:root {
    --bg: #fbfaf7;
    --surface: #ffffff;
    --text: #1a1f2e;
    --muted: #5a6478;
    --border: #e6e2d8;
    --accent: #2a6f6c;
    --accent-soft: #d8ede9;
    --accent-strong: #1f5552;
    --highlight: #f4ead4;
    --code-bg: #f2efe7;
    --shadow: 0 1px 2px rgba(20, 30, 40, 0.04), 0 4px 16px rgba(20, 30, 40, 0.06);
    --radius: 10px;
    --max-w: 1080px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", "Helvetica Neue", "Segoe UI", system-ui, -apple-system, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* ----------------- HERO ----------------- */
.hero {
    background:
        radial-gradient(60% 80% at 80% 0%, rgba(42, 111, 108, 0.10) 0%, transparent 60%),
        radial-gradient(50% 70% at 0% 100%, rgba(244, 234, 212, 0.6) 0%, transparent 60%),
        var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 56px 0 36px;
    text-align: center;
}

.eyebrow {
    display: inline-block;
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent-strong);
    background: var(--accent-soft);
    padding: 4px 12px;
    border-radius: 999px;
    margin-bottom: 18px;
    font-weight: 600;
}

h1.title {
    font-size: clamp(1.7rem, 3.4vw, 2.6rem);
    line-height: 1.2;
    margin: 0 0 6px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

h1.title .ours {
    color: var(--accent-strong);
    border-bottom: 3px solid var(--accent);
    padding-bottom: 1px;
}

.subtitle {
    font-size: 1.05rem;
    color: var(--muted);
    margin: 8px 0 28px;
}

.authors {
    margin-top: 18px;
    line-height: 1.9;
    font-size: 0.98rem;
}

.authors .author {
    margin: 0 6px;
    white-space: nowrap;
}

.authors sup {
    color: var(--accent-strong);
    font-weight: 600;
}

.affiliations {
    color: var(--muted);
    font-size: 0.92rem;
    margin-top: 12px;
}

.affiliations sup {
    color: var(--accent-strong);
    font-weight: 700;
}

.equal-contrib {
    color: var(--muted);
    font-size: 0.85rem;
    margin-top: 4px;
    font-style: italic;
}

/* ----------------- BUTTONS ----------------- */
.actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    background: var(--text);
    color: #fff;
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.92rem;
    border: 1px solid var(--text);
    transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.btn:hover {
    transform: translateY(-1px);
    background: var(--accent-strong);
    border-color: var(--accent-strong);
}

.btn.secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}

.btn.secondary:hover {
    background: var(--accent-soft);
    color: var(--accent-strong);
    border-color: var(--accent);
}

.btn .icon {
    font-size: 1rem;
    line-height: 1;
}

/* ----------------- SECTIONS ----------------- */
section {
    padding: 56px 0;
    border-bottom: 1px solid var(--border);
}

section:last-of-type {
    border-bottom: none;
}

h2.section-title {
    font-size: 1.55rem;
    font-weight: 700;
    margin: 0 0 24px;
    letter-spacing: -0.01em;
    position: relative;
    padding-left: 14px;
}

h2.section-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.45em;
    bottom: 0.4em;
    width: 4px;
    border-radius: 2px;
    background: var(--accent);
}

h3.subsection-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 32px 0 10px;
    color: var(--accent-strong);
}

p {
    margin: 0 0 14px;
    color: var(--text);
}

p.lead {
    font-size: 1.05rem;
    color: var(--text);
}

.abstract {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius);
    padding: 24px 28px;
    box-shadow: var(--shadow);
    text-align: justify;
}

.abstract p { margin: 0; }

/* ----------------- FIGURES ----------------- */
.figure {
    margin: 24px 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.figure-frame {
    width: 100%;
    background: #fff;
    display: block;
}

.figure-frame.tall { height: 640px; }
.figure-frame.medium { height: 460px; }
.figure-frame.short { height: 360px; }
.figure-frame.compact { height: 300px; }

.figure-img {
    display: block;
    width: calc(100% - 32px);
    height: auto;
    background: #fff;
    padding: 16px;
    margin: 0 auto;
    box-sizing: content-box;
}

@media (max-width: 720px) {
    .figure-img {
        width: calc(100% - 16px);
        padding: 8px;
    }
}

.figure-caption {
    padding: 14px 20px;
    font-size: 0.92rem;
    color: var(--muted);
    border-top: 1px solid var(--border);
    background: #fcfbf8;
}

.figure-caption strong {
    color: var(--text);
}

/* ----------------- TABLE ----------------- */
.table-wrap {
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 18px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    min-width: 720px;
}

th, td {
    padding: 11px 14px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

th {
    background: #f6f3ec;
    font-weight: 700;
    color: var(--text);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

td:first-child, th:first-child {
    text-align: left;
}

tr.ours-row {
    background: var(--accent-soft);
}

tr.ours-row td {
    color: var(--accent-strong);
}

tr.ours-row td:first-child {
    font-weight: 700;
}

td .delta-up {
    color: #2a7f4a;
    font-weight: 700;
    font-size: 0.82rem;
}

td .delta-down {
    color: #b94a48;
    font-weight: 700;
    font-size: 0.82rem;
}

caption {
    caption-side: top;
    padding: 14px 16px;
    font-size: 0.9rem;
    color: var(--muted);
    text-align: left;
    border-bottom: 1px solid var(--border);
    background: #fcfbf8;
}

/* ----------------- KEY POINTS ----------------- */
.key-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
    margin: 24px 0 12px;
}

