/* ============================================================
   Zhu Mei — GARELOCH AVE CORP
   Computer Systems Design — Professional Single-Page
   STRONG CONTRAST. NO rgba() text. Mobile-first.
   ============================================================ */

/* --- RESET & ROOT ----------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* palette — high contrast, no washed-out pastels */
  --c-black:   #0a0a0b;
  --c-ink:     #111115;
  --c-charcoal:#1e1e24;
  --c-slate:   #2c2c34;
  --c-steel:   #3e3e48;
  --c-mist:    #6b6b78;
  --c-silver:  #a0a0ac;
  --c-ice:     #d4d4dc;
  --c-snow:    #f0f0f4;
  --c-white:   #fafafc;
  --c-accent:  #c74b16;   /* deep burnt orange */
  --c-accent-bright: #e85d20;
  --c-link:    #b33f10;
  --c-success: #1b7a3d;
  --c-warn:    #c78800;
  --c-error:   #c02020;

  /* typography */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --fs-xs:  0.75rem;    /* 12px */
  --fs-sm:  0.875rem;   /* 14px */
  --fs-base: 1rem;      /* 16px */
  --fs-md:  1.125rem;   /* 18px */
  --fs-lg:  1.25rem;    /* 20px */
  --fs-xl:  1.5rem;     /* 24px */
  --fs-2xl: 2rem;       /* 32px */
  --fs-3xl: 2.5rem;     /* 40px */
  --fs-4xl: 3rem;       /* 48px */
  --fs-5xl: 3.75rem;    /* 60px */

  --lh-tight: 1.15;
  --lh-base:  1.6;
  --lh-relax: 1.75;

  /* spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* layout */
  --max-w: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px #00000030;
  --shadow-md: 0 4px 16px #00000030;
  --shadow-lg: 0 8px 32px #00000040;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--c-ink);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- UTILITY ---------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.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;
}

/* --- SKIP LINK ------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--c-accent);
  color: var(--c-white);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  z-index: 10000;
  font-weight: 700;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-md); }

/* --- HEADER / NAV ---------------------------------------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-ice);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--c-ink);
  font-weight: 800;
  font-size: var(--fs-lg);
  letter-spacing: -0.02em;
}
.logo-icon {
  width: 36px; height: 36px;
  background: var(--c-accent);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: var(--fs-lg);
  font-weight: 900;
  flex-shrink: 0;
}
.logo-accent { color: var(--c-accent); }

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-xs);
}
.nav-list a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  color: var(--c-slate);
  font-weight: 500;
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--c-accent);
  background: #c74b1610;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--c-ink);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- HERO ------------------------------------------------ */
.hero {
  padding: 120px 0 var(--space-4xl);
  background: var(--c-ink);
  color: var(--c-white);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 50%, #c74b1630 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 80% 30%, #e85d2018 0%, transparent 70%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: #c74b1625;
  color: var(--c-accent-bright);
  border: 1px solid #c74b1635;
  padding: var(--space-xs) var(--space-md);
  border-radius: 99px;
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: var(--fs-5xl);
  font-weight: 900;
  line-height: var(--lh-tight);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  color: var(--c-white);
}
.hero-title span { color: var(--c-accent-bright); }

.hero-subtitle {
  font-size: var(--fs-lg);
  color: var(--c-silver);
  line-height: var(--lh-relax);
  margin-bottom: var(--space-xl);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: var(--fs-sm);
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  line-height: 1;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--c-accent);
  color: var(--c-white);
  border-color: var(--c-accent);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--c-accent-bright);
  border-color: var(--c-accent-bright);
}

.btn-outline {
  background: transparent;
  color: var(--c-white);
  border-color: var(--c-steel);
}
.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--c-white);
  color: var(--c-ink);
  border-color: var(--c-white);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-illustration {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1 / 1;
  background: var(--c-charcoal);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-steel);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.hero-illustration svg { width: 64%; height: auto; }

