/* =========================================================
   Marvel Lab — Design Tokens
========================================================= */
:root{
  --navy: #223E5B;
  --navy-soft: #2E5077;
  --coral: #F69176;
  --coral-deep: #E56E4F;
  --cream: #F2E7D3;
  --tan: #EBCBB0;
  --mint: #E9F4EE;
  --offwhite: #FCF8F3;

  --ink: #223E5B;
  --ink-soft: #5B7189;
  --line: rgba(34,62,91,0.12);

  --font-display: "Fraunces", serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 10px;

  --shadow-soft: 0 20px 45px -25px rgba(34,62,91,0.35);
  --shadow-card: 0 12px 30px -18px rgba(34,62,91,0.28);

  --maxw: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--offwhite);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; margin:0; padding:0; }
button{ font-family:inherit; }

@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}

.container{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 28px;
}

/* =========================================================
   Reveal-on-scroll
========================================================= */
.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .7s ease, transform .7s ease;
}
.reveal.is-visible{
  opacity:1;
  transform:translateY(0);
}

/* =========================================================
   Buttons
========================================================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 26px;
  border-radius:999px;
  font-weight:600;
  font-size:0.95rem;
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{
  background:var(--coral);
  color:var(--offwhite);
  box-shadow:0 14px 28px -14px rgba(246,145,118,0.65);
}
.btn-primary:hover{ background:var(--coral-deep); }
.btn-ghost{
  background:transparent;
  color:var(--navy);
  border-color:var(--line);
}
.btn-ghost:hover{ border-color:var(--navy); }
.btn-outline{
  background:transparent;
  color:var(--navy);
  border-color:var(--navy);
}
.btn-outline:hover{ background:var(--navy); color:var(--offwhite); }
.btn-sm{ padding:10px 20px; font-size:0.85rem; }
.btn-lg{ padding:17px 34px; font-size:1.02rem; }

/* =========================================================
   Nav
========================================================= */
.nav{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(252,248,243,0.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:16px 28px;
  display:flex;
  align-items:center;
  gap:28px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  margin-right:auto;
}
.brand-mark{ color:var(--coral); display:flex; }
.brand-text{
  font-family:var(--font-display);
  font-weight:600;
  font-size:1.28rem;
  color:var(--navy);
}
.brand-text em{ font-style:normal; color:var(--coral); }

.nav-links{
  display:flex;
  align-items:center;
  gap:26px;
}
.nav-links a{
  font-size:0.93rem;
  font-weight:500;
  color:var(--ink-soft);
  position:relative;
  padding:4px 0;
  transition:color .2s ease;
}
.nav-links a:hover{ color:var(--navy); }
.nav-links a::after{
  content:"";
  position:absolute;
  left:0; bottom:-2px;
  width:0; height:2px;
  background:var(--coral);
  transition:width .25s ease;
}
.nav-links a:hover::after{ width:100%; }

.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:36px; height:32px;
  background:none;
  border:none;
  cursor:pointer;
}
.nav-toggle span{
  height:2px;
  background:var(--navy);
  border-radius:2px;
  transition:transform .25s ease, opacity .25s ease;
}

/* =========================================================
   Hero
========================================================= */
.hero{
  position:relative;
  padding:120px 0 80px;
  overflow:hidden;
}
.hero-inner{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 28px;
  display:grid;
  grid-template-columns:1.05fr 0.9fr;
  gap:48px;
  align-items:center;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:0.78rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--coral-deep);
  margin:0 0 14px;
}
.hero-title{
  font-family:var(--font-display);
  font-size:clamp(3rem, 6vw, 5.2rem);
  font-weight:600;
  line-height:1;
  margin:0 0 22px;
  color:var(--navy);
}
.hero-sub{
  font-family:var(--font-display);
  font-style:italic;
  font-weight:500;
  font-size:clamp(1.15rem, 1.6vw, 1.45rem);
  color:var(--navy-soft);
  margin:0 0 20px;
  max-width:44ch;
}
.hero-body{
  color:var(--ink-soft);
  max-width:52ch;
  margin:0 0 34px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; }

.hero-art{ position:relative; }
.rings-svg{ width:100%; height:auto; }
.ring{ fill:none; stroke-width:2.5; }
.ring-mint{ stroke:#8FC3A6; }
.ring-tan{ stroke:var(--tan); }
.ring-coral{ stroke:var(--coral); }
.dot{ fill:var(--navy); }

