:root {
  --primary: #4F46E5;
  --primary-2: #6366F1;
  --primary-3: #8B5CF6;
  --bg: #F8FAFC;
  --bg-deep: #0F172A;
  --text: #0F172A;
  --text-soft: #475569;
  --text-inv: #F1F5F9;
  --card-border: rgba(99, 102, 241, 0.18);
  --glass: rgba(255, 255, 255, 0.62);
  --shadow: 0 10px 30px -12px rgba(79, 70, 229, 0.35);
  --radius: 18px;
  --maxw: 820px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100%;
}

body {
  position: relative;
  overflow-x: hidden;
}

/* 渐变极光背景 */
.aurora {
  position: fixed;
  inset: -20% -20% auto -20%;
  height: 70vh;
  background:
    radial-gradient(40% 50% at 20% 20%, rgba(139, 92, 246, 0.35), transparent 70%),
    radial-gradient(45% 55% at 80% 10%, rgba(79, 70, 229, 0.30), transparent 70%),
    radial-gradient(35% 45% at 55% 40%, rgba(99, 102, 241, 0.25), transparent 70%);
  filter: blur(20px);
  z-index: -1;
  animation: drift 18s ease-in-out infinite alternate;
}
@keyframes drift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to { transform: translate3d(3%, 2%, 0) scale(1.08); }
}

/* 导航 */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(180%) blur(14px);
  background: linear-gradient(180deg, rgba(255,255,255,0.75), rgba(255,255,255,0.45));
  border-bottom: 1px solid rgba(99,102,241,0.12);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 12px;
  font-weight: 700; font-size: 20px; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-3));
  box-shadow: var(--shadow);
}
.brand-text h1 { font-size: 18px; margin: 0; font-weight: 700; letter-spacing: .3px; }
.brand-text p { margin: 2px 0 0; font-size: 12.5px; color: var(--text-soft); }
.github-link {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; font-weight: 600; color: var(--text-soft);
  text-decoration: none;
  padding: 8px 12px; border-radius: 999px;
  border: 1px solid rgba(99,102,241,0.2);
  background: rgba(255,255,255,0.5);
  transition: .2s;
  cursor: pointer;
}
.github-link:hover { color: var(--primary); border-color: var(--primary-2); transform: translateY(-1px); }
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
/* 导航栏内的精度切换：标签省略，紧凑并排 */
.nav-actions .precision-toggle {
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
}
.nav-actions .precision-opt {
  font-size: 13px;
  padding: 6px 14px;
}

/* Hero 搜索 */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 20px 24px;
  text-align: center;
}
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute; left: 18px;
  color: var(--primary-2);
  pointer-events: none;
}
#search {
  width: 100%;
  font-size: 17px;
  font-family: inherit;
  color: var(--text);
  padding: 18px 20px 18px 20px;
  border-radius: 999px;
  border: 1px solid rgba(99,102,241,0.25);
  background: var(--glass);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  outline: none;
  transition: .25s;
}
#search::placeholder { color: #94a3b8; }
#search:focus {
  border-color: var(--primary-2);
  box-shadow: 0 0 0 6px rgba(99,102,241,0.18), var(--shadow);
  transform: scale(1.012);
}
.precision-toggle {
  display: inline-flex;
  padding: 4px;
  border-radius: 999px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  gap: 4px;
}
.precision-opt {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 7px 18px;
  cursor: pointer;
  outline: none;
  transition: .2s;
}
.precision-opt:hover { color: var(--primary-2); }
.precision-opt.is-active {
  background: var(--primary-2);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.4);
}

.stats {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-soft);
}
.progress {
  width: 100%;
  max-width: var(--maxw);
  height: 8px;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.15);
  overflow: hidden;
  margin: 0 auto 8px;
}
.progress-bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--primary-3));
  transition: width .15s ease;
}
.progress-text {
  text-align: center;
}
.progress-detail {
  color: #94a3b8;
}

/* 栏目胶囊 */
.chips {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center;
  margin-top: 16px;
}
.chip {
  font-size: 13px; font-weight: 600;
  padding: 7px 14px; border-radius: 999px;
  border: 1px solid rgba(99,102,241,0.22);
  background: rgba(255,255,255,0.55);
  color: var(--text-soft);
  cursor: pointer;
  transition: .18s;
  user-select: none;
}
.chip:hover { color: var(--primary); transform: translateY(-1px); }
.chip.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-3));
  border-color: transparent;
  box-shadow: var(--shadow);
}

