@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

:root {
  /* 全新高级配色方案，带丰富渐变 */
  --clr-main: #ff8f00;
  --clr-main-light: #ffb74d;
  --clr-main-dark: #c56000;
  --clr-accent: #9c27b0;
  --clr-accent-light: #d05ce3;
  --clr-accent-dark: #6a0080;
  --clr-tertiary: #00bcd4;
  
  /* 背景色 */
  --clr-bg: #fef8f0;
  --clr-bg-alt: #f3e5f5;
  --clr-bg-card: #ffffff;
  
  /* 文字色 */
  --clr-text: #212121;
  --clr-text-light: #757575;
  --clr-light: #ffffff;
  
  /* 阴影 */
  --clr-shadow: 0 8px 30px rgba(255, 179, 71, 0.15);
  --card-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  --hover-shadow: 0 15px 35px rgba(156, 39, 176, 0.15);
  
  /* 圆角 */
  --radius: 1.5em;
  --radius-sm: 0.85em;
  --radius-btn: 50px;
  
  /* 动效 */
  --transition: 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
  
  /* 尺寸 */
  --container-width: 1200px;
  --section-spacing: 5rem;
  --card-padding: 2rem;
}

body {
  font-family: 'Poppins', sans-serif;
  background: var(--clr-bg);
  color: var(--clr-text);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}
/* 通用样式 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
  box-sizing: border-box;
}

section {
  padding: 4rem 0;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--clr-accent);
  text-align: center;
  margin-bottom: 1rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-main), var(--clr-accent));
  margin: 0.7rem auto 1.5rem;
  border-radius: 4px;
}

.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: var(--clr-text-light);
  max-width: 800px;
  margin: 0 auto 3rem;
}

.title-accent {
  color: var(--clr-main);
}

/* 头部和导航 */
.header {
  background: var(--clr-bg-card);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all var(--transition);
  border-bottom: 1px solid rgba(255, 143, 0, 0.1);
}

.header-flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--clr-accent);
  text-decoration: none;
  transition: transform var(--transition);
}

.logo:hover {
  transform: translateY(-2px);
}

.logo-svg {
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--clr-main-light), var(--clr-accent-light));
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(255, 143, 0, 0.25);
  padding: 4px;
}

.logo-text {
  letter-spacing: 0.02em;
  background: linear-gradient(to right, var(--clr-main), var(--clr-accent));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
}

.nav-list {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: var(--clr-text);
  font-weight: 500;
  text-decoration: none;
  position: relative;
  padding: 0.5rem 0.2rem;
  transition: color var(--transition);
}

.nav-list a:hover {
  color: var(--clr-accent);
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(to right, var(--clr-main), var(--clr-accent));
  transition: width var(--transition);
}

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

/* Hero区域 */
.hero {
  background: linear-gradient(135deg, var(--clr-bg) 60%, var(--clr-bg-alt) 100%);
  padding: 6rem 0 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--clr-main-light) 0%, var(--clr-accent-light) 100%);
  opacity: 0.05;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--clr-accent-light) 0%, var(--clr-main-light) 100%);
  opacity: 0.05;
  z-index: 0;
}

.hero-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 3rem;
  position: relative;
  z-index: 1;
}

.hero-content {
  flex: 1 1 520px;
  min-width: 300px;
}

.hero-content h1 {
  font-size: 3.2rem;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  font-weight: 700;
  background: linear-gradient(to right, var(--clr-accent), var(--clr-main-dark));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--clr-text-light);
  margin-bottom: 2.5rem;
  max-width: 580px;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.5rem;
  border-radius: var(--radius-btn);
  background: linear-gradient(135deg, var(--clr-main) 0%, var(--clr-accent) 100%);
  color: #fff;
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  box-shadow: 0 10px 20px rgba(255, 143, 0, 0.2);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--clr-accent) 0%, var(--clr-main) 100%);
  opacity: 0;
  z-index: -1;
  transition: opacity var(--transition);
}

.btn-main:hover {
  box-shadow: 0 15px 30px rgba(156, 39, 176, 0.25);
  transform: translateY(-3px);
}

.btn-main:hover::before {
  opacity: 1;
}

.btn-lg {
  font-size: 1.15rem;
  padding: 1.2rem 3rem;
  margin-top: 2rem;
}

.hero-visual {
  flex: 0 0 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-visual svg {
  filter: drop-shadow(0 10px 30px rgba(255, 143, 0, 0.2));
  transform: scale(1.4);
  transition: transform 0.5s ease-out;
}

.hero-visual:hover svg {
  transform: scale(1.5) rotate(5deg);
}

/* 功能特点区域 */
.features {
  background: linear-gradient(to bottom, var(--clr-bg) 0%, var(--clr-bg-alt) 100%);
  padding: 5rem 0;
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 3px;
  top: 0;
  left: 0;
  background: linear-gradient(90deg, transparent, var(--clr-main-light), transparent);
}

/* How it works 使用流程 */
.how-it-works {
  padding: 6rem 0;
  background: var(--clr-bg);
  position: relative;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 3rem;
  margin-top: 3rem;
  position: relative;
}

