/* =========================================================
   Lotus Network Papers — Stylesheet v3
   ========================================================= */

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

:root {
  --bg:            #08080d;
  --bg-paper:      #0b0b12;
  --bg-paper-alt:  #090910;
  --bg-card:       #10101a;
  --bg-card-hover: #141420;
  --border:        #1a1a28;
  --border-bright: #252538;
  --accent:        #f0a500;
  --accent-dim:    rgba(240,165,0,0.12);
  --accent-glow:   rgba(240,165,0,0.06);
  --accent-zh:     #60a5fa;
  --accent-zh-dim: rgba(96,165,250,0.1);
  --text:          #e4eaf4;
  --text-muted:    #8892a8;
  --text-dim:      #484f60;
  --font:          'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:     'JetBrains Mono', 'SFMono-Regular', monospace;
  --font-serif:    'EB Garamond', Georgia, serif;
  --radius:        10px;
  --ease:          cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: var(--font); font-size: 15px; line-height: 1.6; }

/* ── Layout ── */
.container { max-width: 1040px; margin: 0 auto; padding: 0 28px; }

/* ── Reveal animations ── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.revealed { opacity: 1; transform: translateY(0); }
.reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal:nth-child(3) { transition-delay: 0.16s; }

/* ── Header ── */
header {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(8,8,13,0.9);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.header-inner {
  max-width: 1040px; margin: 0 auto; padding: 13px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 9px;
  font-size: 16px; font-weight: 600; color: var(--text);
  text-decoration: none; letter-spacing: -0.01em;
}
.logo-hex { width: 28px; height: 28px; flex-shrink: 0; }
.logo-img { width: 28px; height: 28px; flex-shrink: 0; border-radius: 4px; }
.header-nav { display: flex; align-items: center; gap: 4px; }
.header-nav > a:not(.telegram-btn) {
  color: var(--text-muted); text-decoration: none; font-size: 13px;
  font-weight: 500; padding: 6px 10px; border-radius: 7px;
  transition: color 0.15s, background 0.15s;
}
.header-nav > a:not(.telegram-btn):hover { color: var(--text); background: var(--bg-card); }
.telegram-btn {
  display: inline-flex; align-items: center; gap: 6px; margin-left: 8px;
  background: #229ed9; color: #fff; text-decoration: none;
  padding: 7px 15px; border-radius: 7px;
  font-size: 13px; font-weight: 600;
  transition: filter 0.15s;
}
.telegram-btn:hover { filter: brightness(1.15); }

/* ── Hero ── */
.hero {
  position: relative; overflow: hidden;
  padding: 110px 28px 90px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  min-height: 540px;
  display: flex; align-items: center; justify-content: center;
}
#hex-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none;
}
.hero-glow-top {
  position: absolute; top: -60px; left: 50%; transform: translateX(-50%);
  width: 700px; height: 420px;
  background: radial-gradient(ellipse at center, rgba(240,165,0,0.07) 0%, transparent 65%);
  pointer-events: none;
}
.hero-glow-bottom {
  position: absolute; bottom: -40px; left: 50%; transform: translateX(-50%);
  width: 500px; height: 200px;
  background: radial-gradient(ellipse at center, rgba(96,165,250,0.04) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 760px; width: 100%; }

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase;
  border: 1px solid rgba(240,165,0,0.25); border-radius: 20px;
  padding: 4px 13px; margin-bottom: 22px;
  background: rgba(240,165,0,0.05);
}
.hero-title {
  font-size: clamp(34px, 6.5vw, 60px); font-weight: 800;
  letter-spacing: -0.045em; line-height: 1.06;
  color: var(--text); margin-bottom: 22px;
}
.hero-accent {
  background: linear-gradient(135deg, #f0a500 0%, #ffd060 40%, #f0a500 100%);
  background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: shimmer 4s linear infinite;
}
@keyframes shimmer {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}
.hero-sub {
  font-size: 17px; color: var(--text-muted); line-height: 1.75;
  max-width: 580px; margin: 0 auto 36px;
}
.hero-actions {
  display: flex; gap: 12px; justify-content: center;
  flex-wrap: wrap; margin-bottom: 52px;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 8px;
  font-size: 14px; font-weight: 600; text-decoration: none;
  transition: all 0.15s var(--ease); white-space: nowrap;
}
.btn--primary { background: var(--accent); color: #000; }
.btn--primary:hover { filter: brightness(1.08); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(240,165,0,0.25); }
.btn--ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border-bright); }
.btn--ghost:hover { color: var(--text); border-color: var(--text-dim); background: var(--bg-card); transform: translateY(-1px); }
.btn--telegram { background: #229ed9; color: #fff; font-size: 16px; padding: 14px 30px; }
.btn--telegram:hover { filter: brightness(1.12); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(34,158,217,0.3); }

