/* SightMetric — shared styles.
   Palette taken from the ISSF target face: paper, aiming-mark black, printed
   ring grey, and the blue a hold trace is drawn in on an electronic target. */

:root {
  --paper:      #F7F6F3;
  --surface:    #FFFFFF;
  --ink:        #101215;
  --graphite:   #5D6167;
  --rule:       #D6D3CC;
  --trace:      #0E6BA8;
  --trace-soft: #E6EEF6;
  --warn:       #A8501C;

  --measure: 66ch;
  --step--1: clamp(0.78rem, 0.76rem + 0.1vw, 0.84rem);
  --step-0:  clamp(1rem, 0.97rem + 0.15vw, 1.09rem);
  --step-1:  clamp(1.25rem, 1.18rem + 0.35vw, 1.5rem);
  --step-2:  clamp(1.6rem, 1.45rem + 0.75vw, 2.2rem);
  --step-3:  clamp(2.1rem, 1.75rem + 1.7vw, 3.4rem);

  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --cond: "IBM Plex Sans Condensed", "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:      #0E1013;
    --surface:    #161A1F;
    --ink:        #ECEDEA;
    --graphite:   #9BA2AA;
    --rule:       #2B3138;
    --trace:      #57A6E4;
    --trace-soft: #14202B;
    --warn:       #D98A55;
  }
}
:root[data-theme="dark"] {
  --paper:      #0E1013;
  --surface:    #161A1F;
  --ink:        #ECEDEA;
  --graphite:   #9BA2AA;
  --rule:       #2B3138;
  --trace:      #57A6E4;
  --trace-soft: #14202B;
  --warn:       #D98A55;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(100% - 2.5rem, 68rem); margin-inline: auto; }
.prose { max-width: var(--measure); }

h1, h2, h3 { font-family: var(--cond); font-weight: 600; line-height: 1.1;
             text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: var(--step-3); }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }
p  { margin: 0; }

a { color: var(--trace); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--trace); outline-offset: 3px; border-radius: 2px;
}

/* A hairline rule, echoing a printed ring line. */
.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

.eyebrow {
  font-family: var(--mono); font-size: var(--step--1);
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--graphite);
}
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

section { padding-block: clamp(3rem, 7vw, 5.5rem); }
.stack   { display: flex; flex-direction: column; gap: 1.25rem; }
.stack-l { display: flex; flex-direction: column; gap: 2.5rem; }

/* Header */
.site-head { position: sticky; top: 0; z-index: 10; background: var(--paper);
             border-bottom: 1px solid var(--rule); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between;
                   gap: 1rem; padding-block: 0.9rem; }
.brand { font-family: var(--cond); font-weight: 600; font-size: 1.1rem;
         letter-spacing: -0.01em; color: var(--ink); text-decoration: none;
         display: flex; align-items: center; gap: 0.55rem; }
.brand-mark { width: 15px; height: 15px; border-radius: 50%; background: var(--ink);
              box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px var(--rule); flex: none; }
.nav { display: flex; gap: 1.4rem; font-size: var(--step--1); }
.nav a { color: var(--graphite); text-decoration: none; }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero { display: grid; gap: clamp(2rem, 5vw, 4rem); align-items: center;
        grid-template-columns: 1fr; padding-block: clamp(3rem, 8vw, 6rem); }
@media (min-width: 62rem) { .hero { grid-template-columns: 1.05fr 0.95fr; } }
.hero-target { width: min(100%, 26rem); margin-inline: auto; }
.lede { font-size: var(--step-1); color: var(--graphite); max-width: 34ch; }

/* Measurement callout — the page's one loud moment */
.thesis { border-left: 2px solid var(--trace); padding-left: 1.15rem;
          display: flex; flex-direction: column; gap: 0.3rem; }
.thesis .figure { font-family: var(--mono); font-size: var(--step-2);
                  font-variant-numeric: tabular-nums; letter-spacing: -0.02em; }

