/* ============================================================
   Lunzun — Systems Architecture & Integration
   Dark theme · indigo/blue accent on near-black
   ============================================================ */

:root {
  --bg: #0B0E14;
  --bg-2: #0F131D;
  --surface: #121826;
  --surface-2: #161E30;
  --border: #232B3D;
  --border-strong: #2E3850;
  --text: #E8EAED;
  --text-2: #AAB3C5;
  --text-3: #7C8698;
  --accent: #6366F1;
  --accent-2: #3B82F6;
  --accent-3: #818CF8;
  --cyan: #22D3EE;
  --good: #34D399;
  --warn: #FBBF24;
  --radius: 14px;
  --radius-lg: 20px;
  --maxw: 1180px;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, "Menlo", monospace;
  --font-display: "Sora", "Inter", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-size: 16px;
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
}

p { color: var(--text-2); }

a { color: var(--accent-3); text-decoration: none; }
a:hover { color: var(--text); }

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

section { position: relative; }

/* ============ Navigation (toolbar / dock) ============ */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 72px;
  display: flex;
  align-items: center;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.main-nav.scrolled {
  background-color: #0B0E14;
  border-bottom-color: var(--border-strong);
}

.main-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-brand .brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: #0B0E14;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px;
}

.nav-links a {
  color: var(--text-2);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-links a:hover {
  color: var(--text);
  background-color: var(--surface-2);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  white-space: nowrap;
}

.nav-status .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--good);
  box-shadow: 0 0 0 0 #34D399;
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--accent-3);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost:hover {
  border-color: var(--accent-3);
  color: var(--accent-3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 11px 10px;
  cursor: pointer;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background-color: var(--text);
  border-radius: 2px;
  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); }

/* Mobile nav panel */
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  z-index: 999;
  background-color: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px 28px;
}

.mobile-menu.open { display: block; }

.mobile-menu a {
  display: block;
  padding: 14px 4px;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  border-bottom: 1px solid var(--border);
}

.mobile-menu a:last-of-type { border-bottom: none; }

/* ============ Hero ============ */
.hero-section {
  padding: 160px 0 90px;
  background-color: var(--bg);
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 0%, #000 30%, transparent 75%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 22px;
}

.hero-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background-color: var(--accent);
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
  margin-bottom: 24px;
}

.hero-copy h1 .accent {
  color: var(--accent-3);
}

.hero-copy .lead {
  font-size: 1.13rem;
  color: var(--text-2);
  max-width: 34rem;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Telemetry card cluster */
.telemetry {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.telemetry .card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.telemetry .card .card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.telemetry .card .card-head .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
}

.telemetry .card .card-head .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--good);
  background-color: #0F2A20;
  padding: 4px 10px;
  border-radius: 999px;
}

.telemetry .stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.telemetry .stat {
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
}

.telemetry .stat .num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 6px;
}

.telemetry .stat .num.blue { color: var(--accent-3); }

.telemetry .stat .cap {
  font-size: 0.72rem;
  color: var(--text-3);
  letter-spacing: 0.03em;
}

.telemetry .card.offset { margin-left: 44px; }

.bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.bar-row .bar-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-3);
  width: 74px;
}

.bar-row .bar {
  flex: 1;
  height: 8px;
  background-color: var(--bg-2);
  border-radius: 999px;
  overflow: hidden;
}

.bar-row .bar span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
}

/* ============ Capability stack (numbered) ============ */
.capabilities-section {
  padding: 96px 0;
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 720px;
  margin-bottom: 60px;
}

.section-head .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 14px;
  display: block;
}

.section-head h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  margin-bottom: 16px;
}

.section-head p {
  font-size: 1.05rem;
}

.cap-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.cap-item {
  display: grid;
  grid-template-columns: 110px 1fr 1.2fr;
  gap: 24px;
  align-items: start;
  padding: 34px 0;
  border-bottom: 1px solid var(--border);
}

.cap-item .cap-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-3);
}

.cap-item .cap-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}

.cap-item .cap-desc {
  color: var(--text-2);
  font-size: 0.98rem;
}

/* ============ Modules (horizontal scroll) ============ */
.modules-section {
  padding: 96px 0;
  background-color: var(--bg);
}

.modules-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 8px 4px 24px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.modules-scroll::-webkit-scrollbar { height: 6px; }
.modules-scroll::-webkit-scrollbar-track { background: var(--bg-2); border-radius: 999px; }
.modules-scroll::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; }

.module-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.module-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.module-card .module-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  margin-bottom: 18px;
}

.module-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.module-card p {
  font-size: 0.92rem;
}

/* ============ Comparison table ============ */
.compare-section {
  padding: 96px 0;
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.compare-table th,
.compare-table td {
  padding: 18px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.compare-table thead th {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text);
}

.compare-table thead th.highlight {
  color: var(--accent-3);
}

.compare-table tbody td {
  color: var(--text-2);
}

.compare-table tbody td:first-child {
  color: var(--text-3);
  font-weight: 500;
}

.compare-table .check {
  color: var(--good);
  font-weight: 700;
}

.compare-table .cross {
  color: var(--text-3);
}

/* ============ Process timeline ============ */
.process-section {
  padding: 96px 0;
  background-color: var(--bg);
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(99,102,241,0.6), rgba(34,211,238,0.6));
}

.timeline-item {
  position: relative;
  padding: 0 0 40px 24px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item .t-dot {
  position: absolute;
  left: -33px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
}

.timeline-item .t-phase {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 6px;
}

.timeline-item h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.timeline-item p {
  max-width: 46rem;
}

/* ============ Metrics band ============ */
.metrics-section {
  padding: 90px 0;
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.metric {
  text-align: center;
  padding: 24px;
}

.metric .metric-num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 8px;
}

.metric .metric-num span { color: var(--accent-3); }

.metric .metric-cap {
  color: var(--text-3);
  font-size: 0.92rem;
}

/* ============ FAQ ============ */
.faq-section {
  padding: 96px 0;
  background-color: var(--bg);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 14px;
  background-color: var(--surface);
  overflow: hidden;
}

.faq-item button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  padding: 20px 24px;
  cursor: pointer;
}

.faq-item button .faq-icon {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  color: var(--accent-3);
  transition: transform 0.25s ease;
}

.faq-item.open button .faq-icon { transform: rotate(45deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer p {
  padding: 0 24px 22px;
  color: var(--text-2);
}

/* ============ Contact / CTA ============ */
.contact-section {
  padding: 96px 0;
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  margin-bottom: 18px;
}

.contact-info p {
  max-width: 30rem;
  margin-bottom: 28px;
}

.contact-lines {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-line {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-2);
}

.contact-line .c-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 1.05rem;
  flex: 0 0 auto;
}

.contact-line a { color: var(--text-2); }
.contact-line a:hover { color: var(--accent-3); }

.contact-form {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.form-field {
  margin-bottom: 18px;
}

.form-field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 8px;
}

.form-field input,
.form-field textarea {
  width: 100%;
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-field textarea { resize: vertical; min-height: 120px; }

.form-status {
  font-size: 0.88rem;
  color: var(--good);
  margin-top: 14px;
  min-height: 1.2em;
}

/* ============ Footer ============ */
.site-footer {
  background-color: var(--bg);
  border-top: 1px solid var(--border);
  padding: 70px 0 0;
  position: relative;
  overflow: hidden;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-col h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 18px;
  font-family: var(--font-display);
}

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

.footer-col ul li { margin-bottom: 11px; }

.footer-col ul a {
  color: var(--text-2);
  font-size: 0.94rem;
}

.footer-col ul a:hover { color: var(--accent-3); }

.footer-brand p {
  margin-top: 16px;
  max-width: 20rem;
  font-size: 0.94rem;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-3);
}

.footer-watermark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(4rem, 14vw, 12rem);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--bg-2);
  text-align: center;
  margin-top: -8px;
  pointer-events: none;
  user-select: none;
  -webkit-text-stroke: 1px var(--border);
  visibility: hidden;
}

/* ============ Reveal animation (safe fallback) ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .telemetry .card.offset { margin-left: 0; }
  .cap-item { grid-template-columns: 60px 1fr; }
  .cap-item .cap-desc { grid-column: 2; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
  .nav-status { display: none; }
  .nav-toggle { display: flex; }
}

@media (max-width: 600px) {
  .hero-section { padding: 120px 0 70px; }
  .telemetry .stat-row { grid-template-columns: repeat(3, 1fr); }
  .metrics-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
  .btn { padding: 11px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .nav-status .dot { animation: none; }
}