/* Zephyr Cyber Labs
   Palette and type are shared with the SecAI Practice Exams app:
   petrol accent on cool paper, Archivo Expanded for display, Plex Mono for labels. */

@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 500 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url("../fonts/archivo-var-latin.woff2") format("woff2");
}
@font-face {
  font-family: "Public Sans";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("../fonts/public-sans-var-latin.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-400-latin.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-500-latin.woff2") format("woff2");
}

:root {
  --paper: #E8EDF0;
  --sheet: #F6F8F9;
  --sheet-2: #EDF2F4;
  --ink: #10232D;
  --muted: #53687A;
  --rule: #C6D1D8;
  --rule-strong: #93A6B2;

  --petrol: #0A6C87;
  --petrol-ink: #FFFFFF;
  --petrol-wash: #DBEBF0;

  --graphite: #2A3540;
  --graphite-ink: #F6F8F9;

  --display: "Archivo", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --body: "Public Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --r-sm: 4px;
  --r-md: 8px;
  --lift: 0 1px 0 rgba(16, 35, 45, .05), 0 14px 30px -18px rgba(16, 35, 45, .35);
  --gutter: clamp(16px, 4vw, 44px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0D1920;
    --sheet: #14242C;
    --sheet-2: #1A2D36;
    --ink: #DCE7EC;
    --muted: #93A8B5;
    --rule: #26404B;
    --rule-strong: #4A6774;
    --petrol: #58C3DD;
    --petrol-ink: #06222B;
    --petrol-wash: #123540;
    --graphite: #C9D6DD;
    --graphite-ink: #0D1920;
    --lift: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 30px -18px rgba(0, 0, 0, .7);
  }
}

:root[data-theme="dark"] {
  --paper: #0D1920;
  --sheet: #14242C;
  --sheet-2: #1A2D36;
  --ink: #DCE7EC;
  --muted: #93A8B5;
  --rule: #26404B;
  --rule-strong: #4A6774;
  --petrol: #58C3DD;
  --petrol-ink: #06222B;
  --petrol-wash: #123540;
  --graphite: #C9D6DD;
  --graphite-ink: #0D1920;
  --lift: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 30px -18px rgba(0, 0, 0, .7);
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, p, ul, ol, figure, blockquote, pre { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--petrol); text-underline-offset: 3px; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--petrol); outline-offset: 2px; border-radius: 3px; }

.skip {
  position: absolute; left: 12px; top: -60px; z-index: 10;
  padding: 10px 14px; border-radius: var(--r-sm);
  background: var(--graphite); color: var(--graphite-ink); font-weight: 600; text-decoration: none;
}
.skip:focus { top: 12px; }

/* ---------- header ---------- */
.top { border-bottom: 1px solid var(--rule); background: var(--sheet); }
.top-in {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 28px;
  max-width: 1120px; margin: 0 auto; padding: 14px var(--gutter);
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
/* The logo is a mask, so it takes the theme accent in light and dark. */
.brand-mark {
  flex: none; width: 40px; height: 40px;
  background: var(--petrol);
  -webkit-mask: url("../img/mark-mask.png") center / contain no-repeat;
  mask: url("../img/mark-mask.png") center / contain no-repeat;
}
.brand-name {
  font: 800 18px/1 var(--display); font-stretch: 118%;
  letter-spacing: .01em; text-transform: uppercase; white-space: nowrap;
}
.brand-name b { font-weight: 800; color: var(--petrol); }

.nav { display: flex; flex-wrap: wrap; gap: 2px; margin-left: auto; }
.nav a {
  padding: 8px 12px; border-radius: var(--r-sm);
  color: var(--ink); text-decoration: none; font-weight: 500; font-size: 15px;
}
.nav a:hover { background: var(--sheet-2); }
.nav a[aria-current="page"] { background: var(--graphite); color: var(--graphite-ink); }

.theme-btn {
  min-height: 36px; padding: 0 12px;
  border: 1px solid var(--rule-strong); border-radius: var(--r-sm);
  background: transparent; font: 500 12px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase;
}
.theme-btn:hover { background: var(--sheet-2); }

/* ---------- common ---------- */
.wrap { flex: 1; width: 100%; max-width: 1120px; margin: 0 auto; padding: 44px var(--gutter) 88px; }
.wrap-narrow { max-width: 760px; }
.eyebrow { font: 500 12px/1.3 var(--mono); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.h1 {
  font: 800 clamp(30px, 4.6vw, 46px)/1.05 var(--display); font-stretch: 118%;
  letter-spacing: -.015em; text-wrap: balance;
}
.h2 { font: 800 24px/1.15 var(--display); font-stretch: 112%; letter-spacing: -.01em; }
.lede { max-width: 62ch; margin-top: 14px; color: var(--muted); font-size: 17px; text-wrap: pretty; }
.head { display: grid; gap: 10px; margin-bottom: 32px; }

.chip {
  display: inline-block; padding: 2px 8px;
  border: 1px solid var(--rule-strong); border-radius: 99px;
  font: 500 11.5px/1.6 var(--mono); color: var(--muted); white-space: nowrap;
}
.chip-accent { border-color: var(--petrol); color: var(--petrol); background: var(--petrol-wash); letter-spacing: .04em; }

