/* ============================================================
   Reverse Image Search — /apps/reverse_image_search/
   An optical bench: one image travels through an aperture,
   becomes a temporary link and splits into four beams, one per
   engine. Palette from the app's own theme (lib/main.dart):
   #0A0A0F night, #16161F surface, #6366F1 indigo, #22D3EE cyan,
   #F472B6 pink. Display: Sora. Text: Instrument Sans.
   ============================================================ */

/* ---------- Tokens: dark is the app's own theme --------------- */

:root {
  color-scheme: dark;

  /* site chrome tokens */
  --bg: #0A0A0F;
  --bg-raised: #16161F;
  --bg-inset: #07070B;
  --bg-hover: #1E1E2E;
  --line: #24243A;
  --line-strong: #36364F;
  --fg: #ECECF6;
  --fg-muted: #A5A8C8;
  --fg-faint: #8487A3;
  --accent: #818CF8;
  --accent-strong: #A5B4FC;
  --accent-ink: #0A0A0F;
  --accent-soft: rgba(99, 102, 241, 0.16);

  /* page */
  --ris-indigo: #6366F1;
  --ris-cyan: #22D3EE;
  --ris-pink: #F472B6;
  --ris-bracket: #22D3EE;
  --ris-band: #0E0E16;
  --ris-card: #14141D;
  --ris-dot: rgba(165, 168, 200, 0.11);
  --ris-glow: rgba(99, 102, 241, 0.32);
  --ris-iris-fill-a: rgba(30, 30, 46, 0.92);
  --ris-iris-fill-b: rgba(42, 42, 62, 0.92);
  --ris-iris-line: rgba(34, 211, 238, 0.42);
  --ris-ring: rgba(165, 168, 200, 0.18);
  --ris-rail: rgba(165, 168, 200, 0.16);
  --ris-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.8);
  --beam-1: #22D3EE;
  --beam-2: #818CF8;
  --beam-3: #C084FC;
  --beam-4: #F472B6;

  --ris-display: "Sora", "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --ris-sans: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --app-measure: 1180px;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #F3F4FA;
    --bg-raised: #FFFFFF;
    --bg-inset: #E8E9F3;
    --bg-hover: #E4E5F2;
    --line: #DADCEA;
    --line-strong: #C3C6DA;
    --fg: #12131F;
    --fg-muted: #50536A;
    --fg-faint: #6E7190;
    --accent: #4F46E5;
    --accent-strong: #4338CA;
    --accent-ink: #FFFFFF;
    --accent-soft: rgba(79, 70, 229, 0.10);
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.04), 0 16px 40px -16px rgba(30, 30, 70, 0.2);

    --ris-indigo: #4F46E5;
    --ris-cyan: #0891B2;
    --ris-pink: #DB2777;
    --ris-bracket: #0891B2;
    --ris-band: #E9EAF5;
    --ris-card: #FFFFFF;
    --ris-dot: rgba(80, 83, 106, 0.16);
    --ris-glow: rgba(99, 102, 241, 0.22);
    --ris-iris-fill-a: rgba(255, 255, 255, 0.9);
    --ris-iris-fill-b: rgba(232, 233, 245, 0.92);
    --ris-iris-line: rgba(79, 70, 229, 0.38);
    --ris-ring: rgba(80, 83, 106, 0.2);
    --ris-rail: rgba(80, 83, 106, 0.2);
    --ris-shadow: 0 30px 60px -32px rgba(40, 40, 90, 0.35);
    --beam-1: #0891B2;
    --beam-2: #4F46E5;
    --beam-3: #9333EA;
    --beam-4: #DB2777;
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #F3F4FA;
  --bg-raised: #FFFFFF;
  --bg-inset: #E8E9F3;
  --bg-hover: #E4E5F2;
  --line: #DADCEA;
  --line-strong: #C3C6DA;
  --fg: #12131F;
  --fg-muted: #50536A;
  --fg-faint: #6E7190;
  --accent: #4F46E5;
  --accent-strong: #4338CA;
  --accent-ink: #FFFFFF;
  --accent-soft: rgba(79, 70, 229, 0.10);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.04), 0 16px 40px -16px rgba(30, 30, 70, 0.2);

