/* ============================================
   衣玄 YIXUAN — 品牌官网样式
   VI System: 银灰金属 + 亮蓝渐变
   ============================================ */

:root {
  /* Brand Colors */
  --color-primary: #0088FF;
  --color-primary-light: #00C2FF;
  --color-primary-dark: #0055CC;
  --color-accent: #00E5FF;

  /* Metallic Silver Palette */
  --silver-100: #F5F7FA;
  --silver-200: #E8ECF0;
  --silver-300: #D0D7DE;
  --silver-400: #B0BAC5;
  --silver-500: #5E6E80;
  --silver-600: #6B7A8A;
  --silver-700: #4D5A68;
  --silver-800: #2E353E;
  --silver-900: #1A1F26;

  /* Background */
  --bg-white: #FFFFFF;
  --bg-light: #F8FAFC;
  --bg-silver: #F0F3F7;
  --bg-dark: #14181F;
  --bg-darker: #0D1016;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #0088FF 0%, #00C2FF 50%, #00E5FF 100%);
  --grad-silver: linear-gradient(135deg, #E8ECF0 0%, #B0BAC5 50%, #D0D7DE 100%);
  --grad-metallic: linear-gradient(135deg, #C8D0D8 0%, #8FA3B5 40%, #5B7FA0 70%, #00C2FF 100%);
  --grad-hero: linear-gradient(180deg, rgba(20, 24, 31, 0.3) 0%, rgba(20, 24, 31, 0.7) 100%);

  /* Typography */
  --font-display: 'Noto Serif SC', 'Noto Sans SC', serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --container-max: 1280px;
  --section-py: 84px;

  /* Effects */
  --shadow-sm: 0 1px 3px rgba(20, 24, 31, 0.06), 0 1px 2px rgba(20, 24, 31, 0.04);
  --shadow-md: 0 4px 12px rgba(20, 24, 31, 0.08), 0 2px 4px rgba(20, 24, 31, 0.04);
  --shadow-lg: 0 20px 40px rgba(20, 24, 31, 0.1), 0 4px 12px rgba(20, 24, 31, 0.06);
  --shadow-glow: 0 0 40px rgba(0, 194, 255, 0.15);

  /* Border */
  --border-color: var(--silver-200);
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;

  /* Transition */
  --trans-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --trans-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --trans-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--silver-800);
  background: var(--bg-white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--trans-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 40px;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--trans-base);
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(0px);
}

.nav.scrolled {
  padding: 14px 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-logo {
  height: 56px;
  width: auto;
  object-fit: contain;
  display: block;
}

.nav-brand-text {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--trans-base);
}

.nav.scrolled .nav-brand-text {
  color: var(--silver-900);
}

.nav-brand-en {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 3px;
  text-transform: uppercase;
  transition: color var(--trans-base);
}

.nav.scrolled .nav-brand-en {
  color: var(--silver-500);
}

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

.nav-link {
  font-size: 15px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  padding: 8px 0;
  transition: color var(--trans-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--grad-primary);
  transition: width var(--trans-base);
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 24px;
}

.nav.scrolled .nav-link {
  color: var(--silver-700);
}

.nav.scrolled .nav-link:hover,
.nav.scrolled .nav-link.active {
  color: var(--color-primary);
}

.nav-cta {
  padding: 10px 24px;
  background: var(--grad-primary);
  color: #062038;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: all var(--trans-base);
  box-shadow: 0 2px 8px rgba(0, 136, 255, 0.25);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 136, 255, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--trans-base);
}

.nav.scrolled .nav-toggle span {
  background: var(--silver-800);
}

.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);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(20, 24, 31, 0.55) 0%,
    rgba(20, 24, 31, 0.35) 50%,
    rgba(0, 136, 255, 0.15) 100%
  );
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 48px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 80px;
  align-items: center;
  width: 100%;
}

.hero-mark {
  position: relative;
}

.hero-v-mark {
  height: 180px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 10px 30px rgba(0, 194, 255, 0.3));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero-text {
  color: #fff;
  max-width: 680px;
}

.hero-eyebrow {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 500;
  font-style: normal;
  letter-spacing: 4px;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 4px;
  margin-bottom: 28px;
}

.hero-title-line {
  display: block;
  font-size: 1em;
  font-weight: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-title-line:nth-child(1) {
  animation-delay: 0.3s;
  color: #fff;
}

