*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0f0f0f;
  --bg2:      #181818;
  --bg3:      #222;
  --border:   #2a2a2a;
  --amber:    #f59e0b;
  --amber2:   #fbbf24;
  --red:      #ef4444;
  --green:    #22c55e;
  --muted:    #555;
  --text:     #e5e5e5;
  --text2:    #999;
  --mono:     'Share Tech Mono', monospace;
  --sans:     'Barlow Condensed', sans-serif;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100dvh;
  overscroll-behavior: none;
}

/* ── LOGIN ── */
.login-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 2rem;
}
.login-overlay.hidden { display: none; }

.login-box {
  width: 100%; max-width: 340px;
  display: flex; flex-direction: column; gap: 1rem;
  animation: fadeUp .4s ease;
}
.login-logo {
  font-size: 3rem; color: var(--amber);
  text-align: center; margin-bottom: .5rem;
  animation: pulse 2s ease infinite;
}
.login-box h2 {
  font-family: var(--sans); font-size: 2rem; font-weight: 700;
  letter-spacing: .3em; text-align: center; color: var(--text);
}
.login-sub {
  text-align: center; color: var(--text2); font-size: .9rem;
  letter-spacing: .1em; text-transform: uppercase;
}
.login-box input {
  background: var(--bg2); border: 1px solid var(--border);
  color: var(--text); padding: .9rem 1rem;
  font-family: var(--mono); font-size: .95rem;
  outline: none; transition: border-color .2s;
  border-radius: 2px;
}
.login-box input:focus { border-color: var(--amber); }
.login-error {
  color: var(--red); font-size: .85rem; text-align: center;
  letter-spacing: .05em;
}
.login-error.hidden { display: none; }
.login-box button {
  background: var(--amber); color: #000;
  border: none; padding: 1rem;
  font-family: var(--sans); font-size: 1rem; font-weight: 700;
  letter-spacing: .2em; cursor: pointer;
  transition: background .2s; border-radius: 2px;
}
.login-box button:hover { background: var(--amber2); }

/* ── PROGRESS BAR ── */
.progress-bar {
  height: 2px; background: var(--border);
}
.progress-fill {
  height: 100%; width: 0%;
  background: var(--amber);
  transition: width linear;
}
.progress-fill.flash {
  background: #fff;
}

/* ── LAYOUT ── */
.app {
  max-width: 420px; margin: 0 auto;
  padding: 0 0 2rem;
  display: flex; flex-direction: column; gap: 0;
}

/* ── HEADER ── */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
.header-left { display: flex; align-items: center; gap: .6rem; }
.logo { font-size: 1.4rem; color: var(--amber); }
.header-title {
  font-size: 1.1rem; font-weight: 700;
  letter-spacing: .25em; color: var(--text);
}
.header-right { display: flex; align-items: center; gap: .75rem; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--muted); transition: background .5s;
}
.status-dot.ok  { background: var(--green); box-shadow: 0 0 6px var(--green); }
.status-dot.err { background: var(--red);   box-shadow: 0 0 6px var(--red); }
.install-btn {
  background: transparent; border: 1px solid var(--border);
  color: var(--text2); padding: .3rem .7rem;
  font-family: var(--sans); font-size: .8rem; letter-spacing: .1em;
  cursor: pointer; transition: border-color .2s, color .2s;
}
.install-btn:hover { border-color: var(--amber); color: var(--amber); }
.install-btn.hidden { display: none; }
.logout-btn {
  background: transparent; border: none;
  color: var(--muted); font-size: 1.2rem; cursor: pointer;
  transition: color .2s;
  padding: .5rem; min-width: 44px; min-height: 44px;
  display: flex; align-items: center; justify-content: center;
}
.logout-btn:hover { color: var(--red); }