  --ris-indigo: #4F46E5;
  --ris-cyan: #0891B2;
  --ris-pink: #DB2777;
  --ris-bracket: #0891B2;
  --ris-band: #E9EAF5;
  --ris-card: #FFFFFF;
  --ris-dot: rgba(80, 83, 106, 0.16);
  --ris-glow: rgba(99, 102, 241, 0.22);
  --ris-iris-fill-a: rgba(255, 255, 255, 0.9);
  --ris-iris-fill-b: rgba(232, 233, 245, 0.92);
  --ris-iris-line: rgba(79, 70, 229, 0.38);
  --ris-ring: rgba(80, 83, 106, 0.2);
  --ris-rail: rgba(80, 83, 106, 0.2);
  --ris-shadow: 0 30px 60px -32px rgba(40, 40, 90, 0.35);
  --beam-1: #0891B2;
  --beam-2: #4F46E5;
  --beam-3: #9333EA;
  --beam-4: #DB2777;
}

/* ---------- Base ---------------------------------------------- */

.app-reverse_image_search main,
.app-reverse_image_search .app-foot {
  font-family: var(--ris-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

.app-reverse_image_search main {
  overflow-x: clip;
}

.app-reverse_image_search main h1,
.app-reverse_image_search main h2,
.app-reverse_image_search main h3 {
  font-family: var(--ris-display);
  color: var(--fg);
}

.app-reverse_image_search main h2 {
  font-weight: 400;
  font-size: clamp(1.85rem, 1.2rem + 2.3vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 1.1rem;
  max-width: 18ch;
}

.app-reverse_image_search main p {
  max-width: 62ch;
  text-wrap: pretty;
}

.ris-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.ris-wrap {
  max-width: var(--app-measure);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.ris-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.22em;
}

.ris-link:hover {
  text-decoration-color: currentColor;
}

.app-reverse_image_search .app-foot {
  font-size: 0.92rem;
}

/* store badges sit on dark night in the dark theme: give them an edge */
.app-reverse_image_search .store-badge {
  --badge-focus: var(--accent);
}

/* ---------- Focus brackets (the page's motif) ----------------- */

.focus-frame,
.ris-lock {
  --fb-len: 18px;
  --fb-w: 2px;
  --fb-c: var(--ris-bracket);
  position: absolute;
  pointer-events: none;
  background:
    linear-gradient(var(--fb-c), var(--fb-c)) top left / var(--fb-len) var(--fb-w) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) top left / var(--fb-w) var(--fb-len) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) top right / var(--fb-len) var(--fb-w) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) top right / var(--fb-w) var(--fb-len) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) bottom left / var(--fb-len) var(--fb-w) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) bottom left / var(--fb-w) var(--fb-len) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) bottom right / var(--fb-len) var(--fb-w) no-repeat,
    linear-gradient(var(--fb-c), var(--fb-c)) bottom right / var(--fb-w) var(--fb-len) no-repeat;
}

/* ---------- Hero ---------------------------------------------- */

.ris-hero {
  position: relative;
  max-width: var(--app-measure);
  margin: 0 auto;
  padding: clamp(2.25rem, 5vw, 4.5rem) var(--gutter) clamp(3.5rem, 8vw, 6.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 2.5rem clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.ris-hero-copy {
  position: relative;
  z-index: 1;
}

.ris-path {
  margin: 0 0 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0;
}

.ris-path a {
  color: var(--fg-muted);
}

.ris-path a:hover {
  color: var(--fg);
}

.ris-icon {
  display: block;
  width: 76px;
  height: 76px;
  border-radius: 19px;
  margin: 0 0 1.6rem;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 14px 34px -12px var(--ris-glow);
}

.ris-title {
  position: relative;
  display: inline-block;
  margin: 0 0 1.6rem -0.2em;
  padding: 0.12em 0.2em 0.18em;
  font-weight: 300;
  font-size: clamp(2.6rem, 1.3rem + 4.6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.ris-title-text {
  display: inline-block;
}

