/* ============================================================
   DangYang Computer Systems Design — Complete Stylesheet
   Industry: Computer Systems Design and Related Services
   All colors are solid hex. No translucent/rgba text.
   Body font minimum 16px.
   ============================================================ */

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

:root {
  --clr-navy:      #0b1a2e;
  --clr-charcoal:  #1a2332;
  --clr-slate:     #2c3a4b;
  --clr-blue:      #1e6ff7;
  --clr-blue-dark: #1557cc;
  --clr-teal:      #009688;
  --clr-teal-dark: #00796b;
  --clr-amber:     #f59e0b;
  --clr-amber-dark:#d97706;
  --clr-red:       #dc2626;
  --clr-white:     #ffffff;
  --clr-snow:      #f8f9fb;
  --clr-smoke:     #e8ecf1;
  --clr-ash:       #b0b8c1;
  --clr-slate-txt: #4a5568;
  --clr-dark-txt:  #1e293b;

  --font-body:   'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --gap: 1.5rem;
  --maxw: 1240px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-dark-txt);
  background: var(--clr-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: var(--clr-blue); text-decoration: none; }
a:hover { color: var(--clr-blue-dark); }

h1, h2, h3, h4, h5, h6 {
  color: var(--clr-navy);
  line-height: 1.25;
  font-weight: 700;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* --- Top Navigation --------------------------------------- */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--clr-navy);
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 68px;
}

.nav-brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-white);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-brand .brand-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--clr-amber);
  transform: rotate(45deg);
  border-radius: 2px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--clr-ash);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--clr-teal);
  transition: width 0.25s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-white);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: all 0.3s;
}

/* --- Hero Section (Homepage) ------------------------------ */
.hero-section {
  background: var(--clr-navy);
  color: var(--clr-white);
  padding: 100px 0 120px;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: var(--clr-charcoal);
  transform: rotate(35deg);
  border-radius: 80px;
  opacity: 0.6;
  z-index: 0;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 600px;
  height: 600px;
  border: 3px solid var(--clr-blue);
  transform: rotate(25deg);
  border-radius: 60px;
  opacity: 0.25;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-badge {
  display: inline-block;
  background: var(--clr-teal);
  color: var(--clr-white);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 16px;
  border-radius: 4px;
  margin-bottom: 1.5rem;
}

.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--clr-white);
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.hero-content h1 .highlight {
  color: var(--clr-amber);
}

.hero-content p.hero-desc {
  font-size: 1.15rem;
  color: var(--clr-ash);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  text-align: center;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.25s;
}

.btn-primary {
  background: var(--clr-blue);
  color: var(--clr-white);
}

.btn-primary:hover {
  background: var(--clr-blue-dark);
  color: var(--clr-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--clr-white);
  border: 2px solid var(--clr-slate);
}

.btn-outline:hover {
  border-color: var(--clr-teal);
  color: var(--clr-teal);
}

.btn-teal {
  background: var(--clr-teal);
  color: var(--clr-white);
}

.btn-teal:hover {
  background: var(--clr-teal-dark);
  color: var(--clr-white);
}

.hero-canvas {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  z-index: 0;
  opacity: 0.7;
}

/* --- Section Common --------------------------------------- */
.section {
  padding: 90px 0;
}

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--clr-blue);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--clr-navy);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--clr-slate-txt);
  max-width: 600px;
  margin-bottom: 3rem;
}

.section-alt {
  background: var(--clr-snow);
}

/* --- Services Grid (Homepage) ----------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.service-card {
  background: var(--clr-white);
  border: 1px solid var(--clr-smoke);
  padding: 2.5rem 2rem;
  border-radius: 10px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--clr-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.service-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: transparent;
  transform: translateY(-4px);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-snow);
  border-radius: 12px;
  margin-bottom: 1.5rem;
  font-size: 1.6rem;
}

.service-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
  color: var(--clr-navy);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--clr-slate-txt);
  line-height: 1.65;
}

/* --- Metrics Strip ---------------------------------------- */
.metrics-strip {
  background: var(--clr-charcoal);
  padding: 60px 0;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.metric-item .metric-value {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--clr-amber);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-item .metric-label {
  font-size: 0.95rem;
  color: var(--clr-ash);
  font-weight: 500;
}

/* --- About Section ---------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-visual {
  position: relative;
  height: 420px;
  background: var(--clr-navy);
  border-radius: 16px;
  overflow: hidden;
}

.about-visual-inner {
  position: absolute;
  inset: 30px;
  border: 2px solid var(--clr-teal);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual-inner .about-icon-large {
  font-size: 5rem;
  color: var(--clr-teal);
  opacity: 0.8;
}

.about-visual .corner-accent {
  position: absolute;
  width: 60px;
  height: 60px;
  border: 3px solid var(--clr-blue);
}

.about-visual .corner-tl { top: 15px; left: 15px; border-right: none; border-bottom: none; }
.about-visual .corner-br { bottom: 15px; right: 15px; border-left: none; border-top: none; }

.about-text h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--clr-navy);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--clr-slate-txt);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.about-list {
  list-style: none;
  margin-top: 1.5rem;
}

.about-list li {
  padding: 0.5rem 0;
  padding-left: 2rem;
  position: relative;
  font-size: 1rem;
  color: var(--clr-dark-txt);
}

.about-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 12px;
  height: 12px;
  background: var(--clr-teal);
  transform: rotate(45deg);
  border-radius: 2px;
}

/* --- Process Section -------------------------------------- */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.process-timeline::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 12.5%;
  right: 12.5%;
  height: 3px;
  background: var(--clr-smoke);
  z-index: 0;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
  padding: 0 1rem;
}

