/* Shared design system for the Open Battery Information web app.
   Monochrome charcoal surfaces, a single brand-red accent, sharp
   machined geometry (see design.md). */
@import url("https://fonts.googleapis.com/css2?family=Figtree:wght@400;500;600;700;800&family=Saira:wght@500;600;700;800&display=swap");

:root {
  --bg: #1b1a1a;
  --bg-elevated: #262424;
  --bg-input: #201f1f;
  --bg-code: #121111;
  --border: #3a3737;
  --border-strong: #2c2a2a;
  --text: #f5f3f1;
  --text-dim: #a39d9d;
  --accent: #d7282d;
  --accent-hover: #e15a5f;
  --danger: #ff5454;
  --ok: #35c95e;
  --warn: #e0a63c;
  --hover-bg: #2e2c2c;
  --hover-border: #55504f;
  --row-alt: #211f1f;
  --row-hover: #292726;
  --row-selected: #3d2224;
  --feature-tint: #2b2118;
  --log-ok: #7fd98f;
  --log-err: #ff7a7a;
  --log-warn: #e8b45e;
  --log-send: #ff8a8f;
  --radius: 4px;
  --radius-lg: 8px;
  --font-mono: "Cascadia Code", "Consolas", "Menlo", monospace;
}

[data-theme="light"] {
  --bg: #fcfbfb;
  --bg-elevated: #ffffff;
  --bg-input: #f2f0ee;
  --bg-code: #f6f4f3;
  --border: #ded9d6;
  --border-strong: #e7e3e0;
  --text: #222020;
  --text-dim: #585353;
  --accent: #c72026;
  --accent-hover: #a51a1f;
  --danger: #d02828;
  --ok: #128525;
  --warn: #8a6208;
  --hover-bg: #eae6e4;
  --hover-border: #c2bcb9;
  --row-alt: #f6f4f3;
  --row-hover: #efedeb;
  --row-selected: #fbe8e9;
  --feature-tint: #fdf3e3;
  --log-ok: #128525;
  --log-err: #c41e1e;
  --log-warn: #96690a;
  --log-send: #a51a1f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Figtree", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
}

/* ---------- Navbar ---------- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  height: 56px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.navbar .brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}

.navbar .brand .accent { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 4px; }

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-weight: 600;
}

.nav-links a:hover { background: var(--bg-input); color: var(--text); }

.nav-links a.active { color: var(--text); background: var(--bg-input); }

.nav-links a .nav-badge {
  margin-left: 6px;
}

/* ---------- Buttons ---------- */
button {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 16px;
  font-family: "Saira", "Figtree", sans-serif;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.05s;
}

button:hover:not(:disabled) { background: var(--hover-bg); border-color: var(--hover-border); }
button:active:not(:disabled) { transform: translateY(1px); }

button:disabled { opacity: 0.45; cursor: not-allowed; }

button.primary,
button.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.primary:hover:not(:disabled),
button.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

button.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
button.success { background: var(--ok); border-color: var(--ok); color: #fff; }

button.btn-secondary { background: var(--bg-elevated); }
button.btn-ghost { background: transparent; }
button.btn-lg { padding: 13px 26px; font-size: 16px; }
button.btn-block { width: 100%; }

/* ---------- Forms ---------- */
select, input[type="text"], input[type="number"], input[type="checkbox"], input[type="file"], input[type="radio"], input[type="range"] {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 14px;
  accent-color: var(--accent);
}

select { width: 100%; }

select:focus, input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

label.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  margin: 6px 0;
}

.field {
  margin-bottom: 14px;
}

.field > label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.field .hint { font-size: 12px; color: var(--text-dim); margin-top: 6px; }

/* ---------- Status / badges ---------- */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}

.badge.ok { color: var(--ok); border-color: var(--ok); }
.badge.busy { color: var(--warn); border-color: var(--warn); }
.badge.err { color: var(--danger); border-color: var(--danger); }

.status-line { font-size: 13px; color: var(--text-dim); }
.status-line b { color: var(--text); font-weight: 600; }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 92%;
  padding: 20px 22px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.modal h3 { margin: 0 0 8px; font-size: 16px; }
.modal p { margin: 0 0 16px; color: var(--text-dim); line-height: 1.5; white-space: pre-wrap; }
.modal .modal-actions { display: flex; justify-content: flex-end; gap: 10px; }

