:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e3e6ea;
  --color-text: #1f2937;
  --color-text-2: #6b7280;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-danger: #dc2626;
  --color-accent: #f59e0b;
  --header-h: 56px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  overflow: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
}

button:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

button.primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

button.primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

/* ---- Header ---- */
#app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  z-index: 50;
}

.brand {
  font-size: 17px;
  font-weight: 700;
  white-space: nowrap;
}

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 520px;
  display: flex;
  margin: 0 auto;
}

.search-wrap input {
  flex: 1;
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: 6px 0 0 6px;
  font-size: 13px;
  outline: none;
}

.search-wrap input:focus {
  border-color: var(--color-primary);
}

.search-wrap button {
  border-radius: 0 6px 6px 0;
  height: 34px;
}

.dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  max-height: 320px;
  overflow-y: auto;
  z-index: 60;
}

.dropdown-item {
  padding: 8px 10px;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
}

.dropdown-item:hover {
  background: #eff6ff;
}

.dropdown-item .item-title {
  font-weight: 600;
}

.dropdown-item .item-meta {
  color: var(--color-text-2);
  font-size: 12px;
  margin-top: 2px;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

#user-name {
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-text-2);
  font-size: 13px;
}

/* ---- Auth modal ---- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
}

.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.45);
}

.modal-box {
  position: relative;
  z-index: 1;
  width: 320px;
  max-width: 90vw;
  margin: 15vh auto 0;
  background: var(--color-surface);
  border-radius: 10px;
  padding: 20px 22px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
}

.modal-box h3 {
  margin: 0 0 16px;
  font-size: 17px;
}

.modal-box label {
  display: block;
  font-size: 12px;
  color: var(--color-text-2);
  margin: 10px 0 4px;
}

.modal-box input {
  width: 100%;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  box-sizing: border-box;
}

.modal-box input:focus {
  border-color: var(--color-primary);
}

.auth-error {
  color: var(--color-danger);
  font-size: 12px;
  margin: 10px 0 0;
}

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 18px;
}

.modal-actions button {
  flex: 1;
  height: 36px;
}

.auth-switch {
  margin-top: 14px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-2);
}

.auth-switch button {
  border: none;
  background: none;
  color: var(--color-primary);
  padding: 2px 4px;
}

/* ---- Main / views ---- */
#app-main {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
}

.view {
  display: none;
  height: 100%;
}

.view.active {
  display: block;
}

.home-cols {
  display: grid;
  grid-template-columns: 240px 1fr 280px;
  height: calc(100% - 40px);
}

.home-footer {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.home-footer button {
  border: none;
  background: none;
  color: var(--color-text-2);
  font-size: 13px;
  padding: 4px 10px;
}

.home-footer button:hover {
  color: var(--color-primary);
}

.panel {
  min-width: 0;
  min-height: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
}

.panel.right {
  border-right: none;
  border-left: 1px solid var(--color-border);
}

.panel-title {
  padding: 10px 12px;
  font-weight: 700;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.panel-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 8px;
}

#tree-body {
  overflow-y: scroll;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

/* ---- Left tree ---- */
.tree-cat {
  font-size: 12px;
  color: var(--color-text-2);
  padding: 8px 6px 4px;
  font-weight: 700;
}

.tree-journal {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  border-radius: 6px;
  padding: 7px 10px;
  margin: 1px 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-journal:hover {
  background: #eff6ff;
}

.tree-journal.active {
  background: var(--color-primary);
  color: #fff;
}

.tree-journal .en {
  display: block;
  font-size: 11px;
  color: inherit;
  opacity: 0.7;
}

/* ---- Center content ---- */
.issue-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.issue-bar button {
  flex: none;
}

.issue-label {
  flex: 1;
  text-align: center;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cover-img {
  max-width: 160px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  display: block;
  margin: 0 auto 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.article-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  padding: 10px 12px;
  margin-bottom: 8px;
}

.article-item:hover {
  border-color: var(--color-primary);
}

.article-item .a-title {
  font-weight: 600;
  line-height: 1.45;
}

.article-item .a-meta {
  color: var(--color-text-2);
  font-size: 12px;
  margin-top: 4px;
}

.cta-box {
  padding: 40px 16px;
  text-align: center;
}

.cta-box button {
  display: block;
  margin: 10px auto;
  padding: 10px 28px;
  font-size: 15px;
}

/* ---- Right toc ---- */
.toc-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  border-bottom: 1px solid var(--color-border);
  padding: 8px 10px;
}

.toc-item:hover {
  background: #eff6ff;
}

.toc-item .toc-title {
  font-size: 13px;
  line-height: 1.4;
}

.toc-item .toc-meta {
  color: var(--color-text-2);
  font-size: 12px;
  margin-top: 2px;
}

/* ---- Reader ---- */
#reader-nav,
#page-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.reader-title {
  flex: 1;
  text-align: center;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-body {
  display: flex;
  height: calc(100% - 50px);
}

#reader-toc {
  width: 260px;
  overflow-y: auto;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: 8px;
  flex: none;
}

#reader-toc a {
  display: block;
  padding: 7px 10px;
  text-decoration: none;
  color: var(--color-text);
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

#reader-toc a:hover {
  background: #eff6ff;
}

#reader-toc a.active {
  background: var(--color-primary);
  color: #fff;
}

#reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px 60px;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.article-header h1 {
  font-size: 22px;
  line-height: 1.4;
  margin: 0 0 6px;
}

.article-header .trans-title {
  color: var(--color-text-2);
  font-size: 16px;
  margin-bottom: 10px;
}

.article-meta {
  color: var(--color-text-2);
  font-size: 13px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 12px;
  margin-bottom: 16px;
  display: grid;
  gap: 4px;
}

.ai-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.ai-result {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 10px 12px;
  margin-bottom: 16px;
  background: #fffbeb;
  white-space: pre-wrap;
  line-height: 1.6;
}

.ai-result h4 {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--color-accent);
}

.section-label {
  font-weight: 700;
  margin: 18px 0 8px;
}

.article-abstract {
  line-height: 1.7;
  background: #f9fafb;
  border-left: 3px solid var(--color-primary);
  padding: 10px 12px;
  border-radius: 0 6px 6px 0;
}

.article-content {
  line-height: 1.8;
  word-break: break-word;
}

.empty-tip {
  color: var(--color-text-2);
  text-align: center;
  padding: 40px 12px;
}

/* ---- Settings ---- */
.settings-toolbar {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.settings-wrap {
  height: calc(100% - 50px);
  overflow: auto;
}

#settings-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
}

#settings-table th,
#settings-table td {
  border: 1px solid var(--color-border);
  padding: 7px 8px;
  font-size: 13px;
  text-align: left;
  vertical-align: middle;
}

#settings-table th {
  background: #f9fafb;
  font-weight: 700;
  white-space: nowrap;
}

#settings-table tr.selected td {
  background: #eff6ff;
}

#settings-table td input,
#settings-table td select {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 13px;
}

#settings-table td .cell {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
  display: block;
}

#settings-table .sel {
  width: 34px;
  text-align: center;
}

#settings-table .crawl {
  width: 60px;
  text-align: center;
}

.crawl-btn {
  font-size: 12px;
  padding: 3px 8px;
}

/* ---- Journal Add ---- */
.add-wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px 60px;
  overflow-y: auto;
  height: calc(100% - 50px);
}

.add-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px 20px;
}

.add-block label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin: 12px 0 4px;
}

.add-block input,
.add-block textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  box-sizing: border-box;
}

.add-block input:focus,
.add-block textarea:focus {
  border-color: var(--color-primary);
}

.add-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.add-actions button {
  flex: 1;
  height: 36px;
}

.add-result {
  margin: 14px 0 0;
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
}

.add-result.ok {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #047857;
}

.add-result.warn {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
}

.add-result.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
}

/* ---- Info pages ---- */
.page-body {
  height: calc(100% - 50px);
  overflow-y: auto;
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 24px 60px;
  width: 100%;
}

.page-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

.page-block h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.page-block h3 {
  margin: 14px 0 6px;
  font-size: 15px;
}

.page-block p {
  line-height: 1.7;
  color: var(--color-text);
  margin: 6px 0;
}

.page-block ul {
  margin: 6px 0;
  padding-left: 20px;
}

.page-block li {
  line-height: 1.7;
  margin: 4px 0;
}

.page-block a {
  color: var(--color-primary);
  text-decoration: none;
}

.page-block a:hover {
  text-decoration: underline;
}

.contact-line {
  font-size: 15px;
  font-weight: 600;
}

/* ---- Toast ---- */
.toast {
  position: fixed;
  left: 50%;
  top: 64px;
  transform: translateX(-50%);
  background: rgba(17, 24, 39, 0.9);
  color: #fff;
  padding: 8px 16px;
  border-radius: 6px;
  z-index: 100;
  max-width: 80vw;
}

/* ---- Mobile tabs ---- */
.mobile-tabs {
  display: none;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .brand {
    font-size: 15px;
  }

  .search-wrap {
    max-width: none;
  }

  .mobile-tabs {
    display: flex;
    gap: 6px;
    padding: 6px 8px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
  }

  .mobile-tabs button {
    flex: 1;
  }

  .mobile-tabs button.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
  }

  .home-cols {
    display: block;
    height: calc(100% - 48px - 40px);
    overflow: hidden;
  }

  .home-footer {
    gap: 2px;
  }

  .home-footer button {
    padding: 4px 6px;
    font-size: 12px;
  }

  .panel {
    width: 100%;
    height: 100%;
    display: none;
    border: none;
  }

  .panel.show {
    display: flex;
  }

  #view-reader {
    position: relative;
  }

  #reader-toc {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 20;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
  }

  #reader-content {
    padding: 14px 16px 60px;
  }

  .article-header h1 {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  #app-header {
    gap: 8px;
    padding: 0 10px;
  }

  #settings-btn,
  #lang-toggle,
  #register-btn,
  #login-btn,
  #logout-btn {
    padding: 6px 8px;
  }

  #user-name {
    max-width: 72px;
  }

  #settings-table th,
  #settings-table td {
    font-size: 12px;
    padding: 5px 6px;
  }
}