/* ============================
   CSS DESIGN SYSTEM – 律岛数科
   ============================ */
:root {
  --primary: #4f8ef7;
  --primary-dark: #2563eb;
  --accent: #7c3aed;
  --accent-light: #a78bfa;
  --bg: #07080f;
  --bg-2: #0d0f1a;
  --bg-3: #111427;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(79,142,247,0.4);
  --text: #f0f2ff;
  --text-muted: #8892b0;
  --text-dim: #4a5568;
  --glow-blue: rgba(79,142,247,0.15);
  --glow-purple: rgba(124,58,237,0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --shadow: 0 8px 40px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(79,142,247,0.15);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font: 'Noto Sans SC', 'Inter', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== SECTION COMMON ===== */
.section-header {
  text-align: center;
  margin-bottom: 72px;
}
.section-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--primary);
  background: rgba(79,142,247,0.1);
  border: 1px solid rgba(79,142,247,0.25);
  border-radius: 20px;
  padding: 5px 16px;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.2;
}
.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(7,8,15,0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 900;
  color: white;
  box-shadow: 0 4px 20px rgba(79,142,247,0.4);
}
.logo-text { display: flex; flex-direction: column; }
.logo-main {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.logo-sub {
  font-size: 9px;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-top: 3px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0 auto;
}
.nav-link {
  display: block;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--text);
  background: var(--bg-card);
}
.nav-cta {
  flex-shrink: 0;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  border-radius: 10px;
  color: white;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}
.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(79,142,247,0.4);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
#particleCanvas {
  width: 100%;
  height: 100%;
  display: block;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 120px 24px 80px;
  max-width: 800px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(79,142,247,0.08);
  border: 1px solid rgba(79,142,247,0.3);
  border-radius: 50px;
  padding: 8px 20px;
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease both;
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%,100% { opacity:1; transform: scale(1); }
  50% { opacity:0.6; transform: scale(1.3); }
}
.hero-title {
  font-size: clamp(52px, 8vw, 96px);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s 0.1s ease both;
}
.title-line {
  display: block;
  color: var(--text);
}
.title-accent {
  display: block;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 40px;
  line-height: 1.8;
  animation: fadeInUp 0.8s 0.2s ease both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
  animation: fadeInUp 0.8s 0.3s ease both;
}
.btn-primary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  border-radius: 12px;
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(79,142,247,0.4);
}
.btn-ghost {
  padding: 14px 32px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}
.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--text);
  background: var(--bg-card);
}
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  animation: fadeInUp 0.8s 0.4s ease both;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}
.stat-num::after { content: '+'; color: var(--primary); }
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 11px;
  letter-spacing: 2px;
  z-index: 2;
  animation: fadeIn 1s 1s ease both;
}
.scroll-arrow {
  width: 20px; height: 30px;
  border: 2px solid var(--text-dim);
  border-radius: 10px;
  position: relative;
}
.scroll-arrow::after {
  content: '';
  position: absolute;
  top: 4px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--text-dim);
  border-radius: 2px;
  animation: scrollDown 1.5s infinite;
}
@keyframes scrollDown {
  0% { transform: translateX(-50%) translateY(0); opacity:1; }
  100% { transform: translateX(-50%) translateY(10px); opacity:0; }
}

/* ===== ABOUT ===== */
.about {
  padding: 120px 0;
  background: var(--bg-2);
  position: relative;
  overflow: hidden;
}
.about::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-purple), transparent 70%);
  pointer-events: none;
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.about-card-primary {
  background: linear-gradient(135deg, rgba(79,142,247,0.12), rgba(124,58,237,0.12));
  border: 1px solid rgba(79,142,247,0.25);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  position: relative;
  overflow: hidden;
}
.about-card-primary::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.about-icon-wrap {
  width: 72px; height: 72px;
  background: rgba(79,142,247,0.15);
  border-radius: 16px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--primary);
}
.about-card-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}
.about-card-num span { color: var(--primary); font-size: 22px; }
.about-card-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}
.about-card-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.about-card-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-muted);
}
.dot-green {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #10b981;
  animation: pulse 2s infinite;
}
.about-license > div:first-child {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.about-code {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  font-family: 'Inter', monospace;
  letter-spacing: 1px;
}
.about-orb {
  position: absolute;
  right: -40px; bottom: -40px;
  width: 150px; height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-blue), transparent 70%);
