:root {
    --bg-dark: #0f1115;
    --bg-card: #1a1d24;
    --text-main: #f2f2f2;
    --text-muted: #a0a5b1;
    --accent: #ff4d4f;
    --accent-hover: #ff7875;
    --border: #2c313c;
  }

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

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

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

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 20px;
    background: rgba(15, 17, 21, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
  }

  .logo-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo-wrapper img {
    height: 32px;
    width: auto;
    border-radius: 6px;
  }

  .logo-wrapper span {
    font-size: 20px;
    font-weight: bold;
    color: #fff;
  }

  .btn-download {
    background: var(--accent);
    color: #fff;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    transition: background 0.3s;
  }

  .btn-download:hover {
    background: var(--accent-hover);
  }

  /* Hero Carousel */
  .hero-section {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 500px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 60px;
  }

  .carousel-track {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.5s ease-in-out;
  }

  .carousel-slide {
    min-width: 100%;
    height: 100%;
    position: relative;
  }

  .carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
  }

  .hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 90%;
    max-width: 800px;
    background: rgba(0, 0, 0, 0.6);
    padding: 30px 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .hero-content h1 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #fff;
  }

  .hero-content p {
    font-size: 16px;
    color: #ddd;
    margin-bottom: 20px;
  }

  /* Sections */
  .content-section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .section-title {
    font-size: 24px;
    margin-bottom: 10px;
    text-align: center;
    color: #fff;
  }

  .section-desc {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 40px;
    font-size: 15px;
  }

  /* Intro Section */
  .intro-wrap {
    display: flex;
    flex-direction: column;
    gap: 30px;
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
  }

  .intro-img {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: cover;
  }

  .intro-text {
    padding: 30px;
  }

  .intro-text h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #fff;
  }

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

  /* Grid Cards */
  .grid-cards {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 20px;
  }

  .card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.3s;
  }

  .card:hover {
    transform: translateY(-5px);
  }

  .card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    object-position: top;
  }

  .card-body {
    padding: 20px;
  }

  .card-body h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #fff;
  }

  .card-body p {
    font-size: 14px;
    color: var(--text-muted);
  }

  /* Steps Section */
  .steps-wrap {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .step-item {
    display: flex;
    gap: 15px;
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border);
  }

  .step-num {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
  }

  .step-info h3 {
    font-size: 18px;
    margin-bottom: 5px;
    color: #fff;
  }

  .step-info p {
    font-size: 14px;
    color: var(--text-muted);
  }

  /* CTA Section */
  .cta-section {
    text-align: center;
    padding: 80px 20px;
    background: linear-gradient(to bottom, var(--bg-dark), #1a0000);
  }

  .cta-section h2 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #fff;
  }

  .cta-section p {
    color: var(--text-muted);
    margin-bottom: 30px;
  }

  .cta-btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 12px 40px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: bold;
    transition: background 0.3s;
  }

  .cta-btn:hover {
    background: var(--accent-hover);
  }

  /* Footer */
  .site-footer {
    background: #0a0b0e;
    padding: 40px 20px;
    text-align: center;
    font-size: 13px;
    color: #666;
    border-top: 1px solid var(--border);
  }

  .site-footer p {
    margin-bottom: 10px;
  }

  .site-footer a {
    color: #666;
    transition: color 0.3s;
  }

  .site-footer a:hover {
    color: var(--text-muted);
  }

  .update-time {
    font-size: 12px;
    color: #555;
    display: inline-block;
    margin-top: 5px;
  }

  /* Responsive */
  @media (min-width: 768px) {
    .hero-content h1 { font-size: 36px; }
    .hero-content p { font-size: 18px; }
    .grid-cards { grid-template-columns: repeat(2, 1fr); }
    .intro-wrap { flex-direction: row; align-items: center; }
    .intro-img { width: 50%; max-height: none; height: 100%; }
    .intro-text { width: 50%; padding: 40px; }
    .steps-wrap { flex-direction: row; flex-wrap: wrap; }
    .step-item { flex: 1 1 calc(50% - 20px); }
  }

  @media (min-width: 1024px) {
    .hero-content h1 { font-size: 48px; }
    .grid-cards { grid-template-columns: repeat(3, 1fr); }
    .steps-wrap { flex-wrap: nowrap; }
    .step-item { flex: 1; flex-direction: column; text-align: center; gap: 10px; }
    .step-num { margin: 0 auto; }
  }