/* ===========================================================
   ARCCS — academic project page
   =========================================================== */

:root{
  --navy:        #102a43;
  --navy-deep:   #0a1c30;
  --ink:         #1f2430;
  --paper:       #faf8f3;
  --paper-alt:   #f1ede3;
  --rule:        #e3dccb;
  --gold:        #4a4fc4;
  --gold-light:  #d7d8f7;
  --muted:       #5b6472;

  --c-compliant: #15803d;
  --c-noncompliant: #dc2626;
  --c-insufficient: #d97706;
  --c-human: #4a4fc4;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(16,42,67,.06), 0 6px 20px rgba(16,42,67,.08);
  --shadow-lg: 0 8px 30px rgba(16,42,67,.14);
  --shadow-tight: 0 1px 2px rgba(16,42,67,.05), 0 2px 8px rgba(16,42,67,.06);

  --font-serif: "Source Serif 4", "Iowan Old Style", "Georgia", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img{ max-width:100%; display:block; }

.container{
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

a{ color: var(--navy); text-decoration: none; }
a:hover{ color: var(--gold); }

h1,h2,h3,h4{
  font-family: var(--font-serif);
  color: var(--navy-deep);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 .5em;
}

::selection{ background: var(--gold-light); }

/* ---------- top texture ---------- */
body::before{
  content:"";
  position: fixed; inset:0;
  background-image:
    radial-gradient(900px 500px at 10% -10%, rgba(74,79,196,.07), transparent 60%),
    radial-gradient(900px 600px at 110% 0%, rgba(16,42,67,.06), transparent 60%);
  pointer-events:none;
  z-index:-1;
}

/* ---------- nav ---------- */
.nav{
  position: sticky; top:0; z-index: 50;
  background: rgba(250,248,243,.88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner{
  max-width:1080px; margin:0 auto; padding: 14px 28px;
  display:flex; align-items:center; justify-content:space-between;
  gap: 18px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-serif); font-weight:700; font-size:1.15rem;
  color: var(--navy-deep);
}
.brand .mark{
  width: 30px; height:30px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  overflow:hidden;
  box-shadow: var(--shadow);
}
.brand .mark img{ width:100%; height:100%; display:block; }
.nav-links{ display:flex; gap: 24px; flex-wrap: wrap; }
.nav-links a{
  font-size:.92rem; font-weight:500; color: var(--muted);
  letter-spacing: .01em;
}
.nav-links a:hover{ color: var(--navy-deep); }
.nav-toggle{ display:none; }

/* ---------- hero ---------- */
.hero{
  padding: 76px 0 48px;
  text-align:center;
  border-bottom: 1px solid var(--rule);
}
.kicker{
  display:inline-flex; align-items:center; gap:8px;
  font-size:.78rem; font-weight:700; letter-spacing:.12em; text-transform:uppercase;
  color: var(--gold);
  background: rgba(74,79,196,.08);
  border: 1px solid rgba(74,79,196,.25);
  padding: 5px 14px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1{
  font-size: clamp(2.1rem, 4.4vw, 3.1rem);
  line-height: 1.18;
  max-width: 880px;
  margin: 0 auto 18px;
}
.hero h1 .accent{ color: var(--gold); }
.tagline{
  max-width: 700px; margin: 0 auto 28px;
  color: var(--muted); font-size: 1.12rem;
}

.authors{
  font-family: var(--font-serif);
  font-size: 1.02rem;
  color: var(--ink);
  margin-bottom: 6px;
}
.authors sup{ color: var(--gold); font-weight:700; }
.affiliations{
  font-size: .86rem; color: var(--muted); margin-bottom: 28px;
}
.affiliations div{ margin: 2px 0; }

.cta-row{
  display:flex; justify-content:center; gap:14px; flex-wrap:wrap;
  margin-bottom: 38px;
}
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-weight:700; font-size:.92rem;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn-primary{
  background: var(--navy-deep); color: #fdf6e3;
  box-shadow: var(--shadow);
}
.btn-primary:hover{ color: #fdf6e3; box-shadow: var(--shadow-lg); }
.btn-outline{
  background: transparent; color: var(--navy-deep);
  border-color: var(--navy-deep);
}
.btn-outline:hover{ color: var(--navy-deep); background: rgba(16,42,67,.06); }
.btn-ghost{
  background: transparent; color: var(--muted); border-color: var(--rule);
}
.btn-ghost:hover{ color: var(--navy-deep); border-color: var(--navy-deep); }

.hero-figure{
  max-width: 940px; margin: 0 auto;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  background: #fff;
  box-shadow: var(--shadow-tight);
  padding: 20px;
}
.hero-figure img{ width:100%; display:block; border-radius: 4px; image-rendering: -webkit-optimize-contrast; }
.fig-caption{
  font-size: .85rem; color: var(--muted);
  max-width: 760px; margin: 14px auto 0;
}
.fig-caption b{ color: var(--ink); }

/* ---------- stat strip ---------- */
.stats{
  display:grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.stat{
  background: var(--paper);
  padding: 30px 18px;
  text-align:center;
}
.stat .num{
  font-family: var(--font-serif); font-weight:700;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  color: var(--navy-deep);
}
.stat .num span{ color: var(--gold); }
.stat .lbl{
  font-size: .82rem; color: var(--muted); margin-top: 6px;
}

/* ---------- section ---------- */
section{ padding: 72px 0; }
section.alt{ background: var(--paper-alt); border-top:1px solid var(--rule); border-bottom:1px solid var(--rule); }

.section-head{
  max-width: 720px; margin: 0 auto 44px; text-align:center;
}
.section-head .eyebrow{
  font-size: .78rem; font-weight:700; letter-spacing:.12em; text-transform:uppercase;
  color: var(--gold); margin-bottom: 10px;
}
.section-head h2{ font-size: clamp(1.6rem, 3vw, 2.1rem); }
.section-head p{ color: var(--muted); }

.prose{ max-width: 760px; margin: 0 auto; color: var(--ink); }
.prose p{ margin: 0 0 1.1em; text-align: justify; text-justify: inter-word; hyphens: auto; }
.prose + .prose{ margin-top: -.4em; }

/* ---------- two-col ---------- */
.cols-2{
  display:grid; grid-template-columns: 1fr 1fr; gap: 28px;
  margin-top: 36px;
}
.card{
  background:#fff; border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 26px 26px 22px; box-shadow: var(--shadow);
}
.card h3{
  font-size: 1.15rem; display:flex; align-items:center; gap:10px;
}
.card h3 .tag{
  font-family: var(--font-sans);
  font-size: .68rem; font-weight:800; letter-spacing:.06em;
  padding: 3px 9px; border-radius: 6px;
  background: var(--navy-deep); color: #fdf6e3;
}
.card p{ color: var(--ink); font-size: .96rem; }
.card ul{ margin: 10px 0 0; padding-left: 1.2em; color: var(--ink); font-size: .94rem; }
.card li{ margin-bottom: 6px; }

/* ---------- label chips ---------- */
.labels-grid{
  display:grid; grid-template-columns: repeat(4,1fr); gap: 16px;
  margin-top: 36px;
}
.label-card{
  border-radius: var(--radius); padding: 20px 18px;
  background:#fff; border: 1px solid var(--rule);
  border-top: 4px solid var(--c);
  box-shadow: var(--shadow);
}
.label-card .chip{
  display:inline-block; font-weight:800; font-size:.74rem;
  letter-spacing:.04em; text-transform: uppercase;
  padding: 4px 10px; border-radius: 6px; margin-bottom: 10px;
  color:#fff; background: var(--c);
}
.label-card p{ font-size: .87rem; color: var(--muted); margin:0; }
.label-card[data-l="c"]{ --c: var(--c-compliant); }
.label-card[data-l="nc"]{ --c: var(--c-noncompliant); }
.label-card[data-l="ii"]{ --c: var(--c-insufficient); }
.label-card[data-l="hr"]{ --c: var(--c-human); }