.hero-scroll-cue{
  position:absolute;
  left:50%;
  bottom:22px;
  transform:translateX(-50%);
  width:26px; height:42px;
  border:2px solid var(--line);
  border-radius:20px;
}
.hero-scroll-cue span{
  display:block;
  width:4px; height:8px;
  background:var(--coral);
  border-radius:4px;
  margin:7px auto 0;
  animation:cueDrop 1.8s ease-in-out infinite;
}
@keyframes cueDrop{
  0%{ transform:translateY(0); opacity:1; }
  70%{ transform:translateY(14px); opacity:0; }
  100%{ transform:translateY(0); opacity:0; }
}

/* =========================================================
   Sections (general)
========================================================= */
.section{ padding:96px 0; }
.section-cream{ background:var(--cream); }
.section-mint{ background:var(--mint); }
.section-title{
  font-family:var(--font-display);
  font-size:clamp(1.9rem, 3vw, 2.6rem);
  font-weight:600;
  color:var(--navy);
  margin:0 0 20px;
  max-width:18ch;
}
.section-lead{
  color:var(--ink-soft);
  max-width:66ch;
  margin:0 0 48px;
  font-size:1.05rem;
}
.center-cta{ text-align:center; margin-top:44px; }

/* =========================================================
   About feature cards
========================================================= */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:22px;
}
.feature-card{
  background:var(--offwhite);
  border-radius:var(--radius-md);
  padding:30px 26px;
  box-shadow:var(--shadow-card);
}
.feature-card i{
  color:var(--coral);
  width:26px; height:26px;
  margin-bottom:18px;
}
.feature-card h3{
  font-family:var(--font-display);
  font-size:1.15rem;
  margin:0 0 8px;
  color:var(--navy);
}
.feature-card p{
  color:var(--ink-soft);
  font-size:0.94rem;
  margin:0;
}

/* =========================================================
   Research area cards
========================================================= */
.area-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
}
.area-card{
  border:1.5px solid var(--line);
  border-radius:var(--radius-md);
  padding:28px 26px;
  transition:border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.area-card:hover{
  border-color:var(--coral);
  transform:translateY(-4px);
  box-shadow:var(--shadow-card);
}
.area-card i{ color:var(--navy); width:24px; height:24px; margin-bottom:16px; }
.area-card h3{ font-family:var(--font-display); font-size:1.08rem; margin:0 0 8px; color:var(--navy); }
.area-card p{ color:var(--ink-soft); font-size:0.92rem; margin:0 0 16px; }
.area-card .link{
  font-size:0.86rem;
  font-weight:600;
  color:var(--coral-deep);
  display:inline-flex;
  align-items:center;
  gap:6px;
}

/* =========================================================
   Tabs / Research works
========================================================= */
.tabs{ display:flex; gap:10px; margin-bottom:40px; }
.tab-btn{
  background:transparent;
  border:1.5px solid var(--line);
  padding:11px 22px;
  border-radius:999px;
  font-weight:600;
  font-size:0.9rem;
  color:var(--ink-soft);
  cursor:pointer;
  transition:all .25s ease;
}
.tab-btn.active, .tab-btn:hover{
  background:var(--navy);
  border-color:var(--navy);
  color:var(--offwhite);
}
.tab-panel{ display:none; }
.tab-panel.active{ display:block; }

.work-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:22px;
}
.work-card{
  background:var(--offwhite);
  border-radius:var(--radius-md);
  padding:28px;
  box-shadow:var(--shadow-card);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.work-card .tag{
  font-family:var(--font-mono);
  font-size:0.72rem;
  color:var(--coral-deep);
  text-transform:uppercase;
  letter-spacing:0.05em;
}
.work-card h3{ font-family:var(--font-display); margin:0; color:var(--navy); font-size:1.1rem; }
.work-card p{ color:var(--ink-soft); font-size:0.92rem; margin:0; flex:1; }
.work-card .meta{ font-size:0.82rem; color:var(--ink-soft); }
.work-card .btn{ align-self:flex-start; margin-top:6px; }

/* progress bar for ongoing */
.progress{
  height:6px;
  border-radius:6px;
  background:var(--line);
  overflow:hidden;
}
.progress span{ display:block; height:100%; background:var(--coral); border-radius:6px; }