.ris-title-line {
  display: block;
  white-space: nowrap;
}

.ris-lock {
  inset: -0.06em -0.12em -0.02em;
  --fb-len: clamp(14px, 1.4vw, 22px);
}

.ris-lede {
  font-family: var(--ris-display);
  font-size: clamp(1.2rem, 1rem + 0.75vw, 1.55rem);
  line-height: 1.34;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin: 0 0 1rem;
  max-width: 30ch !important;
  text-wrap: pretty;
}

.ris-sub {
  color: var(--fg-muted);
  margin: 0 0 2rem;
  max-width: 46ch !important;
}

.ris-meta {
  margin: 1rem 0 0;
  font-size: 0.92rem;
  color: var(--fg-muted);
}

.ris-hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 560px;
}

.ris-hero-device {
  --device-w: 292px;
  --device-frame: #101016;
  --device-edge: rgba(255, 255, 255, 0.14);
  --device-shadow: 0 50px 90px -40px rgba(0, 0, 0, 0.75), 0 0 90px -30px var(--ris-glow);
  position: relative;
  z-index: 1;
}

/* ---------- Iris (aperture) ----------------------------------- */

.ris-iris {
  overflow: visible;
}

.ris-iris .iris-ring {
  fill: none;
  stroke: var(--ris-ring);
  stroke-width: 1;
}

.ris-iris .iris-ring-soft {
  stroke-dasharray: 2 6;
}

.ris-iris .iris-ticks {
  fill: none;
  stroke: var(--ris-ring);
  stroke-width: 10;
  stroke-dasharray: 1 13.24;
}

.ris-iris .iris-glow {
  fill: var(--ris-glow);
  filter: blur(40px);
}

.ris-iris .iris-blades path {
  stroke: var(--ris-iris-line);
  stroke-width: 1;
  stroke-linejoin: round;
}

.ris-iris .iris-blades path:nth-child(odd) {
  fill: var(--ris-iris-fill-a);
}

.ris-iris .iris-blades path:nth-child(even) {
  fill: var(--ris-iris-fill-b);
}

.ris-iris-hero {
  position: absolute;
  z-index: 0;
  left: 50%;
  top: 50%;
  width: min(640px, 150vw);
  height: auto;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  opacity: 0.9;
}

/* ---------- The bench (signature) ----------------------------- */

.ris-bench {
  position: relative;
  padding-block: clamp(4.5rem, 9vw, 7.5rem);
  background: var(--ris-band);
  border-block: 1px solid var(--line);
}

/* optical breadboard: a regular grid of mounting holes */
.ris-bench::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--ris-dot) 1.5px, transparent 1.8px);
  background-size: 26px 26px;
  background-position: center;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 82%, transparent);
  pointer-events: none;
}

.ris-bench .ris-wrap {
  position: relative;
}

.bench-head p {
  color: var(--fg-muted);
  margin: 0;
}

.bench-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin: 2.25rem 0 1.25rem;
}

.bench-controls[hidden] {
  display: none;
}

.sample-pick {
  border: 0;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.sample-pick legend {
  padding: 0;
  margin: 0 0 0.6rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.sample-opts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.sample-opt {
  position: relative;
}

.sample-opt input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
}

.sample-opt label {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 56px;
  padding: 0.35rem 1rem 0.35rem 0.35rem;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: var(--bg-raised);
  color: var(--fg);
  font-weight: 500;
  font-size: 0.98rem;
  cursor: pointer;
  user-select: none;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
}

.sample-opt label svg {
  width: 36px;
  height: 45px;
  border-radius: 8px;
  flex: none;
}

.sample-opt label:hover {
  border-color: var(--accent);
}

.sample-opt input:checked + label {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.sample-opt input:focus-visible + label {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.bench-replay {
  min-height: 48px;
  padding: 0 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--fg);
  font: 500 0.98rem/1 var(--ris-sans);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.bench-replay:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bench-replay:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.bench-stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(170px, 236px) minmax(220px, 1fr) minmax(270px, 340px);
  align-items: center;
  gap: 2rem;
  margin-top: 2rem;
  padding: clamp(1.75rem, 3vw, 2.75rem) clamp(1.25rem, 3vw, 2.75rem);
  border-radius: 28px;
  border: 1px solid var(--line);
  background: var(--bg);
  box-shadow: var(--ris-shadow);
}

.bench-controls:not([hidden]) + .bench-stage {
  margin-top: 0;
}

.beams {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  z-index: 0;
}

.beams .rail {
  fill: none;
  stroke: var(--ris-rail);
  stroke-width: 1;
  stroke-dasharray: 3 5;
}

.beams .beam-glow {
  fill: none;
  stroke-width: 7;
  stroke-linecap: round;
  opacity: 0.22;
}

.beams .beam-core {
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
}

.beams .photon {
  opacity: 0;
}

.bench-source,
.bench-path,
.bench-engines {
  position: relative;
  z-index: 1;
}

.bench-source {
  margin: 0;
  justify-self: start;
  width: 100%;
}

.bench-photo {
  --lock: 1;
  position: relative;
  border-radius: 14px;
  box-shadow: 0 24px 50px -24px rgba(0, 0, 0, 0.7);
  touch-action: pan-y;
  cursor: zoom-in;
}

.bench-photo .smp {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 240 / 300;
  border-radius: 14px;
}

.bench-photo .focus-frame {
  inset: calc(-16px + 9px * var(--lock));
  opacity: var(--lock);
  --fb-len: 20px;
}

.bench-source figcaption {
  position: absolute;
  left: 0;
  top: calc(100% + 0.8rem);
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.loupe {
  --loupe: 120px;
  position: absolute;
  left: 0;
  top: 0;
  width: var(--loupe);
  height: var(--loupe);
  border-radius: 50%;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.85);
  transition: opacity 0.15s, transform 0.15s;
  box-shadow: 0 0 0 2px var(--ris-cyan), 0 0 0 7px rgba(10, 10, 15, 0.55), 0 18px 40px -10px rgba(0, 0, 0, 0.7);
  z-index: 3;
}

.loupe.is-on {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.loupe svg {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  transform-origin: 0 0;
}

.bench-path {
  display: flex;
  justify-content: space-around;
  align-items: center;
  gap: 1rem;
}

.node {
  position: relative;
  text-align: center;
}

.node-dot {
  position: relative;
  display: grid;
  place-items: center;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  transition: border-color 0.3s, box-shadow 0.3s;
  z-index: 2;
}

.node.is-lit .node-dot {
  border-color: var(--ris-cyan);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ris-cyan) 14%, transparent), 0 0 36px -6px var(--ris-cyan);
}

.node-link.is-lit .node-dot {
  border-color: var(--ris-pink);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ris-pink) 14%, transparent), 0 0 36px -6px var(--ris-pink);
}

.ris-iris-node {
  width: 62px;
  height: 62px;
}

.ris-iris-node .iris-blades path {
  stroke-width: 0.8;
}

.link-glyph {
  width: 36px;
  height: 36px;
  fill: none;
  stroke: var(--ris-pink);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.node-label {
  position: absolute;
  left: 50%;
  top: calc(100% + 0.75rem);
  transform: translateX(-50%);
  display: grid;
  gap: 0.1rem;
  width: max-content;
  max-width: 11rem;
  padding: 0.15rem 0.4rem;
  border-radius: 8px;
  background: var(--bg);
  line-height: 1.3;
}

.node-label b {
  font-family: var(--ris-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--fg);
}

.node-label small {
  font-size: 0.84rem;
  color: var(--fg-muted);
}

.bench-engines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.engine {
  --p: 0;
  position: relative;
  padding: 0.85rem 1rem 0.9rem 1.15rem;
  border-radius: 16px;
  background: var(--ris-card);
  border: 1px solid var(--line);
  transition: border-color 0.35s, box-shadow 0.35s;
}

/* the port where the beam lands */
.engine::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 50%;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ris-card);
  border: 1.5px solid var(--line-strong);
  transform: translate(0, -50%);
  transition: border-color 0.3s, background-color 0.3s, box-shadow 0.3s;
}

.engine[data-port="top"]::before {
  left: 50%;
  top: -6px;
  transform: translate(-50%, 0);
}

.engine[data-port="right"]::before {
  left: auto;
  right: -6px;
}

.engine.is-loading::before,
.engine.is-ready::before {
  border-color: var(--beam);
}

.engine.is-ready::before {
  background: var(--beam);
  box-shadow: 0 0 12px var(--beam);
}

.engine.is-ready {
  border-color: color-mix(in srgb, var(--beam) 60%, var(--line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--beam) 30%, transparent), 0 12px 40px -18px var(--beam);
}

.engine-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.engine h3 {
  margin: 0;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.engine-status {
  flex: none;
  font-size: 0.84rem;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.engine.is-ready .engine-status {
  color: var(--fg);
  font-weight: 600;
}

.engine.is-ready .engine-status::before {
  content: "";
  display: inline-block;
  width: 0.5em;
  height: 0.5em;
  margin-right: 0.4em;
  border-radius: 50%;
  background: var(--beam);
  vertical-align: 0.08em;
}

.engine p {
  margin: 0.2rem 0 0.75rem;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--fg-muted);
}

.engine-bar {
  display: block;
  height: 3px;
  border-radius: 3px;
  background: var(--line);
  overflow: hidden;
}

.engine-bar i {
  display: block;
  height: 100%;
  background: var(--beam);
  transform-origin: left center;
  transform: scaleX(var(--p));
}

.bench-foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1rem 3rem;
  margin-top: 1.75rem;
  align-items: start;
}

.bench-readout {
  margin: 0;
  min-height: 3.2em;
  font-family: var(--ris-display);
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--fg);
}

.bench-cue {
  margin: 0;
  font-size: 0.95rem;
  color: var(--fg-muted);
  padding-left: 1rem;
  border-left: 2px solid var(--line-strong);
  transition: border-color 0.4s, color 0.4s;
}

.bench-cue a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.22em;
  white-space: nowrap;
}

.bench-cue.is-shown {
  border-left-color: var(--ris-cyan);
  color: var(--fg);
}

/* ---------- Results: engine tabs ------------------------------ */

.ris-results,
.ris-pick {
  padding-block: clamp(4.5rem, 10vw, 8rem);
}

.ris-pick {
  padding-top: 0;
}

.ris-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3rem clamp(2.5rem, 7vw, 6rem);
  align-items: center;
}

.ris-split-flip > .ris-copy {
  order: 2;
}

.ris-copy p {
  color: var(--fg-muted);
}

.ris-copy .ris-note {
  color: var(--fg);
  padding-top: 1rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.results-demo {
  width: 368px;
  max-width: 100%;
  justify-self: center;
}

.results-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 4px;
  margin-bottom: 1.25rem;
  border-radius: 14px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
}

.results-tabs[hidden] {
  display: none;
}

.results-tabs [role="tab"] {
  min-height: 48px;
  padding: 0.3rem 0.15rem;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--fg-muted);
  font: 500 0.8rem/1.2 var(--ris-sans);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.results-tabs [role="tab"]:hover {
  color: var(--fg);
  background: var(--bg-hover);
}

.results-tabs [role="tab"][aria-selected="true"] {
  color: var(--fg);
  font-weight: 600;
  background: linear-gradient(135deg, color-mix(in srgb, var(--beam) 30%, transparent), color-mix(in srgb, var(--beam) 14%, transparent));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--beam) 45%, transparent);
}

.results-tabs [role="tab"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.ris-results-device {
  --device-w: 300px;
  --device-frame: #101016;
  --device-shadow: var(--ris-shadow), 0 0 80px -40px var(--ris-glow);
  margin: 0 auto;
}

.ris-results-device .app-device-screen > img {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.ris-results-device .app-device-screen > img.is-active {
  position: relative;
  opacity: 1;
}

.results-caption {
  margin: 1.1rem auto 0;
  max-width: 30ch !important;
  min-height: 3em;
  text-align: center;
  font-size: 0.95rem;
  color: var(--fg-muted);
}

/* ---------- Pick ---------------------------------------------- */

.ris-pick-device {
  --device-w: 270px;
  --device-frame: #101016;
  --device-shadow: var(--ris-shadow);
  justify-self: center;
}

/* ---------- Route (privacy) ----------------------------------- */

.ris-route {
  padding-block: clamp(4.5rem, 9vw, 7rem);
  background: var(--ris-band);
  border-block: 1px solid var(--line);
}

.route-head p {
  color: var(--fg-muted);
}

.route {
  position: relative;
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

/* the light path the photo takes, node to node */
.route li:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 16px;
  right: -2rem;
  top: 16px;
  height: 2px;
  background: linear-gradient(90deg, var(--ris-cyan), var(--ris-indigo));
  opacity: 0.75;
}

.route li:nth-child(2)::before {
  background: linear-gradient(90deg, var(--ris-indigo), var(--ris-pink));
}

.route li {
  position: relative;
  padding-top: 3.1rem;
}

.route h3 {
  margin: 0 0 0.45rem;
  font-weight: 600;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}

.route p {
  margin: 0;
  color: var(--fg-muted);
  font-size: 0.98rem;
}

.route-node {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--ris-band);
  border: 2px solid var(--node-c, var(--ris-cyan));
  color: var(--node-c, var(--ris-cyan));
}

.route li:nth-child(2) .route-node {
  --node-c: var(--ris-indigo);
}

.route li:nth-child(3) .route-node {
  --node-c: var(--ris-pink);
}

.route-node svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.route-node svg circle {
  fill: currentColor;
  stroke: none;
}

.route-aside {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem 3rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.route-aside p {
  margin: 0 0 0.75rem;
  color: var(--fg-muted);
  font-size: 0.98rem;
}

.route-aside p:last-child {
  grid-column: 1 / -1;
  margin: 0.5rem 0 0;
}

/* ---------- Closing call to action ---------------------------- */

.ris-get {
  position: relative;
  padding-block: clamp(5rem, 11vw, 9rem);
  overflow: clip;
}

.ris-get-inner {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 420px;
}

.ris-iris-get {
  position: absolute;
  right: max(-180px, -14vw);
  top: 50%;
  width: min(620px, 120vw);
  aspect-ratio: 1;
  height: auto;
  transform: translateY(-50%);
  opacity: 0.75;
  z-index: 0;
}

.ris-get-copy {
  position: relative;
  z-index: 1;
  max-width: 34rem;
}

.ris-icon-sm {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin-bottom: 1.4rem;
}

.ris-get h2 {
  font-weight: 300 !important;
  font-size: clamp(2.2rem, 1.3rem + 3.4vw, 3.9rem) !important;
  letter-spacing: -0.04em !important;
  max-width: 14ch !important;
}

.ris-get-copy > p {
  color: var(--fg-muted);
  margin: 0 0 1.75rem;
}

/* ---------- Load moment: the title pulls into focus ----------- */

@media (prefers-reduced-motion: no-preference) {
  html.js .ris-title-text {
    animation: ris-focus-pull 1.15s cubic-bezier(0.2, 0.7, 0.2, 1) 0.1s both;
  }

  html.js .ris-lock {
    animation: ris-lock-on 0.75s cubic-bezier(0.3, 1.5, 0.5, 1) 0.65s both;
  }

  @keyframes ris-focus-pull {
    from {
      filter: blur(12px);
      opacity: 0.25;
      transform: scale(1.03);
    }
    to {
      filter: blur(0);
      opacity: 1;
      transform: none;
    }
  }

  @keyframes ris-lock-on {
    from {
      opacity: 0;
      inset: -0.45em -0.5em -0.4em;
    }
    to {
      opacity: 1;
    }
  }
}

/* ---------- Responsive ---------------------------------------- */

@media (max-width: 1040px) {
  .bench-stage {
    grid-template-columns: minmax(150px, 200px) minmax(170px, 1fr) minmax(250px, 300px);
    gap: 1.5rem;
  }

