/* ============================================================
   Gradient Delta — Design System
   Ink & Paper palette with a signature indigo→violet→cyan gradient
   Headings: Space Grotesk · Body: Inter
   ============================================================ */

:root {
  --ink: #0b0e1a;
  --ink-soft: #14172a;
  --ink-border: rgba(255, 255, 255, 0.10);

  --paper: #fbfaf7;
  --paper-dim: #f2efe9;
  --paper-border: #e7e2d9;

  --text: #1b1b22;
  --text-muted: #5b5b66;
  --text-on-ink: #f4f3ef;
  --text-on-ink-muted: #a9a9bd;

  --indigo: #4f46e5;
  --violet: #7c3aed;
  --cyan: #06b6d4;
  --amber: #d97a3c;

  --gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 48%, #06b6d4 100%);
  --gradient-soft: linear-gradient(135deg, rgba(79,70,229,0.12) 0%, rgba(124,58,237,0.12) 48%, rgba(6,182,212,0.12) 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 2px rgba(11,14,26,0.06);
  --shadow-md: 0 8px 24px rgba(11,14,26,0.08);
  --shadow-lg: 0 24px 60px rgba(11,14,26,0.14);

  --container: 1180px;
  --font-head: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  color: var(--text);
}
h1 { font-size: clamp(2.2rem, 4.2vw, 3.4rem); font-weight: 650; }
h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; color: var(--text-muted); }
a { color: inherit; text-decoration: none; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--indigo);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

section { padding: 96px 0; }
section.tight { padding: 64px 0; }
.section-head { max-width: 680px; margin-bottom: 56px; }
.section-head p:last-child { margin-bottom: 0; }
.center { text-align: center; margin-left: auto; margin-right: auto; }

.on-ink { background: var(--ink); color: var(--text-on-ink); }
.on-ink p, .hero p, .page-hero p, .cta-band p { color: var(--text-on-ink-muted); }
.on-ink h1, .on-ink h2, .on-ink h3, .on-ink h4,
.hero h1, .hero h2, .hero h3, .hero h4,
.page-hero h1, .page-hero h2, .page-hero h3, .page-hero h4,
.cta-band h1, .cta-band h2, .cta-band h3, .cta-band h4 { color: var(--text-on-ink); }
.on-dim { background: var(--paper-dim); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--paper-border);
}
.btn-ghost:hover { border-color: var(--indigo); color: var(--indigo); }

.on-ink .btn-ghost, .hero .btn-ghost, .page-hero .btn-ghost, .cta-band .btn-ghost { color: var(--text-on-ink); border-color: var(--ink-border); }
.on-ink .btn-ghost:hover, .hero .btn-ghost:hover, .page-hero .btn-ghost:hover, .cta-band .btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-sm { padding: 9px 18px; font-size: 0.85rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 250, 247, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--paper-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  max-width: var(--container);
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-head); font-weight: 650; font-size: 1.15rem; }
.brand svg { width: 30px; height: 30px; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 18px; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle svg { width: 26px; height: 26px; }

@media (max-width: 860px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: flex-start; gap: 0; background: var(--paper); border-bottom: 1px solid var(--paper-border); padding: 8px 28px 20px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--paper-border); }
  .nav-toggle { display: block; }
  .nav-actions .btn-primary.header-cta { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--text-on-ink);
  padding: 120px 0 100px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.hero-copy p { font-size: 1.15rem; max-width: 540px; }
.hero-actions { display: flex; gap: 16px; margin-top: 32px; flex-wrap: wrap; }
.hero-art { position: relative; }
.hero-bg-glow {
  position: absolute;
  inset: -20% -10%;
  background: radial-gradient(60% 60% at 70% 30%, rgba(124,58,237,0.35), transparent 70%),
              radial-gradient(50% 50% at 20% 80%, rgba(6,182,212,0.28), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero .container { position: relative; z-index: 1; }

.stat-row { display: flex; gap: 48px; margin-top: 64px; flex-wrap: wrap; }
.stat-row .stat b { display: block; font-family: var(--font-head); font-size: 2rem; }
.stat-row .stat span { font-size: 0.85rem; color: var(--text-on-ink-muted); }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
}

/* ---------- Cards ---------- */
.grid { display: grid; gap: 28px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: #fff;
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-lg);
  padding: 34px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }
.card .icon-badge { margin-bottom: 20px; }
.card h3 { margin-bottom: 10px; }
.card p:last-child { margin-bottom: 0; }
.card .card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 12px; font-weight: 600; color: var(--indigo); font-size: 0.92rem; }
.card .card-link svg { width: 14px; height: 14px; transition: transform 0.15s ease; }
.card:hover .card-link svg { transform: translateX(3px); }

.icon-badge {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-soft);
}
.icon-badge svg { width: 26px; height: 26px; color: var(--indigo); }

/* ---------- Feature list ---------- */
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li { display: flex; gap: 12px; padding: 10px 0; align-items: flex-start; }
.check-list li svg { flex-shrink: 0; width: 20px; height: 20px; margin-top: 2px; color: var(--cyan); }
.check-list b { color: var(--text); }
.on-ink .check-list b { color: var(--text-on-ink); }

/* ---------- Divider ---------- */
.gradient-rule { height: 3px; border: none; background: var(--gradient); border-radius: 3px; width: 64px; margin: 0 0 20px; }

/* ---------- Training catalog ---------- */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.filter-pill {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--paper-border);
  background: #fff;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s ease;
}
.filter-pill:hover { border-color: var(--indigo); color: var(--indigo); }
.filter-pill.active { background: var(--gradient); color: #fff; border-color: transparent; }

.course-list { display: flex; flex-direction: column; gap: 18px; }
.course-item {
  background: #fff;
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.course-item[open] { border-color: transparent; box-shadow: var(--shadow-md); }
.course-summary {
  list-style: none;
  cursor: pointer;
  padding: 26px 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.course-summary::-webkit-details-marker { display: none; }
.course-summary-main { display: flex; align-items: center; gap: 18px; flex: 1; min-width: 0; }
.course-summary-main h3 { margin: 0; }
.course-tag {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--violet);
  background: var(--gradient-soft);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 8px;
}
.course-meta-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.course-hours {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.course-hours svg { width: 16px; height: 16px; }
.chevron { width: 22px; height: 22px; flex-shrink: 0; transition: transform 0.2s ease; color: var(--text-muted); }
.course-item[open] .chevron { transform: rotate(180deg); }

.course-body { padding: 0 30px 40px; border-top: 1px solid var(--paper-border); }
.course-body-inner { padding-top: 30px; display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; }
@media (max-width: 780px) { .course-body-inner { grid-template-columns: 1fr; } }
.course-body h4 { font-family: var(--font-head); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--indigo); margin-bottom: 14px; }
.course-body .obj-list, .topic-list { list-style: none; padding: 0; margin: 0 0 28px; }
.obj-list li, .topic-list li { padding: 8px 0 8px 22px; position: relative; color: var(--text-muted); border-bottom: 1px dashed var(--paper-border); font-size: 0.94rem; }
.obj-list li:last-child, .topic-list li:last-child { border-bottom: none; }
.obj-list li::before, .topic-list li::before { content: "→"; position: absolute; left: 0; color: var(--cyan); font-weight: 700; }
.result-block { margin-bottom: 16px; }
.result-block b { display: block; color: var(--text); font-family: var(--font-head); font-size: 0.98rem; margin-bottom: 4px; }
.course-cta { margin-top: 10px; }

/* ---------- Testimonial / quote ---------- */
.quote-block {
  border-left: 3px solid transparent;
  border-image: var(--gradient) 1;
  padding-left: 26px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--text);
}

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--ink);
  color: var(--text-on-ink);
  border-radius: var(--radius-lg);
  padding: 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band h2 { color: #fff; }
.cta-band::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(60% 100% at 50% 0%, rgba(124,58,237,0.35), transparent 70%);
}
.cta-band > * { position: relative; z-index: 1; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- Forms ---------- */
form.stack { display: flex; flex-direction: column; gap: 20px; max-width: 560px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-family: var(--font-head); font-weight: 600; font-size: 0.88rem; }
.field input, .field textarea, .field select {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--paper-border);
  background: #fff;
  color: var(--text);
}
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--indigo); outline-offset: 1px; }
.field textarea { resize: vertical; min-height: 130px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: var(--text-on-ink-muted); padding: 72px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 56px; }
@media (max-width: 780px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand .brand { color: var(--text-on-ink); margin-bottom: 14px; }
.footer-brand p { max-width: 280px; }
.footer-col h4 { color: var(--text-on-ink); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 16px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 0.92rem; transition: color 0.15s ease; }
.footer-col a:hover { color: var(--text-on-ink); }
.footer-bottom { border-top: 1px solid var(--ink-border); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 0.82rem; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { background: var(--ink); color: var(--text-on-ink); padding: 88px 0 72px; position: relative; overflow: hidden; }
.page-hero .container { position: relative; z-index: 1; }
.page-hero p { max-width: 620px; font-size: 1.08rem; }
.breadcrumb { font-size: 0.85rem; color: var(--text-on-ink-muted); margin-bottom: 18px; }
.breadcrumb a:hover { color: var(--cyan); }

/* ---------- Two col layout ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }

.badge-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.pill-badge {
  font-family: var(--font-head);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--paper-dim);
  color: var(--text-muted);
  border: 1px solid var(--paper-border);
}

.value-card { padding: 30px; border-radius: var(--radius-md); background: var(--paper-dim); }