/* DeTLeng shared website design system
   Aligned with the DeTLeng Platform dashboard visual language. */

:root {
  --dt-blue: #0754a6;
  --dt-blue-dark: #073e79;
  --dt-blue-soft: #eaf3fc;
  --dt-gold: #f2b705;
  --dt-ink: #172033;
  --dt-muted: #627087;
  --dt-line: #dfe6ef;
  --dt-surface: #ffffff;
  --dt-background: #f5f7fa;
  --dt-shadow: 0 16px 45px rgba(14, 37, 66, 0.09);
  --dt-shadow-small: 0 6px 20px rgba(14, 37, 66, 0.06);
  --dt-radius: 18px;
  --dt-radius-small: 12px;
  --dt-nav-height: 76px;
  --dt-content-width: 1160px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--dt-background);
}

body {
  margin: 0;
  color: var(--dt-ink);
  background: var(--dt-background);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; }

a { color: var(--dt-blue); }

a:hover { color: var(--dt-blue-dark); }

::selection { color: #fff; background: var(--dt-blue); }

.detleng-nav {
  min-height: var(--dt-nav-height) !important;
  padding: 0 max(20px, calc((100% - var(--dt-content-width)) / 2)) !important;
  background: rgba(255, 255, 255, 0.96) !important;
  border-bottom: 1px solid rgba(223, 230, 239, 0.9) !important;
  box-shadow: none !important;
  backdrop-filter: blur(12px);
}

.detleng-logo img {
  width: auto !important;
  max-height: 48px !important;
  object-fit: contain;
}

.menu-links { gap: 8px !important; }

.menu-links a {
  padding: 10px 14px !important;
  color: #46546a !important;
  border-radius: 10px !important;
  font-size: 0.9rem !important;
  font-weight: 650 !important;
  line-height: 1.25;
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.menu-links a:hover {
  color: var(--dt-blue) !important;
  background: var(--dt-blue-soft) !important;
}

.menu-links a.active {
  color: #fff !important;
  background: var(--dt-blue) !important;
}

.detleng-content {
  width: min(var(--dt-content-width), calc(100% - 40px)) !important;
  max-width: var(--dt-content-width) !important;
  margin: 0 auto !important;
  padding: 72px 0 88px !important;
  color: var(--dt-ink);
  background: transparent !important;
}

.detleng-content > :first-child { margin-top: 0; }

.detleng-content h1,
.detleng-content h2,
.detleng-content h3,
.detleng-content h4 {
  color: var(--dt-ink) !important;
  font-family: "Segoe UI", Arial, sans-serif !important;
  text-wrap: balance;
}

.detleng-content h1 {
  max-width: 900px;
  margin-bottom: 22px !important;
  font-size: clamp(2.7rem, 5.4vw, 4.8rem) !important;
  line-height: 1.05 !important;
  letter-spacing: -0.055em !important;
}

.detleng-content h2 {
  margin-top: 64px !important;
  margin-bottom: 18px !important;
  font-size: clamp(1.75rem, 3vw, 2.55rem) !important;
  line-height: 1.16 !important;
  letter-spacing: -0.035em;
}

.detleng-content h3 {
  margin-bottom: 10px !important;
  font-size: 1.25rem !important;
  line-height: 1.3 !important;
}

.detleng-content p {
  max-width: 900px;
  color: var(--dt-muted) !important;
}

.detleng-content strong { color: var(--dt-ink); }

.detleng-content > div:first-of-type > p:first-of-type,
.detleng-header p,
.detleng-hero p,
.detleng-tagline {
  max-width: 760px !important;
  color: var(--dt-muted) !important;
  font-size: clamp(1.05rem, 1.7vw, 1.2rem) !important;
}

.detleng-content ul,
.detleng-content ol {
  max-width: 920px;
  padding-left: 1.3rem;
}

.detleng-content li {
  margin: 0.45rem 0;
  color: #536176;
}

.detleng-content li::marker { color: var(--dt-blue); }

.detleng-content hr {
  height: 1px !important;
  margin: 64px 0 !important;
  border: 0 !important;
  background: var(--dt-line) !important;
}

.detleng-content pre {
  margin: 0 !important;
  color: #34445a;
  font: 600 clamp(0.78rem, 1.4vw, 1rem)/1.9 "Segoe UI", Arial, sans-serif !important;
  white-space: pre-wrap;
}

/* Existing content panels and cards: visually normalized without changing markup. */
.detleng-content div[style*="border-radius"],
.detleng-card,
.detleng-highlight,
.detleng-principle {
  border-color: var(--dt-line) !important;
  border-radius: var(--dt-radius) !important;
  box-shadow: var(--dt-shadow-small) !important;
}

.detleng-content div[style*="background:#f5f7fa"],
.detleng-content div[style*="background:#f8fafc"],
.detleng-content div[style*="background:#F8FAFC"],
.detleng-content div[style*="background: #f8fafc"] {
  background: var(--dt-surface) !important;
}

.detleng-content div[style*="background:#0F52BA"],
.detleng-content div[style*="background:blue"] {
  background: linear-gradient(125deg, #092f5e, var(--dt-blue)) !important;
}

.detleng-content div[style*="border-left"] {
  border-left: 4px solid var(--dt-gold) !important;
}

.detleng-card {
  padding: 28px !important;
  background: var(--dt-surface) !important;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.detleng-card:hover {
  border-color: #b7cce4 !important;
  box-shadow: var(--dt-shadow) !important;
  transform: translateY(-4px);
}

.detleng-grid,
.detleng-services,
.detleng-flow {
  gap: 20px !important;
}

.detleng-header,
.detleng-hero {
  position: relative;
  padding: 54px 44px !important;
  overflow: hidden;
  border: 1px solid var(--dt-line) !important;
  border-radius: 24px !important;
  background: radial-gradient(circle at 82% 18%, rgba(7, 84, 166, 0.12), transparent 33%), linear-gradient(135deg, #fff 0%, #f4f8fc 100%) !important;
  box-shadow: var(--dt-shadow-small);
}

.detleng-header::before,
.detleng-hero::before {
  position: absolute;
  inset: 0 auto auto 0;
  width: 74px;
  height: 74px;
  border-top: 3px solid var(--dt-gold);
  border-left: 3px solid var(--dt-gold);
  border-radius: 24px 0 0;
  content: "";
}

.service-link,
.case-link,
.cta-button,
.detleng-buttons a,
.detleng-content a[style*="padding"] {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px !important;
  color: #fff !important;
  background: var(--dt-blue) !important;
  border: 1px solid var(--dt-blue) !important;
  border-radius: var(--dt-radius-small) !important;
  box-shadow: 0 9px 24px rgba(7, 84, 166, 0.18) !important;
  font-size: 0.9rem !important;
  font-weight: 700 !important;
  text-decoration: none !important;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.service-link:hover,
.case-link:hover,
.cta-button:hover,
.detleng-buttons a:hover,
.detleng-content a[style*="padding"]:hover {
  color: #fff !important;
  background: var(--dt-blue-dark) !important;
  border-color: var(--dt-blue-dark) !important;
  transform: translateY(-2px);
}

.detleng-ecosystem-block {
  width: min(var(--dt-content-width), calc(100% - 40px));
  max-width: var(--dt-content-width) !important;
  margin: 0 auto 52px !important;
  padding: 52px 0 !important;
  background: transparent !important;
  border-top: 1px solid var(--dt-line);
}

.detleng-ecosystem-block > div[style*="display:grid"] > div {
  padding: 26px 22px !important;
  background: var(--dt-surface) !important;
  border: 1px solid var(--dt-line) !important;
  border-radius: var(--dt-radius) !important;
  box-shadow: var(--dt-shadow-small) !important;
  text-align: left;
}

.detleng-ecosystem-block h2,
.detleng-ecosystem-block h3 { color: var(--dt-ink) !important; }

.detleng-ecosystem-block p { color: var(--dt-muted) !important; }

/* The existing mailto payload and behavior are unchanged; appearance only. */
.detleng-sticky-btn {
  left: 20px !important;
  bottom: 20px !important;
  min-height: 50px;
  padding: 0 19px !important;
  color: #2e260b !important;
  background: var(--dt-gold) !important;
  border: 1px solid rgba(114, 87, 0, 0.12) !important;
  border-radius: 999px !important;
  box-shadow: 0 10px 30px rgba(91, 70, 4, 0.25) !important;
  font-family: "Segoe UI", Arial, sans-serif !important;
  font-size: 0.85rem !important;
  font-weight: 800 !important;
  line-height: 1.2;
  animation: none !important;
  transition: transform 0.2s ease, background-color 0.2s ease !important;
}

.detleng-sticky-btn:hover {
  color: #2e260b !important;
  background: #ffcc28 !important;
  transform: translateY(-3px) !important;
}

:focus-visible {
  outline: 3px solid rgba(242, 183, 5, 0.78) !important;
  outline-offset: 3px !important;
}

@media (max-width: 900px) {
  .detleng-content { padding: 54px 0 72px !important; }
  .detleng-header, .detleng-hero { padding: 42px 30px !important; }
  .detleng-grid, .detleng-services { grid-template-columns: 1fr !important; }
}

