/* =============================================================
   SF IoT · Kugoo Control — Material Design 3
   ============================================================= */

:root {
  /* Brand */
  --md-primary: #FF6B00;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #FFDCC2;
  --md-on-primary-container: #2B1700;
  --md-secondary-container: #FFE0CC;
  --md-on-secondary-container: #2B1700;

  /* Surfaces — light theme */
  --md-surface: #FFFBFF;
  --md-surface-container-low: #FFF3EA;
  --md-surface-container: #FFEADB;
  --md-surface-container-high: #FBE1CE;
  --md-on-surface: #1F1410;
  --md-on-surface-var: #52443C;
  --md-outline: #857468;
  --md-outline-var: #D7C2B5;

  /* Status colors */
  --ok: #2E7D32;
  --warn: #F9A825;
  --err: #C62828;
  --off: #BDBDBD;

  --radius-s: 8px;
  --radius-m: 12px;
  --radius-l: 16px;
  --radius-xl: 28px;

  --shadow-1: 0 1px 2px rgba(0,0,0,.08), 0 1px 3px rgba(0,0,0,.06);
  --shadow-2: 0 2px 6px rgba(0,0,0,.10), 0 1px 2px rgba(0,0,0,.06);
  --shadow-3: 0 6px 16px rgba(0,0,0,.14), 0 2px 4px rgba(0,0,0,.06);

  --ease-std: cubic-bezier(.2,0,0,1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-primary: #FFB68C;
    --md-on-primary: #4E2500;
    --md-primary-container: #6D3800;
    --md-on-primary-container: #FFDCC2;
    --md-secondary-container: #5A4130;
    --md-on-secondary-container: #FFDCC2;

    --md-surface: #1A110C;
    --md-surface-container-low: #211710;
    --md-surface-container: #261C15;
    --md-surface-container-high: #31261E;
    --md-on-surface: #F0DFD4;
    --md-on-surface-var: #D7C2B5;
    --md-outline: #9F8D80;
    --md-outline-var: #52443C;

    --ok: #81C784;
    --warn: #FFD54F;
    --err: #EF9A9A;
    --off: #4F4F4F;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--md-surface);
  color: var(--md-on-surface);
  font-family: "Roboto Flex", "Roboto", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.material-symbols-rounded {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  user-select: none;
  vertical-align: middle;
}
.material-symbols-rounded.small { font-size: 18px; }

/* ============ AUTH ============ */
.auth-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1200px 600px at 20% 0%, rgba(255,107,0,.14), transparent 60%),
    radial-gradient(900px 500px at 100% 100%, rgba(255,107,0,.10), transparent 60%),
    var(--md-surface);
  z-index: 100;
  animation: fadeIn .3s var(--ease-std);
}
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--md-surface-container-low);
  border-radius: var(--radius-xl);
  padding: 40px 28px 28px;
  box-shadow: var(--shadow-3);
  text-align: center;
}
.auth-logo {
  width: 72px; height: 72px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  animation: floatY 3s ease-in-out infinite;
}
.auth-logo .material-symbols-rounded { font-size: 40px; }
.auth-card h1 { margin: 0 0 4px; font-size: 24px; font-weight: 500; }
.auth-sub { margin: 0 0 28px; color: var(--md-on-surface-var); font-size: 14px; }

.textfield { position: relative; margin-bottom: 24px; }
.textfield input {
  width: 100%;
  padding: 24px 16px 12px;
  font-size: 16px;
  font-family: inherit;
  color: var(--md-on-surface);
  background: var(--md-surface-container);
  border: 1px solid var(--md-outline);
  border-radius: var(--radius-m);
  outline: none;
  transition: border-color .2s, background .2s;
}
.textfield input:focus {
  border-color: var(--md-primary);
  background: var(--md-surface-container-high);
}
.textfield label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--md-on-surface-var);
  font-size: 16px;
  pointer-events: none;
  transition: all .15s var(--ease-std);
}
.textfield input:focus + label,
.textfield input:not(:placeholder-shown) + label,
.textfield input:valid + label {
  top: 8px;
  transform: translateY(0);
  font-size: 12px;
  color: var(--md-primary);
}
.auth-error {
  margin: 16px 0 0;
  color: var(--err);
  font-size: 13px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .2s, transform .2s;
}
.auth-error.visible { opacity: 1; transform: translateY(0); }

/* ============ MAIN APP ============ */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  animation: fadeIn .4s var(--ease-std);
}

.top-bar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: color-mix(in srgb, var(--md-surface-container-low) 90%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--md-outline-var);
  z-index: 20;
}
.top-bar-left { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  font-size: 32px;
  color: var(--md-primary);
  animation: wiggle 6s ease-in-out infinite;
}
.top-bar-title { font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.top-bar-sub { font-size: 12px; color: var(--md-on-surface-var); margin-top: 1px; }

.status-strip { display: flex; gap: 10px; }
.status-dot {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--md-surface-container);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 500;
  color: var(--md-on-surface-var);
  transition: background .2s, color .2s;
}
.status-dot .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--off);
  transition: background .2s, box-shadow .3s;
}
.status-dot.is-ok .dot { background: var(--ok); }
.status-dot.is-warn .dot { background: var(--warn); }
.status-dot.is-err .dot { background: var(--err); }
.status-dot.is-ok { color: var(--md-on-surface); }
.status-dot.is-ok .dot { animation: pulse 2.2s ease-in-out infinite; box-shadow: 0 0 0 0 var(--ok); }
.status-dot.is-warn .dot { animation: pulse 1.4s ease-in-out infinite; }

@media (max-width: 560px) {
  .status-dot .status-label { display: none; }
  .status-dot { padding: 8px; }
}

