/* ============================================
   yor-tech Website — Main Stylesheet
   又耳科技 官网样式
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg-deep: #060b1f;
  --bg-mid: #0a1a3a;
  --bg-light: #0d1b3e;
  --cyan: #00d4ff;
  --cyan-dim: rgba(0, 212, 255, 0.4);
  --cyan-glow: rgba(0, 212, 255, 0.15);
  --purple: #7b2fff;
  --purple-dim: rgba(123, 47, 255, 0.4);
  --purple-glow: rgba(123, 47, 255, 0.12);
  --gradient: linear-gradient(90deg, var(--cyan), var(--purple));
  --text-primary: #e0e8f0;
  --text-secondary: #a0b4d0;
  --text-muted: #5a7a9a;
  --border-dim: rgba(0, 212, 255, 0.12);
  --border-glow: rgba(0, 212, 255, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 64px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

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

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

/* --- Section Common --- */
.section {
  padding: 100px 0;
  position: relative;
}

.section-label {
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--cyan);
  text-align: center;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  text-align: center;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--gradient);
  margin: 16px auto 48px;
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), border-color var(--transition),
              box-shadow var(--transition);
}

.nav.scrolled {
  background: rgba(6, 11, 31, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.12);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1001;
}

.nav-logo svg {
  width: 38px;
  height: 38px;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
}

.nav-logo-en {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-logo-cn {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-size: 13px;
  color: var(--text-secondary);
  letter-spacing: 1px;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Language Toggle */
.lang-toggle {
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid var(--border-dim);
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  margin-left: 16px;
  white-space: nowrap;
  z-index: 1001;
}

.lang-toggle:hover {
  background: rgba(0, 212, 255, 0.12);
  border-color: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.15);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--cyan);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(180deg, #060b1f 0%, #0a1a3a 40%, #0d1b3e 100%);
}

#particles-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-glow-top {
  position: absolute;
  top: -120px;
  right: -80px;
  width: 350px;
  height: 350px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 180, 255, 0.1) 0%, transparent 70%);
  pointer-events: none;
  animation: glowBreathe 4s ease-in-out infinite;
}

.hero-glow-bottom {
  position: absolute;
  bottom: -140px;
  left: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 40, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
  animation: glowBreathe 5s ease-in-out infinite reverse;
}

.hero-grid-line {
  position: absolute;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.06), transparent);
  pointer-events: none;
}

.hero-grid-line:nth-child(3) { top: 45%; }
.hero-grid-line:nth-child(4) { bottom: 25%; }

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
}

.hero-title {
  font-size: clamp(36px, 8vw, 64px);
  font-weight: 900;
  letter-spacing: 8px;
  background: linear-gradient(90deg, var(--cyan) 0%, #4facfe 40%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(0, 212, 255, 0.3));
  margin-bottom: 12px;
  line-height: 1.2;
}

.hero-subtitle-en {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  font-size: clamp(13px, 2.5vw, 17px);
  color: var(--text-secondary);
  letter-spacing: 3px;
  margin-bottom: 8px;
}

.hero-tagline {
  font-size: clamp(13px, 2vw, 15px);
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-divider {
  width: 60px;
  height: 2px;
  background: var(--gradient);
  margin: 0 auto 28px;
  border-radius: 1px;
}

.hero-buttons {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 28px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 36px rgba(0, 212, 255, 0.45);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border: 1px solid var(--cyan-dim);
}

.btn-outline:hover {
  border-color: var(--cyan);
  background: rgba(0, 212, 255, 0.06);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  text-align: center;
}

.hero-scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(180deg, var(--cyan-dim), transparent);
  margin: 0 auto;
}

.hero-scroll-text {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 2px;
  margin-top: 8px;
  animation: fadeInOut 2s ease-in-out infinite;
}

/* --- About Section --- */
#about {
  background: linear-gradient(180deg, var(--bg-mid), var(--bg-light));
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.about-text p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  background: rgba(0, 212, 255, 0.03);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  transition: all var(--transition);
}

.stat-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.08);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 36px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

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

.service-card {
  background: rgba(0, 212, 255, 0.02);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

.service-card:nth-child(2) {
  background: rgba(123, 47, 255, 0.02);
  border-color: rgba(123, 47, 255, 0.12);
}

