:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --line: #e6e8ef;
  --text: #1f2430;
  --muted: #8a90a2;
  --brand: #1e88ff;
  --brand-soft: #e8f2ff;
  --teal: #12b8a6;
  --teal-soft: #e2f7f4;
  --q1: #1faa6b;
  --q2: #3a8fd4;
  --q3: #e0a73a;
  --q4: #d4685a;
  --qna: #9aa0b0;
  --ccf-a: #6d28d9;
  --ccf-b: #1e88ff;
  --ccf-c: #8a90a2;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

.app {
  max-width: 580px;
  margin: 0 auto;
  padding: 16px 18px 18px;
}

/* ---------------- 顶部栏 ---------------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
}

.topbar__back {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  padding: 5px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}
.topbar__back:hover { border-color: var(--brand); color: var(--brand); }

.topbar__title {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 18px;
  font-weight: 700;
}

.topbar__logo {
  width: 26px;
  height: 26px;
  border-radius: 7px;
}

/* ---------------- 首页 ---------------- */
.home__intro {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin: 14px 2px 12px;
}
.home__sub {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
}
.home__intro .project-star { margin-left: auto; }
.project-star {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-size: 12.5px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
}
.project-star:hover { border-color: var(--brand); color: var(--brand); }
.project-star:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.tool {
  position: relative;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 14px;
  padding: 16px 14px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.tool:hover:not(:disabled) {
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(30,136,255,0.10);
}
.tool--soon { opacity: 0.6; cursor: not-allowed; }

.tool__icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 6px;
}
.tool__icon--blue { background: var(--brand-soft); }
.tool__icon--teal { background: var(--teal-soft); }
.tool__icon--gray { background: #eef0f4; }

.tool__name { font-size: 15px; font-weight: 600; }
.tool__desc { font-size: 12px; color: var(--muted); }

.tool__badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 10.5px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef0f4;
  color: var(--muted);
}
.tool__badge--on { background: rgba(31,170,107,0.14); color: var(--q1); }
.tool__badge--beta { background: var(--teal-soft); color: var(--teal); }

/* ---------------- 输入 ---------------- */
.io__input {
  width: 100%;
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  outline: none;
}
.io__input:focus { border-color: var(--brand); }

.io__hint {
  min-height: 16px;
  margin: 8px 2px 0;
  color: var(--muted);
  font-size: 12px;
}
.io__hint b { color: var(--brand); }

/* ---------------- 期刊结果 ---------------- */
.results {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.empty {
  padding: 24px;
  text-align: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 12px;
  background: var(--card);
}

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  padding: 12px 14px;
}

/* 期刊卡片：左侧名称区 + 右侧指标区（space-between 对齐） */
.card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.card__name {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  word-break: break-word;
  min-width: 0;                     /* 允许文字收缩 */
}

/* 左侧名称区：占据剩余空间 */
.card__info { flex: 1; min-width: 0; }

.card__sub {
  margin-top: 3px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.3;
}

/* IF 区块：右侧独立成块，视觉突出 */
.card__if-block {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex-shrink: 0;                  /* 不被压缩 */
  margin-left: auto;               /* 始终靠右 */
}

.badge-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  flex-wrap: wrap;
}

.badge {
  flex: 0 0 auto;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}
/* IF 徽标：加大加粗，视觉焦点 */
.badge--if {
  background: var(--brand);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  padding: 5px 11px;
  letter-spacing: -0.2px;
}
.badge--q1 { background: rgba(31,170,107,0.12); color: var(--q1); }
.badge--q2 { background: rgba(58,143,212,0.12); color: var(--q2); }
.badge--q3 { background: rgba(224,167,58,0.14); color: var(--q3); }
.badge--q4 { background: rgba(212,104,90,0.14); color: var(--q4); }
.badge--qna { background: #eef0f4; color: var(--qna); }

/* CCF 等级徽标：用紫/蓝/灰三档，与 Q 分区在色系上区分开 */
.badge--ccf-a { background: rgba(109,40,217,0.12); color: var(--ccf-a); }
.badge--ccf-b { background: rgba(30,136,255,0.12); color: var(--ccf-b); }
.badge--ccf-c { background: #eef0f4; color: var(--ccf-c); }
/* CCF 领域 / 变动备注：弱化，避免抢焦点 */
.badge--cat {
  background: var(--teal-soft);
  color: var(--teal);
  font-weight: 500;
}
.badge--note {
  background: rgba(224,167,58,0.16);
  color: #a6791b;
  font-weight: 500;
}

.card__meta {
  margin-top: 6px;
  font-size: 12.5px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.card__meta--sub { color: var(--muted); }
.dot { color: var(--muted); }

.card__stats {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}
.stat {
  background: #fafbfd;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 4px;
  text-align: center;
}
.stat__num {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}
/* 第一个统计格（总被引）用品牌色突出 */
.card__stats .stat:first-child .stat__num {
  font-size: 15px;
  font-weight: 700;
  color: var(--brand);
}
.stat__label {
  display: block;
  margin-top: 2px;
  font-size: 10.5px;
  color: var(--muted);
}

.card__ccf {
  margin-top: 6px;
  font-size: 11.5px;
  color: var(--teal);
  line-height: 1.5;
  word-break: break-word;
}

.card__cat {
  margin-top: 8px;
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.5;
  word-break: break-word;
}

/* ---------------- 类型筛选条 ---------------- */
.chips {
  margin-top: 10px;
  display: flex;
  gap: 8px;
}

.chip {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font-size: 12.5px;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}

.chip:hover { border-color: #cfd6e4; }

.chip.is-on {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.card__actions { margin-top: 10px; display: flex; gap: 8px; }

.btn {
  border: none;
  background: var(--brand);
  color: #fff;
  padding: 8px 16px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 12.5px;
}
.btn:hover { filter: brightness(1.05); }
.btn--ghost { background: var(--card); color: var(--text); border: 1px solid var(--line); }
.btn--sm { padding: 7px 14px; }

/* ---------------- 数据库网格 ---------------- */
.db-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.db {
  text-align: left;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.db:hover { border-color: var(--teal); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(18,184,166,0.1); }
.db__name { font-size: 14px; font-weight: 600; }
.db__desc { margin-top: 3px; font-size: 11.5px; color: var(--muted); line-height: 1.4; }

/* ---------------- 页脚 ---------------- */
.app__footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}
code {
  background: var(--brand-soft);
  color: var(--brand);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 12px;
}

/* ---------------- 科研换算 ---------------- */
.conv-tabs {
  display: flex;
  gap: 0;
  margin-top: 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-bottom: 2px solid var(--line);
}
.conv-tab {
  flex: 0 0 auto;
  padding: 8px 14px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  transition: all 0.15s ease;
}
.conv-tab:hover { color: var(--text); }
.conv-tab--active {
  color: var(--brand);
  border-bottom-color: var(--brand);
  font-weight: 600;
}

.conv-body { margin-top: 14px; }

.conv-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.conv-row select, .conv-row input[type="number"] {
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  font-size: 14px;
  outline: none;
  min-width: 0;
}
.conv-row select:focus, .conv-row input:focus { border-color: var(--brand); }
.conv-row input[type="number"] {
  flex: 1;
  min-width: 100px;
  font-weight: 600;
  font-size: 15px;
}
.conv-row select { min-width: 90px; cursor: pointer; }

.conv-arrow {
  font-size: 18px;
  color: var(--muted);
  user-select: none;
  flex-shrink: 0;
}

.conv-result {
  margin-top: 14px;
  padding: 14px 16px;
  background: linear-gradient(135deg, #f0f5ff, #eef7fb);
  border: 1px solid #d4e3ff;
  border-radius: 12px;
  font-size: 15px;
  line-height: 1.7;
  word-break: break-all;
}
.conv-result strong { color: var(--brand); }
.conv-result .conv-detail {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed #d4e3ff;
  font-size: 13px;
  color: var(--muted);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 4px 16px;
}
.conv-result .conv-detail span { white-space: nowrap; }

/* 摩尔计算器 */
.mol-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  align-items: end;
}
.mol-form label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
}
.mol-form input {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  font-size: 14px;
  outline: none;
}
.mol-form input:focus { border-color: var(--brand); }
.mol-form .mol-full { grid-column: 1 / -1; }

.app-release-notes summary{cursor:pointer;font-weight:600;color:#3d6674}.app-release-notes ul{padding-left:20px;color:#63798a;font-size:13px;line-height:1.9}.app-release-notes li+li{margin-top:7px}