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

:root {
  --bg:        #0D1117;
  --surface:   #161B22;
  --surface2:  #1C2333;
  --border:    #30363D;
  --border2:   #21262D;
  --accent:    #2563EB;
  --accent-glow: rgba(37,99,235,0.18);
  --text:      #E6EDF3;
  --text2:     #8B949E;
  --text3:     #6E7681;
  --green-bg:  #0F2A1A;
  --green-txt: #3FB950;
  --yellow-bg: #2D1F00;
  --yellow-txt:#D29922;
  --blue-bg:   #0D2048;
  --blue-txt:  #58A6FF;
  --purple-bg: #1A0F2E;
  --purple-txt:#BC8CFF;
  --radius:    12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}
.header-icon {
  width: 44px; height: 44px;
  background: var(--accent-glow);
  border: 1px solid rgba(37,99,235,0.35);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.header-icon svg { width: 22px; height: 22px; color: var(--blue-txt); }
.header-text h1 {
  font-size: 19px; font-weight: 600; letter-spacing: -0.3px;
  display: flex; align-items: center; gap: 10px;
}
.header-text h1 .chip {
  font-size: 11px; font-weight: 500; letter-spacing: 0.5px;
  background: var(--accent-glow); color: var(--blue-txt);
  border: 1px solid rgba(37,99,235,0.3);
  border-radius: 20px; padding: 2px 9px;
  text-transform: uppercase;
}
.header-text p { font-size: 13px; color: var(--text2); margin-top: 3px; }

.toggle-group-label {
  font-size: 11px; font-weight: 500; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 8px;
}
.toggle-group {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 3px;
  gap: 2px;
}
.toggle-btn {
  padding: 6px 18px;
  font-size: 13px; font-weight: 500;
  border: none; cursor: pointer;
  background: transparent;
  color: var(--text2);
  border-radius: 100px;
  transition: all .18s ease;
  white-space: nowrap;
}
.toggle-btn.on {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 6px rgba(37,99,235,0.4);
}
.toggle-btn:not(.on):hover { color: var(--text); background: var(--surface2); }

.controls-top {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
}
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-end;
}
.ctrl { display: flex; flex-direction: column; gap: 7px; }
.ctrl label {
  font-size: 11px; font-weight: 500; letter-spacing: 0.5px;
  text-transform: uppercase; color: var(--text3);
}
.ctrl select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 36px 9px 13px;
  font-size: 14px;
  font-family: var(--font);
  cursor: pointer;
  min-width: 160px;
  background-image: url("icons/chevron.svg");
  background-repeat: no-repeat;
  background-position: right 12px center;
  transition: border-color .15s;
}
.ctrl select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.ctrl select:hover { border-color: #484F58; }

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 28px;
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.result-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #7C3AED);
}
.res-label {
  font-size: 11px; font-weight: 500; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 6px;
}
.res-value { display: flex; align-items: baseline; gap: 8px; }
.res-big {
  font-size: 52px; font-weight: 700; letter-spacing: -2px;
  color: var(--text); line-height: 1;
  font-variant-numeric: tabular-nums;
}
.res-unit { font-size: 20px; font-weight: 400; color: var(--text2); }
.res-meta {
  font-size: 13px; color: var(--text2);
  display: flex; flex-direction: column; gap: 6px;
}
.res-code {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text3);
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 4px 10px;
  display: inline-block;
  margin-top: 4px;
}

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 500;
  padding: 3px 10px; border-radius: 20px;
  border: 1px solid;
}
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; }
.q1 { background: var(--green-bg);  color: var(--green-txt);  border-color: rgba(59,176,81,0.2); }
.q1::before { background: var(--green-txt); }
.q2 { background: var(--yellow-bg); color: var(--yellow-txt); border-color: rgba(210,153,34,0.2); }
.q2::before { background: var(--yellow-txt); }
.q3 { background: var(--blue-bg);   color: var(--blue-txt);   border-color: rgba(88,166,255,0.2); }
.q3::before { background: var(--blue-txt); }
.q4 { background: var(--purple-bg); color: var(--purple-txt); border-color: rgba(188,140,255,0.2); }
.q4::before { background: var(--purple-txt); }

.table-label {
  font-size: 11px; font-weight: 500; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 12px;
}
.table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead tr { background: var(--surface); }
th {
  text-align: left;
  padding: 10px 14px;
  font-size: 11px; font-weight: 500; letter-spacing: 0.5px;
  text-transform: uppercase; color: var(--text3);
  border-bottom: 1px solid var(--border);
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border2);
  color: var(--text2);
  vertical-align: middle;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface2); }
tr.active td {
  background: rgba(37,99,235,0.08);
  color: var(--text);
  font-weight: 500;
}
tr.active td:first-child { border-left: 2px solid var(--accent); }

