:root {
    --green: #005f3d;
    --green-light: #e8f4ef;
    --green-mid: #2d8a62;
    --green-dark: #003d28;
    --cream: #faf8f3;
    --warm-white: #fffef9;
    --text: #1a1a18;
    --text-muted: #5a5a52;
    --text-light: #8a8a80;
    --border: #e2e0d8;
    --sans: 'Noto Sans KR', sans-serif;
  }

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

  html { scroll-behavior: smooth; }

  body {
    font-family: var(--sans);
    background: var(--warm-white);
    color: var(--text);
    overflow-x: hidden;
  }

  /* ── NAV ── */
  nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(255,254,249,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 5vw;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
  }

  .nav-logo-image {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: block;
    object-fit: cover;
    flex-shrink: 0;
  }

  .nav-logo-text {
    font-family: var(--sans);
    font-weight: 700;
    font-size: 17px;
    color: var(--green-dark);
    letter-spacing: -0.3px;
  }

  .nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
  }

  .nav-links a {
    font-size: 13.5px;
    font-weight: 400;
    color: var(--text-muted);
    text-decoration: none;
    letter-spacing: 0.2px;
    transition: color 0.2s;
  }

  .nav-links a:hover { color: var(--green); }

  .nav-cta {
    background: var(--green);
    color: #fff !important;
    padding: 8px 18px;
    border-radius: 6px;
    font-weight: 500 !important;
    font-size: 13px !important;
    transition: background 0.2s !important;
  }

  .nav-cta:hover { background: var(--green-dark) !important; color: #fff !important; }

  .nav-mobile-cta {
    display: none;
  }

  /* ── HERO ── */
  #hero {
    min-height: 100vh;
    padding-top: 64px;
    background: var(--cream);
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 0;
    overflow: hidden;
  }

  .hero-left {
    padding: 80px 5vw 80px 8vw;
  }

  .hero-tag {
    display: inline-block;
    background: var(--green-light);
    color: var(--green);
    font-size: 12px;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: 100px;
    letter-spacing: 0.5px;
    margin-bottom: 28px;
  }

  .hero-headline {
    font-family: var(--sans);
    font-size: clamp(32px, 4vw, 52px);
    font-weight: 700;
    line-height: 1.35;
    color: var(--green-dark);
    letter-spacing: -1px;
    margin-bottom: 20px;
  }

  .hero-headline em {
    font-style: normal;
    color: var(--green);
    position: relative;
  }

  .hero-sub {
    font-size: 16px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 420px;
  }

  .hero-meta {
    display: flex;
    gap: 24px;
    margin-bottom: 40px;
  }

  .hero-meta-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .hero-meta-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-light);
    letter-spacing: 0.8px;
    text-transform: uppercase;
  }

  .hero-meta-value {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
  }

  .hero-btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }

  .btn-primary {
    background: var(--green);
    color: #fff;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
    display: inline-block;
  }

  .btn-primary:hover { background: var(--green-dark); transform: translateY(-1px); }

  .btn-secondary {
    background: transparent;
    color: var(--green);
    border: 1.5px solid var(--green);
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    display: inline-block;
  }

  .btn-secondary:hover { background: var(--green-light); transform: translateY(-1px); }

  .hero-right {
    height: 100vh;
    position: relative;
    background: var(--green);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .hero-visual {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px;
  }

  .hero-big-char {
    font-family: var(--sans);
    font-size: clamp(120px, 18vw, 200px);
    font-weight: 700;
    color: rgba(255,255,255,0.08);
    line-height: 1;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    white-space: nowrap;
    pointer-events: none;
  }

  .hero-icon-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    position: relative;
    z-index: 3;
  }

  .hero-card {
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 12px;
    padding: 20px 28px;
    backdrop-filter: blur(10px);
    color: #fff;
    width: 280px;
    text-align: left;
  }

  .hero-card-label {
    font-size: 11px;
    opacity: 0.6;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-bottom: 8px;
    font-weight: 500;
  }

  .hero-card-text {
    font-family: var(--sans);
    font-size: 17px;
    font-weight: 600;
    line-height: 1.5;
  }

  .hero-card-accent {
    background: rgba(255,255,255,0.22);
    transform: translateX(20px);
  }

  /* ── SECTION BASE ── */
  section { padding: 100px 8vw; }

  @supports (content-visibility: auto) {
    #about,
    #class,
    #reviews,
    #faq,
    #contact {
      content-visibility: auto;
      contain-intrinsic-size: 760px;
    }
  }

  .section-label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--green);
    margin-bottom: 16px;
  }

  .section-title {
    font-family: var(--sans);
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 700;
    color: var(--green-dark);
    line-height: 1.35;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
  }

  .section-desc {
    font-size: 16px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.85;
    max-width: 560px;
  }

  /* ── ABOUT ── */
  #about {
    background: var(--warm-white);
  }

  .about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
    margin-top: 60px;
  }

  .about-points {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .about-point {
    display: flex;
    gap: 20px;
    align-items: flex-start;
  }

  .about-point-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--green);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .about-point-title {
    font-family: var(--sans);
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
  }

  .about-point-text {
    font-size: 14.5px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.8;
  }

  .about-right {
    background: var(--green);
    border-radius: 16px;
    padding: 48px 44px;
    color: #fff;
    position: sticky;
    top: 90px;
  }

  .about-right-title {
    font-family: var(--sans);
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.4;
  }

  .about-right-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 36px;
  }

  .about-right-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 15px;
    font-weight: 300;
  }

  .about-right-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255,255,255,0.6);
    flex-shrink: 0;
  }

  .about-right-divider {
    height: 1px;
    background: rgba(255,255,255,0.15);
    margin-bottom: 28px;
  }

  .about-right-quote {
    font-family: var(--sans);
    font-size: 15px;
    font-weight: 400;
    line-height: 1.85;
    opacity: 0.85;
    font-style: italic;
  }

  /* ── CLASS ── */
  #class {
    background: var(--cream);
  }

  .class-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 60px;
    flex-wrap: wrap;
    gap: 20px;
  }

  .class-header-desc {
    margin: 0;
    max-width: 340px;
    font-size: 14.5px;
  }

  .class-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .class-card {
    background: var(--warm-white);
    border-radius: 12px;
    padding: 36px 32px;
    border: 1px solid var(--border);
    transition: transform 0.25s, box-shadow 0.25s;
    position: relative;
    overflow: hidden;
  }

  .class-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--green);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s;
  }

  .class-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,95,61,0.1); }
  .class-card:hover::before { transform: scaleX(1); }

  .class-card-icon {
    width: 48px;
    height: 48px;
    background: var(--green-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 22px;
  }

  .class-card-title {
    font-family: var(--sans);
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
  }

  .class-card-text {
    font-size: 14px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.85;
  }

  .class-info-bar {
    margin-top: 40px;
    background: var(--green);
    border-radius: 12px;
    padding: 28px 40px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
  }

  .class-info-item {
    text-align: center;
    color: #fff;
  }

  .class-info-item-label {
    font-size: 11px;
    letter-spacing: 1px;
    opacity: 0.65;
    text-transform: uppercase;
    font-weight: 500;
    margin-bottom: 6px;
  }

  .class-info-item-value {
    font-family: var(--sans);
    font-size: 20px;
    font-weight: 700;
  }

  .class-info-phone {
    color: #fff;
    text-decoration: none;
  }

  .class-info-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.2);
  }

  /* ── REVIEWS ── */
  #reviews {
    background: var(--warm-white);
  }

  .reviews-grid {
    margin-top: 60px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .review-card {
    background: var(--cream);
    border-radius: 12px;
    padding: 32px 28px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: transform 0.2s;
  }

  .review-card:hover { transform: translateY(-3px); }

  .review-stars {
    color: var(--green);
    font-size: 16px;
    letter-spacing: 2px;
  }

  .review-text {
    font-size: 14.5px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.9;
    flex: 1;
  }

  .review-highlight {
    font-weight: 500;
    color: var(--text);
  }

  .review-author {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
  }

  .review-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--green);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .review-author-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
  }

  .review-author-sub {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 2px;
  }

  /* ── FAQ ── */
  #faq {
    background: var(--cream);
  }

  .faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 60px;
  }

  .faq-item {
    background: var(--warm-white);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
  }

  .faq-question {
    width: 100%;
    background: none;
    border: none;
    cursor: pointer;
    padding: 24px 28px;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-family: var(--sans);
  }

  .faq-q-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    line-height: 1.5;
  }

  .faq-arrow {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--green-light);
    color: var(--green);
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.3s, background 0.2s;
    font-weight: 300;
    line-height: 1;
  }

  .faq-item.open .faq-arrow {
    transform: rotate(45deg);
    background: var(--green);
    color: #fff;
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .faq-answer-inner {
    padding: 0 28px 24px;
    font-size: 14.5px;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.85;
    border-top: 1px solid var(--border);
    padding-top: 20px;
  }

  .faq-youtube-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    color: var(--green);
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px solid var(--green-light);
    padding-bottom: 2px;
    transition: border-color 0.2s;
  }

  .faq-youtube-link:hover { border-color: var(--green); }

  /* ── CONTACT ── */
  #contact {
    background: var(--green-dark);
    color: #fff;
    text-align: center;
    padding: 120px 8vw;
    position: relative;
    overflow: hidden;
  }

  .contact-bg-text {
    position: absolute;
    font-family: var(--sans);
    font-size: 300px;
    font-weight: 700;
    color: rgba(255,255,255,0.03);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    white-space: nowrap;
    pointer-events: none;
  }

  #contact .section-label { color: rgba(255,255,255,0.5); }

  .contact-title {
    font-family: var(--sans);
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
  }

  .contact-desc {
    font-size: 16px;
    font-weight: 300;
    opacity: 0.7;
    margin-bottom: 48px;
    line-height: 1.8;
    position: relative;
    z-index: 1;
  }

  .contact-phone-wrap {
    position: relative;
    z-index: 1;
    margin-bottom: 48px;
  }

  .contact-phone-label {
    font-size: 12px;
    letter-spacing: 1px;
    opacity: 0.5;
    text-transform: uppercase;
    margin-bottom: 12px;
  }

  .contact-phone {
    font-family: var(--sans);
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 700;
    letter-spacing: -1px;
    display: block;
    text-decoration: none;
    color: #fff;
    transition: opacity 0.2s;
  }

  .contact-phone:hover { opacity: 0.75; }

  .contact-apply-wrap {
    position: relative;
    z-index: 1;
    margin-bottom: 48px;
  }

  .contact-apply {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 56px;
    padding: 0 34px;
    border-radius: 8px;
    background: #fff;
    color: var(--green-dark);
    font-size: 17px;
    font-weight: 700;
    text-decoration: none;
    transition: opacity 0.2s, transform 0.15s;
  }

  .contact-apply:hover {
    opacity: 0.86;
    transform: translateY(-1px);
  }

  .contact-note {
    font-size: 13px;
    opacity: 0.45;
    margin-top: 10px;
  }

  .contact-note a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 3px;
  }

  .contact-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
  }

  .contact-link {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    color: #fff;
    padding: 12px 22px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 400;
    text-decoration: none;
    transition: background 0.2s;
  }

  .contact-link:hover { background: rgba(255,255,255,0.18); }

  .contact-link-icon {
    font-size: 18px;
    opacity: 0.8;
  }

  /* ── FOOTER ── */
  footer {
    background: #001f14;
    color: rgba(255,255,255,0.4);
    padding: 32px 8vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .footer-logo {
    font-family: var(--sans);
    font-weight: 700;
    font-size: 16px;
    color: rgba(255,255,255,0.7);
  }

  .footer-phone {
    color: rgba(255,255,255,0.5);
  }

  /* ── SCROLL REVEAL ── */
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .reveal.visible {
    opacity: 1;
    transform: none;
  }

  /* ── MOBILE ── */
  @media (max-width: 900px) {
    #hero {
      grid-template-columns: 1fr;
      min-height: auto;
    }

    .hero-left { padding: 60px 6vw 40px; }

    .hero-right {
      height: 300px;
    }

    .about-grid,
    .class-cards,
    .reviews-grid,
    .faq-grid {
      grid-template-columns: 1fr;
    }

    .about-right { position: static; }

    .nav-links { display: none; }

    .nav-mobile-cta {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-mobile-cta a {
      background: var(--green);
      color: #fff;
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 500;
      text-decoration: none;
    }

    .class-info-divider { display: none; }

    section { padding: 70px 6vw; }

    .class-header { flex-direction: column; align-items: flex-start; }

    footer { justify-content: center; text-align: center; }
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *,
    *::before,
    *::after {
      transition-duration: 0.01ms !important;
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
    }

    .reveal {
      opacity: 1;
      transform: none;
    }
  }