/* ===== Qiangwei — dark theme, violet accent ===== */

:root {
  --bg: #0E0D16;
  --bg-alt: #141220;
  --surface: #1B1830;
  --surface-2: #211D38;
  --border: #2B2744;
  --text: #E9E7F2;
  --text-muted: #A9A4C4;
  --accent: #8B5CF6;
  --accent-dark: #6D3FDB;
  --accent-light: #A78BFA;
  --indigo: #312E81;
  --board-bg: #0F1A18;
  --board-line: #1E2B28;
  --positive: #34D399;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-size: 16px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  background-color: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

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

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

/* ===== Cloud navigation ===== */
.cloud-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: #0E0D16;
  border-bottom: 1px solid var(--border);
}

.cloud-nav.scrolled {
  box-shadow: 0 8px 30px #000000;
}

.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.cloud-shape {
  position: relative;
  width: 44px;
  height: 22px;
  border: 2px solid var(--accent);
  border-radius: 14px;
  background-color: transparent;
}

.cloud-shape::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 7px;
  width: 20px;
  height: 20px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background-color: #0E0D16;
  border-bottom-color: transparent;
  border-left-color: transparent;
}

.cloud-shape::after {
  content: "";
  position: absolute;
  top: -15px;
  left: 19px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background-color: #0E0D16;
  border-bottom-color: transparent;
  border-right-color: transparent;
}

.wordmark {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-light);
}

.nav-cta {
  flex-shrink: 0;
  background-color: var(--accent);
  color: #FFFFFF;
  padding: 11px 22px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  transition: background-color 0.2s ease;
}

.nav-cta:hover {
  background-color: var(--accent-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle .bar {
  width: 26px;
  height: 3px;
  background-color: var(--text);
  border-radius: 2px;
}

/* ===== Circuit board hero ===== */
.circuit-hero {
  padding: 84px 0 96px;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-kicker {
  color: var(--accent-light);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 13px;
  margin-bottom: 18px;
}

.hero-title {
  font-size: 52px;
  line-height: 1.12;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 560px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 16px;
  text-align: center;
  transition: 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-dark);
}

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

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

.hero-meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 15px;
}

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

.board {
  position: relative;
  width: 380px;
  height: 300px;
  background-color: var(--board-bg);
  border: 1px solid var(--board-line);
  border-radius: 14px;
  box-shadow: 0 24px 60px #000000;
}

.trace {
  position: absolute;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
}

.t1 { top: 46px; left: 36px; width: 90px; height: 60px; }
.t2 { top: 150px; left: 30px; width: 60px; height: 70px; border-color: var(--indigo) var(--indigo) transparent transparent; }
.t3 { bottom: 48px; left: 80px; width: 130px; height: 44px; }
.t4 { top: 40px; right: 44px; width: 80px; height: 90px; border-color: var(--indigo) var(--indigo) transparent transparent; }
.t5 { top: 160px; right: 30px; width: 120px; height: 40px; }
.t6 { bottom: 30px; right: 80px; width: 90px; height: 70px; border-color: var(--indigo) var(--indigo) transparent transparent; }

.pad {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent);
}

.p1 { top: 36px; left: 26px; }
.p2 { top: 140px; left: 20px; background-color: var(--indigo); }
.p3 { bottom: 38px; left: 210px; }
.p4 { top: 30px; right: 124px; background-color: var(--indigo); }
.p5 { top: 150px; right: 20px; }
.p6 { bottom: 20px; right: 170px; background-color: var(--indigo); }
.p7 { bottom: 82px; left: 70px; }
.p8 { top: 108px; right: 132px; }

.chip {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background-color: var(--indigo);
  border: 2px solid var(--accent);
  border-radius: 6px;
}

/* ===== Statement row ===== */
.statement-row {
  background-color: var(--indigo);
  padding: 72px 0;
}

.statement-text {
  font-size: 30px;
  line-height: 1.4;
  font-weight: 600;
  color: #FFFFFF;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

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

.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.section-kicker {
  color: var(--accent-light);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 13px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 34px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.about-body p {
  color: var(--text-muted);
  font-size: 17px;
  margin-bottom: 18px;
}

