/* ============================================================
   Network Forensics exam notes — styled to match thedevilhunter.dev
   ============================================================ */

/* ---------- fonts (self-hosted, OFL — see assets/fonts) ---------- */
@font-face {
  font-family: "Chakra Petch";
  src: url("assets/fonts/chakra-petch-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Chakra Petch";
  src: url("assets/fonts/chakra-petch-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains-mono-latin-wght-normal.woff2") format("woff2-variations"),
       url("assets/fonts/jetbrains-mono-latin-wght-normal.woff2") format("woff2");
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #050404;
  --bg-1: #0a0808;
  --bg-2: #100c0c;
  --panel: rgba(12, 9, 9, 0.74);
  --panel-solid: rgba(8, 6, 6, 0.93);
  --paper: #f4efe6;
  --text: #ece6dc;
  --muted: #a8a095;
  --faint: #6f675e;
  --red: #e3172f;
  --red-hot: #ff3148;
  --red-deep: #7c0c18;
  --red-glow: rgba(255, 40, 64, 0.45);
  --gold: #d6a656;
  --ok: #7fd48a;
  --info: #8fc2e8;
  --bad: #ff6b7d;
  --line: rgba(255, 255, 255, 0.075);
  --line-2: rgba(255, 255, 255, 0.14);
  --line-red: rgba(227, 23, 47, 0.42);
  --code-bg: rgba(10, 7, 7, 0.92);
  --display: "Chakra Petch", "Segoe UI", system-ui, sans-serif;
  --sans: "Segoe UI", Inter, -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, ui-monospace, SFMono-Regular, Menlo, monospace;
  --jp: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "Noto Serif JP", "Noto Serif CJK JP", "MS Mincho", serif;
  --math: "Cambria Math", Cambria, "STIX Two Text", "Times New Roman", serif;
  --maxw: 1240px;
  --header-h: 72px;
  --chamfer: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  --chamfer-s: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  color-scheme: dark;
}

/* ---------- base ---------- */

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

[hidden] { display: none !important; }

html {
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--red-deep) var(--bg);
  scrollbar-width: thin;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open { overflow: hidden; }

::selection { background: var(--red); color: #fff; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: linear-gradient(var(--red-deep), #3a070d); border-radius: 9px; }
::-webkit-scrollbar-thumb:hover { background: var(--red); }
::highlight(search) { background-color: rgba(255, 49, 72, 0.5); color: #fff; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button, input { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--red-hot);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10001;
  padding: 10px 16px;
  background: var(--red);
  color: #fff;
  font-family: var(--mono);
  font-size: 13px;
  transform: translateY(-160%);
  transition: transform 0.3s var(--ease-out);
}
.skip-link:focus { transform: none; }

/* ---------- world layers ---------- */

/* the shrine still, with a readability veil (a painted gradient while it loads) */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(circle at 62% 40%, rgba(255, 45, 64, 0.6) 0, rgba(227, 23, 47, 0.35) 6%, transparent 22%),
    linear-gradient(180deg, #020101 0%, #0d0306 50%, #170408 64%, #050203 100%);
}
.backdrop picture,
.backdrop img {
  display: block;
  width: 100%;
  height: 100%;
}
.backdrop img {
  object-fit: cover;
  object-position: 58% 50%;
}
.backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(5, 4, 4, 0.5);
}

.site-header, main, .site-footer { position: relative; z-index: 2; }

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 70;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--red-deep), var(--red-hot));
  box-shadow: 0 0 12px var(--red-hot);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
  pointer-events: none;
}

/* ---------- header ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
}
.site-header.scrolled,
.nav-open .site-header {
  background: rgba(7, 5, 5, 0.94);
  border-bottom-color: var(--line);
}
.site-header .inner {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-family: var(--mono);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.brand-mark {
  position: relative;
  flex: none;
  width: 40px;
  height: 40px;
}
.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--line-2);
  transition: transform 0.6s var(--ease-spring);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: var(--red-hot);
  border-right-color: var(--red-deep);
  transform: rotate(-30deg);
}
.brand:hover .brand-mark img { transform: rotate(-10deg) scale(1.06); }
.brand .tld { color: var(--faint); font-weight: 400; }
.brand .name { color: var(--text); }
.brand .cursor-blink {
  display: inline-block;
  width: 9px;
  height: 17px;
  margin-left: 3px;
  background: var(--red);
  vertical-align: -3px;
  animation: blink 1.05s steps(1) infinite;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-size: 13.5px;
}
.site-nav a {
  position: relative;
  padding: 9px 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}
.site-nav a .n {
  margin-right: 6px;
  font-size: 10px;
  color: var(--red);
  opacity: 0.75;
  vertical-align: 1px;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 1px;
  background: var(--red-hot);
  box-shadow: 0 0 8px var(--red-hot);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.35s var(--ease-out);
}
.site-nav a:hover,
.site-nav a.active { color: var(--text); }
.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a.active::after { transform: scaleX(1); }

