:root {
  --devstack-ink: #20231c;
  --devstack-body: #55584f;
  --devstack-muted: #75796f;
  --devstack-line: #cfd2c7;
  --devstack-soft-line: #e5e7df;
  --devstack-paper: #ffffff;
  --devstack-bg: #f1f2ed;
  --devstack-accent: #e8a11a;
  --devstack-accent-soft: #fbf3ce;
  --devstack-green: #1f6f54;
  --devstack-green-soft: #e4f0e7;
  --devstack-blue-soft: #e6eef6;
  --devstack-lilac-soft: #eee8f5;
  --devstack-dark: #23251d;
  --devstack-shadow: 0 20px 55px rgba(32,35,28,.10);
}

html { scroll-behavior: smooth; }
body.dev-stack-page {
  margin: 0;
  min-width: 0;
  color: var(--devstack-ink);
  background:
    radial-gradient(circle at 84% 7%, rgba(232,161,26,.11), transparent 30rem),
    linear-gradient(180deg, #f7f7f3 0, var(--devstack-bg) 34rem);
}
body.dev-stack-page * { box-sizing: border-box; }
body.dev-stack-page a { text-underline-offset: .18em; }

.dev-stack-shell {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.dev-stack-skip {
  position: fixed;
  left: 12px;
  top: 10px;
  z-index: 20000;
  transform: translateY(-160%);
  padding: 10px 14px;
  border-radius: 8px;
  color: #fff !important;
  background: var(--devstack-dark);
}
.dev-stack-skip:focus { transform: translateY(0); }

.dev-stack-page .tbi-sitebar { margin-bottom: 0; }

.dev-stack-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(310px, .8fr);
  gap: clamp(26px, 5vw, 72px);
  align-items: center;
  padding: clamp(54px, 8vw, 96px) 0 48px;
}
.dev-stack-hero-copy { min-width: 0; }

.dev-stack-kicker,
.dev-stack-section-kicker,
.dev-stack-card-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: #6b5a2e;
  font: 800 .72rem/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.dev-stack-kicker::before,
.dev-stack-section-kicker::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--devstack-accent);
}

.dev-stack-hero h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 5rem) !important;
  line-height: .98 !important;
  letter-spacing: -.055em !important;
}
.dev-stack-lead {
  max-width: 58ch;
  margin: 24px 0 0;
  color: var(--devstack-body);
  font-size: clamp(1rem, 1.4vw, 1.16rem);
  line-height: 1.85;
}

.dev-stack-apps {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}
.dev-stack-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 6px 11px;
  border: 1px solid var(--devstack-line);
  border-radius: 999px;
  background: rgba(255,255,255,.75);
  color: var(--devstack-ink);
  font-size: .84rem;
  font-weight: 760;
}
.dev-stack-chip::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--devstack-accent);
}
.dev-stack-chip:nth-child(2)::before { background: #20231c; }
.dev-stack-chip:nth-child(3)::before { background: #2b8067; }
.dev-stack-chip:nth-child(4)::before { background: #635bff; }

.dev-stack-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.dev-stack-page .dev-stack-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 16px;
  border-radius: 9px;
  border: 1px solid var(--devstack-dark);
  color: #fff !important;
  background: var(--devstack-dark);
  font-weight: 800;
  text-decoration: none !important;
  cursor: pointer;
}
.dev-stack-page .dev-stack-button.secondary {
  color: var(--devstack-ink) !important;
  background: rgba(255,255,255,.78);
  border-color: var(--devstack-line);
}
.dev-stack-page .dev-stack-button:hover { transform: translateY(-1px); }
.dev-stack-page .dev-stack-button:focus-visible,
.dev-stack-page button:focus-visible,
.dev-stack-page input:focus-visible,
.dev-stack-page a:focus-visible,
.dev-stack-page summary:focus-visible {
  outline: 3px solid #9a6a00;
  outline-offset: 3px;
}
.dev-stack-fine {
  margin-top: 13px;
  color: var(--devstack-muted);
  font-size: .78rem;
}

.dev-stack-preview {
  position: relative;
  min-height: 430px;
  padding: 20px;
  border: 1px solid var(--devstack-line);
  border-radius: 18px;
  background: rgba(255,255,255,.76);
  box-shadow: var(--devstack-shadow);
  overflow: hidden;
}
.dev-stack-preview::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 49.7%, rgba(32,35,28,.035) 50%, transparent 50.3%),
    linear-gradient(transparent 49.7%, rgba(32,35,28,.035) 50%, transparent 50.3%);
  background-size: 34px 34px;
  pointer-events: none;
}
.dev-stack-browser {
  position: relative;
  border: 1px solid #30332b;
  border-radius: 13px;
  background: #11120f;
  color: #f4f5ef;
  overflow: hidden;
}
.dev-stack-browser-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 11px;
  border-bottom: 1px solid #363831;
}
.dev-stack-browser-dot {
  width: 7px; height: 7px; border-radius: 50%; background: #6d7068;
}
.dev-stack-browser-address {
  margin-left: 7px;
  padding: 5px 10px;
  border-radius: 6px;
  background: #1d1f1a;
  color: #b7bbb0;
  font: 600 .68rem/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}
.dev-stack-chat {
  min-height: 270px;
  display: grid;
  align-content: end;
  padding: 24px 18px 18px;
}
.dev-stack-chat-title {
  margin: 0 auto 48px;
  color: #e9ebe3;
  font-size: 1.05rem;
  font-weight: 700;
}
.dev-stack-composer {
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 12px;
  border: 1px solid #343731;
  border-radius: 18px;
  background: #23241f;
}
.dev-stack-composer-top {
  min-height: 34px;
  color: #868b80;
  font-size: .76rem;
}
.dev-stack-composer-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.dev-stack-composer-chips span {
  padding: 5px 7px;
  border-radius: 7px;
  background: #2d2f29;
  color: #d7dbd0;
  font-size: .68rem;
  white-space: nowrap;
}
.dev-stack-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 3px;
  vertical-align: -.15em;
  background: var(--devstack-accent);
  animation: dev-stack-blink 1.15s steps(1) infinite;
}
@keyframes dev-stack-blink { 50% { opacity: 0; } }

.dev-stack-preview-note {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 11px;
  align-items: start;
  margin-top: 15px;
  padding: 13px 14px;
  border-radius: 10px;
  background: var(--devstack-accent-soft);
  color: #50431f;
  font-size: .82rem;
  line-height: 1.6;
}
.dev-stack-preview-note strong {
  display: grid;
  place-items: center;
  width: 24px; height: 24px;
  border: 1px solid #cba958;
  border-radius: 50%;
  font: 800 .72rem/1 ui-monospace, monospace;
}

.dev-stack-resume {
  margin: 0 0 52px;
  padding: 18px 20px;
  border: 1px solid var(--devstack-line);
  border-radius: 12px;
  background: var(--devstack-paper);
}
.dev-stack-resume-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
}
.dev-stack-resume-head strong { font-size: .95rem; }
.dev-stack-resume-head span { color: var(--devstack-muted); font-size: .8rem; }
.dev-stack-progress-track {
  height: 8px;
  margin-top: 12px;
  border-radius: 999px;
  background: #e8eae3;
  overflow: hidden;
}
.dev-stack-progress-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--devstack-green);
  transition: width .2s ease;
}

.dev-stack-section {
  padding: 52px 0;
  border-top: 1px solid var(--devstack-line);
}
.dev-stack-section-head {
  display: grid;
  grid-template-columns: .75fr 1.25fr;
  gap: 28px;
  align-items: end;
  margin-bottom: 28px;
}
.dev-stack-section h2 {
  margin: 0 !important;
  font-size: clamp(1.65rem, 3vw, 2.6rem) !important;
  line-height: 1.1 !important;
}
.dev-stack-section-head > p {
  margin: 0;
  max-width: 60ch;
  color: var(--devstack-body);
}

.dev-stack-mode-grid,
.dev-stack-boundary-grid,
.dev-stack-after-grid {
  display: grid;
  gap: 14px;
}
.dev-stack-mode-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
.dev-stack-after-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.dev-stack-boundary-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }

.dev-stack-card {
  position: relative;
  padding: 22px;
  border: 1px solid var(--devstack-line);
  border-radius: 12px;
  background: var(--devstack-paper);
}
.dev-stack-card.primary { background: linear-gradient(135deg, #fff 0, #f8f1db 100%); }
.dev-stack-card h3 {
  margin: 0 0 9px !important;
  font-size: 1.08rem !important;
}
.dev-stack-card p {
  margin: 0;
  color: var(--devstack-body);
  font-size: .92rem;
}
.dev-stack-card .dev-stack-card-number {
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  margin-bottom: 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--devstack-dark);
  font: 800 .74rem/1 ui-monospace, monospace;
}
.dev-stack-card code {
  word-break: break-word;
}

