```css
/* ============================================
   芒果视频 - 完整样式表
   风格：现代流媒体 / 芒果活力橙红
   ============================================ */

/* ---------- CSS 变量与主题系统 ---------- */
:root {
  /* 主色板 - 芒果红 */
  --mango-primary: #e63946;
  --mango-primary-dark: #c1121f;
  --mango-primary-light: #ff6b6b;
  --mango-accent: #ff9f1c;

  /* 中性色 */
  --bg-light: #f8f9fa;
  --bg-dark: #121212;
  --surface-light: #ffffff;
  --surface-dark: #1e1e1e;
  --text-light: #222222;
  --text-dark: #e0e0e0;
  --text-muted-light: #666666;
  --text-muted-dark: #aaaaaa;

  /* 功能色 */
  --border-light: #e9ecef;
  --border-dark: #333333;
  --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.03);
  --shadow-dark: 0 5px 15px rgba(0, 0, 0, 0.3);
  --glass-light: rgba(255, 255, 255, 0.85);
  --glass-dark: rgba(30, 30, 30, 0.9);

  /* 布局 */
  --container-max: 1280px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* 暗色模式变量覆盖 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--bg-dark);
    --surface: var(--surface-dark);
    --text: var(--text-dark);
    --text-muted: var(--text-muted-dark);
    --border: var(--border-dark);
    --shadow: var(--shadow-dark);
    --glass: var(--glass-dark);
  }
}

/* 亮色模式变量（默认） */
:root:not([data-theme="dark"]) {
  --bg: var(--bg-light);
  --surface: var(--surface-light);
  --text: var(--text-light);
  --text-muted: var(--text-muted-light);
  --border: var(--border-light);
  --shadow: var(--shadow-light);
  --glass: var(--glass-light);
}

/* ---------- 重置与基础 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  min-height: 100vh;
}

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

a {
  color: var(--mango-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--mango-primary-dark);
}

ul, ol {
  list-style: none;
}

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

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--mango-primary);
  border-radius: 4px;
}

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

/* ---------- 选择文本样式 ---------- */
::selection {
  background: var(--mango-primary);
  color: #ffffff;
}

/* ---------- 头部导航 ---------- */
.site-header {
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 20px;
  max-width: var(--container-max);
  margin: 0 auto;
  gap: 20px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--mango-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.logo svg {
  width: 42px;
  height: 42px;
  filter: drop-shadow(0 2px 8px rgba(230, 57, 70, 0.3));
  transition: transform 0.3s ease;
}

.logo:hover svg {
  transform: rotate(10deg) scale(1.05);
}

.nav-menu {
  display: flex;
  gap: 28px;
  align-items: center;
  margin: 0 auto;
}

.nav-menu a {
  font-weight: 500;
  color: var(--text);
  position: relative;
  padding: 4px 0;
  transition: color 0.3s ease;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--mango-primary);
  transition: width 0.3s ease;
}

.nav-menu a:hover {
  color: var(--mango-primary);
}

.nav-menu a:hover::after {
  width: 100%;
}

.search-box {
  display: flex;
  border: 2px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
  background: var(--surface);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  flex-shrink: 0;
}

.search-box:focus-within {
  border-color: var(--mango-primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

.search-box input {
  border: none;
  padding: 8px 16px;
  outline: none;
  width: 200px;
  background: transparent;
  color: var(--text);
  font-size: 0.95rem;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  background: var(--mango-primary);
  border: none;
  color: #ffffff;
  padding: 0 18px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-box button:hover {
  background: var(--mango-primary-dark);
}

.hamburger {
  display: none;
  font-size: 28px;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--text);
  padding: 4px;
  transition: color 0.3s ease;
  flex-shrink: 0;
}

.hamburger:hover {
  color: var(--mango-primary);
}

/* 移动端导航 */
.mobile-nav {
  display: none;
  background: var(--surface);
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  padding: 20px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-weight: 500;
  transition: color 0.3s ease, padding-left 0.3s ease;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  color: var(--mango-primary);
  padding-left: 8px;
}

.mobile-nav.open {
  display: block;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 15px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: transparent;
}

.breadcrumb a {
  color: var(--mango-primary);
  font-weight: 500;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 轮播 Banner ---------- */
.banner {
  background: linear-gradient(135deg, #2b1a12 0%, #4a2c2a 50%, #6b3a3a 100%);
  color: #ffffff;
  padding: 40px 0 60px;
  border-radius: 0 0 50px 50px;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(230, 57, 70, 0.3) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 159, 28, 0.2) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

