/* === RESET & BASE === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter',sans-serif;background:#0f0d1a;color:#e2e8f0;line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:#818cf8;text-decoration:none;transition:color .2s}
a:hover{color:#a5b4fc}

/* === TYPOGRAPHY === */
h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;color:#f1f5f9;line-height:1.2}
h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:700;letter-spacing:-0.02em}
h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:600;margin-bottom:1.25rem;letter-spacing:-0.01em}
h3{font-size:1.35rem;font-weight:600;margin-bottom:0.75rem}
h4{font-size:1.1rem;font-weight:600;margin-bottom:0.5rem}
p{margin-bottom:1rem}
code{font-family:'IBM Plex Mono',monospace;font-size:0.875em;background:rgba(99,102,241,0.12);padding:0.15em 0.4em;border-radius:4px}

/* === LAYOUT === */
.container{max-width:900px;margin:0 auto;padding:0 1.5rem}
.content-section{padding:4rem 0}
.alt-bg{background:#1a1730}

/* === HERO === */
.hero-section{position:relative;min-height:80vh;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:5rem 1.5rem 4rem}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,13,26,0.5) 0%,rgba(15,13,26,0.85) 60%,#0f0d1a 100%);z-index:1}
.hero-content{position:relative;z-index:2;text-align:center;max-width:850px}
.hero-badge{margin-bottom:1.5rem}
.hero-badge span{display:inline-block;padding:0.35em 1em;border-radius:999px;font-size:0.8rem;font-weight:600;text-transform:uppercase;letter-spacing:0.08em;background:rgba(99,102,241,0.2);color:#a5b4fc;border:1px solid rgba(99,102,241,0.3)}
.hero-subtitle{font-size:1.15rem;color:#94a3b8;margin-top:1rem;max-width:700px;margin-left:auto;margin-right:auto}
.hero-authors{margin-top:1.5rem;display:flex;flex-wrap:wrap;gap:0.4rem;justify-content:center}
.author-chip{display:inline-block;padding:0.2em 0.6em;border-radius:999px;font-size:0.75rem;background:rgba(99,102,241,0.1);color:#94a3b8;border:1px solid rgba(99,102,241,0.15)}
.hero-affiliations{font-size:0.8rem;color:#64748b;margin-top:0.75rem}
.hero-actions{margin-top:2rem;display:flex;gap:0.75rem;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:0.5rem;padding:0.7em 1.6em;border-radius:8px;font-size:0.95rem;font-weight:500;font-family:'Space Grotesk',sans-serif;transition:all .2s;text-decoration:none}
.btn-primary{background:#6366f1;color:#fff}
.btn-primary:hover{background:#4f46e5;color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:#818cf8;border:1px solid rgba(99,102,241,0.4)}
.btn-outline:hover{background:rgba(99,102,241,0.1);color:#a5b4fc}

/* === METRICS === */
.metrics-section{padding:3rem 0;background:#1a1730;border-top:1px solid rgba(99,102,241,0.1);border-bottom:1px solid rgba(99,102,241,0.1)}
.metrics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.metric-card{text-align:center;padding:2rem 1rem;background:rgba(99,102,241,0.06);border-radius:8px;border:1px solid rgba(99,102,241,0.12)}
.metric-number{display:block;font-family:'Space Grotesk',sans-serif;font-size:2.5rem;font-weight:700;line-height:1}
.metric-primary{color:#818cf8}
.metric-secondary{color:#22d3ee}
.metric-tertiary{color:#fbbf24}
.metric-label{display:block;font-size:0.9rem;color:#94a3b8;margin-top:0.5rem}
.metric-pills{margin-top:0.75rem;display:flex;gap:0.4rem;justify-content:center;flex-wrap:wrap}
.pill{padding:0.2em 0.7em;border-radius:999px;font-size:0.7rem;font-weight:600;text-transform:uppercase;letter-spacing:0.06em}
.pill-util{background:rgba(239,68,68,0.15);color:#fca5a5;border:1px solid rgba(239,68,68,0.25)}
.pill-interp{background:rgba(6,182,212,0.15);color:#67e8f9;border:1px solid rgba(6,182,212,0.25)}
.pill-mitig{background:rgba(245,158,11,0.15);color:#fcd34d;border:1px solid rgba(245,158,11,0.25)}

/* === ABSTRACT === */
.abstract-box{background:rgba(99,102,241,0.06);border-left:4px solid #6366f1;border-radius:0 8px 8px 0;padding:1.5rem 2rem}
.abstract-box p{font-size:1.05rem;margin-bottom:0}

/* === FIGURES === */
figure{margin:2rem 0;background:rgba(255,255,255,0.03);border-radius:8px;overflow:hidden;border:1px solid rgba(99,102,241,0.1)}
figure img{width:100%;display:block;padding:1rem;background:rgba(255,255,255,0.95);border-radius:8px 8px 0 0}
figcaption{padding:0.75rem 1rem;font-size:0.85rem;color:#94a3b8;line-height:1.5}
.figure-wide{overflow-x:auto}

/* === SECTION HEADER === */
.section-header{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;flex-wrap:wrap}
.section-header h2{margin-bottom:0}
.pillar-badge{padding:0.3em 0.9em;border-radius:999px;font-size:0.75rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;white-space:nowrap}
.pillar-util{background:rgba(239,68,68,0.15);color:#fca5a5;border:1px solid rgba(239,68,68,0.3)}
.pillar-interp{background:rgba(6,182,212,0.15);color:#67e8f9;border:1px solid rgba(6,182,212,0.3)}
.pillar-mitig{background:rgba(245,158,11,0.15);color:#fcd34d;border:1px solid rgba(245,158,11,0.3)}