@media (max-width: 540px) {
  .page { padding: 24px 16px 48px; }
  .res-big { font-size: 40px; }
  th, td { padding: 8px 10px; }
}

.header-text { flex: 1; min-width: 0; }
.lang-switch .toggle-btn { padding: 4px 11px; font-size: 12px; }

[hidden] { display: none !important; }

.res-uso { color: var(--text3); font-size: 12px; }
.arrow { color: var(--accent); }
td.cu { font-family: var(--mono); font-size: 12px; }
td.uso { font-size: 12px; color: var(--text3); }

.table-note {
  font-size: 12px; color: var(--text3);
  margin-top: 12px; line-height: 1.5;
}

.footer {
  margin-top: 40px; padding-top: 20px;
  border-top: 1px solid var(--border2);
  font-size: 12px; color: var(--text3);
  display: flex; flex-wrap: wrap; gap: 6px 14px;
}
.footer a { color: var(--text2); text-decoration: none; }
.footer a:hover { color: var(--blue-txt); text-decoration: underline; }

@media (max-width: 540px) {
  .header { flex-wrap: wrap; }
  .table-wrap { overflow-x: auto; }
}

.header-actions {
  display: flex; align-items: center; gap: 10px;
  flex-shrink: 0; margin-left: auto;
}
.install-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 13px;
  font: 500 12px var(--font);
  color: #fff; background: var(--accent);
  border: none; border-radius: 100px; cursor: pointer;
  box-shadow: 0 1px 6px rgba(37,99,235,0.4);
  transition: background .15s ease;
  white-space: nowrap;
}
.install-btn:hover { background: #1D4ED8; }
.install-btn:focus-visible, .ios-hint-close:focus-visible, .toggle-btn:focus-visible {
  outline: 2px solid var(--blue-txt); outline-offset: 2px;
}
.install-btn svg { width: 14px; height: 14px; }

.ios-hint {
  display: flex; align-items: center; gap: 10px;
  margin: -20px 0 28px;
  padding: 10px 12px 10px 14px;
  background: var(--blue-bg);
  border: 1px solid rgba(88,166,255,0.25);
  border-radius: var(--radius-sm);
  color: var(--text); font-size: 13px;
}
.ios-hint-icon { width: 18px; height: 18px; color: var(--blue-txt); flex-shrink: 0; }
.ios-hint span { flex: 1; }
.ios-hint-close {
  background: none; border: none; cursor: pointer;
  color: var(--text2); font-size: 20px; line-height: 1;
  padding: 2px 6px; border-radius: 6px;
}
.ios-hint-close:hover { color: var(--text); background: var(--surface2); }

@media (max-width: 540px) {
  .header { margin-bottom: 28px; }
  .header-text { flex-basis: calc(100% - 58px); }
  .header-actions { width: 100%; margin-left: 0; justify-content: space-between; }
  .header-actions .install-btn[hidden] + .lang-switch { margin-left: auto; }
}

/* ---------- help dialog, update banner, help button ---------- */
.help-btn { font: inherit; font-size: 13px; font-weight: 600; color: var(--blue-txt); background: transparent; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 12px; min-height: 40px; cursor: pointer; }
.help-btn:hover { background: var(--surface2); }
.help { width: min(680px, calc(100% - 24px)); max-height: calc(100vh - 32px); max-height: calc(100dvh - 32px); padding: 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text); box-shadow: 0 12px 44px rgba(0,0,0,.6); }
.help::backdrop { background: rgba(0,0,0,.66); }
.help-head { position: sticky; top: 0; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 18px; background: var(--surface); border-bottom: 1px solid var(--border); }
.help-head h2 { font-size: 17px; }
.help-close { font: inherit; font-weight: 600; color: var(--blue-txt); background: transparent; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 14px; min-height: 40px; cursor: pointer; }
.help-body { padding: 4px 18px 20px; }
.help-body h3 { margin: 18px 0 4px; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--blue-txt); }
.help-body p, .help-body li { font-size: 14px; line-height: 1.5; margin: 0; }
.help-body ul { margin: 2px 0 0; padding-left: 20px; } .help-body li { margin: 4px 0; }
.help-body a { color: var(--blue-txt); }
.update { position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%); display: flex; flex-wrap: wrap; align-items: center; gap: 10px; background: var(--surface); border: 1px solid var(--accent); border-radius: var(--radius-sm); padding: 10px 14px; box-shadow: 0 8px 30px rgba(0,0,0,.5); z-index: 20; font-size: 14px; }
.update[hidden] { display: none; }
.update-btn { font: inherit; font-weight: 600; min-height: 40px; padding: 6px 14px; border-radius: var(--radius-sm); border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer; }
.update-btn.ghost { background: transparent; color: var(--blue-txt); }
@media (max-width: 560px) { .help { width: calc(100% - 16px); } .update { width: calc(100% - 24px); } }