/* ---------- pipeline steps ---------- */
.flow{
  display:flex; align-items:center; justify-content:center; gap:10px;
  flex-wrap: wrap; margin: 40px 0 8px;
}
.flow .node{
  background:#fff; border:1px solid var(--rule); border-radius: 10px;
  padding: 14px 18px; font-size:.86rem; font-weight:600; color: var(--navy-deep);
  box-shadow: var(--shadow); text-align:center; min-width:140px;
}
.flow .arrow{ color: var(--gold); font-size:1.3rem; }

/* ---------- results tabs ---------- */
.tabs{
  display:flex; justify-content:center; gap:10px; margin-bottom: 32px; flex-wrap:wrap;
}
.tab-btn{
  font-family: var(--font-sans); font-weight:700; font-size:.86rem;
  padding: 10px 20px; border-radius: 999px; border: 1px solid var(--rule);
  background:#fff; color: var(--muted); cursor:pointer;
}
.tab-btn.active{
  background: var(--navy-deep); color:#fdf6e3; border-color: var(--navy-deep);
}
.tab-panel{ display:none; }
.tab-panel.active{ display:block; animation: fade .35s ease; }
@keyframes fade{ from{opacity:0; transform: translateY(4px);} to{opacity:1; transform:none;} }

.table-wrap{
  background:#fff; border:1px solid var(--rule); border-radius: var(--radius);
  overflow:hidden; box-shadow: var(--shadow); margin-bottom: 26px;
}
.table-wrap .t-title{
  padding: 14px 20px; font-weight:700; font-size:.86rem;
  border-bottom: 1px solid var(--rule); color: var(--navy-deep);
  background: var(--paper-alt);
}
table{ width:100%; border-collapse: collapse; font-size: .9rem; }
thead th{
  text-align:left; padding: 12px 20px; font-size:.74rem;
  text-transform: uppercase; letter-spacing:.05em; color: var(--muted);
  border-bottom: 1px solid var(--rule);
}
tbody td{ padding: 11px 20px; border-bottom: 1px solid #f0ecdf; color: var(--ink); }
tbody tr:last-child td{ border-bottom:none; }
tbody tr:hover{ background: #fbf7ec; }
td.num, th.num{ text-align:right; font-family: var(--font-mono); }
.pill{
  display:inline-block; font-size:.74rem; font-weight:800; padding:2px 9px;
  border-radius:6px; color:#fff;
}
.pill.c{ background: var(--c-compliant); }
.pill.nc{ background: var(--c-noncompliant); }
.pill.ii{ background: var(--c-insufficient); }
.pill.hr{ background: var(--c-human); }

.bars{ margin-top: 6px; }
.bar-row{ display:grid; grid-template-columns: 130px 1fr 60px; align-items:center; gap:12px; margin-bottom: 12px; }
.bar-row .name{ font-size:.86rem; font-weight:600; color: var(--ink); }
.bar-track{ background: var(--paper-alt); border-radius: 999px; height: 10px; overflow:hidden; border:1px solid var(--rule); }
.bar-fill{ height:100%; background: linear-gradient(90deg, var(--navy), var(--gold)); border-radius:999px; }
.bar-row .val{ font-family: var(--font-mono); font-size:.82rem; text-align:right; color: var(--muted); }

.findings{
  display:grid; grid-template-columns: repeat(3,1fr); gap:20px; margin-top: 40px;
}
.finding{
  padding: 20px; border-radius: var(--radius); background:#fff;
  border:1px solid var(--rule); box-shadow: var(--shadow);
}
.finding .n{
  font-family:var(--font-serif); font-weight:700; color: var(--gold); font-size:1.4rem;
}
.finding h4{ font-size: 1rem; margin: 6px 0 6px; }
.finding p{ font-size:.88rem; color: var(--muted); margin:0; }