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.header-status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red-hot);
  box-shadow: 0 0 10px var(--red-hot);
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 2;
  flex: none;
  margin-left: auto;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-2);
  border-radius: 12px;
  background: rgba(10, 8, 8, 0.6);
  color: var(--text);
  cursor: pointer;
}
.nav-toggle span {
  position: absolute;
  left: 13px;
  right: 13px;
  height: 2px;
  background: currentColor;
  transition: transform 0.4s var(--ease-out), opacity 0.2s;
}
.nav-toggle span:nth-child(1) { top: 16px; }
.nav-toggle span:nth-child(2) { top: 22px; right: 19px; }
.nav-toggle span:nth-child(3) { top: 28px; }
.nav-open .nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- layout primitives ---------- */

main {
  flex: 1;
  padding-top: var(--header-h);
  overflow-x: clip;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

.section-head {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin: 96px 0 32px;
}
.brief .section-head { margin-top: 0; }
.section-head .idx {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--red-hot);
  padding-bottom: 8px;
}
.section-head h2 {
  font-family: var(--display);
  font-size: clamp(30px, 4.2vw, 54px);
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  color: var(--paper);
  text-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
}
.section-head .jp {
  font-family: var(--jp);
  font-size: clamp(20px, 2.6vw, 30px);
  color: var(--red-deep);
  padding-bottom: 4px;
}
.section-head .rule {
  flex: 1;
  min-width: 40px;
  height: 1px;
  margin-bottom: 12px;
  background: linear-gradient(90deg, var(--line-red), transparent);
}

/* chamfered buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 15px 26px;
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  background: rgba(10, 8, 8, 0.72);
  border: 1px solid var(--line-2);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  cursor: pointer;
  overflow: hidden;
  transition: color 0.25s, background 0.25s, border-color 0.25s;
}
.btn:hover { border-color: var(--red-hot); color: #fff; }
.btn .arrow { transition: transform 0.35s var(--ease-out); }
.btn:hover .arrow { transform: translateX(5px); }
.btn.primary {
  color: #fff;
  background: var(--red);
  border-color: var(--red);
}
.btn.primary:hover { background: var(--red-hot); border-color: var(--red-hot); }
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  left: -70%;
  width: 45%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: skewX(-20deg);
  opacity: 0;
  pointer-events: none;
}
.btn:hover::after { animation: shine 0.9s var(--ease-out); }

/* HUD corner brackets */
.hud { position: relative; }
.hud::before,
.formula::before,
.key-rule::before,
.q::after,
.folder-card::after,
.file-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  --c: var(--red-hot);
  --s: 14px;
  background:
    linear-gradient(var(--c), var(--c)) top left / var(--s) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top left / 1px var(--s) no-repeat,
    linear-gradient(var(--c), var(--c)) top right / var(--s) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top right / 1px var(--s) no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / var(--s) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / 1px var(--s) no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / var(--s) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / 1px var(--s) no-repeat;
}
.formula::before { --s: 9px; opacity: 0.8; }

/* ---------- page title (hero) ---------- */

.page-title {
  position: relative;
  padding: 76px 0 56px;
}
.page-title > :not(.embers):not(.jp-side) { position: relative; z-index: 1; }
.page-title h1 {
  margin: 24px 0 26px;
  font-family: var(--display);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.015em;
  text-transform: uppercase;
}
.page-title h1 .l1,
.page-title h1 .l2 { display: block; }
.page-title h1 .l1 {
  font-size: clamp(40px, 7.4vw, 108px);
  color: var(--paper);
  text-shadow: 0 6px 40px rgba(0, 0, 0, 0.6);
}
.page-title h1 .l2 {
  margin-top: 12px;
  font-size: clamp(20px, 3.3vw, 46px);
  color: var(--red-hot);
  text-shadow: 0 0 46px rgba(255, 40, 64, 0.4);
}
.page-title .sub {
  max-width: 62ch;
  margin: 0 0 12px;
  font-size: 17px;
  color: #c6beb2;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.8);
}
.page-title .jp-side {
  position: absolute;
  right: 0;
  top: 40px;
  writing-mode: vertical-rl;
  font-family: var(--jp);
  font-size: clamp(64px, 9vw, 130px);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 70, 90, 0.28);
  pointer-events: none;
  user-select: none;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 36px 0 44px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.stat {
  position: relative;
  padding: 24px 22px 20px;
  background: linear-gradient(160deg, rgba(24, 16, 16, 0.86), rgba(9, 7, 7, 0.86));
  border: 1px solid var(--line);
  overflow: hidden;
  transition: border-color 0.3s, transform 0.5s var(--ease-out);
}
.stat:hover { border-color: var(--line-red); transform: translateY(-4px); }
.stat::after,
.glossary > div::after,
.fcard::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(227, 23, 47, 0.28), transparent 70%);
  pointer-events: none;
}
.stat .num {
  font-family: var(--display);
  font-size: clamp(40px, 4.6vw, 64px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.stat .lbl {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.stat .lbl::before { content: "// "; color: var(--red-hot); }

/* a dozen embers drifting up through the title (compositor-only) */
.embers {
  position: absolute;
  inset: 0 -24px;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.embers i {
  position: absolute;
  left: var(--x);
  bottom: -12px;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background: radial-gradient(circle, #ffd29a 0, #ff6a2c 45%, rgba(255, 60, 30, 0) 72%);
  box-shadow: 0 0 8px 2px rgba(255, 90, 40, 0.45);
  opacity: 0;
  animation: ember var(--t) linear var(--dl) infinite;
}

