/* ==========================================================================
   Plaza Tech / Concourse Tech Inc. — NYC Urban Tech Design System
   ========================================================================== */

/* --- Custom Properties ------------------------------------------------ */
:root {
  /* Palette */
  --color-steel:   #2C3E6B;
  --color-steel-soft: #3A4F80;
  --color-graphite: #2D2D3A;
  --color-graphite-soft: #3E3E4D;
  --color-gold:    #A2893D;
  --color-gold-light: #C4A44E;
  --color-white:   #FAFBFC;
  --color-light:   #E4E7EB;
  --color-lime:    #7AB648;
  --color-lime-deep: #5F8E35;

  /* Typography */
  --font-sans: 'Inter', 'SF Pro Display', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;
  --fs-hero: clamp(2.75rem, 6vw, 5rem);
  --fs-h1:   clamp(2rem, 4vw, 3.25rem);
  --fs-h2:   clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3:   1.375rem;
  --fs-body: 1rem;
  --fs-sm:   0.875rem;
  --fs-xs:   0.75rem;

  /* Spacing — urban grid */
  --space-unit: 0.25rem;
  --gap-skinny: 0.5rem;
  --gap-narrow: 1rem;
  --gap-block:  1.5rem;
  --gap-section: clamp(3rem, 7vw, 7rem);
  --max-width:  72rem;
}

/* --- Reset ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-graphite);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-steel); text-decoration-thickness: 1px; text-underline-offset: 3px; transition: color .2s; }
a:hover { color: var(--color-gold); }
ul, ol { list-style: none; }

/* Focus ring */
:focus-visible { outline: 2px solid var(--color-lime); outline-offset: 3px; }

/* --- Skip Link -------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-steel);
  color: var(--color-white);
  padding: .5rem 1rem;
  z-index: 10000;
  font-size: var(--fs-sm);
  border-radius: 0 0 4px 4px;
}
.skip-link:focus { top: 0; }

/* --- Utility ---------------------------------------------------------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.container {
  width: 100%; max-width: var(--max-width); margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

/* --- Navigation ------------------------------------------------------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: var(--color-graphite);
  border-bottom: 3px solid var(--color-gold);
  transition: background .3s, box-shadow .3s;
}
.site-nav.scrolled { background: hsla(240, 13%, 25%, 0.97); box-shadow: 0 2px 24px rgba(0,0,0,.25); }
.site-nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 4rem;
}
.nav-brand {
  display: flex; align-items: center; gap: .625rem;
  font-weight: 700; font-size: 1.125rem; color: var(--color-white); text-decoration: none;
  letter-spacing: -.01em;
}
.nav-brand svg { flex-shrink: 0; width: 1.75rem; height: 1.75rem; }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  color: var(--color-light); font-size: var(--fs-sm); font-weight: 500;
  text-decoration: none; letter-spacing: .02em; text-transform: uppercase;
  position: relative; padding-block: .25rem;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
  background: var(--color-lime); transition: width .25s cubic-bezier(.4,0,.2,1);
}
.nav-links a:hover::after, .nav-links a:focus-visible::after { width: 100%; }
.nav-links a:hover { color: var(--color-white); }
.nav-cta {
  background: var(--color-lime); color: var(--color-graphite) !important;
  padding: .45rem 1.25rem !important; border-radius: 4px; font-weight: 600 !important;
  transition: background .25s !important;
}
.nav-cta:hover { background: var(--color-lime-deep) !important; }
.nav-cta::after { display: none !important; }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 4px; z-index: 1001;
}
.hamburger span {
  display: block; width: 26px; height: 2.5px; background: var(--color-white);
  border-radius: 2px; transition: transform .3s, opacity .3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; inset: 0; background: var(--color-graphite);
    flex-direction: column; justify-content: center; gap: 2rem;
    opacity: 0; pointer-events: none; transition: opacity .35s;
  }
  .nav-links.open { opacity: 1; pointer-events: auto; }
  .nav-links a { font-size: 1.25rem; }
}

