/* ==========================================================================
   KHH Analytics — stylesheet
   ========================================================================== */

:root {
  --bg:          #080A0F;
  --bg-alt:      #0C1017;
  --surface:     #11161F;
  --surface-2:   #161C27;
  --line:        rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);

  --text:        #E8EBF2;
  --heading:     #F6F3EC;
  --muted:       #9AA3B4;
  --faint:       #6E7789;

  --accent:      #C9A86A;
  --accent-soft: #E0C692;
  --accent-dim:  rgba(201, 168, 106, 0.12);

  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --wrap: 1180px;
  --gutter: 24px;
  --radius: 4px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.68;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a { color: inherit; }

::selection {
  background: rgba(201, 168, 106, 0.28);
  color: #fff;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #0a0a0a;
  padding: 12px 20px;
  z-index: 200;
  font-weight: 600;
}
.skip:focus { left: 12px; top: 12px; }

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

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* --- Typography ---------------------------------------------------------- */

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--heading);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 6.2vw, 4.4rem);
  line-height: 1.07;
  letter-spacing: -0.028em;
}

h1 em {
  font-style: italic;
  color: var(--accent-soft);
  font-weight: 400;
}

h2 {
  font-size: clamp(1.85rem, 3.6vw, 2.85rem);
  line-height: 1.15;
}

h3 { font-size: 1.2rem; line-height: 1.35; }
h4 { font-size: 0.82rem; }

p { margin: 0; }

.eyebrow,
.section-label {
  font-family: var(--sans);
  font-size: 0.735rem;
  font-weight: 600;
  letter-spacing: 0.19em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 22px;
}

.section-label { color: var(--faint); }

.lede {
  font-size: clamp(1.02rem, 1.55vw, 1.22rem);
  line-height: 1.62;
  color: var(--muted);
  max-width: 58ch;
  margin-top: 26px;
}

.section-sub {
  color: var(--muted);
  max-width: 56ch;
  margin-top: 16px;
  font-size: 1.02rem;
}

.prose p {
  color: var(--muted);
  margin-bottom: 22px;
  max-width: 62ch;
  font-size: 1.04rem;
}
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--text); font-weight: 600; }
.prose em { color: var(--accent-soft); font-style: italic; }

/* --- Header -------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 10, 15, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(8, 10, 15, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--heading);
  flex-shrink: 0;
}

.brand-mark {
  width: 28px;
  height: 28px;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-text {
  font-family: var(--sans);
  font-size: 0.83rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  white-space: nowrap;
}

.brand-sep {
  display: inline-block;
  width: 1px;
  height: 0.72em;
  background: var(--line-strong);
  margin: 0 0.6em;
  vertical-align: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav a {
  text-decoration: none;
  font-size: 0.895rem;
  color: var(--muted);
  transition: color 0.2s ease;
  position: relative;
  padding: 4px 0;
}

.nav a:hover { color: var(--text); }

.nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.nav a:not(.nav-cta):hover::after { width: 100%; }

.nav-cta {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 9px 20px !important;
  color: var(--text) !important;
  transition: border-color 0.25s ease, background 0.25s ease, color 0.25s ease;
}
.nav-cta:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent-soft) !important;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  width: 42px;
  height: 38px;
  cursor: pointer;
  padding: 0;
  place-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 17px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child  { transform: translateY(-3.25px) rotate(-45deg); }

/* --- Buttons ------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 0.925rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.25s var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #0B0D12;
  font-weight: 600;
}
.btn-primary:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-soft);
  background: var(--accent-dim);
}

/* --- Hero ---------------------------------------------------------------- */

.hero {
  position: relative;
  padding: clamp(80px, 13vh, 140px) 0 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(ellipse 85% 70% at 50% 28%, #000 25%, transparent 78%);
  mask-image: radial-gradient(ellipse 85% 70% at 50% 28%, #000 25%, transparent 78%);
}

.hero-glow {
  position: absolute;
  top: -22%;
  left: 50%;
  transform: translateX(-50%);
  width: min(1100px, 130%);
  height: 620px;
  background: radial-gradient(ellipse at center, rgba(201, 168, 106, 0.085) 0%, transparent 62%);
  filter: blur(8px);
}

.hero-chart {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 58%;
  opacity: 0.55;
}

.chart-line {
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: draw 2.6s var(--ease) 0.3s forwards;
}
.chart-line--muted {
  opacity: 0.32;
  animation-delay: 0.55s;
}
.chart-fill {
  opacity: 0;
  animation: fade 1.6s ease 1.5s forwards;
}

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }

.hero-inner {
  position: relative;
  z-index: 1;
  padding-bottom: clamp(64px, 9vw, 104px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

/* --- Pillars ------------------------------------------------------------- */

.pillars {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.pillars li {
  background: rgba(17, 22, 31, 0.78);
  backdrop-filter: blur(6px);
  padding: 34px 30px 36px;
}

.pillars h3 {
  font-family: var(--sans);
  font-size: 0.79rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.pillars p {
  color: var(--muted);
  font-size: 0.955rem;
  line-height: 1.6;
}

/* --- Sections ------------------------------------------------------------ */

.section {
  padding: clamp(84px, 11vw, 138px) 0;
  position: relative;
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--line);
}

.section-head {
  margin-bottom: clamp(48px, 6vw, 72px);
  max-width: 720px;
}

.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(40px, 6vw, 88px);
  align-items: start;
}

