/* ============================================================
   Bloom Fall — Computer Systems Design
   Jingmen Zhandui Network Technology Co., Ltd.
   ============================================================ */

/* --- Custom Properties ----------------------------------- */
:root {
  /* Palette — warm autumn + cool slate */
  --color-amber:        #d4892a;
  --color-amber-deep:   #a0651c;
  --color-ember:        #e05a2e;
  --color-slate-900:    #0f1724;
  --color-slate-800:    #1a2332;
  --color-slate-700:    #243044;
  --color-slate-600:    #334155;
  --color-slate-500:    #55667a;
  --color-slate-400:    #7b8ea3;
  --color-slate-300:    #a8b9cc;
  --color-slate-200:    #c8d3e0;
  --color-slate-100:    #e2e8f2;
  --color-slate-50:     #f0f4f9;
  --color-cream:        #fdfaf5;
  --color-white:        #ffffff;

  /* Surfaces */
  --bg-body:            var(--color-slate-900);
  --bg-card:            var(--color-slate-800);
  --bg-card-hover:      #1e2b3d;
  --bg-header:          #0b101c;

  /* Text */
  --text-primary:       #edf1f7;
  --text-secondary:     #a0b0c4;
  --text-muted:         #6a7d94;
  --text-accent:        var(--color-amber);

  /* Borders */
  --border-subtle:      #1e2e42;
  --border-card:        #263548;

  /* Typography */
  --font-sans:          'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:          'JetBrains Mono', 'SF Mono', 'Cascadia Code', monospace;

  /* Spacing scale */
  --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;

  /* Radii */
  --radius-sm:          6px;
  --radius-md:          10px;
  --radius-lg:          16px;
  --radius-xl:          24px;

  /* Shadows */
  --shadow-sm:          0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:          0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg:          0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow-amber:  0 0 40px rgba(212,137,42,0.15);

  /* Transitions */
  --ease-out:           cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out:        cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast:           150ms;
  --dur-normal:         300ms;
  --dur-slow:           500ms;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

address {
  font-style: normal;
}

ul {
  list-style: none;
}

/* --- Typography ------------------------------------------ */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

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

/* --- Header ---------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.logo-mark {
  font-size: 1.4rem;
  color: var(--color-amber);
  line-height: 1;
}

.logo-text strong {
  color: var(--color-amber);
  font-weight: 700;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--dur-fast), background var(--dur-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--color-slate-700);
}

.nav-link.active {
  color: var(--color-amber);
  background: #1e2618;
}

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

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--dur-normal) var(--ease-out), opacity var(--dur-fast);
}

.mobile-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  opacity: 0;
}
.mobile-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero ------------------------------------------------ */
.hero {
  position: relative;
  padding: 140px var(--space-xl) var(--space-4xl);
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  overflow: hidden;
}

.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 30%, #1a2815 0%, transparent 70%),
    radial-gradient(ellipse 500px 500px at 80% 60%, #1a1a2e 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-amber);
  background: #1e2618;
  border: 1px solid #2a3a1e;
  border-radius: 20px;
  margin-bottom: var(--space-lg);
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.hero-accent {
  color: var(--color-amber);
  position: relative;
}

.hero-accent::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-amber);
  border-radius: 2px;
  opacity: 0.4;
}

.hero-subtitle {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: var(--space-xl);
}

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

/* --- Buttons --------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.6rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-amber);
  color: #0f1724;
}

.btn-primary:hover {
  background: #e09a3a;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(212,137,42,0.3);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-card);
}

.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--color-slate-400);
  background: var(--color-slate-800);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* --- Hero Visual — animated node graph ------------------- */
.hero-visual {
  position: relative;
  width: 100%;
  height: 400px;
  z-index: 0;
}

.hero-node {
  position: absolute;
  width: 14px;
  height: 14px;
  background: var(--color-amber);
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(212,137,42,0.5);
}

.hero-node.n1 { top: 15%;  left: 20%; animation: nodePulse 3s ease-in-out 0s infinite; }
.hero-node.n2 { top: 50%;  left: 60%; animation: nodePulse 3s ease-in-out 0.5s infinite; }
.hero-node.n3 { top: 70%;  left: 30%; animation: nodePulse 3s ease-in-out 1s infinite; }
.hero-node.n4 { top: 25%;  left: 75%; animation: nodePulse 3s ease-in-out 1.5s infinite; width: 10px; height: 10px; }
.hero-node.n5 { top: 80%;  left: 70%; animation: nodePulse 3s ease-in-out 2s infinite; width: 10px; height: 10px; }

.hero-edge {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, var(--color-amber) 0%, transparent 100%);
  transform-origin: left center;
  opacity: 0.25;
}

.hero-edge.e1 { top: 17%;  left: 24%; width: 140px; transform: rotate(25deg); }
.hero-edge.e2 { top: 52%;  left: 34%; width: 120px; transform: rotate(-15deg); }
.hero-edge.e3 { top: 28%;  left: 62%; width: 90px;  transform: rotate(40deg); }
.hero-edge.e4 { top: 72%;  left: 34%; width: 150px; transform: rotate(-30deg); }

@keyframes nodePulse {
  0%, 100% { transform: scale(1);   opacity: 0.9; }
  50%      { transform: scale(1.6); opacity: 0.5; }
}

/* --- Sections -------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-amber);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Services -------------------------------------------- */
.services {
  padding: var(--space-4xl) var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

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

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--dur-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-amber), transparent);
  opacity: 0;
  transition: opacity var(--dur-normal);
}

.service-card:hover {
  background: var(--bg-card-hover);
  border-color: #31455e;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
  opacity: 1;
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1e2618;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-lg);
  color: var(--color-amber);
}

.service-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.service-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.service-tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--color-slate-700);
  color: var(--text-muted);
}

/* --- About ----------------------------------------------- */
.about {
  padding: var(--space-4xl) var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

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

.about-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
  margin-bottom: var(--space-lg);
}

.about-text p:last-of-type {
  margin-bottom: var(--space-xl);
}

.about-contact {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.contact-value {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  transition: color var(--dur-fast);
}

a.contact-value:hover {
  color: var(--color-amber);
}

.contact-value.address {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* --- About Geo Visual ------------------------------------ */
.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-geo {
  position: relative;
  width: 320px;
  height: 280px;
  background:
    radial-gradient(circle at 30% 40%, #1e2618 0%, transparent 60%),
    radial-gradient(circle at 70% 70%, #1a1a2e 0%, transparent 60%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.geo-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-amber);
  box-shadow: 0 0 10px rgba(212,137,42,0.6);
}

.dot-hq  { top: 45%; left: 60%; width: 12px; height: 12px; background: var(--color-ember); }
.dot-apac { top: 50%; left: 72%; }
.dot-na  { top: 25%; left: 18%; }
.dot-eu  { top: 22%; left: 40%; }

.geo-line {
  position: absolute;
  height: 1px;
  background: var(--color-slate-600);
  transform-origin: left center;
  opacity: 0.4;
}

.gl1 { top: 47%; left: 62%; width: 50px;  transform: rotate(-10deg); }
.gl2 { top: 47%; left: 25%; width: 140px; transform: rotate(-5deg); }
.gl3 { top: 46%; left: 46%; width: 60px;  transform: rotate(20deg); }

/* --- CTA ------------------------------------------------- */
.cta {
  padding: var(--space-4xl) var(--space-xl);
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.cta-content {
  padding: var(--space-3xl) var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.cta-content::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(212,137,42,0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.cta-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

/* --- Footer ---------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-header);
  padding: var(--space-xl) var(--space-xl);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-nav a {
  color: var(--text-muted);
}

.footer-nav a:hover {
  color: var(--text-primary);
}

.footer-sep {
  color: var(--color-slate-600);
  user-select: none;
}

/* --- Legal Pages ----------------------------------------- */
.legal-hero {
  padding: 120px var(--space-xl) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.legal-content {
  padding: 0 var(--space-xl) var(--space-4xl);
  max-width: 800px;
  margin: 0 auto;
}

.legal-body {
  color: var(--text-secondary);
}

.legal-body h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.legal-body h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.legal-body p {
  margin-bottom: var(--space-md);
  line-height: 1.75;
  font-size: 0.95rem;
}

.legal-body ul {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
  list-style: disc;
}

.legal-body ul li {
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.legal-body ul li::marker {
  color: var(--color-amber);
}

.legal-body strong {
  color: var(--text-primary);
}

.legal-rule {
  height: 1px;
  background: var(--border-subtle);
  margin: var(--space-xl) 0 var(--space-lg);
}

.legal-contact-card {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* --- Mobile nav overlay ---------------------------------- */
@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: var(--space-md);
    transform: translateY(-110%);
    transition: transform var(--dur-normal) var(--ease-out);
    z-index: 99;
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .main-nav .nav-link {
    width: 100%;
    padding: 0.7rem 1rem;
    font-size: 1rem;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 100px;
    text-align: center;
  }

  .hero-subtitle {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-contact {
    grid-template-columns: 1fr;
  }

  .about-visual {
    order: -1;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 960px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  .hero-actions {
    flex-direction: column;
  }

  .about-contact {
    grid-template-columns: 1fr;
  }
}

/* --- Utility: reduced motion ----------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}