/* --- Hero — Skyscraper feel, tall asymmetric block ------------------- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: var(--color-graphite);
  position: relative; overflow: hidden;
  padding-block: 6rem 4rem;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    /* Vertical strips — skyline echoes */
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 14%,
      hsla(224, 30%, 55%, .06) 14%,
      hsla(224, 30%, 55%, .06) 15%
    );
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 6px;
  background: linear-gradient(90deg, var(--color-steel), var(--color-gold), var(--color-lime), var(--color-steel));
  z-index: 2;
}
.hero .container {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.25fr 1fr; gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-eyebrow {
  display: inline-block; padding: .3rem .85rem;
  background: var(--color-steel); color: var(--color-lime);
  font-size: var(--fs-xs); font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; border-radius: 3px;
  margin-block-end: 1.25rem;
}
.hero h1 {
  font-size: var(--fs-hero); line-height: 1.05; letter-spacing: -.02em;
  color: var(--color-white); font-weight: 800;
  margin-block-end: .75rem;
}
.hero h1 em {
  font-style: normal; color: var(--color-lime);
  display: block;
}
.hero-lead {
  font-size: 1.125rem; color: var(--color-light); max-width: 36ch;
  line-height: 1.55; margin-block-end: 2rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .75rem 1.75rem; font-size: var(--fs-sm); font-weight: 600;
  border-radius: 5px; text-decoration: none; cursor: pointer;
  transition: background .25s, transform .2s, box-shadow .25s;
  border: none; font-family: inherit; letter-spacing: .01em;
}
.btn:active { transform: scale(.98); }
.btn-primary {
  background: var(--color-lime); color: var(--color-graphite);
  box-shadow: 0 4px 14px rgba(122, 182, 72, .35);
}
.btn-primary:hover { background: var(--color-lime-deep); color: var(--color-graphite); }
.btn-outline {
  background: transparent; color: var(--color-white);
  border: 2px solid var(--color-steel-soft);
}
.btn-outline:hover { border-color: var(--color-gold); color: var(--color-gold); }
/* Hero visual block */
.hero-visual {
  position: relative; display: grid;
  grid-template-columns: repeat(3, 1fr); gap: .75rem;
  height: clamp(280px, 40vw, 420px);
}
.hero-visual .tower {
  border-radius: 6px 6px 0 0; align-self: end;
  transition: transform .4s cubic-bezier(.4,0,.2,1);
}
.hero-visual .tower:nth-child(1) { height: 65%; background: var(--color-steel); }
.hero-visual .tower:nth-child(2) { height: 85%; background: var(--color-steel-soft); }
.hero-visual .tower:nth-child(3) { height: 50%; background: var(--color-steel); }
.hero-visual .tower:nth-child(4) { height: 78%; background: var(--color-gold); }
.hero-visual .tower:nth-child(5) { height: 92%; background: var(--color-graphite-soft); border-left: 3px solid var(--color-lime); }
.hero-visual .tower:nth-child(6) { height: 58%; background: var(--color-steel-soft); }
.hero-visual .tower:hover { transform: translateY(-6px); }

@media (max-width: 768px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { height: 160px; grid-template-columns: repeat(6, 1fr); gap: .4rem; }
}

/* --- Section Headers ------------------------------------------------- */
.section-head {
  text-align: center; margin-block-end: 3.5rem;
}
.section-head .eyebrow {
  display: inline-block; font-size: var(--fs-xs); font-weight: 700;
  color: var(--color-gold); text-transform: uppercase; letter-spacing: .14em;
  margin-block-end: .5rem;
}
.section-head h2 {
  font-size: var(--fs-h2); font-weight: 750; letter-spacing: -.02em;
  color: var(--color-graphite); line-height: 1.15;
}
.section-head p {
  margin-top: .75rem; max-width: 52ch; margin-inline: auto;
  color: var(--color-graphite-soft); font-size: 1.0625rem;
}

/* --- Urban Card Grid — tall narrow cards, staggered ------------------ */
.urban-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-block);
  align-items: start;
}
@media (max-width: 900px) { .urban-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .urban-grid { grid-template-columns: 1fr; } }

.urban-card {
  background: var(--color-white);
  border: 1px solid var(--color-light);
  border-radius: 8px;
  padding: 2rem 1.5rem;
  display: flex; flex-direction: column; gap: 1rem;
  transition: transform .35s cubic-bezier(.4,0,.2,1), box-shadow .35s;
  position: relative; overflow: hidden;
}
.urban-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--color-steel);
}
.urban-card:nth-child(3n+1)::before { background: var(--color-steel); }
.urban-card:nth-child(3n+2)::before { background: var(--color-gold); }
.urban-card:nth-child(3n+3)::before { background: var(--color-lime); }
.urban-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 36px rgba(45,45,58,.1);
}
/* Stagger heights for skyline effect */
.urban-card:nth-child(odd) { min-height: 280px; }
.urban-card:nth-child(even) { min-height: 340px; margin-top: -1.5rem; }
@media (max-width: 900px) {
  .urban-card:nth-child(even) { margin-top: 0; min-height: 280px; }
}

