/* Global Reset & Base Styles */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html,
    body {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      line-height: 1.6;
      color: #000;
    }

    /* Header */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(10px);
      z-index: 1000;
      padding: 16px 40px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #000;
      text-decoration: none;
    }

    .contact-btn {
      padding: 12px 24px;
      background: #000;
      color: #fff;
      text-decoration: none;
      border-radius: 4px;
      font-weight: 500;
      cursor: pointer;
    }

    /* Sections */
    .section {
      min-height: 100vh;
      padding: 120px 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.6s ease;
    }

    /* Progressive grayscale gradient backgrounds */
    .hero {
      background-color: #FFFFFF !important;
      /* 흰색 */
      color: #000;
    }

    .core {
      background: #F0F0F0 !important;
      /* 밝은 회색 */
      color: #000;
    }

    .rhythm {
      background: #E0E0E0 !important;
      /* 약간 밝은 회색 */
      color: #000;
    }

    .structure {
      background: #C8C8C8 !important;
      /* 조금 어두운 회색 */
      color: #1a1a1a;
    }

    .algorithm {
      background: #A0A0A0 !important;
      /* 약간 어두운 회색 */
      color: #1a1a1a;
    }

    .ai {
      background: #787878 !important;
      /* 어두운 회색 */
      color: #ffffff;
    }

    .flow {
      background: #585858 !important;
      /* 조금 더 어두운 회색 */
      color: #ffffff;
    }

    .business {
      background: #383838 !important;
      /* 많이 어두운 회색 */
      color: #ffffff;
    }

    .network {
      background: #282828 !important;
      /* Network 섹션 배경 */
      color: #ffffff;
    }

    .contact {
      background: #1a1a1a !important;
      /* 진한 회색 (옅은 검정) */
      color: #ffffff;
    }

    .container {
      max-width: 1200px;
      width: 100%;
      margin: 0 auto;
    }

    /* Reset Defaults */
    html,
    body {
      margin: 0;
      padding: 0;
      width: 100%;
      height: 100%;
      overflow-x: hidden;
    }

    /* Hero */
    .hero {
      background-image: url('hero-bg-new.png');
      background-size: 100% 100%;
      background-position: center;
      background-attachment: fixed;
      background-repeat: no-repeat;
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      width: 100vw;
      min-height: 100vh;
      margin: 0;
      padding: 0;
      position: relative;
    }

    .hero h1 {
      font-size: 96px;
      font-weight: 700;
      margin-bottom: 20px;
      opacity: 0;
      transform: translateY(50px);
      animation: heroFadeUp 1s ease-out 0.3s forwards;
    }

    .hero .subtitle {
      font-size: 30px;
      font-weight: 300;
      margin-bottom: 40px;
      opacity: 0;
      transform: translateY(50px);
      animation: heroFadeUp 1s ease-out 0.6s forwards;
    }

    .hero .slogan {
      font-size: 50px;
      font-weight: 500;
      line-height: 1.2;
      margin-bottom: 30px;
    }

    .hero .slogan-line {
      opacity: 0;
      transform: translateY(50px);
      display: block;
      margin: 10px 0;
    }

    .hero .slogan-line:nth-child(1) {
      animation: heroFadeUp 1s ease-out 0.8s forwards;
    }

    .hero .slogan-line:nth-child(2) {
      animation: heroFadeUp 1s ease-out 0.95s forwards;
    }

    .hero .slogan-line:nth-child(3) {
      animation: heroFadeUp 1s ease-out 1.1s forwards;
    }

    .hero .description {
      font-size: 19px;
      font-weight: 300;
      opacity: 0;
      animation: fadeIn 1s ease-out 1.5s forwards;
    }

    @keyframes heroFadeUp {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
      }
    }

    /* Two Column Layout */
    .two-column {
      display: flex;
      align-items: center;
      gap: 50px;
    }

    .text-block {
      flex: 1;
    }

    .text-block h2 {
      font-size: 60px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 28px;
    }

    .text-block p {
      font-size: 20px;
      line-height: 1.7;
    }

    .section-subtitle {
      font-size: 24px;
      font-weight: 300;
      margin-bottom: 20px;
      opacity: 0.8;
      margin-top: -15px;
    }

    .image-block {
      flex: 1;
    }

    .image-block img {
      width: 100%;
      height: auto;
      border-radius: 8px;
    }

    /* Image blocks - transparent backgrounds */
    .image-block img {
      background-color: transparent;
      padding: 0;
    }

    /* Core Section */
    .core .text-block {
      flex: 0 0 50%;
    }

    .core .image-block {
      flex: 0 0 50%;
      position: relative;
    }

    /* Core Image Dynamic Effect */
    .core .image-block img {
      transition: transform 0.3s ease;
      background-color: transparent;
      padding: 0;
      border-radius: 0;
    }