.steps-container::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 10%;
  width: 80%;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-main-light), var(--clr-accent-light));
  z-index: 1;
  opacity: 0.3;
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
}

.step-number {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--clr-main), var(--clr-accent));
  color: white;
  box-shadow: 0 10px 20px rgba(255, 143, 0, 0.2);
}

.step-svg {
  margin: 1.5rem 0;
  transition: transform 0.5s ease;
  filter: drop-shadow(0 10px 15px rgba(156, 39, 176, 0.1));
}

.step:hover .step-svg {
  transform: translateY(-8px);
}

.step h3 {
  color: var(--clr-accent);
  font-size: 1.4rem;
  margin: 1rem 0;
  font-weight: 600;
}

.step p {
  color: var(--clr-text-light);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 300px;
  margin: 0 auto;
}

/* FAQ 部分 */
.faq {
  background: linear-gradient(to top, var(--clr-bg) 0%, var(--clr-bg-alt) 100%);
  padding: 6rem 0;
  position: relative;
}

.faq-container {
  max-width: 800px;
  margin: 3rem auto 0;
}

.accordion {
  list-style: none;
  padding: 0;
  margin: 0;
}

.accordion-item {
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  background: var(--clr-bg-card);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: all var(--transition);
}

.accordion-item:hover {
  box-shadow: var(--hover-shadow);
}

.accordion-header {
  padding: 1.5rem 2rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--clr-accent);
  position: relative;
  transition: all var(--transition);
}

.accordion-header::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--clr-main);
  transition: transform 0.3s ease;
}

.accordion-header.active {
  color: var(--clr-main);
  background-color: rgba(255, 143, 0, 0.03);
}

.accordion-header.active::after {
  content: '-';
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  padding: 0 2rem;
  line-height: 1.6;
  color: var(--clr-text-light);
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.accordion-content.active {
  max-height: 500px;
  padding: 0 2rem 1.5rem;
}

/* 为什么选择我们 */
.why-us {
  padding: 6rem 0;
  background: var(--clr-bg);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.benefit-card {
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  background: var(--clr-bg-card);
  box-shadow: var(--card-shadow);
  text-align: center;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hover-shadow);
}

.benefit-icon {
  width: 70px;
  height: 70px;
  margin-bottom: 1.5rem;
  color: var(--clr-accent);
  transition: transform 0.5s ease;
}

.benefit-card:hover .benefit-icon {
  transform: rotate(10deg);
}

.benefit-card h3 {
  color: var(--clr-accent);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.benefit-card p {
  color: var(--clr-text-light);
  line-height: 1.6;
}

/* 用户评价 */
.testimonials {
  background: linear-gradient(to bottom, var(--clr-bg) 0%, var(--clr-bg-alt) 100%);
  padding: 6rem 0;
  position: relative;
  overflow: hidden;
}

.testimonials::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--clr-main-light) 0%, transparent 60%);
  opacity: 0.05;
  border-radius: 50%;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.testimonial-card {
  background: var(--clr-bg-card);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--card-shadow);
  position: relative;
  z-index: 1;
  transition: all var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hover-shadow);
}

.testimonial-card::before {
  content: '\201C';
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  font-size: 5rem;
  color: var(--clr-main-light);
  opacity: 0.2;
  z-index: -1;
  line-height: 1;
}

.quote {
  font-style: italic;
  margin-bottom: 1.5rem;
  color: var(--clr-text);
  line-height: 1.6;
}

.author {
  display: flex;
  align-items: center;
  margin-top: 2rem;
}

.author-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-main-light), var(--clr-accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 1rem;
}

.author-avatar span {
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
}

.author-info h4 {
  font-weight: 600;
  color: var(--clr-accent);
  margin-bottom: 0.2rem;
}

.author-info p {
  color: var(--clr-text-light);
  font-size: 0.9rem;
}

/* CTA 区域 */
.cta {
  background: linear-gradient(135deg, var(--clr-main-light) 0%, var(--clr-accent-light) 100%);
  padding: 4.5rem 0;
  position: relative;
  margin: 0;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.2;
}

.cta-inner {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

.cta h2 {
  color: white;
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.cta p {
  margin-bottom: 2.5rem;
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.btn-cta {
  background: white;
  color: var(--clr-accent);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
  font-weight: 600;
  border: 2px solid transparent;
}

.btn-cta:hover {
  background: transparent;
  color: white;
  border-color: white;
}

/* 页脚 */
.footer {
  background: var(--clr-text);
  color: #f5f5f5;
  padding: 4rem 0 2rem;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--clr-main), var(--clr-accent));
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h3 {
  color: white;
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.8rem;
}

.footer-section h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-main), var(--clr-accent));
}

.footer-about p {
  margin-bottom: 1.5rem;
  line-height: 1.6;
  color: #bdbdbd;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 1rem;
}

.footer-links a {
  color: #bdbdbd;
  text-decoration: none;
  transition: color var(--transition);
  display: block;
  position: relative;
  padding-left: 1.2rem;
}