/* ---------- layout: content + question list ---------- */

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 40px;
  align-items: start;
  padding: 8px 0 40px;
}
.post-main { min-width: 0; }

/* ---------- instructions terminal ---------- */

.terminal {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  background: rgba(8, 6, 6, 0.88);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(227, 23, 47, 0.08), 0 0 70px -25px rgba(227, 23, 47, 0.45);
  font-family: var(--mono);
  font-size: 13.5px;
}
.terminal .bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--line);
}
.terminal .dot { width: 11px; height: 11px; border-radius: 50%; }
.terminal .dot.r { background: #d24545; }
.terminal .dot.y { background: #c48f32; }
.terminal .dot.g { background: #3f8a52; }
.terminal .bar .title {
  margin-left: 8px;
  font-size: 12px;
  color: var(--faint);
}
.terminal .body {
  padding: 18px 20px 20px;
  line-height: 1.7;
}
.t-line { white-space: pre-wrap; word-break: break-word; min-height: 1.7em; }
.t-line .p { color: var(--red-hot); }
.t-line .path { color: var(--muted); }
.t-caret {
  display: inline-block;
  width: 8px;
  height: 15px;
  margin-left: 2px;
  background: var(--red-hot);
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}
.instr-list {
  margin: 8px 0 10px;
  list-style: none;
  counter-reset: instr;
}
.instr-list li {
  position: relative;
  margin: 0 0 6px;
  padding-left: 40px;
  color: #d8d0c4;
  counter-increment: instr;
}
.instr-list li::before {
  content: counter(instr, decimal-leading-zero);
  position: absolute;
  left: 0;
  color: var(--red-hot);
}

/* ---------- practice banner, search state ---------- */

.practice {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 0 30px;
  padding: 22px 24px;
  background: var(--panel-solid);
  border: 1px solid var(--line-red);
}
.practice h2 {
  margin-bottom: 4px;
  font-family: var(--display);
  font-size: 26px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--paper);
}
.practice p {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 15px;
}
.practice p strong { color: #fff; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 13px;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
  background: rgba(227, 23, 47, 0.2);
  border: 1px solid var(--line-red);
  clip-path: var(--chamfer-s);
  transition: background 0.2s;
}
.chip:hover { background: var(--red); }
.practice-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.practice-actions .btn { padding: 11px 18px; font-size: 12px; }

.results {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.results:empty { margin: 0; }
.results:not(:empty)::before { content: "// "; color: var(--red-hot); }

.empty {
  margin: 0 0 24px;
  padding: 44px 20px;
  border: 1px dashed var(--line-2);
  background: var(--panel-solid);
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--muted);
  text-align: center;
}

.filtering .page-title,
.filtering #instructions,
.filtering .revision,
.filtering .toc-jump:not(.out) {
  display: none;
}
.filtering .post-layout { padding-top: 32px; }

/* ---------- questions ---------- */

.q {
  position: relative;
  margin: 0 0 28px;
  padding: 36px 40px 40px;
  background: var(--panel-solid);
  border: 1px solid var(--line);
  box-shadow: 0 60px 120px -60px rgba(0, 0, 0, 0.9);
}
.q::after {
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.q:hover::after { opacity: 1; }

.q-head {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.q-badge {
  flex: none;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: 1px solid var(--line-red);
  background: rgba(10, 6, 6, 0.95);
  color: var(--red-hot);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  clip-path: var(--chamfer);
  transition: background 0.3s, color 0.3s;
}
.q:hover .q-badge { background: rgba(227, 23, 47, 0.18); }
.q.is-done .q-badge { background: var(--red); color: #fff; }
.q h3 {
  flex: 1;
  min-width: 0;
  font-family: var(--display);
  font-size: clamp(19px, 2vw, 25px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--paper);
}
.q-kicker {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--red-hot);
}

.done {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line-2);
  background: rgba(10, 8, 8, 0.72);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  clip-path: var(--chamfer-s);
  cursor: pointer;
  user-select: none;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.done:hover { color: #fff; border-color: var(--red-hot); }
.done input {
  display: grid;
  place-items: center;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--line-2);
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
.done input::after {
  content: "";
  width: 7px;
  height: 4px;
  margin-top: -2px;
  border: 2px solid #fff;
  border-top: 0;
  border-right: 0;
  transform: rotate(-45deg);
  visibility: hidden;
}
.done input:checked { background: var(--red); border-color: var(--red); }
.done input:checked::after { visibility: visible; }
.q.is-done .done {
  color: #fff;
  border-color: var(--line-red);
  background: rgba(227, 23, 47, 0.14);
}

.scenario {
  margin-top: 24px;
  padding: 16px 22px 18px;
  color: #c6beb2;
  background: linear-gradient(90deg, rgba(227, 23, 47, 0.1), rgba(255, 255, 255, 0.02));
  border-left: 3px solid var(--red-hot);
}
.scenario::before {
  content: "Scenario";
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.scenario p { margin: 0 0 10px; }
.scenario > :last-child { margin-bottom: 0; }