  .node-dot {
    width: 68px;
    height: 68px;
  }

  .ris-iris-node {
    width: 54px;
    height: 54px;
  }
}

@media (max-width: 900px) {
  .ris-hero {
    grid-template-columns: 1fr;
    padding-top: 2rem;
  }

  .ris-hero-visual {
    min-height: 0;
    padding: 2.5rem 0 1rem;
  }

  .ris-iris-hero {
    width: min(600px, 145vw);
  }

  /* bench turns vertical: the beam runs down a trunk and fans out */
  .bench-stage {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 2.25rem;
  }

  .bench-source {
    justify-self: center;
    width: min(220px, 52vw);
  }

  .bench-path {
    flex-direction: column;
    align-items: center;
    gap: 2.25rem;
  }

  .node-dot {
    width: 58px;
    height: 58px;
  }

  .ris-iris-node {
    width: 46px;
    height: 46px;
  }

  .link-glyph {
    width: 30px;
    height: 30px;
  }

  .node-label {
    left: calc(100% + 0.5rem);
    top: 50%;
    transform: translateY(-50%);
    max-width: min(11rem, calc(50vw - 4.9rem));
    text-align: left;
    background: none;
  }

  .node-label b {
    font-size: 0.88rem;
  }

  .node-label small {
    font-size: 0.8rem;
  }

  .bench-engines {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 36px;
    row-gap: 1.5rem;
    margin-top: 1rem;
  }

  .bench-foot {
    grid-template-columns: 1fr;
  }

  .ris-split {
    grid-template-columns: minmax(0, 1fr);
  }

  .ris-split-flip > .ris-copy {
    order: 0;
  }

  .route {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .route li:not(:last-child)::before {
    right: auto;
    bottom: -2.2rem;
    width: 2px;
    height: auto;
    background: linear-gradient(180deg, var(--ris-cyan), var(--ris-indigo));
  }

  .route li:nth-child(2)::before {
    background: linear-gradient(180deg, var(--ris-indigo), var(--ris-pink));
  }

  .route li {
    padding: 0.2rem 0 0 3.25rem;
  }

  .route-aside {
    grid-template-columns: 1fr;
  }

  .ris-iris-get {
    right: auto;
    left: 50%;
    top: 0;
    width: min(520px, 130vw);
    transform: translate(-50%, -30%);
    opacity: 0.35;
  }
}

@media (max-width: 560px) {
  .app-reverse_image_search main {
    font-size: 1rem;
  }

  .ris-hero-device {
    --device-w: 248px;
    --device-radius: 42px;
    --device-bezel: 9px;
  }

  .ris-results-device {
    --device-w: 260px;
    --device-radius: 44px;
    --device-bezel: 10px;
  }

  .ris-pick-device {
    --device-w: 240px;
    --device-radius: 40px;
    --device-bezel: 9px;
  }

  .bench-stage {
    padding: 1.5rem 0.85rem 1.25rem;
    border-radius: 22px;
  }

  .bench-engines {
    column-gap: 30px;
  }

  .engine {
    padding: 0.75rem 0.8rem 0.8rem;
  }

  .engine-top {
    display: block;
  }

  .engine h3 {
    font-size: 0.95rem;
  }

  .engine-status {
    display: block;
    margin-top: 0.1rem;
    font-size: 0.8rem;
  }

  .engine p {
    font-size: 0.84rem;
  }

  .bench-controls {
    position: relative;
    display: block;
  }

  .sample-pick legend {
    min-height: 44px;
    display: flex;
    align-items: center;
    margin-bottom: 0.4rem;
  }

  .bench-replay {
    position: absolute;
    right: 0;
    top: 0;
    min-height: 44px;
    padding: 0 1rem;
    font-size: 0.92rem;
  }

  .sample-opts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.5rem;
  }

  .sample-opt label {
    flex-direction: column;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.55rem 0.3rem 0.5rem;
    font-size: 0.86rem;
    text-align: center;
  }

  .sample-opt label svg {
    width: 34px;
    height: 42px;
  }

  .results-tabs [role="tab"] {
    font-size: 0.74rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .loupe,
  .engine,
  .engine::before,
  .node-dot,
  .bench-cue {
    transition: none;
  }
}