/* ──────────────────────────────────────────────────────────────
   API SECURITY TRAINING — Light Professional Theme
   Editorial enterprise documentation
   ────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  /* Page surfaces — warm off-white, no dark backgrounds */
  --bg:           #faf9f6;   /* page background — warm cream */
  --bg-alt:       #f5f3ee;   /* secondary band */
  --surface:      #ffffff;   /* cards, callouts */
  --surface-2:    #f7f5f0;   /* code block background */
  --surface-3:    #efece4;   /* table head, hover */

  --border:        #e5e2db;
  --border-bright: #d4d0c5;
  --border-strong: #b8b4a8;

  /* Text */
  --text:        #141413;
  --text-2:      #2c2a26;
  --text-dim:    #6b6760;
  --text-faint:  #9c978c;

  /* Level accents — saturated to read on cream */
  --level-1:      #1d4ed8;
  --level-1-soft: #dbeafe;
  --level-2:      #047857;
  --level-2-soft: #d1fae5;
  --level-3:      #b45309;
  --level-3-soft: #fef3c7;
  --level-4:      #b91c1c;
  --level-4-soft: #fee2e2;
  --bench:        #6d28d9;
  --bench-soft:   #ede9fe;
  --hub:          #a16207;
  --hub-soft:     #fef3c7;

  /* Active level — overridden per page */
  --accent:       var(--hub);
  --accent-soft:  var(--hub-soft);

  /* Typography */
  --font-display: 'Times New Roman', Times, Georgia, serif;
  --font-body:    'Times New Roman', Times, Georgia, serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17.5px;
  line-height: 1.65;
  font-weight: 400;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--accent-soft); color: var(--text); }

/* ─── NAV ─────────────────────────────────────────────────────── */
nav.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 246, 0.88);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 1px;
  transform: rotate(45deg);
}
.brand .brand-light { color: var(--text-dim); font-weight: 400; letter-spacing: 0.02em; }

.nav-links {
  display: flex;
  gap: 2px;
  align-items: center;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 4px;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}
.nav-links a:hover {
  color: var(--text);
  background: var(--surface-3);
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

/* ─── LAYOUT ─────────────────────────────────────────────────── */
.page {
  max-width: 920px;
  margin: 0 auto;
  padding: 56px 32px 120px;
}
.wide { max-width: 1180px; }

/* ─── LEVEL HERO ─────────────────────────────────────────────── */
.level-hero {
  position: relative;
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 56px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  margin-bottom: 28px;
  font-weight: 700;
}

h1.title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(36px, 4.5vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
  color: var(--text);
  max-width: 18ch;
}
h1.title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}

.lede {
  font-family: var(--font-display);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(18px, 1.6vw, 21px);
  line-height: 1.55;
  color: var(--text-2);
  max-width: 680px;
}
.lede em { color: var(--accent); font-style: italic; }

/* ─── SECTIONS ───────────────────────────────────────────────── */
section {
  margin-bottom: 64px;
}

h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 18px;
}
h2 .num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  margin: 32px 0 12px;
  color: var(--text);
}

h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 28px 0 12px;
}

p { margin-bottom: 16px; color: var(--text-2); max-width: 72ch; }
p.dim { color: var(--text-dim); }

strong { color: var(--text); font-weight: 700; }
em { font-style: italic; }

ul, ol { padding-left: 22px; margin-bottom: 16px; }
li { margin-bottom: 8px; max-width: 70ch; color: var(--text-2); }
li::marker { color: var(--accent); }
li strong { color: var(--text); }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); transition: border-bottom-color 0.15s ease; }
a:hover { border-bottom-color: var(--accent); }

/* ─── CALLOUTS ───────────────────────────────────────────────── */
.callout {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 22px 26px;
  margin: 24px 0 32px;
  border-radius: 4px;
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.03);
}
.callout .label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
  display: block;
}
.callout p { margin-bottom: 0; max-width: none; }
.callout p + p { margin-top: 12px; }

.callout.warn    { border-left-color: var(--level-4); background: #fffbf9; }
.callout.warn .label { color: var(--level-4); }

.callout.success { border-left-color: var(--level-2); background: #f9fdfb; }
.callout.success .label { color: var(--level-2); }

.callout.info    { border-left-color: var(--level-1); background: #f8fbfe; }
.callout.info .label { color: var(--level-1); }

/* ─── CODE BLOCKS ────────────────────────────────────────────── */
.code-block {
  position: relative;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 20px 0 28px;
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.03);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  background: var(--surface-3);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}
.code-header .filename {
  color: var(--text);
  font-weight: 700;
}
.code-header .lang {
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 400;
}
.code-header .dots {
  display: inline-flex;
  gap: 6px;
  margin-right: 12px;
}
.code-header .dots span {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--surface-3);
  border: 1px solid var(--border-bright);
}
.code-header .dots span:nth-child(1) { background: #ff6058; border-color: #e0443d; }
.code-header .dots span:nth-child(2) { background: #ffbd2e; border-color: #dea122; }
.code-header .dots span:nth-child(3) { background: #28c941; border-color: #1aab32; }

pre {
  padding: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--text);
  background: var(--surface-2);
}

