/* ==========================================================================
   Mouseion 慕识书院 · 馆藏书目（/bookstore/）样式
   复用 site.css 的设计令牌与基础组件，仅补充书目列表、详情与预约表单
   ========================================================================== */

/* ---------- 工具栏 ---------- */
.bk-main {
  background: var(--paper);
}

.bk-toolbar {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
}

.bk-toolbar__row {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.bk-search {
  display: flex;
  gap: 10px;
}

.bk-search input {
  flex: 1;
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 0.98rem;
}

.bk-search input:focus-visible {
  outline: 2px solid var(--slate);
  outline-offset: 1px;
  border-color: var(--slate-3);
}

.bk-search button {
  flex: none;
}

.bk-selects {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr));
}

.bk-select {
  display: grid;
  gap: 6px;
}

.bk-select span {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-family: var(--font-disp);
}

.bk-select select {
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
}

.bk-count {
  font-size: 0.88rem;
  color: var(--ink-3);
}

.bk-count b {
  color: var(--ink);
  font-family: var(--font-disp);
  font-size: 1.05rem;
}

/* ---------- 书目网格 ---------- */
.bk-grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr));
  margin-top: clamp(22px, 3vw, 34px);
}

.bk-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.bk-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.bk-card__body {
  display: grid;
  gap: 6px;
}

.bk-card__title {
  font-size: 1rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.9em;
}

.bk-card__meta {
  font-size: 0.82rem;
  color: var(--ink-3);
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bk-card__foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-top: 2px;
}

.bk-price {
  font-family: var(--font-disp);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--slate);
}

.bk-price small {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--ink-3);
  margin-left: 6px;
}

/* ---------- 封面（无实拍图时，用书名排版成“书脊”封面） ---------- */
.bk-cover {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: var(--r-sm);
  overflow: hidden;
  background: linear-gradient(158deg, var(--c1, #244c5c), var(--c2, #1b3a47));
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 16px 15px 16px 22px;
  box-shadow: var(--shadow-1);
}

.bk-cover::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 7px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0));
  border-right: 1px solid rgba(255, 255, 255, 0.22);
}

.bk-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 70% at 120% 0%, rgba(255, 255, 255, 0.18), transparent 60%);
  pointer-events: none;
}

.bk-cover__cat {
  position: relative;
  font-family: var(--font-disp);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.82);
}

.bk-cover__title {
  position: relative;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.24);
}

.bk-cover__foot {
  position: relative;
  font-size: 0.74rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.86);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bk-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 分页 ---------- */
.bk-pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 40px);
  flex-wrap: wrap;
}

.bk-pager__info {
  font-size: 0.9rem;
  color: var(--ink-2);
}

.bk-pager__info b {
  font-family: var(--font-disp);
  color: var(--ink);
}

/* ---------- 状态提示 ---------- */
.bk-state {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(40px, 6vw, 70px) 24px;
  text-align: center;
  color: var(--ink-3);
  background: var(--surface);
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
}

.bk-state__spinner {
  width: 30px;
  height: 30px;
  margin: 0 auto 14px;
  border: 3px solid var(--line);
  border-top-color: var(--slate-3);
  border-radius: 50%;
  animation: bk-spin 0.9s linear infinite;
}

@keyframes bk-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- 详情页 ---------- */
.bk-detail {
  display: grid;
  gap: clamp(24px, 3.4vw, 52px);
  align-items: start;
}

.bk-detail__cover {
  max-width: 320px;
}

.bk-detail__cover .bk-cover {
  font-size: 1.1rem;
}

.bk-detail__cover .bk-cover__title {
  font-size: 1.35rem;
  -webkit-line-clamp: 7;
}

.bk-detail__title {
  font-size: clamp(1.5rem, 1.05rem + 1.9vw, 2.3rem);
  line-height: 1.28;
  margin-top: 10px;
}

.bk-detail__sub {
  margin-top: 12px;
  font-size: 1rem;
  color: var(--ink-2);
}

.bk-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.bk-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: var(--paper-2);
  color: var(--ink-2);
  font-size: 0.78rem;
  font-weight: 600;
}

.bk-tag--gold {
  background: #fdf3d0;
  color: var(--bronze-ink);
}

.bk-tag--slate {
  background: #e7eef0;
  color: var(--slate);
}

.bk-buybar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 24px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-1);
}

.bk-buybar__price {
  font-family: var(--font-disp);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--slate);
}

.bk-buybar__price small {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--ink-3);
}

.bk-buybar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-left: auto;
}

.bk-price-old {
  color: var(--ink-3);
  font-size: 1.02rem;
  font-weight: 500;
  text-decoration: line-through;
}

.bk-buybar .btn[hidden] {
  display: none;
}

.bk-field[hidden] {
  display: none;
}

/* 规格表 */
.bk-spec {
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--surface);
}

.bk-spec__row {
  display: grid;
  grid-template-columns: 7.5em minmax(0, 1fr);
  gap: 14px;
  padding: 12px 18px;
  font-size: 0.92rem;
  border-top: 1px solid var(--line-2);
}

.bk-spec__row:first-child {
  border-top: 0;
}

.bk-spec__k {
  color: var(--ink-3);
  font-size: 0.85rem;
}

.bk-summary {
  margin-top: clamp(22px, 3vw, 32px);
}

.bk-summary h2 {
  font-size: 1.15rem;
}

.bk-summary p {
  margin-top: 12px;
  font-size: 0.98rem;
  line-height: 1.95;
  color: var(--ink-2);
  white-space: pre-line;
}

/* ---------- 预约弹层 ---------- */
.bk-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: rgba(20, 16, 13, 0.6);
  backdrop-filter: blur(3px);
}

.bk-modal.is-open {
  display: flex;
}

.bk-modal__panel {
  width: 100%;
  max-width: 33rem;
  max-height: 92vh;
  overflow-y: auto;
  background: var(--surface);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-2);
  padding: clamp(22px, 3vw, 32px);
}

.bk-modal__head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 18px;
}

.bk-modal__head h2 {
  font-size: 1.25rem;
}

.bk-modal__head p {
  margin-top: 6px;
  font-size: 0.86rem;
  color: var(--ink-3);
}

.bk-modal__close {
  margin-left: auto;
  flex: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink-2);
  font-size: 1.1rem;
  line-height: 1;
}

.bk-modal__close:hover {
  background: var(--paper-2);
}

.bk-form {
  display: grid;
  gap: 15px;
}

.bk-field {
  display: grid;
  gap: 7px;
}

.bk-field > span {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-2);
}

.bk-field > span i {
  font-style: normal;
  color: #c0392b;
  margin-left: 2px;
}

.bk-input {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}

textarea.bk-input {
  min-height: 84px;
  resize: vertical;
}

.bk-input:focus-visible {
  outline: 2px solid var(--slate);
  outline-offset: 1px;
  border-color: var(--slate-3);
}

.bk-choice {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr 1fr;
}

.bk-choice label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--paper);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: border-color 0.16s, background-color 0.16s;
}

.bk-choice input {
  accent-color: var(--slate);
  width: 18px;
  height: 18px;
}

.bk-choice label:has(input:checked) {
  border-color: var(--slate-3);
  background: #eef4f6;
}

.bk-honeypot {
  position: absolute !important;
  left: -9999px !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.bk-msg {
  display: none;
  font-size: 0.9rem;
  line-height: 1.7;
}

.bk-msg.is-on {
  display: block;
}

.bk-msg--ok {
  color: #1f6f4a;
}

.bk-msg--err {
  color: #b23c2f;
}

.bk-msg--info {
  color: var(--ink-3);
}

.bk-form__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.bk-form__foot .btn {
  min-width: 8.5rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .bk-toolbar__row {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .bk-detail {
    grid-template-columns: 320px minmax(0, 1fr);
  }
}

@media (max-width: 520px) {
  .bk-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .bk-card {
    padding: 10px;
  }

  .bk-cover {
    padding: 12px 11px 12px 17px;
  }

  .bk-cover__title {
    font-size: 0.92rem;
    -webkit-line-clamp: 4;
  }

  .bk-card__foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .bk-buybar__actions {
    width: 100%;
    margin-left: 0;
  }

  .bk-buybar .btn {
    margin-left: 0;
    width: 100%;
  }
}