@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --primary: #0000C4;
  --primary-soft: #3333d8;
  --primary-glow: rgba(0,0,196,0.07);
  --primary-10: rgba(0,0,196,0.06);
  --primary-20: rgba(0,0,196,0.12);
  --gray-50: #f7f8fb;
  --gray-100: #eef0f5;
  --gray-200: #dde1ea;
  --gray-300: #a0a7b8;
  --gray-400: #727a90;
  --gray-500: #515972;
  --gray-700: #2d3348;
  --gray-900: #111318;
  --white: #ffffff;
  --accent-warm: #D20F39;
  --accent-gold: #c59a1a;
  --sidebar-bg: #f4f5f9;

  --color-bench: #0000C4;
  --color-se: #bf616a;
  --color-fm: #0d9488;
  --color-seai: #7c3aed;
  --color-sec: #d97706;
}

[data-theme="dark"] {
  --primary: #4d6dff;
  --primary-soft: #7b8fff;
  --primary-glow: rgba(77,109,255,0.07);
  --primary-10: rgba(77,109,255,0.06);
  --primary-20: rgba(77,109,255,0.12);
  --gray-50: #131318;
  --gray-100: #25252e;
  --gray-200: #2a2a35;
  --gray-300: #55556a;
  --gray-400: #8b8b9a;
  --gray-500: #8b8b9a;
  --gray-700: #c8c8d0;
  --gray-900: #e8e8ed;
  --white: #09090b;
  --accent-warm: #f87171;
  --accent-gold: #fb923c;
  --sidebar-bg: #111115;

  --color-bench: #60a5fa;
  --color-se: #fca5a5;
  --color-fm: #5eead4;
  --color-seai: #c4b5fd;
  --color-sec: #fbbf24;
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  color: var(--gray-700); background: var(--white);
  line-height: 1.6; font-size: 16px;
  -webkit-font-smoothing: antialiased;
  zoom: 1.25;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 600; }

.page { display: flex; min-height: 100vh; }

/* ===== SIDEBAR ===== */
.sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--gray-700);
  position: fixed; top: 0; bottom: 0; left: 0;
  overflow-y: auto; z-index: 10;
  display: flex; flex-direction: column;
  padding: 2.5rem 1.5rem 1.5rem;
  border-right: 1px solid var(--gray-100);
}
.sidebar::-webkit-scrollbar { width: 0; }

.s-back {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-size: 0.78rem; font-weight: 500; color: var(--gray-400);
  text-decoration: none; margin-bottom: 1.5rem;
  transition: color 0.15s;
}
.s-back:hover { color: var(--primary); text-decoration: none; }

.s-avatar {
  width: 100px; height: 100px; border-radius: 50%;
  object-fit: cover; display: block; margin: 0 auto 0.75rem;
  border: 3px solid var(--gray-200);
  transition: border-color 0.3s;
}
.s-avatar:hover { border-color: var(--primary); }
.s-name {
  text-align: center; font-size: 1.15rem; font-weight: 700;
  color: var(--gray-900); letter-spacing: -0.3px; margin-bottom: 0.2rem;
}
.s-role { text-align: center; font-size: 0.75rem; color: var(--gray-500); margin-bottom: 1rem; line-height: 1.5; }

.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  gap: 0.5rem; margin: 0 auto 1rem;
  padding: 0.4rem 1rem; border-radius: 24px;
  background: rgba(0,0,196,0.08); border: 1.5px solid rgba(0,0,196,0.2);
  cursor: pointer; transition: all 0.3s;
  font-size: 0.75rem; font-weight: 600; color: #5566aa;
  width: fit-content; letter-spacing: 0.3px;
}
.theme-toggle:hover { opacity: 0.85; transform: scale(1.05); }
.theme-toggle .t-icon { font-size: 1rem; transition: transform 0.4s; }
.theme-toggle:hover .t-icon { transform: rotate(45deg); }

.s-divider { height: 1px; background: var(--gray-200); margin: 0.5rem 0; }

.s-nav { list-style: none; flex: 1; }
.s-nav li { margin-bottom: 1px; }
.s-nav a {
  display: block; padding: 0.4rem 0.7rem; border-radius: 6px;
  font-size: 0.78rem; font-weight: 500; color: var(--gray-700);
  text-decoration: none; transition: all 0.15s;
}
.s-nav a:hover { color: var(--gray-900); background: var(--gray-200); text-decoration: none; }
.s-nav a.active { color: var(--white); background: var(--primary); }

.s-topic-count {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem; color: var(--gray-400);
  margin-left: auto; padding: 1px 6px;
  background: var(--gray-100); border-radius: 8px;
}
.s-nav a { display: flex; align-items: center; }
.s-nav a.active .s-topic-count { background: rgba(255,255,255,0.2); color: rgba(255,255,255,0.8); }

.s-links {
  padding-top: 0.75rem; border-top: 1px solid var(--gray-200);
  display: flex; flex-direction: column; gap: 0.2rem;
}
.s-links a {
  font-size: 0.75rem; color: var(--gray-700); text-decoration: none;
  padding: 0.15rem 0; transition: color 0.15s;
}
.s-links a:hover { color: var(--primary); text-decoration: none; }

/* ===== MAIN ===== */
.main { margin-left: 240px; flex: 1; max-width: 52vw; }

/* ===== HERO ===== */
.hero {
  background: var(--white);
  padding: 2rem 2.5rem 1.5rem;
  border-bottom: 1px solid var(--gray-100);
}
.hero-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.58rem; font-weight: 500; letter-spacing: 2px;
  text-transform: uppercase; color: var(--primary);
  margin-bottom: 0.5rem; display: inline-block;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.15rem;
}
.hero h1 {
  font-size: 1.5rem; font-weight: 800; letter-spacing: -0.5px;
  line-height: 1.25; margin-bottom: 0.5rem; color: var(--gray-900);
}
.hero h1 .hl {
  background: linear-gradient(135deg, var(--primary), var(--primary-soft));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 0.88rem; color: var(--gray-500); line-height: 1.6; max-width: 560px;
}

/* ===== TOPIC FILTER BAR ===== */
.filter-bar {
  padding: 1rem 2.5rem;
  border-bottom: 1px solid var(--gray-100);
  background: var(--gray-50);
  display: flex; align-items: center; gap: 0.5rem;
  flex-wrap: wrap;
  position: sticky; top: 0; z-index: 5;
}
.filter-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem; font-weight: 500; color: var(--gray-400);
  text-transform: uppercase; letter-spacing: 1px;
  margin-right: 0.25rem;
}
.filter-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem; font-weight: 600; padding: 0.35rem 0.85rem;
  border-radius: 20px; border: 1.5px solid var(--gray-200);
  background: var(--white); color: var(--gray-500);
  cursor: pointer; transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 0.35rem;
}
.filter-btn:hover { border-color: var(--gray-300); color: var(--gray-700); }
.filter-btn.active {
  border-color: var(--primary); color: var(--primary);
  background: var(--primary-10);
}
.filter-btn .fb-count {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.62rem; opacity: 0.7;
}
.filter-btn[data-topic="bench"].active { border-color: var(--color-bench); color: var(--color-bench); background: rgba(0,0,196,0.06); }
.filter-btn[data-topic="se"].active { border-color: var(--color-se); color: var(--color-se); background: rgba(191,97,106,0.06); }
.filter-btn[data-topic="fm"].active { border-color: var(--color-fm); color: var(--color-fm); background: rgba(13,148,136,0.06); }
.filter-btn[data-topic="seai"].active { border-color: var(--color-seai); color: var(--color-seai); background: rgba(124,58,237,0.06); }
.filter-btn[data-topic="sec"].active { border-color: var(--color-sec); color: var(--color-sec); background: rgba(217,119,6,0.06); }

