:root {
  --paper-bg: #fdfbf7;
  --paper-text: #1a1a1a;
  --paper-accent: #8b2500;
  --paper-link: #1a5276;
  --paper-border: #d5cec0;
  --paper-caption: #555;
  --paper-heading: #111;
  --sim-bg: #f5f0e8;
  --sim-border: #c4b99a;
  --arxiv-red: #b31b1b;
  --dash-dark: #1a0a02;
  --dash-gold: #D4A84B;
  --dash-shell: #3E1C0A;
  --dash-cream: #FFF8E7;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: #e8e0d4;
  font-family: 'Newsreader', 'Times New Roman', serif;
  color: var(--paper-text);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(139, 37, 0, 0.15);
}

/* ===== ARXIV TOP BAR ===== */
.arxiv-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--arxiv-red);
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.arxiv-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.arxiv-logo {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.5px;
}

.arxiv-id {
  opacity: 0.8;
  font-size: 12px;
}

.arxiv-date {
  opacity: 0.6;
  font-size: 12px;
}

.arxiv-right {
  display: flex;
  gap: 16px;
  align-items: center;
}

.arxiv-right a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-size: 12px;
  transition: color 0.2s;
}

.arxiv-right a:hover {
  color: #fff;
}

.arxiv-remix {
  background: rgba(255,255,255,0.15);
  padding: 4px 12px;
  border-radius: 4px;
}

.arxiv-remix:hover {
  background: rgba(255,255,255,0.25) !important;
}

/* ===== PAPER CONTAINER ===== */
.paper-container {
  max-width: 850px;
  margin: 0 auto;
  background: var(--paper-bg);
  box-shadow: 0 0 40px rgba(0,0,0,0.12);
  min-height: 100vh;
}

/* ===== HEADER ===== */
.paper-header {
  padding: 60px 60px 40px;
  text-align: center;
  border-bottom: 1px solid var(--paper-border);
}

.paper-title {
  font-family: 'Newsreader', serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper-heading);
  margin-bottom: 28px;
  letter-spacing: -0.3px;
}

.authors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin-bottom: 16px;
}

.author-name {
  font-size: 15px;
  font-weight: 500;
}

.affiliations {
  font-size: 12.5px;
  color: var(--paper-caption);
  line-height: 1.6;
  margin-bottom: 12px;
}

.affiliations p {
  margin-bottom: 2px;
}

.corresponding {
  font-style: italic;
  margin-top: 6px !important;
}

.submission-info {
  font-size: 12px;
  color: var(--paper-caption);
  font-style: italic;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--paper-border);
}

/* ===== ABSTRACT ===== */
.abstract-section {
  padding: 32px 60px;
  border-bottom: 1px solid var(--paper-border);
}

.abstract-section h2 {
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--paper-heading);
  margin-bottom: 12px;
}

.abstract-text {
  font-size: 14.5px;
  line-height: 1.65;
  text-align: justify;
  hyphens: auto;
}

.keywords {
  margin-top: 16px;
  font-size: 13px;
  color: var(--paper-caption);
  line-height: 1.5;
}

/* ===== PAPER BODY ===== */
.paper-body {
  padding: 0 60px 40px;
  column-count: 2;
  column-gap: 32px;
  column-rule: 1px solid #e0d8cc;
}

.paper-body > section {
  break-inside: avoid-column;
  margin-top: 28px;
}

.paper-body h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-heading);
  margin-bottom: 10px;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--paper-accent);
  column-span: all;
  break-after: avoid;
}

.paper-body h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-heading);
  margin-top: 18px;
  margin-bottom: 8px;
  break-after: avoid;
}

.sec-num {
  color: var(--paper-accent);
  margin-right: 6px;
}

.paper-body p {
  text-align: justify;
  hyphens: auto;
  margin-bottom: 10px;
  font-size: 14.5px;
}

