/* Academic project page — styled after
   https://changseob-song.github.io/continual-online-personalization/ */

:root {
  --navy-950: #081120;
  --navy-900: #0f172a;
  --slate-800: #1f2937;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --white: #ffffff;
  --cyan: #22d3ee;
  --blue: #2563eb;
  --indigo: #6366f1;
  --emerald: #10b981;
  --shadow-sm: 0 10px 25px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 20px 45px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 28px 60px rgba(8, 17, 32, 0.18);
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --transition: all 0.25s ease;
  --pp-max: 64rem;
  --pp-narrow: 48rem;
  --pp-font: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body.project-page {
  margin: 0;
  min-height: 100vh;
  font-family: var(--pp-font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--slate-800);
  background:
    radial-gradient(circle at top left, rgba(34, 211, 238, 0.08), transparent 28%),
    linear-gradient(180deg, #fbfdff 0%, #f8fafc 100%);
  -webkit-font-smoothing: antialiased;
}

.pp-skip {
  position: absolute;
  left: -9999px;
  top: 0.75rem;
  padding: 0.5rem 1rem;
  background: var(--navy-900);
  color: #fff;
  z-index: 100;
  border-radius: 4px;
}

.pp-skip:focus {
  left: 0.75rem;
}

.pp-wrap {
  width: 100%;
  max-width: var(--pp-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.pp-wrap--narrow {
  max-width: var(--pp-narrow);
}

/* Hero */
.pp-hero {
  position: relative;
  color: var(--white);
  background:
    radial-gradient(circle at 15% 15%, rgba(34, 211, 238, 0.16), transparent 22%),
    radial-gradient(circle at 85% 20%, rgba(99, 102, 241, 0.18), transparent 25%),
    linear-gradient(135deg, var(--navy-950) 0%, var(--navy-900) 45%, #172554 100%);
  animation: ppFadeInUp 0.55s ease-out;
}

.pp-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 120px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0) 0%, rgba(248, 250, 252, 0.95) 100%);
  pointer-events: none;
}

.pp-hero__inner {
  position: relative;
  z-index: 1;
  padding: 1.25rem 1.5rem 5rem;
  text-align: center;
}

.pp-topnav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.pp-topnav a {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.pp-topnav a:hover {
  color: var(--cyan);
}

.pp-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.72);
  margin: 0 0 1.2rem;
}

.pp-title {
  font-weight: 800;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.08;
  color: var(--white);
  margin: 0 auto 1.5rem;
  max-width: 980px;
}

.pp-summary {
  max-width: 840px;
  margin: 0 auto 1.75rem;
  font-size: 1.12rem;
  color: rgba(255, 255, 255, 0.82);
}

.pp-authors {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin: 0 0 0.85rem;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.88);
}

.pp-author a {
  color: var(--cyan);
  text-decoration: none;
  font-weight: 600;
}

.pp-author a:hover {
  color: var(--white);
}

.pp-author-sep {
  opacity: 0.55;
}

.pp-equal {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
  margin: 0 0 0.75rem;
}

.pp-affiliations {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 2rem;
}

.pp-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.pp-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--white) !important;
  border: 1px solid rgba(255, 255, 255, 0.12);
  text-decoration: none !important;
  font-weight: 700;
  font-size: 0.92rem;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.pp-btn:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.28);
}

/* Sections */
.pp-section,
.pp-body > .pp-section {
  padding: 3.25rem 0;
  animation: ppFadeInUp 0.55s ease-out;
}

.pp-section--muted {
  background: rgba(241, 245, 249, 0.65);
}

.pp-section--lift {
  margin-top: -2.5rem;
  position: relative;
  z-index: 2;
}

.pp-section-heading {
  margin-bottom: 2rem;
  text-align: center;
}

.pp-section-title {
  font-weight: 800;
  font-size: clamp(1.45rem, 2.5vw, 1.85rem);
  color: var(--navy-900);
  margin: 0;
  line-height: 1.25;
}

.pp-section-title--left {
  text-align: left;
}

.pp-prose {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--navy-800, #1e293b);
  max-width: 42rem;
  margin: 0 auto;
}

.pp-prose p {
  margin: 0 0 1rem;
}

.pp-prose strong {
  font-weight: 700;
  color: var(--navy-900, #0f172a);
}

.pp-section-title .pp-title-light {
  font-weight: 400;
}

.pp-kicker {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--blue);
  margin: 0 0 0.55rem;
}

.pp-lead {
  text-align: center;
  color: var(--slate-700);
  max-width: 46rem;
  margin: 0 auto 1.5rem;
  font-size: 1.02rem;
}

.pp-pullquote {
  font-style: italic;
  font-weight: 600;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--navy-900);
  text-align: center;
  max-width: 46rem;
  margin: 0 auto;
  line-height: 1.45;
}

/* Cards / media */
.pp-card,
.pp-feature-card,
.pp-stat-card,
.pp-bibtex {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.pp-card {
  padding: 1rem;
}

.pp-card:hover,
.pp-feature-card:hover,
.pp-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pp-card video,
.pp-card img,
.pp-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius-md) - 8px);
}

.pp-card--narrow {
  max-width: 70%;
  margin-left: auto;
  margin-right: auto;
}

.pp-caption,
.pp-figure figcaption {
  margin: 1rem 0 0;
  color: var(--slate-500);
  font-size: 0.98rem;
  text-align: center;
  line-height: 1.55;
}

.pp-figure {
  margin: 0;
}

.pp-figure--narrow {
  max-width: 75%;
  margin-left: auto;
  margin-right: auto;
}

.pp-placeholder-box {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 12rem;
  border: 2px dashed var(--slate-300);
  border-radius: calc(var(--radius-md) - 8px);
  background: var(--slate-100);
  color: var(--slate-500);
  font-size: 0.95rem;
  text-align: center;
  padding: 1.5rem;
}

/* Feature grid */
.pp-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.pp-feature-card {
  height: 100%;
  padding: 1.6rem;
}

.pp-feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy-900);
  margin: 0 0 0.75rem;
}

.pp-feature-card p {
  margin: 0;
  color: var(--slate-700);
}

.pp-feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.14), rgba(34, 211, 238, 0.18));
  color: var(--blue);
  font-size: 1.2rem;
}

/* Method pair */
.pp-method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem;
}

.pp-method-col {
  text-align: center;
}

.pp-method-col h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy-900);
  margin: 0 0 1rem;
}

/* Stats */
/* Flex (not grid) so rows with fewer than --pp-stat-cols cards stay centered */
.pp-stats {
  --pp-stat-cols: 4;
  --pp-stat-gap: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--pp-stat-gap);
  margin-bottom: 2rem;
  width: 100%;
}

.pp-stat-card {
  flex: 0 0 calc((100% - (var(--pp-stat-cols) - 1) * var(--pp-stat-gap)) / var(--pp-stat-cols));
  min-width: 0;
  padding: 1.15rem 0.85rem;
  text-align: center;
}

.pp-stat-value {
  display: block;
  font-size: clamp(1.45rem, 2.2vw, 1.9rem);
  line-height: 1;
  font-weight: 800;
  color: var(--blue);
  margin-bottom: 0.4rem;
}

.pp-stat-label {
  display: block;
  color: var(--slate-600);
  font-size: 0.82rem;
  line-height: 1.35;
}

/* BibTeX */
.pp-bibtex-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.pp-bibtex {
  margin: 0;
  padding: 1.4rem;
  overflow-x: auto;
}

.pp-bibtex code {
  background: transparent;
  color: var(--navy-900);
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
  font-size: 0.88rem;
  white-space: pre;
}

.pp-copy-btn {
  background: var(--navy-900);
  color: var(--white);
  border: none;
  border-radius: 999px;
  padding: 0.8rem 1rem;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.pp-copy-btn:hover {
  transform: translateY(-2px);
  background: var(--blue);
}

.pp-copy-btn.is-copied {
  background: var(--emerald);
}

/* Footer */
.pp-footer {
  background: transparent;
  padding: 3rem 1.5rem 4rem;
}

.pp-footer p {
  margin: 0;
  text-align: center;
  color: var(--slate-500);
  font-size: 0.95rem;
  line-height: 1.7;
}

.pp-footer a {
  color: var(--blue);
}

/* Scroll top */
.pp-scroll-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 48px;
  height: 48px;
  background: var(--navy-900);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.pp-scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.pp-scroll-top:hover {
  transform: translateY(-2px);
  background: var(--blue);
}

.pp-btn:focus,
.pp-copy-btn:focus,
.pp-scroll-top:focus,
a:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

@keyframes ppFadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .pp-feature-grid,
  .pp-method-grid {
    grid-template-columns: 1fr;
  }

  .pp-stats {
    --pp-stat-cols: 2;
  }
}

@media (max-width: 640px) {
  .pp-stats {
    --pp-stat-cols: 1;
  }
}

@media (max-width: 768px) {
  .pp-hero__inner {
    padding: 1rem 1rem 4rem;
  }

  .pp-section--lift {
    margin-top: -1.5rem;
  }

  .pp-card--narrow,
  .pp-figure--narrow {
    max-width: 100%;
  }

  .pp-bibtex-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .pp-links {
    flex-direction: column;
    align-items: stretch;
  }

  .pp-btn {
    justify-content: center;
    width: 100%;
  }
}