/* Quiet, local-first interaction polish. No content depends on an animation. */
:root {
  --motion-ease: cubic-bezier(.22, 1, .36, 1);
  --motion-fast: 180ms;
  --motion-switch: 280ms;
}

/* A fixed wash gives the heading depth without a looping background effect. */
.hero {
  position: relative;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  pointer-events: none;
  inset: 0 0 auto;
  height: min(470px, 70vw);
  background: radial-gradient(ellipse at 50% 20%, rgb(255 187 140 / 13%), transparent 68%);
}

.site-nav {
  transition: background var(--motion-switch) ease, border-color var(--motion-switch) ease, box-shadow var(--motion-switch) ease;
}
.site-nav.is-scrolled {
  background: rgb(249 249 250 / 94%);
  border-bottom-color: rgb(200 200 207 / 80%);
  box-shadow: 0 8px 28px -22px rgb(29 29 31 / 35%);
}
.nav-links a {
  transition: color var(--motion-fast) ease, border-color var(--motion-fast) ease, background var(--motion-fast) ease, transform var(--motion-fast) var(--motion-ease);
}
.nav-links a:not(.nav-report):not(.nav-cta) {
  position: relative;
  text-decoration: none;
}
.nav-links a:not(.nav-report):not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms var(--motion-ease);
}
.nav-links a[aria-current]:not(.nav-report):not(.nav-cta)::after {
  transform: scaleX(1);
}
.nav-toggle {
  gap: 7px;
}
.nav-toggle > span {
  display: inline-block;
  transition: transform 200ms var(--motion-ease);
}
.nav-toggle[aria-expanded="true"] > span {
  transform: rotate(45deg);
}

/* A single measured highlight follows the selected tab, including wrapped rows. */
.has-tab-indicator {
  position: relative;
  isolation: isolate;
}
.has-tab-indicator > .tab-indicator {
  position: absolute;
  z-index: 0;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border: 1px solid #eeaa7e;
  border-radius: 8px;
  background: var(--orange-soft);
  box-shadow: 0 2px 7px -5px rgb(173 66 0 / 24%);
  pointer-events: none;
  visibility: hidden;
}
.has-tab-indicator > .tab-indicator.is-positioned {
  visibility: visible;
  transition: transform var(--motion-switch) var(--motion-ease), width var(--motion-switch) var(--motion-ease), height var(--motion-switch) var(--motion-ease);
}
.has-tab-indicator > button {
  position: relative;
  z-index: 1;
}
.has-tab-indicator:has(> .tab-indicator.is-positioned) > button:is(.is-active, [aria-selected="true"]) {
  background: transparent;
  border-color: transparent;
}
.hero-tabs > .tab-indicator {
  border-color: #f2d6c4;
  border-radius: 6px;
}
.hero-tabs button, .tab-button {
  transition: color var(--motion-fast) ease, background var(--motion-fast) ease, border-color var(--motion-fast) ease;
}
.has-tab-indicator > button:focus-visible {
  outline-offset: 3px;
}

/* Training remains three selectable stages, with a calm connected-step layout. */
.training-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  position: relative;
  isolation: isolate;
}
.training-tabs::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 50%;
  left: 8%;
  right: 8%;
  height: 1px;
  background: var(--line-strong);
}
.training-tabs > .tab-button {
  width: 100%;
  min-height: 48px;
  padding-inline: 10px;
  text-align: center;
  background: var(--white);
}
.training-module[data-active-stage] .stage-panel:not([hidden]) {
  border-top-color: #efbc9c;
  box-shadow: 0 8px 24px -23px rgb(173 66 0 / 35%);
}

.button,
.nav-toggle,
.media-caption button,
.demo-toolbar button,
.image-controls button,
.image-controls a,
.dialog-topbar button,
#back-to-top {
  transition: transform var(--motion-fast) var(--motion-ease), background var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease, box-shadow var(--motion-fast) ease;
}
.button > span[aria-hidden="true"] {
  display: inline-block;
  transition: transform 220ms var(--motion-ease);
}
.clip-card {
  transition: transform 220ms var(--motion-ease), border-color var(--motion-fast) ease, box-shadow 220ms ease;
}
.clip-card span {
  transition: color var(--motion-fast) ease, background var(--motion-fast) ease;
}
.figure-card,
.disclosure {
  transition: border-color 220ms ease, box-shadow 220ms ease;
}
.figure-button {
  transition: background var(--motion-fast) ease;
}
.figure-zoom {
  transition: color var(--motion-fast) ease, border-color var(--motion-fast) ease, background var(--motion-fast) ease, transform 220ms var(--motion-ease);
}
.disclosure summary {
  transition: color var(--motion-fast) ease, background var(--motion-fast) ease;
}
.disclosure summary::after {
  transition: color var(--motion-fast) ease;
}
.disclosure[open] {
  border-color: #d9c8bc;
}
.disclosure[open] > summary {
  background: #fffcf9;
}
.footer-inner a, .comparison-meta a, .figure-card figcaption a {
  transition: color var(--motion-fast) ease, text-decoration-color var(--motion-fast) ease;
}