.hero-title-line:nth-child(2) {
  animation-delay: 0.5s;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 17px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.7s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.9s forwards;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  transition: all var(--trans-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: #062038;
  box-shadow: 0 4px 20px rgba(0, 136, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 136, 255, 0.45);
}

.btn-success {
  background: linear-gradient(135deg, #00C2FF 0%, #00E5FF 100%) !important;
  box-shadow: 0 4px 20px rgba(0, 194, 255, 0.35) !important;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-line {
  background: transparent;
  color: var(--color-primary);
  padding: 10px 0;
  font-weight: 500;
  border-bottom: 1px solid var(--color-primary);
  border-radius: 0;
}

.btn-line:hover {
  color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 11px;
  letter-spacing: 3px;
  opacity: 0;
  animation: fadeIn 1s ease 1.2s forwards;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.5), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { transform: scaleY(1); transform-origin: top; }
  50% { transform: scaleY(0.3); transform-origin: top; }
}

/* ============================================
   Section Common
   ============================================ */
.section {
  padding: var(--section-py) 0;
  position: relative;
}

.section-head {
  text-align: left;
  margin-bottom: 44px;
}

.section-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--silver-500);
  letter-spacing: 4px;
  margin-bottom: 16px;
  position: relative;
}

.section-num::before,
.section-num::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30px;
  height: 1px;
  background: var(--silver-300);
}

.section-num::before {
  right: calc(100% + 16px);
}

.section-num::after {
  left: calc(100% + 16px);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 3.2vw, 40px);
  font-weight: 600;
  color: var(--silver-900);
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 17px;
  color: var(--silver-600);
  max-width: 560px;
  margin: 0;
}

/* ============================================
   About Section
   ============================================ */
.about {
  background: var(--bg-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-info-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-item {
  display: flex;
  gap: 24px;
  padding: 22px 24px;
  background: var(--bg-silver);
  border-radius: var(--border-radius-md);
  transition: all var(--trans-base);
  border: 1px solid transparent;
}

.info-item:hover {
  border-color: var(--color-primary-light);
  background: var(--bg-white);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.info-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  border-radius: var(--border-radius-sm);
  color: #fff;
}

.info-icon svg {
  width: 26px;
  height: 26px;
}

.info-item h4 {
  font-size: 20px;
  font-weight: 600;
  color: var(--silver-900);
  margin-bottom: 8px;
}

.info-item p {
  font-size: 16px;
  color: var(--silver-600);
  line-height: 1.7;
}

.about-stats {
  display: flex;
  gap: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 600;
  background: var(--grad-metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.stat-label {
  font-size: 13px;
  color: var(--silver-500);
}

.about-visual {
  position: relative;
  height: 100%;
  display: flex;
}

.about-image-wrap {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  flex: 1;
  width: 100%;
}

.about-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-image-badge {
  position: absolute;
  bottom: 24px;
  right: 24px;
  background: var(--bg-white);
  padding: 16px 24px;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge-year {
  font-size: 11px;
  color: var(--silver-500);
  letter-spacing: 2px;
}

.badge-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 32px;
}

.feature-item {
  display: flex;
  gap: 20px;
  padding: 20px 24px;
  background: var(--bg-silver);
  border-radius: var(--border-radius-md);
  transition: all var(--trans-base);
  border: 1px solid transparent;
}

.feature-item:hover {
  border-color: var(--color-primary-light);
  background: var(--bg-white);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  border-radius: var(--border-radius-sm);
  color: #fff;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
}

.feature-item h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--silver-900);
  margin-bottom: 4px;
}

.feature-item p {
  font-size: 14px;
  color: var(--silver-600);
  line-height: 1.6;
}

/* ============================================
   Services Section
   ============================================ */
.services {
  background: var(--bg-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.service-card {
  background: var(--bg-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--trans-base);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.service-image-wrap {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}

.service-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--trans-slow);
}

.service-card:hover .service-image {
  transform: scale(1.05);
}

.service-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(20, 24, 31, 0.6) 100%);
}

.service-tag {
  position: absolute;
  bottom: 16px;
  left: 20px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  color: #fff;
  z-index: 1;
}

.service-body {
  padding: 20px 22px 24px;
}

.service-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--silver-900);
  margin-bottom: 8px;
}

.service-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver-600);
  margin-bottom: 14px;
}

.service-meta {
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.service-meta span {
  font-size: 13px;
  color: var(--silver-500);
}

