:root{--bg:#f4f6fb;--card:#fff;--ink:#172033;--muted:#667085;--line:#dfe4ee;--accent:#155eef;--danger:#b42318;--ok:#067647}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--ink)}a{color:var(--accent);text-decoration:none}.wrap{max-width:1120px;margin:0 auto;padding:28px 18px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.brand{font-weight:800;font-size:22px}.sub{color:var(--muted);font-size:14px;margin-top:4px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;margin:14px 0;box-shadow:0 10px 30px rgba(16,24,40,.06)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}.form{display:grid;gap:10px}.form label{font-size:13px;color:var(--muted);font-weight:700}.form input,.form select,.form textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:11px 12px;font-size:15px;background:#fff}.btn,button{border:0;border-radius:12px;padding:11px 15px;background:var(--accent);color:#fff;font-weight:800;cursor:pointer}.btn.secondary,button.secondary{background:#344054}.btn.light,button.light{background:#edf2ff;color:#173b80}.btn.danger,button.danger{background:var(--danger)}.hidden{display:none!important}.msg,.status{font-size:14px;color:var(--muted);white-space:pre-wrap}.book-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.book-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;gap:8px;background:#fff;color:var(--ink);border:1px solid var(--line);min-height:110px}.book-card strong{font-size:17px}.book-card span{color:var(--muted);font-size:13px}.viewer{width:100%;height:78vh;border:1px solid var(--line);border-radius:16px;background:white}.empty{padding:24px;border:1px dashed var(--line);border-radius:14px;color:var(--muted)}.out{background:#101828;color:#f2f4f7;border-radius:14px;padding:14px;min-height:90px;overflow:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;white-space:pre-wrap}.notice{border-left:4px solid var(--accent);padding:10px 12px;background:#eef4ff;border-radius:10px;color:#1d2939;font-size:14px}.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:760px){.two{grid-template-columns:1fr}.topbar{align-items:flex-start;flex-direction:column}.viewer{height:72vh}}
.wrap.wide{max-width:1320px}.two-cols{grid-template-columns:repeat(auto-fit,minmax(420px,1fr))}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:14px 0}.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:0 10px 30px rgba(16,24,40,.05)}.stat b{display:block;font-size:28px;color:var(--accent)}.stat span{color:var(--muted);font-size:13px;font-weight:700}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.tab{background:#edf2ff;color:#173b80}.tab.active{background:var(--accent);color:#fff}.tableWrap{overflow:auto;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;background:#fff;font-size:13px}th,td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top;white-space:nowrap}th{background:#f8fafc;color:#475467;font-weight:800}hr{border:0;border-top:1px solid var(--line);margin:18px 0}@media(max-width:760px){.two-cols{grid-template-columns:1fr}th,td{white-space:normal}}

/* GYO6 portal visual alignment */
:root {
  --bg: #f7fbfa;
  --card: #fff;
  --ink: #142234;
  --text: #142234;
  --muted: #53646b;
  --line: #dfe9e6;
  --accent: #16806f;
  --accent-dark: #0f665b;
  --accent-soft: #eef8f5;
  --navy: #142234;
  --warm: #8a5a00;
  --danger: #b42318;
  --ok: #067647;
}

body {
  background: linear-gradient(180deg, #eef8f5 0, #f7fbfa 310px, #f7fbfa 100%);
  color: var(--ink);
  word-break: keep-all;
}

.wrap {
  max-width: 1180px;
  padding: 24px 20px 34px;
}

.app-topbar {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto minmax(190px, 1fr);
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 14px 36px rgba(47, 103, 96, .08);
  backdrop-filter: blur(8px);
}

.portal-main-brand {
  color: var(--ink);
}

.portal-main-brand .brand-mark {
  background: linear-gradient(135deg, rgba(255, 255, 255, .72), rgba(255, 255, 255, 0) 48%),
    conic-gradient(from 30deg, #0f6f62, #73b8a6, #d8f1e9, #3974a6, #0f6f62);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .78), 0 8px 20px rgba(23, 34, 49, .12);
}

.portal-main-brand .brand {
  font-size: 16px;
}

.portal-main-brand .sub {
  font-size: 11.5px;
  letter-spacing: .02em;
}

.portal-main-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 5px;
}

.portal-main-menu a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 9px;
  color: #26394c;
  font-size: 13px;
  font-weight: 850;
  text-decoration: none;
  white-space: nowrap;
}

.portal-main-menu a:hover,
.portal-main-menu a.active {
  background: var(--navy);
  color: #fff;
}

.brand-lockup {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-lockup > div {
  min-width: 0;
}

.brand-mark {
  display: inline-grid;
  flex: 0 0 auto;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, #58a99c, #142234);
  font-weight: 900;
}

.brand {
  color: var(--ink);
  line-height: 1.25;
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.portal-main-actions {
  align-items: center;
  justify-content: flex-end;
}

.portal-login-link {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--navy);
}

.portal-owner-link {
  border: 1px solid #d3e9e3;
  background: #eef8f5;
  color: #0b6e61;
}

.section-kicker {
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.card {
  border-color: var(--line);
  border-radius: 12px;
  box-shadow: 0 16px 38px rgba(47, 103, 96, .08);
}

.btn,
button {
  border-radius: 10px;
  background: var(--accent);
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease;
}

.btn:hover,
button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(22, 128, 111, .16);
}

.btn.secondary,
button.secondary {
  background: var(--navy);
}

.btn.light,
button.light,
.tab {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.tab.active {
  background: var(--accent);
  color: #fff;
}

.portal-link {
  border: 1px solid #cfe6df;
}

.form input,
.form select,
.form textarea {
  border-color: #d6e6e2;
  border-radius: 10px;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: 3px solid rgba(22, 128, 111, .15);
  border-color: #83c5ba;
}

.login-body {
  min-height: 100vh;
}

.login-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.login-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .78fr);
  gap: 18px;
  align-items: stretch;
}

.login-hero-panel,
.library-hero-panel {
  position: relative;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 16px 38px rgba(47, 103, 96, .08);
}

.login-hero-panel {
  display: grid;
  grid-template-rows: auto auto auto;
  gap: 12px;
  padding: 20px;
}

.login-hero-panel h1,
.library-hero-panel h1 {
  margin: 0;
  color: var(--ink);
  font-size: 28px;
  line-height: 1.28;
  letter-spacing: 0;
}

.login-hero-panel p,
.library-hero-panel p {
  max-width: 620px;
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.62;
}

.login-feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.login-feature-list span {
  padding: 6px 10px;
  border: 1px solid #d9ebe6;
  border-radius: 999px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: 12px;
  font-weight: 900;
}

.portal-image-card,
.library-hero-image {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid #dcebe7;
  border-radius: 12px;
  background: #eaf7f4;
}

.portal-image-card img,
.library-hero-image img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
  object-position: center;
}

.login-hero-panel .portal-image-card img {
  height: 260px;
  min-height: 0;
}

.login-card {
  align-self: start;
  width: 100%;
  max-width: 430px;
  margin: 0;
}

.login-card.card {
  padding: 20px;
}

.login-card .notice {
  margin: 10px 0 0;
  line-height: 1.55;
}

.login-card h2,
.library-books-card h2 {
  margin-top: 0;
  color: var(--ink);
}

.notice {
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.login-preview-shelf {
  margin-top: 20px;
  scroll-margin-top: 18px;
}

.login-preview-note {
  margin: -4px 0 14px;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: var(--accent-soft);
  color: #284944;
  font-size: 14px;
  line-height: 1.65;
}

.login-preview-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.login-preview-book-card {
  color: var(--ink);
  text-decoration: none;
}

.library-wrap {
  max-width: 1220px;
}

.library-topbar {
  align-items: flex-start;
}

.library-hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 18px;
  align-items: center;
  padding: 20px;
  margin-bottom: 16px;
}

