/* ============================================================
   The AI-Native
   css/styles.css
   ------------------------------------------------------------
   1. Tokens          6. Courses (feature + cards)
   2. Reset + base    7. The path
   3. Utilities       8. Footer
   4. Topbar / nav    9. Responsive
   5. Hero           10. Motion + print
   ============================================================ */

/* ── 1. Tokens ───────────────────────────────────────────── */
:root{
  --ink:        #05090f;   /* page background            */
  --ink-2:      #08101d;   /* alternating band           */
  --panel:      #0c1626;   /* card surface               */
  --panel-2:    #101d31;   /* raised surface             */
  --line:       #1b2c47;   /* hairline border            */

  --blue:       #3fa9ff;   /* signal blue (from the mark) */
  --blue-deep:  #1668b0;
  --brass:      #f2b735;   /* gold (from the mark)        */

  --white:      #eaf2ff;
  --text:       #b9c8de;
  --dim:        #7183a0;

  --display: "Chakra Petch", "Segoe UI", sans-serif;
  --body:    "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, Consolas, monospace;

  --wrap: 1180px;
  --r: 4px;

  --shadow: 0 24px 60px -28px rgba(0,0,0,.9);
}

/* ── 2. Reset + base ─────────────────────────────────────── */
*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:96px; -webkit-text-size-adjust:100%; }

body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--body);
  font-size:17px;
  line-height:1.65;
  overflow-x:hidden;
  background-image:
    radial-gradient(900px 500px at 12% -8%, rgba(63,169,255,.10), transparent 70%),
    radial-gradient(760px 460px at 92% 4%, rgba(242,183,53,.07), transparent 70%);
  background-repeat:no-repeat;
}

img{ max-width:100%; height:auto; display:block; }
a{ color:inherit; }

h1,h2,h3{
  font-family:var(--display);
  font-weight:700;
  color:var(--white);
  line-height:1.05;
  letter-spacing:-.01em;
  margin:0;
}

p{ margin:0; }
ul,ol,dl{ margin:0; padding:0; list-style:none; }

::selection{ background:var(--blue); color:#04080e; }

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

/* ── 3. Utilities ────────────────────────────────────────── */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(20px, 5vw, 48px);
}

.sr{
  position:absolute; width:1px; height:1px;
  padding:0; margin:-1px; overflow:hidden;
  clip:rect(0 0 0 0); white-space:nowrap; border:0;
}

.skip{
  position:absolute; left:-9999px; top:12px; z-index:200;
  background:var(--brass); color:#0a0d12;
  padding:10px 18px; font-family:var(--mono); font-size:13px;
  text-decoration:none; border-radius:var(--r);
}
.skip:focus{ left:16px; }

.eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--blue);
  margin-bottom:22px;
}

/* scan bar (scroll progress) */
.scan{
  position:fixed; inset:0 0 auto 0; height:2px; z-index:120;
  background:rgba(27,44,71,.6);
  pointer-events:none;
}
.scan span{
  display:block; height:100%; width:0;
  background:linear-gradient(90deg, var(--blue-deep), var(--blue) 60%, var(--brass));
  box-shadow:0 0 12px rgba(63,169,255,.7);
}

/* reticle corners — the detector motif, carried over */
.c{
  position:absolute; width:22px; height:22px;
  border:2px solid rgba(63,169,255,.5);
  opacity:0; transition:opacity .5s ease, transform .5s ease;
  pointer-events:none;
}
.c--tl{ top:-14px; left:clamp(8px,3vw,36px); border-right:0; border-bottom:0; transform:translate(-8px,-8px); }
.c--tr{ top:-14px; right:clamp(8px,3vw,36px); border-left:0;  border-bottom:0; transform:translate(8px,-8px); }
.c--bl{ bottom:-14px; left:clamp(8px,3vw,36px); border-right:0; border-top:0; transform:translate(-8px,8px); }
.c--br{ bottom:-14px; right:clamp(8px,3vw,36px); border-left:0; border-top:0; transform:translate(8px,8px); }
.is-seen .c{ opacity:1; transform:translate(0,0); }

/* buttons */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--mono); font-size:13px; letter-spacing:.12em;
  text-transform:uppercase; text-decoration:none;
  color:var(--white);
  padding:15px 26px;
  border:1px solid var(--line);
  background:rgba(12,22,38,.7);
  border-radius:var(--r);
  transition:border-color .2s, background .2s, transform .2s, color .2s;
}
.btn:hover{ border-color:var(--blue); background:rgba(63,169,255,.10); transform:translateY(-2px); }