/* ---------- Toasts ---------- */
.toast-container {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 200;
  pointer-events: none;
}

.toast {
  background: var(--glass-strong);
  border: 1px solid color-mix(in srgb, var(--ok) 60%, transparent);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  box-shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.5);
  font-size: 14px;
  font-weight: 600;
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.toast.toast-error { border-color: color-mix(in srgb, var(--danger) 60%, transparent); }
.toast.toast-out { opacity: 0; transform: translateY(6px); }

/* ---------- Card ---------- */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* ---------- Progress ---------- */
.progress-track {
  height: 10px;
  background: var(--bg-input);
  border-radius: 5px;
  overflow: hidden;
  margin: 12px 0 4px;
}

.progress-track .bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.15s;
}

/* ---------- Log output ---------- */
.log-output {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 260px;
  overflow-y: auto;
  line-height: 1.5;
}

.log-output .l-info { color: var(--text-dim); }
.log-output .l-ok { color: var(--log-ok); }
.log-output .l-err { color: var(--log-err); }
.log-output .l-warn { color: var(--log-warn); }
.log-output .l-send { color: var(--log-send); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
}

.theme-toggle:hover:not(:disabled) { color: var(--text); border-color: var(--hover-border); }

.theme-toggle svg {
  display: block;
  width: 16px;
  height: 16px;
}

/* Navbar icon link (GitHub) */
.nav-links a.nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--glass);
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.nav-links a.nav-icon:hover {
  background: var(--glass);
  border-color: var(--accent-2);
  color: var(--accent-2);
  box-shadow: 0 0 14px var(--glow-1);
}

.nav-links a.nav-icon svg {
  display: block;
  width: 24px;
  height: 24px;
}

/* Burger toggle (hidden on desktop, shown on small screens) */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  padding: 0;
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--glass);
  color: var(--text-dim);
  cursor: pointer;
}

.nav-toggle:hover { border-color: var(--accent-2); color: var(--accent-2); }

.nav-toggle svg {
  display: block;
  width: 20px;
  height: 20px;
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .nav-links {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    display: none;
    background: var(--glass-strong);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
    box-shadow: 0 24px 40px -24px rgba(0, 0, 0, 0.55);
    padding: 8px 12px 14px;
  }

  .navbar.nav-open .nav-links { display: flex; }

  .nav-links a { padding: 12px 12px; }

  .nav-links .theme-toggle,
  .nav-links a.nav-icon { align-self: flex-end; margin-top: 6px; }
}

/* Sun icon (shown in dark mode: clicking switches to light) / moon for light. */
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }

/* ---------- Utilities ---------- */
.muted { color: var(--text-dim); }
.mono { font-family: var(--font-mono); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }

.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
  flex: 1 1 auto;
}

/* ============================================================
   Aurora / glass UI layer (ui-flashy branch, exploratory).
   Everything above the "Flashy UI" marker below is the original
   design; this section layers a richer look on top of it.
   ============================================================ */

:root {
  --accent-1: #e15a5f;
  --accent-2: #d7282d;
  --accent-3: #a52126;
  --grad: linear-gradient(120deg, var(--accent-1), var(--accent-2) 55%, var(--accent-3));
  --glass: color-mix(in srgb, var(--bg-elevated) 82%, transparent);
  --glass-strong: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  --glow-1: rgba(215, 40, 45, 0.3);
  --glow-2: rgba(225, 90, 95, 0.28);
  --radius-xl: 12px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --accent-1: #a51a1f;
  --accent-2: #c72026;
  --accent-3: #8f1519;
  --glass: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  --glass-strong: color-mix(in srgb, var(--bg-elevated) 96%, transparent);
  --glow-1: rgba(215, 40, 45, 0.2);
  --glow-2: rgba(165, 26, 31, 0.16);
}

html { scrollbar-color: var(--hover-border) transparent; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--border), var(--hover-border));
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--hover-border); }

::selection { background: color-mix(in srgb, var(--accent-2) 35%, transparent); }

body {
  background: var(--bg);
}

@keyframes grad-pan { to { background-position: 220% 0; } }

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--glass-strong);
  backdrop-filter: blur(14px) saturate(1.5);
  -webkit-backdrop-filter: blur(14px) saturate(1.5);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  box-shadow: 0 10px 30px -18px rgba(0, 0, 0, 0.5);
}

h1, h2, h3, h4 { font-family: "Saira", "Figtree", sans-serif; }
h1, h2 { font-weight: 700; }
h3, h4 { font-weight: 600; }

.navbar { font-family: "Saira", sans-serif; }
.navbar .brand {
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.navbar .brand .accent {
  color: var(--accent);
}

.nav-links a { position: relative; transition: color 0.2s ease; }
.nav-links a:hover { background: transparent; }
.nav-links a.active { background: transparent; }

.nav-links a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}

.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

/* ---------- Buttons ---------- */
button {
  transition: background 0.18s ease, border-color 0.18s ease, box-shadow 0.25s ease,
    transform 0.12s ease, color 0.18s ease;
}

button.primary,
button.btn-primary {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--accent);
  border: none;
  color: #fff;
  box-shadow: 0 8px 22px -8px var(--glow-1);
  transition: box-shadow 0.3s ease, transform 0.15s ease;
}

button.primary::before,
button.btn-primary::before {
  content: "";
  position: absolute;
  top: -15%;
  left: -45px;
  height: 130%;
  width: 0%;
  transform: skewX(24deg);
  background: var(--accent-3);
  transition: width 0.5s ease;
  z-index: -1;
}

button.primary:hover:not(:disabled)::before,
button.btn-primary:hover:not(:disabled)::before,
button.primary:focus-visible::before,
button.btn-primary:focus-visible::before { width: 160%; }

button.primary:hover:not(:disabled),
button.btn-primary:hover:not(:disabled) {
  box-shadow: 0 12px 30px -10px var(--glow-2);
  transform: translateY(-1px);
}

button.danger {
  box-shadow: 0 8px 22px -10px color-mix(in srgb, var(--danger) 55%, transparent);
}

button.success {
  box-shadow: 0 8px 22px -10px color-mix(in srgb, var(--ok) 55%, transparent);
}

.theme-toggle {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: var(--radius);
  background: var(--glass);
  justify-content: center;
}

.theme-toggle:hover:not(:disabled) {
  border-color: var(--accent-2);
  color: var(--accent-2);
  box-shadow: 0 0 14px var(--glow-1);
}

/* ---------- Cards ---------- */
.card {
  background: var(--glass-strong);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 32px -22px rgba(0, 0, 0, 0.45);
}

/* ---------- Badges ---------- */
.badge {
  border-radius: 2px;
  background: var(--glass);
  border-color: transparent;
  box-shadow: inset 0 0 0 1px var(--border);
}

.badge.ok {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ok) 55%, transparent);
  background: color-mix(in srgb, var(--ok) 12%, transparent);
}

.badge.busy {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--warn) 55%, transparent);
  background: color-mix(in srgb, var(--warn) 12%, transparent);
}

.badge.err {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--danger) 55%, transparent);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

/* ---------- Modal ---------- */
.modal {
  background: var(--glass-strong);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 24px 70px -28px var(--glow-1);
}

/* ---------- Progress ---------- */
.progress-track { background: color-mix(in srgb, var(--bg-input) 80%, transparent); }

.progress-track .bar {
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2), var(--accent-3));
  background-size: 220% 100%;
  box-shadow: 0 0 14px var(--glow-1);
  animation: grad-pan 2.4s linear infinite;
}

/* ---------- Log / inputs ---------- */
.log-output {
  background: color-mix(in srgb, var(--bg-code) 88%, transparent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

select,
input[type="text"],
input[type="number"],
input[type="checkbox"],
input[type="file"],
input[type="radio"],
input[type="range"] {
  background: var(--glass);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="checkbox"],
input[type="radio"] { accent-color: var(--accent); }

select:focus,
input:focus { box-shadow: 0 0 0 3px var(--glow-1); }

/* ---------- Reveal-on-scroll (driven by js/reveal.js) ---------- */
html.js-reveal .reveal {
  opacity: 0;
  transform: translateY(22px);
  will-change: opacity, transform;
}

html.js-reveal .reveal.revealed {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

@media (prefers-reduced-motion: reduce) {
  html.js-reveal .reveal { opacity: 1; transform: none; }
  .navbar .brand .accent,
  .progress-track .bar { animation: none; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 28px 24px;
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-top: auto;
}

.site-footer p { margin: 4px 0; }
.site-footer strong {
  font-family: "Saira", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }