@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

/* ── Tokens (Solarized Light) ───────────────────────────── */
:root {
  --sol-base03:  #002b36;
  --sol-base02:  #073642;
  --sol-base01:  #586e75;
  --sol-base00:  #657b83;
  --sol-base0:   #839496;
  --sol-base1:   #93a1a1;
  --sol-base2:   #eee8d5;
  --sol-base3:   #fdf6e3;
  --sol-yellow:  #b58900;
  --sol-blue:    #268bd2;
  --sol-cyan:    #2aa198;
  --sol-orange:  #cb4b16;
  --sol-red:     #dc322f;
  --sol-green:   #859900;
  --bg-panel:    rgba(253,246,227,0.92);
  --bg-overlay:  rgba(0,0,0,0.32);
  --glass:       rgba(253,246,227,0.80);
  --glass-border: rgba(88,110,117,0.18);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0; padding: 0;
  background: transparent;
  overflow: hidden;
  font-family: 'Poppins', sans-serif;
  color: var(--sol-base1);
}

/* ── Full-viewport chart ─────────────────────────────────── */
#chart {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
}
#chart canvas,
#chart svg {
  position: absolute;
  top: 0; left: 0;
  width: 100% !important;
  height: 100% !important;
  background: transparent !important;
}

/* ── Title bar (top center) ──────────────────────────────── */
#title-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding: 18px 20px 10px;
  pointer-events: none;
}

#title-content {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  background: transparent;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 10px 26px 10px 26px;
  pointer-events: all;
  flex-wrap: wrap;
  justify-content: center;
  /* No hard border — just a very subtle background blur */
  border-radius: 50px;
  /* Faint halo so text is readable over the graph */
  text-shadow: 0 1px 8px rgba(253,246,227,0.6);
}

#title-prefix {
  font-family: 'Poppins', sans-serif;
  font-size: 15px;
  font-weight: 400;
  color: var(--sol-base01);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

#niche-select {
  font-family: 'Poppins', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--sol-base02);
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--sol-blue);
  border-radius: 0;
  padding: 2px 22px 2px 2px;
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23268bd2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px center;
  background-size: 10px 6px;
}
#niche-select:focus { border-bottom-color: var(--sol-orange); }

/* ── Controls wrap (bottom-left) ────────────────────────── */
#controls-wrap {
  position: fixed;
  bottom: 20px;
  left: 16px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

#controls-panel {
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 14px 16px;
  min-width: 200px;
  box-shadow: 0 4px 20px rgba(0,43,54,0.12);
  font-family: 'Poppins', sans-serif;
}

#controls-toggle {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,43,54,0.12);
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s, transform 0.2s;
  color: var(--sol-base01);
}
#controls-toggle:hover { background: rgba(38,139,210,0.15); }
#controls-toggle.active { background: rgba(38,139,210,0.20); transform: rotate(30deg); }

/* Toggle checkboxes */
.toggle-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.toggle-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--sol-base02);
  cursor: pointer; font-family: 'Poppins', sans-serif;
}
.toggle-label input[type="checkbox"] {
  width: 14px; height: 14px;
  accent-color: var(--sol-blue); cursor: pointer;
}

/* Metric controls */
.metric-controls {
  padding-top: 10px;
  border-top: 1px solid rgba(7,54,66,0.10);
  display: flex; flex-direction: column; gap: 6px;
}
.metric-label {
  font-size: 11px; font-weight: 700;
  color: var(--sol-base01); text-transform: uppercase;
  letter-spacing: 0.05em; margin-top: 4px;
  font-family: 'Poppins', sans-serif;
}
.metric-controls select {
  padding: 3px 6px;
  background: rgba(255,255,255,0.7);
  color: var(--sol-base02);
  border: 1px solid rgba(88,110,117,0.25);
  border-radius: 6px;
  font-size: 11px; cursor: pointer;
  font-family: 'Poppins', sans-serif;
  outline: none;
}
.metric-controls select:focus { border-color: var(--sol-blue); }

/* Legend */
.niche-legend {
  border-top: 1px solid rgba(7,54,66,0.10);
  padding-top: 10px; margin-top: 10px;
  font-family: 'Poppins', sans-serif;
}
.legend-row {
  display: flex; align-items: center; gap: 8px; margin-bottom: 5px;
}
.legend-dot {
  width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0;
  background: #1c2833;
}
.legend-label {
  font-size: 11px; color: var(--sol-base01);
  white-space: nowrap; overflow: hidden;
  text-overflow: ellipsis; max-width: 160px;
  font-family: 'Poppins', sans-serif;
}

/* ── Timeline (bottom center) ───────────────────────────── */
#timeline-wrap {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Toggle button — inline left of the bar */
#timeline-toggle {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,43,54,0.10);
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  color: var(--sol-base01);
  transition: background 0.15s;
  flex-shrink: 0;
}
#timeline-toggle:hover { background: rgba(38,139,210,0.15); }
#timeline-toggle.active { background: rgba(38,139,210,0.20); }

.timeline-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 40px;
  padding: 8px 20px;
  box-shadow: 0 4px 20px rgba(0,43,54,0.12);
  font-family: 'Poppins', sans-serif;
  min-width: 380px;
}

#playBtn {
  background: var(--sol-blue);
  border: none; border-radius: 50%;
  color: #fff; font-size: 12px;
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0;
  transition: background 0.15s;
}
#playBtn:hover { background: #1a7cbf; }

#yearSlider {
  flex: 1; accent-color: var(--sol-blue);
  height: 4px; cursor: pointer;
  -webkit-appearance: none; appearance: none;
  background: rgba(7,54,66,0.15);
  border-radius: 2px; outline: none; min-width: 180px;
}
#yearSlider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--sol-blue); cursor: pointer;
  box-shadow: 0 0 0 3px rgba(38,139,210,0.25);
}
#yearSlider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--sol-blue); cursor: pointer;
  border: none; box-shadow: 0 0 0 3px rgba(38,139,210,0.25);
}

#yearLabel {
  font-size: 18px; font-weight: 700;
  color: var(--sol-base02); min-width: 44px;
  text-align: right; font-variant-numeric: tabular-nums;
  font-family: 'Poppins', sans-serif;
}
.year-range {
  font-size: 10px; color: var(--sol-base1); flex-shrink: 0;
  font-family: 'Poppins', sans-serif;
}

/* ── Snapshot counter (bottom right, floating) ─────────────── */
#snapshot-counter {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 100;
  display: flex; flex-direction: column; align-items: flex-end; gap: 2px;
  background: transparent;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 12px;
  padding: 6px 16px;
  font-family: 'Poppins', sans-serif;
  font-size: 14px; font-weight: 500;
  color: var(--sol-base01);
  pointer-events: none;
  text-shadow: 0 1px 8px rgba(253,246,227,0.5);
}
#snapshot-counter .sc-sep { display: none; }

/* ── Tooltip ─────────────────────────────────────────────── */
#tooltip {
  position: fixed;
  background: var(--bg-panel);
  border: 1px solid rgba(7,54,66,0.15);
  border-radius: 8px;
  padding: 12px 14px;
  pointer-events: none;
  font-size: 12px; max-width: 270px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.14);
  z-index: 200; opacity: 0;
  color: var(--sol-base02);
  transition: opacity 0.12s;
  top: 0; left: 0;
  font-family: 'Poppins', sans-serif;
}
.tooltip-name {
  font-weight: 700; font-size: 13px; color: var(--sol-base02); margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  max-height: 4.2em;
  line-height: 1.4;
}
.tooltip-detail { color: var(--sol-base01); margin: 2px 0; font-size: 11px; }
#tooltip { max-height: 140px; overflow: hidden; }

/* ── Loading overlay ────────────────────────────────────── */
#loading-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: var(--sol-base3);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 14px; transition: opacity 0.4s;
}
#loading-overlay.hidden { opacity: 0; pointer-events: none; }
.loading-spinner {
  width: 38px; height: 38px;
  border: 3px solid rgba(7,54,66,0.15);
  border-top-color: var(--sol-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 13px; color: var(--sol-base01); }


/* ── Detail overlay / modal ─────────────────────────────── */
.detail-overlay {
  display: none; position: fixed; inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(4px); z-index: 2000;
  align-items: center; justify-content: center;
}
.detail-overlay.open { display: flex; }
.detail-panel {
  background: var(--bg-panel); border-radius: 14px;
  width: min(680px, 92vw); max-height: 88vh;
  display: flex; flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.22);
  opacity: 0; transform: scale(0.94);
  transition: opacity 0.22s ease, transform 0.22s ease;
  overflow: hidden;
}
.detail-panel.open { opacity: 1; transform: scale(1); }
.detail-header {
  padding: 20px 22px 14px;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  position: relative; flex-shrink: 0;
}
.detail-close {
  position: absolute; top: 14px; right: 16px;
  background: none; border: none; font-size: 22px; line-height: 1;
  color: var(--sol-base01); cursor: pointer; padding: 2px 6px;
  border-radius: 6px; transition: background 0.12s;
}
.detail-close:hover { background: rgba(0,0,0,0.07); }
.detail-author-name {
  font-size: 18px; font-weight: 700; color: var(--sol-base02);
  margin-bottom: 6px; padding-right: 36px; font-family: 'Poppins', sans-serif;
}
.detail-author-meta {
  font-size: 12px; color: var(--sol-base01);
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-family: 'Poppins', sans-serif;
}
.detail-author-link { color: var(--sol-blue); text-decoration: none; font-weight: 600; font-size: 12px; }
.detail-author-link:hover { text-decoration: underline; }

/* ── Papers list ────────────────────────────────────────── */
.detail-papers { overflow-y: auto; padding: 14px 22px 20px; flex: 1; }
.paper-year-label {
  position: sticky; top: 0; background: var(--bg-panel);
  font-size: 11px; font-weight: 700; color: var(--sol-base1);
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 6px 0 4px; z-index: 1; font-family: 'Poppins', sans-serif;
}
.paper-item {
  border: 1px solid rgba(0,0,0,0.09); border-radius: 8px;
  margin-bottom: 8px; overflow: hidden; transition: border-color 0.15s;
}
.paper-item:hover { border-color: rgba(38,139,210,0.35); }
.paper-item-header {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 12px; cursor: pointer; user-select: none;
}
.paper-chevron {
  flex-shrink: 0; font-size: 10px; color: var(--sol-base1);
  margin-top: 3px; transition: transform 0.18s;
}
.paper-item.expanded .paper-chevron { transform: rotate(90deg); }
.paper-title {
  font-size: 13px; font-weight: 600; color: var(--sol-base02);
  line-height: 1.35; margin-bottom: 2px; font-family: 'Poppins', sans-serif;
}
.paper-source { font-size: 11px; color: var(--sol-base00); font-style: italic; font-family: 'Poppins', sans-serif; }
.paper-details { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.22s ease; }
.paper-item.expanded .paper-details { grid-template-rows: 1fr; }
.paper-details-inner { overflow: hidden; padding: 0 12px; }
.paper-item.expanded .paper-details-inner { overflow: visible; padding: 0 12px 12px; }
.paper-doi-link {
  display: inline-block; font-size: 11px; font-weight: 600;
  color: var(--sol-blue); background: rgba(38,139,210,0.1);
  border-radius: 20px; padding: 3px 12px; text-decoration: none;
  transition: background 0.12s; font-family: 'Poppins', sans-serif;
}
.paper-doi-link:hover { background: rgba(38,139,210,0.2); }

/* ── Topic relevance bar ─────────────────────────────────── */
.topic-bar { display: flex; gap: 3px; height: 14px; border-radius: 4px; margin-bottom: 12px; }
.topic-section {
  flex: 1; background: rgba(0,0,0,0.04);
  border-radius: 3px; display: flex; align-items: center;
  justify-content: center; position: relative; cursor: default;
}
.topic-section::after {
  content: attr(data-tip);
  position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translateX(-50%);
  background: var(--sol-base02); color: #cfd8dc;
  font-size: 10px; font-family: 'Poppins', sans-serif;
  white-space: nowrap; padding: 3px 7px; border-radius: 4px;
  opacity: 0; pointer-events: none; transition: opacity 0.15s; z-index: 10;
}
.topic-section:hover::after { opacity: 1; }
.topic-fill {
  width: calc(var(--score, 0) * 100%); height: 100%;
  background: var(--tc); border-radius: 3px; opacity: 0.75;
}