.main {
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Mode card */
.mode-card {
  background: linear-gradient(135deg, var(--md-primary-container), var(--md-secondary-container));
  color: var(--md-on-primary-container);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow: var(--shadow-2);
  position: relative;
  overflow: hidden;
}
.mode-card::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(closest-side, rgba(255,255,255,.35), transparent);
  opacity: .6;
  animation: spin 22s linear infinite;
  pointer-events: none;
}
.mode-card-label { font-size: 13px; font-weight: 500; letter-spacing: .06em; text-transform: uppercase; opacity: .75; }
.mode-card-value { margin: 8px 0 0; line-height: 1; }
.mode-number {
  display: inline-block;
  font-size: 88px;
  font-weight: 700;
  letter-spacing: -.04em;
  transition: transform .25s var(--ease-std), opacity .2s;
}
.mode-number.bump { animation: bump .4s var(--ease-std); }
.mode-name {
  font-size: 22px;
  font-weight: 500;
  margin-top: 4px;
  min-height: 28px;
}
.mode-card-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 12px;
  opacity: .8;
}

/* Level buttons */
.levels-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
@media (min-width: 600px) {
  .levels-grid { grid-template-columns: repeat(4, 1fr); }
}
.level-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding: 18px 16px;
  min-height: 120px;
  background: var(--md-surface-container);
  color: var(--md-on-surface);
  border: 1px solid transparent;
  border-radius: var(--radius-l);
  cursor: pointer;
  overflow: hidden;
  font-family: inherit;
  text-align: left;
  transition:
    background .2s,
    border-color .2s,
    transform .15s var(--ease-std),
    box-shadow .2s;
}
.level-btn:hover {
  background: var(--md-surface-container-high);
  box-shadow: var(--shadow-2);
  transform: translateY(-1px);
}
.level-btn:active { transform: translateY(0) scale(.98); }
.level-btn.selected {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  border-color: var(--md-primary);
  box-shadow: var(--shadow-3);
}
.level-icon { font-size: 28px; color: var(--md-primary); }
.level-btn.selected .level-icon { color: var(--md-on-primary-container); }
.level-title { font-size: 16px; font-weight: 600; margin-top: auto; }
.level-desc { font-size: 11px; opacity: .6; font-family: "JetBrains Mono", ui-monospace, monospace; }

/* Ripple */
.ripple { position: relative; overflow: hidden; }
.ripple > .rip {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: currentColor;
  opacity: .18;
  pointer-events: none;
  animation: ripple .6s var(--ease-std) forwards;
}

/* Buttons */
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-filled, .btn-tonal, .btn-outlined {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  min-height: 44px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  border-radius: 100px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .2s, border-color .2s, transform .15s, box-shadow .2s;
}
.btn-filled { background: var(--md-primary); color: var(--md-on-primary); }
.btn-filled:hover { box-shadow: var(--shadow-2); }
.btn-tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.btn-tonal:hover { box-shadow: var(--shadow-1); }
.btn-outlined { background: transparent; color: var(--md-primary); border-color: var(--md-outline); }
.btn-outlined:hover { background: color-mix(in srgb, var(--md-primary) 8%, transparent); }
.btn-filled:active, .btn-tonal:active, .btn-outlined:active { transform: scale(.97); }
.btn-large { min-height: 48px; padding: 14px 28px; font-size: 15px; width: 100%; }
.btn-tonal, .btn-outlined { flex: 1; min-width: 160px; }

/* Log */
.log-card {
  background: var(--md-surface-container-low);
  border: 1px solid var(--md-outline-var);
  border-radius: var(--radius-l);
  overflow: hidden;
}
.log-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--md-surface-container);
  border-bottom: 1px solid var(--md-outline-var);
  font-size: 13px;
  font-weight: 500;
}
.log-header span:nth-child(2) { flex: 1; }
.icon-btn {
  background: transparent;
  border: none;
  color: var(--md-on-surface-var);
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: flex;
  transition: background .15s;
}
.icon-btn:hover { background: var(--md-surface-container-high); }
.log-list {
  list-style: none;
  padding: 8px 0;
  margin: 0;
  max-height: 280px;
  overflow-y: auto;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 12px;
}
.log-list li {
  padding: 6px 16px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  animation: slideIn .3s var(--ease-std);
  word-break: break-word;
}
.log-time { color: var(--md-on-surface-var); opacity: .7; flex-shrink: 0; min-width: 56px; }
.log-msg { flex: 1; }
.log-msg.ok { color: var(--ok); }
.log-msg.warn { color: var(--warn); }
.log-msg.err { color: var(--err); }

/* Snackbar */
.snackbar {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 200%);
  background: var(--md-on-surface);
  color: var(--md-surface);
  padding: 14px 20px;
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-3);
  font-size: 14px;
  max-width: 90vw;
  z-index: 50;
  transition: transform .35s var(--ease-std);
}
.snackbar.show { transform: translate(-50%, 0); }
.snackbar.err { background: var(--err); color: #fff; }
.snackbar.ok { background: var(--ok); color: #fff; }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-12px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 currentColor; opacity: 1; }
  70%  { box-shadow: 0 0 0 6px transparent; opacity: .85; }
  100% { box-shadow: 0 0 0 0 transparent; opacity: 1; }
}
@keyframes bump {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.15); }
  100% { transform: scale(1); }
}
@keyframes ripple { to { transform: scale(2.8); opacity: 0; } }
@keyframes wiggle {
  0%, 100% { transform: rotate(0deg); }
  45%      { transform: rotate(-4deg); }
  55%      { transform: rotate(4deg); }
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes spin { to { transform: rotate(360deg); } }