/* Base Variables & Reset */
    :root {
      --primary: #0891B2;
      --primary-hover: #0e7490;
      --dark-cyan: #164E63;
      --pale-blue: #F0F9FF;
      --text-dark: #1A1A1A;
      --text-gray: #64748B;
      --white: #FFFFFF;
    }

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

    body {
      font-family: "Noto Sans JP", sans-serif;
      color: var(--text-dark);
      line-height: 1.6;
      overflow-x: hidden;
      background-color: var(--white);
    }

    /* Layout Utilities */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* Hero / First View */
    .hero {
      position: relative;
      background-image: url('/lp/bizdev-mailmagazine/img/bg.webp');
      background-size: cover;
      background-position: center;
      color: var(--white);
      overflow: hidden;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(13, 27, 42, 0.8) 0%, rgba(22, 78, 99, 0.7) 50%, rgba(27, 58, 75, 0.8) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 10;
      padding: 4rem 0 2rem;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    @media (min-width: 1024px) {
      .hero-content {
        flex-direction: row;
        min-height: 85vh;
        padding: 0;
      }
    }

    .hero-text {
      flex: 1;
      text-align: center;
      padding-bottom: 2rem;
    }

    @media (min-width: 1024px) {
      .hero-text {
        text-align: left;
        padding: 0 3rem 0 0;
      }
    }

    .hero-label {
      font-size: 0.875rem;
      letter-spacing: 0.3em;
      color: #67e8f9;
      font-weight: 500;
      margin-bottom: 1.25rem;
      text-transform: uppercase;
    }

    .hero-title {
      font-size: clamp(1.75rem, 4vw, 3.25rem);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
      letter-spacing: -0.01em;
    }

    .hero-subtext {
      font-size: clamp(0.9375rem, 1.7vw, 1.3125rem);
      color: #e5e7eb;
      margin-bottom: 2rem;
      line-height: 1.7;
    }

    .cta-button {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background-color: var(--primary);
      color: var(--white);
      padding: 1rem 2rem;
      border-radius: 0.5rem;
      font-weight: 700;
      text-decoration: none;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      font-size: 1.125rem;
    }

    .cta-button:hover {
      background-color: var(--primary-hover);
      transform: scale(1.02);
      box-shadow: 0 10px 15px -3px rgba(8, 145, 178, 0.4);
    }

    .hero-mockup {
      flex: 1;
      width: 100%;
      display: flex;
      justify-content: flex-end;
    }
    @media (max-width: 1023px) {
      .hero-mockup {
        justify-content: center;
      }
    }

    .hero-mockup img {
      width: 100%;
      max-width: 680px;
      filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.4));
    }

    /* Credentials Carousel */
    .credentials-section {
      position: relative;
      z-index: 10;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding: 1.5rem 0;
      background: rgba(13, 27, 42, 0.5);
    }

    .credentials-label {
      text-align: center;
      color: #d1d5db;
      font-size: 1rem;
      margin-bottom: 1.5rem;
      font-weight: 500;
    }

    .carousel-container {
      overflow: hidden;
      white-space: nowrap;
      position: relative;
    }

    .carousel-track {
      display: flex;
      gap: 1rem;
      animation: scroll 40s linear infinite;
      width: max-content;
    }

    .carousel-track:hover {
      animation-play-state: paused;
    }

    @keyframes scroll {
      0% {
        transform: translateX(0);
      }

      100% {
        transform: translateX(-50%);
      }
    }

    .carousel-item {
      width: 280px;
      flex-shrink: 0;
      border-radius: 0.5rem;
      overflow: hidden;
      opacity: 0.9;
    }

    .carousel-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Sections */
    .section {
      padding: 5rem 0;
    }

    .section#section-what-you-get {
      padding: 1rem 0 5rem;
    }

    .section-title {
      font-size: clamp(1.5rem, 3vw, 2.25rem);
      font-weight: 700;
      color: var(--dark-cyan);
      margin-bottom: 1.25rem;
      text-align: center;
    }

    .section-desc {
      text-align: center;
      color: var(--text-gray);
      max-width: 40rem;
      margin: 0 auto 3.5rem;
      font-size: 1.125rem;
    }

    /* BizDev Definition */
    .definition-box {
      max-width: 48rem;
      margin: 0 auto;
    }

    .definition-text {
      font-size: 1.125rem;
      margin-bottom: 2.5rem;
    }

    .definition-text strong {
      color: var(--primary);
    }

    .chart-container {
      background-color: #F8FAFB;
      padding: 2rem;
      border-radius: 1rem;
      border: 1px solid #f1f5f9;
      text-align: center;
    }

    .chart-container img {
      width: 100%;
      max-width: 42rem;
      border-radius: 0.5rem;
    }

    /* What You Get / 3days Course */
    .wyg-section {
      background: linear-gradient(to bottom, var(--white), #f0fafb, var(--white));
    }

    .card {
      background: var(--white);
      border-radius: 0.75rem;
      border: 1px solid #e5e7eb;
      overflow: hidden;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    .card-header {
      background-color: var(--dark-cyan);
      padding: 1.25rem;
      color: var(--white);
    }

    .course-list {
      padding: 1.25rem;
    }

    .course-item {
      display: flex;
      gap: 1rem;
      padding: 1rem 0;
      border-bottom: 1px solid #f3f4f6;
    }

    .course-item:last-child {
      border-bottom: none;
    }

    .day-badge {
      width: 2.5rem;
      height: 2.5rem;
      background: rgba(8, 145, 178, 0.1);
      color: var(--primary);
      border: 1px solid rgba(8, 145, 178, 0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .course-title {
      font-weight: 700;
      color: var(--dark-cyan);
      font-size: 1.125rem;
    }

    .course-sub {
      color: var(--text-gray);
      font-size: 0.875rem;
      margin-top: 0.25rem;
    }

    /* Newsletter Image Grid */
    .image-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1rem;
      margin-top: 2rem;
    }

    @media (min-width: 768px) {
      .image-grid {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    .grid-item {
      border-radius: 0.5rem;
      overflow: hidden;
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }

    .grid-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Footer CTA */
    .footer-cta {
      background-color: var(--dark-cyan);
      padding: 5rem 0;
      text-align: center;
      color: var(--white);
    }

    .footer-copyright {
      color: var(--pale-blue);
      background-color: var(--dark-cyan);
      font-size: 0.875rem;
      text-align: center;
      padding: 0 0 2.5rem 0;
    }

    /* Sticky CTA */
    #sticky-cta {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--dark-cyan);
      color: var(--white);
      z-index: 100;
      transform: translateY(100%);
      transition: transform 0.3s ease;
      box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    }

    #sticky-cta.visible {
      transform: translateY(0);
    }

    .sticky-content {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 1.5rem;
      height: 4.5rem;
      padding: 0 1.5rem;
    }

    @media (max-width: 767px) {
      .sticky-content span {
        display: none;
      }

      .sticky-content .cta-button {
        width: 100%;
      }
    }

    /* Mailchimp Iframe Container */
    #mc-iframe {
      width: 100%;
      border: none;
      min-height: 2000px; /* フォームの概算高さ */
      transition: height 0.3s ease;
    }


    .iframe-wrapper {
      background: var(--white);
      border-radius: 1rem;
      overflow: hidden;
      max-width: 640px;
      margin: 2rem auto 0;
    }

    iframe {
      width: 100%;
      border: none;
    }

    /* Animations */
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: all 0.8s ease-out;
    }

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