in so it scrolls inside
the column instead of forcing the page wider. */
.table-scroll {
width: 100%;
overflow-x: auto;
-webkit-overflow-scrolling: touch;
margin: 1.5rem 0;
}
.table-scroll > table { margin: 0; min-width: 480px; }
/* === Keep inline math on one line (KaTeX) ===
Without this rule narrow columns (e.g. the per-card text in the controller
walk-through) can break a single inline expression across lines, splitting
variables and operators awkwardly. On phones the prose column is already
so narrow that a single expression like ``R_{WP}(q) ∈ SO(3)`` would punch
out of the column; allow wrapping there. */
.katex { white-space: nowrap; }
.katex-display { white-space: normal; }
@media (max-width: 540px) {
.katex { white-space: normal; }
}
/* === Residual-PPO quantitative payoff block (head-to-head drop rate) === */
.rl-payoff {
margin: 2.0rem auto 0.5rem;
max-width: 720px;
}
.rl-payoff-lead {
text-align: center;
font-size: 0.94rem;
color: var(--text);
margin: 0 auto 1.2rem;
max-width: 600px;
}
/* =============================================================
Setup page — reference frames layout + hardware card grid
============================================================= */
.frames-layout {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 1.5rem;
align-items: start;
margin: 1.5rem 0 1.5rem;
}
@media (max-width: 880px) {
.frames-layout { grid-template-columns: 1fr; }
}
.frames-cards {
display: flex;
flex-direction: column;
gap: 0.85rem;
}
.frame-card {
--c: var(--berkeley-blue);
display: grid;
grid-template-columns: 50px 1fr;
gap: 0.85rem;
padding: 0.85rem 1rem;
background: #fdfcf8;
border: 1px solid rgba(0,0,0,0.07);
border-radius: 12px;
position: relative;
overflow: hidden;
transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out),
border-color 0.35s var(--ease-out);
}
.frame-card.frame-world { --c: var(--berkeley-blue); }
.frame-card.frame-plate { --c: var(--berkeley-gold-dark); }
.frame-card.frame-image { --c: #4a7fa8; }
.frame-card.frame-camera { --c: #6643a0; }
.frame-card::before {
content: '';
position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
background: var(--c);
}
.frame-card:hover {
transform: translateY(-2px);
box-shadow: 0 6px 18px rgba(0,0,0,0.06);
border-color: color-mix(in srgb, var(--c) 30%, transparent);
}
.frame-card .frame-icon {
width: 44px; height: 44px;
display: flex; align-items: center; justify-content: center;
border-radius: 10px;
background: color-mix(in srgb, var(--c) 12%, #ffffff);
color: var(--c);
}
.frame-card .frame-icon svg { width: 30px; height: 30px; }
.frame-card .frame-body { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; }
.frame-card .frame-tag {
font-family: var(--font-mono);
font-size: 0.7rem;
letter-spacing: 0.05em;
color: var(--c);
font-weight: 600;
}
.frame-card h4 {
font-family: var(--font-serif);
font-size: 1.0rem;
margin: 0 0 0.3rem;
font-weight: 600;
color: var(--text);
}
.frame-card p {
font-size: 0.88rem;
line-height: 1.55;
margin: 0;
color: var(--text);
}
.fig-arm {
margin: 0;
}
.fig-arm .diagram { width: 100%; display: block; margin: 0 auto; }
/* Hardware grid */
.hardware-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 1rem;
margin: 1.5rem 0 2rem;
}
@media (min-width: 1100px) {
.hardware-grid:not(.hardware-grid--2) { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
.hardware-grid { grid-template-columns: 1fr; }
}
/* Modifier: keep a strict 2-per-row layout even on wide screens. Used for the
vision pipeline where four cards read better as 2 × 2 than 3 + 1. */
.hardware-grid.hardware-grid--2 { grid-template-columns: 1fr 1fr; }
.hw-card {
background: #fdfcf8;
border: 1px solid rgba(0,0,0,0.07);
border-radius: 12px;
padding: 1.15rem 1.15rem 1.1rem;
position: relative;
overflow: hidden;
transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out),
border-color 0.35s var(--ease-out);
}
.hw-card::before {
content: '';
position: absolute; top: 0; left: 0; right: 0; height: 2.5px;
background: linear-gradient(90deg, var(--berkeley-blue), var(--berkeley-gold));
transform: scaleX(0);
transform-origin: left;
transition: transform 0.45s var(--ease-out);
}
.hw-card:hover {
transform: translateY(-4px);
box-shadow: 0 10px 24px rgba(0,0,0,0.07);
border-color: rgba(47, 67, 196,0.18);
}
.hw-card:hover::before { transform: scaleX(1); }
.hw-card .hw-figure {
width: 100%;
aspect-ratio: 4 / 3;
display: flex;
align-items: center;
justify-content: center;
border-radius: 10px;
background: linear-gradient(135deg, #fef9ed, #fbf3dc);
margin-bottom: 0.9rem;
overflow: hidden;
}
.hw-card .hw-figure svg {
width: 100%;
height: 100%;
display: block;
}
.hw-card h4 {
font-family: var(--font-serif);
font-size: 1.04rem;
margin: 0 0 0.2rem;
font-weight: 600;
color: var(--text);
}
.hw-card .hw-spec {
font-family: var(--font-mono);
font-size: 0.72rem;
color: var(--berkeley-gold-dark);
letter-spacing: 0.02em;
margin-bottom: 0.55rem;
}
.hw-card p {
font-size: 0.88rem;
line-height: 1.55;
margin: 0;
color: var(--text);
}
/* Slim page-hero used when there is no abstract paragraph below the title. */
/* =============================================================
Mobile / tablet polish pass
These rules override the desktop defaults below the listed
breakpoint. Adding to the bottom keeps the cascade simple: any
prior rule wins on desktop, mobile-specific tightening wins on
small screens via the media query alone.