.paper-body a {
  color: var(--paper-link);
  text-decoration: none;
}

.paper-body a:hover {
  text-decoration: underline;
}

/* ===== FIGURES ===== */
.figure-full {
  column-span: all;
  margin: 24px 0;
  break-inside: avoid;
}

.figure-full img {
  width: 100%;
  height: auto;
  border: 1px solid var(--paper-border);
  border-radius: 2px;
  display: block;
  background: #eee;
  min-height: 200px;
}

figcaption {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--paper-caption);
  margin-top: 8px;
  padding: 0 8px;
}

/* ===== TABLES ===== */
.table-container {
  column-span: all;
  margin: 20px 0;
  break-inside: avoid;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.4;
  margin-top: 4px;
}

.data-table caption {
  text-align: left;
  font-size: 12.5px;
  color: var(--paper-caption);
  margin-bottom: 6px;
  caption-side: top;
}

.data-table thead {
  border-bottom: 2px solid var(--paper-heading);
}

.data-table th {
  padding: 6px 10px;
  text-align: left;
  font-weight: 600;
  font-size: 12.5px;
  color: var(--paper-heading);
  background: rgba(0,0,0,0.03);
}

.data-table td {
  padding: 5px 10px;
  border-bottom: 1px solid #e8e0d4;
}

.data-table tbody tr:hover {
  background: rgba(139,37,0,0.03);
}

/* ===== EQUATIONS ===== */
.equation {
  column-span: all;
  margin: 16px 0;
  text-align: center;
  font-size: 15px;
  overflow-x: auto;
  break-inside: avoid;
}

.eq-caption {
  font-size: 13.5px;
  color: var(--paper-caption);
  text-align: left;
}

/* ===== INTERACTIVE SIMULATIONS ===== */
.simulation-container {
  column-span: all;
  background: var(--sim-bg);
  border: 1px solid var(--sim-border);
  border-radius: 4px;
  padding: 20px;
  margin: 24px 0;
  break-inside: avoid;
}

.sim-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--paper-accent);
  margin-bottom: 6px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.3px;
}

.sim-desc {
  font-size: 13px;
  color: var(--paper-caption);
  margin-bottom: 16px;
  line-height: 1.5;
}

.sim-content {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.sim-content canvas {
  border: 1px solid var(--sim-border);
  border-radius: 3px;
  background: #fff;
  max-width: 100%;
  height: auto;
}

.sim-controls {
  flex: 0 0 200px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sim-controls label {
  font-size: 12px;
  font-weight: 600;
  color: var(--paper-caption);
  font-family: 'JetBrains Mono', monospace;
}

.sim-controls input[type="range"] {
  width: 100%;
  accent-color: var(--paper-accent);
  cursor: pointer;
}

.sim-btn {
  padding: 8px 16px;
  background: var(--paper-accent);
  color: #fff;
  border: none;
  border-radius: 3px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.sim-btn:hover {
  background: #a02000;
}

.sim-readouts {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.readout {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 4px 0;
  border-bottom: 1px solid var(--sim-border);
}

.readout-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--paper-caption);
}

.readout-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 500;
  color: var(--paper-heading);
}

/* ===== DASHBOARD SIMULATION ===== */
.dashboard-sim-content {
  flex-direction: column !important;
}

.dash-panel {
  background: linear-gradient(135deg, #2a1005 0%, var(--dash-shell) 40%, #4a2010 100%);
  border-radius: 8px;
  padding: 24px;
  width: 100%;
  border: 2px solid rgba(212,168,75,0.3);
}

.dash-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.dash-gauge-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.dash-gauge-wrap canvas {
  border: none !important;
  background: transparent !important;
}

.dash-gauge-label {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--dash-gold);
  margin-top: 4px;
  font-family: 'JetBrains Mono', monospace;
}

.dash-meters {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 120px;
}

.mini-meter {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.mini-meter-label {
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(212,168,75,0.6);
  font-family: 'JetBrains Mono', monospace;
}