/* floating stat cards */
.hero-stat {
  position: absolute;
  background: var(--c-charcoal);
  border: 1px solid var(--c-steel);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  text-align: center;
}
.hero-stat-num {
  font-size: var(--fs-2xl);
  font-weight: 900;
  color: var(--c-accent-bright);
  line-height: 1;
}
.hero-stat-label {
  font-size: var(--fs-xs);
  color: var(--c-silver);
  margin-top: var(--space-xs);
}
.hero-stat:nth-child(1) { top: 8%;  right: -5%; }
.hero-stat:nth-child(2) { bottom: 10%; left: -5%; }
.hero-stat:nth-child(3) { bottom: 22%; right: -8%; }

/* --- SECTION COMMON -------------------------------------- */
.section {
  padding: var(--space-4xl) 0;
}
.section-alt { background: var(--c-snow); }

.section-label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: var(--fs-3xl);
  font-weight: 900;
  color: var(--c-ink);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: var(--fs-md);
  color: var(--c-mist);
  max-width: 640px;
  line-height: var(--lh-relax);
  margin-bottom: var(--space-2xl);
}

/* --- SERVICES -------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.service-card {
  background: var(--c-white);
  border: 1px solid var(--c-ice);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.service-card:hover {
  border-color: var(--c-steel);
  box-shadow: var(--shadow-md);
}

.service-icon {
  width: 48px; height: 48px;
  background: var(--c-snow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--c-accent);
}
.service-icon svg { width: 24px; height: 24px; }

.service-card h3 {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--space-sm);
}
.service-card p {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  line-height: var(--lh-relax);
}

/* --- ABOUT ----------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-visual {
  background: var(--c-ink);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.about-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, #c74b1618 0%, transparent 70%);
}
.about-visual svg { width: 50%; height: auto; position: relative; z-index: 1; }

.about-text .section-title { margin-bottom: var(--space-lg); }
.about-text p {
  font-size: var(--fs-base);
  color: var(--c-mist);
  line-height: var(--lh-relax);
  margin-bottom: var(--space-md);
}
.about-text p:last-child { margin-bottom: 0; }

.about-badges {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-xl);
  flex-wrap: wrap;
}
.about-badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--c-snow);
  border: 1px solid var(--c-ice);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--c-slate);
}

/* --- PROCESS --------------------------------------------- */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  counter-reset: step;
  position: relative;
}
.process-steps::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background: var(--c-ice);
  z-index: 0;
}

.process-step {
  position: relative;
  z-index: 1;
  text-align: center;
}
.process-step-num {
  width: 48px; height: 48px;
  background: var(--c-accent);
  color: var(--c-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: var(--fs-lg);
  margin: 0 auto var(--space-md);
}
.process-step h3 {
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--space-xs);
}
.process-step p {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  line-height: var(--lh-relax);
}

/* --- INDUSTRIES ------------------------------------------ */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.industry-card {
  background: var(--c-white);
  border: 1px solid var(--c-ice);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  transition: border-color 0.2s ease;
}
.industry-card:hover { border-color: var(--c-accent); }

.industry-icon {
  width: 40px; height: 40px;
  margin: 0 auto var(--space-md);
  color: var(--c-accent);
}
.industry-card h3 {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-ink);
}

/* --- STATS ----------------------------------------------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}

.stat-item {}
.stat-number {
  font-size: var(--fs-4xl);
  font-weight: 900;
  color: var(--c-accent);
  line-height: 1;
}
.stat-label {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  margin-top: var(--space-sm);
}