@media (hover: hover) and (pointer: fine) {
  .button:hover,
  .nav-links .nav-report:hover,
  .nav-links .nav-cta:hover {
    transform: translateY(-2px);
  }
  .button-primary:hover {
    box-shadow: 0 8px 18px -10px rgb(29 29 31 / 36%);
  }
  .button-secondary:hover {
    box-shadow: 0 6px 16px -12px rgb(173 66 0 / 35%);
  }
  .hero-actions a[href="#explore"]:hover > span[aria-hidden="true"] {
    transform: translateY(2px);
  }
  .button:not([href="#explore"]):not([download]):hover > span[aria-hidden="true"] {
    transform: translate(2px, -2px);
  }
  .button[download]:hover > span[aria-hidden="true"] {
    transform: translateY(2px);
  }
  .nav-links a:not(.nav-report):not(.nav-cta):hover::after {
    transform: scaleX(1);
  }
  .nav-toggle:hover,
  .media-caption button:hover,
  .demo-toolbar button:not(:disabled):hover,
  .image-controls button:not(:disabled):hover,
  .image-controls a:hover,
  .dialog-topbar button:hover,
  #back-to-top:hover {
    transform: translateY(-1px);
  }
  .clip-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 18px -11px rgb(29 29 31 / 28%);
  }
  .clip-card:is(.is-active, [aria-pressed="true"]):hover {
    box-shadow: 0 0 0 1px var(--orange), 0 8px 18px -11px rgb(173 66 0 / 24%);
  }
  .figure-card:has(.figure-button:hover) {
    border-color: #dcbca8;
  }
  .figure-button:hover .figure-zoom {
    transform: scale(1.08);
    background: var(--orange-soft);
  }
  .disclosure summary:hover {
    background: #fffcf9;
  }
}

.button:active,
.nav-toggle:active,
.nav-links .nav-report:active,
.nav-links .nav-cta:active,
.media-caption button:active,
.demo-toolbar button:not(:disabled):active,
.image-controls button:not(:disabled):active,
.image-controls a:active,
.dialog-topbar button:active,
#back-to-top:active,
.clip-card:active {
  transform: translateY(1px);
  transition-duration: 90ms;
}
.figure-button:active .figure-zoom {
  transform: scale(.95);
}

dialog[open]::backdrop {
  animation: report-backdrop-in 180ms ease-out both;
}
@keyframes report-backdrop-in {
  from { background-color: rgb(15 15 20 / 0%); backdrop-filter: blur(0); }
  to { background-color: rgb(15 15 20 / 72%); backdrop-filter: blur(5px); }
}
@keyframes report-menu-in {
  from { opacity: .65; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 760px) {
  .nav-links.is-open,
  .site-nav.is-open .nav-links,
  .nav-toggle[aria-expanded="true"] + .nav-links {
    animation: report-menu-in 200ms var(--motion-ease) both;
  }
  .nav-links a:not(.nav-report):not(.nav-cta)::after {
    right: auto;
    left: 5px;
    width: 22px;
    bottom: 5px;
  }
  .training-tabs {
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .hero::before { height: 340px; }
  .hero-tabs { flex-wrap: wrap; }
  .hero-tabs > button { flex: 1 1 auto; }
  .training-tabs {
    gap: 8px;
  }
  .training-tabs > .tab-button {
    min-height: 46px;
    padding: 9px 5px;
    font-size: 10px;
  }
}

/* Preference changes also take effect while the page is open. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .button, .nav-toggle, .nav-links a, .media-caption button,
  .demo-toolbar button, .image-controls button, .image-controls a,
  .dialog-topbar button, #back-to-top, .clip-card, .figure-zoom,
  .button > span[aria-hidden="true"] {
    transform: none !important;
  }
}

@media print {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .hero::before, .tab-indicator, .training-tabs::before {
    display: none !important;
  }
  .training-tabs > .tab-button {
    background: #fff !important;
    border-color: var(--line) !important;
  }
  .training-tabs > .tab-button:is(.is-active, [aria-selected="true"]) {
    border-color: var(--orange) !important;
  }
  .training-module .stage-panel, .figure-card, .disclosure {
    box-shadow: none !important;
  }
}