/* ================================================
   贵州众多科技有限公司官网样式
   科技感深色主题 · 渐变 · 动效
   ================================================ */

/* ---------- CSS 变量 & 重置 ---------- */
:root {
  --primary: #00d4ff;
  --secondary: #7b2fff;
  --accent: #ff6b35;
  --bg-deep: #020812;
  --bg-dark: #060f1e;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 212, 255, 0.3);
  --text-primary: #f0f6ff;
  --text-secondary: #8faabf;
  --text-muted: #4d6880;
  --grad-main: linear-gradient(135deg, #00d4ff 0%, #7b2fff 100%);
  --grad-card: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(123, 47, 255, 0.1) 100%);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-h: 72px;
  --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

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

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

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

ul {
  list-style: none;
}

img,
svg {
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font);
}

input,
textarea,
select {
  font-family: var(--font);
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: var(--transition);
}

.navbar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: transparent;
  backdrop-filter: blur(0px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled::before {
  background: rgba(2, 8, 18, 0.85);
  backdrop-filter: blur(20px);
  border-bottom-color: var(--border);
}

.nav-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon svg {
  width: 44px;
  height: 44px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-size: 18px;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.logo-sub {
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 2px;
  font-weight: 300;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--grad-main);
  border-radius: 2px;
  transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 60%;
}

.btn-contact {
  padding: 9px 22px;
  background: var(--grad-main);
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-contact:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

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

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

#particleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  padding-top: var(--nav-h);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px 6px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 24px;
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease both;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(1.4);
  }
}

.hero-title {
  display: flex;
  flex-direction: column;
  font-size: clamp(48px, 8vw, 100px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s 0.1s ease both;
}

.title-line {
  display: block;
}

.gradient-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 36px;
  line-height: 1.8;
  animation: fadeInUp 0.8s 0.2s ease both;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 56px;
  animation: fadeInUp 0.8s 0.3s ease both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--grad-main);
  border-radius: 50px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(0, 212, 255, 0.5);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  padding: 13px 32px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  animation: fadeInUp 0.8s 0.4s ease both;
}

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

.stat-num {
  font-size: 36px;
  font-weight: 800;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-unit {
  font-size: 20px;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: fadeInUp 1s 0.8s ease both;
}

.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--primary), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }

  50% {
    transform: scaleY(1);
    transform-origin: top;
  }

  51% {
    transform: scaleY(1);
    transform-origin: bottom;
  }

  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

.hero-scroll-indicator span {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 2px;
}

/* ---------- Section 通用 ---------- */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--primary);
  margin-bottom: 12px;
  opacity: 0.8;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* ---------- 关于我们 ---------- */
.about {
  background: var(--bg-dark);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.card-glow {
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  border-radius: inherit;
  background: var(--grad-main);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 0;
  pointer-events: none;
}

.about-card,
.contact-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  overflow: hidden;
  transition: var(--transition);
}

.about-card:hover .card-glow,
.contact-card:hover .card-glow {
  opacity: 0.06;
}

.about-card:hover,
.contact-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.about-card>*,
.contact-card>* {
  position: relative;
  z-index: 1;
}

.about-icon-wrap {
  margin-bottom: 20px;
}

.about-icon-wrap svg {
  width: 56px;
  height: 56px;
}

.about-card h3,
.contact-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
}

.about-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 20px;
}

.about-card strong {
  color: var(--primary);
}

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

.about-tags span {
  padding: 5px 14px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px;
  font-size: 12px;
  color: var(--primary);
}

.about-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  transition: var(--transition);
}

.info-card:hover {
  border-color: rgba(0, 212, 255, 0.25);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.info-icon {
  font-size: 22px;
  flex-shrink: 0;
}

.info-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.info-value {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.5;
}

/* ---------- 业务范围 ---------- */
.services {
  position: relative;
  background: var(--bg-deep);
}