/* --- CTA ------------------------------------------------- */
.cta-section {
  background: var(--c-accent);
  color: var(--c-white);
  padding: var(--space-4xl) 0;
  text-align: center;
}
.cta-section .section-title { color: var(--c-white); }
.cta-section .section-desc { color: #ffffffcc; margin-left: auto; margin-right: auto; }
.cta-section .btn-primary {
  background: var(--c-white);
  color: var(--c-accent);
  border-color: var(--c-white);
}
.cta-section .btn-primary:hover,
.cta-section .btn-primary:focus-visible {
  background: var(--c-ink);
  color: var(--c-white);
  border-color: var(--c-ink);
}
.cta-section .btn-outline {
  border-color: #ffffff55;
  color: var(--c-white);
}
.cta-section .btn-outline:hover,
.cta-section .btn-outline:focus-visible {
  background: var(--c-white);
  color: var(--c-accent);
  border-color: var(--c-white);
}

/* --- CONTACT --------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-3xl);
}

.contact-info h3 {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: var(--space-md);
}
.contact-info > p {
  font-size: var(--fs-base);
  color: var(--c-mist);
  line-height: var(--lh-relax);
  margin-bottom: var(--space-xl);
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.contact-detail-icon {
  width: 40px; height: 40px;
  background: var(--c-snow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--c-accent);
}
.contact-detail h4 {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 2px;
}
.contact-detail p,
.contact-detail a {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  text-decoration: none;
}
.contact-detail a:hover { color: var(--c-accent); }

.contact-form {
  background: var(--c-white);
  border: 1px solid var(--c-ice);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}
.form-group { margin-bottom: var(--space-md); }
.form-group label {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--c-slate);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.875rem;
  font-size: var(--fs-sm);
  font-family: var(--font-sans);
  border: 1px solid var(--c-ice);
  border-radius: var(--radius-sm);
  background: var(--c-white);
  color: var(--c-ink);
  transition: border-color 0.15s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px #c74b1620;
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* --- FOOTER ---------------------------------------------- */
.site-footer {
  background: var(--c-ink);
  color: var(--c-silver);
  padding: var(--space-3xl) 0 var(--space-lg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
.footer-brand .logo { color: var(--c-white); margin-bottom: var(--space-md); }
.footer-brand p {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  line-height: var(--lh-relax);
}
.footer-col h4 {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--c-white);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: var(--space-sm); }
.footer-col a {
  font-size: var(--fs-sm);
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--c-accent-bright); }

.footer-bottom {
  border-top: 1px solid var(--c-charcoal);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--fs-xs);
  color: var(--c-steel);
}
.footer-bottom a {
  color: var(--c-mist);
  text-decoration: none;
}
.footer-bottom a:hover { color: var(--c-accent-bright); }

.legal-links { display: flex; gap: var(--space-lg); }

/* --- MOBILE NAV DRAWER ----------------------------------- */
@media (max-width: 860px) {
  .nav-list {
    position: fixed;
    top: 64px; left: 0; right: 0; bottom: 0;
    background: var(--c-white);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 999;
  }
  .nav-list.open { transform: translateX(0); }
  .nav-list a { font-size: var(--fs-lg); padding: var(--space-md) var(--space-xl); }
  .nav-toggle { display: flex; }
}

/* --- RESPONSIVE BREAKPOINTS ------------------------------ */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { display: none; }
  .hero { padding: 100px 0 var(--space-3xl); }
  .hero-title { font-size: var(--fs-3xl); }

  .services-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .about-visual { max-width: 480px; margin: 0 auto; }
  .process-steps { grid-template-columns: 1fr 1fr; }
  .process-steps::before { display: none; }
  .industries-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  :root {
    --fs-5xl: 2.25rem;
    --fs-3xl: 1.75rem;
    --fs-4xl: 2rem;
  }
  .container { padding: 0 var(--space-md); }
  .section { padding: var(--space-3xl) 0; }
  .services-grid { grid-template-columns: 1fr; }
  .process-steps { grid-template-columns: 1fr; }
  .industries-grid { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-stat { display: none; }
}

@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;
  }
}

/* --- PRINT ----------------------------------------------- */
@media print {
  .site-header, .nav-toggle, .hero-stat, .cta-section, .contact-form { display: none; }
  body { color: #000; background: #fff; }
  a { color: #000; }
}