.sub { margin-top: 32px; }
.sq {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
  font-family: var(--sans);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
}
.letter {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-top: -2px;
  border: 1px solid var(--line-red);
  background: rgba(10, 6, 6, 0.95);
  color: var(--red-hot);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  clip-path: var(--chamfer-s);
}
.marks {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 8px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 3px;
  vertical-align: 1px;
}

.ans {
  position: relative;
  margin-left: 44px;
  padding: 16px 22px 18px;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--line);
  color: #d9d2c6;
  transition: filter 0.25s var(--ease), opacity 0.25s var(--ease);
}
.ans::before {
  content: "▸ Answer";
  display: block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.ans > :last-child { margin-bottom: 0; }
.ans p { margin: 0 0 10px; }
.ans strong { color: #fff; font-weight: 600; }
.ans ul,
.ans ol { margin: 0 0 12px; padding-left: 24px; }
.ans li { margin: 0.35em 0; padding-left: 4px; }
.ans li::marker { color: var(--red-hot); }
.ans ol > li::marker { font-family: var(--mono); font-size: 0.86em; }

/* OSCAR as a kill chain */
.ans ol.acronym {
  position: relative;
  margin: 6px 0 4px;
  padding: 0;
  list-style: none;
}
.ans ol.acronym::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(var(--red-hot), var(--red));
  box-shadow: 0 0 10px var(--red-hot);
}
.ans ol.acronym > li {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  margin: 0 0 12px;
  padding: 0;
}
.ans ol.acronym > li:last-child { margin-bottom: 0; }
.acronym b {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-red);
  background: rgba(10, 6, 6, 0.98);
  color: var(--red-hot);
  font-family: var(--display);
  font-size: 19px;
  font-weight: 700;
  clip-path: var(--chamfer);
  transition: background 0.3s, color 0.3s;
}
.ans ol.acronym > li:hover b { background: var(--red); color: #fff; }

.ans .note {
  margin: 14px 0 12px;
  padding: 12px 18px;
  color: #ddd3c3;
  background: linear-gradient(90deg, rgba(214, 166, 86, 0.12), rgba(255, 255, 255, 0.02));
  border-left: 3px solid var(--gold);
}
.ans .note > strong:first-child { color: var(--gold); }

.ans p.result {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(227, 23, 47, 0.16);
  border: 1px solid var(--line-red);
  clip-path: var(--chamfer-s);
}

.mono-line {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: #ffb3bd;
}

/* ---------- code, evidence, tables ---------- */

code {
  padding: 2px 6px;
  font-family: var(--mono);
  font-size: 0.86em;
  color: #ffb3bd;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow-wrap: anywhere;
}

kbd {
  display: inline-block;
  padding: 3px 7px;
  font-family: var(--mono);
  font-size: 0.78em;
  line-height: 1.2;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line-2);
  border-radius: 3px;
  white-space: nowrap;
}
.menu-path {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  color: var(--red-hot);
}
p.menu-path { display: flex; }

.term {
  position: relative;
  overflow: hidden;
  margin: 14px 0 16px;
  background: var(--code-bg);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  box-shadow: 0 24px 50px -30px rgba(0, 0, 0, 0.9);
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px 8px 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--line);
}
.term-bar i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #d24545;
}
.term-bar i:nth-child(2) { background: #c48f32; }
.term-bar i:nth-child(3) { background: #3f8a52; }
.term-bar span { margin-left: 8px; }
.copy-btn {
  margin-left: auto;
  padding: 3px 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line-2);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, transform 0.15s;
}
.copy-btn:hover { color: #fff; border-color: var(--red-hot); }
.copy-btn:active { transform: scale(0.92); }
.copy-btn.copied { color: var(--ok); border-color: #3f8a52; }
.term pre {
  margin: 0;
  padding: 16px 18px;
  font-family: var(--mono);
  font-size: 13.6px;
  line-height: 1.6;
  color: #e2dccf;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.term.log pre {
  overflow-x: auto;
  font-size: 13px;
  white-space: pre;
  overflow-wrap: normal;
}
.term pre code {
  padding: 0;
  color: inherit;
  font-size: inherit;
  background: none;
  border: 0;
  border-radius: 0;
  overflow-wrap: inherit;
}

/* evidence log tokens, on the portfolio's syntax palette */
.t-key { color: var(--muted); }
.t-time { color: #8fc2e8; }
.t-ip { color: #e2b04a; }
.t-arrow { color: var(--faint); }
.t-method { color: #ff6b7d; font-weight: 600; }
.t-flag { color: #ff8e9c; font-weight: 600; }
.t-bad { color: var(--red-hot); font-weight: 600; }
.t-good { color: var(--ok); font-weight: 600; }
.t-domain { color: #b4d48f; }
.t-status { font-weight: 700; }
.t-status.s2 { color: var(--ok); }
.t-status.s3 { color: var(--info); }
.t-status.s4,
.t-status.s5 { color: var(--bad); }

.table-wrap {
  overflow-x: auto;
  margin: 14px 0 16px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  line-height: 1.5;
}
th,
td {
  padding: 9px 14px;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--line-2);
}
thead th {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--red-hot);
  background: rgba(227, 23, 47, 0.08);
}
tbody th {
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
}
tbody tr:nth-child(even) > * { background: rgba(255, 255, 255, 0.015); }
.table-wrap.data tbody td,
.table-wrap.data tbody th {
  font-family: var(--mono);
  font-size: 13px;
}

