/* ============================================================
   投资研究 · 分析聚合 — 主站样式
   延续分析页的研究报告美学：米白 + 琥珀 + 宋体衬线
   ============================================================ */

:root {
  /* light (default) — 与分析页一致 */
  --bg:            #F7F5F3;
  --bg-secondary:  #FFFFFF;
  --bg-card:       #FFFFFF;
  --bg-elevated:   #FAFAF9;
  --bg-warm:       #F5F2EE;
  --bg-code:       #EFECE8;

  --text:          #2D2926;
  --text-secondary:#5C5652;
  --text-muted:    #8A8480;
  --text-light:    #A8A29E;

  --accent:        #D97706;
  --accent-soft:   #FEF3C7;
  --accent-hover:  #B45309;

  --border:        #E5E2DE;
  --border-light:  #F0EEEC;
  --border-strong: #D6D2CC;

  --red:   #DC2626;
  --green: #059669;
  --blue:  #2563EB;
  --gold:  #D97706;
  --purple:#7C3AED;

  --shadow-sm: 0 1px 2px rgba(45,41,38,.04), 0 1px 3px rgba(45,41,38,.06);
  --shadow-md: 0 4px 16px rgba(45,41,38,.06), 0 2px 6px rgba(45,41,38,.04);
  --shadow-lg: 0 12px 40px rgba(217,119,6,.10), 0 4px 12px rgba(45,41,38,.05);

  --radius:    14px;
  --radius-sm: 10px;
  --radius-lg: 20px;

  --nav-h: 64px;
  --maxw:   1180px;
}

[data-theme="dark"] {
  --bg:            #1C1917;
  --bg-secondary:  #292524;
  --bg-card:       #292524;
  --bg-elevated:   #1F1B17;
  --bg-warm:       #2A2520;
  --bg-code:       #2A2520;

  --text:          #F5F5F4;
  --text-secondary:#D6D3D1;
  --text-muted:    #A8A29E;
  --text-light:    #78716C;

  --accent:        #F59E0B;
  --accent-soft:   #422006;
  --accent-hover:  #FBBF24;

  --border:        #44403C;
  --border-light:  #292524;
  --border-strong: #57534E;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', Georgia, serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background .25s ease, color .25s ease;
}

h1, h2, h3, h4 { font-family: inherit; font-weight: 600; letter-spacing: .01em; line-height: 1.3; }
a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); }

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select { font-family: inherit; }

::selection { background: var(--accent-soft); color: var(--accent-hover); }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border-light);
}
.nav-inner {
  max-width: var(--maxw); height: 100%; margin: 0 auto;
  padding: 0 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo { display: inline-flex; align-items: center; gap: 12px; color: var(--text); font-weight: 600; font-size: 1.02rem; }
.nav-logo:hover { color: var(--accent); }
.nav-logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent); color: #fff; font-size: .95rem; font-weight: 700;
  box-shadow: 0 2px 8px rgba(217,119,6,.35);
}
.nav-logo-text { letter-spacing: .02em; }

.nav-tools { display: flex; align-items: center; gap: 12px; }

.search {
  position: relative; display: flex; align-items: center;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: 999px; padding: 0 14px; height: 38px; width: 280px;
  transition: border-color .15s, box-shadow .15s, background .25s;
}
.search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-icon { color: var(--text-muted); flex-shrink: 0; }
.search input {
  border: none; background: none; outline: none; color: var(--text);
  width: 100%; height: 100%; padding: 0 10px; font-size: .95rem;
}
.search input::placeholder { color: var(--text-muted); }
.search-kbd {
  font-family: 'Inter', sans-serif; font-size: .72rem; color: var(--text-muted);
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  padding: 1px 7px; line-height: 1.6;
}

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text-secondary);
  transition: all .15s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ===== Hero ===== */
.hero { padding: 72px 32px 40px; }
.hero-inner { max-width: var(--maxw); margin: 0 auto; }
.kicker {
  color: var(--accent); font-size: .82rem; letter-spacing: .22em; font-weight: 600;
  margin-bottom: 20px; font-family: 'Inter', sans-serif;
}
.hero h1 { font-size: 2.6rem; margin-bottom: 18px; max-width: 820px; }
.hero-dek { max-width: 680px; font-size: 1.12rem; color: var(--text-secondary); line-height: 1.85; margin-bottom: 36px; }

.stats {
  display: flex; flex-wrap: wrap; gap: 14px;
}
.stat {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 22px; min-width: 132px;
  box-shadow: var(--shadow-sm);
}
.stat-num { font-size: 1.7rem; font-weight: 700; color: var(--accent); line-height: 1.1; font-family: 'Inter', sans-serif; }
.stat-label { font-size: .82rem; color: var(--text-muted); margin-top: 4px; letter-spacing: .04em; }

/* ===== Filters ===== */
.filters { padding: 8px 32px 28px; }
.filters-inner { max-width: var(--maxw); margin: 0 auto; }
.filter-row {
  display: flex; align-items: flex-start; gap: 16px; padding: 10px 0;
  border-top: 1px dashed var(--border);
}
.filter-row:first-child { border-top: none; }
.filter-row--tools { justify-content: space-between; align-items: center; border-top: 1px solid var(--border); margin-top: 4px; padding-top: 16px; }
.filter-label {
  flex-shrink: 0; width: 48px; font-size: .82rem; color: var(--text-muted);
  letter-spacing: .08em; padding-top: 7px; font-family: 'Inter', sans-serif;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 999px; font-size: .88rem;
  background: var(--bg-elevated); border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer; transition: all .15s; white-space: nowrap;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip .chip-count { font-size: .76rem; opacity: .7; font-family: 'Inter', sans-serif; }
.chip.active .chip-count { opacity: .85; }
.chip-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

.sort { display: flex; align-items: center; gap: 10px; }
.sort select {
  appearance: none; -webkit-appearance: none;
  background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text);
  padding: 7px 30px 7px 14px; border-radius: 999px; font-size: .88rem; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238A8480' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center;
}
.sort select:focus { outline: none; border-color: var(--accent); }
.result-count { font-size: .85rem; color: var(--text-muted); font-family: 'Inter', sans-serif; }

/* ===== Grid ===== */
.main { padding: 8px 32px 80px; }
.grid {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 24px;
}

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; text-decoration: none; color: inherit;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  box-shadow: var(--shadow-sm);
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--card-color, var(--accent));
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }
.card:hover .card-title { color: var(--accent); }

.card-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 18px 22px 0;
}
.card-cat {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .76rem; font-weight: 600; letter-spacing: .06em;
  color: var(--card-color, var(--accent)); font-family: 'Inter', sans-serif;
}
.card-cat::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.card-date { font-size: .78rem; color: var(--text-muted); font-family: 'Inter', sans-serif; }

.card-body { padding: 10px 22px 16px; flex: 1; display: flex; flex-direction: column; }
.card-title { font-size: 1.16rem; font-weight: 600; line-height: 1.4; margin: 6px 0 10px; transition: color .15s; }
.card-summary { font-size: .92rem; color: var(--text-secondary); line-height: 1.7; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; padding: 14px 22px 0; }
.card-tag {
  font-size: .74rem; padding: 3px 9px; border-radius: 6px;
  background: var(--bg-warm); color: var(--text-muted); border: 1px solid var(--border-light);
  font-family: 'Inter', sans-serif;
}

.card-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px 18px; margin-top: auto;
}
.card-read {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .86rem; font-weight: 600; color: var(--accent); font-family: 'Inter', sans-serif;
}
.card-read svg { transition: transform .2s; }
.card:hover .card-read svg { transform: translateX(3px); }
.card-id { font-size: .72rem; color: var(--text-light); font-family: 'Inter', sans-serif; }

/* ===== Empty ===== */
.empty { max-width: var(--maxw); margin: 40px auto; text-align: center; padding: 60px 32px; }
.empty-mark { font-size: 3rem; color: var(--text-light); margin-bottom: 12px; }
.empty-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 6px; }
.empty-hint { color: var(--text-muted); margin-bottom: 22px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 20px; border-radius: 999px; font-size: .9rem; font-weight: 600;
  background: var(--accent); color: #fff; transition: background .15s;
}
.btn:hover { background: var(--accent-hover); }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 32px; background: var(--bg-elevated); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; text-align: center; }
.footer p { color: var(--text-muted); font-size: .88rem; line-height: 1.9; }
.footer code { font-family: 'Inter', monospace; background: var(--bg-code); padding: 1px 6px; border-radius: 4px; font-size: .82rem; color: var(--text-secondary); }
.footer-meta { font-size: .8rem !important; opacity: .8; margin-top: 4px; }

/* ===== Loading ===== */
.loading { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 80px; color: var(--text-muted); gap: 14px; }
.spinner { width: 32px; height: 32px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.error-box { max-width: 560px; margin: 60px auto; padding: 32px; background: var(--bg-card); border: 1px solid var(--border); border-left: 4px solid var(--red); border-radius: var(--radius); }
.error-box h3 { color: var(--red); margin-bottom: 10px; }
.error-box p { color: var(--text-secondary); margin-bottom: 8px; font-size: .92rem; }
.error-box code { font-family: monospace; background: var(--bg-code); padding: 1px 6px; border-radius: 4px; font-size: .85rem; }

/* ===== Responsive ===== */
@media (max-width: 760px) {
  .nav-inner { padding: 0 18px; gap: 12px; }
  .nav-logo-text { display: none; }
  .search { width: 0; flex: 1; }
  .search-kbd { display: none; }
  .hero { padding: 48px 18px 32px; }
  .hero h1 { font-size: 2rem; }
  .hero-dek { font-size: 1rem; }
  .stat { min-width: 100px; padding: 14px 16px; }
  .stat-num { font-size: 1.4rem; }
  .filters, .main { padding-left: 18px; padding-right: 18px; }
  .filter-row { flex-direction: column; gap: 8px; }
  .filter-label { width: auto; padding-top: 0; }
  .filter-row--tools { flex-direction: column; align-items: flex-start; gap: 10px; }
  .grid { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 460px) {
  .hero h1 { font-size: 1.7rem; }
  .card-title { font-size: 1.05rem; }
}

/* fade-in for cards */
.card { animation: fadeUp .4s ease backwards; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }