/* ===========================================================================
   Shadow Sentinel — design system
   ---------------------------------------------------------------------------
   Light, editorial, restrained. The brand's dark navy and cyan are used as
   *accents on light*, not as a dark theme: bright cyan (#3FE2F7) fails
   contrast on white, so it only ever appears on dark surfaces. Interactive
   text on light uses --teal, which passes AA.
   =========================================================================== */

:root{
  /* surfaces */
  --paper:#FFFFFF;
  --paper-alt:#F6F8F9;
  --ink-surface:#0A1722;      /* dark panels, nav logo, code blocks */
  --ink-surface-2:#122634;

  /* text */
  --ink:#0A1722;
  --body:#4B6070;
  --muted:#7C8FA0;
  --on-dark:#E6F2F7;
  --on-dark-muted:#93A9B8;

  /* brand */
  --cyan:#3FE2F7;             /* dark surfaces only */
  --teal:#0B6E7D;             /* interactive on light — AA on white */
  --teal-deep:#08505C;
  --teal-wash:#EAF6F8;

  /* semantic */
  --danger:#B4261C;
  --danger-wash:#FDEEEC;
  --safe:#0B7A52;
  --safe-wash:#EAF6F1;
  --amber:#8A5A00;

  /* lines & depth — hairlines, not shadows */
  --line:#E4EAEE;
  --line-strong:#D2DCE2;
  --lift:0 1px 2px rgba(10,23,34,.04), 0 8px 24px -12px rgba(10,23,34,.12);

  --radius:12px;
  --wrap:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  background:var(--paper);
  color:var(--body);
  font:16.5px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro Text","Inter",
       "Segoe UI",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

a{color:var(--teal);text-decoration:none}
a:hover{color:var(--teal-deep)}

h1,h2,h3,h4{color:var(--ink);font-weight:660;letter-spacing:-.021em;line-height:1.15}
h1{font-size:clamp(38px,5.2vw,60px);letter-spacing:-.03em;font-weight:700}
h2{font-size:clamp(28px,3.4vw,40px);letter-spacing:-.026em}
h3{font-size:20px;letter-spacing:-.015em}
strong{color:var(--ink);font-weight:620}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
.narrow{max-width:760px}

/* --- eyebrow ------------------------------------------------------------ */
/* Monospace, no pill. Reads as a technical product rather than a template. */
.eyebrow{
  display:block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--teal);font-weight:600;margin-bottom:16px;
}
.eyebrow.on-dark{color:var(--cyan)}

.lede{font-size:18.5px;line-height:1.6;color:var(--body);max-width:62ch}

/* --- buttons ------------------------------------------------------------ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  background:var(--ink);color:#FFFFFF;font-weight:600;font-size:15px;
  padding:13px 24px;border-radius:10px;border:1px solid var(--ink);
  cursor:pointer;transition:background .16s,border-color .16s,color .16s;
  font-family:inherit;line-height:1.2;white-space:nowrap;
}
.btn:hover{background:#16303F;border-color:#16303F;color:#FFFFFF}
.btn:disabled{opacity:.5;cursor:default}

.btn.outline{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn.outline:hover{background:var(--paper-alt);border-color:var(--ink);color:var(--ink)}

.btn.accent{background:var(--teal);border-color:var(--teal)}
.btn.accent:hover{background:var(--teal-deep);border-color:var(--teal-deep)}

.btn.on-dark{background:var(--cyan);color:#04121A;border-color:var(--cyan)}
.btn.on-dark:hover{background:#6CEBFB;border-color:#6CEBFB;color:#04121A}

/* Outline button sitting on a dark surface. The light-surface outline hover
   flips to a pale fill, which reads as a glitch against dark navy. */
.btn.outline-dark{background:transparent;color:var(--on-dark);border-color:#2A4759}
.btn.outline-dark:hover{background:#16303F;border-color:#3D6076;color:var(--on-dark)}

.btn.lg{font-size:16px;padding:16px 32px}
.btn.block{width:100%}

/* --- nav ---------------------------------------------------------------- */
nav{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line);
}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:24px}
/* flex:none and nowrap together — without both, the wordmark breaks onto a
   second line the moment the links get crowded. */
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);flex:none;
  font-weight:650;letter-spacing:.13em;font-size:12px;white-space:nowrap;
  line-height:1}
.brand:hover{color:var(--ink)}
.brand svg{flex:none;display:block}
nav .links{display:flex;gap:26px;align-items:center;font-size:14.5px;flex:none}
nav .links a{white-space:nowrap}
nav .links a:not(.btn){color:var(--body);font-weight:500}
nav .links a:not(.btn):hover{color:var(--ink)}
nav .links a.active{color:var(--ink);font-weight:600}

/* --- sections ----------------------------------------------------------- */
section{padding:96px 0}
section.tint{background:var(--paper-alt);border-top:1px solid var(--line);
  border-bottom:1px solid var(--line)}
section.dark{background:var(--ink-surface);color:var(--on-dark-muted)}
section.dark h2,section.dark h3,section.dark h4{color:var(--on-dark)}
section.dark .lede{color:var(--on-dark-muted)}
section.dark strong{color:var(--on-dark)}