/* =========================================================
   Publications
========================================================= */
.pub-list{ display:flex; flex-direction:column; gap:1px; background:var(--line); border-radius:var(--radius-md); overflow:hidden; }
.pub-item{
  background:var(--offwhite);
  padding:26px 28px;
  display:grid;
  grid-template-columns:1fr auto;
  gap:20px;
  align-items:center;
}
.pub-item h3{ font-family:var(--font-display); font-size:1.05rem; margin:0 0 6px; color:var(--navy); }
.pub-item .authors{ color:var(--ink-soft); font-size:0.9rem; margin:0 0 4px; }
.pub-item .venue{ font-family:var(--font-mono); font-size:0.78rem; color:var(--ink-soft); }
.pub-actions{ display:flex; gap:10px; flex-wrap:wrap; }

/* =========================================================
   Blog
========================================================= */
.blog-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.blog-card{ background:var(--offwhite); border-radius:var(--radius-md); overflow:hidden; box-shadow:var(--shadow-card); }
.blog-cover{
  height:150px;
  background:linear-gradient(135deg, var(--tan), var(--mint));
  position:relative;
}
.blog-cover svg{ position:absolute; inset:0; width:100%; height:100%; }
.blog-body{ padding:22px 24px 26px; }
.blog-cat{ font-family:var(--font-mono); font-size:0.72rem; color:var(--coral-deep); text-transform:uppercase; letter-spacing:0.05em; }
.blog-date{ font-size:0.8rem; color:var(--ink-soft); margin-left:8px; }
.blog-card h3{ font-family:var(--font-display); font-size:1.05rem; margin:10px 0 8px; color:var(--navy); }
.blog-card p{ color:var(--ink-soft); font-size:0.9rem; margin:0 0 14px; }
.blog-card .link{ font-weight:600; font-size:0.86rem; color:var(--coral-deep); }

/* =========================================================
   Events timeline
========================================================= */
.timeline{ position:relative; padding-left:28px; border-left:2px solid var(--line); display:flex; flex-direction:column; gap:34px; }
.timeline-item{ position:relative; }
.timeline-item::before{
  content:"";
  position:absolute;
  left:-33px; top:4px;
  width:12px; height:12px;
  border-radius:50%;
  background:var(--coral);
  border:3px solid var(--offwhite);
  box-shadow:0 0 0 2px var(--coral);
}
.timeline-item .date{ font-family:var(--font-mono); font-size:0.8rem; color:var(--coral-deep); }
.timeline-item h3{ font-family:var(--font-display); font-size:1.1rem; margin:6px 0 6px; color:var(--navy); }
.timeline-item .venue{ font-size:0.86rem; color:var(--ink-soft); margin-bottom:8px; }
.timeline-item p{ color:var(--ink-soft); font-size:0.94rem; margin:0 0 14px; max-width:60ch; }

/* =========================================================
   Tools
========================================================= */
.tool-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.tool-card{
  background:var(--offwhite);
  border-radius:var(--radius-md);
  padding:28px;
  box-shadow:var(--shadow-card);
}
.tool-card i{ color:var(--navy); width:24px; height:24px; margin-bottom:16px; }
.tool-card h3{ font-family:var(--font-display); font-size:1.08rem; margin:0 0 8px; color:var(--navy); }
.tool-card p{ color:var(--ink-soft); font-size:0.92rem; margin:0 0 18px; }

/* =========================================================
   Stats
========================================================= */
.stats-section{ background:var(--navy); color:var(--offwhite); padding:80px 0; }
.stats-grid{ display:grid; grid-template-columns:repeat(6,1fr); gap:20px; text-align:center; }
.stat-num{
  display:block;
  font-family:var(--font-display);
  font-size:clamp(2.1rem,3.5vw,3rem);
  font-weight:600;
  color:var(--coral);
}
.stat-label{ font-size:0.82rem; color:rgba(252,248,243,0.75); }

/* =========================================================
   Collaboration banner
========================================================= */
.collab{ background:var(--cream); padding:90px 0; text-align:center; }
.collab-inner h2{ font-family:var(--font-display); font-size:clamp(1.8rem,3vw,2.4rem); color:var(--navy); margin:0 0 14px; }
.collab-inner p{ color:var(--ink-soft); max-width:56ch; margin:0 auto 30px; }

