/* Lynx — Robotics & Perception Research Group, BRAC University */

:root {
  --bg:        #fbfaf8;
  --bg-alt:    #f3f1ec;
  --card:      #ffffff;
  --fg:        #14120f;
  --muted:     #6b6459;
  --line:      #e2ded5;
  --accent:    #a9590a;
  --accent-fg: #ffffff;
  --accent-soft: #fdf1e2;
  --shadow:    0 1px 2px rgba(20,18,15,.05), 0 8px 24px rgba(20,18,15,.05);
  --wrap: 1120px;
  --font: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e0d0c; --bg-alt: #151412; --card: #1a1815; --fg: #f2efe9;
    --muted: #9c948a; --line: #2b2822; --accent: #e8a33d; --accent-fg: #17140f;
    --accent-soft: #241d12;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.32);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e0d0c; --bg-alt: #151412; --card: #1a1815; --fg: #f2efe9;
  --muted: #9c948a; --line: #2b2822; --accent: #e8a33d; --accent-fg: #17140f;
  --accent-soft: #241d12;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.32);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: inherit; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding-inline: 24px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-fg); padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

/* ── header ───────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 66px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; margin-right: auto; }
.brand-mark { width: 30px; height: 30px; flex: none; fill: none; stroke: var(--accent); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.brand-mark .eye { fill: var(--accent); stroke: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 700; letter-spacing: -.02em; font-size: 1.12rem; }
.brand-sub { font-family: var(--mono); font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }

.nav { display: flex; gap: 26px; }
.nav a {
  text-decoration: none; font-size: .88rem; font-weight: 500; color: var(--muted);
  padding: 4px 0; border-bottom: 1.5px solid transparent; transition: color .15s, border-color .15s;
}
.nav a:hover, .nav a:focus-visible { color: var(--fg); border-bottom-color: var(--accent); }

.theme-toggle, .menu-toggle {
  display: grid; place-items: center; width: 38px; height: 38px; flex: none;
  border: 1px solid var(--line); border-radius: 9px; background: var(--card);
  color: var(--muted); cursor: pointer; transition: color .15s, border-color .15s;
}
.theme-toggle:hover, .menu-toggle:hover { color: var(--fg); border-color: var(--accent); }
.theme-toggle svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-moon { display: block; }
}

.menu-toggle { display: none; gap: 4px; }
.menu-toggle span { display: block; width: 16px; height: 1.6px; background: currentColor; border-radius: 2px; }
.mobile-nav { display: none; flex-direction: column; border-top: 1px solid var(--line); padding: 8px 24px 16px; }
.mobile-nav a { text-decoration: none; padding: 10px 0; font-weight: 500; border-bottom: 1px solid var(--line); }

@media (max-width: 860px) {
  .nav { display: none; }
  .menu-toggle { display: grid; }
  .mobile-nav:not([hidden]) { display: flex; }
}

/* ── hero ─────────────────────────────────────────────────── */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.scan { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55; pointer-events: none; }
.hero-inner { position: relative; padding-block: clamp(64px, 11vw, 128px) clamp(48px, 8vw, 88px); }

.eyebrow { font-family: var(--mono); font-size: .7rem; letter-spacing: .13em; text-transform: uppercase; color: var(--muted); margin: 0 0 22px; }
.hero-title {
  margin: 0; font-size: clamp(3.6rem, 13vw, 8rem); line-height: .92;
  letter-spacing: -.045em; font-weight: 700;
}
.hero-lede { margin: 26px 0 0; max-width: 40ch; font-size: clamp(1.08rem, 2.3vw, 1.42rem); line-height: 1.5; color: var(--fg); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.btn {
  display: inline-block; text-decoration: none; font-size: .9rem; font-weight: 600;
  padding: 11px 20px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--fg); transition: border-color .15s, transform .15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }

.facts {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 20px 28px; margin: 56px 0 0; padding-top: 28px; border-top: 1px solid var(--line);
}
.facts div { margin: 0; }
.facts dt { font-family: var(--mono); font-size: .65rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.facts dd { margin: 5px 0 0; font-weight: 500; font-size: .95rem; }

/* ── bands & section headings ─────────────────────────────── */
.band { padding-block: clamp(56px, 8vw, 96px); border-bottom: 1px solid var(--line); }
.band.alt { background: var(--bg-alt); }

.section-title {
  display: flex; align-items: baseline; gap: 14px; margin: 0 0 12px;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem); letter-spacing: -.025em; font-weight: 700;
}
.section-title .num { font-family: var(--mono); font-size: .72rem; font-weight: 500; color: var(--accent); letter-spacing: .08em; }
.section-lede { color: var(--muted); max-width: 60ch; margin: 0 0 34px; }

.prose-grid { display: grid; grid-template-columns: minmax(0, 320px) minmax(0, 1fr); gap: 28px 56px; align-items: start; }
.prose p { margin: 0 0 18px; max-width: 66ch; color: var(--muted); }
.prose .big { font-size: clamp(1.15rem, 2.4vw, 1.5rem); line-height: 1.45; color: var(--fg); letter-spacing: -.015em; margin-bottom: 24px; }
@media (max-width: 860px) { .prose-grid { grid-template-columns: 1fr; } }

/* ── research cards ───────────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(272px, 1fr)); gap: 20px; margin-top: 34px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 26px 24px 22px; box-shadow: var(--shadow); transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-soft); margin-bottom: 16px; }
.card-icon svg { width: 24px; height: 24px; fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.card-icon .fill { fill: var(--accent); stroke: none; }
.card h3 { margin: 0 0 10px; font-size: 1.14rem; letter-spacing: -.02em; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 18px 0 0; }
.tags li { font-family: var(--mono); font-size: .67rem; letter-spacing: .04em; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 3px 9px; }

/* ── current work ─────────────────────────────────────────── */
.current { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 44px; margin-top: 30px; }
@media (max-width: 900px) { .current { grid-template-columns: 1fr; gap: 32px; } }

.status { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: .7rem; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.current-title { margin: 0 0 18px; font-size: clamp(1.3rem, 3vw, 1.75rem); letter-spacing: -.025em; }
.current-main p { color: var(--muted); margin: 0 0 16px; max-width: 60ch; }
.embargo {
  border-left: 2px solid var(--accent); padding: 2px 0 2px 16px;
  font-size: .9rem; color: var(--fg) !important; margin-top: 22px !important;
}

.pillars { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; align-content: start; }
.pillars li { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; }
.pillar-n { font-family: var(--mono); font-size: .68rem; color: var(--accent); letter-spacing: .1em; }
.pillars h4 { margin: 4px 0 7px; font-size: 1rem; letter-spacing: -.015em; }
.pillars p { margin: 0; font-size: .89rem; color: var(--muted); }

/* ── publications ─────────────────────────────────────────── */
.pubs { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.pub {
  display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 20px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px;
}
@media (max-width: 640px) { .pub { grid-template-columns: 1fr; gap: 8px; } }
.pub-year { font-family: var(--mono); font-size: .82rem; color: var(--accent); padding-top: 3px; }
.pub-authors { margin: 0 0 6px; font-size: .87rem; color: var(--muted); }
.pub-title { margin: 0 0 6px; font-size: 1.1rem; line-height: 1.35; letter-spacing: -.02em; }
.pub-title a { text-decoration: none; background-image: linear-gradient(var(--accent), var(--accent)); background-size: 0 1.5px; background-repeat: no-repeat; background-position: 0 100%; transition: background-size .2s; }
.pub-title a:hover { background-size: 100% 1.5px; }
.pub-venue { margin: 0 0 12px; font-size: .85rem; color: var(--muted); }
.pub-summary { margin: 0 0 16px; font-size: .92rem; color: var(--muted); max-width: 62ch; }
.pub-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .05em; text-decoration: none;
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px;
  background: transparent; color: var(--muted); cursor: pointer; transition: color .15s, border-color .15s;
}
.chip:hover { color: var(--accent); border-color: var(--accent); }
.bibtex {
  margin: 14px 0 0; padding: 16px; background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: 10px; font-family: var(--mono); font-size: .74rem; line-height: 1.65;
  overflow-x: auto; color: var(--muted);
}
.note { margin: 24px 0 0; font-size: .86rem; color: var(--muted); }

/* ── people ───────────────────────────────────────────────── */
.person {
  display: grid; grid-template-columns: 88px minmax(0, 1fr); gap: 26px; margin-top: 30px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 28px;
}
@media (max-width: 640px) { .person { grid-template-columns: 1fr; gap: 16px; } }
.person-avatar {
  width: 88px; height: 88px; border-radius: 14px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); font-family: var(--mono);
  font-size: 1.5rem; letter-spacing: .04em;
}
.person-body h3 { margin: 0 0 5px; font-size: 1.3rem; letter-spacing: -.025em; }
.person-role { margin: 0 0 14px; font-size: .87rem; color: var(--accent); }
.person-bio { margin: 0 0 18px; color: var(--muted); max-width: 62ch; font-size: .93rem; }
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.contact-list li { display: flex; flex-wrap: wrap; gap: 10px; align-items: baseline; font-size: .9rem; }
.contact-list .k, .contact-card .k {
  font-family: var(--mono); font-size: .63rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted); min-width: 48px;
}
.contact-list a { color: var(--fg); text-decoration-color: var(--line); text-underline-offset: 3px; }
.contact-list a:hover { color: var(--accent); }

.join { margin-top: 22px; padding: 24px; border: 1px dashed var(--line); border-radius: 14px; }
.join h3 { margin: 0 0 8px; font-size: 1.05rem; letter-spacing: -.02em; }
.join p { margin: 0; color: var(--muted); font-size: .93rem; max-width: 70ch; }

/* ── contact ──────────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 44px; align-items: start; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; gap: 28px; } }
.contact-cards { display: grid; gap: 12px; }
.contact-card {
  display: grid; gap: 6px; text-decoration: none; background: var(--card);
  border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; transition: border-color .15s;
}
.contact-card:not(.static):hover { border-color: var(--accent); }
.contact-card .v { font-size: .95rem; font-weight: 500; word-break: break-word; }
.contact-card.static .v { font-weight: 400; color: var(--muted); font-size: .89rem; line-height: 1.6; }

/* ── footer ───────────────────────────────────────────────── */
.site-footer { padding-block: 44px; background: var(--bg); }
.footer-inner { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; align-items: flex-start; }
.footer-brand { margin: 0 0 6px; font-weight: 700; letter-spacing: -.02em; }
.footer-note, .footer-meta { margin: 0; font-size: .82rem; color: var(--muted); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-nav a { font-size: .85rem; color: var(--muted); text-decoration: none; }
.footer-nav a:hover { color: var(--accent); }