/* Centred by default across the site. `.sec-head.left` opts out where a
   header sits beside its own artwork. */
.sec-head{margin:0 auto 52px;max-width:64ch;text-align:center}
.sec-head .lede{margin-left:auto;margin-right:auto}
.sec-head.left{margin-left:0;text-align:left}
.sec-head.left .lede{margin-left:0}
.sec-head h2{margin-bottom:16px}

/* --- feature grid ------------------------------------------------------- */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:2px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden}
.feature{background:var(--paper);padding:30px 28px}
.feature svg{color:var(--teal);margin-bottom:16px;display:block}
.feature h4{font-size:17px;margin-bottom:8px}
.feature p{font-size:15px;line-height:1.62;color:var(--body)}

/* --- generic card ------------------------------------------------------- */
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px}
.card.dark{background:var(--ink-surface);border-color:#1E3444;color:var(--on-dark-muted)}
.card.dark h3,.card.dark h4{color:var(--on-dark)}

/* --- code / terminal ---------------------------------------------------- */
.code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;
  line-height:1.7;background:var(--ink-surface);color:var(--on-dark-muted);
  border-radius:10px;padding:16px 18px;overflow-x:auto}
.code .dim{color:#5E7686}

/* --- verdict callout ---------------------------------------------------- */
.verdict{border-radius:10px;padding:16px 18px;margin-top:14px;
  border:1px solid var(--line);background:var(--paper-alt)}
.verdict.bad{background:var(--danger-wash);border-color:#F3D2CE}
.verdict.good{background:var(--safe-wash);border-color:#CCE6DC}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;
  letter-spacing:.09em;text-transform:uppercase;padding:4px 9px;border-radius:5px;
  margin-bottom:10px}
.tag.bad{color:var(--danger);background:#F8DDD9}
.tag.good{color:var(--safe);background:#D9EFE5}
.verdict p{font-size:14.5px;line-height:1.6;color:var(--ink)}

/* --- app window mock ---------------------------------------------------- */
.window{border-radius:14px;overflow:hidden;background:var(--ink-surface);
  border:1px solid #1E3444;box-shadow:0 30px 70px -30px rgba(10,23,34,.42);}
.window .titlebar{display:flex;align-items:center;gap:7px;padding:12px 15px;
  background:#0D1E2B;border-bottom:1px solid #1B2F3D}
.window .dot{width:11px;height:11px;border-radius:50%;background:#31485A}
.window .body{display:grid;grid-template-columns:154px 1fr;min-height:290px}
.window .side{border-right:1px solid #1B2F3D;padding:14px 10px;font-size:12.5px}
.window .side div{padding:7px 11px;border-radius:7px;color:#7E96A6;margin-bottom:2px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.window .side div.on{background:rgba(63,226,247,.12);color:var(--cyan);font-weight:600}
.window .main{padding:20px 22px}
.window .row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  padding-bottom:14px;border-bottom:1px solid #1B2F3D;margin-bottom:16px}
.window .path{font-family:ui-monospace,Menlo,monospace;font-size:12px;color:#7E96A6;
  word-break:break-all;line-height:1.6}
.window .fname{color:var(--on-dark);font-weight:620;font-size:15px}
.window .chip{font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:4px 8px;border-radius:5px;background:rgba(180,38,28,.2);color:#FF9C93;
  white-space:nowrap}
.window .ai{margin-top:16px;border-radius:9px;padding:14px 15px;
  background:rgba(63,226,247,.08);border:1px solid rgba(63,226,247,.24)}
.window .ai .who{font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--cyan);font-weight:700;margin-bottom:8px}
.window .ai p{font-size:13.5px;line-height:1.62;color:#C6DCE7}

/* --- trust list --------------------------------------------------------- */
.trust{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:34px}
.trust h4{font-size:16px;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.trust svg{color:var(--teal);flex:none}
.trust p{font-size:14.5px;line-height:1.62}
section.dark .trust svg{color:var(--cyan)}

/* --- footer ------------------------------------------------------------- */
footer{padding:56px 0;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
  align-items:center}
footer a{color:var(--muted)}
footer a:hover{color:var(--ink)}
footer .links{display:flex;gap:26px;flex-wrap:wrap}

/* --- utilities ---------------------------------------------------------- */
.meta{font-size:13.5px;color:var(--muted)}
.meta b{color:var(--safe);font-weight:620}
section.dark .meta{color:var(--on-dark-muted)}
section.dark .meta b{color:#5FE3A8}
.center{text-align:center}
[hidden]{display:none!important}

@media(max-width:900px){
  section{padding:68px 0}
  .sec-head{margin-bottom:36px}
  .window .body{grid-template-columns:1fr}
  .window .side{display:none}
}
/* Shed nav links before anything is allowed to wrap. */
@media(max-width:1000px){
  nav .links{gap:22px}
  nav .links a[href$="#difference"]{display:none}
}
@media(max-width:820px){
  nav .links a:not(.btn){display:none}
}
@media(max-width:700px){
  h1{font-size:clamp(31px,8vw,40px)}
  .wrap{padding:0 20px}
}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important}
  html{scroll-behavior:auto}
}