/* CTA Card */
.service-cta-card {
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
}

.service-cta-inner {
  text-align: center;
  padding: 40px 32px;
  color: #fff;
}

.service-cta-icon img {
  height: 60px;
  width: auto;
  object-fit: contain;
  margin-bottom: 20px;
}

.service-cta-inner h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.service-cta-inner p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
  margin-bottom: 24px;
}

.service-cta-inner .btn-line {
  color: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

.service-cta-inner .btn-line:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* CTA Banner — 定制服务板块底部横版 */
.services-cta-banner {
  position: relative;
  margin-top: 40px;
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 26px 40px;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background:
    radial-gradient(120% 180% at 0% 0%, rgba(0, 136, 255, 0.18) 0%, rgba(0, 136, 255, 0) 55%),
    radial-gradient(110% 160% at 100% 100%, rgba(0, 229, 255, 0.10) 0%, rgba(0, 229, 255, 0) 55%),
    var(--bg-dark);
  border: 1px solid rgba(0, 229, 255, 0.14);
}

.services-cta-banner::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-accent), transparent);
  opacity: 0.6;
}

.cta-banner-icon {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
}

.cta-banner-icon img {
  height: 66px;
  width: auto;
  display: block;
}

.cta-banner-text {
  flex: 1 1 auto;
  min-width: 0;
}

.cta-banner-text h3 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 1px;
  line-height: 1.3;
  margin-bottom: 8px;
}

.cta-banner-text p {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.66);
  line-height: 1.7;
}

.cta-banner-action {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
}

.services-cta-banner .btn-line {
  color: var(--color-primary-light);
  border-bottom-color: var(--color-primary-light);
  font-size: 16px;
}

.services-cta-banner .btn-line:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

@media (max-width: 900px) {
  .services-cta-banner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
    padding: 32px 24px 34px;
  }

  .cta-banner-icon img {
    height: 52px;
  }

  .cta-banner-text h3 {
    font-size: 22px;
  }

  .cta-banner-text p {
    font-size: 14px;
  }
}

/* ============================================
   Advantages Section
   ============================================ */
.advantages {
  background: var(--bg-dark);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.advantages::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 194, 255, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.advantages::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(139, 168, 196, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.section-head-light .section-num {
  color: var(--silver-400);
}

.section-head-light .section-num::before,
.section-head-light .section-num::after {
  background: var(--silver-700);
}

.section-head-light .section-title {
  color: #fff;
}

.section-head-light .section-sub {
  color: var(--silver-400);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  z-index: 1;
}

.adv-card {
  padding: 24px 20px 22px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-lg);
  transition: all var(--trans-base);
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--grad-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--trans-base);
}

.adv-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(0, 194, 255, 0.3);
  transform: translateY(-4px);
}

.adv-card:hover::before {
  transform: scaleX(1);
}

.adv-number {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 300;
  background: var(--grad-metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
}

.adv-title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.adv-desc {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--silver-400);
  margin-bottom: 22px;
}

.adv-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.adv-tags span {
  padding: 5px 11px;
  font-size: 11.5px;
  color: var(--color-primary-light);
  background: rgba(0, 194, 255, 0.08);
  border: 1px solid rgba(0, 194, 255, 0.2);
  border-radius: 100px;
}

/* 4 列在窄屏会挤，平板回到 2 列 */
@media (max-width: 1100px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .adv-card {
    padding: 28px 24px 26px;
  }
}

/* ============================================
   Clients Section
   ============================================ */
.clients {
  background: var(--bg-white);
}

/* 左：院校与企业合并为一张卡；右：成功案例 */
.clients-split {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: 32px;
  align-items: stretch;
}

.clients-col {
  display: flex;
  flex-direction: column;
  gap: 28px;
  min-width: 0;
}

.clients-col .clients-card {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
}

.clients-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 28px 26px;
  transition: all var(--trans-base);
}

.clients-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
  transform: translateY(-4px);
}

.clients-card-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.clients-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-primary);
  border-radius: var(--border-radius-sm);
  color: #fff;
  margin-bottom: 4px;
}

.clients-icon svg {
  width: 24px;
  height: 24px;
}

.clients-card-head h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--silver-900);
  letter-spacing: 1px;
}

.clients-card-head p {
  font-size: 14px;
  color: var(--silver-500);
}

.clients-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.clients-tags span {
  padding: 8px 16px;
  font-size: 13px;
  color: var(--silver-700);
  background: var(--bg-silver);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  transition: all var(--trans-fast);
}