/* === CARDS === */
.subsection-card{background:rgba(99,102,241,0.04);border:1px solid rgba(99,102,241,0.1);border-radius:8px;padding:2rem;margin-bottom:2rem}
.model-card{background:rgba(99,102,241,0.04);border:1px solid rgba(99,102,241,0.1);border-radius:8px;padding:1.5rem;margin-bottom:1.5rem}
.takeaway-box{background:rgba(99,102,241,0.08);border-radius:6px;padding:1rem 1.25rem;margin-bottom:1.25rem;border-left:3px solid #6366f1}
.takeaway-box p{margin-bottom:0;font-size:0.95rem}

/* === CONTRIBUTIONS === */
.contributions-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;margin-top:1.5rem}
.contribution-card{background:rgba(99,102,241,0.06);border:1px solid rgba(99,102,241,0.12);border-radius:8px;padding:1.5rem;position:relative}
.contribution-num{position:absolute;top:-0.5rem;left:1rem;background:#6366f1;color:#fff;width:1.75rem;height:1.75rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.8rem;font-weight:700;font-family:'Space Grotesk',sans-serif}
.contribution-card p{margin-top:0.5rem;margin-bottom:0;font-size:0.95rem}

/* === CALLOUT === */
.callout{background:rgba(99,102,241,0.06);border-radius:8px;padding:1.5rem;margin-bottom:1.5rem;border:1px solid rgba(99,102,241,0.15)}
.callout-definition{border-left:4px solid #06b6d4}
.callout h3{color:#22d3ee;font-size:1rem;text-transform:uppercase;letter-spacing:0.06em;margin-bottom:0.5rem}

/* === APPLICATIONS GRID === */
.apps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2rem}
.app-card{background:rgba(99,102,241,0.06);border:1px solid rgba(99,102,241,0.12);border-radius:8px;padding:1.25rem}
.app-card h4{color:#a5b4fc;font-size:0.95rem}
.app-card p{font-size:0.85rem;color:#94a3b8;margin-bottom:0}
.spotlight-card{background:rgba(99,102,241,0.06);border:1px solid rgba(99,102,241,0.15);border-radius:8px;padding:2rem;margin-bottom:2rem}

/* === CHALLENGES TWO-COL === */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:1.5rem}
.col-card{background:rgba(99,102,241,0.06);border:1px solid rgba(99,102,241,0.12);border-radius:8px;padding:1.5rem}
.col-card ul{list-style:none;padding:0}
.col-card li{padding:0.5rem 0;border-bottom:1px solid rgba(99,102,241,0.08);font-size:0.95rem}
.col-card li:last-child{border-bottom:none}

/* === CONCLUSION === */
.conclusion-box{background:rgba(99,102,241,0.06);border:1px solid rgba(99,102,241,0.15);border-radius:8px;padding:2rem;border-left:4px solid #6366f1}

/* === KEYWORDS === */
.keywords-row{display:flex;flex-wrap:wrap;gap:0.5rem}
.keyword-tag{padding:0.4em 1em;border-radius:999px;font-size:0.8rem;font-weight:500;background:rgba(99,102,241,0.1);color:#a5b4fc;border:1px solid rgba(99,102,241,0.2)}

/* === REFERENCES === */
details summary{cursor:pointer;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary h2::after{content:" +";font-size:0.8em;color:#64748b}
details[open] summary h2::after{content:" -"}
.references-list{padding-left:2rem;margin-top:1rem}
.references-list li{font-size:0.8rem;color:#94a3b8;padding:0.25rem 0;line-height:1.5}

/* === FLECTO EXPLANATION CLASSES === */
.flecto-note,.flecto-callout,.flecto-card,.flecto-panel{position:relative;margin:1.5rem 0;border-radius:8px}
.flecto-note::before,.flecto-callout::before,.flecto-card::before,.flecto-panel::before{content:"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:rgba(96,165,250,0.06);border-left:3px solid #60a5fa;padding:0.75rem 1rem;font-size:0.9rem}
.flecto-callout{background:rgba(96,165,250,0.08);border:1px solid rgba(96,165,250,0.2);padding:1.25rem 1.5rem}
.flecto-card{background:rgba(96,165,250,0.06);border:1px solid rgba(96,165,250,0.15);padding:1.5rem;box-shadow:0 2px 8px rgba(0,0,0,0.2)}
.flecto-card h4{color:#93c5fd;margin-bottom:0.5rem}
.flecto-panel{background:rgba(96,165,250,0.06);border:1px solid rgba(96,165,250,0.2);padding:2rem;box-shadow:0 4px 16px rgba(0,0,0,0.3)}
.flecto-panel h4{color:#93c5fd;font-size:1.1rem;margin-bottom:0.75rem}

/* === SCROLL REVEAL === */
.reveal{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease-out,transform 0.6s ease-out}
.reveal.visible{opacity:1;transform:translateY(0)}

/* === RESPONSIVE === */
@media(max-width:768px){
  .metrics-grid{grid-template-columns:1fr}
  .apps-grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .hero-section{min-height:auto;padding:3rem 1rem 2rem}
  .hero-authors{justify-content:center}
  .container{padding:0 1rem}
  .content-section{padding:2.5rem 0}
}

/* === REDUCED MOTION === */
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:0.01ms!important;animation-duration:0.01ms!important}
}