:root {
  --bg: #f6f7fb;
  --panel: rgba(255,255,255,0.66);
  --panel-2: rgba(255,255,255,0.9);
  --text: #0b1220;
  --muted: #667085;
  --accent: #3b82f6;
  --accent-2: #8b5cf6;
  --success: #16a34a;
  --danger: #ef4444;
  --border: #e6e9f0;
  --input: #ffffff;
  --shadow: 0 12px 32px rgba(17,24,39,0.08), 0 1px 0 rgba(255,255,255,0.6) inset;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 24px, rgba(99,102,241,0.06) 25px),
    repeating-linear-gradient(90deg, transparent, transparent 24px, rgba(99,102,241,0.06) 25px),
    radial-gradient(900px 600px at -10% -10%, rgba(59,130,246,0.12), transparent 60%),
    radial-gradient(1000px 700px at 110% -10%, rgba(139,92,246,0.12), transparent 60%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 960px;
  padding: 32px 20px 56px;
  margin: 0 auto;
}

.header {
  text-align: center;
  margin-bottom: 20px;
  position: relative;
}
.header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.header .brand .logo {
  width: 60px;
  height: 60px;
  object-fit: contain;
}
.header .share-wrap {
  position: absolute;
  top: -20px;
  right: -20px;
  width: 100px;
}
.copy-toast {
  position: relative;
  top: 0px;
  right: 30px;
  transform: translateY(-100%);
  background: rgba(15,23,42,0.95);
  color: #fff;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
  box-shadow: 0 6px 18px rgba(17,24,39,0.18);
  min-width: 160px;
  white-space: nowrap;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}
.copy-toast.show {
  opacity: 1;
  transform: translateY(-115%);
}
.header h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
  font-family: 'Poppins', sans-serif;
}
.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 16px;
  align-items: start;
}

.card {
  background: var(--panel);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 18px;
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
}

.inputs { grid-column: 1; max-width: 540px; }
.outputs { grid-column: 2; }

.inputs .card + .card { margin-top: 12px; }
.outputs .card + .card { margin-top: 12px; }

/* Collapsible card styles */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1px solid rgba(15,23,42,0.06);
  background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(255,255,255,0.8));
  color: var(--muted);
  cursor: pointer;
}
.share-wrap #share-btn {
  width: auto;
  height: 32px;
  padding: 6px 12px;
  background-image: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #ffffff;
  -webkit-text-fill-color: #ffffff;
  border: none;
}
.share-wrap #share-btn:hover { filter: brightness(1.05); }
.share-wrap #share-btn:active {
  transform: scale(0.985);
  box-shadow: 0 4px 12px rgba(17,24,39,0.06);
  filter: brightness(0.98);
}
.icon-button:hover { color: var(--muted); }
.caret { display: inline-block; transform: rotate(180deg); transition: transform 180ms ease; font-weight: 700; }
.icon-button[aria-expanded="true"] .caret { transform: rotate(0deg); }

.collapsible {
  overflow: hidden;
  height: 0;
  transition: height 220ms ease;
}
.collapsible[aria-hidden="false"] { height: auto; }
.collapsible-inner { padding-top: 8px; }

.section { margin: 8px 0 18px; }
.section-title {
  margin: 6px 2px 12px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
}

.form-field { grid-column: span 6; }
.form-field.full { grid-column: 1 / -1; }

label {
  display: inline-block;
  font-size: 13px;
  color: var(--text);
  margin-bottom: 6px;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  appearance: none;
  background: var(--input);
  color: var(--text);
  border: 1px solid #d0d7e2;
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  text-align: center;
  transition: border-color 120ms ease, box-shadow 120ms ease, background 120ms ease;
  box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset;
}

.field-with-suffix {
  position: relative;
}
.field-with-suffix .suffix {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
}
.field-with-suffix input[type="number"] { padding-right: 28px; }

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

.help-text { color: var(--muted); font-size: 12px; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-2);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 12px;
  padding: 10px 12px;
}
.checkbox-row input[type="checkbox"] {
  width: 16px; height: 16px;
}

.form-actions {
  display: flex;
  justify-content: center;
  margin-top: 16px;
  box-shadow: var(--shadow);
  transition: box-shadow 160ms ease;
}

button {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid rgba(15,23,42,0.06);
  background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(255,255,255,0.75));
  color: var(--text);
  font-size: 14px;
  box-shadow: 0 6px 18px rgba(17,24,39,0.06);
}

/* Wider, centered Calculate button with blue→purple gradient fill and white text */
.form-actions .ghost {
  min-width: 100%;
  padding: 12px 24px;
  text-align: center;
  font-weight: 700;
  background-image: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #ffffff;
  -webkit-text-fill-color: #ffffff;
  border: none;
  transition: transform 140ms cubic-bezier(.2,.7,.2,1), box-shadow 140ms ease, filter 140ms ease;
  will-change: transform, box-shadow;
}

.form-actions .ghost:hover {
  filter: brightness(1.05);
}

/* Pressed (active) state: add depth by slightly shrinking and reducing shadow */
.form-actions .ghost:active {
  transform: scale(0.985);
  box-shadow: 0 4px 12px rgba(17,24,39,0.06);
  filter: brightness(0.98);
}

