/* Sylence — NUL, for the web.
   Mirrors lib/theme.dart: pure OLED black, no colour, radius 0, state
   carried by opacity and hairlines. Space Grotesk for interface, IBM Plex
   Mono for data and labels; both are loaded from Google Fonts with real
   fallbacks so the page is legible if they never arrive. */
:root {
  --bg:   #000000;
  --hair: #2A2A26;
  --tick: #3A3A34;
  --muted:#55554F;
  --mid:  #8A8A82;
  --text: #E8E8E2;
}
* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--mid);
  font-family: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;
  font-weight: 300;
  max-width: 760px; margin: 0 auto; padding: 64px 24px 96px;
  line-height: 1.75; font-size: 17px;
}
h1, h2, h3 { color: var(--text); font-weight: 300; line-height: 1.2; }
h1 { font-size: 2.4rem; margin: 0 0 .6em; letter-spacing: -0.5px; }
h2 { font-size: 1.35rem; margin: 2.6em 0 .6em; }
h3 { font-size: 1.05rem; margin: 2em 0 .4em; }
p { margin: 0 0 1.1em; }
strong { color: var(--text); font-weight: 400; }
a { color: var(--text); text-decoration: underline;
    text-underline-offset: 3px; text-decoration-color: var(--tick); }
a:hover { text-decoration-color: var(--text); }
ul, ol { padding-left: 1.3em; } li { margin: .5em 0; }
hr { border: 0; border-top: 1px solid var(--hair); margin: 3.5em 0; }
code { font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
       font-size: .9em; color: var(--mid); }
.muted { color: var(--muted); font-size: .9em; }
.kicker { font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
          font-size: .68rem; letter-spacing: .22em; text-transform: uppercase;
          color: var(--muted); margin: 0 0 1.6em; }
.mark { display:block; width: 84px; height: 84px; margin: 0 0 32px; }
.cta { display: inline-block; margin: .6em 0 0; padding: 15px 26px;
       border: 1px solid var(--text); color: var(--text);
       text-decoration: none;
       font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
       font-size: .82rem; letter-spacing: .16em; text-transform: uppercase; }
.cta:hover { background: var(--text); color: var(--bg); }
.note { border-left: 1px solid var(--hair); padding-left: 20px;
        color: var(--muted); font-size: .93em; }
nav.foot { margin-top: 4em; padding-top: 2em; border-top: 1px solid var(--hair);
           font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace;
           font-size: .74rem; letter-spacing: .1em; color: var(--muted); }
nav.foot a { display: inline-block; margin: 0 18px .5em 0; color: var(--mid); }
figure.spectrum { margin: 2em 0; }
figure.spectrum figcaption { font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: .7rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted); margin-top: .8em; }
/* Arabic must never be letterspaced — joined letterforms. */
[dir="rtl"] { font-family: 'IBM Plex Sans Arabic', Tahoma, Arial, sans-serif;
              letter-spacing: 0; }
[dir="rtl"] ul, [dir="rtl"] ol { padding-left: 0; padding-right: 1.3em; }
[dir="rtl"] .note { border-left: 0; border-right: 1px solid var(--hair);
                    padding-left: 0; padding-right: 20px; }