:root {
    --cuke-deep: #2d5a27;
    --cuke-main: #6ab04c;
    --cuke-light: #d4edc9;
    --cuke-pale: #f4faf0;
    --cuke-accent: #badc58;
    --text-dark: #1e3318;
    --text-soft: #4a6341;
    --white: #ffffff;
    --shadow: 0 8px 20px rgba(45, 90, 39, 0.08);
    --radius: 20px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--cuke-pale);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
  }
  img { max-width: 100%; display: block; }
  a { text-decoration: none; color: inherit; }
  ul { list-style: none; }

  /* Header */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--cuke-light);
  }
  .header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--cuke-deep);
    flex-shrink: 0;
  }
  .brand img { height: 32px; width: auto; border-radius: 8px; }
  .main-nav { display: none; }
  .main-nav ul { display: flex; gap: 24px; font-size: 0.95rem; font-weight: 500; color: var(--text-soft); }
  .main-nav a { position: relative; padding: 4px 0; transition: color 0.3s; }
  .main-nav a:hover { color: var(--cuke-main); }
  .main-nav a::after {
    content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
    background: var(--cuke-main); transition: width 0.3s;
  }
  .main-nav a:hover::after { width: 100%; }
  .header-actions { display: flex; gap: 10px; }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }
  .btn-cuke {
    background: linear-gradient(135deg, var(--cuke-main), var(--cuke-deep));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(106, 176, 76, 0.3);
  }
  .btn-cuke:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(106, 176, 76, 0.45);
  }
  .btn-cuke::before {
    content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
  }
  .btn-cuke:hover::before { left: 100%; }
  .btn-outline {
    background: transparent;
    color: var(--cuke-deep);
    border: 2px solid var(--cuke-main);
  }
  .btn-outline:hover { background: var(--cuke-light); }

  /* Hero */
  .hero {
    padding: 60px 20px 80px;
    background: linear-gradient(180deg, var(--cuke-pale) 0%, #ffffff 100%);
    position: relative;
    overflow: hidden;
  }
  .hero::before {
    content: ''; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px;
    background: radial-gradient(circle, var(--cuke-light) 0%, transparent 70%);
    border-radius: 50%; opacity: 0.6; z-index: 0;
  }
  .hero-inner {
    max-width: 1200px; margin: 0 auto; position: relative; z-index: 1;
    display: flex; flex-direction: column; align-items: center; text-align: center; gap: 30px;
  }
  .hero-text { max-width: 800px; }
  .hero-tag {
    display: inline-block; background: var(--cuke-light); color: var(--cuke-deep);
    padding: 6px 16px; border-radius: 20px; font-size: 0.85rem; font-weight: 600; margin-bottom: 20px;
  }
  .hero h1 {
    font-size: 2.2rem; line-height: 1.3; color: var(--cuke-deep); margin-bottom: 20px; letter-spacing: -0.5px;
  }
  .hero h1 span { color: var(--cuke-main); }
  .hero-desc { font-size: 1.1rem; color: var(--text-soft); margin-bottom: 30px; max-width: 600px; margin-left: auto; margin-right: auto; }
  .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
  .download-note { font-size: 0.85rem; color: var(--text-soft); margin-top: 12px; opacity: 0.8; }

  .hero-visual {
    width: 100%; max-width: 500px; position: relative; margin-top: 20px;
  }
  .hero-visual img {
    border-radius: var(--radius); box-shadow: var(--shadow); width: 100%; height: auto;
  }

  /* Section General */
  section { padding: 60px 20px; }
  .section-inner { max-width: 1200px; margin: 0 auto; }
  .section-header { text-align: center; margin-bottom: 40px; }
  .section-header h2 {
    font-size: 1.8rem; color: var(--cuke-deep); margin-bottom: 10px;
  }
  .section-header p { color: var(--text-soft); font-size: 1rem; }

  /* Categories */
  .category-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 16px;
  }
  .category-card {
    background: var(--white); border-radius: 16px; padding: 24px 16px; text-align: center;
    box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s; border: 1px solid transparent;
  }
  .category-card:hover { transform: translateY(-5px); box-shadow: 0 12px 25px rgba(106, 176, 76, 0.15); border-color: var(--cuke-light); }
  .category-icon { font-size: 2rem; margin-bottom: 12px; display: block; }
  .category-card h3 { font-size: 1.1rem; color: var(--cuke-deep); margin-bottom: 8px; }
  .category-card p { font-size: 0.85rem; color: var(--text-soft); }

  /* Today Update Highlights */
  .update-scroller {
    display: flex; gap: 20px; overflow-x: auto; padding-bottom: 20px; scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }
  .update-scroller::-webkit-scrollbar { height: 6px; }
  .update-scroller::-webkit-scrollbar-track { background: var(--cuke-light); border-radius: 10px; }
  .update-scroller::-webkit-scrollbar-thumb { background: var(--cuke-main); border-radius: 10px; }
  .update-item {
    flex: 0 0 200px; scroll-snap-align: start; border-radius: 16px; overflow: hidden;
    box-shadow: var(--shadow); position: relative; background: var(--white);
  }
  .update-item img { width: 100%; height: 280px; object-fit: cover; transition: transform 0.5s; }
  .update-item:hover img { transform: scale(1.05); }
  .update-info { padding: 12px; position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(to top, rgba(0,0,0,0.8), transparent); color: var(--white); }
  .update-info h3 { font-size: 1rem; font-weight: 600; }

  /* Calendar */
  .calendar-wrap { display: flex; flex-direction: column; gap: 20px; }
  .calendar-days { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
  .day-btn {
    background: var(--white); border: 2px solid var(--cuke-light); border-radius: 12px;
    padding: 10px 0; text-align: center; font-weight: 600; color: var(--text-soft);
    cursor: pointer; transition: all 0.2s;
  }
  .day-btn.active { background: var(--cuke-main); color: var(--white); border-color: var(--cuke-main); }
  .calendar-list { background: var(--white); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
  .cal-item { display: flex; align-items: center; gap: 16px; padding: 12px 0; border-bottom: 1px dashed var(--cuke-light); }
  .cal-item:last-child { border-bottom: none; }
  .cal-time { font-size: 0.85rem; font-weight: 700; color: var(--cuke-main); min-width: 50px; }
  .cal-title { font-size: 0.95rem; font-weight: 500; color: var(--text-dark); }

  /* AI Flow */
  .flow-steps { display: grid; grid-template-columns: 1fr; gap: 20px; }
  .flow-step {
    display: flex; gap: 16px; background: var(--white); padding: 20px; border-radius: var(--radius);
    box-shadow: var(--shadow);
  }
  .step-num {
    width: 40px; height: 40px; border-radius: 50%; background: var(--cuke-light); color: var(--cuke-deep);
    display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; flex-shrink: 0;
  }
  .step-content h3 { font-size: 1.1rem; color: var(--cuke-deep); margin-bottom: 6px; }
  .step-content p { font-size: 0.9rem; color: var(--text-soft); }

  /* Poster Wall */
  .poster-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
  }
  .poster-card { border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); position: relative; background: var(--white); }
  .poster-card img { width: 100%; height: 240px; object-fit: cover; }
  .poster-label { padding: 10px; font-size: 0.9rem; font-weight: 600; text-align: center; color: var(--cuke-deep); }

  /* Rotating Card */
  .rotate-section {
    display: flex; flex-direction: column; align-items: center; text-align: center; gap: 20px;
  }
  .rotate-card {
    width: 200px; height: 280px; position: relative; perspective: 1000px;
  }
  .rotate-card img {
    width: 100%; height: 100%; object-fit: cover; border-radius: 16px; box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    animation: floatRotate 6s ease-in-out infinite;
  }
  @keyframes floatRotate {
    0% { transform: rotateY(0deg) translateY(0); }
    50% { transform: rotateY(10deg) translateY(-10px); }
    100% { transform: rotateY(0deg) translateY(0); }
  }

  /* FAQ */
  .faq-list { display: flex; flex-direction: column; gap: 12px; max-width: 800px; margin: 0 auto; }
  .faq-item { background: var(--white); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
  .faq-question {
    padding: 18px 20px; font-weight: 600; color: var(--cuke-deep); cursor: pointer;
    display: flex; justify-content: space-between; align-items: center; background: none; border: none; width: 100%; text-align: left; font-size: 1rem;
  }
  .faq-question::after { content: '+'; font-size: 1.4rem; color: var(--cuke-main); transition: transform 0.3s; }
  .faq-item.open .faq-question::after { transform: rotate(45deg); }
  .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease-out; padding: 0 20px; color: var(--text-soft); font-size: 0.95rem; }
  .faq-item.open .faq-answer { max-height: 200px; padding-bottom: 18px; }

