:root {
  --bg: #070b16;
  --card: rgba(19, 27, 46, .72);
  --card-border: rgba(148, 163, 184, .12);
  --text: #e8edf7;
  --muted: #8a97b1;
  --line: rgba(148, 163, 184, .14);
  --charge: #2dd4bf;
  --charge-2: #22c55e;
  --discharge: #f59e0b;
  --discharge-2: #f97316;
  --stop: #94a3b8;
  --off: #64748b;
  --danger: #f43f5e;
  --ok: #34d399;
  --accent: #60a5fa;
  --radius: 22px;
  color-scheme: dark;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; min-height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(60vmax 60vmax at 85% -10%, rgba(45, 212, 191, .16), transparent 60%),
    radial-gradient(50vmax 50vmax at -10% 30%, rgba(96, 165, 250, .12), transparent 60%),
    radial-gradient(60vmax 50vmax at 50% 120%, rgba(245, 158, 11, .08), transparent 60%);
}
[hidden] { display: none !important; }
.muted { color: var(--muted); }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.screen { max-width: 520px; margin: 0 auto; padding: max(16px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom)); }
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px;
  margin-top: 14px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, .25);
}
h2 { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
h2:not(:first-child) { margin-top: 22px; }

/* ---------- login ---------- */
.login { min-height: 100dvh; display: grid; place-items: center; }
.login-card { width: 100%; max-width: 380px; text-align: center; }
.logo { width: 76px; height: 76px; margin: 0 auto 18px; border-radius: 24px; display: grid; place-items: center;
  background: linear-gradient(145deg, rgba(45, 212, 191, .22), rgba(96, 165, 250, .14)); border: 1px solid var(--card-border);
  box-shadow: 0 12px 40px rgba(45, 212, 191, .18); }
.logo svg { width: 46px; height: 46px; }
.logo-body { stroke: var(--text); }
.logo-tip { fill: var(--text); stroke: none; }
.logo-bolt { fill: var(--charge); stroke: none; }
.login h1 { margin: 0; font-size: 26px; letter-spacing: -.02em; }
.login p { margin: 6px 0 26px; }
form { text-align: left; }
.field { display: block; margin-bottom: 14px; }
.field > span { display: block; font-size: 13px; color: var(--muted); margin: 0 0 6px 4px; }
input {
  width: 100%; height: 50px; padding: 0 16px; font: inherit; font-size: 16px; color: var(--text);
  background: rgba(15, 23, 42, .7); border: 1px solid var(--line); border-radius: 14px; outline: none; transition: border-color .2s, box-shadow .2s;
}
input:focus { border-color: rgba(45, 212, 191, .6); box-shadow: 0 0 0 4px rgba(45, 212, 191, .12); }
#totp { letter-spacing: .5em; text-align: center; font-size: 22px; font-variant-numeric: tabular-nums; }
.pw { position: relative; }
.pw input { padding-right: 50px; }
.pw .icon-btn { position: absolute; right: 4px; top: 4px; }
.error { color: var(--danger); min-height: 20px; margin: 4px 4px 10px; font-size: 14px; }
.btn-primary {
  width: 100%; height: 52px; border-radius: 16px; font-weight: 650; font-size: 16px; color: #04241f;
  background: linear-gradient(135deg, var(--charge), var(--charge-2));
  box-shadow: 0 10px 30px rgba(45, 212, 191, .25); transition: transform .12s, filter .2s;
}
.btn-primary:active { transform: scale(.98); }
.btn-primary:disabled { filter: grayscale(.6) brightness(.7); }
.icon-btn { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; color: var(--muted); transition: background .2s, color .2s; }
.icon-btn:hover { background: rgba(148, 163, 184, .1); color: var(--text); }
.icon-btn svg { width: 22px; height: 22px; }

/* ---------- header ---------- */
.top { display: flex; align-items: center; justify-content: space-between; padding: 4px 2px 0; }
.site { font-size: 22px; font-weight: 700; letter-spacing: -.02em; }
.conn { display: flex; align-items: center; gap: 7px; font-size: 13px; color: var(--muted); margin-top: 2px; }
.conn i { width: 8px; height: 8px; border-radius: 50%; background: var(--off); box-shadow: 0 0 0 0 transparent; }
.conn.ok i { background: var(--ok); animation: ping 2s infinite; }
.conn.bad i { background: var(--danger); }
@keyframes ping { 0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, .6); } 100% { box-shadow: 0 0 0 8px rgba(52, 211, 153, 0); } }
.banner { margin-top: 14px; padding: 12px 14px; border-radius: 14px; font-size: 14px; background: rgba(244, 63, 94, .12); border: 1px solid rgba(244, 63, 94, .3); color: #fecdd3; }
.banner.info { background: rgba(96, 165, 250, .1); border-color: rgba(96, 165, 250, .3); color: #dbeafe; }