.urban-card-icon {
  width: 3rem; height: 3rem; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-light); flex-shrink: 0;
}
.urban-card-icon svg { width: 1.5rem; height: 1.5rem; }
.urban-card h3 { font-size: var(--fs-h3); font-weight: 650; color: var(--color-graphite); letter-spacing: -.01em; }
.urban-card p { color: var(--color-graphite-soft); font-size: .9375rem; line-height: 1.6; }

/* --- Services Section ------------------------------------------------ */
.services-section { padding-block: var(--gap-section); background: var(--color-white); }

/* --- Stats Bar — horizontal stack, clean data rows ------------------- */
.stats-section {
  background: var(--color-steel); color: var(--color-white);
  padding-block: 3rem;
}
.stats-row {
  display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-around;
  text-align: center;
}
.stat-item { flex: 1; min-width: 140px; }
.stat-number {
  font-size: clamp(2.25rem, 5vw, 3.5rem); font-weight: 800;
  letter-spacing: -.02em; color: var(--color-lime); line-height: 1;
}
.stat-label {
  font-size: var(--fs-sm); font-weight: 500; color: var(--color-light);
  margin-top: .4rem; text-transform: uppercase; letter-spacing: .06em;
}

/* --- Approach — tall staggered process blocks ------------------------ */
.approach-section {
  padding-block: var(--gap-section);
  background: var(--color-light);
}
.process-stack {
  display: flex; flex-direction: column; gap: 0;
  max-width: 48rem; margin-inline: auto;
}
.process-step {
  display: grid; grid-template-columns: 5rem 1fr; gap: 1.5rem;
  padding: 1.75rem 0; border-bottom: 1px solid hsla(0,0%,0%,.08);
  align-items: start;
}
.process-step:last-child { border-bottom: none; }
.process-num {
  font-size: 2.5rem; font-weight: 800; color: var(--color-gold);
  line-height: 1; font-variant-numeric: tabular-nums;
}
.process-step h3 { font-size: 1.125rem; font-weight: 650; color: var(--color-graphite); }
.process-step p { color: var(--color-graphite-soft); font-size: .9375rem; margin-top: .35rem; }

@media (max-width: 520px) {
  .process-step { grid-template-columns: 3rem 1fr; gap: 1rem; }
  .process-num { font-size: 1.75rem; }
}

/* --- Vertical highlight strip ---------------------------------------- */
.feature-strip {
  padding-block: var(--gap-section);
  background: var(--color-white);
}
.split-block {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.split-block.reverse { direction: rtl; }
.split-block.reverse > * { direction: ltr; }
.split-block h2 {
  font-size: var(--fs-h2); font-weight: 750; letter-spacing: -.02em;
  color: var(--color-graphite); margin-block-end: 1rem;
}
.split-block p {
  color: var(--color-graphite-soft); font-size: 1rem; line-height: 1.65;
  margin-block-end: 1.5rem;
}
.split-visual {
  background: var(--color-graphite); border-radius: 10px;
  min-height: 280px;
  display: flex; align-items: flex-end; gap: .5rem;
  padding: 1rem; justify-content: center; overflow: hidden;
}
.split-visual .bar {
  width: 2.5rem; border-radius: 4px 4px 0 0;
  transition: height .6s cubic-bezier(.4,0,.2,1);
}
.split-visual .bar:nth-child(1) { height: 40%; background: var(--color-steel); }
.split-visual .bar:nth-child(2) { height: 65%; background: var(--color-steel-soft); }
.split-visual .bar:nth-child(3) { height: 88%; background: var(--color-gold); }
.split-visual .bar:nth-child(4) { height: 55%; background: var(--color-lime); }
.split-visual .bar:nth-child(5) { height: 72%; background: var(--color-steel); }
.split-visual .bar:nth-child(6) { height: 46%; background: var(--color-steel-soft); }

@media (max-width: 768px) {
  .split-block { grid-template-columns: 1fr; }
  .split-visual { min-height: 160px; }
}

/* --- CTA Section ----------------------------------------------------- */
.cta-section {
  padding-block: var(--gap-section);
  background: var(--color-graphite); text-align: center; position: relative;
}
.cta-section::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--color-steel), var(--color-gold), var(--color-lime));
}
.cta-section h2 { color: var(--color-white); font-size: var(--fs-h2); font-weight: 750; }
.cta-section p { color: var(--color-light); font-size: 1.0625rem; margin-block: 1rem 2rem; max-width: 48ch; margin-inline: auto; }
.cta-section .btn { font-size: 1rem; padding: .85rem 2.25rem; }

