/* ============================================
   芸尚芊艺网络科技 - 设计系统 & 全局样式
   ============================================ */

/* --- 设计 Token --- */
:root {
  --color-primary: #00d2ff;
  --color-primary-dark: #3a7bd5;
  --color-primary-gradient: linear-gradient(135deg, #00d2ff, #3a7bd5);
  --color-accent: #7c3aed;
  --color-accent-gradient: linear-gradient(135deg, #7c3aed, #a855f7);
  --color-bg-dark: #0f0c29;
  --color-bg-mid: #302b63;
  --color-bg-light: #24243e;
  --color-bg-gradient: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  --color-text: #ffffff;
  --color-text-muted: rgba(255, 255, 255, 0.7);
  --color-text-dim: rgba(255, 255, 255, 0.4);
  --color-glass-bg: rgba(255, 255, 255, 0.05);
  --color-glass-border: rgba(255, 255, 255, 0.1);
  --color-glass-hover: rgba(255, 255, 255, 0.1);
  --color-success: #10b981;
  --color-error: #ef4444;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 4px 20px rgba(0, 210, 255, 0.3);
  --shadow-glow-accent: 0 4px 20px rgba(124, 58, 237, 0.3);
  --section-padding: 100px 50px;
  --nav-height: 70px;
  --container-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg-gradient);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

ul {
  list-style: none;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition);
}

input,
textarea {
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

::selection {
  background: rgba(0, 210, 255, 0.3);
  color: #fff;
}

::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-primary-dark);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* --- 工具类 --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

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

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 3px;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 1.05rem;
  font-weight: 600;
  background: var(--color-primary-gradient);
  color: #fff;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-glow);
  transition: all var(--transition);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 210, 255, 0.5);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 1.05rem;
  font-weight: 600;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

/* --- 导航栏 --- */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 50px;
  background: rgba(15, 12, 41, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-glass-border);
  transition: all var(--transition);
}

.navbar.scrolled {
  background: rgba(15, 12, 41, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.navbar.hidden {
  transform: translateY(-100%);
}

.nav-brand {
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}

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

.nav-links a {
  padding: 8px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-glass-bg);
}

.nav-links a.active::after {
  width: 60%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  transform-origin: center;
}

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

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

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

/* --- Hero 区域 --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 20px;
  overflow: hidden;
}

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

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
}

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

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  background: linear-gradient(90deg, #00d2ff, #3a7bd5, #7c3aed, #00d2ff);
  background-size: 300% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 4s linear infinite;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-dim);
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: float 2.5s ease-in-out infinite;
}

.hero-scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--color-text-dim);
  border-bottom: 2px solid var(--color-text-dim);
  transform: rotate(45deg);
  animation: scroll-bounce 2s infinite;
}

/* --- 服务板块 --- */
.services {
  padding: var(--section-padding);
  background: rgba(15, 12, 41, 0.5);
}

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

.service-card {
  position: relative;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition);
  overflow: hidden;
  perspective: 1000px;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-primary-gradient);
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: rgba(0, 210, 255, 0.3);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
  opacity: 0.03;
}

.service-icon {
  position: relative;
  z-index: 1;
  width: 60px;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  transition: transform var(--transition);
}

.service-card:hover .service-icon {
  transform: scale(1.1) rotate(-5deg);
}

.service-icon svg {
  width: 28px;
  height: 28px;
  color: #fff;
}

.service-card h3 {
  position: relative;
  z-index: 1;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card p {
  position: relative;
  z-index: 1;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.service-tags {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.service-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(0, 210, 255, 0.1);
  color: var(--color-primary);
  border: 1px solid rgba(0, 210, 255, 0.2);
}

/* --- 关于板块 --- */
.about {
  padding: var(--section-padding);
  background: rgba(36, 36, 62, 0.5);
}

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

.about-text h2 {
  font-size: 2.5rem;
  margin-bottom: 24px;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.stat-item {
  text-align: center;
  padding: 20px;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.stat-item:hover {
  border-color: rgba(0, 210, 255, 0.3);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-number .suffix {
  font-size: 1.4rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.about-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-visual-inner {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-circle {
  position: absolute;
  border: 2px solid rgba(0, 210, 255, 0.15);
  border-radius: 50%;
  animation: pulse-ring 4s ease-in-out infinite;
}

.about-circle:nth-child(1) {
  width: 100%;
  height: 100%;
}

.about-circle:nth-child(2) {
  width: 70%;
  height: 70%;
  animation-delay: 1s;
}

.about-circle:nth-child(3) {
  width: 40%;
  height: 40%;
  animation-delay: 2s;
  background: var(--color-primary-gradient);
  opacity: 0.15;
}

