent); border-radius: 6px; padding: 0 6px; }
ul.rooms { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
ul.rooms a { font-weight: 600; margin-right: 6px; }
.meta .badge:first-child { margin-left: 0; }
.task-num { color: var(--accent); font-size: .9rem; margin-right: 6px; }
.question { border-top: 1px solid rgba(127,127,127,.2); padding-top: 12px; margin-top: 12px; }
.answer-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.answer-row input { flex: 1 1 14rem; }
.mask code { color: var(--muted); letter-spacing: .1em; }
.prose { overflow-wrap: anywhere; }
.prose pre { background: rgba(127,127,127,.12); padding: 12px; border-radius: 8px; overflow-x: auto; }
.prose table { border-collapse: collapse; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid rgba(127,127,127,.3); padding: 4px 10px; text-align: left; }

/* admin */
.subnav { display: flex; gap: 16px; margin: 8px 0 20px; flex-wrap: wrap; border-bottom: 1px solid rgba(127,127,127,.2); padding-bottom: 8px; }
.indent { margin-left: 8px; padding-left: 12px; border-left: 2px solid rgba(127,127,127,.2); margin-top: 12px; }
textarea { font: .95rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; padding: 10px 12px; border-radius: 8px;
  border: 1px solid rgba(127,127,127,.4); background: transparent; color: var(--fg); width: 100%; box-sizing: border-box; }

/* scoring */
progress.progress { width: 100%; height: 8px; border: 0; border-radius: 999px; background: rgba(127,127,127,.2); overflow: hidden; margin: 8px 0 4px; appearance: none; }
progress.progress::-webkit-progress-bar { background: rgba(127,127,127,.2); }
progress.progress::-webkit-progress-value { background: var(--accent); }
progress.progress::-moz-progress-bar { background: var(--accent); }
.question.solved { opacity: .85; }
.solved-line { margin: 6px 0; }
.hint { border-left: 3px solid var(--rz-amber); padding: 4px 10px; margin-top: 8px; }
.subnav a[aria-current="page"] { color: var(--accent); font-weight: 600; }
table.board tr.me td { font-weight: 700; color: var(--accent); }
ul.badges { list-style: none; padding: 0; display: grid; gap: 6px; }
.badge-item strong { color: var(--accent); }

/* imagery */
img.cover { width: calc(100% + 32px); margin: -16px -16px 12px; height: 150px; object-fit: cover; border-radius: 12px 12px 0 0; display: block; }
.link-card { overflow: hidden; }
img.banner { width: 100%; height: clamp(140px, 28vw, 260px); object-fit: cover; border-radius: 12px; display: block; margin: 8px 0 16px; }
/* The home page is always dark: the brand and its hero photo are built for it. */
body.force-dark { --bg: var(--rz-charcoal); --fg: var(--rz-white); --muted: #9aa3ad; --accent: var(--rz-orange); }
.hero-bg { position: fixed; inset: 0; z-index: -1; background: linear-gradient(90deg, var(--rz-charcoal) 22%, rgba(11,14,17,.55) 55%, rgba(11,14,17,.1) 85%), url("/static/img/hero-summit.webp") right center / cover no-repeat; }
@media (max-width: 700px) { .hero-bg { background: linear-gradient(0deg, var(--rz-charcoal) 40%, rgba(11,14,17,.35)), url("/static/img/hero-summit.webp") center top / cover no-repeat; } }
main.hero { position: relative; }

/* CybRange (lab) accents: the brand's cyan sub-palette (docs/BRAND.md) */
.lab-panel { border-color: rgba(0,229,255,.35); }
.cyb { font-family: var(--font-head); color: #00E5FF; letter-spacing: .12em; font-size: .9em; margin-right: 6px; }
.button.cyb-button { background: #00E5FF; color: #0B1B2B; }

/* Browser terminal (CybRange) */
.terminal { height: calc(100vh - 220px); min-height: 320px; background: #0B1B2B; border: 1px solid rgba(0,229,255,.35); border-radius: 8px; padding: 6px; }
.term-head p { margin: 4px 0; }
.button.small { padding: 4px 10px; font-size: .85em; }