/* === Fonts === */
@font-face {
  font-family: 'Alimama ShuHeiTi';
  src: url(https://acc-1258344699.cos.accelerate.myqcloud.com/web/website/assets/AlimamaShuHeiTi-Bold.woff2) format('woff2');
  font-display: swap;
  font-weight: 700;
}

/* === CSS Variables === */
:root {
  --primary: #28B894;
  --primary-dark: #1E9A7A;
  --primary-light: rgba(40, 184, 148, 0.1);
  --bg: #000000;
  --bg-alt: #0A0A0A;
  --card-bg: #191A23;
  --card-border: rgba(239, 238, 236, 0.08);
  --card-border-hover: rgba(50, 230, 185, 0.3);
  --text: #FFFFFF;
  --text-light: rgba(239, 238, 236, 0.65);
  --text-muted: rgba(239, 238, 236, 0.4);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --radius: 20px;
  --radius-sm: 4px;
  --radius-md: 12px;
  --transition: all 0.3s ease;
  --font-cn: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-en: 'Inter', -apple-system, sans-serif;
  --max-width: 1400px;
  --header-height: 72px;
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  font-family: var(--font-cn);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 40px; }
.section { padding: 100px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: clamp(28px, 4.2vw, 72px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.section-subtitle {
  font-size: clamp(14px, 1.1vw, 18px);
  color: var(--text-light);
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
  line-height: 1.8;
}
.text-primary { color: var(--primary); }

/* === Header / Nav === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(239, 238, 236, 0.06);
  z-index: 1000;
  transition: var(--transition);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  font-family: 'Alimama ShuHeiTi', var(--font-cn);
}
.logo-dot { color: var(--primary); }
.main-nav {
  display: flex;
  align-items: center;
  gap: 40px;
}
.main-nav ul {
  display: flex;
  gap: 32px;
}
.nav-link {
  font-size: 0.9rem;
  color: var(--text-light);
  transition: color var(--transition);
  position: relative;
  font-weight: 500;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-cta { margin-left: 8px; }

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-family: var(--font-cn);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  letter-spacing: 0.03em;
}
.btn-primary {
  background: var(--primary);
  color: #000;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 20px rgba(40, 184, 148, 0.3); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 14px 36px; font-size: 1rem; }

/* === Hero === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(40, 184, 148, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(40, 184, 148, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
#ai-bg-canvas {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}
.hero-container { display: flex; align-items: center; justify-content: space-between; position: relative; z-index: 1; gap: 60px; }
.hero-content { flex: 1; max-width: 600px; }
.hero-image { flex: 1; max-width: 500px; display: flex; justify-content: center; }
.hero-mascot-img { width: 100%; height: auto; object-fit: contain; }
.hero-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(40, 184, 148, 0.2);
}

.hero-badge-sub {
  display: inline-block;
  color: var(--text-light);
  font-size: 0.8rem;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.hero-title {
  font-size: clamp(32px, 5vw, 72px);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}
.hero-desc {
  font-size: clamp(14px, 1.2vw, 20px);
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 600px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }


.hero-phone {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.phone-icon { font-size: 1.5rem; }
.phone-number {
  color: var(--primary);
  font-weight: 800;
  font-size: 1.8rem;
  text-decoration: none;
  font-family: var(--font-en);
  letter-spacing: 2px;
  transition: var(--transition);
}
.phone-number:hover { color: var(--primary-hover); text-decoration: underline; }
.phone-tip { color: var(--text-light); font-size: 0.95rem; font-weight: 400; }
/* === FDE Section === */
#about-fde {
  background: var(--bg-alt);
  position: relative;
}
#about-fde::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: radial-gradient(rgba(40, 184, 148, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

/* Definition card */
.fde-definition-card {
  max-width: 800px;
  margin: 0 auto 48px;
  background: linear-gradient(135deg, rgba(40, 184, 148, 0.08) 0%, rgba(25, 26, 35, 0.8) 50%);
  border: 1px solid rgba(40, 184, 148, 0.15);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  position: relative;
}
.fde-definition-card::after {
  content: '';
  position: absolute;
  top: -1px; left: 30%; right: 30%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  border-radius: 2px;
}
.fde-def-icon { font-size: 3rem; margin-bottom: 20px; }
.fde-def-text {
  font-size: clamp(15px, 1.1vw, 18px);
  line-height: 1.9;
  color: var(--text-light);
}
.fde-def-text strong { color: var(--text); }