/* ---------- hero ---------- */
.hero { --c1: var(--stop); --c2: var(--stop); text-align: center; padding-top: 22px; }
.hero[data-state="charge"] { --c1: var(--charge); --c2: var(--charge-2); }
.hero[data-state="discharge"] { --c1: var(--discharge); --c2: var(--discharge-2); }
.hero[data-state="idle"] { --c1: var(--accent); --c2: #818cf8; }
.hero[data-state="off"] { --c1: var(--off); --c2: #475569; }
.hero[data-state="offline"], .hero[data-state="unknown"] { --c1: #475569; --c2: #334155; }
.ring { position: relative; width: min(240px, 68vw); aspect-ratio: 1; margin: 0 auto; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring .g1 { stop-color: var(--c1); }
.ring .g2 { stop-color: var(--c2); }
.ring .track { stroke: rgba(148, 163, 184, .1); stroke-width: 12; }
.ring .fill { stroke: url(#g); stroke-width: 12; stroke-dasharray: 100 100; stroke-dashoffset: 0; transition: stroke-dashoffset 1s ease; filter: drop-shadow(0 0 10px color-mix(in srgb, var(--c1) 50%, transparent)); }
.ring .flow { stroke: var(--c1); stroke-width: 2; opacity: .0; stroke-dasharray: 3 7; }
.hero[data-state="charge"] .flow { opacity: .55; animation: flow 1.4s linear infinite reverse; }
.hero[data-state="discharge"] .flow { opacity: .55; animation: flow 1.4s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -100; } }
.ring-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-icon { width: 34px; height: 34px; color: var(--c1); margin-bottom: 2px; }
.ring-icon svg { width: 100%; height: 100%; }
.ring-value { font-size: 44px; font-weight: 750; letter-spacing: -.03em; font-variant-numeric: tabular-nums; line-height: 1.05; }
.ring-value small { font-size: 20px; font-weight: 600; color: var(--muted); margin-left: 2px; }
.ring-label { font-size: 15px; font-weight: 600; color: var(--c1); margin-top: 4px; }
.hero-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.hero-meta div { display: flex; flex-direction: column; gap: 2px; }
.hero-meta span { font-size: 12px; }
.hero-meta b { font-size: 14px; font-weight: 600; }

.hero-sub { font-size: 13px; margin-top: 12px; min-height: 18px; }
.ring-cap { font-size: 11px; letter-spacing: .06em; text-transform: uppercase; margin-top: 1px; }

/* ---------- battery groups ---------- */
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.card-head h2 { margin: 0; }
.card-head span { font-size: 12px; }
.groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.group { --gc: var(--charge); display: flex; align-items: center; gap: 12px; padding: 12px; border-radius: 16px;
  background: rgba(15, 23, 42, .55); border: 1px solid var(--line); transition: border-color .3s, opacity .3s; }
.group.weakest { --gc: #fbbf24; }
.group.low { --gc: var(--danger); border-color: rgba(244, 63, 94, .45); }
.group.stale { opacity: .5; }
.g-ring { position: relative; width: 64px; height: 64px; flex: none; }
.g-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.g-track { stroke: rgba(148, 163, 184, .12); stroke-width: 9; }
.g-fill { stroke: var(--gc); stroke-width: 9; stroke-dasharray: 100 100; stroke-dashoffset: 100; transition: stroke-dashoffset 1s ease, stroke .3s;
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--gc) 45%, transparent)); }
.g-val { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.g-val b { font-size: 19px; font-weight: 750; font-variant-numeric: tabular-nums; }
.g-val small { font-size: 11px; color: var(--muted); margin-left: 1px; }
.g-info { min-width: 0; }
.g-name { font-weight: 650; font-size: 15px; }
.g-cap { font-size: 12px; }
.g-tag { font-size: 11px; font-weight: 600; color: var(--gc); min-height: 15px; margin-top: 2px; }
.group:not(.weakest):not(.low) .g-tag { display: none; }
.g-name, .g-cap { white-space: nowrap; }
@media (max-width: 1023px) {
  .group { gap: 10px; padding: 10px; }
  .g-ring { width: 54px; height: 54px; }
  .g-val b { font-size: 16px; }
  .g-name { font-size: 14px; }
  .card-head { flex-direction: column; gap: 2px; }
}

/* ---------- alarms ---------- */
.alarms { border-color: rgba(244, 63, 94, .45); background: rgba(76, 5, 25, .45); }
.alarms h2 { color: #fda4af; }
.alarms ul { margin: 0; padding: 0; list-style: none; }
.alarms li { padding: 6px 0 6px 18px; position: relative; font-size: 14px; }
.alarms li::before { content: ""; position: absolute; left: 0; top: 13px; width: 8px; height: 8px; border-radius: 50%; background: var(--danger); animation: blink 1.2s infinite; }
@keyframes blink { 50% { opacity: .25; } }