.library-hero-image img {
  min-height: 180px;
}

.library-books-card {
  margin-top: 0;
}

.book-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.book-card {
  border-color: #dcebe7;
  border-radius: 12px;
  background: #fbfdfc;
  box-shadow: none;
}

.book-card:hover {
  border-color: #9ecfc4;
  box-shadow: 0 14px 28px rgba(47, 103, 96, .1);
}

.library-modal {
  border-radius: 14px;
}

.library-learning-stats article,
.library-learning-row,
.library-profile-grid strong {
  border-color: #dcebe7;
  background: #fbfdfc;
}

@media (max-width: 900px) {
  .login-layout,
  .library-hero-panel {
    grid-template-columns: 1fr;
  }

  .login-card {
    max-width: none;
  }

  .library-user-panel {
    max-width: none;
  }
}

@media (max-width: 720px) {
  body {
    background: #f7fbfa;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .wrap {
    width: 100%;
    max-width: 100vw;
    padding: 14px 12px 24px;
    overflow-x: hidden;
  }

  .app-topbar,
  .login-layout,
  .login-hero-panel,
  .library-hero-panel,
  .card {
    width: 100%;
    max-width: calc(100vw - 32px);
    min-width: 0;
    margin-left: auto;
    margin-right: auto;
    border-radius: 12px;
  }

  .app-topbar {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .portal-main-menu {
    justify-content: flex-start;
  }

  .topbar-actions,
  .library-user-panel,
  .library-user-actions,
  .topbar-actions .btn,
  .library-user-actions .btn,
  .library-user-actions button {
    width: 100%;
    min-width: 0;
  }

  .brand,
  .sub,
  .status,
  .msg,
  .notice,
  .note-card,
  .login-hero-panel h1,
  .library-hero-panel h1,
  .login-hero-panel p,
  .library-hero-panel p,
  .login-card h2,
  .library-books-card h2,
  .login-feature-list span {
    max-width: 100%;
    white-space: normal;
    word-break: break-all;
    overflow-wrap: anywhere;
  }

  .login-feature-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .login-feature-list span {
    text-align: center;
  }

  .login-hero-panel {
    padding: 18px;
  }

  .login-hero-panel h1,
  .library-hero-panel h1 {
    font-size: 22px;
    line-height: 1.38;
  }

  .portal-image-card img,
  .library-hero-image img {
    min-height: 170px;
  }

  .login-hero-panel .portal-image-card img {
    height: 170px;
  }
}


/* V3.1 전체창 전자책 리더 */
.reader-full-body {
  margin: 0;
  background: #eef2f7;
  height: 100vh;
  overflow: hidden;
}
.reader-full-topbar {
  height: 64px;
  padding: 10px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: #fff;
  border-bottom: 1px solid #d9e2ec;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}
.reader-full-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.reader-full-frame {
  display: block;
  width: 100vw;
  height: calc(100vh - 64px);
  border: 0;
  background: #ddd;
}
.note-card {
  color: #475569;
  font-size: 14px;
}
.library-user-panel {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  max-width: 760px;
}
.library-user-summary {
  min-width: 0;
  text-align: right;
}
.library-user-summary strong,
.library-user-summary span {
  display: block;
}
.library-user-summary strong {
  font-size: 15px;
}
.library-user-summary span {
  max-width: 320px;
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 12px;
}
.library-user-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}
.library-user-actions .btn,
.library-user-actions button {
  min-height: 38px;
  padding: 9px 11px;
  font-size: 13px;
}
.library-modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, .42);
}
.library-modal-backdrop[hidden] {
  display: none;
}
.library-modal {
  width: min(680px, 100%);
  max-height: min(760px, calc(100vh - 36px));
  overflow: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 24px 80px rgba(15, 23, 42, .24);
}
.library-learning-modal {
  width: min(820px, 100%);
}
.library-modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}
.library-modal-head h2 {
  margin: 0;
  font-size: 20px;
}
.library-modal-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}
.library-profile-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.library-profile-grid label,
.library-profile-grid div {
  display: grid;
  gap: 6px;
}
.library-profile-grid span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.library-profile-grid strong {
  min-height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
  overflow-wrap: anywhere;
}
.library-profile-grid input,
.library-password-grid input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 15px;
  line-height: 1.35;
  background: #fff;
}
.library-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 14px;
}
.library-password-section {
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}
.library-password-section summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 900;
}
.library-password-section p {
  margin: 8px 0 12px;
  color: var(--muted);
  font-size: 13px;
}
.library-password-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.library-password-grid label {
  display: grid;
  gap: 6px;
}
.library-password-grid span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.library-learning-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.library-learning-stats article {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #f8fafc;
}
.library-learning-stats b {
  display: block;
  color: var(--accent);
  font-size: 24px;
}
.library-learning-stats span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.library-learning-list {
  display: grid;
  gap: 8px;
}
.library-learning-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
}
.library-learning-row strong,
.library-learning-row span {
  display: block;
}
.library-learning-row span {
  color: var(--muted);
  font-size: 12px;
}
.library-learning-progress {
  min-width: 120px;
  text-align: right;
}
@media (max-width: 720px) {
  .reader-full-topbar {
    height: 86px;
    align-items: flex-start;
    flex-direction: column;
  }
  .reader-full-frame {
    height: calc(100vh - 86px);
  }
  .library-user-panel,
  .library-user-actions,
  .library-modal-head,
  .library-learning-row {
    align-items: stretch;
    flex-direction: column;
    width: 100%;
  }
  .library-user-summary {
    text-align: left;
  }
  .library-user-summary span {
    max-width: none;
  }
  .library-user-actions .btn,
  .library-user-actions button {
    width: 100%;
  }
  .library-profile-grid,
  .library-learning-stats,
  .library-password-grid {
    grid-template-columns: 1fr;
  }
  .library-learning-progress {
    text-align: left;
  }
}


/* V3.3: 전체창 리더 헤더 중복 표시 방지 */
.reader-full-body > .reader-full-topbar ~ .reader-full-topbar {
  display: none !important;
}
.reader-full-body > .reader-full-frame {
  height: calc(100vh - 64px);
}
@media (max-width: 720px) {
  .reader-full-body > .reader-full-frame {
    height: calc(100vh - 86px);
  }
}

/* V3.4: 별도 리더 창 UX 개선 */
.reader-full-actions button.light {
  background: #edf2ff;
  color: #173b80;
}

/* Public preview bookshelf */
.preview-wrap {
  max-width: 1180px;
}
.preview-hero-panel {
  grid-template-columns: minmax(0, 1fr) 260px;
  margin-bottom: 12px;
  padding-bottom: 22px;
}
.preview-hero-panel .library-hero-image img {
  min-height: 150px;
}
.preview-hero-panel h1 {
  max-width: 660px;
}
.preview-panel-primary {
  margin-bottom: 14px;
}
.preview-hero-actions,
.preview-panel-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.btn.primary {
  background: var(--accent);
  color: #fff;
}
.preview-section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
}
.preview-section-head h2 {
  margin: 0 0 4px;
  font-size: 20px;
}
.preview-section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.preview-section-head input {
  width: min(360px, 100%);
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  background: #fff;
}
.preview-book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
}
.preview-book-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 10px;
  min-height: 78px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  text-align: left;
  box-shadow: none;
}
.preview-book-card:hover,
.preview-book-card:focus-visible,
.preview-book-card.active {
  border-color: var(--accent);
  background: #f8fbff;
  outline: none;
}
.preview-book-main {
  display: grid;
  min-width: 0;
  gap: 4px;
}
.preview-book-main strong,
.preview-book-main span {
  overflow: visible;
  white-space: normal;
}
.preview-book-main strong {
  font-size: 15px;
  line-height: 1.35;
  overflow-wrap: anywhere;
  word-break: keep-all;
}
.preview-book-main span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.preview-book-chip {
  max-width: 100%;
  width: max-content;
  margin-top: 8px;
  padding: 5px 8px;
  border-radius: 999px;
  background: #f2f4f7;
  color: #344054;
  font-size: 12px;
  font-weight: 900;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.preview-panel {
  position: relative;
}
.preview-panel::before {
  content: "FREE PREVIEW";
  position: absolute;
  top: 18px;
  right: 20px;
  color: rgba(21, 94, 239, .12);
  font-size: 28px;
  font-weight: 950;
  letter-spacing: 0;
  pointer-events: none;
}
.preview-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  min-width: 0;
  margin-bottom: 12px;
  padding-right: 150px;
}
.preview-panel-head > div {
  min-width: 0;
}
.preview-panel-head h2 {
  margin: 2px 0 4px;
  font-size: 24px;
  line-height: 1.3;
  overflow-wrap: anywhere;
  word-break: keep-all;
}
.preview-panel-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
  overflow-wrap: anywhere;
  word-break: keep-all;
}
.preview-notice {
  margin: 12px 0;
  padding: 10px 12px;
  border: 1px solid #b2ddff;
  border-radius: 12px;
  background: #eff8ff;
  color: #184e77;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.55;
}
.preview-sample-shell {
  overflow: hidden;
  border: 1px solid #d9dfd6;
  border-radius: 14px;
  background: #f7f5ee;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .75);
}
.preview-sample-frame {
  display: block;
  width: 100%;
  height: min(78vh, 860px);
  min-height: 620px;
  border: 0;
  background: #fffdf7;
}
.preview-reading-surface {
  display: grid;
  gap: 12px;
  max-width: 100%;
  max-height: 440px;
  min-height: 320px;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 24px;
  border: 1px solid #e4e7ec;
  border-radius: 16px;
  background: linear-gradient(180deg, #fff 0%, #fbfcff 100%);
  color: #1d2939;
  line-height: 1.78;
  scrollbar-gutter: stable;
  user-select: none;
}
.preview-reading-surface h2 {
  margin: 0 0 2px;
  color: #142234;
  font-size: 21px;
  line-height: 1.45;
}
.preview-reading-surface p {
  margin: 0;
  font-size: 15px;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
.preview-empty-state {
  display: grid;
  gap: 6px;
  min-height: 180px;
  place-content: center;
  text-align: center;
  color: var(--muted);
}
.preview-empty-state strong {
  color: var(--ink);
  font-size: 17px;
}
.preview-reader-shell {
  overflow: hidden;
  border: 1px solid #dbe5e1;
  border-radius: 14px;
  background: #fffdf7;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .72);
}
.preview-reader-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border-bottom: 1px solid #e3ded2;
  background: #fffdf7;
}
.preview-reader-toolbar strong,
.preview-reader-toolbar span {
  display: block;
}
.preview-reader-toolbar strong {
  color: #063b3a;
  font-size: 18px;
  line-height: 1.35;
}
.preview-reader-toolbar span {
  color: #53646b;
  font-size: 13px;
  font-weight: 800;
}
.preview-reader-metrics {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}
.preview-reader-metrics span {
  min-width: 86px;
  padding: 8px 10px;
  border: 1px solid #d8e5df;
  border-radius: 10px;
  background: #fff;
  color: #54666c;
  text-align: left;
}
.preview-reader-metrics b {
  display: block;
  color: #063b3a;
  font-size: 17px;
  line-height: 1.1;
}
.preview-reader-page {
  display: grid;
  gap: 18px;
  max-height: min(76vh, 860px);
  min-height: 520px;
  overflow-y: auto;
  padding: 22px 24px 28px;
  background: #fffdf7;
  scrollbar-gutter: stable;
  overscroll-behavior: contain;
}
.preview-reader-meta,
.preview-question-tags,
.preview-keyword-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.preview-reader-meta span,
.preview-question-tags span,
.preview-keyword-row span {
  padding: 5px 9px;
  border: 1px solid #d8e5df;
  border-radius: 999px;
  background: #fff;
  color: #2e5960;
  font-size: 12px;
  font-weight: 900;
}
.preview-reader-page h3 {
  margin: 0;
  color: #063b3a;
  font-size: 27px;
  line-height: 1.32;
}
.preview-reader-summary {
  margin: 0;
  padding: 14px 16px;
  border-left: 5px solid #14544c;
  background: #eef6f2;
  color: #132b32;
  font-size: 17px;
  font-weight: 750;
  line-height: 1.7;
}
.preview-learning-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, .36fr);
  gap: 14px;
  align-items: stretch;
  padding: 18px;
  border: 1px solid #cfe2dc;
  border-radius: 12px;
  background: #fff;
}
.preview-learning-map strong {
  display: block;
  margin-bottom: 8px;
  color: #063b3a;
  font-size: 22px;
  line-height: 1.35;
}
.preview-learning-map p {
  margin: 0;
  color: #354a50;
  line-height: 1.7;
}
.preview-learning-counts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.preview-learning-counts span {
  display: grid;
  align-content: center;
  gap: 4px;
  min-height: 78px;
  padding: 10px;
  border: 1px solid #dce7e3;
  border-radius: 10px;
  background: #f9fcfa;
  color: #4d6268;
  font-size: 12px;
  font-weight: 900;
}
.preview-learning-counts b {
  color: #0c5750;
  font-size: 25px;
}
.preview-mission-block {
  overflow: hidden;
  border: 1px solid #d9e4df;
  border-radius: 12px;
  background: #fff;
}
.preview-mission-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: #14544c;
  color: #fff;
}
.preview-mission-head > span {
  display: inline-grid;
  flex: 0 0 auto;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 999px;
  background: #ffd25b;
  color: #073933;
  font-weight: 950;
}
.preview-mission-head strong,
.preview-mission-head p {
  display: block;
  margin: 0;
}
.preview-mission-head strong {
  font-size: 21px;
  line-height: 1.35;
}
.preview-mission-head p {
  margin-top: 3px;
  color: rgba(255, 255, 255, .86);
  font-weight: 750;
}
.preview-lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  padding: 16px;
}
.preview-lesson-card {
  min-height: 150px;
  padding: 14px;
  border: 1px solid #e2e8e4;
  border-left: 5px solid #14544c;
  border-radius: 10px;
  background: #fff;
}
.preview-lesson-card.tone-warm {
  border-left-color: #9a6a12;
}
.preview-lesson-card.tone-red {
  border-left-color: #b84235;
}
.preview-lesson-card.tone-blue {
  border-left-color: #2267a8;
}
.preview-lesson-card span {
  display: block;
  margin-bottom: 10px;
  color: #6b4a0d;
  font-size: 12px;
  font-weight: 950;
}
.preview-lesson-card p {
  margin: 0;
  color: #09232c;
  font-size: 16px;
  font-weight: 760;
  line-height: 1.65;
}
.preview-study-block,
.preview-practice-block {
  display: grid;
  gap: 12px;
  border: 1px solid #d9e4df;
  border-radius: 12px;
  padding: 18px;
  background: #fff;
}
.preview-study-block h4 {
  margin: 0;
  color: #063b3a;
