/* flash-serial — fresh UI, brand palette ported from the original Volt theme */
:root {
  --c-primary:    #000E22;  /* dark navy — primary buttons, navbar, headings */
  --c-secondary:  #F8BD7A;  /* peach */
  --c-accent:     #424AA0;  /* indigo — links / accents */
  --c-bg:         #EBF4F6;  /* light cyan — page background */
  --c-surface:    #ffffff;
  --c-success:    #05A677;
  --c-info:       #0948B3;
  --c-warning:    #f5b759;
  --c-danger:     #FA5252;
  --c-gray:       #93a5be;
  --c-gray-dark:  #66799e;
  --c-text:       #1a2233;
  --c-muted:      #66799e;
  --c-border:     #e3e9f2;
  --radius:       .6rem;
  --shadow:       0 .25rem 1rem rgba(0, 14, 34, .08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

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

/* ---------- Navbar ---------- */
.navbar {
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: .6rem 1.25rem;
  box-shadow: var(--shadow);
}
.navbar .brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 600;
  color: #fff;
  font-size: 1.05rem;
}
.navbar .brand img { height: 28px; width: auto; display: block; }
.navbar nav { display: flex; gap: .25rem; margin-left: .5rem; }
.navbar nav a {
  color: #c7d2e5;
  padding: .4rem .8rem;
  border-radius: var(--radius);
  font-weight: 500;
}
.navbar nav a:hover { color: #fff; background: rgba(255, 255, 255, .08); text-decoration: none; }
.navbar nav a.active { color: #fff; background: rgba(255, 255, 255, .14); }
.navbar .spacer { flex: 1; }
.navbar .user { color: #c7d2e5; font-size: .9rem; display: flex; align-items: center; gap: .75rem; }

/* ---------- Layout ---------- */
main { flex: 1; width: 100%; max-width: 1080px; margin: 0 auto; padding: 1.75rem 1.25rem; }
.page-title { display: flex; align-items: center; gap: .6rem; margin: 0 0 1.25rem; color: var(--c-primary); }
.page-title svg { width: 26px; height: 26px; }

/* ---------- Card ---------- */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card + .card { margin-top: 1.25rem; }
.card-header {
  display: flex; align-items: center; gap: .55rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--c-border);
  font-weight: 600; color: var(--c-primary);
}
.card-header svg { width: 20px; height: 20px; }
.card-body { padding: 1.25rem; }
.card-body + .card-body { border-top: 1px solid var(--c-border); }

.steps { margin: 0 0 1rem; padding: 0; list-style: none; }
.steps li { padding: .15rem 0; }
.steps li b { color: var(--c-primary); }
.muted { color: var(--c-muted); font-size: .9rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font: inherit; font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: .55rem 1.1rem;
  cursor: pointer;
  transition: background .15s, border-color .15s, opacity .15s;
  background: var(--c-gray); color: #fff;
}
.btn svg { width: 18px; height: 18px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--c-primary); }
.btn-primary:hover:not(:disabled) { background: #001a3f; }
.btn-secondary { background: var(--c-gray-dark); }
.btn-secondary:hover:not(:disabled) { background: #55678c; }
.btn-gray { background: var(--c-gray); }
.btn-gray:hover:not(:disabled) { background: #7f93b1; }
.btn-outline {
  background: transparent; color: var(--c-primary);
  border-color: var(--c-border);
}
.btn-outline:hover:not(:disabled) { background: var(--c-bg); }
.btn-success { background: var(--c-success); }

/* ---------- Forms ---------- */
label { font-weight: 500; }
.field { margin-bottom: 1rem; }
.field > label { display: block; margin-bottom: .35rem; color: var(--c-primary); }
input[type="text"], input[type="number"], input[type="file"], select {
  font: inherit;
  width: 100%;
  padding: .5rem .65rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: #fff; color: var(--c-text);
}
input:focus, select:focus { outline: none; border-color: var(--c-accent); box-shadow: 0 0 0 3px rgba(66, 74, 160, .15); }
.row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end; }
.row > * { flex: 1 1 auto; }
.controls { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.controls .grow { flex: 1 1 220px; }
.check { display: inline-flex; align-items: center; gap: .4rem; white-space: nowrap; }
.check input { width: auto; }

/* ---------- DFU log ---------- */
.log {
  font-family: var(--mono);
  font-size: .85rem;
  margin-top: 1rem;
  max-height: 240px;
  overflow: auto;
}
.log p { margin: .1rem 0; }
.log .info { color: var(--c-text); }
.log .warning { color: #9a6b00; }
.log .error { color: var(--c-danger); }
.log progress { width: 100%; height: 1rem; }

#status { color: var(--c-danger); font-weight: 600; }
#usbInfo, #dfuInfo { font-family: var(--mono); font-size: .8rem; color: var(--c-muted); white-space: pre; }

/* ---------- Serial terminal ---------- */
#terminal {
  height: 58vh;
  background: #06121f;
  border-radius: var(--radius);
  padding: .5rem;
}
.not-supported {
  background: #fff4f4;
  border: 1px solid var(--c-danger);
  color: #8a1f1f;
  border-radius: var(--radius);
  padding: .85rem 1rem;
  margin-bottom: 1rem;
}

/* ---------- Home tiles ---------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.25rem; }
.tile {
  display: flex; flex-direction: column; gap: .6rem;
  padding: 1.5rem; text-decoration: none; color: var(--c-text);
}
.tile:hover { text-decoration: none; transform: translateY(-2px); transition: transform .12s; }
.tile svg { width: 40px; height: 40px; color: var(--c-accent); }
.tile h3 { margin: 0; color: var(--c-primary); }

/* ---------- Login ---------- */
.center-screen { flex: 1; display: flex; align-items: center; justify-content: center; padding: 2rem; }
.login-card { max-width: 380px; width: 100%; text-align: center; }
.login-card .card-body { padding: 2rem; }
.login-card img { height: 44px; margin-bottom: 1rem; }

/* ---------- Toast (Swal shim) ---------- */
.toast-wrap { position: fixed; top: 1rem; right: 1rem; z-index: 9999; display: flex; flex-direction: column; gap: .5rem; }
.toast {
  background: #fff; border-left: 4px solid var(--c-gray);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: .8rem 1.1rem; min-width: 240px;
  animation: toast-in .18s ease-out;
}
.toast.success { border-left-color: var(--c-success); }
.toast.error { border-left-color: var(--c-danger); }
.toast strong { display: block; color: var(--c-primary); }
.toast span { color: var(--c-muted); font-size: .9rem; }
@keyframes toast-in { from { opacity: 0; transform: translateX(12px); } to { opacity: 1; transform: none; } }

/* ---------- Update icon (navbar, top-right) ---------- */
.btn-update {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--c-warning); color: var(--c-primary);
  border: none; border-radius: var(--radius);
  padding: .35rem .75rem;
  font: inherit; font-size: .85rem; font-weight: 700;
  cursor: pointer;
  animation: pulse-update 2s ease-in-out infinite;
}
.btn-update svg { width: 16px; height: 16px; }
.btn-update:hover { background: #e0a53f; }
@keyframes pulse-update {
  0%, 100% { box-shadow: 0 0 0 0 rgba(245, 183, 89, .5); }
  50%       { box-shadow: 0 0 0 6px rgba(245, 183, 89, 0); }
}

/* ---------- Footer ---------- */
.app-footer {
  text-align: left;
  padding: .5rem 1.25rem;
  font-size: .78rem;
  color: var(--c-muted);
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
}

.hidden { display: none !important; }

@media (max-width: 640px) {
  .navbar { gap: .75rem; flex-wrap: wrap; }
  main { padding: 1rem; }
}