.about-logo {
  position: relative;
  z-index: 1;
  width: 80px;
  height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--color-primary-gradient);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
}

.about-logo svg {
  width: 40px;
  height: 40px;
  color: #fff;
}

/* --- 案例板块 --- */
.projects {
  padding: var(--section-padding);
  background: rgba(15, 12, 41, 0.5);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 210, 255, 0.3);
  box-shadow: var(--shadow-lg);
}

.project-image {
  width: 100%;
  height: 220px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.project-image svg {
  width: 60px;
  height: 60px;
  opacity: 0.4;
}

.project-body {
  padding: 24px;
}

.project-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-body p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tech span {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(124, 58, 237, 0.1);
  color: var(--color-accent);
  border: 1px solid rgba(124, 58, 237, 0.2);
}

/* --- 团队板块 --- */
.team {
  padding: var(--section-padding);
  background: rgba(36, 36, 62, 0.5);
}

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

.team-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 210, 255, 0.3);
  box-shadow: var(--shadow-lg);
}

.team-avatar {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--color-primary-gradient);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}

.team-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.team-role {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.team-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.team-social {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
}

.team-social a {
  width: 32px;
  height: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  transition: all var(--transition);
}

.team-social a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.team-social a svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
}

.team-social a:hover svg {
  color: #fff;
}

/* --- 联系板块 --- */
.contact {
  padding: var(--section-padding);
  background: rgba(15, 12, 41, 0.8);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 50px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.contact-info > p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

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

.contact-method {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.contact-method:hover {
  border-color: rgba(0, 210, 255, 0.3);
  transform: translateX(4px);
}

.contact-method-icon {
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--color-primary-gradient);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.contact-method-icon svg {
  width: 20px;
  height: 20px;
  color: #fff;
}

.contact-method-text label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-bottom: 2px;
}

.contact-method-text span {
  font-size: 0.95rem;
  color: var(--color-text);
}

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

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 14px 16px;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 0.95rem;
  transition: all var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 210, 255, 0.15);
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-group .error-msg {
  font-size: 0.8rem;
  color: var(--color-error);
  display: none;
}

.form-group .error-msg.visible {
  display: block;
}

.form-submit {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  font-size: 1.05rem;
  font-weight: 600;
  background: var(--color-primary-gradient);
  color: #fff;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-glow);
  transition: all var(--transition);
  align-self: flex-start;
}

.form-submit:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 210, 255, 0.5);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-submit .spinner {
  display: none;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.form-submit.loading .spinner {
  display: block;
}

.form-submit.loading .btn-text {
  display: none;
}

.form-feedback {
  display: none;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
}

.form-feedback.success {
  display: block;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--color-success);
}

.form-feedback.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--color-error);
}

/* --- 页脚 --- */
.footer {
  padding: 60px 50px 30px;
  background: rgba(0, 0, 0, 0.6);
  border-top: 1px solid var(--color-glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-glass-border);
}

.footer-brand h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  background: var(--color-primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-3px);
}

.footer-social a svg {
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
}

.footer-social a:hover svg {
  color: #fff;
}

.footer-bottom {
  max-width: var(--container-max);
  margin: 20px auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--color-text-dim);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: var(--color-text-dim);
  transition: color var(--transition);
}

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

/* --- 回到顶部 --- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  width: 48px;
  height: 48px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--color-primary-gradient);
  border-radius: 50%;
  box-shadow: var(--shadow-glow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 210, 255, 0.5);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
  color: #fff;
}

/* --- 滚动入场动画 --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* --- 关键帧动画 --- */
@keyframes gradient-shift {
  0% { background-position: 0% center; }
  100% { background-position: 300% center; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.05); opacity: 0.2; }
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-8px); }
}

@keyframes scroll-bounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.4; }
  50% { transform: rotate(45deg) translate(4px, 4px); opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 响应式设计 ===== */

/* 平板 (≤1024px) */
@media (max-width: 1024px) {
  :root {
    --section-padding: 70px 30px;
  }

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

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

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

  .hero-title {
    font-size: 3rem;
  }

  .about-grid {
    gap: 40px;
  }

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

/* 手机 (≤768px) */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
    --section-padding: 60px 20px;
  }

  .navbar {
    padding: 0 20px;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    flex-direction: column;
    background: rgba(15, 12, 41, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--color-glass-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

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

  .section-title {
    font-size: 1.8rem;
  }

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

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

  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .about-visual {
    order: -1;
  }

  .about-visual-inner {
    max-width: 300px;
  }

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

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

  .team-card {
    padding: 24px 16px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* 小手机 (≤480px) */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

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

  .about-stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}