.col-sticky {
  position: sticky;
  top: 116px;
}

/* --- Steps --------------------------------------------------------------- */

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
  border-top: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  column-gap: clamp(24px, 5vw, 64px);
  row-gap: 0;
  padding: 38px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.35s ease;
}

.steps li:hover { background: rgba(255, 255, 255, 0.017); }

/* Explicit placement: the number spans both rows in column 1, while the
   heading and body stack in column 2. Without this, three children
   auto-place into a 2-column grid and the paragraph falls under the number. */
.step-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--serif);
  font-size: 1.55rem;
  color: var(--accent);
  opacity: 0.75;
  line-height: 1.35;
  font-variant-numeric: tabular-nums;
}

.steps h3 {
  grid-column: 2;
  grid-row: 1;
  margin-bottom: 12px;
}

.steps p {
  grid-column: 2;
  grid-row: 2;
  color: var(--muted);
  font-size: 1.0rem;
  max-width: 68ch;
}

/* --- Cards --------------------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px 36px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.35s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.45s var(--ease);
}

.card:hover {
  border-color: var(--line-strong);
  background: var(--surface-2);
  transform: translateY(-3px);
}
.card:hover::before { transform: scaleX(1); }

.card h3 { margin-bottom: 14px; }

.card p {
  color: var(--muted);
  font-size: 0.97rem;
  line-height: 1.62;
}

/* --- Contact ------------------------------------------------------------- */

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(40px, 6vw, 80px);
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(40px, 5.5vw, 68px);
  position: relative;
  overflow: hidden;
}

.contact-panel::after {
  content: "";
  position: absolute;
  top: -55%;
  right: -12%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(201, 168, 106, 0.09) 0%, transparent 65%);
  pointer-events: none;
}

.contact-copy .btn { margin-top: 32px; }

.contact-details {
  display: grid;
  gap: 32px;
  position: relative;
  z-index: 1;
  padding-top: 6px;
}

.detail h4 {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}

.detail p {
  color: var(--text);
  font-size: 0.99rem;
  line-height: 1.65;
}

.detail a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.detail a:hover {
  color: var(--accent-soft);
  border-bottom-color: rgba(201, 168, 106, 0.45);
}

/* --- 404 ----------------------------------------------------------------- */

.notfound {
  position: relative;
  display: flex;
  align-items: center;
  min-height: calc(100vh - 72px - 150px);
  padding: clamp(72px, 12vh, 132px) 0;
  overflow: hidden;
}

.notfound-inner {
  position: relative;
  z-index: 1;
}

.notfound-code {
  font-family: var(--serif);
  font-size: clamp(4.5rem, 14vw, 9rem);
  line-height: 0.85;
  font-weight: 600;
  letter-spacing: -0.045em;
  color: var(--accent);
  opacity: 0.16;
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-variant-numeric: tabular-nums;
  user-select: none;
}

.notfound h1 {
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  line-height: 1.1;
}

.notfound .eyebrow { margin-bottom: 18px; }
.notfound .lede { max-width: 52ch; }

.notfound-links {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: clamp(44px, 6vw, 64px);
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.notfound-links a {
  text-decoration: none;
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s ease;
}
.notfound-links a:hover { color: var(--accent-soft); }

/* --- Footer -------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 56px 0 44px;
}

.site-footer--slim { padding: 34px 0 30px; }
.site-footer--slim .footer-top { padding-bottom: 24px; }

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
}

.footer-nav a {
  text-decoration: none;
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s ease;
}
.footer-nav a:hover { color: var(--accent-soft); }

.disclaimer {
  margin-top: 32px;
  font-size: 0.78rem;
  line-height: 1.72;
  color: var(--faint);
  max-width: 96ch;
}
.disclaimer strong { color: var(--muted); font-weight: 600; }

.copyright {
  margin-top: 28px;
  font-size: 0.8rem;
  color: var(--faint);
}

/* --- Reveal animation ---------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.hero .reveal:nth-child(2) { transition-delay: 0.06s; }
.hero .reveal:nth-child(3) { transition-delay: 0.12s; }
.hero .reveal:nth-child(4) { transition-delay: 0.18s; }

.pillars li:nth-child(2) { transition-delay: 0.08s; }
.pillars li:nth-child(3) { transition-delay: 0.16s; }

.cards .card:nth-child(3n+2) { transition-delay: 0.07s; }
.cards .card:nth-child(3n+3) { transition-delay: 0.14s; }

/* --- Responsive ---------------------------------------------------------- */

@media (max-width: 960px) {
  .grid-2 { grid-template-columns: 1fr; }
  .col-sticky { position: static; }
  .contact-panel { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
  body { font-size: 16px; }

  .nav-toggle { display: grid; }

  .nav {
    position: fixed;
    inset: 72px 0 auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(8, 10, 15, 0.98);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 24px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.28s ease, transform 0.28s var(--ease), visibility 0.28s;
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav a {
    padding: 15px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--line);
  }
  .nav a:not(.nav-cta)::after { display: none; }

  .nav-cta {
    border: 1px solid var(--line-strong) !important;
    text-align: center;
    margin-top: 18px;
    padding: 13px 20px !important;
  }

  .steps li { grid-template-columns: 1fr; row-gap: 8px; }
  .steps li > * { grid-column: 1; grid-row: auto; }
  .step-num { font-size: 1.15rem; }
  .hero-chart { height: 42%; opacity: 0.4; }
  .btn { width: 100%; justify-content: center; }
  .hero-actions { flex-direction: column; }
  .footer-top { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .chart-line { stroke-dashoffset: 0; }
  .chart-fill { opacity: 1; }
}