.mini-meter-bar-wrap {
  width: 120px;
  height: 14px;
  background: rgba(0,0,0,0.5);
  border-radius: 7px;
  border: 1px solid rgba(212,168,75,0.3);
  overflow: hidden;
}

.mini-meter-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--dash-gold), #8B6914);
  border-radius: 7px;
  transition: width 0.5s;
}

.mini-meter-bar.temp {
  background: #4A7C3F;
  transition: width 0.5s, background 0.5s;
}

.mini-meter-bar.coolant {
  background: rgba(180,220,255,0.4);
}

.dash-controls-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.sim-dash-btn {
  padding: 8px 18px;
  border: 2px solid rgba(212,168,75,0.4);
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.3s;
  color: var(--dash-cream);
  background: rgba(62,28,10,0.85);
}

.sim-dash-btn:hover {
  background: rgba(212,168,75,0.3);
  border-color: var(--dash-gold);
}

.sim-dash-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.sim-dash-btn.active {
  border-color: #4A7C3F;
  box-shadow: 0 0 16px rgba(74,124,63,0.4);
}

.sim-dash-btn.driving-active {
  border-color: #c0392b;
  box-shadow: 0 0 16px rgba(192,57,43,0.3);
}

.dash-status {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: rgba(212,168,75,0.6);
  letter-spacing: 1px;
}

/* ===== REFERENCES ===== */
.references-list {
  font-size: 13px;
  line-height: 1.6;
  padding-left: 24px;
  column-span: all;
}

.references-list li {
  margin-bottom: 6px;
  color: var(--paper-caption);
  break-inside: avoid;
}

.references-list em {
  color: var(--paper-text);
}

/* ===== FOOTER ===== */
.paper-footer {
  padding: 24px 60px;
  border-top: 2px solid var(--paper-border);
  text-align: center;
  font-size: 12px;
  color: var(--paper-caption);
  background: rgba(0,0,0,0.02);
}

.paper-footer-link {
  margin-top: 8px;
}

.paper-footer a {
  color: var(--paper-accent);
  text-decoration: none;
}

.paper-footer a:hover {
  text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .paper-container {
    max-width: 100%;
  }
  
  .paper-header,
  .abstract-section,
  .paper-footer {
    padding-left: 24px;
    padding-right: 24px;
  }
  
  .paper-body {
    padding: 0 24px 32px;
    column-count: 1;
  }
  
  .paper-title {
    font-size: 22px;
  }
  
  .sim-content {
    flex-direction: column;
  }
  
  .sim-controls {
    flex: none;
    width: 100%;
  }
  
  .sim-content canvas {
    width: 100%;
  }
  
  .dash-row {
    flex-direction: column;
  }
}

@media (max-width: 600px) {
  .arxiv-bar {
    flex-direction: column;
    gap: 6px;
    padding: 6px 12px;
    font-size: 11px;
  }
  
  .arxiv-right {
    gap: 8px;
  }
  
  .paper-header {
    padding: 32px 16px 24px;
  }
  
  .paper-title {
    font-size: 19px;
  }
  
  .authors {
    gap: 2px 12px;
  }
  
  .author-name {
    font-size: 13px;
  }
  
  .affiliations {
    font-size: 11px;
  }
  
  .abstract-section {
    padding: 20px 16px;
  }
  
  .paper-body {
    padding: 0 16px 24px;
    column-count: 1;
  }
  
  .simulation-container {
    padding: 12px;
  }
  
  .dash-controls-row {
    gap: 8px;
  }
  
  .paper-footer {
    padding: 16px;
  }
}

/* ===== KaTeX overrides ===== */
.katex-display {
  margin: 0;
  padding: 0;
}

/* ===== Print ===== */
@media print {
  .arxiv-bar { display: none; }
  .simulation-container { break-inside: avoid; }
  body { background: #fff; }
  .paper-container { box-shadow: none; }
}