@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');

:root { color-scheme: light; --ink: #182b36; --muted: #536773; --accent: #087e8b; --paper: #fff; --pale: #eaf5f6; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: 'DM Sans', sans-serif; line-height: 1.7; }
h1, h2, h3 { font-family: Manrope, sans-serif; line-height: 1.25; }
.hero { padding: 64px 24px 52px; background: #fff; text-align: center; }
.hero-inner, main { max-width: 1080px; margin: 0 auto; }
.eyebrow { margin: 0 0 18px; color: var(--accent); font-size: .78rem; font-weight: 700; letter-spacing: .15em; text-transform: uppercase; }
h1 { max-width: 960px; margin: 0 auto 22px; font-size: clamp(2rem, 4.4vw, 3.35rem); letter-spacing: -.045em; }
.authors { margin: 0 auto 4px; font-size: 1.1rem; font-weight: 600; }
.authors sup, .affiliations sup { color: var(--accent); }
.affiliations { margin: 0 auto; color: var(--muted); font-size: .88rem; }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin: 25px 0 34px; }
.button { display: inline-block; border: 1px solid #b9cbcf; border-radius: 999px; padding: 8px 19px; color: var(--ink); background: rgba(255,255,255,.7); font-size: .9rem; font-weight: 600; text-decoration: none; transition: .18s ease; }
.button:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); }
.button.primary { border-color: var(--accent); color: white; background: var(--accent); }
.button.unavailable { border-style: dashed; color: #697c84; background: transparent; cursor: default; }
.button.unavailable:hover { transform: none; border-color: #b9cbcf; }
.hero-figure { max-width: 740px; margin: 0 auto; padding: 0; }
.hero-figure img, .figure img { display: block; width: 100%; height: auto; }
.tagline { max-width: 760px; margin: 25px auto 0; color: #38515d; font-family: Manrope, sans-serif; font-size: 1.18rem; font-weight: 600; }
.section { padding: 68px 24px; }
.section h2 { margin: 0 0 15px; text-align: center; font-size: 2rem; letter-spacing: -.035em; }
.narrow { max-width: 850px; margin: auto; }
.narrow > p { color: #40545e; }
.section-lead { max-width: 780px; margin: 0 auto 30px; color: var(--muted); text-align: center; }
.video-section { max-width: 1040px; margin: auto; }
video { display: block; width: 100%; max-height: 620px; border-radius: 13px; background: #111; box-shadow: 0 12px 36px rgba(0,0,0,.13); }
.subheading { margin: 48px 0 18px; font-size: 1.35rem; }
.video-card { min-width: 0; padding: 18px; border: 1px solid #e1e9eb; border-radius: 12px; background: #fff; }
.video-card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.video-card p { margin: 0 0 14px; color: var(--muted); font-size: .91rem; }
.video-card video { max-height: none; border-radius: 8px; box-shadow: none; }
.alignment-section { position: relative; left: 50%; width: min(1160px, calc(100vw - 48px)); max-width: 1160px; margin: 0; transform: translateX(-50%); }
.alignment-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: center; }
.alignment-figure-column { width: 95%; justify-self: center; }
.alignment-video { width: 90%; justify-self: center; }
.alignment-figure-column { min-width: 0; }
.alignment-figure-copy { margin: 0 0 14px; text-align: center; }
.alignment-figure-copy h3 { margin: 0 0 5px; font-size: 1.05rem; }
.alignment-figure-copy p { max-width: 620px; margin: 0 auto; color: var(--muted); font-size: .91rem; }
.alignment-figure { width: min(100%, 560px); margin: 0 auto; padding: 9px; border: 1px solid #e1e9eb; border-radius: 12px; background: #fff; box-shadow: 0 8px 24px rgba(20,50,60,.06); }
.alignment-figure img { display: block; width: 100%; height: auto; border-radius: 5px; }
.alignment-video { margin: 0; }