.pill {
  display: inline-block;
  padding: 3px 9px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 3px;
}
.pill.ok { color: var(--ok); border-color: rgba(127, 212, 138, 0.3); }
.pill.bad { color: var(--bad); border-color: rgba(255, 107, 125, 0.32); }

.status {
  display: inline-block;
  padding: 1px 7px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid currentColor;
  border-radius: 3px;
}
.status.s2 { color: var(--ok); background: rgba(127, 212, 138, 0.08); }
.status.s3 { color: var(--info); background: rgba(143, 194, 232, 0.08); }
.status.s4 { color: var(--bad); background: rgba(255, 107, 125, 0.08); }

.formula {
  position: relative;
  overflow-x: auto;
  margin: 14px 0 16px;
  padding: 16px 18px;
  font-family: var(--math);
  font-size: 1.15rem;
  line-height: 1.6;
  text-align: center;
  color: var(--paper);
  background: var(--code-bg);
  border: 1px solid var(--line-2);
}
.formula strong { color: #fff; }
.frac {
  display: inline-flex;
  flex-direction: column;
  margin: 0 0.15em;
  line-height: 1.3;
  text-align: center;
  vertical-align: middle;
}
.frac > span:first-child {
  padding: 0 0.4em 0.12em;
  border-bottom: 1.5px solid currentColor;
}
.frac > span:last-child { padding: 0.12em 0.4em 0; }
.boxed {
  display: inline-block;
  padding: 0.05em 0.5em;
  color: #fff;
  font-weight: 700;
  background: rgba(227, 23, 47, 0.16);
  border: 1px solid var(--red-hot);
  box-shadow: 0 0 18px -4px var(--red-glow);
}

.beacon {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin: 8px 0 16px;
  padding: 14px 4px 2px;
}
.beacon::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 19px;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line-red) 0 6px, transparent 6px 11px);
}
.beacon span {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
}
.beacon span::before {
  content: "";
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--red-hot);
  box-shadow: 0 0 12px var(--red-hot);
}

/* ---------- self-test (hide answers) ---------- */

.quiz .sub:not(.shown) { cursor: pointer; }
.quiz .sub:not(.shown) .ans {
  filter: blur(8px);
  opacity: 0.45;
  pointer-events: none;
  user-select: none;
}
.quiz .sub:not(.shown) .sq::after {
  content: "Show answer";
  flex: none;
  align-self: center;
  margin-left: auto;
  padding: 6px 11px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #fff;
  background: var(--red);
  clip-path: var(--chamfer-s);
}
.quiz .sub:not(.shown):hover .sq::after { background: var(--red-hot); }

/* ---------- final revision ---------- */

.revision > p {
  margin-bottom: 18px;
  color: #c6beb2;
}

.glossary {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 56px;
}
.glossary > div,
.fcard {
  position: relative;
  overflow: hidden;
  padding: 18px 18px 16px;
  background: linear-gradient(160deg, rgba(24, 16, 16, 0.86), rgba(9, 7, 7, 0.86));
  border: 1px solid var(--line);
  transition: border-color 0.3s, transform 0.5s var(--ease-out);
}
.glossary > div:hover,
.fcard:hover {
  border-color: var(--line-red);
  transform: translateY(-4px);
}
.glossary dt {
  font-family: var(--display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--paper);
}
.glossary dd {
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--muted);
}

.rev-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  font-family: var(--display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
  color: var(--paper);
}
.rev-title::before {
  content: "";
  flex: none;
  width: 34px;
  height: 1px;
  background: var(--red-hot);
  box-shadow: 0 0 8px var(--red-hot);
}

.formula-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 56px;
}
.fcard h4 {
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.fcard .formula {
  margin: 0;
  font-size: 1.02rem;
  background: rgba(5, 4, 4, 0.6);
}

/* "How to answer" as the method kill chain */
.method {
  position: relative;
  margin: 8px 0 28px;
  padding: 0;
  list-style: none;
  counter-reset: method;
}
.method::before {
  content: "";
  position: absolute;
  left: 23px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(var(--red-hot), var(--red));
  box-shadow: 0 0 10px var(--red-hot);
}
.method li {
  position: relative;
  min-height: 48px;
  padding: 2px 0 26px 68px;
  font-size: 15.5px;
  color: var(--muted);
  counter-increment: method;
}
.method li:last-child { padding-bottom: 0; }
.method li::before {
  content: counter(method, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line-red);
  background: rgba(10, 6, 6, 0.98);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--red-hot);
  clip-path: var(--chamfer);
  transition: background 0.3s, color 0.3s;
}
.method li:hover::before { background: var(--red); color: #fff; }
.method strong {
  display: block;
  margin-bottom: 2px;
  font-family: var(--display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--paper);
}

.key-rule {
  position: relative;
  margin-bottom: 24px;
  padding: 20px 24px;
  color: var(--text);
  background: linear-gradient(90deg, rgba(227, 23, 47, 0.14), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--line-red);
}
.key-rule > strong:first-child {
  font-family: var(--mono);
  font-size: 0.86em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.revision > p.closing { color: var(--muted); }

