@charset "utf-8";

/* ============================================================
   南京大学出版社 · 新时代英语教材书号检索
   Editorial / Publishing-house aesthetic
   ============================================================ */

@font-face {
  font-family: "Butler";
  src: url("src/Butler_Regular.otf") format("opentype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "FZSKXKKai";
  src: url("src/方正宋刻本秀楷简体.TTF") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  /* 颜色系统：温暖纸张 × 墨色 × 学术酒红 × 沉稳靛蓝 */
  --paper:        #f6f1e6;
  --paper-soft:   #faf7ee;
  --paper-deep:   #ede4cf;
  --ink:          #1a1612;
  --ink-soft:     #4a3f33;
  --ink-muted:    #8a7d6a;
  --rule:         #d4c9b3;
  --rule-bold:    #7a6850;
  --brand:        #7a1f24;
  --brand-soft:   #a14146;
  --brand-tint:   #f3e3e0;
  --accent:       #1e3a5f;
  --gold:         #b08a3e;

  --font-display: "Butler", "FZSKXKKai", serif;
  --font-body:    "Butler", "FZSKXKKai", serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --page-max: 1180px;
}

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

html {
  font-size: 17px;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  line-height: 1.55;
  min-height: 100vh;
  /* 温暖光晕 + 极淡纸张噪点 */
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse 70% 50% at 50% -8%, rgba(122, 31, 36, 0.055), transparent 65%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(30, 58, 95, 0.04), transparent 65%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.07 0 0 0 0 0.05 0 0 0 0.035 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* ----- 入场 ----- */
.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 3rem) 3rem;
  animation: page-in 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

@keyframes page-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===========================
   Masthead — 出版物头部
   =========================== */
.masthead { margin-bottom: 2rem; }

.masthead__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.6rem;
}

.masthead__brand { font-weight: 500; color: var(--ink-soft); }

.masthead__meta {
  display: inline-flex;
  gap: 0.5rem;
  align-items: baseline;
}

.meta__label {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.8rem;
  text-transform: lowercase;
  letter-spacing: 0;
  color: var(--ink-muted);
}

#generated-at { font-variant-numeric: tabular-nums; }

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}

.rule--bold {
  border-top: 2px solid var(--rule-bold);
  position: relative;
}

/* 粗 rule 上的小装饰 —— 像书脊钉/扉页徽记 */
.rule--bold::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -4px;
  width: 7px;
  height: 7px;
  background: var(--brand);
  transform: translateX(-50%) rotate(45deg);
}

.masthead__title {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "overline en"
    "main     en";
  align-items: end;
  column-gap: 2rem;
  row-gap: 0.4rem;
  margin: 2.25rem 0 1.5rem;
  font-weight: normal;
}

.title__overline {
  grid-area: overline;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--brand);
  letter-spacing: 0.02em;
}

.title__main {
  grid-area: main;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1;
  color: var(--ink);
}

.title__en {
  grid-area: en;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--ink-soft);
  align-self: end;
  padding-bottom: 0.45rem;
  white-space: nowrap;
}

.masthead__intro {
  max-width: 58ch;
  margin: 1.5rem 0;
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.75;
  font-family: var(--font-body);
}

/* ===========================
   Filters — 三栏目录索引
   =========================== */
.filters {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.75rem;
  margin: 2.5rem 0 1.5rem;
}

.filter-group { border: 0; padding: 0; }

.filter-group__legend {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin-bottom: 1rem;
  width: 100%;
  padding-bottom: 0.5rem;
  border-bottom: 1px dotted var(--rule);
}

.legend__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--brand);
  letter-spacing: 0.05em;
  padding-right: 0.55rem;
  border-right: 1px solid var(--rule);
}

.legend__zh {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--ink);
}

.legend__en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-muted);
  letter-spacing: 0.01em;
}

.filter-group__items {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* ----- Chip 目录条目风格 ----- */
.chip {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  cursor: pointer;
  padding: 0.2rem 0;
  color: var(--ink-soft);
  transition: color 0.18s ease;
  position: relative;
  user-select: none;
}

.chip:hover { color: var(--ink); }

.chip:hover .chip__label {
  text-decoration: underline;
  text-decoration-color: var(--brand-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.chip__marker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-muted);
  width: 1ch;
  text-align: center;
  display: inline-block;
  transition: color 0.18s ease, transform 0.18s ease;
}

.chip__label {
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: 0.005em;
  transition: font-weight 0s, letter-spacing 0.18s ease;
}

/* 选中态 */
.chip:has(input:checked) { color: var(--brand); }
.chip:has(input:checked) .chip__marker {
  color: var(--brand);
  transform: scale(1.05);
}
.chip:has(input:checked) .chip__label {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--brand);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 5px;
}

/* 空匹配灰显（仍可点） */
.chip[data-empty] { opacity: 0.32; }
.chip[data-empty] .chip__label { font-style: italic; }
.chip[data-empty]:has(input:checked) { opacity: 1; }

/* 册数列用等宽 */
.filter-group[data-group="volume"] .chip__label {
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
  font-size: 1rem;
}

/* ===========================
   Toolbar — 计数 + 操作
   =========================== */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
  position: relative;
}

.toolbar__count {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  font-family: var(--font-display);
  color: var(--ink);
}

.count__num {
  font-size: 2.4rem;
  font-weight: 500;
  font-feature-settings: "tnum", "lnum";
  color: var(--brand);
  line-height: 1;
  letter-spacing: -0.01em;
}

.count__unit {
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.count__divider {
  margin: 0 0.5rem;
  color: var(--rule);
  font-size: 1.1rem;
}

.count__total {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toolbar__actions {
  display: inline-flex;
  gap: 0.6rem;
}

.btn {
  font-family: var(--font-display);
  font-size: 1rem;
  cursor: pointer;
  border: 1px solid var(--rule-bold);
  background: transparent;
  color: var(--ink);
  padding: 0.55rem 1.15rem;
  border-radius: 0;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  letter-spacing: 0.01em;
}

.btn:active { transform: translateY(1px); }

.btn--ghost:hover {
  background: var(--paper-soft);
  border-color: var(--ink);
}

.btn--primary {
  background: var(--brand);
  color: var(--paper);
  border-color: var(--brand);
}

.btn--primary:hover {
  background: var(--ink);
  border-color: var(--ink);
}

.btn--primary .btn__arrow {
  transition: transform 0.22s ease;
  display: inline-block;
}

.btn--primary:hover .btn__arrow {
  transform: translate(3px, -3px);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.toolbar__status {
  flex-basis: 100%;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--brand);
  text-align: right;
  min-height: 1.3em;
  margin-top: 0.15rem;
  letter-spacing: 0.02em;
}

.toolbar__status:not(:empty)::before {
  content: "⌖ ";
  font-style: normal;
  margin-right: 0.2rem;
}

/* ===========================
   Catalog — 表格
   =========================== */
.results { margin: 1rem 0 2rem; }

.catalog-wrap {
  overflow-x: auto;
  /* 滚动阴影提示 */
  background:
    linear-gradient(to right, var(--paper) 30%, rgba(246, 241, 230, 0)),
    linear-gradient(to right, rgba(246, 241, 230, 0), var(--paper) 70%) 100% 0,
    radial-gradient(farthest-side at 0% 50%, rgba(0, 0, 0, 0.08), transparent),
    radial-gradient(farthest-side at 100% 50%, rgba(0, 0, 0, 0.08), transparent) 100% 0;
  background-repeat: no-repeat;
  background-size: 40px 100%, 40px 100%, 14px 100%, 14px 100%;
  background-attachment: local, local, scroll, scroll;
}

.catalog {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
}

.catalog thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-muted);
  padding: 0.85rem 0.9rem 0.6rem;
  border-bottom: 2px solid var(--rule-bold);
  position: sticky;
  top: 0;
  background: var(--paper);
  white-space: nowrap;
  vertical-align: bottom;
  z-index: 2;
}

.catalog thead .th__en {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.74rem;
  color: var(--ink-muted);
  margin-top: 2px;
  opacity: 0.75;
}

.catalog tbody td {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  font-size: 0.95rem;
  color: var(--ink);
}

.catalog tbody tr {
  transition: background 0.18s ease;
  position: relative;
}

.catalog tbody tr:hover { background: var(--paper-soft); }

.catalog tbody tr:hover td:first-child {
  box-shadow: inset 3px 0 0 var(--brand);
}

/* 列样式 */
.catalog td.col-isbn {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--ink-soft);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.catalog td.col-title {
  white-space: nowrap;
  font-weight: 500;
  font-size: 0.98rem;
}

.catalog td.col-price {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: var(--ink-soft);
  white-space: nowrap;
  font-feature-settings: "tnum";
  letter-spacing: 0.01em;
}

.catalog td.col-price:not(:empty)::before {
  content: "¥ ";
  color: var(--ink-muted);
  margin-right: 0.05em;
}

.catalog td.col-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.catalog td.col-authors {
  white-space: nowrap;
  font-size: 0.9rem;
  color: var(--ink-soft);
  font-style: italic;
}

/* 空结果 */
.results__empty {
  padding: 4rem 1rem 3rem;
  text-align: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink-soft);
  background: var(--paper-soft);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.empty__symbol {
  display: block;
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--rule-bold);
  margin-bottom: 0.75rem;
  line-height: 1;
}

.empty__en {
  display: block;
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 0.5rem;
}

.filters-wrapper { position: relative; }

.filters-toggle {
  display: none;
  width: 100%;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper-soft);
  border: 1px solid var(--rule-bold);
  cursor: pointer;
  text-align: left;
}

.filters-toggle__icon {
  font-size: 0.8rem;
  transition: transform 0.2s ease;
  display: inline-block;
}

.filters-wrapper:not(.collapsed) .filters-toggle__icon {
  transform: rotate(90deg);
}

.filters-toggle__label { font-weight: 500; }

.filters-toggle__summary {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
}

/* ===========================
   Colophon — 版权页脚
   =========================== */
.colophon {
  margin-top: 3rem;
  padding-bottom: 1rem;
}

.colophon__line {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  margin-top: 1.25rem;
  line-height: 1.85;
}

.colophon__brand {
  color: var(--brand);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.colophon__sep {
  margin: 0 0.5em;
  color: var(--rule);
}

.colophon code {
  font-family: var(--font-mono);
  font-size: inherit;
  background: var(--paper-soft);
  padding: 0.05rem 0.35rem;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 940px) {
  .filters {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .masthead__title {
    grid-template-columns: 1fr;
    grid-template-areas: "overline" "main" "en";
  }
  .title__en { padding-bottom: 0; padding-top: 0.3rem; }
}

@media (max-width: 600px) {
  html { font-size: 15px; }
  .masthead__top { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
  .toolbar { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .toolbar__count .count__total { display: block; margin-top: 0.25rem; }
  .toolbar__status { text-align: left; }
  .catalog thead .th__en { display: none; }

  /* ---- Header 精简 ---- */
  .masthead__title {
    margin: 1.5rem 0 1rem;
  }
  .title__main {
    font-size: 2rem;
  }
  .title__en {
    font-size: 0.9rem;
  }
  .masthead__intro {
    font-size: 0.85rem;
    margin: 1rem 0;
  }

  /* ---- 筛选区折叠 ---- */
  .filters-toggle { display: flex; }
  .filters-wrapper.collapsed .filters { display: none; }
  .filters-wrapper:not(.collapsed) .filters {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 0.75rem;
  }
  .filters { margin: 0; }

  /* ---- Chip 横向滚动 ---- */
  .filter-group__items {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
    -webkit-overflow-scrolling: touch;
  }
  .chip {
    flex-shrink: 0;
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--rule);
    background: var(--paper-soft);
    gap: 0.5rem;
  }
  .chip__label {
    font-size: 0.92rem;
    white-space: nowrap;
  }
  .chip__marker { font-size: 0.75rem; }

  /* ---- 表格卡片化 ---- */
  .catalog,
  .catalog tbody,
  .catalog tr,
  .catalog td {
    display: block;
    width: 100%;
  }
  .catalog thead { display: none; }
  .catalog-wrap {
    background: none;
    overflow-x: visible;
  }
  .catalog tr {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid var(--rule);
    background: var(--paper-soft);
  }
  .catalog td {
    border: 0;
    padding: 0.3rem 0;
    white-space: normal;
    display: flex;
    justify-content: space-between;
  }
  .catalog td::before,
  .catalog td.col-price:not(:empty)::before {
    content: attr(data-label);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  .catalog td.col-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    border-bottom: 1px dotted var(--rule);
    padding-bottom: 0.5rem;
    display: block;
  }
  .catalog td.col-title::before { display: none; }
  .catalog tbody tr:hover { background: var(--paper-soft); }
  .catalog tbody tr:hover td:first-child { box-shadow: none; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}