/* Three aspect grid */
.fde-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto 48px;
}
.fde-grid-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
}
.fde-grid-card:hover { border-color: var(--card-border-hover); transform: translateY(-4px); box-shadow: var(--shadow); }
.fde-grid-icon { font-size: 2rem; margin-bottom: 16px; }
.fde-grid-card h3 { font-size: 1.1rem; margin-bottom: 12px; font-weight: 600; }
.fde-grid-card p { color: var(--text-light); line-height: 1.7; font-size: 0.88rem; }
.fde-grid-card p strong { color: var(--text); }

/* Stats bar */
.fde-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}
.fde-stat {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-md);
  background: rgba(40, 184, 148, 0.06);
  border: 1px solid rgba(40, 184, 148, 0.1);
}
.fde-stat-num {
  display: block;
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 6px;
}
.fde-stat-label {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* === Services - Flow Layout === */
.flow-track {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 1100px;
  margin: 0 auto;
}
.flow-item {
  flex: 1;
  min-width: 0;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(24px);
}
.flow-item.visible {
  opacity: 1;
  transform: translateY(0);
}
.flow-item:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.flow-num {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--primary);
  letter-spacing: 3px;
  margin-bottom: 12px;
  font-weight: 600;
}
.flow-item h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  font-weight: 600;
  line-height: 1.4;
}
.flow-item p {
  color: var(--text-light);
  line-height: 1.6;
  font-size: 0.85rem;
}
.flow-connector {
  flex-shrink: 0;
  width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary);
  position: relative;
}
.flow-connector::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--primary);
  opacity: 0.2;
}
.flow-connector span { position: relative; z-index: 1; }

/* === AI Matrix === */
.matrix-grid { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 20px; max-width: var(--max-width); margin: 0 auto; }
.matrix-group {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.matrix-group:hover { border-color: var(--card-border-hover); transform: translateY(-2px); box-shadow: var(--shadow); }
.matrix-group-highlight {
  border-color: rgba(40, 184, 148, 0.3);
  background: rgba(40, 184, 148, 0.06);
}
.matrix-dept {
  font-size: 0.95rem;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(239, 238, 236, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}
.matrix-count {
  font-family: var(--font-en);
  font-size: 0.75rem;
  background: rgba(40, 184, 148, 0.15);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 10px;
}
.matrix-list li {
  padding: 8px 0;
  border-bottom: 1px solid rgba(239, 238, 236, 0.04);
  font-size: 0.85rem;
  line-height: 1.5;
}
.matrix-list li:last-child { border-bottom: none; }
.matrix-list li span { color: var(--text-light); font-size: 0.8rem; }
/* --- Matrix v2: 11 departments --- */
.matrix-grid-wide { max-width: 1400px; }
.matrix-pain {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid rgba(239, 238, 236, 0.06);
  line-height: 1.5;
}
.matrix-fit {
  font-size: 0.78rem;
  margin-top: 6px;
  line-height: 1.5;
}
.matrix-label { 
  color: var(--text-secondary); 
  margin-right: 4px;
  font-weight: 500;
}
.stars { color: #f0b429; letter-spacing: 1px; }
.matrix-match-5 { border-left: 3px solid var(--primary); }
.matrix-match-4 { border-left: 3px solid #60a5fa; }
.matrix-match-3 { border-left: 3px solid #a78bfa; }
.matrix-list li span { display: block; color: var(--text-light); font-size: 0.78rem; margin-top: 1px; }


/* === Process === */
.process-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  max-width: 1000px;
  margin: 0 auto 32px;
  flex-wrap: wrap;
}
.process-step {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  flex: 1;
  min-width: 150px;
  transition: var(--transition);
}
.process-step:hover { border-color: var(--card-border-hover); transform: translateY(-4px); box-shadow: var(--shadow); }
.step-highlight { border-color: rgba(40, 184, 148, 0.3); background: rgba(40, 184, 148, 0.06); }
.step-number {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}
.process-step h3 { font-size: 1rem; margin-bottom: 8px; font-weight: 600; }
.process-step p { font-size: 0.85rem; color: var(--text-light); line-height: 1.6; }
.process-arrow {
  font-size: 1.5rem;
  color: var(--primary);
  font-weight: 300;
  flex-shrink: 0;
  opacity: 0.5;
}
.process-loop {
  text-align: center;
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* === About Us === */
.company-intro {
  max-width: 800px;
  margin: 0 auto 48px;
  text-align: center;
  line-height: 1.9;
}
.company-intro p {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 16px;
}
.company-intro p:last-child { margin-bottom: 0; }
.company-intro strong { color: var(--text); }