.section-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  padding-bottom: 12px; border-bottom: 2px solid var(--graphite);
}
.more { font: 500 12.5px/1.3 var(--mono); letter-spacing: .04em; white-space: nowrap; }
.empty { padding: 20px 0; color: var(--muted); }

/* ---------- daily recommendation ---------- */
.tip {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0 28px; align-items: center;
  margin: 36px 0 52px; padding: clamp(20px, 3vw, 32px);
  background: var(--sheet); border: 1px solid var(--rule); border-left: 6px solid var(--petrol);
  border-radius: var(--r-md); box-shadow: var(--lift);
}
.tip-date { display: grid; gap: 6px; justify-items: start; padding-right: 28px; border-right: 1px solid var(--rule); }
.tip-day {
  font: 800 clamp(48px, 8vw, 72px)/.9 var(--display); font-stretch: 125%;
  letter-spacing: -.02em; color: var(--petrol); font-variant-numeric: tabular-nums;
}
.tip-month { font: 500 12px/1.3 var(--mono); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.tip-main { display: grid; gap: 10px; min-width: 0; }
.tip-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.tip-title { font: 700 clamp(20px, 2.6vw, 26px)/1.2 var(--display); font-stretch: 105%; text-wrap: balance; }
.tip-body { max-width: 64ch; color: var(--muted); font-size: 17px; }

/* ---------- home columns ---------- */
.cols { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 48px 56px; align-items: start; }

/* ---------- blog list ---------- */
.post-row { display: grid; gap: 6px; padding: 20px 0; border-bottom: 1px solid var(--rule); }
.post-row-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.post-date { font: 500 12.5px/1.4 var(--mono); color: var(--muted); }
.post-title { font: 700 20px/1.25 var(--display); font-stretch: 105%; text-wrap: balance; }
.post-title a { color: var(--ink); text-decoration: none; }
.post-title a:hover { color: var(--petrol); text-decoration: underline; }
.post-summary { max-width: 66ch; color: var(--muted); }

/* ---------- news list ---------- */
.news-row { display: grid; gap: 6px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.news-title { font-weight: 600; line-height: 1.4; }
.news-title a { color: var(--ink); text-decoration: none; }
.news-title a:hover { color: var(--petrol); text-decoration: underline; }
.news-title a::after { content: "\00a0\2197"; color: var(--muted); font-family: var(--mono); font-weight: 400; }
.news-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; font: 500 12.5px/1.4 var(--mono); color: var(--muted); }
.news-note { margin-top: 14px; font: 500 12px/1.5 var(--mono); color: var(--muted); }
.news-page .news-row { grid-template-columns: minmax(0, 1fr) auto; align-items: baseline; gap: 6px 24px; }

/* ---------- article ---------- */
.back { display: inline-block; margin-bottom: 24px; font: 500 12.5px/1.3 var(--mono); letter-spacing: .04em; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-top: 6px; }
.prose { display: grid; gap: 18px; max-width: 68ch; margin-top: 28px; font-size: 17px; line-height: 1.7; }
.prose h2 { margin-top: 18px; font: 800 24px/1.2 var(--display); font-stretch: 110%; letter-spacing: -.01em; }
.prose h3, .prose h4 { margin-top: 8px; font: 700 19px/1.3 var(--display); font-stretch: 105%; }
.prose ul, .prose ol { display: grid; gap: 8px; padding-left: 24px; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li::marker { color: var(--petrol); font-weight: 600; }
.prose code {
  padding: 1px 5px; border: 1px solid var(--rule); border-radius: 3px;
  background: var(--sheet-2); font: 400 .88em/1.5 var(--mono); overflow-wrap: anywhere;
}
.prose pre {
  padding: 16px; overflow-x: auto;
  background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r-md);
}
.prose pre code { padding: 0; border: 0; background: none; overflow-wrap: normal; }
.prose blockquote {
  padding: 14px 18px; border-left: 4px solid var(--petrol); border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--petrol-wash);
}

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--rule); }
.foot-in {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 24px;
  max-width: 1120px; margin: 0 auto; padding: 20px var(--gutter) 28px;
  font: 500 12px/1.5 var(--mono); color: var(--muted);
}

/* ---------- small screens ---------- */
@media (max-width: 860px) {
  .cols { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 620px) {
  .wrap { padding-top: 32px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-name { font-size: 15px; }
  .nav { order: 3; width: 100%; margin-left: -12px; }
  .theme-btn { margin-left: auto; }
  .tip { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .tip-date {
    display: flex; align-items: baseline; gap: 12px;
    padding: 0 0 14px; border-right: 0; border-bottom: 1px solid var(--rule);
  }
  .tip-day { font-size: 44px; }
  .news-page .news-row { grid-template-columns: minmax(0, 1fr); }
}

@media print {
  .top, .foot, .skip { display: none; }
  body { background: #fff; }
}

nav[aria-label="Brief archive"] ul { display: grid; gap: 14px; }
nav[aria-label="Brief archive"] a { overflow-wrap: anywhere; }
nav[aria-label="Brief archive"] time { white-space: nowrap; }