/* ════════════════════════════════════════════════════════════════
   ILLUMISEE CONSULTING — Shared Design System
   Editorial · Minimal · Brand-accurate
   ════════════════════════════════════════════════════════════════ */

/* ─── Design Tokens (from brand guide) ────────────────────────── */
:root {
  /* Brand palette — exact hex from brand identity */
  --navy:        #0F2A44;
  --slate:       #4D5B6E;
  --mist:        #E6E9EE;
  --gold:        #C9A96E;
  --gold-deep:   #9C7B3F; /* deeper gold for small text on light backgrounds (contrast) */
  --cream:       #F5EFE4;

  /* Working tints */
  --navy-deep:   #081B2D;
  --gold-soft:   rgba(201, 169, 110, 0.14);
  --gold-faint:  rgba(201, 169, 110, 0.06);
  --cream-warm:  #FAF6EE;
  --line:        rgba(15, 42, 68, 0.08);
  --line-gold:   rgba(201, 169, 110, 0.22);
  --line-light:  rgba(250, 246, 238, 0.16);

  /* Typography */
  --font-sans:   'Montserrat', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-cn:     'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Layout */
  --max-w:       1180px;
  --pad-x:       2.5rem;
}

/* ─── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--cream);
  color: var(--navy);
  font-size: 15px;
  line-height: 1.7;
  font-weight: 400;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
:lang(zh), .cn { font-family: var(--font-cn); }

/* ─── Typography helpers ─────────────────────────────────────── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold-deep);
}
.eyebrow::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--gold);
  display: inline-block;
}
.eyebrow.center { justify-content: center; }
.eyebrow.center::after {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--gold);
  display: inline-block;
}

.display {
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--navy);
}
.display .accent { color: var(--gold); font-weight: 400; }
.display .punct  { color: var(--gold); }

.h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--navy);
}
.h2.light { color: var(--cream); }

.h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--navy);
  line-height: 1.35;
}

.lead {
  font-size: 1.025rem;
  color: var(--slate);
  line-height: 1.75;
  font-weight: 400;
  max-width: 56ch;
}
.lead.light { color: rgba(245, 239, 228, 0.7); }
.lead.center { margin-left: auto; margin-right: auto; }

.small {
  font-size: 0.85rem;
  color: var(--slate);
  line-height: 1.7;
}

/* ─── Container ──────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  width: 100%;
}

.section {
  padding: 7rem 0;
}
.section.tight { padding: 5rem 0; }
.section.deep  { padding: 9rem 0; }

.section-head {
  margin-bottom: 4rem;
}
.section-head.center { text-align: center; }
.section-head.center .eyebrow { justify-content: center; }
.section-head.center .lead { margin-left: auto; margin-right: auto; }
.section-head .h2 { margin-top: 1.25rem; }
.section-head .lead { margin-top: 1.4rem; }

/* ─── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 1rem 2rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
}
.btn-primary {
  background: var(--navy);
  color: var(--cream);
  border-color: var(--navy);
}
.btn-primary:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--cream);
}
.btn-ghost {
  background: transparent;
  color: var(--navy);
  border-color: rgba(15, 42, 68, 0.25);
}
.btn-ghost:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--cream);
}
.btn-ghost-light {
  background: transparent;
  color: var(--cream);
  border-color: rgba(245, 239, 228, 0.35);
}
.btn-ghost-light:hover {
  background: var(--cream);
  color: var(--navy);
  border-color: var(--cream);
}
.btn-gold {
  background: var(--gold);
  color: var(--cream);
  border-color: var(--gold);
}
.btn-gold:hover {
  background: transparent;
  color: var(--gold);
}
.btn .arrow {
  transition: transform 0.3s ease;
}
.btn:hover .arrow { transform: translateX(4px); }

/* ─── Navigation ─────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem var(--pad-x);
  background: rgba(245, 239, 228, 0.85);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  transition: box-shadow 0.3s ease, padding 0.3s ease;
}
.nav.scrolled {
  box-shadow: 0 1px 0 var(--line), 0 8px 32px rgba(15, 42, 68, 0.04);
  padding: 1rem var(--pad-x);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  line-height: 1;
}
.nav-brand-mark {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.nav-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
}
.nav-brand-wordmark {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--navy);
}
.nav-brand-wordmark .see { color: var(--gold); }
.nav-brand-sub {
  font-size: 0.48rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--slate);
}
.nav-links {
  display: flex;
  list-style: none;
  gap: 2.4rem;
}
.nav-links a {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate);
  position: relative;
  padding: 0.4rem 0;
  transition: color 0.25s ease;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width 0.3s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--navy);
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-cta {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--gold);
  transition: all 0.28s ease;
}
.nav-cta:hover {
  background: var(--gold);
  color: var(--cream);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.4rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--navy);
  transition: all 0.3s ease;
}

