/* === RationalRewards Paper — Scholarly Kineticism Design System === */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #00d4aa;
  --primary-dim: #28dfb5;
  --primary-container: #005643;
  --accent: #7c3aed;
  --secondary: #d2bbff;
  --secondary-container: #6001d1;
  --surface: #121222;
  --surface-container: #1e1e2f;
  --surface-container-high: #29283a;
  --surface-container-highest: #333345;
  --surface-container-low: #1a1a2b;
  --surface-container-lowest: #0c0c1d;
  --on-surface: #e3e0f8;
  --on-surface-variant: #bacac2;
  --outline-variant: #3b4a44;
  --error: #ffb4ab;
  --content-max: 1100px;
  --content-narrow: 800px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Manrope', 'Segoe UI', system-ui, sans-serif;
  background: var(--surface);
  color: var(--on-surface);
  line-height: 1.7;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 600;
  line-height: 1.25;
  color: var(--on-surface);
}

h1 { font-size: 3rem; margin-bottom: 1.5rem; }
h2 { font-size: 2rem; margin-bottom: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
h4 { font-size: 1.25rem; margin-bottom: 0.75rem; }

p { margin-bottom: 1.25rem; }
p:last-child { margin-bottom: 0; }

.mono { font-family: 'JetBrains Mono', 'Fira Code', monospace; }

/* --- Layout --- */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: var(--content-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

.section-dark { background: var(--surface); }
.section-alt { background: var(--surface-container-low); }
.section-container { background: var(--surface-container); }

/* --- Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* --- Hero Section --- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 0;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(18,18,34,0.92) 0%, rgba(18,18,34,0.88) 40%, rgba(26,26,62,0.92) 100%);
  z-index: 1;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.06;
  z-index: 1;
  animation: orb-drift 60s ease-in-out infinite alternate;
}

.hero-orb-1 {
  width: 600px; height: 600px;
  background: var(--primary);
  top: -200px; right: -100px;
}

.hero-orb-2 {
  width: 500px; height: 500px;
  background: var(--accent);
  bottom: -150px; left: -50px;
}

@keyframes orb-drift {
  0% { transform: translate(0, 0); }
  50% { transform: translate(40px, -30px); }
  100% { transform: translate(-20px, 20px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
  padding: 120px 24px 80px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: rgba(0,212,170,0.15);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  color: #fff;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero-authors {
  color: var(--on-surface-variant);
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.hero-affiliations {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.affiliation-chip {
  display: inline-block;
  background: rgba(255,255,255,0.08);
  color: var(--on-surface-variant);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 100px;
}

.hero-date {
  color: var(--on-surface-variant);
  font-size: 0.85rem;
  opacity: 0.7;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dim));
  color: #00382b;
}

.btn-primary:hover {
  box-shadow: 0 0 24px rgba(0,212,170,0.25);
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(0,212,170,0.25);
  color: var(--primary);
}

.btn-ghost:hover {
  background: rgba(0,212,170,0.08);
  text-decoration: none;
}

/* --- Cards --- */
.card {
  background: rgba(51,51,69,0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(59,74,68,0.15);
  border-radius: 16px;
  padding: 32px;
  transition: box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: 0 0 32px rgba(0,212,170,0.08);
}

.card-gradient-top {
  border-top: 2px solid;
  border-image: linear-gradient(90deg, var(--primary), var(--accent)) 1;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card-grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
}

.card-grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.card-icon-primary { background: rgba(0,212,170,0.15); }
.card-icon-secondary { background: rgba(124,58,237,0.15); }
.card-icon-accent { background: rgba(210,187,255,0.15); }

.card h3 { font-size: 1.2rem; margin-bottom: 0.75rem; }
.card p { color: var(--on-surface-variant); font-size: 0.95rem; }

/* --- Metric Cards --- */
.metric-card {
  text-align: center;
  padding: 40px 24px;
}

.metric-number {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
  font-family: 'Manrope', sans-serif;
}

.metric-label {
  font-size: 1rem;
  color: var(--on-surface);
  font-weight: 600;
  margin-bottom: 4px;
}

.metric-sublabel {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
}

/* --- Callout --- */
.callout {
  background: var(--surface-container-high);
  border-left: 3px solid var(--primary);
  border-radius: 0 12px 12px 0;
  padding: 24px 28px;
  margin: 32px 0;
}

.callout-secondary {
  border-left-color: var(--secondary);
}

.callout h4 {
  color: var(--primary);
  margin-bottom: 0.75rem;
  font-family: 'Manrope', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.callout-secondary h4 { color: var(--secondary); }

