/* ==========================================================================
   Starhas Learning — skills-based hiring. Dark technical dev-tool aesthetic.
   Self-contained, offline. System + monospace font stacks only.
   Accent: electric teal / cyan.
   ========================================================================== */

:root {
  --bg:        #05070a;
  --bg-2:      #0a0e14;
  --panel:     #0d131c;
  --panel-2:   #111a25;
  --line:      #1c2734;
  --line-2:    #263548;
  --ink:       #e7edf3;
  --ink-soft:  #aab7c4;
  --ink-dim:   #6b7a8a;
  --teal:      #24e0c5;
  --teal-2:    #16b8a6;
  --teal-dim:  #0e7f74;
  --cyan:      #38bdf8;
  --warn:      #f5b458;
  --ok:        #37d67a;
  --err:       #ff5f6d;
  --radius:    14px;
  --radius-sm: 9px;
  --maxw:      1120px;
  --mono: ui-monospace, "SF Mono", "SFMono-Regular", "Cascadia Code",
          "JetBrains Mono", "Fira Code", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
          Arial, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Global tech grid backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(to right, rgba(36,224,197,0.035) 1px, transparent 1px) 0 0 / 46px 46px,
    linear-gradient(to bottom, rgba(36,224,197,0.035) 1px, transparent 1px) 0 0 / 46px 46px;
  mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(circle at 50% 0%, #000 0%, transparent 78%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -3;
  background:
    radial-gradient(720px 460px at 78% -6%, rgba(36,224,197,0.12), transparent 60%),
    radial-gradient(560px 400px at 6% 4%, rgba(56,189,248,0.08), transparent 55%);
}

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

img, svg { max-width: 100%; }

h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .5em; font-weight: 650; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.mono { font-family: var(--mono); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--teal);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--teal);
  display: inline-block;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--teal), var(--teal-2));
  color: #012019;
  box-shadow: 0 0 0 1px rgba(36,224,197,.35), 0 8px 26px -12px rgba(36,224,197,.6);
}
.btn-primary:hover { color: #012019; filter: brightness(1.06); }
.btn-ghost {
  background: rgba(255,255,255,.02);
  border-color: var(--line-2);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--ink); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(5,7,10,.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  height: 66px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }
.brand .logo { width: 30px; height: 30px; flex: none; }
.brand b { color: var(--teal); }
.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--ink-soft);
  padding: 8px 12px;
  border-radius: 8px;
}
.nav-links a:hover { color: var(--ink); background: rgba(255,255,255,.03); }
.nav-links a.active { color: var(--teal); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 92px 0 40px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { font-size: clamp(34px, 5vw, 56px); }
.hero h1 .hl { color: var(--teal); }
.hero p.lead {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 40ch;
  margin: 0 0 28px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-meta {
  margin-top: 34px;
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-dim);
}
.hero-meta b { color: var(--teal); font-weight: 600; }

/* ---------- Code editor mock ---------- */
.editor {
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0,0,0,.9), 0 0 0 1px rgba(36,224,197,.06);
}
.editor-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.015);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f57; }
.dot.y { background: #febc2e; }
.dot.g { background: #28c840; }
.editor-file {
  margin-left: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-dim);
}
.editor-tag {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--teal);
  border: 1px solid var(--teal-dim);
  padding: 2px 8px;
  border-radius: 20px;
}
.code {
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.85;
  padding: 16px 18px 18px;
  overflow-x: auto;
  white-space: pre;
  color: var(--ink-soft);
  margin: 0;
  counter-reset: ln;
}
.code .ln { display: block; }
.code .ln::before {
  counter-increment: ln;
  content: counter(ln);
  display: inline-block;
  width: 2ch;
  margin-right: 18px;
  color: #3a4a5c;
  text-align: right;
}
.k  { color: var(--cyan); }         /* keyword */
.fn { color: var(--teal); }         /* function */
.s  { color: #b8e6c0; }             /* string */
.c  { color: #4a5a6a; font-style: italic; } /* comment */
.n  { color: var(--warn); }         /* number */

.tests {
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,.28);
  padding: 14px 18px 16px;
  font-family: var(--mono);
  font-size: 12.4px;
}
.tests .thead {
  display: flex;
  justify-content: space-between;
  color: var(--ink-dim);
  margin-bottom: 9px;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.test-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 3px 0;
  color: var(--ink-soft);
}
.test-row .pass { color: var(--ok); }
.test-row .t { color: var(--ink-dim); margin-left: auto; }
.check {
  width: 15px; height: 15px; flex: none;
  border-radius: 4px;
  background: rgba(55,214,122,.14);
  border: 1px solid rgba(55,214,122,.4);
  color: var(--ok);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
}
.tests .summary {
  margin-top: 11px;
  padding-top: 11px;
  border-top: 1px dashed var(--line-2);
  display: flex;
  justify-content: space-between;
  color: var(--ok);
}
.score-pill {
  color: #012019;
  background: var(--teal);
  border-radius: 20px;
  padding: 1px 10px;
  font-weight: 700;
}