  font-size: 22px;
}
.preview-study-two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.preview-study-two article {
  min-height: 130px;
  padding: 14px;
  border: 1px solid #cddff5;
  border-radius: 10px;
  background: #f1f7ff;
}
.preview-study-two span {
  display: block;
  margin-bottom: 8px;
  color: #174e83;
  font-size: 12px;
  font-weight: 950;
}
.preview-study-two p {
  margin: 0;
  color: #0c2733;
  font-size: 16px;
  line-height: 1.7;
}
.preview-practice-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: -18px -18px 2px;
  padding: 16px 18px;
  border-radius: 12px 12px 0 0;
  background: #7c5409;
  color: #fff;
}
.preview-practice-title strong {
  font-size: 22px;
}
.preview-practice-title span {
  font-size: 13px;
  font-weight: 850;
}
.preview-question-card {
  display: grid;
  gap: 10px;
  padding: 16px;
  border: 1px solid #cfe2dc;
  border-left: 5px solid #14544c;
  border-radius: 10px;
  background: #f8fcfa;
}
.preview-question-card p {
  margin: 0;
  color: #062c32;
  font-size: 19px;
  font-weight: 850;
  line-height: 1.55;
}
.preview-question-card p span {
  display: inline-block;
  margin-right: 8px;
  padding: 4px 8px;
  border-radius: 999px;
  background: #14544c;
  color: #fff;
  font-size: 12px;
}
.preview-answer-box {
  display: grid;
  gap: 8px;
}
.preview-answer-box span {
  color: #063b3a;
  font-weight: 950;
}
.preview-answer-box textarea {
  width: 100%;
  min-height: 130px;
  resize: vertical;
  border: 1px solid #cddfda;
  border-radius: 10px;
  padding: 12px;
  color: #132b32;
  font: inherit;
  line-height: 1.6;
}
.preview-practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.preview-feedback {
  min-height: 22px;
  color: #155e4f;
  font-size: 14px;
  font-weight: 850;
}
.preview-model-answer {
  overflow: hidden;
  border: 1px solid #ead59b;
  border-radius: 10px;
  background: #fff8df;
}
.preview-model-answer summary {
  cursor: pointer;
  padding: 13px 16px;
  color: #6d4a06;
  font-weight: 950;
}
.preview-model-answer div {
  display: grid;
  gap: 10px;
  padding: 0 16px 16px;
}
.preview-model-answer p,
.preview-model-answer ul {
  margin: 0;
  color: #3f2d08;
  line-height: 1.8;
}
@media (max-width: 720px) {
  .preview-section-head,
  .preview-panel-head {
    flex-direction: column;
    padding-right: 0;
  }
  .preview-panel-head h2 {
    max-width: 100%;
    font-size: 22px;
    white-space: normal;
    word-break: break-all;
  }
  .preview-panel-head .btn {
    width: 100%;
  }
  .preview-hero-panel {
    grid-template-columns: minmax(0, 1fr);
  }
  .preview-panel::before {
    position: static;
    display: block;
    margin-bottom: 6px;
    font-size: 18px;
  }
  .preview-book-grid,
  .preview-book-card {
    grid-template-columns: minmax(0, 1fr);
  }
  .preview-book-chip {
    max-width: 100%;
    width: max-content;
  }
  .preview-reading-surface {
    max-height: 54vh;
    padding: 18px;
  }
  .preview-sample-frame {
    height: 74vh;
    min-height: 560px;
  }
  .preview-reader-toolbar,
  .preview-practice-title {
    align-items: stretch;
    flex-direction: column;
  }
  .preview-reader-metrics,
  .preview-learning-counts,
  .preview-lesson-grid,
  .preview-study-two,
  .preview-learning-map {
    grid-template-columns: 1fr;
  }
  .preview-reader-metrics {
    justify-content: flex-start;
  }
  .preview-reader-metrics span {
    min-width: 0;
    width: 100%;
  }
  .preview-reader-page {
    max-height: 64vh;
    min-height: 480px;
    padding: 18px 14px 22px;
  }
  .preview-reader-page h3 {
    font-size: 23px;
  }
  .preview-reader-summary,
  .preview-question-card p,
  .preview-study-two p,
  .preview-lesson-card p {
    font-size: 15px;
  }
  .preview-mission-head {
    align-items: flex-start;
  }
  .preview-hero-actions .btn,
  .preview-panel-actions .btn,
  .preview-panel-actions button,
  .preview-practice-actions button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .app-topbar,
  .login-layout,
  .login-hero-panel,
  .library-hero-panel,
  .card {
    margin-left: 0;
    margin-right: 0;
    max-width: min(358px, calc(100vw - 32px));
  }
}