  /* Tutorial & Cert */
  .two-col { display: grid; grid-template-columns: 1fr; gap: 30px; }
  .tutorial-box, .cert-box { background: var(--white); padding: 24px; border-radius: var(--radius); box-shadow: var(--shadow); }
  .tutorial-box h3, .cert-box h3 { color: var(--cuke-deep); margin-bottom: 16px; font-size: 1.2rem; }
  .tutorial-steps { list-style: decimal; padding-left: 20px; color: var(--text-soft); }
  .tutorial-steps li { margin-bottom: 10px; padding-left: 4px; }
  .cert-gallery { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
  .cert-gallery img { width: 120px; height: 160px; object-fit: cover; border-radius: 8px; box-shadow: 0 4px 10px rgba(0,0,0,0.1); }

  /* Reviews */
  .review-scroller { display: flex; gap: 16px; overflow-x: auto; padding-bottom: 20px; }
  .review-scroller::-webkit-scrollbar { display: none; }
  .review-card { min-width: 280px; background: var(--white); padding: 16px; border-radius: 16px; box-shadow: var(--shadow); border: 1px solid var(--cuke-light); }
  .review-user { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
  .review-avatar { width: 36px; height: 36px; background: var(--cuke-light); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; color: var(--cuke-deep); }
  .review-name { font-weight: 600; font-size: 0.9rem; color: var(--text-dark); }
  .review-text { font-size: 0.9rem; color: var(--text-soft); }

  /* Ranking */
  .rank-grid { display: flex; flex-direction: column; gap: 12px; }
  .rank-item { display: flex; align-items: center; gap: 16px; background: var(--white); padding: 12px 16px; border-radius: 16px; box-shadow: var(--shadow); }
  .rank-num { font-size: 1.2rem; font-weight: 800; color: var(--cuke-main); min-width: 30px; }
  .rank-item:nth-child(1) .rank-num { color: #f39c12; }
  .rank-item:nth-child(2) .rank-num { color: #bdc3c7; }
  .rank-item:nth-child(3) .rank-num { color: #e67e22; }
  .rank-img { width: 50px; height: 70px; object-fit: cover; border-radius: 8px; }
  .rank-info h4 { font-size: 0.95rem; color: var(--text-dark); }
  .rank-info p { font-size: 0.8rem; color: var(--text-soft); }

  /* Footer */
  .site-footer {
    background: #edf5e9; padding: 40px 20px 20px; border-top: 1px solid var(--cuke-light);
    color: #7a8f74; font-size: 0.85rem;
  }
  .footer-inner { max-width: 1200px; margin: 0 auto; text-align: center; display: flex; flex-direction: column; gap: 12px; }
  .footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; color: var(--text-soft); }
  .footer-links a:hover { color: var(--cuke-main); }
  .footer-disclaimer { font-size: 0.8rem; margin-bottom: 8px; }
  .beian a { color: #7a8f74; text-decoration: underline; }
  .beian a:hover { color: var(--cuke-deep); }

  /* Modal */
  .modal-overlay {
    display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1000;
    align-items: center; justify-content: center; padding: 20px;
  }
  .modal-overlay.active { display: flex; }
  .modal-content {
    background: var(--white); padding: 30px; border-radius: 24px; max-width: 400px; width: 100%;
    text-align: center; box-shadow: 0 20px 40px rgba(0,0,0,0.2);
  }
  .modal-content h3 { color: var(--cuke-deep); margin-bottom: 12px; }
  .modal-content p { font-size: 0.95rem; color: var(--text-soft); margin-bottom: 24px; line-height: 1.5; }
  .modal-content .btn { width: 100%; }

  /* Responsive */
  @media (min-width: 768px) {
    .main-nav { display: block; }
    .header-actions { display: none; }
    .hero h1 { font-size: 3rem; }
    .hero-inner { flex-direction: row; text-align: left; justify-content: space-between; align-items: center; }
    .hero-text { flex: 1; }
    .hero-visual { flex: 1; max-width: 400px; margin-top: 0; }
    .update-item { flex: 0 0 220px; }
    .poster-grid { grid-template-columns: repeat(4, 1fr); }
    .flow-steps { grid-template-columns: repeat(2, 1fr); }
    .two-col { grid-template-columns: 1fr 1fr; }
    .rank-grid { display: grid; grid-template-columns: 1fr 1fr; }
  }
  @media (min-width: 1024px) {
    section { padding: 80px 20px; }
    .hero h1 { font-size: 3.5rem; }
    .category-grid { grid-template-columns: repeat(4, 1fr); }
    .flow-steps { grid-template-columns: repeat(4, 1fr); }
    .update-item { flex: 0 0 240px; }
    .poster-grid { grid-template-columns: repeat(5, 1fr); }
    .rank-grid { grid-template-columns: repeat(3, 1fr); }
  }