/* =====================================================
   RealRestorer Paper Article — styles.css
   Palette: navy/blue academic with gold accents
   ===================================================== */

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

:root {
  --color-primary:      #1A2744;
  --color-secondary:    #2C5282;
  --color-accent:       #3182CE;
  --color-bg:           #F7F9FC;
  --color-surface:      #FFFFFF;
  --color-surface-alt:  #EBF4FF;
  --color-text:         #1A202C;
  --color-muted:        #718096;
  --color-line:         #CBD5E0;
  --color-gold:         #B7791F;
  --color-gold-bg:      #FFFBF0;
  --color-dark:         #1A2744;

  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;

  --shadow-sm: 0 1px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 2px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.14);

  --max-w:       1100px;
  --max-w-narrow: 740px;

  --font-sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
}
a:hover {
  color: var(--color-secondary);
}

sup {
  font-size: 0.7em;
  vertical-align: super;
  line-height: 0;
}

strong { font-weight: 700; }
em { font-style: italic; }

ol, ul {
  padding-left: 1.5em;
}

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

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

/* ---- Sections ---- */
.section {
  padding-block: 72px;
}

.section--white {
  background-color: var(--color-surface);
}

.section--alt {
  background-color: var(--color-bg);
}

.section--dark {
  background-color: var(--color-dark);
  color: #E2E8F0;
}

/* ---- Section Titles ---- */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 36px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-title--light {
  color: #E2E8F0;
}

.subsection-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 28px;
  margin-bottom: 12px;
}

.subsection-title--light {
  color: #BEE3F8;
}

/* ---- Hero ---- */
.hero {
  position: relative;
  background-color: var(--color-primary);
  overflow: hidden;
  padding-bottom: 0;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(26, 39, 68, 0.85) 0%,
    rgba(44, 82, 130, 0.75) 50%,
    rgba(26, 39, 68, 0.90) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
  padding-top: 72px;
  text-align: center;
}

.hero-arxiv {
  font-size: 0.8rem;
  color: rgba(178, 210, 255, 0.75);
  letter-spacing: 0.04em;
  margin-bottom: 20px;
  font-family: var(--font-mono);
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.025em;
  line-height: 1.15;
  max-width: 820px;
  margin-inline: auto;
  margin-bottom: 32px;
}

.hero-authors {
  margin-bottom: 28px;
}

.authors-line {
  font-size: 0.9rem;
  color: rgba(226, 232, 240, 0.9);
  line-height: 1.8;
}

.affiliations {
  font-size: 0.78rem;
  color: rgba(178, 210, 255, 0.7);
  font-style: italic;
  margin-top: 6px;
  line-height: 1.6;
}

.author-notes {
  font-size: 0.72rem;
  color: rgba(178, 210, 255, 0.55);
  margin-top: 6px;
}


/* ---- Hero Figure ---- */
.hero-figure {
  margin-top: 8px;
  text-align: center;
}

.hero-figure-img {
  width: 100%;
  max-height: 500px;
  object-fit: contain;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  margin-inline: auto;
}

.hero-figure figcaption {
  font-size: 0.8rem;
  color: rgba(178, 210, 255, 0.7);
  font-style: italic;
  padding: 14px 16px 28px;
  line-height: 1.5;
}

/* ---- Abstract ---- */
.abstract-text {
  border-left: 4px solid var(--color-accent);
  padding: 20px 24px;
  background: var(--color-surface-alt);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D3748;
  quotes: none;
}

/* ---- Cards ---- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 960px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px 24px;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card--contribution {
  border-top: 3px solid var(--color-accent);
}

.card-icon {
  margin-bottom: 16px;
  width: 48px;
  height: 48px;
}

.card-icon img {
  width: 48px;
  height: 48px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.card-body {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ---- Text blocks ---- */
.text-block {
  max-width: 820px;
}

.text-block p {
  margin-bottom: 14px;
  font-size: 1rem;
  line-height: 1.8;
}

.text-block--light p,
.text-block--light h3 {
  color: #E2E8F0;
}

.text-block--light p {
  color: rgba(226, 232, 240, 0.85);
}

/* ---- Figures ---- */
.figure-block {
  margin-block: 40px;
}

.figure-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
}

.figure-container {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px;
  overflow: hidden;
}

.figure-container img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.figure-container--compact img {
  max-height: 360px;
  object-fit: contain;
  margin-inline: auto;
}

.figure-container--tall img {
  max-height: 680px;
  object-fit: contain;
  margin-inline: auto;
}

.figure-container--table {
  overflow-x: auto;
}

.figure-container--table img {
  min-width: 600px;
  cursor: zoom-in;
}

.figure-block figcaption {
  font-size: 0.83rem;
  color: var(--color-muted);
  font-style: italic;
  padding-top: 10px;
  line-height: 1.55;
  text-align: center;
}

/* ---- Stats Banner ---- */
.stats-banner {
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin-block: 40px;
  color: white;
}

.stats-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: 16px 32px;
  flex: 1;
  min-width: 140px;
}

.stat-number {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--color-gold);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stat-number--plain {
  color: #90CDF4;
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: rgba(226, 232, 240, 0.7);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: rgba(255,255,255,0.15);
  align-self: center;
}

@media (max-width: 640px) {
  .stat-divider { display: none; }
  .stats-grid { flex-direction: column; gap: 8px; }
  .stat-item { padding: 10px 16px; }
}

.stats-note {
  text-align: center;
  margin-top: 20px;
  font-size: 0.82rem;
  color: rgba(226, 232, 240, 0.6);
  letter-spacing: 0.02em;
}

/* ---- Two-column layout ---- */
.two-col-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  margin-block: 40px;
}

@media (max-width: 768px) {
  .two-col-layout {
    grid-template-columns: 1fr;
  }
}

.two-col-figure figcaption {
  font-size: 0.82rem;
  color: var(--color-muted);
  font-style: italic;
  padding-top: 10px;
  line-height: 1.5;
  text-align: center;
}

/* ---- Benchmark features ---- */
.bench-features,
.metrics-list {
  margin-block: 16px;
  font-size: 0.97rem;
  line-height: 1.75;
}

.bench-features li,
.metrics-list li {
  margin-bottom: 8px;
}

/* ---- Formula block ---- */
.formula-block {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-block: 20px;
  text-align: center;
}

.formula {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.formula-note {
  font-size: 0.85rem;
  color: var(--color-muted);
  font-style: italic;
}

/* ---- Callout boxes ---- */
.callout {
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-block: 24px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.callout p {
  margin: 0;
}

.callout--gold {
  border-left: 4px solid var(--color-gold);
  background: var(--color-gold-bg);
  color: #5A3E10;
}

.callout--blue {
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface-alt);
  color: #1A3A5A;
}

/* ---- Results callout ---- */
.result-callout {
  position: relative;
  background: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  margin-bottom: 48px;
  max-width: 880px;
  margin-inline: auto;
  overflow: hidden;
}

.callout-quote {
  position: absolute;
  top: -8px;
  left: 20px;
  font-size: 6rem;
  font-weight: 900;
  color: rgba(255,255,255,0.06);
  line-height: 1;
  font-family: Georgia, serif;
  pointer-events: none;
}

.callout-text {
  font-size: 1.05rem;
  color: rgba(226, 232, 240, 0.9);
  line-height: 1.75;
  position: relative;
  z-index: 1;
}

.callout-stat {
  color: var(--color-gold);
  font-weight: 800;
  font-size: 1.1em;
}

.callout-stat--secondary {
  color: #90CDF4;
}

/* ---- Method steps ---- */
.method-steps {
  margin-block: 16px;
  font-size: 0.97rem;
  line-height: 1.8;
}

.method-steps li {
  margin-bottom: 12px;
}

/* ---- Ablation findings ---- */
.ablation-findings {
  margin-block: 16px;
  font-size: 0.97rem;
  line-height: 1.8;
}

.ablation-findings li {
  margin-bottom: 12px;
}

/* ---- Limitations ---- */
.limitations-text {
  font-size: 0.92rem;
  color: rgba(226, 232, 240, 0.65);
  font-style: italic;
}

/* ---- Footer ---- */
.footer {
  background: var(--color-primary);
  padding-block: 48px;
  color: rgba(226, 232, 240, 0.7);
}

.footer-citation {
  text-align: center;
}

.footer-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.footer-paper-title {
  font-size: 0.9rem;
  color: rgba(226, 232, 240, 0.8);
  max-width: 600px;
  margin-inline: auto;
  line-height: 1.5;
  margin-bottom: 8px;
}

.footer-authors {
  font-size: 0.8rem;
  color: rgba(178, 210, 255, 0.6);
  margin-bottom: 6px;
}

.footer-arxiv {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: rgba(178, 210, 255, 0.5);
  margin-bottom: 20px;
}


/* ---- Animation classes ---- */
.js-fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js-fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.js-fade-in-scale {
  opacity: 0;
  transform: scale(0.97) translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-fade-in-scale.is-visible {
  opacity: 1;
  transform: scale(1) translateY(0);
}

.js-slide-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js-slide-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger for card children */
.cards-grid .card:nth-child(1) { transition-delay: 0ms; }
.cards-grid .card:nth-child(2) { transition-delay: 100ms; }
.cards-grid .card:nth-child(3) { transition-delay: 200ms; }

/* ---- Responsive adjustments ---- */
@media (max-width: 768px) {
  .section {
    padding-block: 48px;
  }

  .hero-content {
    padding-top: 48px;
  }

  .hero-title {
    font-size: clamp(1.5rem, 6vw, 2rem);
  }

  .result-callout {
    padding: 24px 22px;
  }

  .stats-banner {
    padding: 28px 20px;
  }

  .two-col-layout {
    gap: 24px;
  }
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .js-fade-in,
  .js-fade-in-scale,
  .js-slide-left {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---- Print ---- */
@media print {
  .hero-bg { display: none; }
  .hero { background: white; }
  .hero-title, .hero-authors, .hero-arxiv { color: black; }
  .stats-banner, .result-callout, .footer, .section--dark {
    background: white;
    color: black;
    border: 1px solid #ccc;
  }
}

/* AI explanation labels */
.flecto-note::before,
.flecto-callout::before,
.flecto-card::before,
.flecto-panel::before {
  content: "🤖 AI explanation";
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #60a5fa;
  margin-bottom: 0.5em;
  opacity: 0.9;
}