/* ===== Stats ===== */
.stats-section {
  padding: 72px 0;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent-light);
  line-height: 1;
  margin-bottom: 10px;
}

.stat-label {
  color: var(--text-muted);
  font-size: 15px;
}

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

.services-head {
  max-width: 680px;
  margin-bottom: 48px;
}

.section-lede {
  color: var(--text-muted);
  font-size: 17px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.service-num {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 14px;
}

.service-card h3 {
  font-size: 20px;
  color: var(--text);
  margin-bottom: 12px;
}

.service-card p {
  color: var(--text-muted);
  font-size: 15px;
}

/* ===== Process ===== */
.process-section {
  padding: 96px 0;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
}

.process-head {
  max-width: 680px;
  margin-bottom: 48px;
}

.process-list {
  list-style: none;
  position: relative;
  padding-left: 8px;
}

.process-list::before {
  content: "";
  position: absolute;
  left: 33px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background-color: var(--accent);
}

.process-step {
  position: relative;
  display: flex;
  gap: 28px;
  padding: 20px 0;
  padding-left: 8px;
}

.step-num {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--surface);
  border: 2px solid var(--accent);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.step-body h3 {
  font-size: 21px;
  color: var(--text);
  margin-bottom: 8px;
}

.step-body p {
  color: var(--text-muted);
  font-size: 16px;
}

/* ===== Pricing / comparison table ===== */
.pricing-section {
  padding: 96px 0;
  background-color: var(--bg);
}

.pricing-head {
  max-width: 680px;
  margin-bottom: 48px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.compare-table thead th {
  background-color: var(--surface-2);
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
}

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

.compare-table tbody th {
  color: var(--text);
  font-weight: 500;
  background-color: var(--surface);
}

.compare-table td {
  color: var(--text-muted);
  font-size: 15px;
}

.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===== FAQ ===== */
.faq-section {
  padding: 96px 0;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
}

.faq-head {
  max-width: 680px;
  margin-bottom: 40px;
}

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

.faq-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 14px;
  background-color: var(--bg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-question::after {
  content: "+";
  font-size: 24px;
  font-weight: 400;
  color: var(--accent-light);
  transition: transform 0.2s ease;
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

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

.faq-answer p {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 16px;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

/* ===== CTA band ===== */
.cta-band {
  padding: 80px 0;
  background-color: var(--accent-dark);
}

.cta-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.cta-title {
  font-size: 32px;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.cta-sub {
  color: #E4DDF7;
  font-size: 17px;
}

.cta-right {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

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

.cta-band .btn-ghost {
  border-color: #FFFFFF;
  color: #FFFFFF;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}

.contact-list {
  list-style: none;
  margin-top: 24px;
}

.contact-list li {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
}

.contact-label {
  color: var(--text-muted);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.contact-list a {
  color: var(--text);
  font-size: 17px;
}

.contact-list a:hover {
  color: var(--accent-light);
}

.contact-form {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: block;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 8px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
}

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

.form-note {
  margin-top: 14px;
  color: var(--positive);
  font-size: 15px;
}

/* ===== Footer ===== */
.site-footer {
  background-color: var(--bg-alt);
  border-top: 2px solid var(--accent);
  padding-top: 56px;
}

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

.footer-col h3 {
  color: var(--text);
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-col p {
  color: var(--text-muted);
  font-size: 15px;
}

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

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 15px;
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 22px;
  padding-bottom: 22px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-title {
    font-size: 40px;
  }
  .board {
    width: 100%;
    max-width: 380px;
  }
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .cta-split {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .cta-right {
    justify-content: flex-start;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .nav-links {
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .nav-links.open {
    max-height: 420px;
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links a {
    display: block;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
  }
  .nav-cta {
    display: none;
  }
  .hero-title {
    font-size: 32px;
  }
  .hero-sub {
    font-size: 16px;
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .statement-text {
    font-size: 22px;
  }
  .stat-value {
    font-size: 36px;
  }
  .process-step {
    gap: 18px;
  }
}