*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.65 var(--font-body);
  /* Layers, top to bottom: three light pools, a veil that fades the pattern out downward from the top centre,
     then a faded pin-tumbler pattern (lock-cylinder pin stacks: spring, driver pin, key pin, dashed shear line). */
  background-image:
    radial-gradient(60rem 30rem at 85% -10%, var(--pool-a), transparent 70%),
    radial-gradient(40rem 26rem at -10% 20%, var(--pool-b), transparent 70%),
    radial-gradient(46rem 30rem at 50% 115%, var(--pool-a), transparent 70%),
    radial-gradient(ellipse 80% 70% at 50% 0%, transparent 0%, color-mix(in srgb, var(--paper) 45%, transparent) 45%, var(--paper) 82%),
    var(--pins);
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat, repeat;
  background-attachment: fixed;
}
body.modal-open { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.08; letter-spacing: -.02em; margin: 0; font-weight: 700; }
h1 { font-size: clamp(2.5rem, 6vw, 4.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.25rem; }
p { margin: 0; }
.mono { font-family: var(--font-mono); font-size: .76rem; letter-spacing: .02em; }
.mute { color: var(--mute); }
.lead { font-size: 1.2rem; color: var(--mute); max-width: 56ch; margin-top: 18px; }
.kicker { text-transform: uppercase; letter-spacing: .12em; color: var(--violet); font-weight: 600; margin-bottom: 14px; display: inline-flex; align-items: center; gap: 8px; }
.kicker::before { content: ''; width: 22px; height: 3px; border-radius: 3px; background: var(--cyan); }
.wrap { width: min(1180px, 100% - 40px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 99px; z-index: 99; }
.skip:focus { left: 12px; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; border-radius: 8px; }
#main { outline: none; }
#main:focus-visible { box-shadow: inset 0 3px 0 var(--cyan); }
em { font-style: normal; color: var(--violet); }
.js .rv { opacity: 0; transform: translateY(16px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.js .rv.in { opacity: 1; transform: none; }
#main.enter { animation: enter .45s var(--ease); }
@keyframes enter { from { opacity: 0; transform: translateY(10px); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } .js .rv { opacity: 1; transform: none; } }

/* Buttons and fields */
.btn { display: inline-flex; align-items: center; gap: 10px; border: 0; border-radius: 99px; padding: 13px 24px; font-weight: 600; transition: transform .2s var(--ease), box-shadow .2s; }
.btn svg { width: 18px; height: 18px; }
.btn:hover { transform: translateY(-2px); }
.btn-solid { background: var(--violet); color: var(--on-violet); box-shadow: 0 10px 24px -10px var(--violet); }
.btn-ghost { background: transparent; border: 1.5px solid var(--line); }
.btn-ghost:hover { border-color: var(--violet); }
.icon-btn { width: 42px; height: 42px; border-radius: 50%; border: 0; background: transparent; display: grid; place-items: center; }
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn:hover { background: var(--paper-2); }
.field { width: 100%; background: var(--card); border: 1.5px solid var(--line); color: inherit; border-radius: var(--r-s); padding: 12px 14px; font: inherit; }
.field:focus { outline: none; border-color: var(--violet); box-shadow: 0 0 0 4px color-mix(in srgb, var(--violet) 22%, transparent); }
.field[aria-invalid='true'] { border-color: var(--c-pink); }
.btn:disabled { opacity: .6; cursor: progress; transform: none; }
textarea.field { resize: vertical; }
.mono-area { font-family: var(--font-mono); font-size: .86rem; line-height: 1.55; }
.lbl { display: block; font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--mute); margin: 18px 0 6px; }
.check { display: flex; gap: 10px; align-items: center; margin-top: 12px; }
.alert { background: rgba(224, 64, 143, .12); border: 1px solid var(--c-pink); border-radius: var(--r-s); padding: 10px 14px; margin: 12px 0; }

/* Key bitting + stage pill */
.bit { display: inline-flex; align-items: flex-end; gap: 2px; height: 16px; }
.bit i { width: 5px; border-radius: 2px 2px 0 0; background: var(--line); }
.bit[data-n='1'] i:nth-child(-n+1), .bit[data-n='2'] i:nth-child(-n+2), .bit[data-n='3'] i:nth-child(-n+3), .bit[data-n='4'] i { background: var(--stc, var(--violet)); }
.bit i:nth-child(1) { height: 7px; } .bit i:nth-child(2) { height: 11px; } .bit i:nth-child(3) { height: 14px; } .bit i:nth-child(4) { height: 16px; }
.bit.lg { height: 34px; gap: 4px; } .bit.lg i { width: 11px; border-radius: 4px 4px 0 0; }
.bit.lg i:nth-child(1) { height: 14px; } .bit.lg i:nth-child(2) { height: 22px; } .bit.lg i:nth-child(3) { height: 29px; } .bit.lg i:nth-child(4) { height: 34px; }
.pill { display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px 5px 10px; border-radius: 99px; background: color-mix(in srgb, var(--stc) 16%, transparent); font-size: .78rem; font-weight: 600; white-space: nowrap; }
.st-concept { --stc: var(--st-concept); } .st-bench { --stc: var(--st-bench); } .st-animals { --stc: var(--st-animals); }
.st-people { --stc: var(--st-people); } .st-approved { --stc: var(--st-approved); }