.btn--primary{
  color:#04080e;
  background:linear-gradient(180deg, #57b6ff, var(--blue));
  border-color:transparent;
  font-weight:500;
  box-shadow:0 10px 30px -12px rgba(63,169,255,.75);
}
.btn--primary:hover{ background:linear-gradient(180deg, #7ac6ff, #49b0ff); color:#04080e; }

/* the small mono subject tag on every course */
.tag{
  display:block;
  font-family:var(--mono); font-size:11px;
  letter-spacing:.22em; text-transform:uppercase;
  color:var(--blue);
  margin-bottom:10px;
}
.tag--brass{ color:var(--brass); }

/* ── 4. Topbar / nav ─────────────────────────────────────── */
.topbar{
  position:sticky; top:0; z-index:100;
  border-bottom:1px solid transparent;
  transition:background .3s, border-color .3s, backdrop-filter .3s;
}
.topbar.is-stuck{
  background:rgba(5,9,15,.86);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.topbar__inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:24px; min-height:72px;
}

.mark{ display:flex; align-items:center; gap:12px; text-decoration:none; }
.mark__glyph{
  font-family:var(--display); font-weight:700; font-size:17px;
  color:var(--blue);
  border:1px solid var(--line);
  background:rgba(63,169,255,.08);
  padding:5px 9px; border-radius:var(--r);
  line-height:1;
}
.mark__text{ display:flex; flex-direction:column; line-height:1.1; }
.mark__small{
  font-family:var(--mono); font-size:10px; letter-spacing:.24em;
  text-transform:uppercase; color:var(--dim);
}
.mark__big{
  font-family:var(--display); font-weight:700; font-size:17px;
  letter-spacing:.01em; color:var(--white);
}

.nav{ display:flex; align-items:center; gap:2px; }
.nav a{
  display:flex; align-items:center; gap:6px;
  font-size:13.5px; text-decoration:none; color:var(--dim);
  padding:9px 11px; border-radius:var(--r);
  border:1px solid transparent;
  transition:color .2s, border-color .2s, background .2s;
  white-space:nowrap;
}
/* every nav item leaves this site — say so */
.nav a::after{
  content:"\2197";
  font-family:var(--mono); font-size:11px;
  color:var(--blue-deep);
  transition:color .2s, transform .2s;
}
.nav a:hover{ color:var(--white); background:rgba(63,169,255,.07); }
.nav a:hover::after{ color:var(--brass); transform:translate(1px,-1px); }

.menu-btn{
  display:none;
  width:42px; height:38px;
  background:transparent; border:1px solid var(--line); border-radius:var(--r);
  cursor:pointer; padding:0;
  flex-direction:column; justify-content:center; align-items:center; gap:5px;
}
.menu-btn span[aria-hidden]{ display:block; width:17px; height:1.5px; background:var(--white); transition:transform .25s, opacity .2s; }
.menu-btn[aria-expanded="true"] span:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.menu-btn[aria-expanded="true"] span:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }

/* ── 5. Hero ─────────────────────────────────────────────── */
.hero{ position:relative; padding:clamp(48px, 8vw, 96px) 0 clamp(56px, 8vw, 96px); overflow:hidden; }
.hero__grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(63,169,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63,169,255,.055) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(70% 60% at 30% 30%, #000 20%, transparent 78%);
  -webkit-mask-image:radial-gradient(70% 60% at 30% 30%, #000 20%, transparent 78%);
  pointer-events:none;
}
.hero__inner{ position:relative; }

.hero__art{ max-width:clamp(280px, 46vw, 540px); margin-bottom:clamp(26px, 4vw, 40px); }
.hero__art img{ width:100%; filter:drop-shadow(0 26px 50px rgba(0,0,0,.7)); }

.hero__title{
  font-size:clamp(42px, 8vw, 86px);
  letter-spacing:-.025em;
  margin-bottom:22px;
  text-wrap:balance;
}
.hero__title em{
  font-style:normal;
  background:linear-gradient(100deg, #d5ecff 0%, #7cc6ff 26%, var(--blue) 55%, #2f96e6 100%);
  -webkit-background-clip:text; background-clip:text;
  color:transparent;
}

/* gold chevron rule — the lockup device from the mark */
.chev{
  display:flex; align-items:center; gap:14px;
  max-width:560px; margin:0 0 30px;
  color:var(--brass); font-family:var(--mono); font-size:12px; letter-spacing:.3em;
}
.chev::before,.chev::after{
  content:""; flex:1; height:2px;
  background:linear-gradient(90deg, transparent, var(--brass));
}
.chev::after{ background:linear-gradient(270deg, transparent, var(--brass)); }