.clients-tags span:hover {
  background: rgba(0, 150, 255, 0.08);
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* 合作单位 Logo 墙：3 列网格，logo + 名称 */
.clients-logo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.client-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  padding: 12px 8px 10px;
  min-height: 142px;
  background: var(--bg-silver);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  text-align: center;
  transition: all var(--trans-fast);
}

.client-tile:hover {
  background: #fff;
  border-color: var(--color-primary-light);
  box-shadow: 0 8px 20px rgba(0, 130, 255, 0.10);
  transform: translateY(-2px);
}

.client-tile img {
  width: 82px;
  height: 82px;
  object-fit: contain;
  display: block;
}

.client-tile .client-name {
  font-size: 11px;
  line-height: 1.35;
  letter-spacing: 0;
  color: var(--silver-700);
  text-wrap: balance;
  word-break: break-word;
}

/* 无 logo 的单位：名称居中显示 */
.client-tile.is-text {
  justify-content: center;
}

.client-tile.is-text .client-name {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--silver-700);
  font-weight: 400;
}

.clients-note {
  margin: auto 0 0;
  padding-top: 24px;
  font-size: 12.5px;
  letter-spacing: 0.3px;
  color: var(--silver-500);
}

/* ============================================
   Factory Section
   ============================================ */
.factory {
  background: var(--bg-silver);
}

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

.factory-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all var(--trans-base);
}

.factory-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary-light);
}

.factory-video-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
  overflow: hidden;
}

.factory-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.factory-video-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: opacity var(--trans-base);
}

.factory-video-wrap:hover .factory-video-overlay {
  background: rgba(0, 0, 0, 0.3);
}

.factory-video-wrap video[controls]:playing ~ .factory-video-overlay,
.factory-video-playing .factory-video-overlay {
  opacity: 0;
  pointer-events: none;
}

.factory-play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: all var(--trans-base);
}

.factory-play-btn svg {
  width: 28px;
  height: 28px;
  margin-left: 3px;
}

.factory-info {
  padding: 24px 28px;
}

.factory-info h4 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--silver-900);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.factory-info p {
  font-size: 14px;
  color: var(--silver-500);
  line-height: 1.6;
}

/* ============================================
   Process Section
   ============================================ */
.process {
  background: var(--bg-white);
}

.process-timeline {
  position: relative;
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 0 8px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0 8px;
}

/* 横向贯穿的流程线：从第 1 个圆点中心到第 5 个圆点中心 */
.process-line {
  position: absolute;
  left: 10%;
  right: 10%;
  top: 86px;
  width: auto;
  height: 2px;
  background: linear-gradient(90deg,
      rgba(0, 136, 255, 0) 0%,
      var(--silver-300) 12%,
      var(--silver-300) 88%,
      rgba(0, 136, 255, 0) 100%);
}

.process-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
  padding: 0 8px;
  position: relative;
}

.process-step {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-num {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--bg-white);
  border: 2px solid var(--silver-300);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--silver-500);
  transition: all var(--trans-base);
  position: relative;
  z-index: 1;
}

.process-item:hover .step-num {
  border-color: var(--color-primary);
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 136, 255, 0.3);
}

.process-content {
  padding: 0;
  text-align: center;
}

.process-content h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--silver-900);
  margin-bottom: 12px;
}

.process-content p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver-600);
  max-width: none;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
  background: var(--bg-light);
}

.contact-wrap {
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  padding-top: 20px;
}

.contact-info .section-num {
  margin-bottom: 20px;
}

.contact-title {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 600;
  color: var(--silver-900);
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.contact-desc {
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver-600);
  margin-bottom: 48px;
  max-width: 440px;
}

.contact-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 14px;
  padding: 28px 20px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  transition: box-shadow var(--trans-base), border-color var(--trans-base);
}

.contact-item:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.contact-item > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.contact-icon {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  color: var(--color-primary);
  transition: all var(--trans-base);
}

.contact-item:hover .contact-icon {
  background: var(--grad-primary);
  color: #fff;
  border-color: transparent;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-item div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-label {
  font-size: 13px;
  color: var(--silver-500);
}

.contact-value {
  font-size: 18px;
  font-weight: 500;
  color: var(--silver-800);
}

