/* 工具馆 · 图书馆风（各工具页共用） */
@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,650;9..144,700&family=Source+Sans+3:wght@400;500;600;700&display=swap");

:root {
  --lb-bg: #1a1410;
  --lb-wall: #231c16;
  --lb-panel: #2a221b;
  --lb-wood: #3a2c22;
  --lb-input: #15110e;
  --lb-ledge: #5c4634;
  --lb-ledge-edge: #7a5e44;
  --lb-bone: #f0e6d6;
  --lb-muted: #b8a894;
  --lb-dim: #7d6f5e;
  --lb-brass: #d4b57a;
  --lb-brass-dim: rgba(212, 181, 122, 0.16);
  --lb-brass-border: rgba(212, 181, 122, 0.35);
  --lb-border: rgba(92, 70, 52, 0.55);
  --lb-border-soft: rgba(74, 58, 44, 0.8);
  --lb-success: #9bbb8a;
  --lb-error: #c97a6a;
  --lb-link: #c4a882;
  --lb-string: #c9a07a;
  --lb-number: #9aaa7a;
  --lb-bool: #7a9ab8;
  --lb-serif: "Fraunces", "Noto Serif SC", "Songti SC", Georgia, serif;
  --lb-sans: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
  --lb-mono: Consolas, Monaco, "Cascadia Mono", monospace;
  color-scheme: dark;
}

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

html {
  background: var(--lb-bg);
}

body {
  margin: 0;
  min-height: 100%;
  height: 100vh;
  overflow: hidden;
  display: flex;
  color: var(--lb-bone);
  font-family: var(--lb-sans);
  background:
    radial-gradient(ellipse 70% 50% at 50% -10%, rgba(212, 181, 122, 0.08), transparent 55%),
    radial-gradient(ellipse 40% 30% at 90% 80%, rgba(90, 46, 50, 0.1), transparent 50%),
    linear-gradient(180deg, #1f1813 0%, var(--lb-bg) 40%, #15110e 100%);
  color-scheme: dark;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.28;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

a {
  color: inherit;
  text-decoration: none;
}

/* —— 侧栏（书架目录） —— */
.sidebar {
  position: relative;
  z-index: 2;
  width: 220px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: rgba(26, 20, 16, 0.92);
  border-right: 1px solid var(--lb-border);
  backdrop-filter: blur(12px);
}

.sidebar-nav {
  padding: 20px 14px 12px;
  flex: 1;
  min-height: 0;
  overflow: auto;
}

.logo {
  margin-bottom: 22px;
  padding: 0 4px;
}

.logo .site-name {
  display: block;
  font-family: var(--lb-serif);
  font-size: 20px;
  font-style: italic;
  font-weight: 500;
  color: var(--lb-brass);
  letter-spacing: 0.02em;
}

.logo .site-name:hover {
  color: var(--lb-bone);
}

.logo p {
  margin: 6px 0 0;
  font-size: 11px;
  color: var(--lb-dim);
  line-height: 1.45;
  letter-spacing: 0.04em;
}

.logo-back {
  display: inline-block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--lb-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.logo-back:hover {
  color: var(--lb-brass);
  border-bottom-color: var(--lb-brass-border);
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu li {
  margin-bottom: 4px;
}

.nav-menu li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  color: var(--lb-muted);
  font-size: 13px;
  border: 1px solid transparent;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.nav-menu li a:hover {
  color: var(--lb-bone);
  background: rgba(58, 44, 34, 0.45);
}

.nav-menu li a.active {
  color: var(--lb-brass);
  background: var(--lb-brass-dim);
  border-color: var(--lb-brass-border);
  font-weight: 600;
}

.sidebar-ad {
  margin-top: auto;
  padding: 12px 10px;
  border-top: 1px solid var(--lb-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ad-promo {
  display: block;
  overflow: hidden;
  text-decoration: none;
  border: 1px solid var(--lb-border);
  transition: opacity 0.2s, border-color 0.2s;
}

.ad-promo:hover {
  opacity: 0.92;
  border-color: var(--lb-brass-border);
}

.ad-promo-img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.ad-box {
  background: rgba(42, 34, 27, 0.85);
  border: 1px solid var(--lb-border);
  padding: 10px 8px;
  font-size: 12px;
  color: var(--lb-dim);
}

.ad-box .contact-label {
  font-size: 11px;
  color: var(--lb-muted);
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ad-box .contact-row {
  margin: 6px 0 0;
  font-size: 10px;
  line-height: 1.4;
}

.ad-box .contact-email {
  color: var(--lb-link);
  text-decoration: none;
  white-space: nowrap;
  font-size: 10px;
}

.ad-box .contact-email:hover {
  text-decoration: underline;
  color: var(--lb-brass);
}

/* —— 主区 —— */
.main-content {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-width: 0;
  background: transparent;
}

/* —— 顶栏 —— */
.toolbar {
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
  background: rgba(35, 28, 22, 0.88);
  border-bottom: 1px solid var(--lb-border);
  box-shadow: inset 0 1px 0 rgba(212, 181, 122, 0.06);
  backdrop-filter: blur(10px);
}

h1.toolbar-title,
.toolbar-title {
  font-family: var(--lb-serif);
  font-size: 16px;
  font-weight: 650;
  color: var(--lb-bone);
  margin: 0;
  flex-shrink: 0;
  margin-right: 4px;
  letter-spacing: 0.01em;
}

.toolbar button,
.toolbar .btn,
button.btn {
  font-family: inherit;
  background: rgba(58, 44, 34, 0.85);
  color: var(--lb-muted);
  border: 1px solid var(--lb-border);
  padding: 6px 12px;
  border-radius: 0;
  font-size: 12px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.toolbar button:hover,
.toolbar .btn:hover,
button.btn:hover {
  color: var(--lb-bone);
  border-color: var(--lb-ledge-edge);
  background: rgba(74, 58, 44, 0.9);
}

.toolbar .btn-primary,
.toolbar .btn-green,
.btn-primary {
  background: var(--lb-brass);
  color: var(--lb-bg);
  border-color: var(--lb-brass);
  font-weight: 600;
}

.toolbar .btn-primary:hover,
.toolbar .btn-green:hover,
.btn-primary:hover {
  background: #e0c48e;
  border-color: #e0c48e;
  color: var(--lb-bg);
}

.btn-secondary,
.toolbar .btn-secondary {
  background: rgba(58, 44, 34, 0.85);
  color: var(--lb-muted);
  border: 1px solid var(--lb-border);
  font-weight: 400;
}

.btn-secondary:hover,
.toolbar .btn-secondary:hover {
  color: var(--lb-bone);
  border-color: var(--lb-ledge-edge);
  background: rgba(74, 58, 44, 0.9);
}

.toolbar-spacer {
  flex: 1;
  margin-left: auto;
}

.toolbar-compare-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  background: rgba(26, 20, 16, 0.55);
  border: 1px solid var(--lb-border);
}

.toolbar-compare-group button {
  background: rgba(58, 44, 34, 0.7);
  color: var(--lb-muted);
}

.toolbar-compare-group button:hover {
  color: var(--lb-bone);
  background: rgba(74, 58, 44, 0.9);
}

.toolbar-compare-group button.btn-compare-active {
  background: var(--lb-brass-dim);
  color: var(--lb-brass);
  box-shadow: inset 0 0 0 1px var(--lb-brass-border);
}

.toolbar-compare-group button.btn-compare-active:hover {
  background: rgba(212, 181, 122, 0.24);
  color: var(--lb-bone);
}

/* —— 面板 / 卡片 —— */
.panel,
.card {
  background: rgba(42, 34, 27, 0.92);
  border: 1px solid var(--lb-border);
  border-radius: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  box-shadow: inset 0 1px 0 rgba(212, 181, 122, 0.04);
}

.panel-header,
.card-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--lb-border);
  font-size: 13px;
  color: var(--lb-brass);
  font-weight: 600;
  font-family: var(--lb-serif);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header {
  margin-bottom: 12px;
  padding-bottom: 10px;
}

.card-title,
.panel-header {
  font-family: var(--lb-serif);
  color: var(--lb-brass);
}

.panel-body,
.card-content {
  flex: 1;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}

.panel-header-actions button,
.editor-header-actions button {
  background: none;
  border: none;
  color: var(--lb-dim);
  cursor: pointer;
  font-size: 12px;
  padding: 0;
  font-family: inherit;
}

.panel-header-actions button:hover,
.editor-header-actions button:hover {
  color: var(--lb-brass);
}

/* —— 表单 —— */
.field label,
.input-group label {
  display: block;
  font-size: 12px;
  color: var(--lb-muted);
  margin-bottom: 4px;
}

.field input,
.field select,
.input-group input,
.input-group textarea,
.input-group select {
  width: 100%;
  padding: 8px 10px;
  background: var(--lb-input);
  border: 1px solid var(--lb-border);
  border-radius: 0;
  color: var(--lb-bone);
  font-size: 13px;
  font-family: inherit;
}

.field input:focus,
.field select:focus,
.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--lb-brass-border);
  box-shadow: 0 0 0 1px rgba(212, 181, 122, 0.12);
}

.input-group textarea {
  font-family: var(--lb-mono);
  resize: vertical;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
  color: var(--lb-muted);
}

.options label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.hint {
  font-size: 11px;
  color: var(--lb-dim);
}

.status {
  font-size: 12px;
  color: var(--lb-success);
  min-height: 1.2em;
}

.status.error,
.error-message {
  color: var(--lb-error);
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.presets button {
  background: rgba(58, 44, 34, 0.85);
  color: var(--lb-muted);
  border: 1px solid var(--lb-border);
  padding: 5px 10px;
  border-radius: 0;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
}

.presets button:hover {
  color: var(--lb-bone);
  border-color: var(--lb-ledge-edge);
}

/* —— 编辑器区 —— */
.editor-header {
  padding: 8px 16px;
  background: rgba(42, 34, 27, 0.95);
  font-size: 13px;
  color: var(--lb-dim);
  border-bottom: 1px solid var(--lb-border);
  font-family: var(--lb-serif);
}

.editor,
.result-out,
.base64-out {
  flex: 1;
  background: var(--lb-input);
  color: var(--lb-bone);
  border: none;
  outline: none;
  padding: 16px;
  font-family: var(--lb-mono);
  font-size: 13px;
  line-height: 1.6;
  resize: none;
  overflow: auto;
}

.result-out,
.base64-out {
  border: 1px solid var(--lb-border);
  padding: 12px 14px;
  min-height: 160px;
  width: 100%;
}

.result-out:focus,
.base64-out:focus {
  outline: none;
  border-color: var(--lb-brass-border);
}

.splitter {
  width: 5px;
  background-color: var(--lb-wood);
  cursor: col-resize;
  position: relative;
  user-select: none;
  flex-shrink: 0;
}

.splitter:hover {
  background-color: var(--lb-brass);
}

.splitter::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 1px;
  height: 20px;
  background-color: var(--lb-dim);
}

.dropzone {
  border: 1px dashed var(--lb-border);
  padding: 24px 16px;
  text-align: center;
  color: var(--lb-dim);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s;
  background: rgba(26, 20, 16, 0.4);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--lb-brass-border);
  background: var(--lb-brass-dim);
  color: var(--lb-muted);
}

.dropzone input {
  display: none;
}

.copy-btn {
  background: var(--lb-brass);
  color: var(--lb-bg);
  border: 1px solid var(--lb-brass);
  padding: 10px 14px;
  border-radius: 0;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  transition: background 0.15s;
}

.copy-btn:hover {
  background: #e0c48e;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
    height: auto;
    min-height: 100vh;
    overflow: auto;
  }

  .sidebar {
    width: 100%;
    height: auto;
    flex-direction: row;
    border-right: none;
    border-bottom: 1px solid var(--lb-border);
  }

  .sidebar-nav {
    flex: 1;
    padding: 12px 14px;
    overflow: visible;
  }

  .logo {
    margin-bottom: 10px;
  }

  .logo .site-name {
    font-size: 17px;
  }

  .logo p,
  .logo-back {
    display: none;
  }

  .nav-menu {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
  }

  .nav-menu li {
    margin-bottom: 0;
  }

  .nav-menu li a {
    padding: 6px 10px;
    font-size: 12px;
  }

  .sidebar-ad {
    display: none;
  }

  .main-content {
    height: auto;
    min-height: calc(100vh - 120px);
  }

  .toolbar {
    height: auto;
    min-height: 45px;
    padding: 8px 12px;
    flex-wrap: wrap;
  }

  .toolbar button {
    padding: 5px 10px;
    font-size: 12px;
  }

  .splitter {
    width: 100%;
    height: 5px;
    cursor: row-resize;
  }

  .splitter::before {
    width: 20px;
    height: 1px;
  }
}

@media (max-width: 480px) {
  .logo .site-name {
    font-size: 15px;
  }

  .toolbar button {
    padding: 4px 8px;
    font-size: 11px;
  }
}