.hero-stats {
  display: inline-flex; align-items: stretch;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: rgba(16,16,26,0.8); overflow: hidden;
}
.stat { padding: 14px 28px; text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 700; color: var(--accent); letter-spacing: -0.03em; line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.1em; font-family: var(--font-mono); }
.stat-divider { width: 1px; background: var(--border); }

/* ── Argument ── */
.argument {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}
.argument .container { max-width: 760px; }
.argument-eyebrow {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 20px; text-align: center;
}
.argument-title {
  font-size: clamp(22px, 3.5vw, 34px); font-weight: 700;
  letter-spacing: -0.03em; color: var(--text);
  margin-bottom: 0; line-height: 1.2; text-align: center;
}
.argument-body {
  margin-top: 24px;
}
.argument-body > p {
  font-family: var(--font-serif); font-size: 17px;
  color: var(--text-muted); line-height: 1.85;
  margin-bottom: 18px;
}
.argument-body > p em { color: var(--text); font-style: italic; }
.argument-steps {
  margin: 36px 0 32px;
  display: flex; flex-direction: column; gap: 0;
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.argument-step {
  display: flex; gap: 0;
  border-bottom: 1px solid var(--border);
}
.argument-step:last-child { border-bottom: none; }
.step-num {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  color: var(--accent); padding: 24px 20px;
  background: rgba(240,165,0,0.04);
  border-right: 1px solid var(--border);
  min-width: 64px; display: flex; align-items: flex-start;
  padding-top: 26px;
}
.step-body { padding: 22px 24px; background: var(--bg-card); }
.step-body h3 {
  font-size: 15px; font-weight: 600; color: var(--text);
  margin-bottom: 8px; letter-spacing: -0.01em;
}
.step-body p {
  font-size: 14px; color: var(--text-muted); line-height: 1.7;
}
.argument-close {
  font-family: var(--font-serif) !important;
  font-size: 18px !important; font-style: italic;
  color: var(--text) !important;
  padding-left: 16px; border-left: 2px solid var(--accent);
  margin-bottom: 0 !important;
}

/* ── Triad ── */
.triad {
  padding: 60px 0 0;
  border-bottom: 1px solid var(--border);
}
.section-label {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  color: var(--text-dim); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 20px;
}
.triad-flow {
  display: flex; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
  overflow: hidden; border-bottom: none;
}
.triad-node {
  flex: 1; padding: 24px 22px;
  border-right: 1px solid var(--border);
  transition: background 0.2s;
}
.triad-node:last-child { border-right: none; }
.triad-node:hover { background: var(--bg-card-hover); }
.triad-num {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--accent); letter-spacing: 0.06em; margin-bottom: 8px;
}
.triad-name { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.triad-claim { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.triad-connector {
  flex-shrink: 0; display: flex; flex-direction: column;
  align-items: center; gap: 4px; padding: 0 6px;
}
.triad-connector svg { width: 56px; opacity: 0.8; }
.triad-connector span {
  font-size: 9px; color: var(--text-dim); letter-spacing: 0.08em;
  text-transform: uppercase; font-family: var(--font-mono); white-space: nowrap;
}
.triad-feedback-bar {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 10px 22px; margin-bottom: 0;
}
.feedback-line { flex: 1; height: 1px; background: rgba(240,165,0,0.2); }
.triad-feedback-bar span {
  font-size: 10px; color: var(--text-dim);
  font-family: var(--font-mono); letter-spacing: 0.06em;
  white-space: nowrap;
}