    .core .image-block:hover img {
      transform: scale(1.05);
    }

    .core .image-block::after {
      content: '';
      position: absolute;
      top: 50%;
      left: 50%;
      width: 20px;
      height: 20px;
      background: rgba(0, 0, 0, 0.8);
      border-radius: 50%;
      transform: translate(-50%, -50%);
      animation: corePulse 2s ease-in-out infinite;
      pointer-events: none;
    }

    @keyframes corePulse {

      0%,
      100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
      }

      50% {
        transform: translate(-50%, -50%) scale(3);
        opacity: 0;
      }
    }

    /* Rhythm Section */
    .rhythm .image-block {
      flex: 0 0 50%;
      order: -1;
      position: relative;
    }

    .rhythm .text-block {
      flex: 0 0 50%;
    }

    /* Rhythm Image Dynamic Effect */
    .rhythm .image-block img {
      transition: transform 0.3s ease;
    }

    .rhythm .image-block:hover img {
      transform: scale(1.03);
    }

    /* Structure Section */
    .structure .text-block,
    .structure .image-block {
      flex: 0 0 50%;
    }

    .structure .image-block {
      position: relative;
    }

    /* Structure Image Dynamic Effect */
    .structure .image-block img {
      transition: transform 0.3s ease;
    }

    .structure .image-block:hover img {
      transform: scale(1.04);
    }

    /* Algorithm Section */
    .algorithm .image-block {
      flex: 0 0 50%;
      order: -1;
      position: relative;
    }

    .algorithm .text-block {
      flex: 0 0 50%;
    }

    /* Algorithm Image Dynamic Effect */
    .algorithm .image-block img {
      transition: transform 0.3s ease;
    }

    .algorithm .image-block:hover img {
      transform: scale(1.05);
    }

    /* AI Section */
    .ai .text-block {
      flex: 0 0 50%;
    }

    .ai .image-block {
      flex: 0 0 50%;
    }

    /* Flow Section */
    .flow .image-block {
      flex: 0 0 50%;
      order: -1;
    }

    .flow .text-block {
      flex: 0 0 50%;
    }

    /* Business Divisions */
    .business {
      text-align: center;
      flex-direction: column;
    }

    .business h2 {
      font-size: 52px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .business .subtitle {
      font-size: 22px;
      font-weight: 300;
      margin-bottom: 60px;
    }

    .business-visual {
      margin-bottom: 60px;
      position: relative;
    }

    .business-description {
      text-align: center;
      margin-bottom: 80px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .business-description .main-line {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 24px;
      color: #fff;
    }

    .business-description .sub-lines p {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.8);
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .business-visual img {
      max-width: 900px;
      /* 1200px의 75% */
      width: 75%;
      /* 25% 축소 */
      height: auto;
      image-rendering: -webkit-optimize-contrast;
      image-rendering: crisp-edges;
    }

    .divisions {
      display: flex;
      flex-direction: column;
      gap: 60px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .division {
      text-align: left;
      padding: 40px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 8px;
    }

    .division h3 {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .division .division-subtitle {
      font-size: 19px;
      font-weight: 500;
      margin-bottom: 20px;
      opacity: 0.8;
    }

    .division p {
      font-size: 17px;
      line-height: 1.6;
    }

    /* Network Section */
    .network {
      text-align: center;
      flex-direction: column;
      align-items: center;
      min-height: auto;
      padding: 100px 0;
    }

    .network h2 {
      font-size: 52px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .network .subtitle {
      font-size: 22px;
      font-weight: 300;
      margin-bottom: 60px;
      max-width: 900px;
      line-height: 1.5;
      margin-left: auto;
      margin-right: auto;
    }

    .network-categories {
      display: flex;
      flex-direction: column;
      gap: 50px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .network-category {
      text-align: center;
    }

    .network-category h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 25px;
      color: #fff;
    }

    .tool-list {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.85);
      line-height: 1.8;
      transition: color 0.3s ease;
    }

    .tool-list:hover {
      color: #fff;
    }

    /* Contact */
    .contact {
      text-align: center;
      flex-direction: column;
    }

    .contact h2 {
      font-size: 52px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .contact .subtitle {
      font-size: 22px;
      margin-bottom: 60px;
    }

    .contact-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 60px;
      margin: 0 auto;
    }

    .contact-form {
      max-width: 700px;
      width: 100%;
    }

    .form-group {
      margin-bottom: 24px;
      text-align: left;
    }

    .form-group label {
      display: block;
      font-size: 15px;
      font-weight: 500;
      margin-bottom: 8px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 12px;
      border: 1px solid rgba(255, 255, 255, 0.3);
      background: rgba(255, 255, 255, 0.05);
      color: #fff;
      font-size: 15px;
    }

    .form-group textarea {
      height: 180px;
      resize: vertical;
      white-space: pre-wrap;
    }

    .submit-btn {
      display: block;
      margin-left: auto;
      padding: 12px 24px;
      background: #fff;
      color: #000;
      text-decoration: none;
      border: none;
      border-radius: 4px;
      font-weight: 500;
      font-size: 15px;
      cursor: pointer;
      transition: opacity 0.3s ease;
    }

    .submit-btn:hover {
      opacity: 0.8;
    }

    .contact-info {
      max-width: 900px;
      width: 100%;
      text-align: center;
      margin: 60px auto 0;
    }

    .contact-info h3 {
      font-size: 28px;
      margin-bottom: 30px;
    }

    .info-grid {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 15px;
      text-align: center;
      align-items: center;
    }

    .info-item {
      font-size: 16px;
      color: rgba(255, 255, 255, 0.8);
      display: inline-flex;
      align-items: center;
      white-space: nowrap;
    }

    .info-item:not(:last-child)::after {
      content: '|';
      margin-left: 20px;
      color: rgba(255, 255, 255, 0.3);
    }

    .info-item strong {
      font-weight: 600;
      margin-right: 8px;
      color: #fff;
    }

    .info-address {
      text-align: center;
      font-size: 16px;
      color: rgba(255, 255, 255, 0.8);
      margin-top: 0;
    }

    .info-address strong {
      font-weight: 600;
      margin-right: 8px;
      color: #fff;
    }

    /* Mobile adjustment for contact info */
    @media (max-width: 768px) {
      .info-grid {
        flex-direction: column;
        gap: 15px;
        align-items: center;
      }

      .info-item {
        justify-content: center;
      }

      .info-item:not(:last-child)::after {
        display: none;
      }

      .info-address {
        padding: 0 20px;
      }
    }

    /* Animations */
    .animate-on-scroll {
      opacity: 0;
      transform: translateY(50px);
      transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    .animate-on-scroll.animate-left {
      transform: translateX(-50px);
    }

    .animate-on-scroll.animate-right {
      transform: translateX(50px);
    }

    .animate-on-scroll.animate-scale {
      transform: scale(0.9);
    }

    .animate-on-scroll.visible {
      opacity: 1;
      transform: translateY(0) translateX(0) scale(1);
    }

    /* Responsive */
    @media (max-width: 768px) {

      html,
      body {
        overflow-x: hidden;
        max-width: 100vw;
      }

      .section {
        padding: 80px 20px;
        max-width: 100vw;
      }

      /* Mobile: Image on top, text below for all sections */
      .two-column .image-block {
        order: -1 !important;
      }

      .hero h1 {
        font-size: 48px;
      }

      .hero .subtitle {
        font-size: 20px;
      }

      .hero .slogan {
        font-size: 28px;
      }

      .hero .description {
        font-size: 16px;
      }

      /* Mobile Hero Background Adjustment */
      .hero {
        background-attachment: scroll;
        background-size: 100% 100%;
      }

      .two-column {
        flex-direction: column;
        gap: 40px;
      }

      .text-block h2 {
        font-size: 36px;
      }

      .algorithm h2 {
        font-size: 40px;
      }

      .algorithm .content {
        padding: 40px 30px;
      }

      .business h2,
      .network h2,
      .contact h2 {
        font-size: 36px;
      }

      .contact-content {
        gap: 40px;
      }

      .info-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

      .header {
        padding: 12px 20px;
      }

      .logo {
        font-size: 20px;
      }

      /* Footer */
      .footer {
        background: #000;
        color: rgba(255, 255, 255, 0.6);
        padding: 40px 20px;
        text-align: center;
        font-size: 14px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
      }

      .footer-links {
        display: flex;
        justify-content: center;
        gap: 30px;
        margin-bottom: 20px;
      }

      .footer-links a {
        color: rgba(255, 255, 255, 0.6);
        text-decoration: none;
        transition: color 0.3s ease;
      }

      .footer-links a:hover {
        color: #fff;
      }

      .copyright {
        font-weight: 300;
      }

      .contact-btn {
        padding: 8px 16px;
        font-size: 14px;
      }
    }

    /* Footer */
    .footer {
      background-color: #0a0a0a;
      padding: 40px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      text-align: center;
    }

    .footer-links {
      display: flex;
      justify-content: center;
      gap: 30px;
      margin-bottom: 20px;
    }

    .footer-links a {
      color: rgba(255, 255, 255, 0.7);
      text-decoration: none;
      font-size: 14px;
    }

    .footer-links a:hover {
      color: #fff;
    }

    .copyright {
      color: rgba(255, 255, 255, 0.5);
      font-size: 13px;
      text-align: center;
    }