.banner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.banner-text h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 15px;
  line-height: 1.2;
  background: linear-gradient(135deg, #ffffff 0%, #ffd6d6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.8s ease;
}

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

.banner-text p {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 25px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.banner-actions {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
  display: inline-block;
  background: var(--mango-primary);
  color: #ffffff;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

.btn:hover {
  background: var(--mango-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.4);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  border: 2px solid #ffffff;
  box-shadow: none;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--mango-primary);
  color: #ffffff;
}

.banner-stats {
  display: flex;
  gap: 40px;
  margin-top: 35px;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.stat-item {
  text-align: center;
}

.stat-item .num {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff, #ffd6d6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}

.stat-item p {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 4px;
}

.banner-visual {
  text-align: center;
  animation: fadeInRight 1s ease 0.3s both;
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.banner-visual svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 70px 0;
  position: relative;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 40px;
  position: relative;
  display: inline-block;
  color: var(--text);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--mango-primary), var(--mango-accent));
  margin-top: 10px;
  border-radius: 2px;
  transition: width 0.3s ease;
}

.section-title:hover::after {
  width: 100px;
}

/* 网格系统 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

/* 卡片 */
.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--mango-primary), var(--mango-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

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

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--text);
}

.card p {
  color: var(--text-muted);
  line-height: 1.7;
}

/* 数字动画 */
.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--mango-primary);
  display: inline-block;
}

/* FAQ */
.faq-item {
  background: var(--surface);
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
  padding: 20px 25px;
  border: 1px solid var(--border);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
  border-color: var(--mango-primary);
  box-shadow: 0 4px 15px rgba(230, 57, 70, 0.08);
}

details summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.3s ease;
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--mango-primary);
  transition: transform 0.3s ease;
}

details[open] summary::after {
  transform: rotate(45deg);
}

details p {
  margin-top: 12px;
  color: var(--text-muted);
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* HowTo */
.howto-step {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.step-num {
  background: linear-gradient(135deg, var(--mango-primary), var(--mango-primary-dark));
  color: #ffffff;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(230, 57, 70, 0.3);
}

/* 文章 */
.article-card {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  transition: padding-left 0.3s ease;
}

.article-card:hover {
  padding-left: 10px;
}

.article-card .date {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 6px;
}

.article-card h4 {
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 8px;
  transition: color 0.3s ease;
}

.article-card h4:hover {
  color: var(--mango-primary);
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.read-more {
  color: var(--mango-primary);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.read-more:hover {
  color: var(--mango-primary-dark);
  text-decoration: underline;
}

/* ---------- 品牌介绍 ---------- */
#brand .grid-2 {
  gap: 50px;
}

#brand strong {
  color: var(--mango-primary);
  font-weight: 700;
}

#brand h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  color: var(--text);
}

#brand p {
  margin-bottom: 15px;
  color: var(--text-muted);
}

/* ---------- 解决方案 ---------- */
#solutions {
  background: linear-gradient(135deg, var(--bg) 0%, var(--border) 100%);
}

/* ---------- 案例 ---------- */
#cases .card {
  position: relative;
}

#cases .card::after {
  content: '★★★★★';
  position: absolute;
  bottom: 20px;
  right: 25px;
  color: var(--mango-accent);
  font-size: 0.9rem;
  letter-spacing: 2px;
}

/* ---------- 新闻资讯 ---------- */
#news .grid-2 {
  gap: 50px;
}

#news h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: var(--text);
  position: relative;
  padding-bottom: 10px;