.service-card:nth-child(2):hover {
  border-color: rgba(123, 47, 255, 0.35);
  box-shadow: 0 8px 40px rgba(123, 47, 255, 0.1);
}

.service-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 8px 40px rgba(0, 212, 255, 0.1);
  transform: translateY(-6px);
}

.service-card-glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}

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

.service-card-glow.top-right {
  top: -30px;
  right: -30px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.12), transparent 70%);
}

.service-card:nth-child(2) .service-card-glow.bottom-left {
  top: auto;
  bottom: -30px;
  left: -30px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(123, 47, 255, 0.12), transparent 70%);
}

.service-icon {
  font-size: 40px;
  margin-bottom: 16px;
  position: relative;
}

.service-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
}

.service-card:nth-child(1) .service-card-title { color: var(--cyan); }
.service-card:nth-child(2) .service-card-title { color: #b388ff; }
.service-card:nth-child(3) .service-card-title { color: var(--cyan); }

.service-card-list {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 2.2;
  position: relative;
}

/* --- Tech Stack --- */
#tech {
  background: linear-gradient(180deg, var(--bg-light), var(--bg-mid));
}

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

.tech-category {
  background: rgba(0, 212, 255, 0.02);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}

.tech-category:hover {
  border-color: var(--border-glow);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.06);
}

.tech-cat-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.tech-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: 20px;
  font-size: 12px;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.tech-tag:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.15);
}

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

.team-card {
  background: rgba(0, 212, 255, 0.02);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  transition: all var(--transition);
}

.team-card:hover {
  border-color: var(--border-glow);
  box-shadow: 0 8px 36px rgba(0, 212, 255, 0.08);
  transform: translateY(-6px);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}

.team-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-role {
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.team-bio {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- Testimonials --- */
#testimonials {
  background: linear-gradient(180deg, var(--bg-mid), var(--bg-light));
}

.testimonial-carousel {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  min-height: 200px;
}

.testimonial-slide {
  text-align: center;
  padding: 20px;
  display: none;
  animation: fadeSlideIn 0.5s ease;
}

.testimonial-slide.active {
  display: block;
}

.testimonial-quote {
  font-size: 16px;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  position: relative;
}

.testimonial-quote::before {
  content: '"';
  font-size: 60px;
  font-weight: 900;
  color: var(--cyan);
  opacity: 0.2;
  position: absolute;
  top: -30px;
  left: -10px;
  line-height: 1;
}

.testimonial-author {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.testimonial-company {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.2);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.carousel-dot.active {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  width: 24px;
  border-radius: 4px;
}

.carousel-arrows {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.carousel-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-dim);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-arrow:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

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

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(0, 212, 255, 0.03);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.08);
}

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

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 8px;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.contact-info-icon {
  font-size: 20px;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
}

.contact-info-text h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.contact-info-text p {
  font-size: 13px;
  color: var(--text-muted);
}

/* --- Footer --- */
.footer {
  padding: 32px 0;
  border-top: 1px solid rgba(0, 212, 255, 0.08);
  text-align: center;
}

.footer-logo {
  margin-bottom: 16px;
}

.footer-logo-en {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 3px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-logo-cn {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 2px;
}

.footer-copy {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

/* --- Animations --- */
@keyframes glowBreathe {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.08); opacity: 1; }
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Background glow orbs for sections --- */
.section-glow-top {
  position: absolute;
  top: -80px;
  right: -60px;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 180, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.section-glow-bottom {
  position: absolute;
  bottom: -100px;
  left: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(120, 40, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

/* --- Mobile Nav --- */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    background: rgba(6, 11, 31, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--border-dim);
    transition: right var(--transition);
    padding: 40px;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links a {
    font-size: 16px;
  }

  .nav-toggle { display: flex; }

  .lang-toggle {
    margin-left: auto;
    margin-right: 12px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tech-categories {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .section {
    padding: 70px 0;
  }
}

@media (max-width: 480px) {
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .stat-card {
    padding: 16px 8px;
  }

  .stat-number {
    font-size: 24px;
  }

  .team-grid {
    grid-template-columns: 1fr;
    max-width: 280px;
    margin: 0 auto;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
}