/* BambuHelper Web Flasher
   Styled to match the device's own web UI (include/web_pages.h):
   same design tokens - warm light theme by default, dark via
   html[data-theme="dark"], orange accent, cards, sidebar, topbar. */

/* ============ Design tokens (mirrored from web_pages.h) ============ */
:root {
  --accent: #E0623A;
  --accent-soft: rgba(224, 98, 58, 0.16);
  --accent-hover: #E87655;
  --bg: #FAF8F6;
  --bg-elev: #FFFFFF;
  --bg-sub: #F3F0EC;
  --bg-input: #FFFFFF;
  --line: #E1DDD7;
  --line-soft: #ECE9E3;
  --text: #1F1F1E;
  --text-mid: #6A6862;
  --text-dim: #8C8A83;
  --danger: #DC4538;
  --success: #2DA34F;
  --warn: #D89A2C;
  --info: #1F7AD8;
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 20px; --sp-6: 28px; --sp-7: 40px;
  --radius-s: 6px; --radius: 10px; --radius-l: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 6px 24px -8px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.04);
  --sidebar-w: 240px;
  --header-h: 56px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --motion: 180ms cubic-bezier(.2,.6,.2,1);
}
html[data-theme="dark"] {
  --bg: #14171B;
  --bg-elev: #1B1F24;
  --bg-sub: #181C20;
  --bg-input: #21262D;
  --line: #2A2F36;
  --line-soft: #22272D;
  --text: #E6EDF3;
  --text-mid: #B8BFC7;
  --text-dim: #8B949E;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.45);
  --shadow: 0 6px 24px -8px rgba(0,0,0,0.65), 0 1px 2px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ App shell ============ */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  grid-column: 1 / -1;
  height: var(--header-h);
  display: flex; align-items: center;
  padding: 0 var(--sp-5);
  background: var(--bg-elev);
  border-bottom: 1px solid var(--line);
  gap: var(--sp-4);
}
.topbar .hamburger {
  display: none;
  background: transparent; border: 1px solid var(--line);
  width: 36px; height: 36px; border-radius: var(--radius-s);
  cursor: pointer; align-items: center; justify-content: center;
  color: var(--text-mid);
}
.topbar .hamburger:hover { color: var(--text); border-color: var(--text-dim); }
.brand { display: flex; align-items: center; gap: var(--sp-3); font-weight: 600; font-size: 15px; color: var(--text); }
.brand .mark {
  width: 26px; height: 26px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), #B14826);
  display: grid; place-items: center;
  color: white; font-weight: 700; font-size: 13px;
  box-shadow: var(--shadow-sm);
}
.version-pill {
  font-family: var(--mono); font-size: 11px;
  color: var(--text-mid);
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-sub);
}
.section-title { margin-left: var(--sp-2); font-size: 14px; color: var(--text-mid); font-weight: 500; }
.section-title::before { content: ""; display: inline-block; width: 1px; height: 16px; background: var(--line); margin-right: var(--sp-4); vertical-align: middle; }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: var(--sp-2); }
.icon-btn {
  width: 34px; height: 34px;
  border-radius: var(--radius-s);
  border: 1px solid transparent;
  background: transparent; color: var(--text-mid);
  display: grid; place-items: center; cursor: pointer;
  transition: background var(--motion), color var(--motion), border-color var(--motion);
}
.icon-btn:hover { background: var(--bg-sub); color: var(--text); border-color: var(--line); }
.icon-btn svg { width: 18px; height: 18px; }
html:not([data-theme="dark"]) .icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }

/* ============ Sidebar ============ */
.sidebar {
  border-right: 1px solid var(--line);
  background: var(--bg-sub);
  padding: var(--sp-5) var(--sp-3);
  overflow-y: auto;
  position: sticky; top: var(--header-h);
  align-self: start;
  height: calc(100vh - var(--header-h));
  display: flex; flex-direction: column;
}
.sidebar h4 {
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-dim);
  padding: var(--sp-3) var(--sp-3) var(--sp-2);
  margin: 0;
}
.nav-item {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-2);
  padding: 9px var(--sp-3);
  margin-bottom: 2px;
  border-radius: var(--radius-s);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-mid);
  text-align: left;
  font-size: 13.5px;
  cursor: pointer;
  position: relative;
  text-decoration: none;
  transition: background var(--motion), color var(--motion);
}
.nav-item:hover { background: var(--bg-elev); color: var(--text); text-decoration: none; }
.nav-item[aria-current="true"] { background: var(--bg-elev); color: var(--text); font-weight: 600; box-shadow: var(--shadow-sm); }
.nav-item[aria-current="true"]::before { content: ""; position: absolute; left: -3px; top: 8px; bottom: 8px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); }
.nav-item .ext { color: var(--text-dim); font-size: 11px; }
.sidebar-footer { margin-top: auto; padding: var(--sp-3); font-size: 11px; color: var(--text-dim); font-family: var(--mono); border-top: 1px solid var(--line-soft); }
.sidebar-backdrop { display: none; }