/* ---------- question list (right column / drawer) ---------- */

.toc {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--red-deep) transparent;
  padding: 20px 20px 18px;
  font-size: 13.5px;
  background: rgba(8, 6, 6, 0.9);
  border: 1px solid var(--line);
}
.toc-title {
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.toc-block { margin-bottom: 18px; }
.toc-count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.toc-count strong {
  margin-right: 6px;
  font-family: var(--display);
  font-size: 22px;
  font-weight: 700;
  color: var(--paper);
}
.toc-bar {
  height: 2px;
  margin: 10px 0 6px;
  background: var(--line-2);
}
.toc-bar span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--red-deep), var(--red-hot));
  box-shadow: 0 0 10px var(--red-hot);
  transition: width 0.45s var(--ease-out);
}

.search { position: relative; margin-bottom: 10px; }
.search > svg {
  position: absolute;
  left: 11px;
  top: 50%;
  width: 15px;
  height: 15px;
  transform: translateY(-50%);
  fill: none;
  stroke: var(--faint);
  stroke-width: 2;
  stroke-linecap: round;
  pointer-events: none;
}
.search input {
  width: 100%;
  padding: 9px 30px 9px 34px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line-2);
  border-radius: 0;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search input::placeholder { color: var(--faint); }
.search input:focus {
  border-color: var(--red-hot);
  box-shadow: 0 0 0 3px rgba(255, 49, 72, 0.15);
}
.search kbd {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  pointer-events: none;
}
.search input:focus ~ kbd,
.search input:not(:placeholder-shown) ~ kbd { display: none; }

.toc-tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 20px;
}
.tool-btn {
  padding: 9px 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(10, 8, 8, 0.72);
  border: 1px solid var(--line-2);
  clip-path: var(--chamfer-s);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.tool-btn:hover { color: #fff; border-color: var(--red-hot); }
.tool-btn[aria-pressed="true"] {
  color: #fff;
  background: var(--red);
  border-color: var(--red);
}

.toc-group h2 {
  margin: 16px 0 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faint);
}
.toc ol { list-style: none; }
#toc-list a {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) 12px;
  gap: 4px;
  align-items: start;
  margin-left: -12px;
  padding: 5px 0 5px 12px;
  color: var(--muted);
  line-height: 1.4;
  border-left: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
#toc-list a:hover { color: var(--text); }
#toc-list a.active { color: #fff; border-left-color: var(--red-hot); }
#toc-list .n {
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--red);
}
.tick svg {
  width: 11px;
  height: 11px;
  margin-top: 4px;
  fill: none;
  stroke: var(--red-hot);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  visibility: hidden;
}
#toc-list a.done .tick svg { visibility: visible; }
#toc-list a.done .t { color: var(--faint); }
#toc-list a.done.active .t { color: #fff; }

.toc-jump {
  display: block;
  padding: 6px 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}
.toc-jump::before { content: "→ "; color: var(--red-hot); }
.toc-jump:hover { color: #fff; }
#toc-list + .toc-jump { margin-top: 12px; }

.linkish {
  padding: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  background: none;
  border: 0;
  cursor: pointer;
  transition: color 0.2s;
}
.linkish:hover { color: var(--red-hot); }

/* ---------- footer ---------- */

.site-footer {
  margin-top: 40px;
  overflow: clip;
  background: linear-gradient(180deg, transparent, rgba(5, 4, 4, 0.92) 30%);
}
.site-footer .inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 24px 34px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--faint);
}
.site-footer .kanji { font-family: var(--jp); font-size: 20px; color: var(--red); }
.site-footer .links { margin-left: auto; display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.site-footer .links a { text-transform: uppercase; letter-spacing: 0.12em; transition: color 0.2s; }
.site-footer .links a:hover { color: var(--red-hot); }
.site-footer .linkish { font-size: 12.5px; }
.to-top {
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line-2);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.to-top:hover { color: #fff; border-color: var(--red-hot); }

.float-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 50;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-family: var(--mono);
  font-size: 18px;
  color: #fff;
  background: rgba(10, 8, 8, 0.85);
  border: 1px solid var(--line-red);
  clip-path: var(--chamfer);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  translate: 0 12px;
  transition: opacity 0.25s, translate 0.25s var(--ease-out), background 0.2s;
}
.float-top.show { opacity: 1; pointer-events: auto; translate: none; }
.float-top:hover { background: var(--red); }

/* ---------- breadcrumbs ---------- */

.crumbs {
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--faint);
  overflow-wrap: anywhere;
}
.crumbs a { color: var(--red-hot); }
.crumbs a:hover { text-decoration: underline; }

/* ---------- notes home: folders and files ---------- */

.hub-main { padding-bottom: 80px; }
.hub-main .section-head { margin-top: 24px; }

.folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: 20px;
}
.folder-card,
.file-card {
  position: relative;
  border: 1px solid var(--line);
  transition: border-color 0.3s, transform 0.5s var(--ease-out);
}
.folder-card::after,
.file-card::after {
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.folder-card:hover::after,
.file-card:hover::after,
.folder-card:focus-visible::after,
.file-card:focus-visible::after { opacity: 1; }
.folder-card:hover,
.file-card:hover { border-color: var(--line-red); }

