/* NabuX - site stylesheet */

:root {
  --ivory: #f8f4ec;
  --ivory-deep: #efe8da;
  --paper: #fffdf8;
  --gold: #b8963e;
  --gold-soft: #d7c38f;
  --gold-line: #e2d4ad;
  --gold-tint: rgba(184, 150, 62, 0.28);
  --compare: #8DB8DB;
  --compare-tint: #e3eef7;
  --view: #AF7F90;
  --view-tint: #f1e3e8;
  --review: #75B5B8;
  --hub: #BBA27C;
  --reserve-1: #99B39A;
  --reserve-2: #AAA4BD;
  --sky-line: #d5e6f5;
  --blue-deep: #2f5d8a;
  --navy: #15233b;
  --navy-soft: #3a4a66;
  --ink-muted: #6b7386;
  --major: #8c2f2f;
  --medium: #a86b1f;
  --minor: #4b6a8a;
  --display: "Cormorant Garamond", "Times New Roman", serif;
  --body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --gutter: 16px;
  --max: 1080px;
  --radius: 4px;
  --shadow: 0 10px 30px -18px rgba(21, 35, 59, 0.35), 0 2px 6px -2px rgba(21, 35, 59, 0.08);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ivory);
  background-image: radial-gradient(ellipse 120% 60% at 50% -10%, #fffdf6 0%, var(--ivory) 70%);
  background-attachment: fixed;
  color: var(--navy);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* paper grain, very light */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

main, .site-header, .site-footer { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 500;
  color: var(--navy);
  line-height: 1.1;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.5rem, 7vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4.2vw, 2.6rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.6rem); letter-spacing: -0.005em; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--navy);
  text-decoration: underline;
  text-decoration-color: var(--gold-soft);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s var(--ease);
}
a:hover { text-decoration-color: var(--gold); }

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

ul, ol { padding-left: 1.2em; margin: 0 0 1em; }
li { margin-bottom: 0.4em; }

small, .muted { color: var(--ink-muted); }

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

/* ---------- logo ---------- */

.logo { display: block; height: 36px; width: auto; }
.logo-n { fill: var(--navy); }
.logo-word { font-family: var(--display); font-weight: 600; fill: var(--navy); letter-spacing: 0.02em; }
.logo-x { fill: var(--gold); }
.logo-diamond { fill: none; stroke: var(--gold); stroke-width: 1.2; }
.logo-core { fill: var(--gold); }

.site-footer .logo { height: 30px; }
.band-navy .logo-n, .site-footer.dark .logo-n { fill: var(--ivory); }

/* ---------- header ---------- */

.site-header {
  background: var(--ivory);
  border-bottom: 1px solid var(--gold-line);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(248, 244, 236, 0.82);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px -20px rgba(21, 35, 59, 0.5);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand { display: inline-flex; align-items: center; text-decoration: none; }

.nav-toggle {
  appearance: none;
  background: none;
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
  padding: 10px 10px;
  color: var(--navy);
  cursor: pointer;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.2s var(--ease);
}

.nav-toggle:hover { border-color: var(--gold); }

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--navy);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle.is-open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0.4); }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.site-nav {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  background: var(--ivory);
  border-bottom: 1px solid var(--gold-line);
  padding: 8px var(--gutter) 16px;
}

.site-nav.is-open { display: block; }

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.site-nav li { margin: 0; }

.site-nav a {
  display: inline-block;
  position: relative;
  padding: 10px 0;
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy-soft);
  transition: color 0.2s var(--ease);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 6px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.site-nav a:hover { color: var(--navy); }
.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--navy); }

@media (min-width: 820px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: block;
    position: static;
    background: none;
    border: 0;
    padding: 0;
  }
  .site-nav ul { flex-direction: row; gap: 32px; }
  .site-nav a { padding: 6px 0; }
  .site-nav a::after { bottom: 2px; }
}

/* ---------- sections ---------- */

section { padding: 64px 0; }

@media (min-width: 820px) { section { padding: 104px 0; } }

.hero { padding-top: 80px; }
@media (min-width: 820px) { .hero { padding-top: 112px; } }

.kicker {
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
}

.hero h1 { max-width: 16ch; }

.lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--navy-soft);
  max-width: 56ch;
}

.rule {
  width: 56px;
  height: 1px;
  background: var(--gold);
  margin: 28px 0;
}

.rule.center { margin-left: auto; margin-right: auto; }

/* gold hairline divider between plain sections */
.hairline {
  border: 0;
  height: 1px;
  margin: 0 auto;
  max-width: calc(var(--max) - 2 * var(--gutter));
  background: linear-gradient(90deg, transparent, var(--gold-line) 15%, var(--gold-line) 85%, transparent);
  position: relative;
  overflow: visible;
}