.dev-stack-checklist {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: setup;
}
.dev-stack-checklist li {
  counter-increment: setup;
  position: relative;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
  padding: 16px 18px 16px 14px;
  border: 1px solid var(--devstack-line);
  border-radius: 11px;
  background: var(--devstack-paper);
}
.dev-stack-checklist li::before {
  content: counter(setup, decimal-leading-zero);
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: #f0f1eb;
  color: var(--devstack-muted);
  font: 800 .72rem/1 ui-monospace, monospace;
}
.dev-stack-check-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: start;
}
.dev-stack-check-row label {
  display: block;
  cursor: pointer;
}
.dev-stack-check-row input {
  width: 20px;
  height: 20px;
  margin: 2px 0 0;
  accent-color: var(--devstack-green);
}
.dev-stack-check-row strong {
  display: block;
  margin-bottom: 4px;
  color: var(--devstack-ink);
}
.dev-stack-check-row p {
  margin: 0;
  color: var(--devstack-body);
  font-size: .87rem;
}
.dev-stack-inline-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.dev-stack-mini-button {
  min-height: 40px;
  padding: 8px 11px;
  border: 1px solid var(--devstack-line) !important;
  border-radius: 8px !important;
  color: var(--devstack-ink) !important;
  background: #fff !important;
  cursor: pointer;
  font-size: .8rem;
  font-weight: 760;
}
.dev-stack-mini-button:hover { border-color: var(--devstack-dark) !important; }
.dev-stack-copy-status { min-height: 1.4em; margin: 6px 0 0; color: var(--devstack-green); font-size: .78rem; }

.dev-stack-setup-footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-top: 14px;
}
.dev-stack-reset {
  border: 0 !important;
  padding: 8px 0 !important;
  color: #5e6259 !important;
  background: transparent !important;
  text-decoration: underline;
  text-underline-offset: .2em;
  cursor: pointer;
  font-size: .8rem;
}
.dev-stack-setup-footer p { margin: 0; color: var(--devstack-muted); font-size: .78rem; }

.dev-stack-boundary {
  min-height: 100%;
}
.dev-stack-boundary.safe { background: var(--devstack-green-soft); }
.dev-stack-boundary.caution { background: var(--devstack-blue-soft); }
.dev-stack-boundary ul {
  margin: 12px 0 0;
  padding-left: 1.25rem;
}
.dev-stack-boundary li { margin: 6px 0; color: var(--devstack-body); font-size: .88rem; }

.dev-stack-troubleshoot {
  display: grid;
  gap: 8px;
}
.dev-stack-troubleshoot details {
  border: 1px solid var(--devstack-line);
  border-radius: 10px;
  background: var(--devstack-paper);
}
.dev-stack-troubleshoot summary {
  padding: 15px 17px;
  cursor: pointer;
  color: var(--devstack-ink);
  font-weight: 760;
}
.dev-stack-troubleshoot details > div {
  padding: 0 17px 17px;
  color: var(--devstack-body);
  font-size: .9rem;
}
.dev-stack-troubleshoot details p { margin: 0; }

.dev-stack-source-list {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}
.dev-stack-source-list a {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--devstack-soft-line);
  color: var(--devstack-ink);
  font-weight: 700;
  text-decoration: none;
}
.dev-stack-source-list a::after { content: "↗"; }

.dev-stack-disclaimer {
  margin-top: 26px;
  padding: 16px 18px;
  border-left: 3px solid var(--devstack-accent);
  background: #fff;
  color: var(--devstack-body);
  font-size: .82rem;
}
.dev-stack-footer {
  padding: 30px 0 44px;
  border-top: 1px solid var(--devstack-line);
  color: var(--devstack-muted);
  font-size: .8rem;
}
.dev-stack-footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
}
.dev-stack-footer a { color: var(--devstack-ink); }

@media (max-width: 820px) {
  .dev-stack-hero { grid-template-columns: 1fr; padding-top: 44px; }
  .dev-stack-preview { min-height: 0; }
  .dev-stack-section-head { grid-template-columns: 1fr; gap: 12px; }
  .dev-stack-mode-grid,
  .dev-stack-boundary-grid { grid-template-columns: 1fr; }
  .dev-stack-after-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .dev-stack-shell { width: min(100% - 20px, 1160px); }
  .dev-stack-hero { gap: 24px; padding-bottom: 34px; }
  .dev-stack-hero h1 { font-size: clamp(2.1rem, 13vw, 3.4rem) !important; }
  .dev-stack-actions { display: grid; grid-template-columns: 1fr; }
  .dev-stack-button { width: 100%; }
  .dev-stack-preview { padding: 10px; border-radius: 12px; }
  .dev-stack-chat { padding: 20px 9px 10px; }
  .dev-stack-chat-title { margin-bottom: 35px; }
  .dev-stack-composer { border-radius: 13px; }
  .dev-stack-composer-chips { gap: 4px; }
  .dev-stack-composer-chips span { font-size: .61rem; padding: 5px; }
  .dev-stack-resume-head { display: block; }
  .dev-stack-resume-head span { display: block; margin-top: 5px; }
  .dev-stack-checklist li { grid-template-columns: 34px 1fr; padding: 13px 12px 13px 9px; }
  .dev-stack-checklist li::before { width: 30px; height: 30px; }
  .dev-stack-check-row { grid-template-columns: 1fr; }
  .dev-stack-check-row input { grid-row: 1; }
  .dev-stack-setup-footer { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dev-stack-cursor { animation: none; }
  .dev-stack-progress-bar,
  .dev-stack-button { transition: none; }
}