.hero__lead{
  max-width:58ch; font-size:clamp(17px, 2vw, 19.5px);
  color:var(--text); margin-bottom:38px;
}

.hero__actions{ display:flex; flex-wrap:wrap; gap:14px; margin-bottom:56px; }

.specs{
  display:grid; gap:1px;
  grid-template-columns:repeat(auto-fit, minmax(210px, 1fr));
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--r);
  overflow:hidden;
  max-width:860px;
}
.specs > div{ background:var(--ink); padding:20px 22px; }
.specs dt{
  font-family:var(--mono); font-size:11px; letter-spacing:.2em;
  text-transform:uppercase; color:var(--dim); margin-bottom:7px;
}
.specs dd{ margin:0; color:var(--white); font-size:15.5px; }

/* ── 6. Courses ──────────────────────────────────────────── */
.courses{
  padding:clamp(56px, 8vw, 96px) 0;
  border-block:1px solid var(--line);
  background:var(--ink-2);
}
.courses__label{
  font-family:var(--mono); font-size:11px; letter-spacing:.24em;
  text-transform:uppercase; color:var(--dim); margin-bottom:26px;
}

/* — the featured course — */
.feature{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  gap:clamp(24px, 4vw, 52px);
  align-items:center;
  text-decoration:none;
  padding:clamp(24px, 3.4vw, 40px);
  margin-bottom:clamp(14px, 2vw, 20px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(180deg, rgba(16,29,49,.7), rgba(8,16,29,.45));
  transition:border-color .25s, transform .25s, box-shadow .25s;
}
.feature:hover{
  border-color:rgba(63,169,255,.55);
  transform:translateY(-4px);
  box-shadow:var(--shadow);
}
.feature__art img{
  width:100%;
  filter:saturate(1.05) drop-shadow(0 20px 44px rgba(0,0,0,.65));
  transition:filter .25s;
}
.feature:hover .feature__art img{ filter:saturate(1.2) drop-shadow(0 22px 48px rgba(63,169,255,.3)); }

.feature__name{
  font-size:clamp(28px, 4vw, 44px);
  letter-spacing:-.02em;
  margin-bottom:16px;
}
.feature__tell{
  font-family:var(--mono);
  font-size:14px; line-height:1.6;
  color:var(--white);
  border-left:2px solid var(--brass);
  padding:8px 0 8px 16px;
  margin-bottom:18px;
}
.feature__tell span{
  display:block; font-size:11px; letter-spacing:.22em;
  text-transform:uppercase; color:var(--brass); margin-bottom:3px;
}
.feature__desc{ color:var(--text); max-width:56ch; margin-bottom:24px; }

/* — the other four — */
.cards{
  display:grid;
  grid-template-columns:repeat(2, minmax(0,1fr));
  gap:clamp(14px, 2vw, 20px);
}
.card{
  display:flex; flex-direction:column;
  height:100%; text-decoration:none;
  padding:clamp(18px, 2.2vw, 26px);
  border:1px solid var(--line);
  border-radius:var(--r);
  background:linear-gradient(180deg, rgba(16,29,49,.65), rgba(8,16,29,.4));
  transition:border-color .25s, transform .25s, box-shadow .25s;
}
.card:hover{
  border-color:rgba(63,169,255,.55);
  transform:translateY(-4px);
  box-shadow:var(--shadow);
}
.card__art{ display:block; margin-bottom:18px; }
.card__art img{
  width:100%;
  filter:saturate(1.05) drop-shadow(0 14px 32px rgba(0,0,0,.6));
  transition:filter .25s;
}
.card:hover .card__art img{ filter:saturate(1.2) drop-shadow(0 16px 36px rgba(63,169,255,.3)); }

.card__name{
  display:block;
  font-family:var(--display); font-weight:700;
  font-size:clamp(20px, 2.4vw, 25px);
  line-height:1.15; color:var(--white);
  letter-spacing:-.01em;
  margin-bottom:12px;
}
.card__tell{
  display:block;
  font-family:var(--mono); font-size:13px; line-height:1.55;
  color:var(--white);
  border-left:2px solid var(--brass);
  padding:4px 0 4px 14px;
  margin-bottom:14px;
}
.card__desc{ display:block; color:var(--text); font-size:15.5px; margin-bottom:22px; }