.hairline::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  background: var(--ivory);
  border: 1px solid var(--gold);
  transform: translate(-50%, -50%) rotate(45deg);
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--navy);
  color: var(--navy);
  background: transparent;
  cursor: pointer;
  font-family: var(--body);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); border-color: var(--gold); }
.btn:active { transform: translateY(0); box-shadow: none; }
.btn.primary { background: var(--navy); color: var(--ivory); }
.btn.primary:hover { background: #1e3050; border-color: #1e3050; }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none; box-shadow: none; }

.band {
  background: var(--ivory-deep);
  border-top: 1px solid var(--gold-line);
  border-bottom: 1px solid var(--gold-line);
}

.band-navy {
  background: var(--navy);
  background-image: radial-gradient(ellipse 80% 70% at 100% 0%, #233656 0%, var(--navy) 70%);
  color: var(--ivory);
}
.band-navy h2, .band-navy h3 { color: var(--ivory); }
.band-navy .kicker { color: var(--gold-soft); }
.band-navy p, .band-navy li { color: #dcd6c8; }
.band-navy a { color: var(--ivory); text-decoration-color: var(--gold-soft); }
.band-navy .btn { border-color: var(--gold-soft); color: var(--ivory); }
.band-navy .btn:hover { border-color: var(--gold); background: rgba(255, 255, 255, 0.05); }

.section-head { max-width: 60ch; margin-bottom: 40px; }

/* ---------- grids and cards ---------- */

.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--paper);
  border: 1px solid var(--gold-tint);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: box-shadow 0.3s var(--ease), transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.card:hover {
  box-shadow: var(--shadow);
  border-color: var(--gold-soft);
  transform: translateY(-2px);
}

.card h3 { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card li { color: var(--navy-soft); }

.card .num {
  font-family: var(--display);
  font-size: 2.2rem;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 14px;
}

.icon {
  width: 36px;
  height: 36px;
  display: block;
  margin-bottom: 18px;
  color: var(--gold);
}

/* ---------- steps ---------- */

.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }

.steps li {
  position: relative;
  padding: 26px 0 26px 64px;
  border-top: 1px solid var(--gold-line);
  counter-increment: step;
  margin: 0;
}

.steps li:last-child { border-bottom: 1px solid var(--gold-line); }

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 24px;
  font-family: var(--display);
  font-size: 1.7rem;
  color: var(--gold);
}

.steps h3 { margin-bottom: 6px; font-size: 1.35rem; }
.steps p { color: var(--navy-soft); }
.steps ul { color: var(--navy-soft); margin-top: 8px; }

/* ---------- grades ---------- */

.grades { display: grid; gap: 16px; grid-template-columns: 1fr; margin-top: 14px; }
@media (min-width: 640px) { .grades { grid-template-columns: repeat(3, 1fr); } }

.grade {
  border-left: 3px solid var(--gold);
  padding: 4px 0 4px 16px;
}

.grade.major { border-left-color: var(--major); }
.grade.medium { border-left-color: var(--medium); }
.grade.minor { border-left-color: var(--minor); }

.grade strong {
  display: block;
  font-family: var(--display);
  font-size: 1.35rem;
  margin-bottom: 4px;
}

.grade p { color: var(--navy-soft); font-size: 0.95rem; }

.stats {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

@media (min-width: 640px) { .stats { grid-template-columns: repeat(4, 1fr); } }

.stats li { margin: 0; border-top: 1px solid var(--gold-line); padding-top: 12px; }

.stat {
  display: block;
  font-family: var(--display);
  font-size: 2.2rem;
  line-height: 1;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}

.stat + small { display: block; margin-top: 6px; letter-spacing: 0.04em; }

/* ---------- fact lists ---------- */

.facts { margin: 0; }

.facts div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 18px 0;
  border-top: 1px solid var(--gold-line);
}

.facts div:last-child { border-bottom: 1px solid var(--gold-line); }

.facts dt { font-weight: 500; color: var(--navy); }
.facts dd { margin: 0; color: var(--navy-soft); }

@media (min-width: 640px) {
  .facts div { grid-template-columns: 220px 1fr; gap: 24px; }
}

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; }

table.plain {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

table.plain th, table.plain td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--gold-line);
  vertical-align: top;
}

table.plain th {
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
}

/* ---------- forms ---------- */

form.contact { display: grid; gap: 18px; max-width: 560px; }

.field { display: grid; gap: 6px; }

.field label { font-size: 0.85rem; letter-spacing: 0.04em; color: var(--navy-soft); }

.field input, .field textarea {
  width: 100%;
  font: inherit;
  padding: 12px 14px;
  border: 1px solid var(--gold-line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--navy);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(184, 150, 62, 0.18);
}