/* ── READINGS ── */
.readings {
  padding: 1.25rem 1rem 0.75rem;
  display: flex; flex-direction: column; gap: 1rem;
}
.reading-card {
  background: var(--bg2); border: 1px solid var(--border);
  padding: 1rem 1.1rem;
  position: relative; overflow: hidden;
}
.reading-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--amber);
}
.reading-card.primary { padding: 1.4rem 1.1rem; }
.reading-card.primary::before { width: 4px; }
.reading-label {
  font-size: .7rem; letter-spacing: .2em;
  color: var(--text2); margin-bottom: .3rem;
}
.reading-value-row {
  display: flex; align-items: baseline; gap: .15rem;
}
.reading-value {
  font-family: var(--mono); font-size: 3.5rem;
  color: var(--amber); line-height: 1;
  transition: color .3s;
}
.reading-value.small { font-size: 2.2rem; }
.reading-unit {
  font-family: var(--mono); font-size: .75rem;
  color: var(--text2);
}
.reading-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}

/* ── BRENNER BAR ── */
.brenner-bar {
  display: flex; align-items: center; gap: .75rem;
  background: var(--bg2); border: 1px solid var(--border);
  padding: .75rem 1.1rem;
  font-size: .85rem; letter-spacing: .1em;
  color: var(--text2); font-family: var(--sans);
  transition: background .4s, border-color .4s;
}
.brenner-bar.active {
  background: #1a1200;
  border-color: var(--amber);
}
.brenner-icon {
  font-size: 1rem; color: var(--muted);
  transition: color .4s;
}
.brenner-bar.active .brenner-icon { color: var(--amber); animation: pulse 1s ease infinite; }

.mode-badges {
  margin-left: auto;
  display: flex; align-items: center; gap: .35rem;
}
.mode-badge-label {
  font-size: .65rem; letter-spacing: .1em; color: var(--muted);
}
.mode-badge {
  background: var(--bg3); border: 1px solid var(--border);
  padding: .2rem .6rem; font-size: .75rem;
  letter-spacing: .1em; color: var(--text);
}

/* ── DETAILS TOGGLE ── */
.details-toggle {
  background: transparent; border: none;
  color: var(--text2); font-family: var(--sans);
  font-size: .8rem; letter-spacing: .15em;
  cursor: pointer; padding: .25rem 0;
  text-align: left; transition: color .2s;
}
.details-toggle:hover { color: var(--amber); }

.details-section {
  overflow: hidden;
  max-height: 400px;
  transition: max-height .3s ease, opacity .3s ease;
  opacity: 1;
}
.details-section.collapsed {
  max-height: 0;
  opacity: 0;
}

/* ── MODES ── */
.modes-section {
  padding: .75rem 1rem 0;
}
.modes-title {
  font-size: .7rem; letter-spacing: .25em; color: var(--text2);
  margin-bottom: .75rem;
}
.modes-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: .5rem;
}
.mode-btn {
  background: var(--bg2); border: 1px solid var(--border);
  color: var(--text2); padding: 1rem .5rem;
  font-family: var(--sans); font-size: .95rem; font-weight: 600;
  letter-spacing: .1em; cursor: pointer; min-height: 52px;
  transition: all .15s; text-transform: uppercase;
  border-radius: 2px;
}
.mode-btn:hover  { border-color: var(--amber); color: var(--amber); background: #1a1200; }
.mode-btn.active { border-color: var(--amber); color: #000; background: var(--amber); }

/* ── MESSAGE ── */
.message {
  margin: .75rem 1rem 0;
  padding: .6rem 1rem;
  font-size: .8rem; letter-spacing: .1em; color: var(--text2);
  border-left: 2px solid var(--border);
  min-height: 2rem;
  transition: color .3s, border-color .3s;
}
.message.error { color: var(--red); border-color: var(--red); }
.message.ok    { color: var(--green); border-color: var(--green); }

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .5; }
}

.app-version {
  text-align: center; padding: .5rem 1rem 1.5rem;
  font-family: var(--mono); font-size: .6rem;
  color: #2a2a2a; letter-spacing: .1em;
}
.header               { animation-delay: .0s; }
.readings             { animation-delay: .05s; }
.modes-section        { animation-delay: .1s; }