pre code { font-family: inherit; background: transparent !important; }

/* Prism.js token colors — light theme tuned for cream background */
pre[class*="language-"], code[class*="language-"] {
  background: transparent !important;
  color: var(--text) !important;
  text-shadow: none !important;
  font-family: var(--font-mono) !important;
  font-size: 13px !important;
  line-height: 1.65 !important;
}
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #8a8a8a; font-style: italic; }
.token.punctuation { color: #4a4a4a; }
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol, .token.deleted { color: #b91c1c; }
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin, .token.inserted { color: #047857; }
.token.operator, .token.entity, .token.url, .language-css .token.string, .style .token.string { color: #4a4a4a; }
.token.atrule, .token.attr-value, .token.keyword { color: #6d28d9; }
.token.function, .token.class-name { color: #1d4ed8; }
.token.regex, .token.important, .token.variable { color: #b45309; }
.token.template-string { color: #047857; }
.token.template-punctuation { color: #6d28d9; }
.token.parameter { color: #b45309; }

/* Inline code */
code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent);
  font-weight: 400;
}

/* ─── TABLES ─────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 24px 0;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.03);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--surface);
}

th, td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--text-2);
}

th {
  background: var(--surface-3);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border-bright);
}

tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--bg); }

td.num, th.num {
  font-family: var(--font-mono);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.pill.green { background: var(--level-2-soft); color: var(--level-2); border: 1px solid color-mix(in srgb, var(--level-2) 25%, transparent); }
.pill.red   { background: var(--level-4-soft); color: var(--level-4); border: 1px solid color-mix(in srgb, var(--level-4) 25%, transparent); }
.pill.amber { background: var(--level-3-soft); color: var(--level-3); border: 1px solid color-mix(in srgb, var(--level-3) 25%, transparent); }
.pill.blue  { background: var(--level-1-soft); color: var(--level-1); border: 1px solid color-mix(in srgb, var(--level-1) 25%, transparent); }

/* ─── FOOTER NAV ─────────────────────────────────────────────── */
.footer-nav {
  margin-top: 96px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.footer-nav a {
  flex: 1;
  display: block;
  padding: 24px 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  background: var(--surface);
  transition: all 0.2s ease;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.02);
}
.footer-nav a:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(20, 20, 19, 0.06);
}
.footer-nav a span {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.footer-nav a strong {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.01em;
}
.footer-nav .next { text-align: right; }

/* ─── INDEX-PAGE LEVEL CARDS ─────────────────────────────────── */
.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 28px;
}

.level-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px 28px 28px;
  text-decoration: none;
  color: var(--text);
  overflow: hidden;
  transition: all 0.25s ease;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.03);
}
.level-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--card-color) 0%, transparent 70%);
  opacity: 0.05;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.level-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-color);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.level-card:hover {
  transform: translateY(-3px);
  border-color: var(--card-color);
  box-shadow: 0 8px 24px rgba(20, 20, 19, 0.08);
}
.level-card:hover::before { opacity: 0.1; }
.level-card:hover::after  { opacity: 1; }

.level-card .num {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 56px;
  line-height: 1;
  color: var(--card-color);
  margin-bottom: 18px;
  letter-spacing: -0.04em;
}
.level-card .name {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--text);
}
.level-card .desc {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.55;
  margin-bottom: 22px;
}
.level-card .arrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--card-color);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ─── METRIC CARDS ───────────────────────────────────────────── */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.metric {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 22px;
}
.metric .label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 8px;
}
.metric .value {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 28px;
  color: var(--accent);
  line-height: 1;
}
.metric .unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
  margin-left: 4px;
}

/* ─── ASCII ART / DIAGRAM BLOCKS ─────────────────────────────── */
.ascii-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 22px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-2);
  white-space: pre;
  overflow-x: auto;
  margin: 20px 0;
  box-shadow: 0 1px 2px rgba(20, 20, 19, 0.03);
}
.ascii-block .h { color: var(--accent); font-weight: 700; }

/* ─── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 720px) {
  .nav-inner { padding: 14px 20px; flex-direction: column; gap: 12px; align-items: flex-start; }
  .nav-links { flex-wrap: wrap; }
  .page { padding: 32px 20px 80px; }
  .level-hero { padding: 48px 0 40px; margin-bottom: 40px; }
  .footer-nav { flex-direction: column; }
  .footer-nav .next { text-align: left; }
  pre { font-size: 12px; padding: 16px; }
  th, td { padding: 10px 12px; font-size: 13px; }
  h2 { flex-wrap: wrap; }
}

/* ─── PER-PAGE ACCENT OVERRIDES ──────────────────────────────── */
body.l1 { --accent: var(--level-1); --accent-soft: var(--level-1-soft); }
body.l2 { --accent: var(--level-2); --accent-soft: var(--level-2-soft); }
body.l3 { --accent: var(--level-3); --accent-soft: var(--level-3-soft); }
body.l4 { --accent: var(--level-4); --accent-soft: var(--level-4-soft); }
body.lb { --accent: var(--bench);   --accent-soft: var(--bench-soft); }
body.lh { --accent: var(--hub);     --accent-soft: var(--hub-soft); }