:root {
  --bg: #f4f4f4;
  --layer: #ffffff;
  --layer-accent: #e0e0e0;
  --field: #f4f4f4;
  --border-subtle: #e0e0e0;
  --border-strong: #8d8d8d;
  --text: #161616;
  --text-secondary: #525252;
  --text-placeholder: #a8a8a8;
  --interactive: #0f62fe;
  --interactive-hover: #0353e9;
  --interactive-active: #002d9c;
  --button-secondary: #393939;
  --button-secondary-hover: #4c4c4c;
  --support-error: #da1e28;
  --support-success: #198038;
  --support-warning: #f1c21b;
  --inverse-bg: #161616;
  --inverse-text: #ffffff;
  --inverse-text-secondary: #c6c6c6;
  --focus: #0f62fe;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --layer: #262626;
    --layer-accent: #393939;
    --field: #393939;
    --border-subtle: #393939;
    --border-strong: #6f6f6f;
    --text: #f4f4f4;
    --text-secondary: #c6c6c6;
    --text-placeholder: #6f6f6f;
    --interactive: #0f62fe;
    --interactive-hover: #0353e9;
    --interactive-active: #002d9c;
    --button-secondary: #6f6f6f;
    --button-secondary-hover: #606060;
    --support-error: #fa4d56;
    --support-success: #42be65;
    --support-warning: #f1c21b;
    --inverse-bg: #262626;
    --inverse-text: #f4f4f4;
    --inverse-text-secondary: #a8a8a8;
    --focus: #ffffff;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  font-size: 14px;
  line-height: 1.4;
  color: var(--text);
  background: var(--bg);
}

/* ---------- top bar ---------- */
.topbar {
  height: 48px;
  background: var(--inverse-bg);
  color: var(--inverse-text);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
}
.topbar-name { font-weight: 600; font-size: 14px; }
.topbar-sub { font-size: 14px; color: var(--inverse-text-secondary); }

.topbar-link {
  margin-left: auto;
  cursor: default;
  font-size: 12px;
  color: var(--inverse-text-secondary);
  text-decoration: none;
  padding: 0 12px;
  line-height: 48px;
}
.topbar-link:hover { color: var(--inverse-text); text-decoration: underline; }
.topbar-link:focus-visible { outline: 2px solid #ffffff; outline-offset: -2px; }

.lang-picker {
  appearance: none;
  border: none;
  font: inherit;
  font-size: 12px;
  color: var(--inverse-text);
  background: transparent;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23c6c6c6' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  height: 32px;
  padding: 0 26px 0 8px;
}
.lang-picker:hover { background-color: rgba(141, 141, 141, 0.24); }
.lang-picker:focus-visible { outline: 2px solid #ffffff; outline-offset: -2px; }
.lang-picker option { color: #161616; background: #ffffff; }

/* ---------- tabs ---------- */
.tabs {
  display: flex;
  background: var(--bg);
  border-bottom: 1px solid var(--border-subtle);
}
.tab {
  appearance: none;
  border: none;
  background: transparent;
  font: inherit;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--text); }
.tab--active {
  color: var(--text);
  font-weight: 600;
  border-bottom-color: var(--interactive);
}
.tab:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }

/* ---------- layout ---------- */
main { max-width: 1200px; margin: 0 auto; padding: 24px 16px 128px; }

/* ---------- settings view ---------- */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
}
@media (max-width: 1000px) { .settings-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .settings-grid { grid-template-columns: 1fr; } }
.settings-group {
  background: var(--layer);
  padding: 16px;
}
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background: var(--layer);
  border-top: 1px solid var(--border-subtle);
}
.dock-inner { max-width: 1200px; margin: 0 auto; }
.settings-actions {
  display: flex;
  justify-content: flex-end;
}
.settings-actions .btn { min-width: 264px; }

.section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.16px;
  margin: 24px 0 8px;
}
.section-title:first-child { margin-top: 0; }

.field { margin-bottom: 16px; }
.field label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.field output { color: var(--text); font-variant-numeric: tabular-nums; }
.field-note { font-size: 11px; color: var(--text-secondary); margin: -8px 0 16px; }
.field-note--top { margin: -4px 0 12px; }

input[type="number"] {
  -webkit-user-select: text;
  user-select: text;
  width: 100%;
  height: 40px;
  padding: 0 12px;
  font: inherit;
  color: var(--text);
  background: var(--field);
  border: none;
  border-bottom: 1px solid var(--border-strong);
}
input[type="number"]:focus { outline: 2px solid var(--focus); outline-offset: -2px; }

input[type="range"] {
  width: 100%;
  height: 16px;
  appearance: none;
  background: transparent;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--border-strong);
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text);
  margin-top: -6px;
}
input[type="range"]:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
input[type="range"]::-moz-range-track { height: 2px; background: var(--border-strong); }
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border: none; border-radius: 50%; background: var(--text);
}

.check {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.check label { font-size: 12px; color: var(--text-secondary); }
input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--interactive);
}
input[type="checkbox"]:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------- buttons ---------- */
.btn {
  font: inherit;
  height: 48px;
  padding: 0 16px;
  text-align: left;
  border: none;
}
.btn--primary { background: var(--interactive); color: #ffffff; }
.btn--primary:hover { background: var(--interactive-hover); }
.btn--primary:active { background: var(--interactive-active); }
.btn--secondary { background: var(--button-secondary); color: #ffffff; }
.btn--secondary:hover { background: var(--button-secondary-hover); }
.btn--block { width: 100%; }
.btn--danger { background: var(--support-error); color: #ffffff; }
.btn--danger:hover { background: #ba1b23; }
.btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; box-shadow: inset 0 0 0 2px #ffffff; }

/* ---------- simulation bar ---------- */
.sim-bar {
  display: grid;
  grid-template-columns: 1fr 200px auto;
  gap: 1px;
  background: var(--border-subtle);
}
@media (max-width: 800px) {
  .sim-bar { grid-template-columns: 1fr 1fr; }
  .sim-actions { grid-column: 1 / -1; }
}
.sim-bar > * { background: var(--layer); }
.clock {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}
.clock-time { font-size: 20px; font-weight: 300; font-variant-numeric: tabular-nums; }
.clock-bar { height: 4px; background: var(--field); }
.clock-fill { height: 100%; width: 0; background: var(--interactive); transition: width 120ms linear; }
.sim-speed { margin: 0; padding: 12px 16px; display: flex; flex-direction: column; justify-content: center; }
.sim-actions { display: flex; gap: 1px; background: var(--border-subtle); }
.sim-actions .btn { flex: 1; min-width: 176px; height: auto; min-height: 48px; }

/* ---------- stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  background: var(--border-subtle);
  border: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}
@media (max-width: 800px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.stat { background: var(--layer); padding: 12px 16px; }
.stat-label { display: block; font-size: 12px; color: var(--text-secondary); }
.stat-value { display: block; font-size: 24px; font-weight: 300; font-variant-numeric: tabular-nums; }

/* ---------- feed + timeline ---------- */
.results-grid {
  display: grid;
  grid-template-columns: minmax(0, 600px) minmax(264px, 1fr);
  gap: 16px;
  align-items: start;
}
@media (max-width: 1000px) {
  .results-grid { grid-template-columns: 1fr; }
}

.timeline {
  background: var(--layer);
  padding: 12px 16px;
}
.timeline .section-title { margin: 0 0 8px; }
.timeline-list {
  list-style: none;
  max-height: 480px;
  overflow-y: auto;
}
.timeline-item {
  display: flex;
  gap: 8px;
  padding: 4px 0;
  font-size: 11px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}
.timeline-item:first-child { border-top: none; }
.timeline-item--neg .timeline-text { color: var(--support-error); }
.timeline-time {
  flex: none;
  font-variant-numeric: tabular-nums;
}
.timeline-text {
  color: var(--text);
  overflow-wrap: anywhere;
}

.post-column { display: flex; flex-direction: column; gap: 16px; min-width: 0; }

/* ---------- X-style post ---------- */
.xpost {
  background: var(--layer);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.xpost-head { display: flex; gap: 6px; align-items: baseline; font-size: 15px; }
.xpost-name { font-weight: 700; color: var(--text); }
.xpost-handle, .xpost-time { color: var(--text-secondary); }
.xpost-time::before { content: "· "; }
.xpost-text {
  font-size: 15px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}
.xpost-media { display: flex; flex-direction: column; gap: 8px; }
.xpost-photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  aspect-ratio: 16 / 9;
}
.xpost-photos--1 { grid-template-columns: 1fr; }
.xpost-photos--3 > :first-child { grid-row: span 2; }
.xpost-tile {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--field);
  color: var(--text-secondary);
  font-size: 12px;
}
.xpost-tile svg { width: 32px; height: 32px; }
.xpost-tile--video { aspect-ratio: 16 / 9; background: var(--inverse-bg); color: var(--inverse-text); }
.xpost-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 16px;
  border: 1px solid var(--border-subtle);
  font-size: 13px;
}
.xpost-link-domain { color: var(--text-secondary); font-size: 12px; }
.xpost-limited { font-size: 12px; color: var(--support-error); }
.xpost-actions {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
  padding-top: 4px;
}
.xpost-action {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.xpost-action:last-child { justify-content: flex-end; }
.xpost-action svg, .xpost-tile svg { flex: none; }
.xpost-action svg { width: 18px; height: 18px; }
.xpost svg path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.xpost svg path.filled { fill: currentColor; }

.post-card {
  background: var(--layer);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.post-score-row { display: flex; align-items: baseline; gap: 8px; }
.post-score-row .post-score-value { font-size: 32px; font-weight: 300; }

#sparkline {
  width: 100%;
  height: 60px;
  background: var(--field);
}
#sparkPath {
  fill: none;
  stroke: var(--interactive);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
}
#sparkZero {
  stroke: var(--border-strong);
  stroke-width: 1;
  stroke-dasharray: 4 4;
  vector-effect: non-scaling-stroke;
}

.post-head {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 12px;
  margin-bottom: 6px;
}
.post-author { font-weight: 600; color: var(--text); }
.post-meta { color: var(--text-secondary); }
.post-score-value { font-size: 16px; font-weight: 600; }
.post-score-value--neg { color: var(--support-error); }
.post-score-label { display: block; font-size: 11px; color: var(--text-secondary); }

/* score composition bar */
.bar {
  display: flex;
  height: 8px;
  background: var(--field);
  overflow: hidden;
}
.bar-seg { height: 100%; transition: width 360ms ease; }
.bar-seg--pos { background: var(--interactive); }
.bar-seg--neg { background: var(--support-error); }

.post-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}
.post-actions .neg { color: var(--support-error); }

/* ---------- weights page ---------- */
.weights-layout { display: flex; flex-direction: column; gap: 24px; }
.weights-group { background: var(--layer); }
.weights-group h2 {
  font-size: 14px;
  font-weight: 600;
  padding: 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.wtable { width: 100%; border-collapse: collapse; }
.wtable th {
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  background: var(--layer-accent);
  padding: 8px 16px;
}
.wtable th:last-child, .wtable td:last-child { text-align: right; }
.wtable td {
  padding: 8px 16px;
  border-top: 1px solid var(--border-subtle);
  font-variant-numeric: tabular-nums;
}
.wtable td.num { text-align: right; white-space: nowrap; }
.wbar-cell { width: 45%; }
.wbar { height: 8px; background: var(--field); position: relative; }
.wbar-fill { height: 100%; }
.wbar-fill--pos { background: var(--interactive); }
.wbar-fill--neg { background: var(--support-error); }
.wnote {
  padding: 12px 16px;
  font-size: 12px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
}