/* ============ Main ============ */
.main { padding: var(--sp-6) var(--sp-7); max-width: 880px; width: 100%; min-width: 0; }

.section-intro { margin: 0 0 var(--sp-5); }
.section-intro h2 { margin: 0 0 4px; font-size: 22px; font-weight: 600; letter-spacing: -0.015em; }
.section-intro p { margin: 0; color: var(--text-dim); font-size: 13.5px; max-width: 68ch; }

/* ============ Cards ============ */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: var(--sp-5) var(--sp-6);
  margin-bottom: var(--sp-5);
  box-shadow: var(--shadow-sm);
}
.card-head { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: var(--sp-4); gap: var(--sp-4); }
.card-head h3 { margin: 0; font-size: 15px; font-weight: 600; color: var(--text); scroll-margin-top: calc(var(--header-h) + 16px); }
.card-head p { margin: 4px 0 0; font-size: 12.5px; color: var(--text-dim); }
.help-text { margin: 4px 0 14px; font-size: 12.5px; color: var(--text-dim); line-height: 1.45; }

/* ============ Browser support callout ============ */
.browser-callout {
  display: none;
  margin: 0 0 var(--sp-5);
  padding: 12px 16px;
  border: 1px solid var(--warn);
  background: var(--bg-elev);
  border-radius: var(--radius);
  color: var(--text-mid);
  font-size: 13px;
  gap: var(--sp-3);
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
}
.browser-callout.show { display: flex; }
.browser-callout strong { color: var(--text); display: block; margin-bottom: 2px; }
.browser-callout .pulse {
  flex: none;
  width: 8px; height: 8px;
  margin-top: 6px;
  border-radius: 999px;
  background: var(--warn);
  box-shadow: 0 0 0 4px rgba(216, 154, 44, 0.15);
}

/* ============ Checklist ============ */
.checklist { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.checklist li {
  position: relative;
  padding-left: 24px;
  font-size: 13.5px;
  color: var(--text-mid);
  max-width: 72ch;
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 4px; top: 7px;
  width: 7px; height: 7px;
  border-radius: 999px;
  background: var(--accent);
  opacity: 0.7;
}
.checklist li strong { color: var(--text); font-weight: 600; margin-right: 4px; }

/* ============ Board select ============ */
.field { margin-bottom: var(--sp-4); }
.field > label {
  display: block;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-mid);
  margin: 0 0 6px;
}
.select-wrap { position: relative; max-width: 560px; }
.select-wrap::after {
  content: "";
  position: absolute;
  right: 13px; top: 50%;
  width: 7px; height: 7px;
  border-right: 1.5px solid var(--text-dim);
  border-bottom: 1.5px solid var(--text-dim);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}
select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  padding: 9px 32px 9px 12px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line);
  background: var(--bg-input);
  color: var(--text);
  font-size: 13.5px;
  cursor: pointer;
  outline: none;
  transition: border-color var(--motion), box-shadow var(--motion);
}
select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ============ Board card ============ */
.board-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--sp-5);
  margin: 0 0 var(--sp-4);
  padding: var(--sp-4);
  background: var(--bg-sub);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.board-photo {
  width: 220px; height: 220px;
  border-radius: var(--radius-s);
  border: 1px solid var(--line);
  background: #FFFFFF;
  display: grid; place-items: center;
  overflow: hidden;
}
.board-photo img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}
.board-info { min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.board-title-row { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.board-title-row h4 { margin: 0; font-size: 15px; font-weight: 600; color: var(--text); }
.badge {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--text-dim);
  white-space: nowrap;
}
.badge-diy { color: var(--accent); border-color: var(--accent-soft); background: var(--accent-soft); }
.board-desc { margin: 0; font-size: 13px; color: var(--text-mid); max-width: 62ch; }
.board-note { margin: 0; font-size: 12.5px; color: var(--warn); }

.specs { margin: 0; display: flex; flex-direction: column; gap: 5px; }
.spec-row {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 12px;
  align-items: baseline;
  font-size: 12.5px;
}
.spec-row dt {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
}
.spec-row dd { margin: 0; color: var(--text); word-break: break-word; }
.spec-row dd.mono { font-family: var(--mono); font-size: 12px; }

.board-links { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 12.5px; margin-top: auto; }
.board-links a { color: var(--accent); }
.board-links .credit { color: var(--text-dim); }
.board-links .credit a { color: var(--text-mid); }

/* ============ Status + install ============ */
.status-line {
  margin: 0 0 var(--sp-3);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-dim);
  max-width: 62ch;
}
.status-line.error { color: var(--danger); }
.status-line.warn  { color: var(--warn); }
.status-line.ok    { color: var(--success); }
.status-line:empty { display: none; }

.install-row { display: flex; flex-direction: column; gap: var(--sp-3); }
#install-slot {
  --esp-tools-button-color: var(--accent);
  --esp-tools-button-text-color: #FFFFFF;
  display: flex;
  align-items: center;
  min-height: 40px;
}
#install-slot esp-web-install-button { display: inline-block; }
esp-web-install-button::part(button) { font-family: var(--sans) !important; }