.subsection-title {
  font-size: 1.3rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 32px;
}
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; max-width: 800px; margin: 0 auto; }
.skill-group {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.skill-group:hover { border-color: var(--card-border-hover); }
.skill-group h4 { font-size: 0.95rem; margin-bottom: 14px; font-weight: 600; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: rgba(239, 238, 236, 0.06);
  color: var(--text-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid rgba(239, 238, 236, 0.06);
}
.tag-accent {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(40, 184, 148, 0.2);
}

/* === Contact === */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; max-width: 1000px; margin: 0 auto; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card-bg);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  transition: var(--transition);
}
.contact-item:hover { border-color: var(--card-border-hover); }
.contact-icon { font-size: 1.5rem; }
.contact-item strong { font-size: 0.9rem; display: block; margin-bottom: 2px; }
.contact-item span { color: var(--text-light); font-size: 0.9rem; }
.contact-philosophy {
  background: rgba(40, 184, 148, 0.06);
  border: 1px solid rgba(40, 184, 148, 0.2);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  font-size: 0.9rem;
  line-height: 1.6;
}
.contact-philosophy strong { color: var(--primary); }
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--card-bg);
  padding: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  font-family: var(--font-cn);
  font-size: 0.95rem;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(40, 184, 148, 0.1);
  background: rgba(255, 255, 255, 0.05);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder { color: var(--text-muted); }
.contact-form select option { background: var(--card-bg); color: var(--text); }

/* === Footer === */
.site-footer {
  background: var(--card-bg);
  color: var(--text-light);
  padding: 60px 0 32px;
  border-top: 1px solid var(--card-border);
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(239, 238, 236, 0.06);
  margin-bottom: 24px;
}
.footer-brand strong { font-size: 1.05rem; color: var(--text); font-weight: 600; }
.footer-brand p { font-size: 0.85rem; margin-top: 8px; color: var(--text-muted); }
.footer-links { display: flex; gap: 32px; }
.footer-links a { font-size: 0.9rem; color: var(--text-light); transition: var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* === Mobile Toggle === */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .matrix-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 80px 0; }
  .section-title { font-size: 28px; }
  .section-subtitle { font-size: 14px; margin-bottom: 40px; }

  .mobile-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.98);
    flex-direction: column;
    padding: 28px 20px;
    border-bottom: 1px solid var(--card-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    backdrop-filter: blur(20px);
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav ul { flex-direction: column; gap: 20px; }
  .nav-cta { margin-left: 0; margin-top: 12px; text-align: center; }

  
.hero-badge-sub {
  display: inline-block;
  color: var(--text-light);
  font-size: 0.8rem;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.hero-title { font-size: 32px; }
  .hero-desc { font-size: 15px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .hero-container { flex-direction: column; gap: 40px; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero-image { max-width: 320px; }
  .hero-badge { margin-left: auto; margin-right: auto; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-phone { justify-content: center; flex-wrap: wrap; }
  .hero::before { width: 300px; height: 300px; }
  .hero::after { width: 200px; height: 200px; }

  .fde-grid,
  .skills-grid,
  .contact-grid,
  .matrix-grid { grid-template-columns: 1fr; }

  .flow-track { flex-direction: column; gap: 0; }
  .flow-connector { width: auto; height: 32px; }
  .flow-connector::before { width: 1px; height: 100%; left: 50%; right: auto; top: 0; }

  .fde-stats { grid-template-columns: repeat(2, 1fr); }

  .process-steps { flex-direction: column; }
  .process-arrow { transform: rotate(90deg); }
  .footer-content { flex-direction: column; gap: 20px; }
  .footer-links { flex-wrap: wrap; gap: 20px; }
  .footer-bottom { flex-direction: column; gap: 4px; text-align: center; }
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--card-bg); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(239, 238, 236, 0.2); }