  pointer-events: none;
}
.about-content { }
.about-desc {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.9;
}
.about-desc strong { color: var(--primary); font-weight: 600; }
.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}
.tag {
  padding: 6px 16px;
  border-radius: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}
.tag:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.about-info { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.info-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}
.info-row svg { flex-shrink: 0; color: var(--primary); margin-top: 2px; }

/* ===== SERVICES ===== */
.services {
  padding: 120px 0;
  background: var(--bg);
  position: relative;
  overflow: hidden;
}
.services::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 800px; height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-blue), transparent 55%);
  pointer-events: none;
  opacity: 0.5;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: default;
}
.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--glow-blue), transparent);
  opacity: 0;
  transition: var(--transition);
}
.service-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.service-card:hover::before { opacity: 1; }
.service-card.featured {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(79,142,247,0.1) 0%, rgba(124,58,237,0.05) 100%);
  border-color: rgba(79,142,247,0.3);
}
.service-card.featured-purple {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(124,58,237,0.1) 0%, rgba(79,142,247,0.05) 100%);
  border-color: rgba(124,58,237,0.3);
}
.service-icon {
  width: 60px; height: 60px;
  background: rgba(79,142,247,0.1);
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  color: var(--primary);
  transition: var(--transition);
}
.service-card:hover .service-icon {
  background: rgba(79,142,247,0.2);
  transform: scale(1.05);
}
.service-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.service-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}
.service-tags span {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(79,142,247,0.1);
  border: 1px solid rgba(79,142,247,0.2);
  color: var(--primary);
}
.service-arrow {
  position: absolute;
  bottom: 24px; right: 24px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(79,142,247,0.1);
  display: grid;
  place-items: center;
  color: var(--primary);
  opacity: 0;
  transform: translateX(-8px);
  transition: var(--transition);
}
.service-card:hover .service-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ===== ADVANTAGES ===== */
.advantages {
  padding: 120px 0;
  background: var(--bg-2);
}
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  transition: var(--transition);
}
.adv-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.adv-num {
  position: absolute;
  top: 24px; right: 24px;
  font-size: 48px;
  font-weight: 900;
  color: rgba(79,142,247,0.06);
  line-height: 1;
  font-family: 'Inter', sans-serif;
}
.adv-icon {
  width: 56px; height: 56px;
  background: rgba(79,142,247,0.1);
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--primary);
  margin-bottom: 20px;
}
.adv-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.adv-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===== TECH STRIP ===== */
.tech-strip {
  padding: 28px 0;
  background: var(--bg-3);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.tech-strip-inner {
  position: relative;
  overflow: hidden;
}
.tech-strip-track {
  display: flex;
  gap: 24px;
  white-space: nowrap;
  animation: slideLeft 30s linear infinite;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  align-items: center;
}
.tech-strip-track .sep {
  color: var(--primary);
  font-size: 18px;
}
@keyframes slideLeft {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ===== CONTACT ===== */
.contact {
  padding: 120px 0;
  background: var(--bg);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.contact-card:hover {
  border-color: var(--border-hover);
}
.contact-icon {
  width: 44px; height: 44px;
  background: rgba(79,142,247,0.1);
  border-radius: 10px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--primary);
}
.contact-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.contact-val {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
  line-height: 1.5;
}
.contact-form {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}
.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-size: 14px;
  font-family: var(--font);
  transition: var(--transition);
  resize: none;
  outline: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-dim); }
.form-group select { cursor: pointer; }
.form-group select option { background: var(--bg-3); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,142,247,0.1);
}
.btn-submit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(79,142,247,0.4);
}
.form-success {
  display: none;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  padding: 14px;
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: var(--radius-sm);
  color: #10b981;
  font-size: 14px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  text-decoration: none;
}
.footer-tagline {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul li,
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 8px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1100px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .service-card.featured,
  .service-card.featured-purple { grid-column: span 1; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: 1fr; }
  .adv-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 28px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(7,8,15,0.97);
    backdrop-filter: blur(20px);
    padding: 24px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
    z-index: 999;
  }
}