.key-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    box-shadow: var(--shadow);
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.key-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.key-card .badge {
    display: inline-block;
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent-strong);
    background: var(--accent-soft);
    padding: 2px 8px;
    border-radius: 999px;
    margin-bottom: 8px;
    font-weight: 700;
}

.key-card h4 {
    margin: 0 0 6px;
    font-size: 1.02rem;
    font-weight: 700;
}

.key-card p {
    margin: 0;
    font-size: 0.92rem;
    color: var(--muted);
    line-height: 1.55;
}

/* ----------------- METHOD GRID ----------------- */
.method-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 28px 0 12px;
}

.method-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 22px 18px;
    box-shadow: var(--shadow);
    transition: transform 0.18s ease, border-color 0.18s ease;
}

.method-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.method-card .step {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 10px;
    box-shadow: 0 2px 6px rgba(42, 111, 108, 0.25);
}

.method-card h4 {
    margin: 0 0 8px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--accent-strong);
}

.method-card p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.6;
}

@media (max-width: 720px) {
    .method-grid {
        grid-template-columns: 1fr;
    }
}

/* ----------------- BIBTEX ----------------- */
.bibtex-wrap {
    position: relative;
}

.bibtex {
    background: var(--code-bg);
    color: var(--text);
    border-radius: var(--radius);
    padding: 18px 20px;
    padding-top: 44px;
    margin: 0;
    font-family: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
    font-size: 0.85rem;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-x: auto;
    border: 1px solid var(--border);
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 5px 12px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--muted);
    font-family: inherit;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.copy-btn:hover {
    color: var(--accent-strong);
    border-color: var(--accent);
}

.copy-btn.copied {
    color: var(--accent-strong);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* ----------------- FOOTER ----------------- */
footer {
    text-align: center;
    padding: 32px 16px 48px;
    color: var(--muted);
    font-size: 0.88rem;
    background: #f6f3ec;
    border-top: 1px solid var(--border);
}

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

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

/* ----------------- INLINE STYLES ----------------- */
code.inline {
    background: var(--code-bg);
    padding: 1px 6px;
    border-radius: 4px;
    font-family: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
    font-size: 0.88em;
    color: var(--accent-strong);
}

ul.tight {
    margin: 6px 0 14px;
    padding-left: 22px;
}

ul.tight li {
    margin-bottom: 6px;
}

a.inline-link {
    color: var(--accent-strong);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-soft);
}

a.inline-link:hover {
    border-bottom-color: var(--accent);
}

.tldr {
    background: var(--highlight);
    border-left: 4px solid #c89c3a;
    padding: 14px 20px;
    border-radius: var(--radius);
    margin: 18px 0 24px;
    font-size: 0.98rem;
}

.tldr strong { color: #7a5a18; }

#topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease, background 0.3s ease;
}

#topnav.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.10);
  background: rgba(255, 255, 255, 0.95);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 24px;
  max-width: 900px;
  width: 100%;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.02em;
  color: #1a1a1a;
  margin-right: 12px;
  white-space: nowrap;
  text-decoration: none;
}

.nav-logo span {
  color: #6A8D52;
}

.nav-divider {
  width: 1px;
  height: 20px;
  background: rgba(0,0,0,0.15);
  margin-right: 4px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-link {
  display: inline-block;
  padding: 5px 11px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 500;
  color: #555;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s, background 0.18s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 11px;
  right: 11px;
  height: 2px;
  border-radius: 1px;
  background: #6A8D52;
  transform: scaleX(0);
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1);
  transform-origin: center;
}

.nav-link:hover {
  color: #1a1a1a;
  background: rgba(0,0,0,0.05);
}

.nav-link.active {
  color: #6A8D52;
}

.nav-link.active::after {
  transform: scaleX(1);
}

/* Push body content below navbar */
body {
  padding-top: 52px;
}

/* ============================
   SCROLL-REVEAL ANIMATIONS
   ============================ */

/* Base: all animated elements start hidden */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

[data-reveal="left"] {
  transform: translateX(-32px);
}

[data-reveal="right"] {
  transform: translateX(32px);
}

[data-reveal="scale"] {
  transform: scale(0.94) translateY(16px);
}

[data-reveal="fade"] {
  transform: none;
}

/* When visible */
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* Stagger delay helpers */
[data-delay="1"] { transition-delay: 0.08s; }
[data-delay="2"] { transition-delay: 0.16s; }
[data-delay="3"] { transition-delay: 0.24s; }
[data-delay="4"] { transition-delay: 0.32s; }
[data-delay="5"] { transition-delay: 0.40s; }
[data-delay="6"] { transition-delay: 0.48s; }

/* Section title special entrance */
.section-title[data-reveal] {
  position: relative;
}

/* Table rows stagger */
tbody tr[data-reveal] {
  transition-delay: calc(var(--row-i, 0) * 0.045s);
}

/* Figure images: slight scale-in */
.figure-img[data-reveal] {
  transform: scale(0.97) translateY(18px);
}
.figure-img[data-reveal].is-visible {
  transform: none;
}

/* ----------------- RESPONSIVE ----------------- */
@media (max-width: 720px) {
    .hero { padding: 36px 0 28px; }
    section { padding: 40px 0; }
    .figure-frame.tall { height: 420px; }
    .figure-frame.medium { height: 320px; }
    .figure-frame.short { height: 260px; }
    .figure-frame.compact { height: 220px; }
    h1.title { font-size: 1.6rem; }
}