/* 结果 */
.results {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--glass);
  backdrop-filter: blur(12px);
  padding: 18px 20px;
  box-shadow: 0 8px 24px -16px rgba(15,23,42,0.4);
  transition: transform .2s, box-shadow .2s, border-color .2s;
  animation: rise .35s ease both;
  text-align: left;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-2);
  box-shadow: 0 16px 40px -18px rgba(79,70,229,0.5);
}
.card-top {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 10px;
}
.badge {
  font-size: 12px; font-weight: 700; color: #fff;
  padding: 4px 10px; border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-3));
}
.seq {
  display: inline-grid; place-items: center;
  min-width: 22px; height: 22px; padding: 0 6px;
  font-size: 12px; font-weight: 700; color: var(--primary-2);
  background: rgba(99, 102, 241, 0.12);
  border-radius: 999px;
}
.issue-title {
  font-size: 13.5px; color: var(--text-soft); font-weight: 600;
  text-decoration: none;
}
.issue-title:hover { color: var(--primary); }
.section-tag {
  font-size: 11.5px; font-weight: 700;
  padding: 3px 9px; border-radius: 6px;
  color: var(--primary-3);
  background: rgba(139,92,246,0.12);
  margin-left: auto;
}
.item-title {
  display: block;
  font-size: 17px; font-weight: 700; color: var(--text);
  text-decoration: none; line-height: 1.4;
  margin-bottom: 6px;
}
.item-title:hover { color: var(--primary); }
.snippet {
  font-size: 14px; color: var(--text-soft); line-height: 1.65;
  margin: 0;
}
.card-foot {
  margin-top: 12px;
  display: flex; align-items: center; justify-content: space-between;
}
.open-resource {
  font-size: 12.5px; font-weight: 600; color: var(--primary-2);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 4px;
}
.open-resource:hover { text-decoration: underline; }
.card-date { font-size: 12px; color: #94a3b8; }

/* 同刊去重：整期仅命中标题时的折叠汇总卡 */
.card-collapsed { cursor: default; }
.card-collapsed .collapsed-count {
  font-size: 11.5px; font-weight: 600;
  color: var(--text-soft);
  background: rgba(99, 102, 241, 0.10);
  border: 1px dashed rgba(99, 102, 241, 0.3);
  padding: 3px 9px; border-radius: 999px;
  margin-left: auto;
}
.card-collapsed.is-open .collapsed-count::after { content: " ▲"; }
.card-collapsed:not(.is-open) .collapsed-count::after { content: " ▼"; }
.collapsed-list {
  margin-top: 12px;
  display: flex; flex-direction: column;
  border-top: 1px solid rgba(99,102,241,0.12);
}
/* display:flex 会覆盖 [hidden] 默认的 display:none，必须显式声明 */
.collapsed-list[hidden] { display: none; }
.collapsed-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 4px;
  border-bottom: 1px solid rgba(99,102,241,0.08);
  text-decoration: none;
  transition: .15s;
}
.collapsed-row:last-child { border-bottom: none; }
.collapsed-row:hover { background: rgba(99,102,241,0.06); }
.collapsed-row-title {
  font-size: 14.5px; font-weight: 600; color: var(--text);
  flex: 1; min-width: 0;
}
.collapsed-row:hover .collapsed-row-title { color: var(--primary); }
.collapsed-row-section {
  font-size: 11.5px; font-weight: 700;
  padding: 3px 9px; border-radius: 6px;
  color: var(--primary-3);
  background: rgba(139,92,246,0.12);
  white-space: nowrap;
}

mark {
  background: linear-gradient(transparent 60%, rgba(251,191,36,0.7) 0);
  color: inherit;
  padding: 0 1px;
  border-radius: 3px;
}

.empty {
  text-align: center;
  color: var(--text-soft);
  padding: 40px 10px;
  font-size: 15px;
}

/* 页脚 */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px calc(48px + env(safe-area-inset-bottom));
  padding-left: max(20px, env(safe-area-inset-left));
  padding-right: max(20px, env(safe-area-inset-right));
  text-align: center;
  font-size: 12.5px;
  color: var(--text-soft);
  border-top: 1px solid rgba(99,102,241,0.1);
}
.footer a { color: var(--primary); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer .muted { color: #94a3b8; margin-top: 6px; }


/* 暗色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F172A;
    --text: #F1F5F9;
    --text-soft: #94a3b8;
    --glass: rgba(30, 41, 59, 0.55);
    --card-border: rgba(129,140,248,0.25);
  }
  .nav { background: linear-gradient(180deg, rgba(15,23,42,0.8), rgba(15,23,42,0.5)); }
  .github-link { background: rgba(30,41,59,0.5); }
  .chip { background: rgba(30,41,59,0.5); }
  #search { background: rgba(30,41,59,0.6); }
}

@media (max-width: 560px) {
  .hero { padding-top: 40px; padding-left: 16px; padding-right: 16px; }
  #search { font-size: 16px; padding: 15px 16px 15px 16px; }
  .card { padding: 15px 16px; }
  .brand-text p { display: none; }
  /* 窄屏下聚焦放大容易触发横向溢出，关闭它更稳 */
  #search:focus { transform: none; }
}

/* 针对 iPhone 12/13/14 标准版与 Pro（390px）等更窄机型细化 */
@media (max-width: 430px) {
  .nav-inner { padding: 10px 14px; gap: 8px; }
  .brand { gap: 9px; }
  .brand-mark { width: 36px; height: 36px; font-size: 17px; border-radius: 10px; }
  .brand-text h1 { font-size: 15.5px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .brand-text { min-width: 0; }
  .nav-actions .precision-toggle { gap: 2px; }
  .nav-actions .precision-opt { font-size: 12.5px; padding: 5px 11px; }
  .hero { padding-top: 32px; padding-left: 14px; padding-right: 14px; }
  #search { font-size: 16px; padding: 14px 16px 14px 44px; }
  .search-icon { left: 15px; }
  .results { padding-left: 14px; padding-right: 14px; }
  .ad-slot { padding-left: 14px; padding-right: 14px; }
  .footer { padding-left: 14px; padding-right: 14px; }
  .item-title { font-size: 16px; }
  .snippet { font-size: 13.5px; }
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: rgba(99,102,241,0.4); border-radius: 999px; }