/* ── Papers ── */
.papers-section {}
.paper { padding: 72px 0; border-bottom: 1px solid var(--border); background: var(--bg-paper); }
.paper--alt { background: var(--bg-paper-alt); }

.paper-meta-row {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; flex-wrap: wrap; gap: 12px;
}
.paper-tag {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase;
}
.paper-dl-row { display: flex; gap: 8px; }
.dl-btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--accent); color: var(--accent);
  background: var(--accent-dim); text-decoration: none;
  padding: 6px 13px; border-radius: 6px;
  font-size: 11px; font-weight: 600; font-family: var(--font-mono);
  transition: all 0.15s; white-space: nowrap;
}
.dl-btn:hover { background: var(--accent); color: #000; transform: translateY(-1px); }
.dl-btn--zh { border-color: var(--accent-zh); color: var(--accent-zh); background: var(--accent-zh-dim); }
.dl-btn--zh:hover { background: var(--accent-zh); color: #000; }

.paper-title {
  font-size: clamp(20px, 3vw, 28px); font-weight: 700;
  letter-spacing: -0.025em; color: var(--text);
  line-height: 1.22; margin-bottom: 8px; max-width: 840px;
}
.paper-author {
  font-family: var(--font-serif); font-size: 14px;
  font-style: italic; color: var(--text-dim); margin-bottom: 20px;
}
.paper-claim {
  font-family: var(--font-serif); font-size: 17.5px;
  color: var(--text-muted); line-height: 1.75;
  max-width: 720px; margin: 0 0 40px;
  padding-left: 18px; border-left: 2px solid var(--accent);
  border-right: none; font-style: italic;
}

.results-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 13px; margin-bottom: 28px;
}
.result-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.result-card:hover {
  border-color: var(--border-bright);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.result-card--highlight {
  border-color: rgba(240,165,0,0.3);
  background: linear-gradient(150deg, rgba(240,165,0,0.05) 0%, var(--bg-card) 50%);
}
.result-card--highlight:hover { border-color: rgba(240,165,0,0.5); }
.result-label {
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 7px;
}
.result-title {
  font-size: 14px; font-weight: 600; color: var(--text);
  margin-bottom: 9px; line-height: 1.3;
}
.result-card p {
  font-size: 13px; color: var(--text-muted); line-height: 1.68; margin-bottom: 10px;
}
.result-math {
  background: rgba(240,165,0,0.05); border: 1px solid rgba(240,165,0,0.12);
  border-radius: 6px; padding: 9px 12px;
  font-size: 13px; color: var(--accent);
  overflow-x: auto; line-height: 1.6;
}
/* KaTeX color override inside math blocks */
.result-math .katex { color: var(--accent); }
.result-math .katex .base { color: inherit; }

/* ── Abstract ── */
.abstract-details {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; margin-bottom: 20px;
}
.abstract-details summary {
  padding: 13px 17px; cursor: pointer;
  font-size: 12px; font-weight: 500; color: var(--text-dim);
  font-family: var(--font-mono); letter-spacing: 0.04em;
  display: flex; align-items: center; gap: 8px;
  transition: color 0.15s, background 0.15s;
  list-style: none;
}
.abstract-details summary::-webkit-details-marker { display: none; }
.abstract-details summary::before {
  content: '▶'; font-size: 9px; color: var(--text-dim);
  transition: transform 0.2s; flex-shrink: 0;
}
.abstract-details[open] summary::before { transform: rotate(90deg); }
.abstract-details summary:hover { color: var(--text-muted); background: var(--bg-card-hover); }
.abstract-details p {
  padding: 20px 20px 22px; border-top: 1px solid var(--border);
  font-family: var(--font-serif); font-size: 16px;
  color: var(--text-muted); line-height: 1.85;
}

/* ── Citation ── */
.citation-block {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.citation-label {
  background: var(--bg-card); padding: 9px 15px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  color: var(--text-dim); letter-spacing: 0.08em; text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}
.citation-block code {
  display: block; padding: 13px 15px;
  font-family: var(--font-mono); font-size: 12px;
  color: var(--text-muted); line-height: 1.6;
  background: var(--bg); white-space: pre-wrap; word-break: break-all;
}