/* ===== TOPIC HEADER (shown when a topic is active) ===== */
.topic-banner {
  padding: 1.25rem 2.5rem;
  border-bottom: 1px solid var(--gray-100);
  display: none;
}
.topic-banner.visible { display: block; }
.topic-banner-inner {
  display: flex; align-items: flex-start; gap: 1rem;
}
.tb-icon {
  font-size: 2rem; flex-shrink: 0;
  width: 52px; height: 52px; display: flex; align-items: center; justify-content: center;
  border-radius: 12px; background: var(--gray-50); border: 1px solid var(--gray-200);
}
.tb-title { font-size: 1rem; font-weight: 700; color: var(--gray-900); margin-bottom: 0.15rem; }
.tb-desc { font-size: 0.8rem; color: var(--gray-500); line-height: 1.5; }
.tb-keywords { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-top: 0.4rem; }
.tb-kw {
  font-size: 0.62rem; font-weight: 500; padding: 0.12rem 0.45rem;
  border-radius: 3px; background: var(--gray-50); color: var(--gray-500);
  border: 1px solid var(--gray-100);
}

/* ===== PAPER GRID ===== */
.papers-section {
  padding: 1.25rem 2.5rem 2rem;
}
.papers-count {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem; color: var(--gray-400);
  margin-bottom: 1rem;
}
.papers-count strong { color: var(--gray-700); font-weight: 600; }

.paper-grid {
  display: flex; flex-direction: column; gap: 8px;
}

/* ===== PAPER CARD ===== */
.paper-card {
  display: flex; gap: 14px; padding: 14px 16px;
  border-radius: 10px; background: var(--gray-50);
  border: 1px solid transparent;
  transition: all 0.2s;
  position: relative;
}
.paper-card:hover {
  border-color: var(--gray-200);
  background: var(--gray-100);
}
.paper-card.hidden {
  display: none;
}
.paper-card {
  opacity: 0; transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.paper-card.visible {
  opacity: 1; transform: translateY(0);
}

.pc-left {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  min-width: 60px; flex-shrink: 0;
}
.pc-venue {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem; font-weight: 600;
  padding: 3px 8px; border-radius: 5px;
  text-transform: uppercase; letter-spacing: 0.3px;
  white-space: nowrap; text-align: center;
}
.pc-venue.v-bench { background: rgba(0,0,196,0.08); color: var(--color-bench); }
.pc-venue.v-se { background: rgba(191,97,106,0.08); color: var(--color-se); }
.pc-venue.v-fm { background: rgba(13,148,136,0.08); color: var(--color-fm); }
.pc-venue.v-seai { background: rgba(124,58,237,0.08); color: var(--color-seai); }
.pc-venue.v-sec { background: rgba(217,119,6,0.08); color: var(--color-sec); }

.pc-year {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.62rem; color: var(--gray-400);
}

.pc-body { flex: 1; min-width: 0; }
.pc-title {
  font-size: 0.85rem; font-weight: 600; color: var(--gray-900);
  line-height: 1.4; margin-bottom: 3px;
}
.pc-authors {
  font-size: 0.75rem; color: var(--gray-500); line-height: 1.45;
  margin-bottom: 4px;
}
.pc-authors .me { color: var(--accent-warm); font-weight: 600; }

.pc-topic-tag {
  display: inline-block;
  font-size: 0.6rem; font-weight: 600; padding: 2px 8px;
  border-radius: 10px; text-transform: uppercase; letter-spacing: 0.3px;
  margin-right: 4px;
}
.pc-topic-tag.t-bench { background: rgba(0,0,196,0.08); color: var(--color-bench); }
.pc-topic-tag.t-se { background: rgba(191,97,106,0.08); color: var(--color-se); }
.pc-topic-tag.t-fm { background: rgba(13,148,136,0.08); color: var(--color-fm); }
.pc-topic-tag.t-seai { background: rgba(124,58,237,0.08); color: var(--color-seai); }
.pc-topic-tag.t-sec { background: rgba(217,119,6,0.08); color: var(--color-sec); }