@media (max-width: 768px) {
  :root { --dt-nav-height: 68px; }

  body { font-size: 16px; }

  .detleng-nav { padding: 0 14px !important; }

  .detleng-logo img { max-height: 40px !important; }

  .menu-icon {
    width: 44px;
    height: 44px;
    padding: 9px !important;
    border: 1px solid var(--dt-line);
    border-radius: 10px;
    background: #fff;
  }

  .menu-links {
    padding: 14px !important;
    background: #fff !important;
    border-bottom: 1px solid var(--dt-line) !important;
    box-shadow: 0 16px 25px rgba(0, 0, 0, 0.08) !important;
  }

  .menu-links a { padding: 13px 15px !important; }

  .detleng-content,
  .detleng-ecosystem-block {
    width: min(100% - 28px, var(--dt-content-width)) !important;
  }

  .detleng-content { padding: 40px 0 62px !important; }

  .detleng-content h1 { font-size: clamp(2.35rem, 13vw, 3.2rem) !important; }

  .detleng-content h2 { margin-top: 48px !important; }

  .detleng-header,
  .detleng-hero { padding: 34px 22px !important; }

  .detleng-card { padding: 22px !important; }

  .detleng-content div[style*="padding:40px"],
  .detleng-content div[style*="padding: 40px"] { padding: 26px !important; }

  .detleng-sticky-btn {
    left: 12px !important;
    bottom: 12px !important;
    min-height: 46px;
    max-width: calc(100vw - 100px);
    padding: 0 15px !important;
    font-size: 0.76rem !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Phase 2 refinement: simpler editorial rhythm and Platform-style footer. */
.detleng-content {
  width: min(1080px, calc(100% - 40px)) !important;
  padding-top: 58px !important;
}

.detleng-content h1 {
  max-width: 780px;
  font-size: clamp(2.45rem, 4.5vw, 3.8rem) !important;
  letter-spacing: -0.045em !important;
}

.detleng-content h2 {
  margin-top: 52px !important;
  font-size: clamp(1.55rem, 2.5vw, 2.2rem) !important;
}

.detleng-content p,
.detleng-content ul,
.detleng-content ol {
  max-width: 820px;
}

.detleng-card,
.detleng-content div[style*="border-radius"] {
  box-shadow: 0 5px 18px rgba(17, 37, 62, 0.045) !important;
}

.detleng-content hr { margin: 52px 0 !important; }

/* Earlier repeated ecosystem/signature presentations are retained in source
   but replaced visually by one consistent product-ecosystem footer. */
.detleng-ecosystem-block,
.detleng-author-signature {
  display: none !important;
}

.detleng-site-footer {
  margin-top: 30px;
  padding: 58px 0 22px;
  color: #fff;
  background: #0e1929;
}

.detleng-footer-inner {
  width: min(var(--dt-content-width), calc(100% - 40px));
  margin-inline: auto;
}

.detleng-footer-main {
  display: grid;
  grid-template-columns: minmax(230px, 0.8fr) minmax(0, 1.2fr);
  gap: 72px;
  align-items: start;
  padding-bottom: 42px;
}

.detleng-footer-brand img {
  width: auto;
  max-height: 46px;
  padding: 5px;
  background: #fff;
}

.detleng-footer-brand p {
  margin: 18px 0 0;
  color: #9eabbc;
  font-size: 0.98rem;
}

.detleng-footer-links h2 {
  margin: 4px 0 17px;
  color: #9eabbc;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.detleng-footer-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 11px 25px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.detleng-footer-links a {
  color: #e8edf4;
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.detleng-footer-links a::after {
  margin-left: 5px;
  color: #ffd24a;
  content: "↗";
}

.detleng-footer-links a:hover { color: #ffd24a; }

.detleng-footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 18px;
  border-top: 1px solid #263347;
  color: #ffffff;
  font-size: 0.76rem;
}

.detleng-footer-bottom p {
  margin: 0;
  color: 510 !important;
}

.detleng-sticky-btn {
  gap: 9px !important;
  min-width: 132px;
  justify-content: center !important;
}

.detleng-support-icon {
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-size: 0.76rem;
  line-height: 1;
}

@media (max-width: 768px) {
  .detleng-content {
    width: min(100% - 28px, 1080px) !important;
    padding-top: 34px !important;
  }

  .detleng-content h1 { font-size: clamp(2.2rem, 12vw, 3rem) !important; }
  .detleng-content h2 { margin-top: 42px !important; }

  .detleng-footer-inner { width: min(100% - 28px, var(--dt-content-width)); }

  .detleng-footer-main {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-bottom: 32px;
  }

  .detleng-footer-links ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 18px;
  }

  .detleng-footer-bottom { flex-direction: column; }

  .detleng-sticky-btn {
    min-width: 112px;
    max-width: none;
  }
}