/* ---------- demo gallery ---------- */
.steps{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 36px;
}
.step-card{
  background:#fff; border:1px solid var(--rule); border-radius: var(--radius);
  overflow:hidden; box-shadow: var(--shadow);
}
.step-card .shot{ border-bottom: 1px solid var(--rule); overflow:hidden; background: var(--paper-alt); }
.step-card .body{ padding: 16px 18px; }
.step-card .num{
  display:inline-flex; align-items:center; justify-content:center;
  width: 26px; height:26px; border-radius:50%;
  background: var(--navy-deep); color:#fdf6e3; font-weight:800; font-size:.8rem;
  margin-bottom: 8px;
}
.step-card h4{ font-size: .98rem; margin: 0 0 4px; }
.step-card p{ font-size: .85rem; color: var(--muted); margin:0; }

.full-shot{
  margin-top: 26px;
  border-radius: var(--radius); border:1px solid var(--rule);
  overflow:hidden; box-shadow: var(--shadow-tight); background:#fff;
}

/* ---------- qualitative ---------- */
.quote-grid{
  display:grid; grid-template-columns: 1fr 1fr; gap:22px; margin-top: 36px;
}
.quote-card{
  background:#fff; border:1px solid var(--rule); border-left: 5px solid var(--c);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.quote-card[data-l="c"]{ --c: var(--c-compliant); }
.quote-card[data-l="nc"]{ --c: var(--c-noncompliant); }
.quote-card[data-l="ii"]{ --c: var(--c-insufficient); }
.quote-card[data-l="hr"]{ --c: var(--c-human); }
.quote-card .meta{ font-size:.78rem; color: var(--muted); margin-bottom: 10px; }
.quote-card blockquote{
  font-family: var(--font-serif); font-style: italic; color: var(--ink);
  border-left: 3px solid var(--rule); padding-left: 14px; margin: 0 0 12px;
  font-size: .95rem;
}
.quote-card .expl{ font-size: .87rem; color: var(--muted); }

.callout{
  margin-top: 30px; padding: 22px 26px; border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(16,42,67,.05), rgba(74,79,196,.07));
  border: 1px solid var(--rule);
}
.callout h4{ margin-bottom: 8px; font-size: 1rem; }
.callout p{ margin:0; color: var(--ink); font-size: .93rem; }

/* ---------- citation ---------- */
.cite-box{
  max-width: 760px; margin: 0 auto; position: relative;
  background: var(--navy-deep); color: #f4ead0;
  border-radius: var(--radius); padding: 24px 26px;
  font-family: var(--font-mono); font-size: .82rem; line-height: 1.7;
  overflow-x:auto; box-shadow: var(--shadow-lg);
}
.cite-box pre{ margin:0; white-space: pre-wrap; word-break: break-word; }
.copy-btn{
  position:absolute; top: 14px; right:14px;
  font-family: var(--font-sans); font-size:.72rem; font-weight:700;
  padding: 6px 12px; border-radius: 999px;
  background: rgba(244,234,208,.12); color:#f4ead0; border: 1px solid rgba(244,234,208,.3);
  cursor:pointer;
}
.copy-btn:hover{ background: rgba(244,234,208,.22); }

/* ---------- footer ---------- */
footer{
  padding: 50px 0 60px; text-align:center; color: var(--muted); font-size:.86rem;
  border-top: 1px solid var(--rule);
}
footer a{ color: var(--navy-deep); font-weight:600; }
.foot-links{ display:flex; justify-content:center; gap:18px; margin-bottom: 18px; flex-wrap:wrap; }
.foot-note{ max-width: 640px; margin: 0 auto; line-height:1.6; }

/* ---------- responsive ---------- */
@media (max-width: 920px){
  .cols-2, .quote-grid{ grid-template-columns: 1fr; }
  .labels-grid{ grid-template-columns: repeat(2,1fr); }
  .stats{ grid-template-columns: repeat(2,1fr); }
  .findings{ grid-template-columns: 1fr; }
  .steps{ grid-template-columns: 1fr; }
}
@media (max-width: 720px){
  .nav-links{ display:none; }
  .labels-grid{ grid-template-columns: 1fr; }
}