/* ─── Footer ─────────────────────────────────────────────────── */
footer {
  background: var(--navy-deep);
  color: rgba(245, 239, 228, 0.6);
  padding: 4rem var(--pad-x) 2rem;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.footer-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--line-light);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.footer-brand-mark { width: 36px; height: 36px; flex-shrink: 0; }
.footer-brand-text { display: flex; flex-direction: column; gap: 0.2rem; }
.footer-brand-wordmark {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cream);
}
.footer-brand-wordmark .see { color: var(--gold); }
.footer-brand-sub {
  font-size: 0.5rem;
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(245, 239, 228, 0.5);
}
.footer-brand-cn {
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: rgba(245, 239, 228, 0.4);
  margin-top: 0.4rem;
}
.footer-col h4 {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.2rem;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.7rem; }
.footer-col a {
  font-size: 0.8rem;
  color: rgba(245, 239, 228, 0.65);
  transition: color 0.25s ease;
}
.footer-col a:hover { color: var(--gold); }
.footer-bottom {
  padding-top: 1.5rem;
  font-size: 0.7rem;
  color: rgba(245, 239, 228, 0.3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-tagline {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(201, 169, 110, 0.5);
}

/* ─── Reusable: rule + decorations ───────────────────────────── */
.gold-rule {
  width: 40px;
  height: 1px;
  background: var(--gold);
  margin: 0 auto;
}
.gold-rule.left { margin-left: 0; }

/* Fade-in on scroll */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.in {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 960px) {
  :root { --pad-x: 1.5rem; }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .section { padding: 5rem 0; }
  .section.deep { padding: 6rem 0; }
  .footer-row { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 600px) {
  .nav { padding: 1rem var(--pad-x); }
  .nav-brand-sub { display: none; }
}

/* ─── Mobile nav drawer ──────────────────────────────────────── */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(245, 239, 228, 0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.4rem;
  transform: translateY(-100%);
  transition: transform 0.4s ease;
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a {
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
}
.mobile-menu a:hover { color: var(--gold); }
.mobile-close {
  position: absolute;
  top: 1.4rem;
  right: 1.4rem;
  background: none;
  border: 0;
  font-size: 2rem;
  cursor: pointer;
  color: var(--navy);
  line-height: 1;
}

/* ─── Contact form (Web3Forms) ───────────────────────────────── */
.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem 1.6rem;
  text-align: left;
  margin-top: 2.6rem;
}
.contact-form .field { display: flex; flex-direction: column; gap: 0.5rem; }
.contact-form .field.full { grid-column: 1 / -1; }
.contact-form label {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--slate);
}
.contact-form label .req { color: var(--gold); }
.contact-form input,
.contact-form textarea {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--navy);
  background: #FFFFFF;
  border: 1px solid var(--mist);
  padding: 0.85rem 1rem;
  width: 100%;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-faint);
}
.contact-form textarea { resize: vertical; min-height: 130px; }
.contact-form .honeypot { position: absolute; left: -9999px; opacity: 0; }
.contact-form .form-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}
.form-status {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--slate);
}
.form-status.success { color: var(--navy); font-weight: 500; }
.form-status.error { color: #9A3B2E; }
button.btn { font-family: var(--font-sans); }
@media (max-width: 600px) {
  .contact-form { grid-template-columns: 1fr; }
}

/* ─── Language switcher ─────────────────────────────────────── */
.nav-lang {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.nav-lang a {
  color: var(--slate);
  padding: 0.3rem 0;
  transition: color 0.25s ease;
}
.nav-lang a:hover { color: var(--navy); }
.nav-lang a.active { color: var(--gold-deep); font-weight: 600; }
.nav-lang .sep { color: var(--line-gold); user-select: none; }
@media (max-width: 960px) {
  .nav-lang { margin-left: auto; margin-right: 1.1rem; }
}