.callout p { color: var(--on-surface-variant); margin-bottom: 0; }

/* --- Figures --- */
.figure-card {
  background: var(--surface-container-high);
  border-radius: 12px;
  padding: 16px;
  margin: 32px 0;
  overflow: hidden;
}

.figure-card img {
  border-radius: 8px;
  width: 100%;
}

.figure-card figcaption {
  color: var(--on-surface-variant);
  font-size: 0.88rem;
  padding: 12px 4px 4px;
  line-height: 1.5;
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th {
  background: var(--surface-container-high);
  color: var(--on-surface);
  font-weight: 600;
  padding: 12px 16px;
  text-align: left;
  white-space: nowrap;
}

td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(59,74,68,0.2);
  color: var(--on-surface-variant);
}

tr:hover td { background: rgba(0,212,170,0.03); }

/* --- Phase Cards --- */
.phase-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.3;
  font-family: 'Manrope', sans-serif;
  margin-bottom: 8px;
}

/* --- Tag Badges --- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-block;
  background: var(--surface-container-high);
  color: var(--on-surface-variant);
  font-size: 0.82rem;
  padding: 6px 14px;
  border-radius: 100px;
  transition: background 0.2s, color 0.2s;
}

.chip:hover {
  background: var(--secondary-container);
  color: var(--secondary);
}

/* --- Accordion / Details --- */
details {
  background: var(--surface-container);
  border-radius: 12px;
  padding: 0;
  margin: 16px 0;
}

details summary {
  cursor: pointer;
  padding: 16px 24px;
  font-weight: 600;
  color: var(--on-surface);
  font-size: 1rem;
  list-style: none;
}

details summary::-webkit-details-marker { display: none; }

details summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 8px;
  transition: transform 0.2s;
}

details[open] summary::before { transform: rotate(90deg); }

details .refs-content {
  padding: 0 24px 16px;
}

details ol {
  padding-left: 24px;
  color: var(--on-surface-variant);
  font-size: 0.82rem;
  line-height: 1.6;
}

details ol li { margin-bottom: 4px; }

/* --- Flecto Explanation UI --- */
.flecto-note,
.flecto-callout,
.flecto-card,
.flecto-panel {
  position: relative;
  margin: 24px 0;
  border-radius: 12px;
  overflow: hidden;
}

.flecto-note::before,
.flecto-callout::before,
.flecto-card::before,
.flecto-panel::before {
  content: '\1F916 AI explanation';
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #60a5fa;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.5em;
}

.flecto-note {
  background: var(--surface-container-high);
  border-left: 3px solid #60a5fa;
  padding: 16px 20px;
  font-size: 0.92rem;
  color: var(--on-surface-variant);
}

.flecto-callout {
  background: rgba(96,165,250,0.08);
  border: 1px solid rgba(96,165,250,0.2);
  padding: 20px 24px;
  color: var(--on-surface-variant);
}

.flecto-card {
  background: var(--surface-container-highest);
  border: 1px solid rgba(96,165,250,0.15);
  padding: 24px 28px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.flecto-card h4 { color: var(--on-surface); margin-bottom: 0.5rem; }
.flecto-card p { color: var(--on-surface-variant); }
.flecto-card ul { color: var(--on-surface-variant); padding-left: 20px; margin-top: 0.5rem; }
.flecto-card ul li { margin-bottom: 0.25rem; }

.flecto-panel {
  background: linear-gradient(135deg, var(--surface-container), var(--surface-container-high));
  border: 1px solid rgba(96,165,250,0.12);
  padding: 28px 32px;
}

.flecto-panel h4 { color: var(--primary); margin-bottom: 0.75rem; }
.flecto-panel p { color: var(--on-surface-variant); }

/* --- Section Title Badge --- */
.section-label {
  display: inline-block;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

/* --- Bullet List --- */
ul.feature-list {
  list-style: none;
  padding: 0;
}

ul.feature-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  color: var(--on-surface-variant);
}

ul.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.6;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  section { padding: 48px 0; }
  .hero-content { padding: 80px 16px 60px; }
  .card { padding: 24px; }
  .card-grid { grid-template-columns: 1fr; }
  .card-grid-2 { grid-template-columns: 1fr; }
  .card-grid-4 { grid-template-columns: 1fr 1fr; }
  .metric-number { font-size: 2.5rem; }
  .hero-affiliations { gap: 8px; }
}

@media (max-width: 480px) {
  .card-grid-4 { grid-template-columns: 1fr; }
}