.pc-links { display: flex; gap: 4px; margin-top: 6px; flex-wrap: wrap; }
.pc-link {
  font-size: 0.68rem; font-weight: 500; color: var(--primary); padding: 2px 10px;
  border-radius: 4px; background: var(--white); text-decoration: none;
  border: 1px solid var(--gray-100); transition: all 0.15s;
}
.pc-link:hover { border-color: var(--primary); text-decoration: none; }
[data-theme="dark"] .pc-link { background: #1a1a22; }

.pc-impact {
  font-size: 0.68rem; color: var(--primary); margin-top: 3px;
  font-weight: 500;
}

/* ===== AWARD BADGE on card ===== */
.pc-award {
  font-size: 0.62rem; font-weight: 600;
  color: var(--accent-warm); margin-bottom: 2px;
}

/* ===== FOOTER ===== */
.footer {
  padding: 0.85rem 2.5rem; border-top: 1px solid var(--gray-100);
  font-size: 0.72rem; color: var(--gray-400); text-align: center;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  body { zoom: 1; }
  .page { flex-direction: column; }

  .sidebar {
    position: relative; width: 100%;
    flex-direction: row; flex-wrap: wrap;
    align-items: center; justify-content: center;
    padding: 1rem 1.25rem;
    border-right: none; border-bottom: 1px solid var(--gray-100);
    gap: 0.5rem;
  }
  .s-back { order: -1; width: 100%; margin-bottom: 0.5rem; }
  .s-avatar { width: 56px; height: 56px; margin: 0; flex-shrink: 0; }
  .s-name { text-align: left; font-size: 1rem; width: auto; margin-bottom: 0; }
  .s-role { text-align: left; font-size: 0.68rem; margin-bottom: 0; width: auto; }
  .s-nav { display: none; }
  .s-divider { display: none; }
  .theme-toggle { order: 10; margin: 0; }
  .s-links { order: 11; width: 100%; flex-direction: row; flex-wrap: wrap; gap: 0.5rem; justify-content: center; font-size: 0.7rem; }

  .main { margin-left: 0 !important; max-width: 100% !important; }
  .hero, .papers-section { padding-left: 1.25rem; padding-right: 1.25rem; }
  .filter-bar { padding-left: 1.25rem; padding-right: 1.25rem; }
  .topic-banner { padding-left: 1.25rem; padding-right: 1.25rem; }
  .hero h1 { font-size: 1.15rem; }
  .paper-card { flex-direction: column; gap: 6px; }
  .pc-left { flex-direction: row; min-width: auto; }
}

@media (max-width: 480px) {
  body { font-size: 14px; }

  .sidebar {
    flex-direction: column; align-items: center;
    padding: 0.75rem; gap: 0.2rem;
  }
  .s-avatar { width: 48px; height: 48px; }
  .s-name { text-align: center; font-size: 0.9rem; }
  .s-role { text-align: center; font-size: 0.62rem; }

  .hero { padding: 1rem; }
  .hero-eyebrow { font-size: 0.5rem; }
  .hero h1 { font-size: 0.95rem; }
  .hero-desc { font-size: 0.75rem; }
  .filter-bar { padding: 0.75rem; gap: 0.35rem; }
  .filter-btn { font-size: 0.65rem; padding: 0.25rem 0.6rem; }
  .papers-section { padding: 1rem 0.85rem; }
  .pc-title { font-size: 0.75rem; }
  .pc-authors { font-size: 0.65rem; }
  .pc-link { font-size: 0.6rem; }
  .footer { font-size: 0.6rem; padding: 0.6rem 0.85rem; }
}