============================================================= */
/* Tablet (<= 768 px). Mainly shrink generous padding around the hero
and page-hero so the user lands on content, not whitespace. */
@media (max-width: 768px) {
.hero {
padding-top: 6rem;
padding-bottom: 2.5rem;
min-height: 0;
}
.page-hero {
padding: 6rem 0 2.5rem;
}
.math-block {
padding: 1rem 1.1rem;
font-size: 1rem;
}
/* Stop any image / SVG from punching out of its container. */
img, svg, video, canvas { max-width: 100%; height: auto; }
/* Inline SVGs that rely on an inline width attribute (common in the
control / mpc / physics figures) get a height fallback. */
figure svg, .svg-schema svg, .fc-arrow svg, figure img {
max-width: 100%;
height: auto;
}
}
/* Phone (<= 480 px). Tightens container padding and bumps touch targets
so a 375 px-wide screen still has a usable content column. */
@media (max-width: 480px) {
.container { padding: 0 1rem; }
.hero { padding-top: 5rem; padding-bottom: 2rem; }
.page-hero { padding: 5rem 0 2rem; }
.math-block { padding: 0.85rem 0.85rem; margin: 1rem 0; }
.math-block .label { position: static; display: block; margin-bottom: 0.25rem; }
/* 44x44 px minimum tap target on the primary CTA. */
.btn { padding: 0.95rem 1.4rem; min-height: 44px; }
/* Drop fixed minimums on the table-scroll wrapper so very narrow
screens (<= 360 px) still don't show a double scrollbar. */
.table-scroll > table { min-width: 360px; }
/* Eq-tile + svg-schema: keep them inside the 1rem container padding. */
.eq-tile { padding: 1rem 1rem; }
.svg-schema { max-width: 100%; padding: 0; }
}
/* Narrow phone (<= 380 px). Last-resort knock-down for iPhone SE
portrait, small Androids, foldables in folded mode. */
@media (max-width: 380px) {
h1, .page-hero h1 { font-size: clamp(2rem, 8vw, 2.4rem); }
.hero-deck { gap: 0.75rem; }
.nav .brand { font-size: 0.95rem; }
}
/* =============================================================
Home hero on mobile (<= 720 px)
Order: eyebrow + H1, then arm video peeking out, then the 4
system-overview cards that sit on top of the video's lower
half. The cards stay full (icon + label + text) but become a
tight 2 x 2 grid.
============================================================= */
@media (max-width: 720px) {
.hero {
padding-top: 5.5rem;
padding-bottom: 2.25rem;
min-height: 0;
}
/* Single column flow: eyebrow + H1 + video + cards + CTA + rows. */
.hero-grid { display: block; }
.hero-text { display: block; }
/* Video sits in the natural flow right after the headline. */
.hero-arm {
margin: 1.25rem auto -3.5rem; /* negative bottom lets cards overlap */
max-width: 320px;
position: relative;
z-index: 1;
}
.hero-arm video {
opacity: 1;
filter: drop-shadow(0 12px 28px rgba(47, 67, 196, 0.14));
}
/* Cards overlap the bottom of the video, so the upper part of the arm
peeks out above the card grid. */
.hero-text > .hero-deck {
position: relative;
z-index: 2;
margin-top: 0;
}
.hero-deck {
grid-template-columns: repeat(2, 1fr) !important;
gap: 0.6rem;
margin: 0 0 1.5rem;
}
.hd-card { padding: 0.85rem 0.95rem; background: var(--surface); }
.hd-card .hd-head { gap: 0.45rem; margin-bottom: 0.45rem; }
.hd-card .hd-icon { width: 26px; height: 26px; border-radius: 6px; }
.hd-card .hd-icon svg { width: 14px; height: 14px; }
.hd-card .hd-label { font-size: 0.65rem; letter-spacing: 0.1em; }
.hd-card .hd-text { font-size: 0.8rem; line-height: 1.45; }
/* Always reveal the top accent stripe on touch. */
.hd-card::before { transform: scaleX(1); }
/* Controller CTA deck stacks. */
.cta-deck { grid-template-columns: 1fr; gap: 0.6rem; }
/* hero-row tag chips: keep them compact on a single line if possible. */
.hero-row { gap: 0.4rem; }
.hero-row-label { font-size: 0.7rem; }
.hero-row .tag { font-size: 0.78rem; padding: 0.25rem 0.55rem; }
}
@media (max-width: 480px) {
/* On the very smallest phones drop the card body font a touch so all
four blurbs fit above the fold without making cards too tall. */
.hd-card .hd-text { font-size: 0.74rem; line-height: 1.4; }
.hero-arm { max-width: 260px; margin-bottom: -3rem; }
}
.page-hero.page-hero-slim {
padding: 7rem 0 2.25rem;
}
.page-hero.page-hero-slim h1 {
margin-bottom: 0;
}