.contact-item--qr div {
  gap: 8px;
}

.contact-qr-wrap {
  width: 120px;
  height: 120px;
  background: #fff;
  border-radius: var(--border-radius-sm);
  padding: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 4px;
}

.contact-qr {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.contact-qr-hint {
  font-size: 12px;
  color: var(--silver-500);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--bg-darker);
  color: var(--silver-400);
  padding: 52px 0 24px;
}

.footer-top {
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 2px;
}

.footer-logo-img {
  height: 52px;
  width: auto;
  object-fit: contain;
  display: block;
}

.footer-en {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--silver-500);
  letter-spacing: 3px;
}

.footer-tagline {
  font-size: 14px;
  color: var(--silver-500);
  line-height: 1.9;
  letter-spacing: 0.5px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-size: 13px;
  color: var(--silver-600);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
  position: fixed;
  right: 32px;
  bottom: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(0, 136, 255, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--trans-base);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 136, 255, 0.45);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .container {
    padding: 0 32px;
  }

  .nav-inner {
    padding: 0 32px;
  }

  .nav-links {
    gap: 28px;
  }

  .hero-content {
    padding: 0 32px;
    gap: 48px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-text {
    max-width: 100%;
  }

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

  .process-timeline {
    padding: 44px 0 8px;
    gap: 0 4px;
  }

  .process-line {
    top: 74px;
  }

  .process-item {
    gap: 20px;
    padding: 0 4px;
  }

  .step-num {
    width: 52px;
    height: 52px;
    font-size: 16px;
  }

  .process-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .process-content p {
    font-size: 13px;
    line-height: 1.8;
  }
}

@media (max-width: 768px) {
  :root {
    --section-py: 48px;
  }

  .container {
    padding: 0 18px;
  }

  .nav-inner {
    padding: 0 18px;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    padding: 7px 14px;
    font-size: 13px;
    margin-left: auto;
    margin-right: 14px;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    padding: 8px 24px 20px;
    gap: 0;
    box-shadow: 0 12px 24px rgba(20, 24, 31, 0.08);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.open .nav-link {
    display: block;
    padding: 14px 0;
    color: var(--silver-700);
    border-bottom: 1px solid var(--border-color);
    font-size: 15px;
  }

  .nav-links.open .nav-link:last-child {
    border-bottom: none;
  }

  .nav-links.open .nav-link.active {
    color: var(--color-primary);
  }

  .nav-links.open .nav-link::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    padding: 0 18px;
    gap: 28px;
  }

  .hero-v-mark {
    width: 80px;
    height: 80px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .hero-subtitle br {
    display: none;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .section-head {
    margin-bottom: 28px;
  }

  .section-num::before,
  .section-num::after {
    width: 20px;
  }

  .about-stats {
    gap: 24px;
  }

  .stat-num {
    font-size: 28px;
  }

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

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .adv-card {
    padding: 20px 18px;
  }

  .clients-split {
    grid-template-columns: 1fr;
  }

  .clients-card {
    padding: 20px 18px;
  }

  .factory-grid {
    grid-template-columns: 1fr;
  }

  .factory-play-btn {
    width: 52px;
    height: 52px;
  }

  .factory-play-btn svg {
    width: 22px;
    height: 22px;
  }

  /* 手机端回退为竖向时间轴 */
  .process-timeline {
    display: block;
    max-width: 100%;
    padding: 8px 0 0;
  }

  .process-line {
    left: 28px;
    right: auto;
    top: 20px;
    bottom: 20px;
    width: 1px;
    height: auto;
    background: var(--silver-200);
  }

  .process-item {
    flex-direction: row;
    align-items: flex-start;
    gap: 18px;
    padding: 16px 0;
  }

  .process-step {
    flex: 0 0 56px;
  }

  .process-content {
    text-align: left;
    padding-top: 6px;
  }

  .process-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
  }

  .step-num {
    width: 48px;
    height: 48px;
    font-size: 14px;
  }

  .section-title {
    font-size: 26px;
    letter-spacing: 1px;
  }

  .hero-mark {
    display: none;
  }

  .hero-title {
    font-size: 30px;
    letter-spacing: 2px;
  }

  .service-image-wrap {
    aspect-ratio: 16 / 10;
  }

  .service-body {
    padding: 16px 16px 18px;
  }

  .cases-panel {
    padding: 22px 16px 16px;
  }

  .footer {
    padding: 40px 0 20px;
  }

  .hero {
    min-height: 560px;
  }

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

  .contact-item {
    padding: 20px 16px;
  }

  .contact-title {
    font-size: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .about-stats {
    flex-direction: column;
    gap: 20px;
  }