/* ---------- Sections ---------- */
section { padding: 62px 0; }
.section-head { max-width: 60ch; margin-bottom: 42px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 38px); }
.section-head p { color: var(--ink-soft); font-size: 16.5px; margin: 0; }
.center { text-align: center; margin-left: auto; margin-right: auto; }
.center .eyebrow { justify-content: center; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 20px; }
.g-2 { grid-template-columns: repeat(2, 1fr); }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), rgba(9,13,19,.6));
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color .18s ease, transform .18s ease;
}
.card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.card h3 { font-size: 18px; }
.card p { color: var(--ink-soft); margin: 0; font-size: 14.6px; }
.card .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal);
  display: block;
  margin-bottom: 12px;
}
.icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--line-2);
  background: rgba(36,224,197,.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--teal);
}
.icon svg { width: 20px; height: 20px; }

/* Feature list rows */
.feat {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.feat:last-child { border-bottom: none; }
.feat .icon { margin-bottom: 0; }
.feat h3 { font-size: 16.5px; margin-bottom: 4px; }
.feat p { color: var(--ink-soft); margin: 0; font-size: 14.4px; }

/* Steps flow */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 20px;
  background: var(--panel);
}
.step .num {
  font-family: var(--mono);
  font-size: 12px;
  color: #012019;
  background: var(--teal);
  width: 24px; height: 24px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 14px;
}
.step h3 { font-size: 15.5px; }
.step p { font-size: 13.8px; color: var(--ink-soft); margin: 0; }

/* Rubric card */
.rubric {
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
  font-family: var(--mono);
}
.rubric .rrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}
.rubric .rrow:last-child { border-bottom: none; }
.rubric .rrow .lbl { color: var(--ink-soft); }
.rubric .bar {
  flex: 1;
  height: 6px;
  margin: 0 16px;
  background: var(--line);
  border-radius: 4px;
  overflow: hidden;
  max-width: 260px;
}
.rubric .bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--teal-2), var(--teal));
}
.rubric .val { color: var(--teal); width: 44px; text-align: right; }

/* Leaderboard */
.board { font-family: var(--mono); font-size: 13.5px; }
.board .brow {
  display: grid;
  grid-template-columns: 34px 1fr 90px 70px;
  gap: 10px;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 8px;
  background: var(--panel);
}
.board .brow.top { border-color: var(--teal-dim); background: rgba(36,224,197,.05); }
.board .rank { color: var(--teal); font-weight: 700; }
.board .who { color: var(--ink); }
.board .lang { color: var(--ink-dim); font-size: 12px; }
.board .sc { text-align: right; color: var(--ok); font-weight: 600; }

/* ---------- Split / CTA banner ---------- */
.banner {
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background:
    radial-gradient(600px 260px at 88% 0%, rgba(36,224,197,.14), transparent 60%),
    linear-gradient(180deg, var(--panel-2), var(--panel));
  padding: 48px;
  text-align: center;
}
.banner h2 { font-size: clamp(24px, 3.2vw, 34px); }
.banner p { color: var(--ink-soft); max-width: 52ch; margin: 0 auto 26px; }
.banner .hero-actions { justify-content: center; }

/* terminal cta */
.terminal {
  font-family: var(--mono);
  font-size: 13.5px;
  background: #04060a;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 18px 20px;
  text-align: left;
  max-width: 520px;
  margin: 0 auto 26px;
  color: var(--ink-soft);
}
.terminal .prompt { color: var(--teal); }
.terminal .out { color: var(--ink-dim); }

/* ---------- Tables ---------- */
.data-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.data-table th, .data-table td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.data-table th {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--ink-dim);
  width: 34%;
  font-weight: 600;
}
.data-table td { color: var(--ink); }

/* tag chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  border: 1px solid var(--line-2);
  background: rgba(255,255,255,.02);
  padding: 5px 11px;
  border-radius: 20px;
}

