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

    :root {
      --black: #111;
      --white: #fafbfc;
      --cream: #f0f4f8;
      --accent: #4A90E2;
      --accent-deep: #2E6DC2;
      --accent-light: #E3F2FD;
      --navy: #16324F;
      --gray: #888;
      --dark-gray: #444;
      --border: rgba(74, 144, 226, 0.15);
    }

    html { scroll-behavior: smooth; }
    body { font-family: 'Pretendard', sans-serif; background: var(--white); color: var(--black); overflow-x: hidden; }

    /* NAV */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      display: flex; align-items: center; justify-content: space-between;
      padding: 1.2rem 2rem;
      background: rgba(250, 251, 252, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-logo { font-family: 'Pretendard', sans-serif; font-weight: 900; font-size: 1.5rem; color: var(--black); text-decoration: none; position: relative; z-index: 101; }    
    .nav-logo span { color: var(--accent); }
    .nav-links { display: flex; gap: 2rem; list-style: none; }
    .nav-links a { font-size: 0.95rem; color: var(--dark-gray); text-decoration: none; letter-spacing: 0.02em; transition: color 0.2s; }
    .nav-links a:hover { color: var(--accent); }
    .nav-cta { background: var(--accent); color: var(--white) !important; padding: 0.65rem 1.4rem; border-radius: 2rem; font-size: 0.95rem !important; transition: background 0.2s !important; }
    .nav-cta:hover { background: var(--accent-deep) !important; }
    .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--black); padding: 0; position: relative; z-index: 101; }    

    /* HERO */
    .hero { background: linear-gradient(135deg, #F5F8FE 0%, #E3F2FD 55%, #D3E7FB 100%); padding: 8.5rem 2.5rem 4.5rem; }
    .hero-inner { max-width: 1040px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, .78fr); gap: 1rem; align-items: center; }
    .hero-left { display: flex; flex-direction: column; justify-content: center; }
    .hero-tag { display: inline-flex; align-items: center; gap: 0.5rem; font-size: 1.5rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin-bottom: 2rem; }
    .hero-tag::before { content: ''; display: inline-block; width: 24px; height: 1px; background: var(--accent); }
    .hero-title { font-family: 'Pretendard', sans-serif; font-size: clamp(3rem, 5vw, 5rem); font-weight: 900; line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 1.5rem; }
    .hero-title em { font-style: normal; color: var(--accent); }
    .hero-sub { font-size: 1.15rem; color: var(--dark-gray); line-height: 1.7; font-weight: 400; max-width: 540px; margin-bottom: 2rem; }
    .hero-sub strong { color: var(--black); font-weight: 700; }
    .hero-buttons { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; }
    .btn-primary {
      background: var(--accent); color: var(--white); padding: 1.05rem 2.4rem; border-radius: 3rem;
      font-size: 1rem; font-weight: 700; text-decoration: none; border: none; cursor: pointer;
      font-family: 'Pretendard', sans-serif; display: inline-block; transition: transform 0.2s, box-shadow 0.2s;
    }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74, 144, 226, 0.3); }
    .btn-text {
      display: inline-flex; align-items: center; justify-content: center;
      height: 53px; padding: 0 1.8rem; border: 1.5px solid rgba(74, 144, 226, .28); border-radius: 3rem;
      background: rgba(255,255,255,.82); color: var(--accent-deep); font-size: 1rem; font-weight: 700;
      text-decoration: none; transition: border-color .2s, background .2s, transform .2s;
    }
    .btn-text:hover { background: var(--white); border-color: var(--accent); transform: translateY(-2px); }
    .trial-cta-wrap { position: relative; display: inline-flex; }
    .trial-event-bubble {
      position: absolute; left: 50%; bottom: calc(100% + 8px); transform: translateX(-50%);
      padding: .38rem .72rem; border-radius: .75rem; background: #FF6B5F; color: #fff;
      font-size: .76rem; font-weight: 800; line-height: 1; white-space: nowrap;
      box-shadow: 0 5px 14px rgba(255, 107, 95, .28); pointer-events: none;
    }
    .trial-event-bubble::after {
      content: ''; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
      border: 5px solid transparent; border-top-color: #FF6B5F;
    }
    .hero-micro { font-size: 0.88rem; color: var(--gray); margin-top: 1rem; max-width: 460px; line-height: 1.6; }

    .hero-right { position: relative; display: flex; align-items: center; justify-content: center; }
    .hero-teacher-carousel-shell { width: min(410px, 100%); overflow: visible; }
    .teacher-flip-deck {
      --stack-x: 24px;
      --stack-y: 18px;
      --stack-angle: 3deg;
      --stack-space: 80px;
      position: relative;
      display: grid;
      isolation: isolate;
      width: 100%;
      padding-right: var(--stack-space);
      margin: 0 auto 64px;
    }
    .teacher-flip-deck .flip-teacher-card {
      position: relative;
      grid-area: 1 / 1;
      width: 100%;
      min-width: 0;
      min-height: 466px;
      padding: 1.75rem;
      display: flex;
      flex-direction: column;
      cursor: pointer;
      user-select: none;
      transform-origin: 50% 50%;
      transition: transform .52s cubic-bezier(.22,.72,.2,1), opacity .36s ease, box-shadow .36s ease;
    }
    .teacher-flip-deck .flip-teacher-card[data-position="0"] {
      z-index: 3;
      transform: translate(0, 0) rotate(0deg);
      opacity: 1;
      box-shadow: 0 16px 36px rgba(36, 74, 120, .18);
    }
    .teacher-flip-deck .flip-teacher-card[data-position="1"] {
      z-index: 2;
      transform: translate(var(--stack-x), var(--stack-y)) rotate(var(--stack-angle)) scale(.99);
      opacity: 1;
      background: #f4f9ff;
      border-color: #b8d4ef;
      box-shadow: 0 8px 20px rgba(36, 74, 120, .14);
    }
    .teacher-flip-deck .flip-teacher-card[data-position="2"] {
      z-index: 1;
      transform: translate(calc(var(--stack-x) * 2), calc(var(--stack-y) * 2)) rotate(calc(var(--stack-angle) * 2)) scale(.98);
      opacity: 1;
      background: #e9f3ff;
      border-color: #a6c8e9;
      box-shadow: 0 8px 20px rgba(36, 74, 120, .12);
    }
    .teacher-flip-deck .flip-teacher-card[data-position]:not([data-position="0"]):not([data-position="1"]):not([data-position="2"]) {
      z-index: 0;
      transform: translate(calc(var(--stack-x) * 2), calc(var(--stack-y) * 2)) scale(.98);
      opacity: 0;
      pointer-events: none;
    }
    .teacher-flip-deck .flip-teacher-card:focus-visible { outline: 3px solid rgba(74, 144, 226, .45); outline-offset: 4px; }
    .teacher-flip-deck .teach-avatar { width: 138px; height: 138px; margin-top: .05rem; }
    .teacher-flip-deck .teach-name { font-size: 1.4rem; font-weight: 800; }
    .teacher-flip-deck .teach-school { margin-top: .25rem; font-size: .92rem; }
    .teacher-flip-deck .teach-school--mason { color: #006633; }
    .teacher-flip-deck .teach-school--utah { color: #cc0000; }
    .teacher-flip-deck .teach-major { margin: .1rem 0 0; font-size: .92rem; }
    .hero-teacher-bio {
      min-height: 110px;
      margin: .7rem 0 0;
      color: var(--dark-gray);
      font-size: .92rem;
      line-height: 1.55;
      text-align: left;
    }
    .teacher-flip-deck .teach-tags { min-height: 29px; margin-top: 0; padding-top: .45rem; align-items: center; }
    .teacher-flip-deck .flip-teacher-hint {
      margin-top: .55rem;
      padding-top: .45rem;
      border-top: 1px solid var(--border);
      color: var(--gray);
      font-size: .72rem;
      line-height: 1.3;
      text-align: right;
    }

    .application-path-dialog {
      width: min(calc(100% - 2rem), 560px);
      max-width: 560px;
      padding: 0;
      border: 0;
      border-radius: 1.65rem;
      background: transparent;
      color: var(--black);
      box-shadow: 0 28px 80px rgba(22, 50, 79, .26);
    }
    .application-path-dialog::backdrop { background: rgba(16, 24, 40, .58); backdrop-filter: blur(4px); }
    .application-path-dialog__surface { position: relative; padding: 2rem; border-radius: 1.65rem; background: #fff; }
    .application-path-dialog__close {
      position: absolute;
      top: .9rem;
      right: .9rem;
      width: 44px;
      height: 44px;
      border: 0;
      border-radius: 50%;
      background: #eef3f8;
      color: #23364b;
      font: 700 1.55rem/1 'Pretendard', sans-serif;
      cursor: pointer;
    }
    .application-path-dialog h2 { padding-right: 2.8rem; font-size: 1.75rem; line-height: 1.3; }
    .application-path-dialog__intro { margin: .6rem 0 1.35rem; color: #617086; font-size: 1rem; line-height: 1.55; }
    .application-path-dialog__options { display: grid; gap: .75rem; }
    .application-path-dialog__option {
      display: grid;
      gap: .25rem;
      min-height: 92px;
      padding: 1.1rem 1.2rem;
      border: 1.5px solid #d6e3f2;
      border-radius: 1.1rem;
      color: #183b60;
      text-decoration: none;
      background: #fff;
      transition: border-color .18s ease, background .18s ease, transform .18s ease;
    }
    .application-path-dialog__option:hover { border-color: var(--accent); background: #f3f8ff; transform: translateY(-1px); }
    .application-path-dialog__option:focus-visible,
    .application-path-dialog__close:focus-visible { outline: 3px solid #1d4ed8; outline-offset: 3px; }
    .application-path-dialog__option strong { font-size: 1.2rem; font-weight: 850; }
    .application-path-dialog__option span { color: #617086; font-size: .94rem; line-height: 1.5; }

    .scroll-hint { position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 0.5rem; font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gray); animation: bounce 2s infinite; }
    .scroll-hint::after { content: '↓'; font-size: 1.2rem; color: var(--accent); }
    @keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(6px); } }

    /* STATS STRIP (kimstudy-style trust row) */
    .stats-strip { padding: 3.25rem 3rem 0.5rem; max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
    .stat-card { text-align: center; padding: 1.2rem; }
    .stat-num { font-family: 'Pretendard', sans-serif; font-size: 2.6rem; font-weight: 900; color: var(--navy); margin-bottom: 0.4rem; letter-spacing: -0.02em; }
    .stat-num em { font-style: normal; color: var(--accent); }
    .stat-label { font-size: 0.95rem; color: var(--dark-gray); font-weight: 400; }

    /* SECTION COMMON */
    section { padding: 4.75rem 3rem; }
    .section-label { font-size: 0.82rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--accent); font-weight: 700; display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1.2rem; justify-content: center; }
    .section-label::after { content: ''; flex: 0 0 40px; height: 1px; background: var(--accent); }
    .section-title { font-family: 'Pretendard', sans-serif; font-size: clamp(2.1rem, 4vw, 3.1rem); font-weight: 800; line-height: 1.35; letter-spacing: -0.02em; margin-bottom: 1rem; text-align: center; }
    .section-title em { font-style: normal; color: var(--accent); }
    .section-sub { text-align: center; color: var(--dark-gray); font-size: 1.05rem; font-weight: 400; max-width: 620px; margin: 0 auto 2.75rem; line-height: 1.7; }

    /* VERIFICATION */
    .verify-card { background: var(--cream); border: 1px solid var(--border); border-radius: 1.5rem; padding: 2.4rem; }
    .verify-num { width: 40px; height: 40px; border-radius: 50%; background: var(--accent-light); color: var(--accent-deep); font-weight: 900; display: flex; align-items: center; justify-content: center; margin-bottom: 1.2rem; }
    .verify-title { font-family: 'Pretendard', sans-serif; font-weight: 800; font-size: 1.15rem; margin-bottom: 0.7rem; }
    .verify-desc { font-size: 0.98rem; color: var(--dark-gray); line-height: 1.7; font-weight: 400; }

    /* WHY */
    .why-section { background: var(--navy); text-align: center; }
    .why-section .section-label { color: rgba(255,255,255,0.6); }
    .why-section .section-label::after { background: rgba(255,255,255,0.6); }
    .why-section .section-title { color: var(--white); }
    .why-section .section-title em { color: #8FC1FF; }
    .why-section .section-sub { color: rgba(255,255,255,0.75); }
    .why-points { display: flex; justify-content: center; gap: 2.5rem; flex-wrap: wrap; margin-top: 2.5rem; }
    .why-point { max-width: 220px; }
    .why-point-icon { font-size: 2rem; margin-bottom: 0.8rem; }
    .why-point-title { color: var(--white); font-weight: 800; font-size: 0.98rem; margin-bottom: 0.4rem; }
    .why-point-desc { color: rgba(255,255,255,0.72); font-size: 0.95rem; line-height: 1.65; }
    
    /* FEATURES */
    .features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; max-width: 1200px; margin: 0 auto; }
    .feature-card { background: var(--cream); border: 1px solid var(--border); border-radius: 1.4rem; padding: 1.7rem 1.4rem; transition: transform 0.3s, box-shadow 0.3s; text-align: center; }
    .feature-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(74, 144, 226, 0.15); }
    .feature-icon { font-size: 2.4rem; margin-bottom: 0.9rem; }
    .feature-title { font-family: 'Pretendard', sans-serif; font-weight: 800; font-size: 1.25rem; margin-bottom: 0.6rem; }
    .feature-desc { font-size: 1rem; color: var(--dark-gray); line-height: 1.6; font-weight: 400; }

    /* TEACHERS TOP3 */
    .teachers-section { background: var(--cream); }
    .teach-grid { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
    .teach-card { background: var(--white); border: 1px solid var(--border); border-radius: 1.5rem; padding: 2.2rem; text-align: center; position: relative; }
    .rank-badge { position: absolute; top: 1.3rem; left: 1.3rem; background: var(--navy); color: var(--white); font-size: 0.72rem; font-weight: 700; padding: 0.3rem 0.8rem; border-radius: 1rem; }
    .teach-avatar { width: 170px; height: 170px; border-radius: 50%; background: var(--accent-light); color: var(--accent-deep); display: flex; align-items: center; justify-content: center; font-size: 2.1rem; font-weight: 900; margin: 1.2rem auto 1rem; border: 2px solid var(--accent); overflow: hidden; }
    .teach-school { font-size: 0.82rem; color: var(--accent-deep); font-weight: 700; margin-bottom: 0.2rem; }
    .teach-major { font-size: 0.82rem; color: var(--gray); margin-bottom: 1rem; }
    .teach-tags { display: flex; gap: 0.4rem; justify-content: center; flex-wrap: wrap; }

    /* HOW */
    .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; max-width: 1100px; margin: 0 auto; }
    .step { padding: 2.5rem; border: 1px solid var(--border); border-radius: 1.5rem; transition: box-shadow 0.3s, transform 0.3s; background: var(--white); }
    .step:hover { box-shadow: 0 16px 40px rgba(74, 144, 226, 0.12); transform: translateY(-4px); }
    .step-num { font-family: 'Pretendard', sans-serif; font-size: 3.5rem; font-weight: 800; color: var(--accent); line-height: 1; margin-bottom: 1.2rem; }
    .step-title { font-family: 'Pretendard', sans-serif; font-weight: 800; font-size: 1.15rem; margin-bottom: 0.6rem; }
    .step-desc {
      font-size: 0.98rem;
      color: var(--dark-gray);
      line-height: 1.7;
      font-weight: 400;
      word-break: keep-all;
      overflow-wrap: break-word;
      text-wrap: pretty;
    }

    /* PRICE */
    .price-section { background: var(--navy); }
    .price-section .section-label, .price-section .section-title { color: var(--white); }
    .price-section .section-label { color: rgba(255,255,255,0.7); }
    .price-section .section-label::after { background: rgba(255,255,255,0.7); }
    .price-layout { max-width: 760px; margin: 0 auto; background: rgba(255,255,255,0.05); border-radius: 2rem; padding: 3rem; border: 1px solid rgba(255,255,255,0.1); }
    .price-header { text-align: center; margin-bottom: 2.5rem; }
    .price-amount { font-family: 'Pretendard', sans-serif; font-size: 3.4rem; letter-spacing: -0.02em; font-weight: 900; color: var(--white); margin-bottom: 0.5rem; }
    .price-period { font-size: 1rem; color: rgba(255,255,255,0.7); }
    .price-features { display: flex; flex-direction: column; gap: 1.3rem; margin-bottom: 2rem; }
    .price-feature { display: flex; align-items: flex-start; gap: 1rem; color: rgba(255,255,255,0.9); font-size: 0.95rem; }
    .price-feature strong { color: var(--white); }
    .tier-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; max-width: 1000px; margin: 0 auto; }
    .tier-card { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12); border-radius: 1.6rem; padding: 2.2rem 1.8rem; position: relative; }
    .tier-card.popular { background: var(--accent); border-color: var(--accent); transform: scale(1.04); }
    .tier-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--white); color: var(--accent); font-size: 0.72rem; font-weight: 800; padding: 0.3rem 0.9rem; border-radius: 1rem; white-space: nowrap; }
    .tier-name { color: rgba(255,255,255,0.7); font-size: 0.85rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 0.8rem; }
    .tier-card.popular .tier-name { color: rgba(255,255,255,0.9); }
    .tier-price { font-size: 2.2rem; font-weight: 900; color: var(--white); letter-spacing: -0.02em; white-space: nowrap; }
    .tier-period { font-size: 0.78rem; color: rgba(255,255,255,0.6); margin-bottom: 1.2rem; }
    .tier-card.popular .tier-period { color: rgba(255,255,255,0.85); }
    .tier-period,
    .tier-desc,
    .tier-features li {
      word-break: keep-all;
      overflow-wrap: break-word;
      text-wrap: pretty;
    }
    .tier-desc { font-size: 0.85rem; color: rgba(255,255,255,0.75); line-height: 1.6; margin-bottom: 1.4rem; min-height: 3.4rem; }
    .tier-card.popular .tier-desc { color: rgba(255,255,255,0.92); }
    .tier-features { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; margin-bottom: 1.6rem; }
    .tier-features li { font-size: 0.82rem; color: rgba(255,255,255,0.8); padding-left: 1.2rem; position: relative; }
    .tier-card.popular .tier-features li { color: rgba(255,255,255,0.95); }
    .tier-features li::before { content: '✓'; position: absolute; left: 0; color: #8FC1FF; font-weight: 800; }
    .tier-card.popular .tier-features li::before { color: var(--white); }
    .tier-cta { display: block; text-align: center; background: rgba(255,255,255,0.1); color: var(--white); padding: 0.85rem; border-radius: 3rem; font-weight: 700; font-size: 0.9rem; text-decoration: none; }
    .tier-card.popular .tier-cta { background: var(--white); color: var(--accent-deep); }
    /* REVIEW */
    .review-section { text-align: center; background: var(--white); }
    .review-avatar { width: 90px; height: 90px; border-radius: 50%; background: var(--accent-light); display: flex; align-items: center; justify-content: center; font-size: 2.6rem; margin: 0 auto 1.6rem; }
    .review-quote { font-family: 'Pretendard', sans-serif; font-size: clamp(1.3rem, 2.6vw, 1.9rem); font-weight: 800; line-height: 1.5; color: var(--black); max-width: 640px; margin: 0 auto 1.2rem; }
    .review-quote span { color: var(--accent); }
    .review-by { font-size: 0.9rem; color: var(--gray); font-weight: 600; margin-bottom: 1rem; }
    .review-note { font-size: 0.85rem; color: var(--gray); opacity: 0.8; }

    /* FINAL CTA */
    .cta-section { background: var(--accent); color: var(--white); text-align: center; padding: 5.5rem 3rem; }
    .cta-section .section-label { color: rgba(255,255,255,0.8); justify-content: center; }
    .cta-section .section-label::after { background: rgba(255,255,255,0.8); }
    .cta-title { font-family: 'Pretendard', sans-serif; font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 900; line-height: 1.2; letter-spacing: -0.03em; margin-bottom: 1.2rem; color: var(--white); }
    .cta-title em { font-style: normal; color: rgba(255,255,255,0.9); }
    .cta-sub { font-size: 1.05rem; color: rgba(255,255,255,0.85); font-weight: 300; margin-bottom: 2.4rem; }
    .cta-section .btn-primary { background: var(--white); color: var(--accent); }

    /* FOOTER */
    footer { background: var(--black); padding: 3rem 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
    .footer-logo { font-family: 'Pretendard', sans-serif; font-weight: 900; font-size: 1.3rem; color: var(--white); }
    .footer-logo span { color: var(--accent); }
    .footer-info { display: flex; flex-direction: column; gap: 0.4rem; align-items: flex-end; }
    .footer-text { font-size: 0.8rem; color: rgba(255,255,255,0.4); }
    .footer-text a { color: inherit; }

    /* ANIMATIONS */
    .fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
    .fade-in.visible { opacity: 1; transform: translateY(0); }

    /* MOBILE */
    @media (max-width: 900px) {
      nav { padding: 1rem 1.5rem; }
      .nav-links { display: none; }
      .nav-toggle { display: block; }
      .nav-links.mobile-open {
        display: flex !important;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        height: 100vh;
        z-index: 90;
        background: var(--white);
        flex-direction: column;
        padding: 6rem 2rem 2rem;
        gap: 0;
        overflow-y: auto;
      }
      .nav-links.mobile-open li { border-bottom: 1px solid var(--border); }
      .nav-links.mobile-open li a:not(.nav-cta) { display: block; padding: 1.4rem 0.2rem; font-size: 1.15rem; font-weight: 700; color: var(--black); }
      .nav-links.mobile-open li:last-child { border-bottom: none; margin-top: 1.5rem; }
      .nav-links.mobile-open .nav-cta { display: block; text-align: center; padding: 1.2rem; font-size: 1.15rem !important; }
      .nav-links.mobile-open li:has(.nav-cta) {
        order: 1;
        margin-top: 1rem;
      }
      
      .nav-links.mobile-open li:has(.nav-trial) {
        order: 2;
        margin-top: 0.75rem;
      }
      .hero { padding: 7rem 1.25rem 3.25rem; }
      .hero-inner { grid-template-columns: 1fr; gap: 2.5rem; }
      .hero-left { padding: 0; }
      .hero-right { min-height: 320px; }
      section { padding: 3.5rem 1.25rem; }
      .teach-grid.mobile-teacher-marquee { display: block; max-width: none; overflow: hidden; margin-left: -1.5rem; margin-right: -1.5rem; }
      .mobile-teacher-track { display: flex; width: max-content; animation: teacherMarquee 24s linear infinite; }
      .mobile-teacher-group { display: flex; gap: 1rem; padding-right: 1rem; }
      .mobile-teacher-group .teach-card { width: 270px; flex: 0 0 270px; }
      .mobile-teacher-group .teach-avatar { width: 130px; height: 130px; }
      .mobile-teacher-group .fade-in { opacity: 1; transform: none; }
      .stats-strip { grid-template-columns: repeat(2, 1fr); padding: 2.75rem 1.25rem 0; }
      .verify-grid, .teach-grid, .steps-grid, .tier-grid { grid-template-columns: 1fr; }
      .tier-card.popular { transform: none; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .cta-section { padding: 4.25rem 1.25rem; }
      .footer-info { align-items: center; }
      footer { flex-direction: column; text-align: center; }
    }
    @keyframes teacherMarquee { to { transform: translateX(-50%); } }
    @media (prefers-reduced-motion: reduce) {
      .mobile-teacher-track { animation-play-state: paused; }
    }
    @media (max-width: 480px) {
      .stats-strip { grid-template-columns: 1fr 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .price-layout { padding: 2rem 1.4rem; }
    }

    /* RESPONSIVE SYSTEM — fluid scale + layout-specific breakpoints */
    :root {
      --content-wide: 1240px;
      --content-standard: 1120px;
      --page-gutter: clamp(1.5rem, 4vw, 3.5rem);
      --section-space: clamp(4.25rem, 6.3vw, 5.75rem);
      --body-size: clamp(1rem, 0.35vw + 0.92rem, 1.12rem);
      --small-size: clamp(0.88rem, 0.2vw + 0.83rem, 0.98rem);
    }
    body { font-size: 16px; }
    nav { padding: 1.05rem var(--page-gutter); }
    .nav-links { gap: clamp(1.15rem, 2vw, 2rem); }
    .nav-links a { font-size: clamp(.9rem, .25vw + .82rem, 1rem); }
    .nav-links a[style] { font-size: .9rem !important; }

    .hero {
      padding: clamp(8rem, 10vw, 9.5rem) var(--page-gutter) clamp(4.5rem, 6vw, 5.5rem);
    }
    .hero-inner {
      max-width: 1040px;
      grid-template-columns: minmax(0, 1fr) minmax(340px, .78fr);
      gap: clamp(1rem, 2vw, 1.75rem);
    }
    .hero-title {
      max-width: 760px;
      font-size: clamp(3.25rem, 5.3vw, 4.9rem);
      line-height: 1.08;
      text-wrap: balance;
    }
    .hero-title .title-line { display: block; }
    .hero-tag { font-size: clamp(1rem, 1.2vw, 1.3rem); margin-bottom: clamp(1.25rem, 2vw, 1.8rem); }
    .hero-sub {
      max-width: 590px;
      font-size: var(--body-size);
      line-height: 1.72;
      word-break: keep-all;
    }
    .hero-sub .copy-line { display: block; }
    .hero-sub .copy-line + .copy-line { margin-top: .9rem; }
    .hero-micro { font-size: var(--small-size); }

    section { padding: var(--section-space) var(--page-gutter); }
    .features-grid, .why-points, .steps-grid, .teach-grid, .tier-grid { width: 100%; }
    .features-grid {
      max-width: var(--content-standard);
      grid-template-columns: repeat(4, 260px);
      justify-content: center;
      gap: 1.25rem;
    }
    .why-points { max-width: 980px; margin-left: auto; margin-right: auto; }
    .section-title {
      font-size: clamp(2.2rem, 3.6vw, 3.25rem);
      line-height: 1.24;
      text-wrap: balance;
      word-break: keep-all;
    }
    .section-sub {
      max-width: 680px;
      font-size: var(--body-size);
      line-height: 1.72;
      text-wrap: pretty;
      word-break: keep-all;
    }
    .section-sub .copy-sentence + .copy-sentence::before { content: ' '; }
    .feature-card { padding: clamp(1.7rem, 2.2vw, 2.1rem) clamp(1.35rem, 1.8vw, 1.7rem); }
    .feature-title { font-size: clamp(1.2rem, .7vw + 1rem, 1.4rem); }
    .feature-desc, .verify-desc, .step-desc, .why-point-desc { font-size: clamp(.96rem, .25vw + .9rem, 1.05rem); }
    .step { padding: clamp(1.8rem, 2.8vw, 2.5rem); }
    .teach-card { padding: clamp(1.8rem, 2.5vw, 2.2rem); }
    .tier-card { padding: clamp(1.8rem, 2.2vw, 2.3rem) clamp(1.4rem, 2vw, 1.9rem); }
    .tier-desc, .tier-name { font-size: .95rem; }
    .tier-features li { font-size: .92rem; line-height: 1.55; }
    .review-quote { max-width: 760px; font-size: clamp(1.45rem, 2.3vw, 2rem); text-wrap: balance; word-break: keep-all; }
    .cta-title { font-size: clamp(2.6rem, 4.5vw, 3.8rem); text-wrap: balance; }
    .cta-title .title-line { display: block; }
    .cta-sub { font-size: var(--body-size); }

    @media (min-width: 820px) and (max-width: 1199px) {
      .features-grid { grid-template-columns: repeat(2, 360px); max-width: 760px; }
    }

    /* Compact desktop / laptop */
    @media (max-width: 1099px) {
      :root { --page-gutter: clamp(1.75rem, 4vw, 2.75rem); --section-space: clamp(4rem, 6.5vw, 5rem); }
      .hero-inner { grid-template-columns: minmax(0, 1.12fr) minmax(290px, .75fr); gap: 2rem; }
      .hero-title { font-size: clamp(3.15rem, 5.6vw, 4rem); }
      .features-grid { grid-template-columns: repeat(2, 360px); max-width: 760px; }
      .feature-card { text-align: left; }
      .feature-icon { font-size: 2.15rem; }
      .tier-grid { gap: 1rem; }
      .tier-price { font-size: 1.9rem; }
    }

    /* Tablet: switch composition before cards become cramped */
    @media (max-width: 900px) {
      :root { --page-gutter: clamp(1.5rem, 5vw, 2.5rem); }
      nav { padding: .9rem var(--page-gutter); }
      .hero { padding-top: 7.25rem; }
      .hero-inner { grid-template-columns: minmax(0, 1fr); gap: 2.25rem; }
      .hero-left { align-items: center; text-align: center; }
      .hero-title { max-width: 720px; }
      .hero-sub { max-width: 660px; }
      .hero-buttons { justify-content: center; }
      .hero-right { min-height: 350px; }
      .stats-strip { max-width: 760px; gap: .75rem; }
      .stat-card { padding: 1rem .75rem; }
      .steps-grid { gap: 1rem; }
      .step { padding: 1.7rem; }
      .step-num { font-size: 2.8rem; }
      .tier-grid { grid-template-columns: 1fr; max-width: 640px; gap: 1.2rem; }
      .tier-card { min-height: auto; }
      .tier-card.popular { transform: none; }
    }

    /* Portrait tablet: reading-first single-column sections */
    @media (max-width: 819px) {
      .features-grid { grid-template-columns: minmax(0, 660px); max-width: 660px; }
      .steps-grid { grid-template-columns: 1fr; max-width: 680px; }
      .step { display: grid; grid-template-columns: 72px 1fr; column-gap: 1.2rem; align-items: start; }
      .step-num { grid-row: 1 / span 2; margin-bottom: 0; }
      .step-title { margin-top: .15rem; }
      .why-points { display: grid; grid-template-columns: 1fr; max-width: 660px; gap: .8rem; }
      .why-point { max-width: none; display: grid; grid-template-columns: 48px 1fr; column-gap: 1rem; text-align: left; padding: 1rem 1.1rem; border-radius: 1rem; background: rgba(255,255,255,.05); }
      .why-point-icon { grid-row: 1 / span 2; margin: 0; }
      .why-point-title { margin-top: .1rem; }
      .teach-grid.mobile-teacher-marquee { margin-left: calc(var(--page-gutter) * -1); margin-right: calc(var(--page-gutter) * -1); }
    }

    /* Mobile */
    @media (max-width: 599px) {
      :root { --page-gutter: 1.25rem; --section-space: clamp(3.5rem, 15vw, 4.25rem); }
      .hero { padding: 5.75rem var(--page-gutter) 1.5rem; }
      .hero-inner { gap: 0; }
      .hero-left { align-items: flex-start; text-align: left; }
      .hero-tag { font-size: .95rem; letter-spacing: .08em; margin-bottom: .75rem; }
      .hero-tag::before { width: 18px; }
      .hero-title { font-size: clamp(2.75rem, 12vw, 3.35rem); line-height: 1.08; margin-bottom: .9rem; }
      .hero-title .title-line { display: block; }
      .hero-title .title-line:first-child::after { content: none; }
      .hero-sub { font-size: 1.05rem; line-height: 1.68; margin-bottom: 1.1rem; }
      .hero-sub .copy-line + .copy-line { margin-top: .55rem; }
      .hero-buttons { width: auto; display: flex; flex-flow: row nowrap; gap: .8rem; }
      .hero-buttons .btn-primary { width: auto; min-height: auto; display: inline-block; padding: .9rem 1.65rem; text-align: center; }
      .hero-buttons .btn-text { width: auto; min-height: auto; height: 48px; display: inline-flex; align-items: center; padding: 0 1.35rem; border: 1.5px solid rgba(74, 144, 226, .28); border-radius: 3rem; background: rgba(255,255,255,.82); text-decoration: none; }
      .hero-buttons { flex-direction: column; align-items: flex-start; }
      .trial-cta-wrap { align-items: center; gap: .55rem; }
      .trial-event-bubble {
        position: relative; left: auto; bottom: auto; transform: none; order: 2;
        padding: .42rem .62rem; font-size: .7rem;
      }
      .trial-event-bubble::after {
        top: 50%; left: auto; right: 100%; transform: translateY(-50%);
        border-top-color: transparent; border-right-color: #FF6B5F;
      }
      .hero-micro { width: auto; margin-top: .65rem; margin-bottom: .75rem; text-align: left; font-size: .86rem; }
      .hero-right { min-height: 0; }
      .hero-teacher-carousel-shell { width: min(360px, 100%); }
      .teacher-flip-deck {
        --stack-x: 18px;
        --stack-y: 14px;
        --stack-angle: 2.5deg;
        --stack-space: 60px;
        margin-bottom: 52px;
      }
      .teacher-flip-deck .flip-teacher-card { min-height: 426px; padding: 1.05rem; border-radius: 1.25rem; }
      .teacher-flip-deck .teach-avatar { width: 170px; height: 170px; margin: 0 auto .45rem; }
      .teacher-flip-deck .teach-name { font-size: 1.22rem; margin-bottom: .15rem; }
      .teacher-flip-deck .teach-school,
      .teacher-flip-deck .teach-major { font-size: .84rem; line-height: 1.35; }
      .teacher-flip-deck .teach-major { margin-bottom: 0; }
      .hero-teacher-bio { min-height: 82px; margin: .55rem 0 0; font-size: .84rem; line-height: 1.45; }
      .teacher-flip-deck .tag { padding: .23rem .55rem; font-size: .76rem; }
      .teacher-flip-deck .teach-tags { min-height: 27px; padding-top: 0; }
      .teacher-flip-deck .flip-teacher-hint { font-size: .68rem; }
      .stats-strip { padding: 2.5rem var(--page-gutter) .25rem; gap: .35rem; }
      .stat-card { padding: .9rem .35rem; }
      .stat-num { font-size: clamp(1.65rem, 8vw, 2.1rem); }
      .stat-label { font-size: .86rem; line-height: 1.45; word-break: keep-all; }
      .section-label { margin-bottom: 1rem; }
      .section-title { font-size: clamp(2rem, 9.5vw, 2.55rem); line-height: 1.2; }
      .section-sub { margin-bottom: 2.25rem; font-size: 1rem; }
      .features-grid { grid-template-columns: minmax(0, 1fr); max-width: 390px; gap: .9rem; justify-items: center; }
      .feature-card { display: grid; width: min(100%, 344px); grid-template-columns: 40px minmax(0, 1fr); column-gap: .9rem; align-items: start; text-align: left; padding: 1.15rem 1.25rem; min-width: 0; }
      .feature-icon { grid-row: 1 / span 2; width: 40px; margin: 0; font-size: 1.85rem; line-height: 1.2; text-align: center; justify-self: center; }
      .feature-title { margin: 0 0 .35rem; min-width: 0; line-height: 1.3; }
      .feature-desc { width: 100%; max-width: none; min-width: 0; line-height: 1.58; }
      .economy-desc-line { display: block; }
      .step { grid-template-columns: 58px 1fr; padding: 1.35rem; }
      .step-num { font-size: 2.25rem; }
      .mobile-teacher-group .teach-card { width: min(78vw, 300px); flex-basis: min(78vw, 300px); }
      .tier-price { font-size: clamp(1.8rem, 8vw, 2.2rem); }
      .review-quote { font-size: clamp(1.35rem, 6.4vw, 1.65rem); }
      .cta-section { padding: 4rem var(--page-gutter); }
      footer { padding: 2.5rem var(--page-gutter); }
      .footer-text { font-size: .86rem; line-height: 1.55; }
      .application-path-dialog__surface { padding: 1.5rem 1.1rem 1.15rem; }
      .application-path-dialog h2 { font-size: 1.48rem; }
      .application-path-dialog__option { min-height: 88px; padding: 1rem; }
    }

    /* Small phones: prevent awkward orphan words and card collisions */
    @media (max-width: 390px) {
      :root { --page-gutter: 1.1rem; }
      .hero-title { font-size: clamp(2.55rem, 12vw, 2.9rem); }
      .hero-title .title-line { display: block; }
      .hero-title .title-line:first-child::after { content: none; }
      .stats-strip { grid-template-columns: 1fr 1fr; }
      .stat-label { font-size: .82rem; }
      .section-title { font-size: 2rem; }
    }

    @media (max-width: 350px) {
      .hero-buttons { width: 100%; }
      .hero-buttons .btn-primary { max-width: 100%; }
      .trial-cta-wrap {
        display: grid;
        width: 100%;
        grid-template-columns: minmax(0, 1fr) auto;
        gap: .4rem;
      }
      .hero-buttons .btn-text {
        width: 100%;
        min-width: 0;
        padding-inline: .75rem;
        font-size: .9rem;
        white-space: nowrap;
      }
      .trial-event-bubble { max-width: 100%; padding: .38rem .48rem; font-size: .64rem; }
      .feature-card { grid-template-columns: minmax(0, 1fr); row-gap: .35rem; }
      .feature-icon { grid-row: auto; margin-bottom: .2rem; }
      .feature-title { margin: 0; }
      .feature-desc { max-width: none; }
    }

  
.application-path-dialog { position:fixed; inset:0; margin:auto; max-height:calc(100dvh - 2rem); overflow:auto; }