/* --- Contact --------------------------------------------------------- */
.contact-section {
  padding-block: var(--gap-section); background: var(--color-white);
}
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: clamp(2rem, 5vw, 4rem);
  max-width: 56rem; margin-inline: auto;
}
.contact-info h2 { font-size: var(--fs-h2); font-weight: 750; color: var(--color-graphite); margin-block-end: .75rem; }
.contact-info > p { color: var(--color-graphite-soft); margin-block-end: 1.5rem; line-height: 1.6; }
.contact-meta { display: flex; flex-direction: column; gap: .75rem; }
.contact-meta li { display: flex; align-items: center; gap: .6rem; color: var(--color-graphite); font-size: .9375rem; }
.contact-meta li svg { flex-shrink: 0; width: 1.1rem; height: 1.1rem; color: var(--color-steel); }

.contact-form { display: flex; flex-direction: column; gap: 1rem; }
.contact-form label { display: flex; flex-direction: column; gap: .3rem; font-size: var(--fs-sm); font-weight: 550; color: var(--color-graphite); }
.contact-form input,
.contact-form textarea {
  padding: .7rem .9rem; border: 2px solid var(--color-light);
  border-radius: 6px; font: inherit; font-size: .9375rem; color: var(--color-graphite);
  background: var(--color-white); transition: border-color .25s;
  resize: vertical;
}
.contact-form input:focus,
.contact-form textarea:focus { border-color: var(--color-steel); outline: none; }
.contact-form button { align-self: flex-start; }
.contact-form .form-msg { font-size: var(--fs-sm); min-height: 1.25rem; }
.contact-form .form-msg.success { color: var(--color-lime-deep); }
.contact-form .form-msg.error { color: #c0392b; }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* --- Footer ----------------------------------------------------------- */
.site-footer {
  background: var(--color-graphite); color: var(--color-light);
  padding-block: 3rem 1.75rem; font-size: .875rem;
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2rem; padding-block-end: 2rem;
  border-bottom: 1px solid hsla(0,0%,100%,.08);
}
.footer-brand h3 { color: var(--color-white); font-size: 1.125rem; margin-block-end: .5rem; font-weight: 650; }
.footer-brand p { color: var(--color-light); line-height: 1.55; }
.footer-col h4 {
  color: var(--color-white); font-size: var(--fs-xs); text-transform: uppercase;
  letter-spacing: .08em; margin-block-end: .85rem; font-weight: 600;
}
.footer-col li { margin-block-end: .45rem; }
.footer-col a { color: var(--color-light); text-decoration: none; font-size: .875rem; }
.footer-col a:hover { color: var(--color-lime); }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem;
  padding-block-start: 1.5rem; font-size: var(--fs-xs); color: var(--color-light);
}
.footer-bottom a { color: var(--color-light); text-decoration: none; }
.footer-bottom a:hover { color: var(--color-lime); }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* --- Policy / Legal Pages -------------------------------------------- */
.legal-hero {
  background: var(--color-graphite); padding-block: 7rem 3.5rem;
  text-align: center; position: relative;
}
.legal-hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--color-steel), var(--color-gold), var(--color-lime));
}
.legal-hero h1 { color: var(--color-white); font-size: var(--fs-h1); font-weight: 800; letter-spacing: -.02em; }
.legal-hero p { color: var(--color-light); margin-top: .5rem; }
.legal-body {
  max-width: 48rem; margin-inline: auto; padding-block: 3rem 5rem;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}
.legal-body section { margin-block-end: 2.5rem; }
.legal-body h2 { font-size: 1.375rem; font-weight: 650; color: var(--color-graphite); margin-block-end: .75rem; }
.legal-body h3 { font-size: 1.125rem; font-weight: 600; color: var(--color-graphite-soft); margin-block: 1.25rem .5rem; }
.legal-body p, .legal-body li { font-size: 1rem; line-height: 1.7; color: var(--color-graphite-soft); margin-block-end: .75rem; }
.legal-body ul { list-style: disc; padding-inline-start: 1.5rem; margin-block-end: 1rem; }
.legal-body li { margin-block-end: .35rem; }
.legal-body .last-updated {
  font-size: var(--fs-sm); color: var(--color-graphite-soft);
  font-style: italic; margin-block: .5rem 2rem;
}

/* --- Scroll Animations ----------------------------------------------- */
.fade-up {
  opacity: 0; transform: translateY(2rem);
  transition: opacity .65s cubic-bezier(.4,0,.2,1), transform .65s cubic-bezier(.4,0,.2,1);
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-in { opacity: 0; transition: opacity .8s; }
.fade-in.visible { opacity: 1; }

/* --- Counter animation (no-op in CSS, driven by JS) ------------------ */