/* the call to action, shared by both card shapes */
.card__cta{
  display:flex; align-items:center; gap:8px;
  margin-top:auto;
  font-family:var(--mono); font-size:13px;
  letter-spacing:.02em;
  color:var(--blue);
  overflow-wrap:anywhere;
}
.card__cta b{ font-weight:400; transition:transform .2s; }
.feature:hover .card__cta,
.card:hover .card__cta{ color:var(--white); }
.feature:hover .card__cta b,
.card:hover .card__cta b{ transform:translate(2px,-2px); color:var(--brass); }

/* ── 7. The path ─────────────────────────────────────────── */
.path{
  padding:clamp(64px, 9vw, 112px) 0;
  background:
    radial-gradient(600px 300px at 50% 0%, rgba(63,169,255,.10), transparent 70%),
    var(--ink);
}
.path__inner{ position:relative; max-width:900px; }
.path__title{ font-size:clamp(28px, 4.4vw, 44px); margin-bottom:18px; }
.path__lead{ color:var(--text); max-width:62ch; margin-bottom:34px; }

.steps{ display:grid; gap:12px; margin-bottom:28px; }
.steps li{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  column-gap:18px; row-gap:4px;
  padding:18px 22px;
  border:1px solid var(--line); border-radius:var(--r);
  background:var(--panel);
  transition:border-color .25s, background .25s;
}
.steps li:hover{ border-color:rgba(63,169,255,.45); background:var(--panel-2); }
.steps b{
  grid-row:1 / span 2;
  font-family:var(--mono); font-size:12px; font-weight:500;
  color:var(--brass); letter-spacing:.14em;
  padding-top:4px;
}
.steps a{
  grid-column:2;
  font-family:var(--display); font-weight:600;
  font-size:clamp(17px, 2.2vw, 21px);
  color:var(--white); text-decoration:none;
  transition:color .2s;
}
.steps a:hover{ color:var(--blue); }
.steps span{ grid-column:2; color:var(--dim); font-size:15px; }

.path__note{
  font-family:var(--mono); font-size:12.5px; line-height:1.7;
  color:var(--dim); max-width:60ch;
}

/* ── 8. Footer ───────────────────────────────────────────── */
.foot{
  border-top:1px solid var(--line);
  background:var(--ink-2);
  padding:44px 0 40px;
}
.foot__inner{
  display:flex; flex-wrap:wrap; align-items:center;
  justify-content:space-between; gap:24px 32px;
}
.foot__brand{ display:flex; align-items:center; gap:12px; }
.foot__name{ font-family:var(--display); font-weight:700; color:var(--white); font-size:16px; line-height:1.2; }
.foot__domain{ font-family:var(--mono); font-size:12px; color:var(--dim); }

.foot__nav{ display:flex; flex-wrap:wrap; gap:6px 20px; }
.foot__nav a{ font-size:13.5px; color:var(--dim); text-decoration:none; transition:color .2s; }
.foot__nav a:hover{ color:var(--blue); }

.foot__legal{
  width:100%;
  border-top:1px solid var(--line);
  padding-top:22px;
  font-family:var(--mono); font-size:12px; color:var(--dim);
}

/* ── 9. Responsive ───────────────────────────────────────── */
@media (max-width: 1080px){
  .nav a{ font-size:12.5px; padding:9px 8px; }
}

@media (max-width: 900px){
  .menu-btn{ display:flex; }
  .nav{
    position:absolute; top:100%; left:0; right:0;
    flex-direction:column; align-items:stretch; gap:2px;
    padding:12px clamp(20px,5vw,48px) 20px;
    background:rgba(5,9,15,.97);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);
    display:none;
  }
  .nav.is-open{ display:flex; }
  .nav a{ padding:13px 12px; font-size:15px; justify-content:space-between; }

  .feature{ grid-template-columns:1fr; }
  .feature__art{ max-width:420px; }
}

@media (max-width: 720px){
  body{ font-size:16px; }
  .cards{ grid-template-columns:1fr; }
  .hero__actions .btn{ flex:1 1 auto; justify-content:center; }
  .foot__inner{ flex-direction:column; align-items:flex-start; }
  .steps li{ padding:16px 18px; column-gap:14px; }
}

@media (max-width: 460px){
  .mark__big{ font-size:15px; }
  .card__cta{ font-size:11.5px; letter-spacing:0; }
}

/* ── 10. Motion + print ──────────────────────────────────── */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    transition-duration:.001ms !important;
  }
  .c{ opacity:1; transform:none; }
}

@media print{
  .topbar,.scan,.hero__grid{ display:none !important; }
  body{ background:#fff; color:#000; }
  h1,h2,h3,.card__name,.feature__tell,.card__tell{ color:#000; }
  .feature,.card,.steps li{ break-inside:avoid; }
}