.notice {
  border: 1px dashed var(--gold);
  padding: 12px 16px;
  font-size: 0.9rem;
  color: var(--navy-soft);
  background: var(--paper);
  border-radius: var(--radius);
}

/* ---------- prose pages ---------- */

.prose { max-width: 68ch; }
.prose h2 { margin-top: 2em; }
.prose h2:first-child { margin-top: 0; }

/* ---------- hero split and illustration ---------- */

.split { display: grid; gap: 48px; grid-template-columns: 1fr; align-items: center; }
@media (min-width: 820px) { .split { grid-template-columns: 1.05fr 0.95fr; } }

.hero-art {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  margin: 0 auto;
  overflow: visible;
}

.hero-art .ink { stroke: var(--navy); fill: none; stroke-width: 1; stroke-linecap: round; stroke-linejoin: round; }
.hero-art .faint { stroke: var(--navy-soft); opacity: 0.45; }
.hero-art .old { stroke: var(--ink-muted); stroke-dasharray: 3 3; opacity: 0.7; }
.hero-art .gold { stroke: var(--gold); fill: none; stroke-width: 1; }
.hero-art .sheet { fill: var(--paper); stroke: var(--navy); stroke-width: 1; }
.hero-art .pin { fill: var(--gold); stroke: var(--paper); stroke-width: 1.5; }
.hero-art .pin-ring { fill: none; stroke: var(--gold); stroke-width: 1; opacity: 0; transform-box: fill-box; transform-origin: center; }
.hero-art .tb { fill: var(--navy); font-family: var(--body); font-size: 6px; letter-spacing: 0.08em; }
.hero-art .gold-text { fill: var(--gold); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--gold-line);
  padding: 40px 0 48px;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.site-footer .wrap {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.site-footer .foot-brand { display: flex; align-items: center; gap: 16px; }
.site-footer .foot-brand .brand { text-decoration: none; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer li { margin: 0; }
.site-footer a { color: var(--navy-soft); text-decoration: none; transition: color 0.2s var(--ease); }
.site-footer a:hover { color: var(--navy); }

@media (min-width: 640px) {
  .site-footer .wrap { flex-direction: row; justify-content: space-between; align-items: center; }
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- motion (only when the reader allows it) ---------- */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  }
  .reveal.is-visible { opacity: 1; transform: none; }

  /* the card keeps its hover lift after reveal */
  .card.reveal.is-visible { transition: opacity 0.5s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease); }

  .hero-art .draw {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: draw 1.2s var(--ease) forwards;
  }
  .hero-art .draw.late { animation-delay: 0.35s; }
  .hero-art .draw.later { animation-delay: 0.7s; }

  .hero-art .pin {
    opacity: 0;
    transform-box: fill-box;
    transform-origin: center;
    animation: pin-in 0.45s var(--ease) 1.15s forwards;
  }
  .hero-art .pin-ring { animation: ring 0.9s ease-out 1.55s 1 forwards; }
  .hero-art .pin.p2 { animation-delay: 1.3s; }
  .hero-art .pin-ring.p2 { animation-delay: 1.7s; }
  .hero-art .pin.p3 { animation-delay: 1.45s; }
  .hero-art .pin-ring.p3 { animation-delay: 1.85s; }

  .hero-art .fade { opacity: 0; animation: fade-in 0.6s var(--ease) 1.2s forwards; }
}

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes pin-in {
  from { opacity: 0; transform: scale(0.4); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes ring {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 0; transform: scale(2.6); }
}
@keyframes fade-in { to { opacity: 1; } }

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

/* ---------- product logos (light edition, IFC_Studio/branding) ---------- */
.product-logo { display: block; height: 72px; width: auto; max-width: 100%; margin: 0 0 18px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.series-strip { display: grid; gap: 18px; grid-template-columns: 1fr; }
@media (min-width: 720px) { .series-strip { grid-template-columns: 1fr 1fr; } }
.series-strip .card { display: flex; align-items: center; gap: 18px; padding: 18px 22px; }
.series-strip .card img { height: 52px; width: auto; flex: none; }
.series-strip .card h3 { margin: 0 0 4px; font-size: 1.3rem; }
.series-strip .card p { margin: 0; font-size: 0.9rem; color: var(--navy-soft); }
.series-strip .card.compare { border-color: var(--compare); background: linear-gradient(160deg, var(--compare-tint), var(--paper) 60%); }
.series-strip .card.view { border-color: var(--view); background: linear-gradient(160deg, var(--view-tint), var(--paper) 60%); }
a.card { text-decoration: none; color: inherit; }
a.card:hover h3 { color: var(--gold); }
.slogan { font-family: var(--display); font-style: italic; font-size: 1.25rem; color: var(--gold); margin: -6px 0 26px; max-width: 46ch; line-height: 1.4; }