/* ===== 通用（绿色主题） ===== */
:root {
  --green: #2e7d32;
  --green-50: #e8f5e9;
  --green-100: #c8e6c9;
  --green-600: #2e7d32;
  --green-700: #1b5e20;
  --ink: #1f2d23;
  --muted: #5f7361;
  --line: #d7e3d8;
  --bg: #f6faf6;
  --card: #ffffff;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--green-600); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 布局 ===== */
.container { max-width: 960px; margin: 0 auto; padding: 24px 20px 64px; }

header.app-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  padding: 18px 0; border-bottom: 1px solid var(--line); margin-bottom: 20px;
}
header.app-header h1 { font-size: 20px; margin: 0; color: var(--green-700); }
header.app-header .actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

select, button, input {
  font: inherit; border-radius: 8px; border: 1px solid var(--line);
  padding: 8px 12px; background: #fff; color: var(--ink);
}
button {
  cursor: pointer; background: var(--green-600); color: #fff; border: none;
  transition: background 0.15s;
}
button:hover { background: var(--green-700); }
button.ghost { background: #fff; color: var(--green-700); border: 1px solid var(--green-100); }
button.ghost:hover { background: var(--green-50); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

/* ===== 卡片 ===== */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 18px 20px; margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card .title-row { display: flex; align-items: flex-start; gap: 10px; }
.card h3 { margin: 0 0 6px; font-size: 17px; line-height: 1.4; }
.badge {
  display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px;
  background: var(--green-50); color: var(--green-700); border: 1px solid var(--green-100);
}
.title-zh { color: #33433a; font-size: 14px; margin-top: 4px; font-weight: 500; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tag {
  display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 4px;
  background: #eef4f0; color: #2f5d3a; border: 1px solid #d4e6da;
}
.tagbar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tagfilter {
  font-size: 12px; padding: 3px 10px; border-radius: 999px; cursor: pointer;
  background: #fff; color: #2f5d3a; border: 1px solid var(--line);
}
.tagfilter:hover { background: var(--green-50); border-color: var(--green-100); }
.tagfilter.active { background: var(--green-600); color: #fff; border-color: var(--green-600); }
.muted { color: var(--muted); font-size: 13px; }
.date { color: var(--muted); font-size: 12px; }

/* ===== 论文卡（同 .question-block 风格） ===== */
.paper .authors { color: var(--muted); font-size: 13px; margin: 4px 0 10px; }
.paper .abstract-toggle { cursor: pointer; user-select: none; color: var(--green-600); font-size: 13px; }
.paper .abstract { display: none; margin-top: 8px; color: #33433a; font-size: 14px; background: var(--green-50); padding: 10px 12px; border-radius: 8px; }
.paper .abstract.open { display: block; }

.paper .summary { display: none; margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 12px; }
.paper .summary.open { display: block; }
.paper .summary h4 { margin: 0 0 4px; font-size: 14px; color: var(--green-700); }
.paper .summary p { margin: 0 0 10px; font-size: 14px; }
.paper .summary .seg { margin-bottom: 10px; }
.paper .summary .regen-row { margin-top: 6px; text-align: right; }
.paper .summary .regen-btn {
  font-size: 12px; padding: 4px 10px; background: #fff;
  color: var(--muted); border: 1px solid var(--line);
}
.paper .summary .regen-btn:hover { background: var(--green-50); color: var(--green-700); border-color: var(--green-100); }
.paper .summary .regen-btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ===== toast ===== */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: rgba(27, 94, 32, 0.96); color: #fff; padding: 10px 18px;
  border-radius: 999px; font-size: 14px; box-shadow: 0 6px 20px rgba(0,0,0,0.18);
  opacity: 0; pointer-events: none; transition: opacity 0.2s, bottom 0.2s; z-index: 9999;
}
.toast.show { opacity: 1; bottom: 36px; }

/* ===== spinner ===== */
.spinner {
  display: inline-block; width: 14px; height: 14px; border: 2px solid #fff3;
  border-top-color: #fff; border-radius: 50%; animation: spin 0.8s linear infinite; vertical-align: -2px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* ===== pagination ===== */
.pagination {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 6px; margin: 24px 0 8px; font-size: 14px;
}
.pagination button {
  padding: 6px 12px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--card); color: var(--ink); cursor: pointer; transition: all 0.15s;
}
.pagination button:hover:not(:disabled) { border-color: var(--green); color: var(--green); }
.pagination button:disabled { opacity: 0.4; cursor: default; }
.pagination button.active { background: var(--green); border-color: var(--green); color: #fff; }
.pagination span { color: var(--muted); padding: 0 4px; }
.pagination .page-info { font-size: 13px; margin-left: 6px; }