:root {
  --bg: #eff8ff;
  --bg-soft: #e1f0fd;
  --ink: #11293c;
  --ink-2: #274b64;
  --ink-3: #476b85;
  --ink-4: #7e9bb1;
  --line: #cbe1f4;
  --card: #ffffff;
  --primary: #2f93e0;
  --primary-light: #6ec1f5;
  --primary-soft: #93c9ee;
  --primary-dark: #1c6fb3;
  --indigo: #5b6ff0;
  --violet: #7b6cf6;
  --mint: #2bb3a3;
  --accent: #f2994a;
  --accent-soft: #f8c99b;
  --danger: #d64545;
  --success: #2a9d8f;
  --warn: #e0a800;
  --shadow-sm: 0 1px 2px rgba(18, 53, 80, 0.06), 0 4px 14px rgba(18, 53, 80, 0.05);
  --shadow: 0 10px 30px rgba(18, 53, 80, 0.1), 0 2px 6px rgba(18, 53, 80, 0.05);
  --shadow-lg: 0 28px 64px rgba(18, 53, 80, 0.16), 0 4px 12px rgba(18, 53, 80, 0.06);
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-family: "Inter", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); -webkit-font-smoothing: antialiased; line-height: 1.55; }
body {
  min-height: 100vh;
  background: linear-gradient(180deg, #eaf6ff 0%, #f6fbff 45%, #fdfeff 100%);
  background-attachment: fixed;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(18, 53, 80, 0.08);
  padding: 12px 20px;
}
.site-header .hd-inner {
  max-width: 1180px; margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr minmax(280px, 620px) 1fr;
  align-items: center; gap: 20px;
}
.site-header .brand {
  justify-self: start;
  font-weight: 800; font-size: 1.15rem; color: var(--ink);
  display: flex; align-items: center; gap: 8px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.site-header .brand-logo {
  width: 32px; height: 32px; border-radius: 10px;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px; flex-shrink: 0;
}
.site-header .brand a {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none;
}
.site-header .hd-search { width: 100%; }
.site-header .hd-search form { display: flex; gap: 8px; position: relative; }
.site-header .hd-search .search-field { position: relative; flex: 1; min-width: 0; display: flex; }
.site-header .hd-search input[type="text"] {
  flex: 1; min-width: 0; width: 100%;
  padding: 11px 40px 11px 18px;
  font-size: 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: inset 0 1px 2px rgba(18, 53, 80, 0.05);
  transition: border var(--transition), box-shadow var(--transition);
}
.site-header .hd-search input[type="text"]:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(47, 147, 224, 0.14), inset 0 1px 2px rgba(18, 53, 80, 0.04);
}
.site-header .hd-search .search-clear {
  position: absolute; right: 9px; top: 50%;
  transform: translateY(-50%);
  width: 22px; height: 22px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  border: none; border-radius: 50%;
  background: var(--bg-soft); color: var(--ink-4);
  font-size: 11px; line-height: 1; cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.site-header .hd-search .search-clear:hover { background: var(--line); color: var(--ink-2); }
.site-header .hd-search .search-clear[hidden] { display: none; }
.site-header .hd-search button[type="submit"] {
  padding: 11px 22px; border-radius: 999px;
  border: none; cursor: pointer; font-weight: 700;
  background: var(--primary); color: #fff;
  transition: background var(--transition);
}
.site-header .hd-search button[type="submit"]:hover { background: var(--primary-dark); }
.site-header .hd-search button[type="submit"]:active { transform: translateY(1px); }
.site-header .hd-right { display: flex; gap: 8px; align-items: center; justify-self: end; }

main {
  position: relative; z-index: 1;
  max-width: 1180px; margin: 28px auto 60px;
  padding: 0 20px;
}

.hero {
  position: relative;
  min-height: calc(100vh - 230px);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 40px 0 64px;
}
.hero::before {
  content: 'H₂O';
  position: absolute; right: -0.04em; bottom: -0.14em;
  font-family: var(--mono);
  font-size: clamp(9rem, 20vw, 16rem);
  font-weight: 700; line-height: 1;
  letter-spacing: -0.09em;
  color: rgba(47, 147, 224, 0.06);
  pointer-events: none; user-select: none; white-space: nowrap;
}
.hero > * { position: relative; z-index: 1; }
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2.2rem, 7.5vw, 4.6rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.hero h1 .t-solid { color: var(--ink); }
.hero h1 .t-hollow {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 700;
  color: rgba(47, 147, 224, 0.1);
  -webkit-text-stroke: 1.5px var(--primary);
  margin-left: 0.05em;
}
@supports not (-webkit-text-stroke: 1px #000) {
  .hero h1 .t-hollow { color: var(--primary-light); }
}
.hero-rule {
  display: block;
  width: 56px; height: 3px;
  margin: 0 auto 30px;
  border-radius: 999px;
  background: var(--primary);
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.06s both;
}
.hero-tip {
  color: var(--ink-3);
  margin: 0 0 18px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.12s both;
}

.hero-search {
  display: flex; gap: 8px;
  width: 100%; max-width: 580px;
  margin: 0 auto 12px;
  text-align: left;
  /* 高于 hero 内其它元素，避免自动补全下拉被提示文字/示例列盖住 */
  position: relative; z-index: 5;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.12s both;
}
.hero-search .search-field { position: relative; flex: 1; min-width: 0; display: flex; }
.hero-search input[type="text"] {
  flex: 1; min-width: 0; width: 100%;
  padding: 14px 44px 14px 20px;
  font-size: 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  box-shadow: 0 6px 20px rgba(18, 53, 80, 0.06);
  transition: border var(--transition), box-shadow var(--transition);
}
.hero-search input[type="text"]::placeholder { color: var(--ink-4); }
.hero-search input[type="text"]:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(47, 147, 224, 0.14);
}
.hero-search .search-clear {
  position: absolute; right: 12px; top: 50%;
  transform: translateY(-50%);
  width: 24px; height: 24px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  border: none; border-radius: 50%;
  background: var(--bg-soft); color: var(--ink-4);
  font-size: 11px; line-height: 1; cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.hero-search .search-clear:hover { background: var(--line); color: var(--ink-2); }
.hero-search .search-clear[hidden] { display: none; }
.hero-search button[type="submit"] {
  padding: 14px 26px; border-radius: 999px;
  border: none; cursor: pointer; font-weight: 700; font-size: 0.95rem;
  background: var(--primary); color: #fff;
  white-space: nowrap;
  transition: background var(--transition);
}
.hero-search button[type="submit"]:hover { background: var(--primary-dark); }
.hero-search button[type="submit"]:active { transform: translateY(1px); }
.hero-hint {
  color: var(--ink-4);
  margin: 0 0 30px;
  font-size: 0.86rem;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.16s both;
}

html.is-home .site-header .hd-search { display: none; }
html.is-home .site-header .hd-inner { grid-template-columns: 1fr auto; }
body.is-home .site-header .hd-search { display: none; }
body.is-home .site-header .hd-inner { grid-template-columns: 1fr auto; }
.hero-cols {
  display: grid; grid-template-columns: 1fr 1fr;
  width: 100%; max-width: 900px;
  margin: 6px auto 0;
  text-align: left;
}
.hero-col { min-width: 0; padding: 0 44px; }
.hero-col + .hero-col { border-left: 1px solid var(--line); }
.hero-col-title {
  margin: 0 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 0.74rem; font-weight: 800;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-4);
}
.hero-cols .chips {
  justify-content: flex-start;
  animation-delay: 0.24s;
}
.chips {
  display: flex; flex-wrap: wrap; gap: 10px;
  justify-content: center; padding: 0;
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) 0.18s both;
}
.chip {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-3);
  font-family: var(--mono); font-size: 0.86rem;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.chip:hover {
  color: var(--primary-dark);
  border-color: var(--primary);
  background: rgba(47, 147, 224, 0.06);
  text-decoration: none;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero h1, .hero-rule, .hero-tip, .chips { animation: none; }
}

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: 999px;
  border: 1px solid transparent; cursor: pointer;
  font-weight: 600; font-size: 0.92rem;
  transition: all var(--transition);
  background: transparent; color: var(--ink);
  text-decoration: none; line-height: 1;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 3px 10px rgba(47, 147, 224, 0.26);
}
.btn-primary:hover {
  background: var(--primary-dark); color: #fff; text-decoration: none;
  box-shadow: 0 5px 14px rgba(47, 147, 224, 0.32);
}
.btn-ghost {
  border-color: var(--line); background: #fff; color: var(--ink-2);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-link { background: transparent; color: var(--ink-3); border-color: var(--line); }
.btn-link:hover { color: var(--primary-dark); border-color: var(--primary); background: #fff; }
.btn-sm { padding: 6px 14px; font-size: 0.85rem; }

.back-home-bar { margin-bottom: 14px; }
.back-home {
  display: inline-flex; align-items: center;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink-3);
  font-size: 0.86rem; font-weight: 600;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.back-home:hover {
  color: var(--primary-dark);
  border-color: var(--primary);
  background: #fff;
  text-decoration: none;
}
.result-header { margin-bottom: 22px; }
.eq-large-wrap {
  position: relative;
  background: linear-gradient(180deg, #ffffff 0%, #f5fbff 100%);
  border: 1px solid rgba(47, 147, 224, 0.18);
  border-radius: var(--radius);
  padding: 34px 30px;
  box-shadow: var(--shadow-sm);
  display: flex; align-items: center; gap: 20px;
  flex-wrap: wrap;
  font-size: clamp(1.4rem, 3.2vw, 2.2rem);
  line-height: 1.6;
  overflow-x: auto; overflow-y: hidden;
}
@media (max-width: 640px) {
  .eq-large-wrap { padding: 20px 16px; font-size: 1.15rem; }
}
.eq-side { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.equation-main {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 8px 12px; width: 100%;
}
.eq-arrow {
  font-size: 1.6em; color: var(--primary); font-weight: 600;
  padding: 0 4px; flex-shrink: 0;
}
.q-mark {
  font-size: 1.4em; color: var(--accent); font-weight: 700;
}
.meta-row {
  margin-top: 14px; display: flex; gap: 14px; flex-wrap: wrap;
  align-items: center; justify-content: flex-end;
}
.id-badge {
  margin-right: auto;
  font-family: var(--mono); font-size: 0.76rem; font-weight: 700;
  color: var(--ink-4); background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 10px; letter-spacing: 0.03em;
  cursor: help;
}
.toggle-ox {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.92rem; color: var(--ink-3); cursor: pointer;
}
.toggle-ox input[type="checkbox"] { accent-color: var(--primary); width: 16px; height: 16px; }

.species {
  display: inline-flex; align-items: baseline; gap: 0;
  font-family: var(--mono); font-feature-settings: "tnum";
}
.species .coef {
  color: var(--accent); font-weight: 700;
  font-size: 0.78em; padding-right: 3px;
}
.species .formula { display: inline-flex; align-items: baseline; }
.species .formula .el {
  font-weight: 600; color: var(--ink);
  font-size: 1em;
}
.species .formula sub {
  font-size: 0.72em; color: var(--ink-3);
  margin: 0 0 0 -1px;
}
.species .formula .sep { color: var(--ink-4); margin: 0 1px; }
.species .formula .hydrate {
  color: var(--ink-4); font-size: 0.78em; margin-right: 1px;
}
/* 氧化数标注：位于对应元素正下方（不占右侧空间） */
.species .formula .el-ox {
  display: inline-flex; flex-direction: column;
  align-items: center;
  vertical-align: baseline;
  margin: 0 2px;
  padding-bottom: 0.1em;
}
.species .formula .el-ox .el { line-height: 1.1; }
.species .formula .ox {
  font-size: 0.46em; font-weight: 700;
  line-height: 1.1; letter-spacing: 0.01em;
  color: var(--primary);
  white-space: nowrap;
  font-family: var(--mono);
}
.species .formula .el-ox.up .ox { color: var(--danger); }
.species .formula .el-ox.down .ox { color: #1a6fb5; }
.species .formula sup.charge {
  color: var(--primary); font-weight: 600;
  font-size: 0.66em; margin-left: 1px;
}
.species .state {
  font-size: 0.58em;
  padding: 1px 6px; margin-left: 4px;
  border-radius: 999px;
  background: var(--bg-soft); color: var(--ink-3);
  border: 1px solid var(--line);
  vertical-align: middle;
}
.species .state[data-st="g"] {
  background: rgba(242, 153, 74, 0.12); color: #b56f1f; border-color: rgba(242, 153, 74, 0.3);
}
.species .state[data-st="l"] {
  background: rgba(43, 179, 163, 0.12); color: #1c7f74; border-color: rgba(43, 179, 163, 0.28);
}
.species .state[data-st="aq"] {
  background: rgba(47, 147, 224, 0.12); color: var(--primary-dark); border-color: rgba(47, 147, 224, 0.28);
}
.species .state[data-st="s"] {
  background: rgba(126, 155, 177, 0.14); color: #55748c; border-color: rgba(126, 155, 177, 0.3);
}
.plus {
  color: var(--ink-4); font-weight: 700; padding: 0 4px;
}

.analysis-blocks {
  display: grid; gap: 16px; margin-bottom: 26px;
}
.block {
  position: relative;
  background: #fff;
  border: 1px solid rgba(18, 53, 80, 0.07);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}
.block h3 {
  display: flex; align-items: center; gap: 9px;
  margin: 0 0 12px; font-size: 1rem;
  color: var(--primary-dark); font-weight: 800; letter-spacing: 0.01em;
}
.block h3::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}
.block .lead { font-weight: 600; color: var(--ink-2); margin: 0 0 8px; }
.block p { margin: 4px 0; }
.block code { background: var(--bg-soft); padding: 2px 6px; border-radius: 6px; font-family: var(--mono); }
.block-acidbase { border-left-color: var(--violet); }
.block-acidbase h3 { color: #544aa8; }
.block-redox { border-left-color: var(--accent); }
.block-redox h3 { color: #c1731f; }

.redox-list { display: grid; gap: 10px; margin-top: 8px; }
.redox-item {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  padding: 10px 15px; border-radius: var(--radius-sm);
  background: #fff; border: 1px solid rgba(18, 53, 80, 0.08);
  box-shadow: 0 2px 8px rgba(18, 53, 80, 0.05);
  font-family: var(--mono); font-size: 0.9rem;
}
.redox-item.up {
  border-left: 4px solid var(--danger);
  background: linear-gradient(180deg, #ffffff, #fff7f6);
}
.redox-item.down {
  border-left: 4px solid #1a6fb5;
  background: linear-gradient(180deg, #ffffff, #f5faff);
}
.rx-el { font-weight: 800; font-size: 1.05em; color: var(--ink); min-width: 30px; }
.rx-flow { display: inline-flex; align-items: center; gap: 6px; }
.rx-state {
  padding: 1px 9px; border-radius: 8px;
  background: #fff; border: 1px solid var(--line);
  color: var(--ink-2); font-weight: 600;
}
.rx-arrow { font-weight: 700; font-size: 1.1em; }
.redox-item.up .rx-arrow { color: var(--danger); }
.redox-item.down .rx-arrow { color: #1a6fb5; }
.rx-meta { color: var(--ink-4); font-size: 0.86em; }
.rx-e { color: var(--ink-3); font-size: 0.86em; }
.rx-badge {
  margin-left: auto; padding: 3px 11px; border-radius: 999px;
  font-size: 0.74rem; font-weight: 800; font-family: inherit;
}
.redox-item.up .rx-badge { background: rgba(214, 69, 69, 0.12); color: var(--danger); }
.redox-item.down .rx-badge { background: rgba(26, 111, 181, 0.12); color: #1a6fb5; }

.agent-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.agent-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 13px; border-radius: 999px;
  background: #fff; border: 1px dashed var(--line);
  font-size: 0.86rem; box-shadow: 0 2px 6px rgba(18, 53, 80, 0.04);
}
.agent-chip .agent-role { color: var(--ink-4); font-size: 0.82em; }
.agent-chip.oxidizing { border-color: rgba(214, 69, 69, 0.38); background: rgba(255, 247, 246, 0.9); }
.agent-chip.reducing { border-color: rgba(26, 111, 181, 0.38); background: rgba(245, 250, 255, 0.9); }
.block-precipitate { border-left-color: var(--violet); }
.block-precipitate h3 { color: #544aa8; }
.block-gas { border-left-color: var(--indigo); }
.block-gas h3 { color: #3b52c4; }

.species-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  margin-bottom: 24px;
}
@media (max-width: 760px) { .species-wrap { grid-template-columns: 1fr; } }
.species-list h2 {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.8rem; font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--primary-dark);
  margin: 0 0 12px;
  text-transform: uppercase;
}
.species-list h2::before {
  content: ''; width: 18px; height: 2px; border-radius: 2px;
  background: var(--primary);
}
.species-grid { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.species-card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(18, 53, 80, 0.07);
  border-radius: var(--radius);
  padding: 17px 20px 18px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.species-card:hover {
  border-color: rgba(47, 147, 224, 0.3);
  box-shadow: var(--shadow);
}
.sc-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 6px; }
.sc-formula { font-size: 1.35rem; }
.sc-names .sc-zh { font-weight: 700; color: var(--ink); font-size: 1.05rem; }
.sc-names .sc-en { color: var(--ink-3); font-size: 0.88rem; }

.sc-props { display: grid; gap: 6px; margin: 12px 0 0; }
.sc-prop {
  display: grid; grid-template-columns: 5.2em minmax(0, 1fr);
  gap: 10px; align-items: baseline;
  padding-top: 6px;
  border-top: 1px dashed rgba(18, 53, 80, 0.08);
  font-size: 0.84rem; line-height: 1.55;
}
.sc-prop:first-child { border-top: none; padding-top: 0; }
.sc-prop dt { color: var(--ink-4); font-weight: 600; white-space: nowrap; }
.sc-prop dd { margin: 0; color: var(--ink-2); min-width: 0; word-break: break-word; }
.sc-prop .ox-chips { margin-top: 0; }
.sc-tag {
  display: inline-block; padding: 1px 9px; border-radius: 999px;
  background: var(--bg-soft); border: 1px solid var(--line);
  font-size: 0.78rem; font-weight: 700; color: var(--ink-2);
}
.sc-tag.cat-element { background: rgba(47, 147, 224, 0.08); border-color: rgba(47, 147, 224, 0.26); color: var(--primary-dark); }
.sc-tag.cat-acid { background: rgba(192, 57, 43, 0.08); border-color: rgba(192, 57, 43, 0.26); color: var(--danger); }
.sc-tag.cat-base { background: rgba(122, 88, 156, 0.1); border-color: rgba(122, 88, 156, 0.28); color: #7a589c; }
.sc-tag.cat-salt { background: rgba(59, 107, 189, 0.08); border-color: rgba(59, 107, 189, 0.26); color: #3b6bbd; }
.sc-tag.cat-oxide { background: rgba(224, 122, 63, 0.1); border-color: rgba(224, 122, 63, 0.28); color: #b25a22; }
.sc-tag.cat-organic { background: rgba(26, 138, 95, 0.1); border-color: rgba(26, 138, 95, 0.28); color: var(--success); }
.sc-tag.cat-ion, .sc-tag.cat-electron { background: rgba(26, 111, 181, 0.1); border-color: rgba(26, 111, 181, 0.28); color: #1a6fb5; }
.val-strong { font-family: var(--mono); font-weight: 700; color: var(--ink); }
.cmp-wrap { display: inline-flex; flex-wrap: wrap; gap: 4px 12px; }
.cmp-item { display: inline-flex; align-items: baseline; gap: 4px; font-family: var(--mono); }
.cmp-el { font-weight: 700; color: var(--ink); }
.cmp-pct { color: var(--ink-4); font-size: 0.86em; }
.role-chips { display: inline-flex; flex-wrap: wrap; gap: 5px; }
.role-chip {
  padding: 1px 9px; border-radius: 999px;
  font-size: 0.76rem; font-weight: 700;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--ink-3);
}
.role-chip.oxidizing { color: var(--danger); background: rgba(192, 57, 43, 0.08); border-color: rgba(192, 57, 43, 0.26); }
.role-chip.reducing { color: #1a6fb5; background: rgba(26, 111, 181, 0.08); border-color: rgba(26, 111, 181, 0.26); }
.role-chip.acid { color: #b25a22; background: rgba(224, 122, 63, 0.1); border-color: rgba(224, 122, 63, 0.28); }
.role-chip.base { color: #7a589c; background: rgba(122, 88, 156, 0.1); border-color: rgba(122, 88, 156, 0.28); }
.role-chip.precipitate { color: #7a589c; background: rgba(122, 88, 156, 0.08); border-color: rgba(122, 88, 156, 0.24); }
.role-chip.gas { color: #3b6bbd; background: rgba(59, 107, 189, 0.08); border-color: rgba(59, 107, 189, 0.24); }
.sc-more { font-size: 0.84rem; font-weight: 600; }
.compound-props { margin-top: 16px; }

.similar-results { margin-top: 28px; }
.similar-head {
  display: flex; flex-direction: column; gap: 4px;
  padding-left: 16px; border-left: 3px solid var(--primary);
}
.similar-head h2 { margin: 0 0 6px; font-size: 1.35rem; color: var(--ink); letter-spacing: -0.01em; font-weight: 800; }
.similar-head p { margin: 0; }
.similar-results .related-grid { margin-top: 18px; }
.empty-results {
  margin-top: 26px; padding: 34px 28px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid rgba(47, 147, 224, 0.16);
  text-align: center;
}
.empty-results h2 { margin: 0 0 8px; font-size: 1.3rem; color: var(--ink); font-weight: 800; }
.empty-results p { margin: 0 auto; max-width: 42em; }
.ox-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 9px; }
.ox-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px; border-radius: 999px;
  background: var(--bg-soft); border: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.74rem; color: var(--ink-3);
  line-height: 1.5;
}
.ox-chip .chip-el { font-weight: 700; color: var(--ink); }
.ox-chip .ox-tag { font-style: normal; font-weight: 700; font-size: 0.92em; }
.ox-chip.up { background: rgba(192, 57, 43, 0.08); border-color: rgba(192, 57, 43, 0.28); color: var(--danger); }
.ox-chip.up .chip-el, .ox-chip.up .chip-dir { color: var(--danger); }
.ox-chip.down { background: rgba(26, 111, 181, 0.08); border-color: rgba(26, 111, 181, 0.28); color: #1a6fb5; }
.ox-chip.down .chip-el, .ox-chip.down .chip-dir { color: #1a6fb5; }
.species-card.is-changed {
  border-color: rgba(242, 153, 74, 0.4);
  background: #fffdf9;
}

.related-grid {
  display: grid; gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 24px;
}
.related-box {
  position: relative;
  background: #fff;
  border: 1px solid rgba(18, 53, 80, 0.07);
  border-radius: var(--radius);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-sm);
}
.related-box h3 {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 12px; padding-bottom: 11px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem; font-weight: 800;
  color: var(--ink-2);
}
.related-box h3::before {
  content: ''; width: 3px; height: 14px; border-radius: 2px;
  background: var(--primary); flex-shrink: 0;
}
.related-list { list-style: none; padding: 0; margin: 0; counter-reset: idx; }
.related-list li {
  counter-increment: idx;
  padding: 10px 8px; border-top: 1px solid rgba(203, 225, 244, 0.6);
  display: flex; gap: 10px; align-items: center;
  border-radius: 8px;
  font-family: var(--mono); font-size: 0.9rem;
  transition: background var(--transition);
}
.related-list li:hover { background: rgba(47, 147, 224, 0.06); }
.related-list li:first-child { border-top: none; }
.related-list .idx {
  color: var(--primary-dark); width: 22px; height: 22px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 700; flex-shrink: 0;
  border-radius: 7px; background: rgba(47, 147, 224, 0.1);
}
.related-list a { color: var(--ink-2); }
.related-list a:hover { color: var(--primary); text-decoration: underline; }

.pagination {
  list-style: none; padding: 0; margin: 14px 0 0;
  display: flex; gap: 4px; flex-wrap: wrap;
  font-size: 0.85rem;
}
.pagination li a {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 34px; height: 34px; padding: 0 10px;
  border-radius: 10px;
  background: #fff;
  color: var(--ink-2); border: 1px solid var(--line);
  font-weight: 600; transition: all var(--transition);
}
.pagination li.active a {
  background: var(--primary); color: #fff; border-color: var(--primary);
}
.pagination li a:hover {
  border-color: var(--primary); color: var(--primary-dark);
  background: #fff;
}
.pagination li.active a:hover { color: #fff; background: var(--primary-dark); }
.pagination li span {
  min-width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-4);
}

.multi { text-align: center; }
.multi .eq-large-wrap { justify-content: center; margin-bottom: 22px; }
.multi h2 { font-size: 1.4rem; margin: 0 0 8px; color: var(--ink); }
.multi table.table-multi { max-width: 760px; margin: 0 auto; }

table.table-multi {
  width: 100%; border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
  border: 1px solid rgba(18, 53, 80, 0.07);
}
table.table-multi th, table.table-multi td {
  padding: 13px 16px; border-top: 1px solid rgba(203, 225, 244, 0.6);
  text-align: left; font-family: var(--mono);
}
table.table-multi tbody tr:hover { background: rgba(47, 147, 224, 0.05); }
table.table-multi thead th {
  background: var(--bg-soft);
  border-top: none;
  font-family: inherit; font-size: 0.85rem;
  color: var(--primary-dark); text-transform: uppercase; letter-spacing: 0.08em;
  font-weight: 800;
}
table.table-multi .idx { color: var(--ink-4); width: 40px; text-align: center; }
table.table-multi .score { color: #c1731f; font-weight: 800; text-align: right; }

.muted { color: var(--ink-4); }
.compound {
  position: relative;
  background: #fff;
  border: 1px solid rgba(47, 147, 224, 0.16);
  border-radius: var(--radius-lg);
  padding: 36px; box-shadow: var(--shadow-sm);
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 30px;
  align-items: start;
}
@media (max-width: 760px) { .compound { grid-template-columns: 1fr; padding: 24px; } }
.compound .eq-large-wrap {
  box-shadow: none; padding: 34px 16px; font-size: 2.8rem;
  min-height: 200px;
  justify-content: center; align-self: center;
  background: var(--bg-soft);
  border: none;
}
.compound-meta h1 { font-size: 1.7rem; margin: 8px 0 4px; letter-spacing: -0.01em; }
.compound-meta .en-name { color: var(--ink-3); margin-bottom: 12px; font-style: italic; }
.compound-meta p { margin: 4px 0; color: var(--ink-2); }
.compound-meta .name-list {
  list-style: none; padding: 0; margin: 10px 0 0;
  display: grid; gap: 6px;
}
.compound-meta .name-list li { color: var(--ink-2); }
.compound-meta .name-list em {
  font-style: normal; color: var(--ink); font-weight: 600;
}
.form-alias {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}
.form-alias-label {
  font-size: 0.84rem;
  color: var(--ink-3);
}
.form-chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary-dark);
  font-size: 0.86rem;
  line-height: 1.5;
  text-decoration: none;
  transition: border-color .18s, background .18s, color .18s;
}
.form-chip:hover {
  border-color: var(--primary);
  background: var(--primary-soft, rgba(42, 161, 220, 0.08));
}
.form-chip-main {
  border-color: var(--primary);
  background: var(--primary-soft, rgba(42, 161, 220, 0.08));
  font-weight: 600;
}

.error-box {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 40px; box-shadow: var(--shadow-sm);
  max-width: 640px; margin: 40px auto;
}
.error-box h2 { margin: 0 0 14px; font-size: 1.5rem; }
.error-box p { margin: 8px 0; color: var(--ink-2); }
.error-box code { background: var(--bg-soft); padding: 1px 6px; border-radius: 4px; font-family: var(--mono); }
.error-box .actions { margin-top: 20px; }

.advanced {
  background: #fff;
  border: 1px solid rgba(47, 147, 224, 0.16);
  border-radius: var(--radius-lg);
  padding: 36px; box-shadow: var(--shadow-sm);
}
.advanced h1 { margin: 0 0 6px; font-size: 1.8rem; letter-spacing: -0.01em; }
.advanced .muted { margin: 0 0 24px; }
.adv-form {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
@media (max-width: 640px) { .adv-form { grid-template-columns: 1fr; } }
.adv-col label {
  display: block; font-size: 0.82rem; font-weight: 700;
  color: var(--ink-4); text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.adv-rows { display: grid; gap: 8px; }
.adv-row { display: flex; gap: 6px; align-items: center; }
.adv-col > .btn { margin-top: 12px; }
.adv-input {
  flex: 1; min-width: 0;
  padding: 11px 15px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: #fff;
  font-family: var(--mono); font-size: 0.95rem;
  box-shadow: inset 0 1px 2px rgba(18, 53, 80, 0.04);
}
.adv-input:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(47, 147, 224, 0.14);
}
.adv-del {
  flex: none;
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--bg);
  cursor: pointer; color: var(--ink-3); font-size: 1rem;
  transition: all var(--transition);
}
.adv-del:not(:disabled):hover { border-color: var(--accent); color: var(--danger); background: #fff3ef; }
.adv-del:disabled { opacity: 0.4; cursor: not-allowed; }
.adv-submit { grid-column: 1 / -1; text-align: center; margin-top: 8px; }
.adv-result-wrap { margin-top: 32px; }

.autocomplete-list {
  position: absolute; z-index: 100;
  list-style: none; padding: 6px; margin: 2px 0 0;
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  max-height: 300px; overflow-y: auto;
  font-size: 0.9rem;
}
.autocomplete-list li {
  padding: 8px 12px; border-radius: 8px;
  cursor: pointer; font-family: var(--mono);
  color: var(--ink-2); white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.autocomplete-list li.active,
.autocomplete-list li:hover {
  background: var(--bg-soft); color: var(--primary);
}

.fade-in { animation: fadeIn 0.35s ease-out both; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fade-in { animation: none; }
  .species-card, .chip, .btn-link { transition: none !important; }
}

.eq-large-wrap::-webkit-scrollbar { height: 6px; }
.eq-large-wrap::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
.eq-large-wrap::-webkit-scrollbar-track { background: transparent; }

@media (max-width: 760px) {
  .site-header .hd-inner {
    grid-template-columns: 1fr auto;
    row-gap: 10px;
  }
  .site-header .hd-search { grid-column: 1 / -1; grid-row: 2; }
  main { margin: 14px auto 40px; padding: 0 14px; }
}

@media (max-width: 640px) {
  .hero { min-height: 0; padding: 28px 0 40px; }
  .hero::before { display: none; }
  .hero h1 { margin-bottom: 14px; }
  .hero-rule { margin-bottom: 22px; }
  .hero-search { gap: 6px; margin-bottom: 10px; }
  .hero-search input[type="text"] { padding: 12px 40px 12px 16px; font-size: 0.95rem; }
  .hero-search button[type="submit"] { padding: 12px 18px; font-size: 0.9rem; }
  .hero-hint { margin-bottom: 24px; font-size: 0.8rem; }
  .hero-cols { grid-template-columns: 1fr; gap: 24px; }
  .hero-col { padding: 0; }
  .hero-col + .hero-col { border-left: none; border-top: 1px solid var(--line); padding-top: 22px; }
  .hero-col-title { text-align: center; }
  .hero-cols .chips { justify-content: center; }
  .block { padding: 18px 16px; }
  .species-card { padding: 15px 16px 16px; }
}

.cond-badges { display: inline-flex; flex-wrap: wrap; gap: 6px; margin-left: 10px; }
.meta-row .cond-badges { margin-left: 0; }
.cond-badge {
  display: inline-block; padding: 1px 9px; border-radius: 999px;
  background: rgba(47, 147, 224, 0.09);
  border: 1px solid rgba(47, 147, 224, 0.3);
  color: var(--primary-dark);
  font-family: var(--mono); font-size: 0.72rem; font-weight: 700;
  white-space: nowrap; cursor: help;
}
.table-multi .cond-badges { margin-left: 8px; }

.block-bleach { border-left-color: #2aa198; }
.block-bleach h3 { color: #21867a; }
.bleach-tag {
  display: inline-block; padding: 1px 9px; border-radius: 999px;
  background: rgba(42, 161, 152, 0.1); border: 1px solid rgba(42, 161, 152, 0.3);
  color: #21867a; font-size: 0.78rem; font-weight: 700;
}
.bleach-items { margin: 10px 0 0; padding-left: 20px; display: grid; gap: 5px; }
.bleach-items li { font-size: 0.92rem; color: var(--ink-2); }
.bleach-warn {
  margin: 12px 0 0; padding: 8px 12px; border-radius: var(--radius-sm);
  background: rgba(242, 153, 74, 0.08); border: 1px solid rgba(242, 153, 74, 0.25);
  font-size: 0.85rem; color: #b25a22;
}

.ency-card {
  background: #fff;
  border: 1px solid rgba(18, 53, 80, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  overflow: hidden;
}
.ency-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(18, 53, 80, 0.07);
  background: rgba(47, 147, 224, 0.04);
}
.ency-category {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  background: rgba(47, 147, 224, 0.12);
  color: var(--primary-dark);
  border: 1px solid rgba(47, 147, 224, 0.28);
  flex-shrink: 0;
}
.ency-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink-1);
  flex-shrink: 0;
}
.ency-subtitle {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--ink-3);
}
.ency-level {
  margin-left: auto;
  flex-shrink: 0;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  color: #21867a;
  background: rgba(42, 161, 152, 0.1);
  border: 1px solid rgba(42, 161, 152, 0.28);
}
.ency-body {
  padding: 16px 20px 18px;
  display: grid;
  gap: 12px;
}
.ency-row {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 14px;
  align-items: start;
  font-size: 0.92rem;
  line-height: 1.7;
}
.ency-label {
  font-weight: 700;
  color: var(--primary-dark);
  flex-shrink: 0;
  padding-top: 2px;
}
.ency-text {
  color: var(--ink-2);
}
.ency-tips {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 4px;
  color: var(--ink-2);
}
.ency-tips li { line-height: 1.65; }
@media (max-width: 640px) {
  .ency-header { flex-wrap: wrap; }
  .ency-level { margin-left: 0; }
  .ency-row { grid-template-columns: 1fr; gap: 2px; }
  .ency-label { padding-top: 0; }
}

.hd-entry {
  white-space: nowrap; flex: none;
  gap: 5px; padding: 6px 11px 6px 10px;
}
.hd-entry-icon { font-size: 0.92rem; line-height: 1; color: var(--ink-3); }
.hd-entry:hover .hd-entry-icon { color: var(--primary); }
.hd-entry-text { white-space: nowrap; font-size: 0.84rem; }
.hd-badge {
  flex: none;
  min-width: 17px; height: 17px; padding: 0 4px;
  border-radius: 999px;
  background: rgba(47, 147, 224, 0.14); color: var(--primary-dark);
  font-size: 0.66rem; line-height: 17px; font-weight: 700;
  text-align: center; letter-spacing: 0;
}
.hd-badge[hidden] { display: none; }
@media (max-width: 640px) {
  .hd-entry-text { display: none; }
}

/* ----- 收藏与历史页 ----- */
.saved-page {
  max-width: 1040px; margin: 0 auto; padding: 10px 0 48px;
}
.saved-head { text-align: center; margin-bottom: 24px; }
.saved-head h1 { margin: 0 0 8px; font-size: 1.55rem; color: var(--ink-2); }
.saved-sub { margin: 0; color: var(--ink-4); font-size: 0.88rem; }
.saved-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; flex-wrap: wrap; margin-bottom: 16px;
}
.saved-tabs { display: flex; gap: 10px; }
.saved-tab {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; border: 1px solid var(--line);
  color: var(--ink-3); font-size: 0.88rem;
  padding: 8px 18px; border-radius: 999px; text-decoration: none;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.saved-tab:hover { color: var(--primary-dark); border-color: var(--primary); text-decoration: none; }
.saved-tab.is-active { background: var(--primary); border-color: var(--primary); color: #fff; }
.saved-search { flex: 0 1 320px; min-width: 220px; }
.saved-search .search-field {
  display: flex; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 0 10px;
}
.saved-search .search-field:focus-within { border-color: var(--primary); }
.saved-search input {
  flex: 1 1 auto; min-width: 0;
  border: none; outline: none; background: transparent;
  padding: 9px 4px; font-size: 0.88rem; color: var(--ink-2);
}
.saved-search .search-clear {
  background: transparent; border: none; cursor: pointer;
  color: var(--ink-4); font-size: 0.75rem;
  width: 22px; height: 22px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
}
.saved-search .search-clear:hover { background: var(--line); color: var(--ink-2); }
.saved-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.saved-count { color: var(--ink-4); font-size: 0.8rem; letter-spacing: 0.02em; }
.saved-clear {
  background: transparent; border: none; cursor: pointer;
  color: var(--ink-4); font-size: 0.8rem; padding: 4px 10px; border-radius: 999px;
  transition: color var(--transition), background var(--transition);
}
.saved-clear:hover { color: var(--danger); background: rgba(214, 69, 69, 0.08); }
.saved-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px;
}
.saved-card {
  display: flex; align-items: center; gap: 8px; min-width: 0;
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 12px 11px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.saved-card:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(47, 147, 224, 0.12); }
.saved-link {
  flex: 1 1 auto; min-width: 0;
  color: var(--ink-2); text-decoration: none; font-size: 0.9rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.saved-link:hover { color: var(--primary-dark); text-decoration: none; }
.saved-del {
  flex: none; background: transparent; border: none; cursor: pointer;
  color: var(--ink-4); font-size: 0.72rem; line-height: 1;
  width: 24px; height: 24px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  opacity: 0.5; transition: opacity var(--transition), color var(--transition), background var(--transition);
}
.saved-del:hover { opacity: 1; color: var(--danger); background: rgba(214, 69, 69, 0.1); }
.saved-empty {
  margin: 0; padding: 48px 12px; text-align: center;
  color: var(--ink-4); font-size: 0.9rem;
}
@media (max-width: 720px) {
  .saved-grid { grid-template-columns: 1fr; }
  .saved-search { flex: 1 1 100%; }
}

.app-version {
  position: fixed;
  right: 16px;
  bottom: 14px;
  z-index: 40;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink-4);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  line-height: 1.5;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  user-select: none;
  pointer-events: none;
  transition: color var(--transition), border-color var(--transition);
}
@media (max-width: 720px) {
  .app-version { right: 10px; bottom: 10px; font-size: 0.66rem; padding: 3px 8px; }
}

.btn-fav {
  background: transparent; color: var(--ink-3); border-color: var(--line);
  cursor: pointer;
}
.btn-fav:hover { color: var(--primary-dark); border-color: var(--primary); background: rgba(47, 147, 224, 0.06); }
.btn-fav.is-fav {
  color: var(--primary-dark); border-color: var(--primary);
  background: rgba(47, 147, 224, 0.1);
}