.alignment-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 0 0 14px; }
.alignment-tab { border: 1px solid #d3e0e3; border-radius: 999px; padding: 7px 12px; color: var(--muted); background: #f7fafa; font: inherit; font-size: .82rem; font-weight: 600; line-height: 1.3; cursor: pointer; transition: .18s ease; }
.alignment-tab:hover { border-color: var(--accent); color: var(--accent); }
.alignment-tab[aria-selected="true"] { border-color: var(--accent); color: #fff; background: var(--accent); }
.alignment-tab:focus-visible { outline: 3px solid rgba(8,126,139,.25); outline-offset: 2px; }
.alignment-video-frame { position: relative; width: fit-content; max-width: 100%; margin: 0 auto; }
.alignment-video video {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: min(75vh, 760px);
  margin: 0 auto;
}
.figure { max-width: 980px; margin: 26px auto 34px; }
.method-figure { position: relative; left: 50%; width: 120%; max-width: 1176px; margin-right: 0; margin-left: 0; transform: translateX(calc(-50% - 8px)); }
.secondary-figure { max-width: 860px; margin-top: 40px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px; margin-top: 34px; }
.cards article { padding: 23px; border: 1px solid #e1e9eb; border-radius: 12px; background: #fff; }
.number { color: var(--accent); font-size: .78rem; font-weight: 700; letter-spacing: .1em; }
.cards h3, .task h3 { margin: 8px 0; font-size: 1.08rem; }
.cards p, .task p { margin: 0; color: var(--muted); font-size: .94rem; }
.shaded { position: relative; left: 50%; width: 100vw; max-width: 100vw; margin-left: 0; padding: 68px 24px; transform: translateX(-50%); background: var(--pale); }
.shaded-inner { max-width: 1080px; margin: 0 auto; }
.evaluation-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin: 35px 0 45px; }
.evaluation-card { display: grid; grid-template-columns: minmax(170px, 220px) 1fr; gap: 20px; align-items: start; padding: 20px; border: 1px solid #e1e9eb; border-radius: 12px; background: #fff; }
.task-image { display: block; width: 100%; max-height: 220px; object-fit: contain; border-radius: 8px; background: white; }
.evaluation-content h3 { margin: 2px 0 4px; font-size: 1.2rem; }
.evaluation-content > p { margin: 0 0 15px; color: var(--muted); font-size: .92rem; }
.rollout-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.rollout { min-width: 0; }
.rollout h4 { margin: 0 0 7px; font-size: .9rem; }
.rollout video { max-height: none; border-radius: 7px; box-shadow: none; }
.comparison { max-width: 1000px; }
.caption { max-width: 780px; margin: -18px auto 0; color: var(--muted); font-size: .9rem; text-align: center; }
pre { overflow-x: auto; margin: 22px 0 0; padding: 21px 24px; border-radius: 10px; color: #d9edf0; background: #18313b; font-size: .86rem; line-height: 1.65; }
footer { padding: 23px; color: #d4e1e3; background: #18313b; text-align: center; font-size: .85rem; }
footer p { margin: 0; }
@media (max-width: 900px) { .alignment-section { left: auto; width: auto; max-width: 100%; margin: auto; transform: none; } .method-figure { left: auto; width: 100%; margin-left: auto; transform: none; } .alignment-layout { grid-template-columns: 1fr; gap: 24px; } .alignment-figure { width: min(100%, 520px); } }
@media (max-width: 700px) { .hero { padding: 45px 18px 36px; } .section { padding: 50px 19px; } .shaded { padding: 50px 19px; } .cards { grid-template-columns: 1fr; } .method-figure { left: auto; width: 100%; margin-left: auto; transform: none; } .alignment-layout { gap: 20px; } .alignment-figure { width: min(100%, 416px); } .evaluation-card { grid-template-columns: 1fr; } .task-image { max-height: 260px; } .affiliations { max-width: 430px; } }