/* ---------- metrics ---------- */
.metrics { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.metric { padding: 10px 12px; border-radius: 14px; background: rgba(15, 23, 42, .55); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.metric span { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.metric b { font-size: 16px; font-weight: 650; font-variant-numeric: tabular-nums; }

/* ---------- controls ---------- */
.power {
  width: 100%; height: 64px; border-radius: 18px; display: flex; align-items: center; justify-content: center; gap: 12px;
  font-size: 17px; font-weight: 650; border: 1px solid var(--line); background: rgba(15, 23, 42, .6); transition: transform .12s, background .25s, border-color .25s, box-shadow .25s;
}
.power svg { width: 26px; height: 26px; stroke-width: 2.2; }
.power[data-action="on"] { color: var(--ok); border-color: rgba(52, 211, 153, .35); }
.power[data-action="on"]:hover { background: rgba(52, 211, 153, .08); }
.power[data-action="off"] { color: #fda4af; border-color: rgba(244, 63, 94, .35); }
.power[data-action="off"]:hover { background: rgba(244, 63, 94, .08); }
.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.mode {
  --c: var(--stop);
  aspect-ratio: 1 / .92; border-radius: 18px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: 14px; color: var(--muted); border: 1px solid var(--line); background: rgba(15, 23, 42, .6);
  transition: transform .12s, color .25s, background .25s, border-color .25s, box-shadow .25s;
}
.mode svg { width: 30px; height: 30px; }
.mode.charge { --c: var(--charge); }
.mode.discharge { --c: var(--discharge); }
.mode:hover { color: var(--c); }
.mode.active { color: var(--c); border-color: color-mix(in srgb, var(--c) 55%, transparent);
  background: color-mix(in srgb, var(--c) 12%, rgba(15, 23, 42, .6)); box-shadow: 0 8px 28px color-mix(in srgb, var(--c) 22%, transparent), inset 0 0 0 1px color-mix(in srgb, var(--c) 25%, transparent); }
.power:active, .mode:active { transform: scale(.97); }
.power:disabled, .mode:disabled { opacity: .38; pointer-events: none; }

/* ---------- log ---------- */
.log { list-style: none; margin: 0; padding: 0; max-height: 300px; overflow: auto; }
.log li { display: grid; grid-template-columns: 8px 1fr auto; gap: 10px; align-items: baseline; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.log li:last-child { border-bottom: 0; }
.log li::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); transform: translateY(-1px); }
.log li.info::before { background: var(--ok); }
.log li.warn::before { background: var(--discharge); }
.log li.error::before { background: var(--danger); }
.log time { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.log .who { color: var(--muted); font-size: 12px; }
.log .empty { display: block; color: var(--muted); border: 0; }
.log .empty::before { display: none; }

/* ---------- registers ---------- */
.regs summary { cursor: pointer; font-size: 14px; color: var(--muted); list-style: none; display: flex; justify-content: space-between; }
.regs summary::after { content: "▾"; transition: transform .2s; }
.regs[open] summary::after { transform: rotate(180deg); }
.reg-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 12px; }
.reg-grid h3 { font-size: 12px; color: var(--muted); font-weight: 600; margin: 0 0 6px; }
table { width: 100%; border-collapse: collapse; font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
td { padding: 1px 4px; border-bottom: 1px solid var(--line); }
td:first-child { color: var(--muted); }
td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
td.changed { color: var(--charge); }
.foot { text-align: center; font-size: 12px; margin-top: 18px; }

/* ---------- sheet ---------- */
.sheet-wrap { position: fixed; inset: 0; z-index: 20; display: flex; align-items: flex-end; justify-content: center; background: rgba(2, 6, 23, .6); backdrop-filter: blur(4px); animation: fade .2s; }
.sheet { --c: var(--accent); width: 100%; max-width: 520px; padding: 10px 20px max(22px, env(safe-area-inset-bottom)); border-radius: 26px 26px 0 0;
  background: #0f172a; border: 1px solid var(--card-border); border-bottom: 0; text-align: center; animation: up .28s cubic-bezier(.2, .9, .3, 1.1); }
.grip { width: 40px; height: 5px; border-radius: 3px; background: rgba(148, 163, 184, .3); margin: 0 auto 16px; }
.sheet-icon { width: 58px; height: 58px; margin: 0 auto 10px; border-radius: 18px; display: grid; place-items: center; color: var(--c); background: color-mix(in srgb, var(--c) 14%, transparent); }
.sheet-icon svg { width: 30px; height: 30px; }
.sheet h3 { margin: 0 0 6px; font-size: 20px; }
.sheet p { margin: 0 0 20px; font-size: 14px; }
.hold { position: relative; overflow: hidden; width: 100%; height: 58px; border-radius: 16px; font-weight: 650; color: #fff;
  background: color-mix(in srgb, var(--c) 22%, #0b1222); border: 1px solid color-mix(in srgb, var(--c) 50%, transparent); user-select: none; -webkit-user-select: none; touch-action: none; }
.hold i { position: absolute; inset: 0; transform-origin: left; transform: scaleX(0); background: linear-gradient(90deg, color-mix(in srgb, var(--c) 70%, transparent), var(--c)); }
.hold.holding i { transform: scaleX(1); transition: transform 1.2s linear; }
.hold span { position: relative; }
.hold.busy { pointer-events: none; }
.hold.busy span::after { content: ""; display: inline-block; width: 14px; height: 14px; margin-left: 10px; vertical-align: -2px; border: 2px solid #fff; border-right-color: transparent; border-radius: 50%; animation: spin .7s linear infinite; }
.btn-ghost { width: 100%; height: 48px; margin-top: 8px; border-radius: 14px; color: var(--muted); }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes fade { from { opacity: 0; } }
@keyframes up { from { transform: translateY(100%); } }

.toast { position: fixed; left: 50%; bottom: max(24px, env(safe-area-inset-bottom)); transform: translate(-50%, 140%); z-index: 30; max-width: calc(100% - 32px);
  padding: 12px 18px; border-radius: 14px; background: #111a2e; border: 1px solid var(--card-border); box-shadow: 0 10px 40px rgba(0, 0, 0, .4); font-size: 14px;
  visibility: hidden; transition: transform .3s cubic-bezier(.2, .9, .3, 1.1), visibility 0s .3s; }
.toast.show { transform: translate(-50%, 0); visibility: visible; transition: transform .3s cubic-bezier(.2, .9, .3, 1.1); }
.toast.ok { border-color: rgba(52, 211, 153, .4); }
.toast.err { border-color: rgba(244, 63, 94, .5); color: #fecdd3; }

.top-right { display: flex; align-items: center; gap: 12px; }
.clock { font-size: 13px; font-variant-numeric: tabular-nums; display: none; }

/* ---------- desktop dashboard ---------- */
@media (min-width: 1024px) {
  .screen.app {
    max-width: 1480px; padding: 22px 28px 28px;
    display: grid; gap: 16px; align-items: start;
    grid-template-columns: minmax(340px, 400px) 1fr minmax(360px, 440px);
    grid-template-areas:
      "top top top"
      "banner banner banner"
      "alarms alarms alarms"
      "hero groups groups"
      "hero controls controls"
      "tele tele journal"
      "regs regs regs"
      "foot foot foot";
  }
  .app > * { margin: 0 !important; }
  .top { grid-area: top; padding-bottom: 4px; }
  .site { font-size: 26px; }
  .clock { display: inline; }
  .banner { grid-area: banner; }
  .alarms { grid-area: alarms; }
  .hero { grid-area: hero; align-self: stretch; display: flex; flex-direction: column; justify-content: center; padding: 28px 22px; }
  .ring { width: 260px; }
  .groups-card { grid-area: groups; }
  .controls { grid-area: controls; display: grid; grid-template-columns: minmax(220px, 1fr) 2fr; column-gap: 18px; align-items: start; }
  .controls h2 { grid-row: 1; margin-top: 0 !important; }
  .controls .power { grid-row: 2; height: 118px; flex-direction: column; gap: 8px; }
  .controls .modes { grid-row: 2; }
  .mode { aspect-ratio: auto; height: 118px; }
  .telemetry { grid-area: tele; }
  .journal { grid-area: journal; align-self: stretch; }
  .journal .log { max-height: 460px; }
  .regs { grid-area: regs; }
  .foot { grid-area: foot; }

  .groups { grid-template-columns: repeat(4, 1fr); gap: 12px; }
  .group { flex-direction: column; text-align: center; padding: 18px 12px 14px; gap: 10px; }
  .g-ring { width: 104px; height: 104px; }
  .g-val b { font-size: 28px; }
  .g-val small { font-size: 14px; }
  .g-name { font-size: 16px; }

  .metrics { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .metric b { font-size: 18px; }

  .sheet-wrap { align-items: center; }
  .sheet { max-width: 420px; border-radius: 24px; border-bottom: 1px solid var(--card-border); padding-bottom: 22px; animation: pop .22s cubic-bezier(.2, .9, .3, 1.1); }
  .grip { display: none; }
  .sheet-icon { margin-top: 12px; }
  .toast { bottom: 28px; }
}
@media (min-width: 1024px) and (max-width: 1279px) {
  .screen.app { grid-template-columns: 340px 1fr; grid-template-areas:
    "top top" "banner banner" "alarms alarms" "hero groups" "hero controls" "tele tele" "journal journal" "regs regs" "foot foot"; }
}
@keyframes pop { from { transform: scale(.94); opacity: 0; } }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }