/* ============ PaperRadar 设计系统 ============ */
:root {
  --primary: #2563eb;
  --primary-strong: #1d4ed8;
  --accent: #7c3aed;
  --grad: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --bg: #f4f6fb;
  --surface: #ffffff;
  --sidebar-bg: #101828;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: #e2e8f0;
  --ok: #059669;
  --ok-bg: #ecfdf5;
  --warn: #d97706;
  --warn-bg: #fffbeb;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --arxiv: #b91c1c;
  --arxiv-bg: #fef2f2;
  --oa-blue: #1d4ed8;
  --oa-blue-bg: #eff6ff;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 18px 40px -18px rgba(37, 99, 235, 0.35);
  --sidebar-w: 248px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; }
input, select { font-family: inherit; }

/* ============ 侧边导航栏 ============ */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 14px;
  transition: width 0.25s ease, min-width 0.25s ease;
}

.brand { display: flex; align-items: center; gap: 10px; padding: 6px 10px 24px; }
.brand-logo {
  width: 40px; height: 40px; border-radius: 12px;
  background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
  box-shadow: 0 6px 16px -6px rgba(124, 58, 237, 0.7);
}
.brand-name { font-weight: 700; font-size: 16px; color: #f8fafc; letter-spacing: 0.2px; }
.brand-sub { font-size: 12px; color: #64748b; }

.nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px; border-radius: 10px;
  color: #94a3b8; text-decoration: none; cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
  user-select: none;
}
.nav-item:hover { background: rgba(255, 255, 255, 0.06); color: #e2e8f0; }
.nav-item.active { background: rgba(37, 99, 235, 0.18); color: #fff; }
.nav-icon { font-size: 17px; }
.nav-label { font-size: 14px; font-weight: 500; }

.sidebar-foot { padding: 10px 6px 4px; display: flex; flex-direction: column; gap: 10px; }
.llm-status { display: flex; align-items: center; gap: 8px; font-size: 12px; color: #94a3b8; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #64748b; flex-shrink: 0; }
.dot.on { background: #10b981; box-shadow: 0 0 8px rgba(16, 185, 129, 0.8); }
.dot.off { background: #f59e0b; }
.sources { display: flex; gap: 6px; }
.src-tag { font-size: 11px; padding: 2px 8px; border-radius: 6px; font-weight: 600; }
.src-oa { background: rgba(37, 99, 235, 0.15); color: #93c5fd; }
.src-arxiv { background: rgba(185, 28, 28, 0.18); color: #fca5a5; }

/* ============ 主区 ============ */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  padding: 22px 32px 18px;
  background: rgba(244, 246, 251, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}
.view-title { font-size: 22px; font-weight: 700; letter-spacing: 0.2px; }
.view-sub { font-size: 13px; color: var(--text-3); margin-top: 3px; }

.content { padding: 24px 32px 48px; max-width: 1240px; width: 100%; margin: 0 auto; }

/* ============ 通用面板 / 卡片 ============ */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ============ 输入区 ============ */
.search-panel { padding: 22px 24px; margin-bottom: 18px; }
.search-row { display: flex; gap: 12px; }
.search-box {
  flex: 1; display: flex; align-items: center; gap: 10px;
  border: 2px solid var(--border); border-radius: 12px;
  padding: 0 16px; background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.search-box:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12); }
.search-icon { font-size: 16px; opacity: 0.55; }
.search-box input {
  flex: 1; border: none; outline: none; height: 52px;
  font-size: 15px; color: var(--text); background: transparent;
}
.search-box input::placeholder { color: var(--text-3); }

.btn {
  border: none; border-radius: 12px; cursor: pointer;
  font-size: 15px; font-weight: 600; padding: 0 26px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  user-select: none;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: var(--grad); color: #fff; height: 56px;
  box-shadow: 0 10px 22px -10px rgba(37, 99, 235, 0.6);
}
.btn-primary:hover { box-shadow: 0 14px 28px -10px rgba(37, 99, 235, 0.75); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-ghost {
  background: transparent; border: 1px solid var(--border); color: var(--text-2);
  padding: 0 14px; font-size: 13px; height: 36px; border-radius: 10px;
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13px; border-radius: 9px; }
.btn-outline {
  background: #fff; border: 1px solid var(--border); color: var(--text-2);
  transition: all 0.18s ease;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--oa-blue-bg); }

.param-row { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 16px; align-items: center; }
.param { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-2); cursor: pointer; }
.param input[type="checkbox"] { width: 15px; height: 15px; accent-color: var(--primary); cursor: pointer; }
.param-select { gap: 6px; }
.param select {
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px;
  font-size: 13px; color: var(--text-2); background: #fff; outline: none;
}
.param select:focus { border-color: var(--primary); }
.param-input input {
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px;
  font-size: 13px; color: var(--text-2); outline: none; width: 130px;
}
.param-input input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

/* ============ 任务进度区 ============ */
.progress-panel { padding: 22px 26px; margin-bottom: 18px; }
.steps { display: flex; align-items: center; gap: 0; }
.step { display: flex; align-items: center; gap: 9px; flex: 1; position: relative; }
.step:not(:last-child)::after {
  content: ""; position: absolute; left: calc(100% - 8px); right: 0;
  height: 2px; background: var(--border); border-radius: 2px;
}
.step-dot {
  width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid var(--border); background: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; color: transparent; flex-shrink: 0;
  transition: all 0.3s ease;
}
.step-label { font-size: 13px; color: var(--text-3); white-space: nowrap; }
.step.done .step-dot { background: var(--ok); border-color: var(--ok); color: #fff; }
.step.done .step-label { color: var(--text-2); }
.step.done:not(:last-child)::after { background: var(--ok); }
.step.active .step-dot { border-color: var(--primary); animation: pulse 1.2s ease-in-out infinite; }
.step.active .step-label { color: var(--primary); font-weight: 600; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.35); }
  50% { box-shadow: 0 0 0 7px rgba(37, 99, 235, 0); }
}
.progress-note { margin-top: 14px; font-size: 13px; color: var(--text-3); }
.progress-note::before {
  content: ""; display: inline-block; width: 12px; height: 12px;
  border: 2px solid var(--primary); border-top-color: transparent;
  border-radius: 50%; margin-right: 8px; vertical-align: -2px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============ 结果区 ============ */
.results-panel { padding: 20px 24px; margin-bottom: 18px; }
.results-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; padding-bottom: 16px;
  border-bottom: 1px solid var(--border); margin-bottom: 6px;
}
.results-meta { font-size: 14px; color: var(--text-2); }
.results-meta strong { color: var(--primary); font-size: 16px; }
.results-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.source-errors {
  background: var(--warn-bg); border: 1px solid #fde68a; color: var(--warn);
  border-radius: 10px; padding: 10px 14px; font-size: 13px; margin: 10px 0 4px;
}

.paper-list { display: flex; flex-direction: column; gap: 14px; padding: 14px 0 6px; }

.paper-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 13px;
  padding: 18px 20px;
  transition: transform 0.18s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}
.paper-card:hover {
  transform: translateY(-2px);
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: var(--shadow-lg);
}
.paper-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.paper-title {
  font-size: 15.5px; font-weight: 600; color: var(--text); line-height: 1.45;
  text-decoration: none; display: block;
}
.paper-title:hover { color: var(--primary); }
.paper-badges { display: flex; gap: 6px; flex-wrap: wrap; flex-shrink: 0; margin-top: 2px; }

.badge {
  font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 20px;
  white-space: nowrap;
}
.badge-oa { background: var(--ok-bg); color: var(--ok); }
.badge-closed { background: #f1f5f9; color: var(--text-3); }
.badge-cited { background: var(--warn-bg); color: var(--warn); }
.badge-openalex { background: var(--oa-blue-bg); color: var(--oa-blue); }
.badge-arxiv { background: var(--arxiv-bg); color: var(--arxiv); }
.badge-year { background: #f1f5f9; color: var(--text-2); font-weight: 600; }

.paper-meta { margin-top: 6px; font-size: 12.5px; color: var(--text-3); display: flex; flex-wrap: wrap; gap: 4px 14px; }
.paper-meta b { color: var(--text-2); font-weight: 600; }
.paper-abstract {
  margin-top: 10px; font-size: 13.5px; color: var(--text-2); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.paper-abstract.open { -webkit-line-clamp: unset; display: block; }
.paper-abstract-toggle { margin-left: 6px; font-size: 12px; color: var(--primary); cursor: pointer; user-select: none; }

.paper-actions { margin-top: 13px; display: flex; gap: 8px; flex-wrap: wrap; }
.link-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 500; padding: 7px 14px; border-radius: 9px;
  text-decoration: none; border: 1px solid var(--border); color: var(--text-2);
  background: #fff; transition: all 0.18s ease; cursor: pointer;
}
.link-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--oa-blue-bg); }
.link-btn.pdf { color: var(--arxiv); }
.link-btn.pdf:hover { border-color: var(--arxiv); background: var(--arxiv-bg); color: var(--arxiv); }
.link-btn.ai {
  border: none; color: #fff; background: var(--grad);
  box-shadow: 0 6px 14px -6px rgba(37, 99, 235, 0.55);
}
.link-btn.ai:hover { transform: translateY(-1px); box-shadow: 0 10px 20px -6px rgba(37, 99, 235, 0.65); }
.link-btn.ai.loading { opacity: 0.75; pointer-events: none; }

.summary-inline {
  margin-top: 14px; padding: 16px 18px; border-radius: 11px;
  background: #f8fafc; border: 1px solid var(--border);
}

/* ============ 空状态 ============ */
.empty-state { text-align: center; padding: 64px 20px 48px; color: var(--text-3); }
.empty-illust { font-size: 52px; margin-bottom: 14px; opacity: 0.85; }
.empty-state h3 { color: var(--text-2); font-size: 16px; margin-bottom: 6px; }
.empty-state p { font-size: 13px; }

/* ============ 骨架屏 ============ */
.skeleton-card {
  border: 1px solid var(--border); border-radius: 13px; padding: 18px 20px;
  background: var(--surface);
}
.sk-line {
  height: 12px; border-radius: 6px; background: #eef2f7;
  background: linear-gradient(90deg, #eef2f7 25%, #e2e8f0 50%, #eef2f7 75%);
  background-size: 200% 100%;
  animation: shimmer 1.3s infinite;
  margin-bottom: 10px;
}
.sk-line.w60 { width: 60%; }
.sk-line.w40 { width: 40%; }
.sk-line.w85 { width: 85%; }
.sk-line.w25 { width: 25%; }
@keyframes shimmer { to { background-position: -200% 0; } }

/* ============ 学科雷达 ============ */
.subject-intro { padding: 16px 20px; font-size: 13.5px; color: var(--text-2); margin-bottom: 16px; }
.featured-tip { color: var(--primary); font-weight: 600; }
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 14px; }

.subject-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 13px;
  padding: 16px; cursor: pointer; position: relative;
  transition: transform 0.18s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.subject-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: rgba(37, 99, 235, 0.45); }
.subject-card.featured { border-top: 3px solid var(--primary); }
.subject-card.selected { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15); }
.subject-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.subject-avatar {
  width: 34px; height: 34px; border-radius: 10px; color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; flex-shrink: 0;
}
.subject-name { font-size: 14.5px; font-weight: 700; }
.subject-en { font-size: 11.5px; color: var(--text-3); margin-top: 1px; }
.subject-desc { font-size: 12.5px; color: var(--text-2); line-height: 1.55; }
.subject-hot { margin-top: 9px; font-size: 12px; color: var(--text-2); }
.subject-hot b { color: var(--primary); }
.star { position: absolute; top: 12px; right: 12px; font-size: 14px; }

/* 学科详情面板 */
.subject-detail {
  background: var(--surface); border: 1px solid rgba(37, 99, 235, 0.4); border-radius: 14px;
  padding: 20px 22px; margin-bottom: 16px; box-shadow: var(--shadow);
  animation: slideDown 0.25s ease;
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
.detail-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.detail-title { font-size: 17px; font-weight: 700; display: flex; align-items: center; gap: 9px; }
.detail-en { font-size: 12px; color: var(--text-3); font-weight: 500; }
.detail-desc { margin-top: 7px; font-size: 13.5px; color: var(--text-2); }
.detail-block { margin-top: 14px; }
.detail-block-title { font-size: 12.5px; font-weight: 700; color: var(--text-3); letter-spacing: 0.5px; margin-bottom: 8px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-size: 12px; padding: 4px 11px; border-radius: 16px;
  background: #f1f5f9; color: var(--text-2); border: 1px solid var(--border);
}
.chip.issn { font-family: ui-monospace, Consolas, monospace; background: var(--oa-blue-bg); color: var(--oa-blue); border-color: #dbeafe; }
.detail-actions { margin-top: 16px; display: flex; gap: 10px; flex-wrap: wrap; }
.detail-summary { margin-top: 14px; }