/* Spec table */
.specs { width: 100%; border-collapse: collapse; font-size: var(--step--1); }
.specs th, .specs td { text-align: left; padding: 0.7rem 0.9rem 0.7rem 0;
                       border-bottom: 1px solid var(--rule); vertical-align: baseline; }
.specs th { font-family: var(--mono); text-transform: uppercase;
            letter-spacing: 0.1em; color: var(--graphite); font-weight: 400; }
.specs td.num { font-family: var(--mono); font-variant-numeric: tabular-nums;
                white-space: nowrap; }
.scroll-x { overflow-x: auto; }

/* Cards */
.grid { display: grid; gap: 1.5rem; grid-template-columns: 1fr; }
@media (min-width: 46rem) { .grid-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 62rem) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--rule);
        padding: 1.5rem; display: flex; flex-direction: column; gap: 0.6rem; }
.card h3 { font-size: var(--step-1); }
.card p { color: var(--graphite); font-size: var(--step--1); }
.card .metric { font-family: var(--mono); font-size: var(--step--1);
                color: var(--trace); letter-spacing: 0.02em; }

/* Honesty note */
.note { background: var(--trace-soft); border: 1px solid var(--rule);
        padding: 1.5rem; display: flex; flex-direction: column; gap: 0.7rem; }
.note strong { font-family: var(--cond); font-size: var(--step-1); font-weight: 600; }

/* Form */
.form { display: flex; flex-direction: column; gap: 0.8rem; max-width: 30rem; }
.form-row { display: flex; gap: 0.6rem; flex-wrap: wrap; }
input[type="email"], input[type="text"] {
  flex: 1 1 15rem; padding: 0.75rem 0.9rem; font: inherit; font-size: var(--step--1);
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--rule); border-radius: 0;
}
.btn { padding: 0.75rem 1.4rem; font-family: var(--cond); font-size: var(--step-0);
       font-weight: 600; color: var(--paper); background: var(--ink);
       border: 1px solid var(--ink); border-radius: 0; cursor: pointer; }
.btn:hover { background: var(--trace); border-color: var(--trace); }
.hp { position: absolute; left: -9999px; }

/* Gear */
.gear { display: flex; flex-direction: column; gap: 0; }
.gear-item { display: grid; gap: 0.3rem 1.5rem; padding-block: 1.2rem;
             border-bottom: 1px solid var(--rule); grid-template-columns: 1fr; }
@media (min-width: 46rem) { .gear-item { grid-template-columns: 12rem 1fr auto;
                                          align-items: baseline; } }
.gear-item h3 { font-size: var(--step-0); }
.gear-item p { color: var(--graphite); font-size: var(--step--1); }
.gear-item .req { font-family: var(--mono); font-size: var(--step--1);
                  color: var(--trace); white-space: nowrap; }

/* Footer */
.site-foot { border-top: 1px solid var(--rule); padding-block: 2.5rem 3.5rem;
             color: var(--graphite); font-size: var(--step--1); }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem;
                   justify-content: space-between; align-items: baseline; }
.site-foot a { color: var(--graphite); }
.disclosure { max-width: var(--measure); font-size: var(--step--1);
              color: var(--graphite); }

/* Document pages */
.doc h2 { margin-top: 2.5rem; font-size: var(--step-1); }
.doc h2:first-of-type { margin-top: 0; }
.doc p, .doc li { color: var(--graphite); }
.doc ul { padding-left: 1.1rem; display: flex; flex-direction: column; gap: 0.5rem;
          margin: 0; }
.doc dl { display: grid; gap: 0.6rem 1.5rem; margin: 0; grid-template-columns: 1fr; }
@media (min-width: 46rem) { .doc dl { grid-template-columns: 13rem 1fr; } }
.doc dt { font-family: var(--mono); font-size: var(--step--1); color: var(--ink); }
.doc dd { margin: 0; color: var(--graphite); }
.updated { font-family: var(--mono); font-size: var(--step--1); color: var(--graphite); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important;
                           transition-duration: 0.001ms !important; }
}