.services-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 60% at 80% 20%, rgba(123, 47, 255, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.permit-banner {
  display: flex;
  align-items: center;
  gap: 20px;
  background: rgba(255, 107, 53, 0.06);
  border: 1px solid rgba(255, 107, 53, 0.2);
  border-radius: 12px;
  padding: 16px 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.permit-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
  white-space: nowrap;
  padding: 4px 12px;
  background: rgba(255, 107, 53, 0.12);
  border-radius: 6px;
}

.permit-items {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  flex: 1;
}

.permit-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.permit-sep {
  color: var(--text-muted);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.service-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  overflow: hidden;
  transition: var(--transition);
  cursor: default;
}

.service-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 212, 255, 0.12);
}

.service-card:hover .card-glow {
  opacity: 0.08;
}

.service-card>* {
  position: relative;
  z-index: 1;
}

.service-card.featured {
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08) 0%, rgba(123, 47, 255, 0.12) 100%);
  border-color: rgba(0, 212, 255, 0.25);
  grid-column: span 1;
}

.service-card-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-card);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 14px;
}

.service-card-icon svg {
  width: 28px;
  height: 28px;
}

.service-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.service-tag {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 12px;
  background: var(--grad-main);
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
}

/* ---------- 核心优势 ---------- */
.advantages {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.advantages::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

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

.adv-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--grad-main);
  opacity: 0;
  transition: var(--transition);
}

.adv-card:hover {
  border-color: rgba(0, 212, 255, 0.25);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 212, 255, 0.1);
}

.adv-card:hover::before {
  opacity: 1;
}

.adv-num {
  font-size: 48px;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.04);
  line-height: 1;
  margin-bottom: 16px;
  font-family: 'Courier New', monospace;
}

.adv-icon {
  font-size: 32px;
  margin-bottom: 14px;
}

.adv-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.adv-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ---------- 联系我们 ---------- */
.contact {
  position: relative;
  background: var(--bg-deep);
}

.contact-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.contact-grid {
  display: grid;

  gap: 24px;
  align-items: start;
}

.contact-card {
  height: 100%;
}

.contact-intro {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.8;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.ci-icon {
  width: 42px;
  height: 42px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
}

.ci-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.ci-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.ci-value {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.5;
}

a.ci-value:hover {
  color: var(--primary);
}

/* 表单 */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-primary);
  transition: var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238faabf' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  background-color: rgba(255, 255, 255, 0.04);
}

.form-group select option {
  background: #0d1b2a;
  color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
  background: rgba(0, 212, 255, 0.04);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.btn-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  background: var(--grad-main);
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.3);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 212, 255, 0.45);
}

/* ---------- 页脚 ---------- */
.footer {
  background: #010611;
}

.footer-top {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo svg {
  width: 36px;
  height: 36px;
}

.footer-logo span {
  font-size: 18px;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
}

.footer-links-group h4,
.footer-contact-info h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.footer-links-group ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-group a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links-group a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-contact-info p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.6;
}

.footer-contact-info a {
  color: var(--text-muted);
}

.footer-contact-info a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding: 20px 0;
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p,
.footer-bottom a {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-bottom a:hover {
  color: var(--primary);
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--grad-main);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 212, 255, 0.35);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: var(--transition);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 212, 255, 0.5);
}

/* ---------- 弹窗 ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: #0d1b2a;
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  max-width: 380px;
  width: 90%;
  transform: scale(0.9);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-icon {
  width: 64px;
  height: 64px;
  background: var(--grad-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
  margin: 0 auto 20px;
}

.modal h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.modal p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

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

/* ---------- AOS 动画 ---------- */
[data-aos] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-aos].aos-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --nav-h: 64px;
  }

  section {
    padding: 72px 0;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(2, 8, 18, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-110%);
    transition: var(--transition);
    gap: 4px;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: 8px;
  }

  .btn-contact {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: clamp(40px, 10vw, 56px);
  }

  .hero-stats {
    gap: 20px;
  }

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

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

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

  .about-info-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-primary,
  .btn-outline {
    width: 100%;
    justify-content: center;
  }

  .permit-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 212, 255, 0.3);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 212, 255, 0.5);
}

/* ---------- 选中颜色 ---------- */
::selection {
  background: rgba(0, 212, 255, 0.25);
  color: #fff;
}