.footer-links a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--clr-main);
  border-radius: 50%;
  transition: all var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-links a:hover::before {
  background: var(--clr-accent);
  transform: translateY(-50%) scale(1.5);
}

.footer-contact p {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  color: #bdbdbd;
}

.contact-icon {
  margin-right: 1rem;
  width: 20px;
  height: 20px;
  color: var(--clr-main-light);
}

.footer-brand {
  display: flex;
  align-items: center;
  margin-bottom: 1.5rem;
}

.footer-logo-svg {
  width: 40px;
  height: 40px;
  margin-right: 1rem;
}

.footer-copyright {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #9e9e9e;
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
  :root {
    --container-width: 95%;
  }
  
  .hero-content h1 {
    font-size: 2.8rem;
  }
  
  .section-title {
    font-size: 2.2rem;
  }
  
  .steps-container::before {
    display: none;
  }
}

@media (max-width: 768px) {
  section {
    padding: 3rem 0;
  }
  
  .hero {
    padding: 4rem 0 3rem;
  }
  
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content p {
    font-size: 1.1rem;
  }
  
  .btn-lg {
    font-size: 1rem;
    padding: 1rem 2.5rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .testimonials-grid, 
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-card {
    max-width: 100%;
  }
  
  .cta h2 {
    font-size: 2rem;
  }
  
  .cta p {
    font-size: 1.1rem;
  }
}

@media (max-width: 576px) {
  .header-flex {
    height: auto;
    padding: 1rem 0;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  .logo-svg {
    width: 2rem;
    height: 2rem;
  }
  
  .nav-list {
    gap: 1.5rem;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  .btn {
    padding: 0.8rem 2rem;
    font-size: 0.95rem;
  }
  
  .btn-lg {
    padding: 0.9rem 2.2rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .section-subtitle {
    font-size: 1rem;
  }
  
  .accordion-header {
    padding: 1.2rem 1.5rem;
    font-size: 1rem;
  }
  
  .accordion-content.active {
    padding: 0 1.5rem 1.2rem;
  }
  
  .footer {
    padding: 3rem 0 1.5rem;
  }
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--clr-bg-card);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--clr-main), var(--clr-accent));
  z-index: 1;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}

.feature-card:hover {
  box-shadow: var(--hover-shadow);
  transform: translateY(-8px);
}

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

.feature-svg {
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--clr-bg), var(--clr-bg-alt));
  padding: 1.5rem;
  border-radius: 50%;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition);
}

.feature-card:hover .feature-svg {
  transform: rotate(5deg) scale(1.05);
}

.feature-card svg {
  width: 48px;
  height: 48px;
}

.feature-card h3 {
  color: var(--clr-accent);
  font-size: 1.4rem;
  margin: 0.8rem 0;
  font-weight: 600;
  position: relative;
  padding-bottom: 0.8rem;
}

.feature-card h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-main), var(--clr-accent));
}

.feature-card p {
  color: var(--clr-text-light);
  font-size: 1rem;
  line-height: 1.6;
  margin-top: 1rem;
  flex-grow: 1;
}

.cta {
  background: linear-gradient(90deg, #ffb347 60%, #8e44ad 100%);
  color: #fff;
  text-align: center;
  padding: 2.7em 0 2.5em 0;
}
.cta-box h2 {
  font-size: 2em;
  margin-bottom: 1em;
  font-weight: 700;
}

.footer {
  background: #fff3e0;
  padding: 1.8em 0 0.7em 0;
  border-top: 4px solid #ffb347;
}
.footer-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 2em;
  align-items: flex-start;
  justify-content: space-between;
}
.footer-brand {
  flex: 1 1 180px;
}
.footer-logo-svg {
  margin-bottom: 0.5em;
}
.footer-logo-text {
  color: var(--clr-accent);
  font-weight: 700;
  font-size: 1.1em;
  margin-left: 0.1em;
}
.footer-brand p {
  color: #7c5a2b;
  font-size: 1em;
  margin-top: 0.7em;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  min-width: 120px;
}
.footer-links a {
  color: var(--clr-accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05em;
  border-radius: var(--radius-sm);
  padding: 0.3em 0.8em;
  transition: background var(--transition);
}
.footer-links a:hover {
  background: #f9e4ff;
}
.footer-favicon {
  text-align: center;
  margin-top: 0.5em;
}

/* Responsive */
@media (max-width: 900px) {
  .container { max-width: 98vw; }
  .footer-flex, .features-grid, .hero-grid {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-visual { justify-content: flex-start; }
}
@media (max-width: 600px) {
  .header-flex { flex-direction: column; gap: 1em; }
  .nav-list { gap: 1em; }
  .hero { padding: 2em 0 1.2em 0; }
  .features, .cta { padding: 1.2em 0; }
  .feature-card { padding: 1.2em 0.7em; }
  .cta-box h2 { font-size: 1.2em; }
  .btn, .btn-lg { font-size: 1em; padding: 0.7em 1.3em; }
}