/* Topic dot */
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--tc, var(--violet)); flex: none; }
.tc-violet { --tc: var(--c-violet); } .tc-cyan { --tc: var(--c-cyan); } .tc-orange { --tc: var(--c-orange); }
.tc-pink { --tc: var(--c-pink); } .tc-green { --tc: var(--c-green); } .tc-yellow { --tc: var(--c-yellow); }

/* Prose */
.prose { font-size: 1.12rem; line-height: 1.75; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2.1em; font-size: 1.7rem; scroll-margin-top: 100px; }
.prose h3 { margin-top: 1.6em; scroll-margin-top: 100px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: .4em; }
.prose a { color: var(--violet); text-decoration: underline; text-underline-offset: 3px; }
.prose blockquote { margin-inline: 0; padding: 14px 20px; background: var(--card); border-left: 5px solid var(--cyan); border-radius: 0 var(--r-s) var(--r-s) 0; }
.prose code { font-family: var(--font-mono); background: var(--paper-2); padding: 2px 6px; border-radius: 6px; font-size: .9em; }
.prose pre { background: var(--card); padding: 16px; border-radius: var(--r-s); overflow: auto; }
.prose hr { border: 0; border-top: 1px solid var(--line); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r-s); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); }
th { font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--mute); }
.narrow { max-width: 68ch; }

/* Toast, search dialog */
#toasts { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); display: grid; gap: 8px; z-index: 80; }
.toast { background: var(--ink); color: var(--paper); padding: 11px 20px; border-radius: 99px; font-size: .92rem; animation: enter .3s var(--ease); }
.sheet { position: fixed; inset: 0; z-index: 70; background: rgba(19, 15, 39, .55); backdrop-filter: blur(6px); padding: 11vh 16px 16px; overflow-y: auto; }
.sheet[hidden] { display: none; }
.sheet-box { width: min(660px, 100%); margin: 0 auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 22px 20px; box-shadow: var(--shadow-lg); }
.sheet-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.sheet-head h2 { font: 600 .76rem var(--font-mono); text-transform: uppercase; letter-spacing: .12em; color: var(--violet); }
.sheet-form { display: flex; gap: 10px; margin-top: 8px; align-items: stretch; }
.sheet-form input { flex: 1; min-width: 0; border: 1.5px solid var(--line); border-radius: var(--r-s); background: var(--paper); color: inherit; font: 600 1.25rem var(--font-display); padding: 10px 14px; }
.sheet-form input:focus { outline: none; border-color: var(--violet); box-shadow: 0 0 0 4px color-mix(in srgb, var(--violet) 22%, transparent); }
.sheet-list { margin-top: 10px; }
.sheet-note { padding: 10px 4px 4px; }
.sheet-list a { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 11px 12px; border-radius: var(--r-s); }
.sheet-list a > span:first-child { display: grid; gap: 1px; min-width: 0; }
.sheet-list a b { font-family: var(--font-display); font-weight: 600; }
.sheet-list a:hover, .sheet-list a:focus-visible { background: var(--paper-2); color: var(--violet); outline-offset: 0; }
.sheet-hint { margin-top: 14px; }

/* Glossary terms inside article text: keyhole tag + key-tag popover */
.prose a.term { color: inherit; text-decoration: none; position: relative; padding: 1px 5px 1px 17px; border-radius: 6px; background: color-mix(in srgb, var(--cyan) 16%, transparent); white-space: nowrap; transition: background .2s; }
.prose a.term::before { content: ''; position: absolute; left: 5px; top: 50%; width: 8px; height: 12px; transform: translateY(-50%); background: var(--c-cyan);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 12'%3E%3Ccircle cx='4' cy='3.6' r='3.4'/%3E%3Cpath d='M2.5 5h3L6.6 12H1.4z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 12'%3E%3Ccircle cx='4' cy='3.6' r='3.4'/%3E%3Cpath d='M2.5 5h3L6.6 12H1.4z'/%3E%3C/svg%3E") center / contain no-repeat; }
.prose a.term:hover, .prose a.term:focus-visible { background: color-mix(in srgb, var(--cyan) 30%, transparent); }
.term-tip { position: fixed; z-index: 90; width: max-content; max-width: min(300px, calc(100vw - 24px)); background: var(--ink); color: var(--paper); padding: 11px 14px 12px 30px; font-size: .86rem; line-height: 1.45; box-shadow: var(--shadow-lg); pointer-events: none;
  clip-path: polygon(14px 0, 100% 0, 100% 100%, 14px 100%, 0 calc(100% - 14px), 0 14px); border-radius: 0 10px 10px 0; }
.term-tip::before { content: ''; position: absolute; left: 10px; top: 50%; width: 8px; height: 8px; margin-top: -4px; border-radius: 50%; background: var(--paper); opacity: .9; }
.term-tip b { display: block; font: 700 .95rem var(--font-display); color: var(--cyan); margin-bottom: 2px; }
.term-tip[hidden] { display: none; }