.folder-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 240px;
  padding: 26px 26px 22px;
  background: linear-gradient(160deg, rgba(24, 16, 16, 0.92), rgba(9, 7, 7, 0.92));
}
.folder-card:hover { transform: translateY(-4px); }
.folder-icon svg {
  width: 50px;
  height: 50px;
  fill: rgba(227, 23, 47, 0.12);
  stroke: var(--red-hot);
  stroke-width: 1.5;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 10px rgba(255, 49, 72, 0.35));
}
.folder-kicker,
.file-kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.folder-kicker { margin-top: 16px; }
.folder-name {
  font-family: var(--display);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.05;
  text-transform: uppercase;
  color: var(--paper);
}
.folder-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.folder-kanji {
  position: absolute;
  right: 18px;
  top: 16px;
  writing-mode: vertical-rl;
  font-family: var(--jp);
  font-size: 54px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 70, 90, 0.28);
  pointer-events: none;
}
.folder-go,
.file-go {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}
.folder-go { margin-top: auto; padding-top: 18px; }
.folder-go .arrow,
.file-go .arrow { display: inline-block; transition: transform 0.35s var(--ease-out); }
.folder-card:hover .folder-go,
.file-card:hover .file-go { color: var(--red-hot); }
.folder-card:hover .arrow,
.file-card:hover .arrow { transform: translateX(5px); }

.file-list { display: grid; gap: 14px; }
.file-card {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 22px 24px;
  background: var(--panel-solid);
}
.file-card:hover { transform: translateX(4px); }
.file-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border: 1px solid var(--line-red);
  background: rgba(10, 6, 6, 0.95);
  clip-path: var(--chamfer);
}
.file-icon svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--red-hot);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.file-body { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.file-name {
  font-family: var(--display);
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.15;
  text-transform: uppercase;
  color: var(--paper);
}
.file-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }

/* ---------- lock screen ---------- */

.vault {
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 40px 16px;
}
.vault-card {
  position: relative;
  width: min(100%, 460px);
  padding: 32px 32px 30px;
  background: var(--panel-solid);
  border: 1px solid var(--line-2);
  box-shadow: 0 60px 120px -60px rgba(0, 0, 0, 0.9), 0 0 80px -30px rgba(227, 23, 47, 0.5);
}
.vault-checking .vault-card { visibility: hidden; }
.vault-card .brand { margin-bottom: 28px; font-size: 14px; }
.vault-card h1 {
  margin: 14px 0 10px;
  font-family: var(--display);
  font-size: clamp(46px, 11vw, 70px);
  font-weight: 700;
  line-height: 0.9;
  text-transform: uppercase;
  color: var(--paper);
  text-shadow: 0 0 46px rgba(255, 40, 64, 0.35);
}
.vault-sub {
  margin-bottom: 16px;
  font-size: 15px;
  color: var(--muted);
}
.vault-card .t-line {
  margin-bottom: 18px;
  font-family: var(--mono);
  font-size: 13px;
  color: #d8d0c4;
}
.vault-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red-hot);
}
.vault-input {
  width: 100%;
  padding: 13px 14px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line-2);
  border-radius: 0;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.vault-input:focus {
  border-color: var(--red-hot);
  box-shadow: 0 0 0 3px rgba(255, 49, 72, 0.15);
}
.vault-remember {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0 22px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
}
.vault-remember input {
  display: grid;
  place-items: center;
  width: 15px;
  height: 15px;
  margin: 0;
  border: 1px solid var(--line-2);
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
.vault-remember input::after {
  content: "";
  width: 7px;
  height: 4px;
  margin-top: -2px;
  border: 2px solid #fff;
  border-top: 0;
  border-right: 0;
  transform: rotate(-45deg);
  visibility: hidden;
}
.vault-remember input:checked { background: var(--red); border-color: var(--red); }
.vault-remember input:checked::after { visibility: visible; }
.vault-card .btn { width: 100%; justify-content: center; }
.vault-card .btn:disabled { opacity: 0.7; cursor: progress; }
.vault-error {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--bad);
}
.vault-kanji {
  position: absolute;
  right: 20px;
  top: 22px;
  font-family: var(--jp);
  font-size: 66px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 70, 90, 0.3);
  pointer-events: none;
  user-select: none;
}
.shake { animation: shake 0.42s var(--ease-out); }

/* ---------- keyframes ---------- */

@keyframes shake {
  20% { translate: -8px 0; }
  40% { translate: 7px 0; }
  60% { translate: -5px 0; }
  80% { translate: 3px 0; }
}

@keyframes blink { 50% { opacity: 0; } }
@keyframes ember {
  0% { opacity: 0; transform: translate3d(0, 0, 0); }
  12% { opacity: 0.9; }
  70% { opacity: 0.55; }
  100% { opacity: 0; transform: translate3d(var(--dx, 20px), -92vh, 0); }
}
@keyframes shine { 0% { left: -70%; opacity: 0; } 20% { opacity: 1; } 100% { left: 130%; opacity: 0; } }

/* ---------- motion: reveals gated behind .js, fail-open via .no-anim ---------- */

.js .q,
.js .reveal {
  opacity: 0;
  translate: 0 22px;
  transition: opacity 0.6s var(--ease-out), translate 0.6s var(--ease-out);
}
.js .q.in,
.js .reveal.in { opacity: 1; translate: none; }
.no-anim .q,
.no-anim .reveal { opacity: 1 !important; translate: none !important; }

/* ---------- responsive ---------- */

@media (max-width: 1060px) {
  .post-layout { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle { display: block; }
  .site-nav { margin-left: auto; }
  .site-nav + .header-status + .nav-toggle { margin-left: 0; }

  /* the question list becomes a full-screen panel that circles open from the toggle */
  .toc {
    position: fixed;
    inset: 0;
    z-index: 55;
    max-height: none;
    padding: calc(var(--header-h) + 18px) 24px 40px;
    font-size: 15px;
    background:
      radial-gradient(circle at 100% 0%, rgba(227, 23, 47, 0.22), transparent 55%),
      rgba(5, 4, 4, 0.97);
    border: 0;
    clip-path: circle(0% at calc(100% - 47px) 36px);
    visibility: hidden;
    transition: clip-path 0.75s var(--ease-in-out), visibility 0s linear 0.75s;
  }
  .nav-open .toc {
    clip-path: circle(150% at calc(100% - 47px) 36px);
    visibility: visible;
    transition: clip-path 0.75s var(--ease-in-out), visibility 0s;
  }
  .toc > * { max-width: 560px; }
}

@media (max-width: 1020px) {
  .header-status { display: none; }
}

@media (max-width: 860px) {
  .site-nav { display: none; }
  .site-nav.always { display: flex; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .formula-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .page-title { padding: 52px 0 40px; }
  .page-title .jp-side { opacity: 0.45; font-size: 64px; top: 20px; }
  .cta-row { margin: 28px 0 34px; }
  .cta-row .btn { flex: 1 1 auto; justify-content: center; }
  .section-head { margin-top: 72px; }
  .q { padding: 26px 18px 28px; margin-left: -8px; margin-right: -8px; }
  .q-head { gap: 14px; }
  .q-badge { width: 46px; height: 46px; font-size: 13.5px; }
  .done { padding: 8px; }
  .done span { display: none; }
  .scenario { padding: 14px 16px 16px; }
  .ans { margin-left: 0; padding: 14px 16px 16px; }
  .term.log pre { font-size: 12px; }
  .quiz .sub:not(.shown) .sq { flex-wrap: wrap; }
  .quiz .sub:not(.shown) .sq > span:last-child { flex: 1 1 calc(100% - 44px); }
  .quiz .sub:not(.shown) .sq::after { margin-left: 44px; }
  .float-top { right: 14px; bottom: 14px; }
}

@media (max-width: 560px) {
  .site-nav.always { display: none; }
  .file-card { grid-template-columns: 46px minmax(0, 1fr); gap: 14px; padding: 18px; }
  .file-icon { width: 46px; height: 46px; }
  .file-go { display: none; }
  .vault-card { padding: 28px 22px 24px; }
}

@media (max-width: 480px) {
  .site-header .inner { padding: 0 16px; gap: 12px; }
  .brand { font-size: 13.5px; gap: 10px; }
  .brand-mark { width: 34px; height: 34px; }
  .wrap { padding: 0 16px; }
  .toc { clip-path: circle(0% at calc(100% - 39px) 36px); padding-left: 18px; padding-right: 18px; }
  .nav-open .toc { clip-path: circle(150% at calc(100% - 39px) 36px); }
}

@media (pointer: coarse) {
  .search kbd { display: none; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
  .js .q,
  .js .reveal { opacity: 1 !important; translate: none !important; }
  .embers { display: none !important; }
}

/* ---------- print ---------- */

@media print {
  :root {
    --paper: #000 !important;
    --text: #111 !important;
    --muted: #444 !important;
    --faint: #666 !important;
    --line: #ccc !important;
    --line-2: #bbb !important;
    --code-bg: #f6f6f6 !important;
    --panel-solid: #fff !important;
  }
  html, body { background: #fff; color: #111; }
  .backdrop,
  .progress-bar,
  .site-header,
  .embers,
  .jp-side,
  .cta-row,
  .stats,
  .toc,
  .practice,
  .results,
  .copy-btn,
  .done,
  .site-footer,
  .float-top,
  .skip-link { display: none !important; }
  main { padding-top: 0; }
  .post-layout { display: block; }
  .page-title { padding: 0 0 20px; }
  .page-title h1 .l2 { color: #b0101f; text-shadow: none; }
  .page-title .sub, .scenario, .ans, .ans strong, .ans .note, .formula, .instr-list li { color: #111; text-shadow: none; }
  .q, .terminal, .term, .glossary > div, .fcard, .key-rule { box-shadow: none; background: #fff; }
  .term pre { color: #111; }
  .js .q, .js .reveal { opacity: 1 !important; translate: none !important; }
  .sub { break-inside: avoid; }
  .quiz .sub .ans { filter: none !important; opacity: 1 !important; }
  .quiz .sub .sq::after { display: none !important; }
}