:root {
  color-scheme: light;
  --ink: #27262b;
  --muted: #706c75;
  --canvas: #f5f4f6;
  --surface: #ffffff;
  --line: #ddd9df;
  --line-strong: #c9c3cb;
  --spike: #bd2382;
  --spike-dark: #7f1556;
  --spike-soft: #fae5f3;
  --essential: #04a047;
  --prime: #6b42c1;
  --green: #20765d;
  --green-soft: #e1f0ea;
  --yellow: #ffd84d;
  --shadow: 0 18px 48px rgb(39 38 43 / 14%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family:
    "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--spike-dark);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.library-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: grid;
  grid-template-columns: minmax(220px, auto) minmax(320px, 1fr) auto;
  align-items: stretch;
  border-bottom: 1px solid var(--line-strong);
  background: rgb(255 255 255 / 96%);
  box-shadow: 0 2px 12px rgb(39 38 43 / 7%);
  backdrop-filter: blur(14px);
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.7rem 1.2rem;
  color: inherit;
  text-decoration: none;
}

.brand-block:hover .product-name {
  color: var(--spike-dark);
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 9px;
  background: var(--spike);
  color: white;
  font-size: 1.4rem;
  font-weight: 900;
}

.product-name {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.15;
}

.product-nav {
  display: flex;
  min-width: 0;
  align-items: stretch;
}

.product-nav-button {
  position: relative;
  display: grid;
  grid-template-columns: auto auto;
  min-width: 155px;
  align-content: center;
  gap: 0.1rem 0.65rem;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  padding: 0.65rem 1.1rem;
  color: var(--muted);
  text-align: left;
}

.product-nav-button:last-child {
  border-right: 1px solid var(--line);
}

.product-nav-button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 4px;
  background: transparent;
  content: "";
}

.product-nav-button:hover {
  background: var(--canvas);
  color: var(--ink);
}

.product-nav-button.is-active {
  background: var(--surface);
  color: var(--spike-dark);
}

.product-nav-button.is-active::after {
  background: var(--spike);
}

.nav-symbol {
  grid-row: 1 / 3;
  align-self: center;
  color: currentColor;
  font-size: 1.45rem;
  line-height: 1;
}

.product-nav-button > span:not(.nav-symbol) {
  align-self: end;
  font-size: 0.86rem;
  font-weight: 800;
}

.product-nav-button small {
  align-self: start;
  color: var(--muted);
  font-size: 0.68rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1rem;
}

.header-actions button {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  padding: 0.6rem 0.8rem;
  color: var(--ink);
  font-size: 0.75rem;
  white-space: nowrap;
}

.header-actions button:hover {
  border-color: var(--spike);
  color: var(--spike-dark);
}

main {
  width: min(1840px, 100%);
  margin: 0 auto;
  padding: 2.2rem clamp(1.2rem, 2.4vw, 3.2rem) 6rem;
}

.page-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 620px);
  align-items: end;
  gap: 1rem 3rem;
  margin-bottom: 1.7rem;
}

.page-heading h1 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 3.5vw, 3.6rem);
  font-weight: 500;
  letter-spacing: -0.04em;
}

.page-heading > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.75;
}

.toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.4rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 0.8rem 0;
}

.toolbar label {
  display: grid;
  width: min(520px, 100%);
  gap: 0.25rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
}

.toolbar input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  padding: 0.6rem 0.8rem;
  color: var(--ink);
}

.toolbar input:focus {
  border-color: var(--spike);
  outline: 3px solid var(--spike-soft);
}

.result-count {
  margin: 0 0 0.3rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.notice {
  margin-bottom: 1rem;
  border: 1px solid #e1aa27;
  border-radius: 8px;
  background: #fff7db;
  padding: 0.85rem 1rem;
  line-height: 1.6;
}

.unit-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 1.8vw, 1.8rem);
}

.unit-card {
  overflow: hidden;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface);
  padding: 0;
  color: var(--ink);
  text-align: left;
  box-shadow: 0 4px 16px rgb(39 38 43 / 6%);
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.unit-card:hover {
  transform: translateY(-4px);
  border-color: var(--spike);
  box-shadow: var(--shadow);
}

.unit-card:focus-visible {
  outline: 4px solid rgb(189 35 130 / 25%);
  outline-offset: 2px;
}

.unit-thumbnail-wrap {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(135deg, rgb(189 35 130 / 84%), rgb(107 66 193 / 72%)),
    var(--spike);
}

.unit-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 220ms ease;
}

.unit-card:hover .unit-thumbnail {
  transform: scale(1.025);
}

.unit-index {
  position: absolute;
  top: 0.7rem;
  left: 0.7rem;
  display: grid;
  min-width: 2rem;
  height: 2rem;
  place-items: center;
  border-radius: 999px;
  background: rgb(255 255 255 / 90%);
  color: var(--spike-dark);
  font-size: 0.72rem;
  font-weight: 900;
  box-shadow: 0 3px 10px rgb(39 38 43 / 16%);
}

.unit-card-body {
  display: grid;
  min-height: 154px;
  align-content: start;
  padding: 1rem 1rem 1.1rem;
}

.unit-title {
  margin-bottom: 0.35rem;
  font-size: 1rem;
  line-height: 1.45;
}

.unit-subtitle {
  display: -webkit-box;
  overflow: hidden;
  min-height: 2.5em;
  margin-bottom: 0.8rem;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.unit-meta {
  align-self: end;
  color: var(--spike-dark);
  font-size: 0.7rem;
  font-weight: 800;
}

dialog {
  width: min(1480px, calc(100vw - 2rem));
  height: min(900px, calc(100vh - 2rem));
  max-width: none;
  max-height: none;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: var(--surface);
  padding: 0;
  color: var(--ink);
  box-shadow: 0 28px 90px rgb(0 0 0 / 30%);
}

dialog::backdrop {
  background: rgb(28 24 30 / 64%);
  backdrop-filter: blur(4px);
}

.dialog-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  min-height: 82px;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.8rem 1rem 0.8rem 1.3rem;
}

.dialog-heading {
  min-width: 0;
}

.dialog-heading h2 {
  overflow: hidden;
  margin: 0;
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.back-button {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  padding: 0.55rem 0.8rem;
  color: var(--spike-dark);
  font-size: 0.76rem;
  font-weight: 800;
}

.close-button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 0;
  border-radius: 999px;
  background: var(--canvas);
  color: var(--ink);
  font-size: 1.7rem;
}

.dialog-layout {
  display: grid;
  height: calc(100% - 82px);
  grid-template-columns: minmax(0, 1fr) minmax(330px, 410px);
}

.dialog-content {
  overflow: auto;
  padding: clamp(1.2rem, 2.3vw, 2.4rem);
}

.unit-hero {
  display: grid;
  grid-template-columns: minmax(230px, 42%) 1fr;
  align-items: center;
  gap: clamp(1.2rem, 3vw, 2.5rem);
  margin-bottom: 2.4rem;
}

.unit-hero img {
  width: 100%;
  max-height: 310px;
  border-radius: 12px;
  object-fit: cover;
}

.unit-hero h3 {
  margin-bottom: 0.55rem;
  font-size: clamp(1.5rem, 2.4vw, 2.4rem);
  line-height: 1.35;
}

.unit-hero p {
  color: var(--muted);
  line-height: 1.8;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.85rem;
}

.chip {
  border-radius: 999px;
  background: var(--spike-soft);
  padding: 0.35rem 0.65rem;
  color: var(--spike-dark);
  font-size: 0.69rem;
  font-weight: 800;
}

.section-title {
  margin-bottom: 0.8rem;
  font-size: 1.15rem;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.lesson-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 0;
  color: var(--ink);
  text-align: left;
}

.lesson-card:hover {
  border-color: var(--spike);
  box-shadow: 0 10px 28px rgb(39 38 43 / 11%);
}

.lesson-card img,
.lesson-image-placeholder {
  display: grid;
  width: 100%;
  aspect-ratio: 16 / 10;
  place-items: center;
  background: linear-gradient(135deg, var(--spike-soft), #ece5f7);
  object-fit: cover;
}

.lesson-image-placeholder {
  color: var(--spike-dark);
  font-size: 1.5rem;
  font-weight: 900;
}

.lesson-card-copy {
  display: grid;
  gap: 0.25rem;
  min-height: 112px;
  padding: 0.8rem;
}

.lesson-number {
  color: var(--spike-dark);
  font-size: 0.65rem;
  font-weight: 900;
}

.lesson-card strong {
  line-height: 1.45;
}

.lesson-card small {
  color: var(--muted);
  line-height: 1.45;
}

.lesson-overview {
  display: grid;
  grid-template-columns: minmax(180px, 340px) 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem;
}

.lesson-overview img {
  width: 100%;
  border-radius: 10px;
}

.lesson-overview p {
  color: var(--muted);
  line-height: 1.75;
}

.steps {
  display: grid;
  gap: 1.1rem;
}

.step {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
}

.step:first-child {
  border-top: 0;
}

.step-number {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 50%;
  background: var(--spike-soft);
  color: var(--spike-dark);
  font-size: 0.75rem;
  font-weight: 900;
}

.step h4 {
  margin-bottom: 0.6rem;
  font-size: 1rem;
}

.step p {
  margin-bottom: 0.65rem;
  line-height: 1.75;
  white-space: pre-line;
}

.step-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
}

.step-badge {
  border-radius: 999px;
  background: var(--green-soft);
  padding: 0.3rem 0.55rem;
  color: var(--green);
  font-size: 0.65rem;
  font-weight: 800;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 0.8rem;
}

.media-grid img,
.media-grid video {
  width: 100%;
  max-height: 390px;
  border-radius: 8px;
  background: #eceaec;
  object-fit: contain;
}

.media-grid audio {
  width: 100%;
}

.media-link {
  display: grid;
  min-height: 90px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--spike-dark);
  font-weight: 800;
}

.research-panel {
  overflow: auto;
  border-left: 1px solid var(--line);
  background: #fbfafb;
  padding: 1.25rem;
}

.research-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.research-heading h3 {
  margin: 0;
}

#save-status {
  border-radius: 999px;
  background: var(--green-soft);
  padding: 0.35rem 0.6rem;
  color: var(--green);
  font-size: 0.65rem;
  font-weight: 800;
}

.research-guidance {
  margin: 0.8rem 0 1.1rem;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.7;
}

.research-field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.research-field label {
  font-size: 0.76rem;
  font-weight: 800;
}

.research-field small {
  color: var(--muted);
  font-size: 0.66rem;
  line-height: 1.5;
}

.research-field textarea {
  width: 100%;
  min-height: 82px;
  resize: vertical;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--surface);
  padding: 0.65rem;
  color: var(--ink);
  font-size: 0.78rem;
  line-height: 1.6;
}

.research-field textarea:focus {
  border-color: var(--spike);
  outline: 3px solid var(--spike-soft);
}

@media (max-width: 1260px) {
  .library-header {
    grid-template-columns: auto 1fr;
  }

  .header-actions {
    display: none;
  }

  .unit-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .lesson-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .library-header {
    position: static;
    grid-template-columns: 1fr;
  }

  .brand-block {
    border-bottom: 1px solid var(--line);
  }

  .product-nav-button {
    width: 50%;
    min-width: 0;
  }

  .page-heading,
  .unit-hero,
  .lesson-overview {
    grid-template-columns: 1fr;
  }

  .unit-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  dialog {
    width: 100vw;
    height: 100vh;
    border: 0;
    border-radius: 0;
  }

  .dialog-layout {
    overflow: auto;
    grid-template-columns: 1fr;
  }

  .dialog-content,
  .research-panel {
    overflow: visible;
  }

  .research-panel {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
}

@media (max-width: 580px) {
  main {
    padding-right: 0.9rem;
    padding-left: 0.9rem;
  }

  .unit-grid,
  .lesson-grid,
  .media-grid {
    grid-template-columns: 1fr;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .dialog-header {
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 0.5rem;
    padding-left: 0.7rem;
  }

  .back-button {
    overflow: hidden;
    width: 42px;
    padding: 0.55rem;
    white-space: nowrap;
  }

  .step {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 0.6rem;
  }

  .step-number {
    width: 38px;
    height: 38px;
  }
}