/* =========================================================
   Contact
========================================================= */
.contact-grid{ display:grid; grid-template-columns:0.85fr 1.15fr; gap:60px; align-items:start; }
.contact-list{ margin-top:28px; display:flex; flex-direction:column; gap:16px; }
.contact-list li{ display:flex; align-items:center; gap:12px; color:var(--ink-soft); font-size:0.94rem; }
.contact-list i{ color:var(--coral); width:19px; height:19px; flex-shrink:0; }

.contact-form{ display:flex; flex-direction:column; gap:18px; }
.contact-form label{ display:flex; flex-direction:column; gap:8px; font-size:0.86rem; font-weight:600; color:var(--navy); }
.contact-form input, .contact-form textarea{
  font-family:inherit;
  font-size:0.95rem;
  padding:13px 16px;
  border-radius:var(--radius-sm);
  border:1.5px solid var(--line);
  background:var(--offwhite);
  color:var(--ink);
  resize:vertical;
}
.contact-form input:focus, .contact-form textarea:focus{
  outline:none;
  border-color:var(--coral);
}
.contact-form button{ align-self:flex-start; }
.form-note{ font-size:0.86rem; color:var(--navy); min-height:1.2em; margin:0; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--coral);
  outline-offset:2px;
}

/* =========================================================
   Footer
========================================================= */
.footer{ background:var(--navy); color:var(--offwhite); padding:56px 0 24px; }
.footer-inner{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:24px; padding-bottom:32px; border-bottom:1px solid rgba(252,248,243,0.15); }
.footer-brand{ display:flex; align-items:center; gap:12px; }
.footer-brand .brand-mark{ color:var(--coral); }
.footer-name{ font-family:var(--font-display); font-size:1.15rem; margin:0; }
.footer-tag{ font-size:0.82rem; color:rgba(252,248,243,0.65); margin:2px 0 0; }
.footer-nav{ display:flex; gap:22px; flex-wrap:wrap; }
.footer-nav a{ font-size:0.88rem; color:rgba(252,248,243,0.8); }
.footer-nav a:hover{ color:var(--coral); }
.footer-copy{ text-align:center; font-size:0.8rem; color:rgba(252,248,243,0.55); margin:24px 0 0; }

/* =========================================================
   Responsive
========================================================= */
@media (max-width:1024px){
  .feature-grid, .area-grid, .work-grid, .blog-grid, .tool-grid{ grid-template-columns:repeat(2,1fr); }
  .stats-grid{ grid-template-columns:repeat(3,1fr); row-gap:36px; }
  .contact-grid{ grid-template-columns:1fr; gap:40px; }
}

@media (max-width:860px){
  .hero-inner{ grid-template-columns:1fr; text-align:left; }
  .hero-art{ order:-1; max-width:320px; margin:0 auto 12px; }
  .nav-links, .nav-cta{ display:none; }
  .nav-toggle{ display:flex; }

  .nav-links.open{
    display:flex;
    position:absolute;
    top:100%; left:0; right:0;
    flex-direction:column;
    background:var(--offwhite);
    padding:20px 28px 26px;
    border-bottom:1px solid var(--line);
    gap:16px;
  }
  .nav-cta.open{
    display:inline-flex;
    position:absolute;
    top:calc(100% + 168px);
    left:28px;
  }
}

@media (max-width:640px){
  .section{ padding:72px 0; }
  .feature-grid, .area-grid, .work-grid, .blog-grid, .tool-grid{ grid-template-columns:1fr; }
  .stats-grid{ grid-template-columns:repeat(2,1fr); }
  .pub-item{ grid-template-columns:1fr; }
  .hero{ padding:100px 0 64px; }
  .tabs{ flex-wrap:wrap; }
}

/* =========================================================
   Nav — signed-in user chip
========================================================= */
.nav-user{ display:flex; align-items:center; gap:14px; }
.nav-user-chip{ display:flex; align-items:center; gap:8px; }
.nav-user-avatar{
  width:30px; height:30px;
  border-radius:50%;
  object-fit:cover;
  border:1.5px solid var(--line);
}
.nav-user-avatar--fallback{
  display:flex; align-items:center; justify-content:center;
  background:var(--navy);
  color:var(--offwhite);
  font-family:var(--font-display);
  font-weight:600;
  font-size:0.85rem;
}
.nav-user-name{ font-size:0.9rem; font-weight:600; color:var(--navy); }

@media (max-width:860px){
  .nav-user{ display:none; }
}

/* =========================================================
   Live stats strip (below nav)
========================================================= */
.stats-strip{
  background:var(--cream);
  border-bottom:1px solid var(--line);
}
.stats-strip-inner{
  display:flex;
  flex-wrap:wrap;
  gap:22px 34px;
  padding:12px 28px;
  align-items:center;
  justify-content:center;
}
.stats-strip-item{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:0.85rem;
  color:var(--ink-soft);
}
.stats-strip-item i{ width:15px; height:15px; color:var(--coral-deep); flex-shrink:0; }
.stats-strip-item strong{ color:var(--navy); font-weight:700; }

@media (max-width:640px){
  .stats-strip-inner{ gap:12px 20px; padding:10px 20px; }
  .stats-strip-item{ font-size:0.78rem; }
}

/* =========================================================
   Auth pages (login / register)
========================================================= */
.auth-section{ padding:80px 0 120px; }
.auth-container{ display:flex; justify-content:center; }
.auth-card{
  width:100%;
  max-width:440px;
  background:var(--offwhite);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-soft);
  padding:44px 40px;
}
.auth-google-btn{ width:100%; }
.auth-divider{
  display:flex;
  align-items:center;
  gap:14px;
  margin:26px 0;
  font-size:0.82rem;
  color:var(--ink-soft);
}
.auth-divider::before, .auth-divider::after{
  content:"";
  flex:1;
  height:1px;
  background:var(--line);
}
.auth-error{
  background:rgba(229,110,79,0.1);
  border:1px solid rgba(229,110,79,0.35);
  color:var(--coral-deep);
  padding:12px 16px;
  border-radius:var(--radius-sm);
  font-size:0.88rem;
  margin:0 0 18px;
}
.auth-switch{ margin-top:22px; font-size:0.9rem; color:var(--ink-soft); text-align:center; }
.auth-switch a{ color:var(--coral-deep); font-weight:600; }

/* =========================================================
   Nav — active link state
========================================================= */
.nav-links a.active{ color:var(--navy); }
.nav-links a.active::after{ width:100%; }

/* =========================================================
   Breadcrumb bar (subpages)
========================================================= */
.breadcrumb-bar{
  background:var(--offwhite);
  border-bottom:1px solid var(--line);
}
.breadcrumb-inner{
  display:flex;
  align-items:center;
  gap:6px;
  padding:14px 28px;
  font-size:0.85rem;
  color:var(--ink-soft);
}
.breadcrumb-inner a{ color:var(--ink-soft); transition:color .2s ease; }
.breadcrumb-inner a:hover{ color:var(--coral-deep); }
.breadcrumb-inner i{ width:14px; height:14px; }
.breadcrumb-inner span{ color:var(--navy); font-weight:600; }

/* =========================================================
   Page hero (subpage intro band)
========================================================= */
.page-hero{ padding:64px 0 44px; }
.page-hero .section-title{ max-width:none; }
.page-hero .section-lead{ margin-bottom:0; }

/* =========================================================
   Section head row (title + "view all" CTA, homepage teasers)
========================================================= */
.section-head-row{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:20px;
  margin-bottom:40px;
}
.section-head-row .section-title{ margin-bottom:8px; }
.section-head-row .section-lead{ margin-bottom:0; }
@media (max-width:640px){
  .section-head-row{ flex-direction:column; align-items:flex-start; }
}

/* =========================================================
   Sign-in gate (blog posts, tools, downloads)
========================================================= */
.auth-gate{
  margin-top:32px;
  padding:36px 32px;
  background:var(--mint);
  border-radius:var(--radius-md);
  text-align:center;
}
.auth-gate i{ color:var(--navy); width:26px; height:26px; margin-bottom:12px; }
.auth-gate h3{ font-family:var(--font-display); color:var(--navy); margin:0 0 8px; }
.auth-gate p{ color:var(--ink-soft); margin:0 0 20px; }
.auth-gate-actions{ display:flex; gap:12px; justify-content:center; flex-wrap:wrap; }