}

#news h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--mango-primary);
  border-radius: 2px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: #1a1a1a;
  color: #aaaaaa;
  padding: 60px 0 20px;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--mango-primary), var(--mango-accent), var(--mango-primary));
  background-size: 200% 100%;
  animation: gradientMove 3s linear infinite;
}

@keyframes gradientMove {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 200% 50%;
  }
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.site-footer h4 {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.site-footer a {
  color: #cccccc;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  border-top: 1px solid #333333;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  margin: 0 10px;
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: var(--mango-primary);
  color: #ffffff;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
  z-index: 999;
}

.to-top.show {
  opacity: 1;
  visibility: visible;
}

.to-top:hover {
  background: var(--mango-primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.4);
}

/* ---------- 懒加载与动画 ---------- */
.lazy {
  opacity: 0;
  transition: opacity 0.5s ease;
}

.lazy.loaded {
  opacity: 1;
}

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

.fade-up.visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式设计 ---------- */
/* 平板 */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .banner-text h1 {
    font-size: 2.4rem;
  }

  .banner-stats {
    gap: 25px;
  }

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

/* 手机 */
@media (max-width: 768px) {
  .nav-menu,
  .search-box {
    display: none;
  }

  .hamburger {
    display: block;
  }

  .header-inner {
    padding: 10px 15px;
  }

  .mobile-nav.open {
    display: block;
  }

  .banner {
    padding: 30px 0 40px;
    border-radius: 0 0 30px 30px;
  }

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

  .banner-text h1 {
    font-size: 1.8rem;
  }

  .banner-text p {
    font-size: 1rem;
  }

  .banner-stats {
    gap: 20px;
    margin-top: 25px;
  }

  .stat-item .num {
    font-size: 1.8rem;
  }

  .banner-visual svg {
    width: 100%;
    max-width: 300px;
  }

  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.6rem;
    margin-bottom: 30px;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .card {
    padding: 20px;
  }

  .banner-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

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

  .to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 18px;
  }

  .search-box {
    display: none;
  }

  .breadcrumb {
    font-size: 0.8rem;
    padding: 10px 0;
  }

  .howto-step {
    flex-direction: column;
    gap: 10px;
  }

  details summary {
    font-size: 1rem;
  }

  #news .grid-2 {
    gap: 30px;
  }

  #brand .grid-2 {
    gap: 30px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .logo {
    font-size: 1.5rem;
  }

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

  .banner-text h1 {
    font-size: 1.5rem;
  }

  .banner-stats {
    flex-wrap: wrap;
    gap: 15px;
  }

  .stat-item {
    flex: 1;
    min-width: 80px;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .card h3 {
    font-size: 1.1rem;
  }

  .footer-grid {
    gap: 20px;
  }
}

/* ---------- 暗色模式优化 ---------- */
@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(30, 30, 30, 0.9);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  }

  .banner {
    background: linear-gradient(135deg, #1a1a1a 0%, #2a1a1a 50%, #3a2a2a 100%);
  }

  .banner-text h1 {
    background: linear-gradient(135deg, #ffffff 0%, #ffd6d6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .card {
    background: var(--surface-dark);
    border-color: #333333;
  }

  .faq-item {
    background: var(--surface-dark);
    border-color: #333333;
  }

  .article-card {
    border-color: #333333;
  }

  .search-box {
    border-color: #444444;
  }

  .search-box input {
    color: #ffffff;
  }

  .search-box input::placeholder {
    color: #888888;
  }

  .site-footer {
    background: #0d0d0d;
  }

  .footer-bottom {
    border-color: #333333;
  }

  #solutions {
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
  }

  .mobile-nav {
    background: var(--surface-dark);
    border-color: #333333;
  }

  .mobile-nav a {
    border-color: #333333;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .site-header,
  .banner,
  .to-top,
  .site-footer,
  .breadcrumb {
    display: none !important;
  }

  .section {
    padding: 20px 0;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ---------- 无障碍优化 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 焦点可见性 */
:focus-visible {
  outline: 3px solid var(--mango-primary);
  outline-offset: 2px;
}

/* 高对比度模式 */
@media (forced-colors: active) {
  .btn,
  .step-num,
  .to-top {
    border: 2px solid CanvasText;
  }
}
```