:root {
  color-scheme: dark;
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  background: #0a1114;
  color: #e4eceb;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --bg: #0a1114;
  --panel: #101b1f;
  --panel-raised: #142226;
  --line: #26383c;
  --muted: #93a6a7;
  --faint: #647a7d;
  --teal: #59e0c2;
  --teal-dim: #173e3a;
  --amber: #e9b46d;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  margin: 0;
  background:
    radial-gradient(ellipse at 14% -12%, rgb(38 110 101 / 18%), transparent 38rem),
    var(--bg);
  line-height: 1.55;
}

button, input, select { font: inherit; }
button, select, input { color: inherit; }
button:focus-visible, select:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

code, kbd { color: #c7f8eb; font-size: .92em; }
kbd {
  border: 1px solid #496064;
  border-radius: 4px;
  padding: .12rem .3rem;
  white-space: nowrap;
}

.page-shell { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 10;
  padding: .6rem .8rem;
  background: var(--teal);
  color: #071211;
}
.skip-link:focus { top: 1rem; }

.topbar, .footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: .68rem;
  letter-spacing: .09em;
}
.wordmark { display: inline-flex; align-items: center; gap: .7rem; color: #dce8e6; text-decoration: none; font-weight: 700; }
.wordmark-mark {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid var(--teal);
  color: var(--teal);
  font-size: .82rem;
}
.wordmark-divider { color: var(--faint); }
.topbar-note { display: flex; align-items: center; gap: .55rem; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 10px rgb(233 180 109 / 45%); }

.intro { max-width: 720px; padding: 64px 0 32px; }
.eyebrow { margin: 0 0 .75rem; color: var(--teal); font-size: .65rem; font-weight: 700; letter-spacing: .13em; }
.eyebrow span { color: var(--faint); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: .7rem; font-size: clamp(2.3rem, 6vw, 4.5rem); line-height: 1.06; letter-spacing: -.075em; }
h1 span { color: var(--teal); }
.intro-copy { max-width: 590px; margin-bottom: 1rem; color: #a9b9b8; font-size: .95rem; }
.experimental-note { display: inline-block; margin: 0; border-left: 2px solid var(--amber); padding: .32rem .7rem; color: #bdc7c4; font-size: .72rem; }
.experimental-note strong { color: var(--amber); }
.experimental-note a { color: var(--amber); }

.workspace { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(270px, .85fr); align-items: start; gap: 22px; }
.flash-card, .guide-card, .coming-card { border: 1px solid var(--line); background: rgb(16 27 31 / 92%); }
.flash-card { padding: clamp(20px, 3vw, 34px); }
.card-heading, .build-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; }
.card-heading { margin-bottom: 28px; }
.card-heading .eyebrow, .build-card-heading .eyebrow { margin-bottom: .4rem; }
.card-heading h2, .guide-card h2, .build-card h2, .coming-card h2 { margin-bottom: 0; font-size: 1.15rem; letter-spacing: -.045em; }
.version-chip, .activity-label { border: 1px solid var(--line); padding: .32rem .48rem; color: var(--muted); font-size: .58rem; letter-spacing: .1em; white-space: nowrap; }

.form-step { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 12px; border-top: 1px solid var(--line); padding: 20px 0; }
.step-index { padding-top: .15rem; color: var(--faint); font-size: .67rem; }
.field-label { display: block; margin-bottom: .55rem; font-size: .75rem; font-weight: 700; }
.device-row { display: flex; gap: 9px; }
select {
  min-width: 0;
  flex: 1;
  border: 1px solid #395054;
  border-radius: 0;
  padding: .72rem .8rem;
  background: #0d171a;
  font-size: .72rem;
}
.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  border: 1px solid transparent;
  border-radius: 0;
  padding: .68rem .9rem;
  cursor: pointer;
  font-size: .7rem;
  font-weight: 700;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.button-secondary { border-color: #496064; background: transparent; color: #d7e4e2; white-space: nowrap; }
.button-secondary:hover { border-color: var(--teal); color: var(--teal); }
.button-primary { width: 100%; border-color: var(--teal); background: var(--teal); color: #071412; }
.button-primary:hover:not(:disabled) { border-color: #91f1da; background: #91f1da; }
.button:disabled { border-color: #304145; background: #263437; color: #839291; cursor: not-allowed; }
.field-help { margin: .55rem 0 0; color: var(--muted); font-size: .67rem; line-height: 1.65; }

.file-picker {
  display: flex;
  min-height: 70px;
  align-items: center;
  gap: .8rem;
  border: 1px dashed #496064;
  padding: .75rem .9rem;
  background: #0d171a;
  cursor: pointer;
}
.file-picker:hover { border-color: var(--teal); }
.file-picker-icon { color: var(--teal); font-size: 1.25rem; }
.file-picker strong, .file-picker small { display: block; }
.file-picker strong { font-size: .72rem; }
.file-picker small { margin-top: .2rem; color: var(--muted); font-size: .62rem; }
.file-picker input { max-width: 45%; margin-left: auto; color: var(--muted); font-size: .62rem; }
.file-picker input::file-selector-button { margin-right: .5rem; border: 1px solid #496064; padding: .4rem .5rem; background: #152326; color: #dce8e6; font: inherit; cursor: pointer; }
.selected-files { display: grid; gap: .3rem; margin: .65rem 0 0; padding: 0; list-style: none; }
.selected-files li { display: flex; justify-content: space-between; gap: .5rem; color: #c2d2cf; font-size: .65rem; overflow-wrap: anywhere; }
.empty-files { color: var(--faint) !important; }
.risk-step { padding-bottom: 14px; }
.risk-check { display: flex; align-items: flex-start; gap: .7rem; color: #e8d7bd; font-size: .7rem; line-height: 1.6; cursor: pointer; }
.risk-check input { width: 17px; height: 17px; flex: 0 0 auto; margin: .05rem 0 0; accent-color: var(--teal); }
.connect-row { margin-bottom: 20px; }
.flash-actions { border-top: 1px solid var(--line); padding-top: 20px; }
.status { min-height: 1.3rem; margin: .7rem 0 0; color: var(--muted); font-size: .65rem; }
.progress-row { display: flex; align-items: center; gap: .8rem; margin-top: .5rem; color: var(--teal); font-size: .65rem; }
progress { width: 100%; height: 5px; appearance: none; border: 0; background: #27383b; }
progress::-webkit-progress-bar { background: #27383b; }
progress::-webkit-progress-value { background: var(--teal); }
progress::-moz-progress-bar { background: var(--teal); }

.activity { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 16px; }
.activity-heading { display: flex; align-items: center; justify-content: space-between; }
.activity-heading h3 { margin: 0; font-size: .72rem; }
.activity-label { border: 0; color: var(--faint); }
#activity-log { min-height: 42px; margin: .65rem 0 0; padding: .55rem .75rem .55rem 1.9rem; border: 1px solid #1d2b2e; background: #0b1316; color: #91a4a3; font-size: .62rem; }
#activity-log li { padding: .12rem 0; }

.side-column { display: grid; gap: 14px; }
.guide-card, .coming-card { padding: 21px; }
.guide-card h2 { margin-bottom: 1.2rem; }
.guide-card > p { color: #a8b8b6; font-size: .75rem; line-height: 1.7; }
.checksum-note code { overflow-wrap: anywhere; font-size: .75rem; }
.guide-list { display: grid; gap: 1rem; margin: 0; padding: 0; list-style: none; }
.guide-list li { display: grid; grid-template-columns: 25px 1fr; gap: .55rem; }
.guide-list li > span { color: var(--teal); font-size: .65rem; }
.guide-list p, .coming-card p { margin: 0; color: #a8b8b6; font-size: .68rem; line-height: 1.7; }
.guide-warning { display: flex; align-items: flex-start; gap: .65rem; margin-top: 1.2rem; border-top: 1px solid var(--line); padding-top: 1rem; }
.guide-warning > span { display: grid; width: 18px; height: 18px; flex: 0 0 auto; place-items: center; border: 1px solid var(--amber); color: var(--amber); font-size: .65rem; }
.guide-warning p { margin: 0; color: #e4c99f; font-size: .65rem; }
.build-card-heading { align-items: center; }
.build-mark { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid #2e6c61; color: var(--teal); font-size: .8rem; }
.build-card > p { margin: 1rem 0; color: #a8b8b6; font-size: .67rem; line-height: 1.7; }
.login-note { border-top: 1px solid var(--line); padding-top: .85rem; }
.login-label, .coming-status { color: var(--amber); font-size: .58rem; font-weight: 700; letter-spacing: .11em; }
.login-note p { margin: .4rem 0 0; color: #a8b8b6; font-size: .65rem; line-height: 1.7; }
.coming-card { border-color: #2d3b3e; background: #0d171a; }
.coming-card h2 { margin: .45rem 0 .5rem; font-size: .9rem; }
.coming-card p { font-size: .63rem; }
.footer { min-height: 62px; margin-top: 36px; border-top: 1px solid var(--line); border-bottom: 0; color: var(--faint); font-size: .58rem; }

@media (max-width: 820px) {
  .workspace { grid-template-columns: 1fr; }
  .side-column { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-card { grid-row: span 2; }
}

@media (max-width: 560px) {
  .page-shell { width: min(100% - 28px, 520px); }
  .topbar { min-height: 58px; font-size: .58rem; }
  .intro { padding: 46px 0 24px; }
  .intro-copy { font-size: .84rem; }
  .experimental-note { font-size: .65rem; }
  .flash-card { padding: 18px 15px; }
  .card-heading { align-items: center; margin-bottom: 20px; }
  .version-chip { font-size: .5rem; }
  .form-step { grid-template-columns: 22px minmax(0, 1fr); gap: 7px; }
  .device-row { flex-direction: column; }
  .button-secondary { width: 100%; }
  .file-picker { flex-wrap: wrap; }
  .file-picker input { width: 100%; max-width: 100%; margin-left: 0; }
  .side-column { grid-template-columns: 1fr; }
  .guide-card { grid-row: auto; }
  .footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: .2rem; padding: .7rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}
.confirmation-label { margin: 1rem 0 .45rem; }
.confirmation-input {
  width: 100%;
  border: 1px solid #496064;
  border-radius: 0;
  padding: .7rem .75rem;
  background: #0d171a;
  font-size: .72rem;
  letter-spacing: .08em;
}
.confirmation-input::placeholder { color: #647a7d; }
.download-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .45rem;
  margin-top: .9rem;
  border: 1px solid #2e6c61;
  padding: .65rem .7rem;
  color: var(--teal);
  font-size: .65rem;
  text-decoration: none;
}
.download-link:hover { background: #112522; }
.download-link span:first-of-type { margin-left: auto; color: var(--muted); font-size: .58rem; }
.checksum-note { margin: .55rem 0 1rem !important; color: var(--muted) !important; font-size: .58rem !important; overflow-wrap: anywhere; }

.s9-panel { display: grid; gap: 18px; }
.s9-card > * + * { margin-top: 14px; }
.s9-steps { margin-top: 14px; }

.download-button { width: 100%; margin-bottom: 10px; }