/* ── CTA ── */
.cta {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(ellipse 100% 200% at 50% 100%, rgba(240,165,0,0.04) 0%, transparent 60%);
}
.cta-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px; flex-wrap: wrap;
}
.cta-text h2 {
  font-size: 28px; font-weight: 700; letter-spacing: -0.025em;
  color: var(--text); margin-bottom: 10px;
}
.cta-text p {
  font-size: 15px; color: var(--text-muted); max-width: 520px; line-height: 1.75;
}

/* ── Footer ── */
footer { padding: 36px 0; }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px; margin-bottom: 20px;
}
.footer-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 600; color: var(--text-muted);
}
.footer-logo .logo-hex { width: 22px; height: 22px; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a {
  font-size: 13px; color: var(--text-dim); text-decoration: none;
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--text-muted); }
.footer-copy {
  font-size: 12px; color: var(--text-dim);
  border-top: 1px solid var(--border); padding-top: 16px;
}

/* ── Vietnamese / Hindi dl buttons ── */
.dl-btn--vi { border-color: #da251d; color: #da251d; background: rgba(218,37,29,0.08); }
.dl-btn--vi:hover { background: #da251d; color: #fff; }
.dl-btn--hi { border-color: #ff9933; color: #ff9933; background: rgba(255,153,51,0.08); }
.dl-btn--hi:hover { background: #ff9933; color: #000; }
.dl-btn--ar { border-color: #009736; color: #009736; background: rgba(0,151,54,0.08); }
.dl-btn--ar:hover { background: #009736; color: #fff; }

/* ── Patreon button ── */
.btn--patreon {
  background: #ff424d; color: #fff; font-size: 15px; padding: 13px 26px;
}
.btn--patreon:hover { filter: brightness(1.1); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,66,77,0.3); }
.cta-buttons { display: flex; gap: 14px; flex-wrap: wrap; }

/* ── Lotus story section ── */
.lotus-story {
  padding: 72px 0;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(240,165,0,0.03) 0%, transparent 50%);
}
.lotus-story .container { max-width: 760px; }
.lotus-inner {
  display: flex; gap: 40px; align-items: flex-start;
}
.lotus-symbol {
  font-size: 72px; line-height: 1; flex-shrink: 0;
  filter: drop-shadow(0 0 20px rgba(240,165,0,0.3));
}
.lotus-title {
  font-size: clamp(20px, 3vw, 28px); font-weight: 700;
  letter-spacing: -0.02em; color: var(--text);
  margin-bottom: 16px;
}
.lotus-text > p {
  font-family: var(--font-serif); font-size: 16.5px;
  color: var(--text-muted); line-height: 1.85;
  margin-bottom: 14px; max-width: 640px;
}
.lotus-text > p em { color: var(--text); font-style: italic; }
.lotus-langs {
  display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px;
}
.lang-badge {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 20px; padding: 5px 13px;
  font-size: 13px; color: var(--text-muted); font-weight: 500;
}
.lang-flag { font-size: 16px; }

/* ── KaTeX tweaks ── */
.katex-display { overflow-x: auto; padding: 4px 0; }
.triad-claim .katex,
.triad-claim .katex .mord { color: var(--text-muted) !important; }

/* ── Responsive ── */
@media (max-width: 760px) {
  .triad-flow { flex-direction: column; }
  .triad-node { border-right: none; border-bottom: 1px solid var(--border); }
  .triad-node:last-child { border-bottom: none; }
  .triad-connector { padding: 10px 0; flex-direction: row; }
  .triad-connector svg { transform: rotate(90deg); }
  .cta-inner { flex-direction: column; }
  .header-nav > a:not(.telegram-btn) { display: none; }
  .hero-stats { flex-wrap: wrap; }
  .stat-divider { display: none; }
  .stat { padding: 12px 18px; }
  .paper { padding: 52px 0; }
  .container { padding: 0 18px; }
  .hero { padding: 80px 18px 70px; }
  .results-grid { grid-template-columns: 1fr; }
}