/* OEG Training Library Pages — Design System Skin
   Loads on top of ../assets/tokens.css
   Matches the index.html aesthetic: Sora + Inter + JetBrains Mono,
   navy-900 darks, steel-50 lights, safety-orange accent.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--fg-1);
  background: var(--bg-canvas);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01","cv11";
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

:root {
  --lp-max: 1280px;
  --lp-gutter: 32px;
  --lp-hairline: 1px solid var(--border-subtle);
  --lp-hairline-inv: 1px solid rgba(255,255,255,0.10);
}

/* ============================================================
   Shell / layout
   ============================================================ */
.lp-shell {
  max-width: var(--lp-max);
  margin: 0 auto;
  padding: 0 var(--lp-gutter);
  position: relative;
}

/* ============================================================
   Navigation
   ============================================================ */
.lp-nav {
  position: sticky; top: 0; z-index: 50;
  height: 64px;
  background: color-mix(in srgb, var(--bg-canvas) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--lp-hairline);
}
.lp-nav-inner {
  max-width: var(--lp-max);
  margin: 0 auto;
  padding: 0 var(--lp-gutter);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.lp-nav-brand { display: flex; align-items: center; }
.lp-nav-brand img { height: 30px; width: auto; display: block; }

.lp-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
}
.lp-nav-link {
  padding: 8px 12px;
  font: 500 13px/1 var(--font-body);
  color: var(--fg-2);
  border-radius: 6px;
  transition: color 160ms, background 160ms;
  white-space: nowrap;
  cursor: pointer;
}
.lp-nav-link:hover { color: var(--fg-1); background: var(--bg-surface-alt); }
.lp-nav-link-active { color: var(--fg-1); font-weight: 600; }

/* Dropdown */
.lp-nav-dd { position: relative; }
.lp-nav-dd:hover .lp-nav-dd-menu { display: block; }
.lp-nav-dd-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 248px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.13);
  padding: 8px 0;
  z-index: 200;
}
.lp-nav-dd-label {
  font: 600 9px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  padding: 6px 16px 10px;
  border-bottom: var(--lp-hairline);
  margin-bottom: 4px;
}
.lp-nav-dd-item {
  display: block;
  padding: 8px 16px;
  font: 500 13px/1.2 var(--font-body);
  color: var(--fg-2);
  transition: color 140ms, background 140ms;
}
.lp-nav-dd-item:hover { color: var(--fg-1); background: var(--bg-surface-alt); }
.lp-nav-dd-item.is-active { color: var(--accent); font-weight: 600; }

/* ============================================================
   Buttons
   ============================================================ */
.lp-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  font: 600 13px/1 var(--font-body);
  border-radius: 4px;
  border: 1px solid transparent;
  transition: all 180ms;
  cursor: pointer;
  white-space: nowrap;
}
.lp-btn-primary { background: var(--brand); color: var(--white); }
.lp-btn-primary:hover {
  background: var(--brand-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(16,26,61,0.18);
}
.lp-btn-secondary {
  background: transparent;
  color: var(--fg-1);
  border-color: var(--border-default);
}
.lp-btn-secondary:hover { border-color: var(--brand); color: var(--brand); }
.lp-btn-inv { background: var(--white); color: var(--navy-900); }
.lp-btn-inv:hover { background: #f0f2f7; }

/* Secondary button on dark (hero) backgrounds */
.lp-hero .lp-btn-secondary {
  color: rgba(255,255,255,0.85);
  border-color: rgba(255,255,255,0.30);
}
.lp-hero .lp-btn-secondary:hover {
  color: var(--white);
  border-color: rgba(255,255,255,0.60);
  background: rgba(255,255,255,0.08);
}

/* ============================================================
   Section chrome
   ============================================================ */
.lp-section {
  padding: 88px 0;
  border-top: var(--lp-hairline);
}
.lp-section-dark {
  background: var(--navy-900);
  color: var(--white);
  border-top: none;
  position: relative;
  overflow: hidden;
}
.lp-section-dark::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(115deg, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(65deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.lp-section-head {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 56px;
}
.lp-section-index {
  font: 600 11px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.lp-section-dark .lp-section-index { color: rgba(255,255,255,0.45); }
.lp-section-head h2 {
  margin: 0;
  font: 600 clamp(1.75rem, 3vw, 2.75rem)/1.05 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--fg-1);
  text-wrap: balance;
}
.lp-section-dark .lp-section-head h2 { color: var(--white); }
.lp-accent { color: var(--accent); margin-right: 8px; }

/* ============================================================
   Hero band
   ============================================================ */
.lp-hero {
  background: var(--navy-900);
  position: relative;
  padding: 80px 0 72px;
  overflow: hidden;
}
.lp-hero-iso {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(115deg, rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(65deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 40% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 40% 50%, black 30%, transparent 100%);
}
.lp-hero-meta {
  font: 600 10px/1 var(--font-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}
.lp-hero-meta .lp-dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 1px;
  flex: none;
}
.lp-hero-meta .lp-sep { color: rgba(255,255,255,0.2); }
.lp-hero-title {
  font: 600 clamp(2.5rem, 5vw, 4.25rem)/1 var(--font-display);
  letter-spacing: -0.03em;
  color: var(--white);
  margin: 0 0 24px;
  text-wrap: balance;
  position: relative;
  max-width: 20ch;
}
.lp-hero-lead {
  font: 400 18px/1.6 var(--font-body);
  color: rgba(255,255,255,0.72);
  max-width: 58ch;
  margin: 0 0 36px;
  text-wrap: pretty;
  position: relative;
}
.lp-hero-actions { position: relative; display: flex; gap: 12px; }

/* ============================================================
   §01 Overview
   ============================================================ */
.lp-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.lp-overview-media video,
.lp-overview-media .lp-media-placeholder {
  width: 100%;
  border-radius: 8px;
  border: var(--lp-hairline);
  display: block;
  background: var(--navy-900);
}
.lp-overview-media video { max-height: 320px; object-fit: cover; }
.lp-media-placeholder {
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.lp-media-placeholder::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(115deg, rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(65deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 28px 28px;
}
.lp-media-placeholder span {
  position: relative;
  font: 500 10px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.lp-overview-body h3 {
  font: 600 28px/1.1 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--fg-1);
  margin: 0 0 16px;
}
.lp-overview-body p {
  font: 400 15px/1.6 var(--font-body);
  color: var(--fg-2);
  margin: 0 0 20px;
  text-wrap: pretty;
}
.lp-overview-body ul {
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  border-top: var(--lp-hairline);
}
.lp-overview-body ul li {
  font: 500 14px/1.5 var(--font-body);
  color: var(--fg-2);
  padding: 10px 0;
  border-bottom: var(--lp-hairline);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.lp-overview-body ul li::before {
  content: "—";
  color: var(--accent);
  font: 600 12px/1.5 var(--font-mono);
  flex: none;
}

/* ============================================================
   §02 Topics
   ============================================================ */
.lp-topics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}
.lp-topic {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  background: rgba(255,255,255,0.02);
  transition: background 140ms;
}
.lp-topic:hover { background: rgba(255,255,255,0.05); }
.lp-topic-num {
  font: 600 10px/1 var(--font-mono);
  letter-spacing: 0.12em;
  color: var(--accent);
  flex: none;
  width: 28px;
}
.lp-topic-label {
  font: 500 14px/1.3 var(--font-body);
  color: rgba(255,255,255,0.82);
}
.lp-topics-note {
  margin-top: 24px;
  font: 500 12px/1.5 var(--font-mono);
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.4);
  position: relative;
}

/* ============================================================
   §03 Delivery
   ============================================================ */
.lp-delivery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.lp-delivery-card {
  padding: 28px;
  border: var(--lp-hairline);
  border-radius: 8px;
  background: var(--bg-surface);
  transition: border-color 200ms, transform 200ms;
}
.lp-delivery-card:hover { border-color: var(--steel-400); transform: translateY(-2px); }
.lp-delivery-icon {
  width: 44px; height: 44px;
  border-radius: 6px;
  background: var(--navy-50);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  color: var(--navy-800);
}
.lp-delivery-card h4 {
  font: 600 16px/1.2 var(--font-display);
  letter-spacing: -0.01em;
  color: var(--fg-1);
  margin: 0 0 8px;
}
.lp-delivery-card p {
  font: 400 14px/1.5 var(--font-body);
  color: var(--fg-2);
  margin: 0;
}

/* ============================================================
   §04 Contact
   ============================================================ */
.lp-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 64px;
  align-items: start;
  position: relative;
}
.lp-contact-info h3 {
  font: 600 clamp(1.4rem, 2.5vw, 2rem)/1.15 var(--font-display);
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 12px;
  text-wrap: balance;
}
.lp-contact-info .lp-contact-sub {
  font: 400 14px/1.55 var(--font-body);
  color: rgba(255,255,255,0.65);
  margin: 0 0 32px;
}
.lp-contact-details {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.lp-contact-detail dt {
  font: 600 9px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 4px;
}
.lp-contact-detail dd {
  font: 500 13px/1.45 var(--font-body);
  color: rgba(255,255,255,0.82);
  margin: 0;
}

/* Form */
.lp-form {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  padding: 32px;
  position: relative;
}
.lp-form-title {
  font: 600 15px/1.2 var(--font-display);
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 0 0 8px;
}
.lp-form-sub {
  font: 400 12px/1.4 var(--font-body);
  color: rgba(255,255,255,0.45);
  margin: 0 0 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.10);
}
.lp-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.lp-form-row.lp-full { grid-template-columns: 1fr; }
.lp-form-input,
.lp-form-textarea {
  width: 100%;
  padding: 11px 14px;
  font: 500 13px/1.2 var(--font-body);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 4px;
  color: var(--white);
  outline: none;
  transition: border-color 150ms, background 150ms;
  font-family: var(--font-body);
}
.lp-form-input::placeholder,
.lp-form-textarea::placeholder { color: rgba(255,255,255,0.3); }
.lp-form-input:focus,
.lp-form-textarea:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.08);
}
.lp-form-textarea { resize: vertical; min-height: 110px; }
.lp-form-submit {
  width: 100%;
  margin-top: 8px;
  height: 46px;
  font: 600 14px/1 var(--font-body);
  letter-spacing: 0.01em;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 160ms, transform 160ms;
  font-family: var(--font-body);
}
.lp-form-submit:hover {
  background: var(--safety-600);
  transform: translateY(-1px);
}
.lp-form-submit:disabled { opacity: 0.6; cursor: default; transform: none; }
.lp-status {
  display: none;
  margin-top: 12px;
  padding: 11px 14px;
  border-radius: 4px;
  font: 500 13px/1.4 var(--font-body);
  text-align: center;
}
.lp-status-success {
  background: rgba(22,163,90,0.14);
  border: 1px solid rgba(22,163,90,0.28);
  color: #86efac;
}
.lp-status-error {
  background: rgba(212,47,47,0.14);
  border: 1px solid rgba(212,47,47,0.28);
  color: #fca5a5;
}

/* ============================================================
   Footer
   ============================================================ */
.lp-footer {
  background: var(--bg-canvas);
  border-top: var(--lp-hairline);
  padding: 52px 0 28px;
}
.lp-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.lp-footer-brand img {
  height: 26px;
  width: auto;
  margin-bottom: 12px;
}
.lp-footer-tagline {
  font: 500 12px/1.5 var(--font-body);
  color: var(--fg-3);
  max-width: 28ch;
  margin: 0 0 20px;
}
.lp-footer-col h5 {
  font: 600 10px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin: 0 0 14px;
}
.lp-footer-col a {
  display: block;
  font: 500 13px/1.3 var(--font-body);
  color: var(--fg-2);
  padding: 5px 0;
  transition: color 140ms;
}
.lp-footer-col a:hover { color: var(--fg-1); }
.lp-footer-bottom {
  border-top: var(--lp-hairline);
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font: 500 11px/1 var(--font-mono);
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.lp-footer-legal { display: flex; gap: 20px; }
.lp-footer-legal a:hover { color: var(--fg-1); }