  .clients-tags span {
    padding: 6px 12px;
    font-size: 12px;
  }

  .nav-brand-text {
    font-size: 18px;
  }
}

/* ============================================
   Scroll reveal animation
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============================================
   转化入口增强（修订版新增）
   ============================================ */

/* 电话可点击 */
.contact-value--link {
  color: var(--silver-800);
  text-decoration: none;
  transition: color 0.2s ease;
}
.contact-value--link:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.contact-hint {
  font-size: 12px;
  color: var(--silver-500);
}

/* 页脚备案信息 */
.footer-icp {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--silver-500);
}
.footer-icp a {
  color: inherit;
  text-decoration: none;
}
.footer-icp a:hover {
  color: var(--silver-800);
  text-decoration: underline;
}

@media (max-width: 480px) {
  .form-quick {
    grid-template-columns: 1fr;
  }
}


/* ===================== Cases 成功案例（合作业绩右栏） ===================== */
.cases-panel {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: 38px 30px 28px;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: box-shadow var(--trans-base), border-color var(--trans-base);
}

.cases-panel:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.cases-panel-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.cases-panel-head .clients-icon { margin-bottom: 4px; }

.cases-panel-head h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--silver-900);
  letter-spacing: 1px;
}

.cases-panel-head p {
  font-size: 14px;
  color: var(--silver-500);
  line-height: 1.6;
}

.cases-list {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.cases-list .case-item:first-child { padding-top: 10px; }

.case-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px dashed var(--border-color);
}

.case-item:last-child {
  border-bottom: 0;
  padding-bottom: 8px;
}

.case-item-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.case-item-body h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--silver-900);
}

.case-item-body ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.case-item-body li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver-600);
}

.case-item-body li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--grad-primary);
}

.case-item-body b { color: var(--silver-900); font-weight: 600; }

/* 窄屏：左右两栏堆叠 */
@media (max-width: 1180px) {
  .clients-split { grid-template-columns: 1fr; gap: 24px; }
  .cases-panel { padding: 26px 22px 22px; }
}
/* ---- 灯箱 ---- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 28px;
  background: rgba(13, 16, 22, 0.93);
  cursor: zoom-out;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: min(94vw, 780px);
  max-height: 88vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
}
.lightbox-close {
  position: absolute;
  top: 10px;
  right: 22px;
  color: #fff;
  font-size: 40px;
  line-height: 1;
  user-select: none;
}

/* ============================================
   合作单位 Logo 墙 · 单列与手机适配
   ============================================ */
@media (max-width: 1180px) {
  .clients-logo-grid { max-width: 720px; margin: 0 auto; gap: 14px; }
  .client-tile { min-height: 168px; }
  .client-tile img { width: 104px; height: 104px; }
  .client-tile .client-name { font-size: 12px; }
}

@media (max-width: 768px) {
  .clients-logo-grid { max-width: 100%; gap: 8px; }
  .client-tile { min-height: 132px; padding: 10px 6px 8px; gap: 6px; }
  .client-tile img { width: 68px; height: 68px; }
  .client-tile .client-name { font-size: 11px; line-height: 1.35; }
  .client-tile.is-text .client-name { font-size: 11.5px; }
}

@media (max-width: 560px) {
  /* 手机：2 列，名称能完整显示 */
  .clients-logo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .client-tile { min-height: 138px; padding: 12px 6px 10px; }
  .client-tile img { width: 72px; height: 72px; }
  .client-tile .client-name { font-size: 11.5px; }
  .client-tile.is-text .client-name { font-size: 12px; }
  /* 最后一家横跨两列，最后一行不留半个空格 */
  .clients-logo-grid > .client-tile:last-child { grid-column: 1 / -1; }
  .clients-logo-grid > .client-tile:last-child.is-text { min-height: 88px; }
  .clients-logo-grid > .client-tile:last-child.is-text { min-height: 88px; }
}

/* ============================================
   屏蔽妙搭导出时注入的「豆包 AI 生成」水印
   （原站由豆包妙搭生成，运行时会在右下角挂第三方水印）
   ============================================ */
div[data-custom-element^="doubao-watermark"],
div[data-custom-element$="-watermark"],
div[data-custom-element$="-watermark-mobile"] {
  display: none !important;
}