/* ---------- Prose ---------- */
.prose { max-width: 72ch; }
.prose p { color: var(--ink-soft); margin: 0 0 18px; }
.prose h2 { font-size: 26px; margin-top: 40px; }
.prose h3 { font-size: 19px; margin-top: 28px; color: var(--ink); }
.prose ul { color: var(--ink-soft); padding-left: 20px; }
.prose li { margin: 8px 0; }
.prose strong { color: var(--ink); }
.quote {
  border-left: 2px solid var(--teal);
  padding: 8px 0 8px 22px;
  font-family: var(--mono);
  color: var(--teal);
  font-size: 16px;
  margin: 26px 0;
}
.quote span { display: block; color: var(--ink-dim); font-size: 13px; margin-top: 8px; }

/* ---------- Job / vacancy ---------- */
.job-head {
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  padding: 34px;
  margin-bottom: 34px;
}
.job-head h1 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 14px; }
.job-facts {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px;
}
.job-facts .chip { background: rgba(36,224,197,.06); border-color: var(--teal-dim); color: var(--teal); }
.salary-band {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--ink);
  margin-top: 18px;
  padding: 12px 16px;
  border: 1px dashed var(--teal-dim);
  border-radius: 10px;
  background: rgba(36,224,197,.04);
  display: inline-block;
}
.salary-band b { color: var(--teal); }

.job-col { display: grid; grid-template-columns: 1fr 340px; gap: 40px; align-items: start; }
.job-aside {
  position: sticky;
  top: 84px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 22px;
}
.job-aside h3 { font-size: 15px; font-family: var(--mono); color: var(--teal); }
.job-aside dl { margin: 0; font-size: 13.6px; }
.job-aside dt { color: var(--ink-dim); font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing:.05em; margin-top: 14px; }
.job-aside dd { margin: 3px 0 0; color: var(--ink); }

/* ---------- Forms ---------- */
.form { display: grid; gap: 16px; }
.form-row { display: grid; gap: 6px; }
.form-row.two { grid-template-columns: 1fr 1fr; gap: 16px; }
.form label {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-soft);
  letter-spacing: .02em;
}
.form label .req { color: var(--teal); }
.form input, .form select, .form textarea {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: 9px;
  padding: 11px 13px;
  width: 100%;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form textarea { min-height: 120px; resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(36,224,197,.14);
}
.form input::placeholder, .form textarea::placeholder { color: var(--ink-dim); }
.consent {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  font-size: 13.4px;
  color: var(--ink-soft);
  font-family: var(--sans);
  line-height: 1.5;
}
.consent input { width: auto; margin-top: 3px; flex: none; }
.form-note {
  font-size: 12.6px;
  color: var(--ink-dim);
  font-family: var(--mono);
}
.form-panel {
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 28px;
}

/* callout */
.callout {
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--teal);
  background: rgba(36,224,197,.04);
  border-radius: 10px;
  padding: 16px 18px;
  font-size: 14px;
  color: var(--ink-soft);
  margin: 22px 0;
}
.callout b { color: var(--ink); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-2);
  padding: 54px 0 34px;
  margin-top: 40px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 32px;
}
.foot-grid h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 14px;
}
.foot-links { display: grid; gap: 9px; }
.foot-links a { color: var(--ink-soft); font-size: 14px; }
.foot-links a:hover { color: var(--teal); }
.foot-about p { color: var(--ink-dim); font-size: 13.5px; max-width: 34ch; margin: 14px 0 0; }
.foot-contact { font-size: 13.6px; color: var(--ink-soft); display: grid; gap: 8px; }
.foot-contact a { color: var(--ink-soft); }
.foot-bottom {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-dim);
}

/* ---------- Utility ---------- */
.mt-0 { margin-top: 0; }
.badge-live {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 12px; color: var(--ink-soft);
  border: 1px solid var(--line-2); border-radius: 20px; padding: 5px 12px;
  background: rgba(255,255,255,.02);
}
.badge-live .pulse {
  width: 7px; height: 7px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 0 rgba(55,214,122,.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(55,214,122,.5); }
  70% { box-shadow: 0 0 0 7px rgba(55,214,122,0); }
  100% { box-shadow: 0 0 0 0 rgba(55,214,122,0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .g-3, .g-4, .flow { grid-template-columns: 1fr 1fr; }
  .job-col { grid-template-columns: 1fr; }
  .job-aside { position: static; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 66px; left: 0; right: 0;
    flex-direction: column;
    background: var(--bg-2);
    border-bottom: 1px solid var(--line);
    padding: 12px;
    gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px; }
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    background: transparent;
    border: 1px solid var(--line-2);
    color: var(--ink);
    border-radius: 8px;
    padding: 8px 10px;
    cursor: pointer;
    font-family: var(--mono);
  }
  .g-2, .g-3, .g-4, .flow { grid-template-columns: 1fr; }
  .form-row.two { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 20px; }
  section { padding: 46px 0; }
  .banner, .form-panel, .job-head { padding: 26px; }
}