.process-step .step-number {
  width: 48px;
  height: 48px;
  background: var(--clr-blue);
  color: var(--clr-white);
  font-weight: 800;
  font-size: 1.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  position: relative;
  z-index: 2;
}

.process-step h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--clr-navy);
}

.process-step p {
  font-size: 0.9rem;
  color: var(--clr-slate-txt);
  line-height: 1.6;
}

/* --- Industries Section ----------------------------------- */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.industry-card {
  text-align: center;
  padding: 2rem 1.25rem;
  border: 1px solid var(--clr-smoke);
  border-radius: 10px;
  background: var(--clr-white);
  transition: all 0.25s;
}

.industry-card:hover {
  border-color: var(--clr-blue);
  box-shadow: var(--shadow-md);
}

.industry-card .ind-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.industry-card h4 {
  font-size: 1rem;
  color: var(--clr-navy);
}

/* --- CTA Banner ------------------------------------------- */
.cta-banner {
  background: var(--clr-blue);
  padding: 70px 0;
  text-align: center;
}

.cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--clr-white);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.cta-banner p {
  font-size: 1.1rem;
  color: var(--clr-smoke);
  margin-bottom: 2rem;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.btn-cta {
  background: var(--clr-white);
  color: var(--clr-blue);
  font-weight: 700;
}

.btn-cta:hover {
  background: var(--clr-snow);
  color: var(--clr-blue-dark);
  transform: translateY(-2px);
}

/* --- Contact Section (Homepage) --------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-card {
  background: var(--clr-white);
  border: 1px solid var(--clr-smoke);
  border-radius: 10px;
  padding: 2rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: all 0.25s;
}

.contact-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--clr-blue);
}

.contact-card .cc-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-snow);
  border-radius: 10px;
}

.contact-card h4 {
  font-size: 0.95rem;
  color: var(--clr-navy);
  margin-bottom: 0.3rem;
}

.contact-card p, .contact-card a {
  font-size: 0.95rem;
  color: var(--clr-slate-txt);
}

.contact-map-placeholder {
  background: var(--clr-navy);
  border-radius: 12px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-ash);
  font-size: 1rem;
  position: relative;
  overflow: hidden;
}

.contact-map-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 39px,
    var(--clr-slate) 39px,
    var(--clr-slate) 40px
  ),
  repeating-linear-gradient(
    90deg,
    transparent,
    transparent 39px,
    var(--clr-slate) 39px,
    var(--clr-slate) 40px
  );
  opacity: 0.15;
}

/* --- Footer ----------------------------------------------- */
.site-footer {
  background: var(--clr-navy);
  color: var(--clr-ash);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--clr-white);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--clr-ash);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col ul li a {
  font-size: 0.9rem;
  color: var(--clr-ash);
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: var(--clr-teal);
}

.footer-bottom {
  border-top: 1px solid var(--clr-slate);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--clr-ash);
}

/* ============================================================
   Privacy & Terms Policy Pages
   ============================================================ */

.page-header-legal {
  background: var(--clr-navy);
  padding: 70px 0;
  text-align: center;
}

.page-header-legal h1 {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--clr-white);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-header-legal p {
  font-size: 1.05rem;
  color: var(--clr-ash);
}

.legal-body {
  padding: 70px 0;
  background: var(--clr-white);
}

.legal-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  align-items: start;
}

/* Sidebar navigation */
.legal-sidebar {
  position: sticky;
  top: 90px;
  background: var(--clr-snow);
  border: 1px solid var(--clr-smoke);
  border-radius: 10px;
  padding: 1.75rem;
}

.legal-sidebar h3 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-navy);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--clr-smoke);
}

.legal-sidebar ul {
  list-style: none;
}

.legal-sidebar ul li {
  margin-bottom: 0.3rem;
}

.legal-sidebar ul li a {
  display: block;
  font-size: 0.9rem;
  color: var(--clr-slate-txt);
  padding: 6px 10px;
  border-radius: 5px;
  transition: all 0.2s;
}

.legal-sidebar ul li a:hover,
.legal-sidebar ul li a.active {
  background: var(--clr-blue);
  color: var(--clr-white);
}

/* Main content */
.legal-content h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--clr-navy);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--clr-smoke);
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--clr-navy);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.legal-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--clr-slate-txt);
  margin-bottom: 1rem;
}

.legal-content ul,
.legal-content ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}

.legal-content ul li,
.legal-content ol li {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--clr-slate-txt);
  margin-bottom: 0.4rem;
}

.legal-content strong {
  color: var(--clr-navy);
}

.legal-content .info-box {
  background: var(--clr-snow);
  border-left: 4px solid var(--clr-blue);
  padding: 1.25rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}

.legal-content .info-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* ============================================================
   Responsive Design
   ============================================================ */

@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .industries-grid { grid-template-columns: repeat(2, 1fr); }
  .process-timeline { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
  .process-timeline::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .legal-layout { grid-template-columns: 1fr; }
  .legal-sidebar { position: static; margin-bottom: 1.5rem; }
  .legal-sidebar ul { display: flex; flex-wrap: wrap; gap: 0.5rem; }
  .legal-sidebar ul li { margin-bottom: 0; }
  .hero-content h1 { font-size: 2.4rem; }
  .section-title { font-size: 1.8rem; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--clr-navy);
    padding: 1rem var(--gap);
    gap: 0.75rem;
    border-top: 1px solid var(--clr-slate);
  }
  .hero-section { padding: 60px 0 70px; }
  .hero-content h1 { font-size: 2rem; }
  .hero-canvas { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .industries-grid { grid-template-columns: 1fr 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-visual { height: 280px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .page-header-legal h1 { font-size: 1.9rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.7rem; }
  .section { padding: 50px 0; }
  .metric-value { font-size: 2rem; }
}