/* ============ AI 综述抽屉 ============ */
.drawer-mask {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.45);
  z-index: 40; opacity: 0; transition: opacity 0.25s ease;
}
.drawer-mask.show { opacity: 1; }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(600px, 94vw);
  background: var(--surface); z-index: 50; box-shadow: -24px 0 60px -30px rgba(15, 23, 42, 0.5);
  transform: translateX(105%); transition: transform 0.3s cubic-bezier(0.22, 0.9, 0.3, 1);
  display: flex; flex-direction: column;
}
.drawer.show { transform: none; }
.drawer-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 20px 24px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #f8fafc, #fff);
}
.drawer-title { font-size: 16px; font-weight: 700; }
.drawer-sub { font-size: 12px; color: var(--text-3); margin-top: 3px; max-width: 460px; }
.drawer-close {
  border: none; background: #f1f5f9; color: var(--text-2); width: 32px; height: 32px;
  border-radius: 9px; cursor: pointer; font-size: 13px; flex-shrink: 0;
  transition: all 0.15s ease;
}
.drawer-close:hover { background: var(--danger-bg); color: var(--danger); }
.drawer-body { flex: 1; overflow-y: auto; padding: 22px 26px 40px; }

/* 综述 markdown 排版 */
.md { font-size: 14px; color: var(--text); line-height: 1.75; }
.md h1, .md h2 { font-size: 16px; margin: 18px 0 8px; padding-left: 10px; border-left: 3px solid var(--primary); }
.md h3 { font-size: 14.5px; margin: 14px 0 6px; color: var(--text-2); }
.md p { margin: 8px 0; }
.md ul, .md ol { margin: 8px 0 8px 20px; }
.md li { margin: 4px 0; }
.md strong { color: var(--text); }
.md code {
  font-family: ui-monospace, Consolas, monospace; font-size: 12.5px;
  background: #f1f5f9; padding: 1px 6px; border-radius: 5px; color: var(--accent);
}
.md blockquote { border-left: 3px solid var(--border); padding-left: 12px; color: var(--text-3); margin: 8px 0; }
.md hr { border: none; border-top: 1px solid var(--border); margin: 14px 0; }

.drawer-loading { padding: 30px 0; text-align: center; color: var(--text-3); font-size: 13px; }
.drawer-error { background: var(--danger-bg); color: var(--danger); border: 1px solid #fecaca; border-radius: 10px; padding: 12px 14px; font-size: 13px; }

/* ============ Toast ============ */
.toast {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%) translateY(-16px);
  background: #0f172a; color: #f8fafc; font-size: 13.5px;
  padding: 11px 20px; border-radius: 11px; z-index: 60;
  box-shadow: 0 14px 34px -12px rgba(15, 23, 42, 0.55);
  opacity: 0; transition: all 0.3s ease; max-width: 80vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.err { background: var(--danger); }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .param-row { gap: 8px 14px; }
}

@media (max-width: 860px) {
  .sidebar { width: 76px; min-width: 76px; padding: 18px 10px; }
  .brand { justify-content: center; padding: 4px 0 22px; }
  .brand-text, .nav-label, .llm-text, .src-tag { display: none; }
  .nav-item { justify-content: center; padding: 12px 0; }
  .nav-icon { font-size: 20px; }
  .sidebar-foot { align-items: center; }
  .content { padding: 18px 16px 40px; }
  .topbar { padding: 16px 20px 14px; }
  .search-row { flex-direction: column; }
  .btn-primary { width: 100%; }
}

@media (max-width: 640px) {
  body { flex-direction: column; }
  .sidebar {
    width: 100%; min-width: 100%; height: auto; position: sticky; top: 0; z-index: 30;
    flex-direction: row; align-items: center; padding: 8px 12px; gap: 8px;
  }
  .brand { padding: 0; }
  .brand-logo { width: 34px; height: 34px; font-size: 16px; }
  .brand-text { display: block; }
  .brand-sub { display: none; }
  .nav { flex-direction: row; flex: 1; justify-content: flex-end; gap: 4px; }
  .nav-item { padding: 8px 10px; }
  .nav-label { display: inline; font-size: 13px; }
  .sidebar-foot { display: none; }
  .view-title { font-size: 18px; }
  .step-label { font-size: 11px; }
  .paper-head { flex-direction: column; }
  .paper-badges { margin-top: 6px; }
}