.hint { color: var(--text-dim); font-size: 12.5px; margin: 0; max-width: 68ch; }
.unsupported { color: var(--danger); font-size: 13px; }

/* ============ After-flash paths ============ */
.path { margin: 0; }
.path-head { display: flex; align-items: center; gap: var(--sp-3); flex-wrap: wrap; margin-bottom: 8px; }
.path-head h4 { margin: 0; font-size: 14px; font-weight: 600; color: var(--text); }
.path-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 2px 9px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid transparent;
  border-radius: 999px;
}
.path-tag-muted { color: var(--text-dim); background: var(--bg-sub); border-color: var(--line); }
.path-timer {
  display: inline-flex; align-items: center; gap: 6px;
  margin-left: auto;
  padding: 2px 9px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  background: var(--bg-sub);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.path-pulse {
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--accent);
  animation: path-pulse 1.8s ease-out infinite;
}
@keyframes path-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(224, 98, 58, 0.4); }
  100% { box-shadow: 0 0 0 8px rgba(224, 98, 58, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .path-pulse { animation: none; }
}
.path-body { margin: 0 0 var(--sp-3); max-width: 68ch; color: var(--text-mid); font-size: 13.5px; }
.path-body strong { color: var(--text); font-weight: 600; }

.path-divider {
  display: flex; align-items: center; gap: 14px;
  margin: var(--sp-5) 0;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.path-divider::before, .path-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}

/* ============ Credentials block ============ */
.creds {
  margin: 0 0 var(--sp-4);
  max-width: 480px;
  background: var(--bg-sub);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.creds-head {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-elev);
}
.creds-dot { width: 8px; height: 8px; border-radius: 999px; background: var(--accent); }
.creds-title {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}
.creds-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 13px;
  border-bottom: 1px dashed var(--line);
}
.creds-row:last-of-type { border-bottom: 0; }
.creds-key { color: var(--text-dim); font-size: 11px; }
.creds-val { color: var(--text); word-break: break-all; }
.creds-val .dim { color: var(--text-dim); }
.creds-note {
  margin: 0;
  padding: 8px 14px 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg-elev);
  border-top: 1px solid var(--line);
}

/* ============ Step list ============ */
.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 var(--sp-3);
  display: flex; flex-direction: column; gap: 10px;
}
.step-list li {
  counter-increment: step;
  position: relative;
  padding-left: 32px;
  min-height: 22px;
  max-width: 72ch;
  font-size: 13.5px;
  color: var(--text-mid);
}
.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: var(--radius-s);
  width: 21px; height: 21px;
  display: inline-grid;
  place-items: center;
}
.step-list code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--bg-sub);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ============ Buttons (device-UI style) ============ */
.btn {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-s);
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #FFFFFF;
  cursor: pointer;
  transition: background var(--motion), border-color var(--motion), opacity var(--motion);
}
.btn:hover:not(:disabled) { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.btn-ghost {
  background: transparent;
  color: var(--text-mid);
  border-color: var(--line);
}
.btn.btn-ghost:hover:not(:disabled) { background: var(--bg-sub); color: var(--text); }

/* ============ Serial monitor ============ */
.monitor-row { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-3); }
.monitor-output {
  margin: 0 0 var(--sp-3);
  padding: 12px 14px;
  background: var(--bg-input);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-all;
  height: 300px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.monitor-output::-webkit-scrollbar { width: 6px; }
.monitor-output::-webkit-scrollbar-thumb { background: var(--line); border-radius: 999px; }
.monitor-output:empty::before {
  content: "Waiting for connection...";
  color: var(--text-dim);
}

/* ============ Footer ============ */
.footer {
  margin-top: var(--sp-6);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-3);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11.5px;
  flex-wrap: wrap;
}
.footer a { color: var(--text-mid); }
.footer a:hover { color: var(--text); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============ Responsive ============ */
@media (max-width: 920px) {
  .main { padding: var(--sp-5) var(--sp-5); }
  .board-card { grid-template-columns: 170px 1fr; }
  .board-photo { width: 170px; height: 170px; }
}

@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; }
  .topbar .hamburger { display: inline-flex; }
  .section-title { display: none; }
  .sidebar {
    position: fixed;
    top: var(--header-h); left: 0; bottom: 0;
    width: var(--sidebar-w);
    z-index: 40;
    transform: translateX(-100%);
    transition: transform var(--motion);
    box-shadow: none;
    height: auto;
  }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow); }
  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: var(--header-h) 0 0 0;
    z-index: 35;
    background: rgba(0,0,0,0.35);
  }
  .sidebar-backdrop.show { display: block; }
  .board-card { grid-template-columns: 1fr; }
  .board-photo { width: 100%; height: 200px; }
  .card { padding: var(--sp-4) var(--sp-4); }
}

@media (max-width: 480px) {
  .main { padding: var(--sp-4) var(--sp-3); }
  .spec-row, .creds-row { grid-template-columns: 80px 1fr; gap: 10px; }
  .version-pill { display: none; }
}