/* ============================================================
   Hamburger button (show at ≤1024px, must be present in HTML)
   ============================================================ */
.lp-nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(255,255,255,0.9);
  margin-left: auto;
  flex: none;
  padding: 0;
}
.lp-nav-hamburger:hover { color: var(--white); }
.lp-nav-hamburger svg { pointer-events: none; }

/* ============================================================
   Responsive
   ============================================================ */

/* ── Tablet / large mobile ≤1024px ── */
@media (max-width: 1024px) {
  .lp-section { padding: 64px 0; }
  .lp-section-head { grid-template-columns: 1fr; gap: 12px; margin-bottom: 36px; }
  .lp-overview { grid-template-columns: 1fr; gap: 32px; }
  .lp-topics { grid-template-columns: repeat(2, 1fr); }
  .lp-delivery { grid-template-columns: repeat(2, 1fr); }
  .lp-contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .lp-footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }

  /* Nav — hide links, show hamburger */
  .lp-nav-links { display: none; }
  .lp-nav-hamburger { display: flex !important; }

  /* Mobile nav open state */
  .lp-nav-links.lp-nav-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0; bottom: 0;
    background: var(--navy-900);
    padding: 12px 24px 40px;
    overflow-y: auto;
    z-index: 49;
    gap: 0;
  }
  .lp-nav-links.lp-nav-open .lp-nav-link {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    font-size: 16px;
  }
  .lp-nav-links.lp-nav-open .lp-nav-dd {
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: 14px 0;
  }
  .lp-nav-links.lp-nav-open .lp-nav-dd-menu { display: none; }
}

/* ── Mobile ≤768px ── */
@media (max-width: 768px) {
  .lp-section { padding: 48px 0; }
  .lp-hero { padding: 52px 0 48px; }
  .lp-hero-title { font-size: clamp(1.7rem, 7vw, 2.5rem); }
  .lp-hero-lead { font-size: 1rem; }
  .lp-hero-actions { flex-direction: column; align-items: flex-start; gap: 10px; }
  .lp-hero-actions .lp-btn { width: 100%; max-width: 360px; justify-content: center; }
  .lp-delivery { grid-template-columns: 1fr; }
  .lp-contact-info h3 { font-size: 1.25rem; }
  .lp-form { padding: 24px 20px; }
  .lp-footer-brand { max-width: 100%; }
}

/* ── Small mobile ≤640px ── */
@media (max-width: 640px) {
  .lp-shell { padding: 0 16px; }
  .lp-section { padding: 40px 0; }
  .lp-hero { padding: 40px 0 36px; }
  .lp-hero-title { font-size: clamp(1.5rem, 8vw, 2rem); }
  .lp-hero-meta { flex-wrap: wrap; }
  .lp-topics { grid-template-columns: 1fr; }
  .lp-form-row { grid-template-columns: 1fr; }
  .lp-footer-grid { grid-template-columns: 1fr; }
  .lp-footer-bottom { flex-direction: column; align-items: flex-start; gap: 12px; }
  .lp-contact-details { gap: 16px; }
}

/* ── Very small ≤480px ── */
@media (max-width: 480px) {
  .lp-nav-brand img { max-height: 28px; }
  .lp-hero-actions .lp-btn { max-width: 100%; }
  .lp-section-index { font-size: 11px; }
  .lp-form-submit { width: 100%; }
  .lp-footer-legal { flex-wrap: wrap; gap: 12px; }
}

/* Dark mode: invert single-image logos so they're visible on dark backgrounds */
body[data-theme="dark"] .lp-nav-brand img,
body[data-theme="dark"] .lp-footer-brand img {
  filter: brightness(0) invert(1);
}