/* While the button is pressed, slightly reduce wrapper shadow for a cohesive depth cue */
.form-actions:has(.ghost:active) {
  box-shadow: 0 8px 24px rgba(17,24,39,0.08), 0 1px 0 rgba(255,255,255,0.6) inset;
}

button.ghost[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

.metrics {
  list-style: none;
  padding: 0; margin: 6px 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

/* Glassy iOS-style switch */
.switch-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--panel-2);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 12px;
  padding: 10px 12px;
}
.switch-text { font-size: 13px; color: var(--text); }
.switch-input { position: absolute; opacity: 0; pointer-events: none; }
.switch {
  position: relative;
  width: 52px; height: 32px;
  display: inline-block;
  cursor: pointer;
}
.switch-track {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.76));
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(17,24,39,0.06), 0 1px 0 rgba(255,255,255,0.7) inset;
  transition: background 160ms ease, border-color 160ms ease;
  backdrop-filter: blur(8px) saturate(160%);
  -webkit-backdrop-filter: blur(8px) saturate(160%);
}
.switch-thumb {
  position: absolute; top: 3px; left: 3px;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: radial-gradient(40% 60% at 30% 30%, rgba(255,255,255,0.95), rgba(255,255,255,0.75)), #ffffff;
  box-shadow: 0 6px 16px rgba(17,24,39,0.1), 0 0 0 1px rgba(15,23,42,0.06) inset;
  transition: transform 180ms cubic-bezier(.2,.7,.2,1), box-shadow 180ms ease;
}
.switch:hover .switch-thumb { box-shadow: 0 8px 20px rgba(17,24,39,0.12), 0 0 0 1px rgba(15,23,42,0.08) inset; }

.switch-input:checked + .switch .switch-track {
  background: linear-gradient(180deg, rgba(99,102,241,0.25), rgba(59,130,246,0.25)),
              linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.76));
  border-color: rgba(59,130,246,0.35);
}
.switch-input:checked + .switch .switch-thumb {
  transform: translateX(20px);
}

.switch-input:focus-visible + .switch .switch-track {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59,130,246,0.25);
}
.metric {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  background: var(--panel-2);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 12px;
  padding: 12px 14px;
}
.metric-main { padding-right: 10px; }
.metric-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.metric-desc { color: var(--muted); font-size: 12px; line-height: 1.35; }
.metric-value { font-size: 16px; font-weight: 600; color: var(--text); }
/* Globally hide metric descriptions when toggled off */
body.hide-metric-desc .metric-desc { display: none !important; }
.metric-badge-yes {
  font-size: 12px;
  font-weight: 600;
  color: #065f46;
  background: #d1fae5;
  border: 1px solid #a7f3d0;
  border-radius: 999px;
  padding: 6px 10px;
}
.metric-badge-no {
  font-size: 12px;
  font-weight: 600;
  color: #991b1b;
  background: #fee2e2;
  border: 1px solid #fca5a5;
  border-radius: 999px;
  padding: 6px 10px;
}

/* Duration slider */
.duration-group { margin-top: 0; }
.duration-group .metric-box {
  background: var(--panel-2);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 12px;
  padding: 12px 14px;
}
.slider-wrap {
  margin-top: 12px;
  /* Align track endpoints under tick label centers (1–4):
     start at 12.5%, end at 87.5% => width 75% */
  width: 80%;
  margin-left: 9.5%;
  margin-right: 10.5%;
}
.slider-wrap input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.76));
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(17,24,39,0.06), 0 1px 0 rgba(255,255,255,0.7) inset;
  outline: none;
}
.slider-wrap input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  background: linear-gradient(90deg, rgba(99,102,241,0.35), rgba(59,130,246,0.35));
  border-radius: 999px;
}
.slider-wrap input[type="range"]::-moz-range-track {
  height: 8px;
  background: linear-gradient(90deg, rgba(99,102,241,0.35), rgba(59,130,246,0.35));
  border-radius: 999px;
}
.slider-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px; height: 22px;
  background: radial-gradient(40% 60% at 30% 30%, rgba(255,255,255,0.95), rgba(255,255,255,0.75)), #ffffff;
  box-shadow: 0 6px 16px rgba(17,24,39,0.1), 0 0 0 1px rgba(15,23,42,0.06) inset;
  border-radius: 50%;
  cursor: pointer;
  margin-top: -7px; /* center on track for 8px track */
}
.slider-wrap input[type="range"]::-moz-range-thumb {
  width: 22px; height: 22px;
  background: radial-gradient(40% 60% at 30% 30%, rgba(255,255,255,0.95), rgba(255,255,255,0.75)), #ffffff;
  box-shadow: 0 6px 16px rgba(17,24,39,0.1), 0 0 0 1px rgba(15,23,42,0.06) inset;
  border: none;
  border-radius: 50%;
  cursor: pointer;
}
.slider-wrap input[type="range"]::-moz-range-progress {
  height: 8px;
  background: linear-gradient(90deg, rgba(99,102,241,0.35), rgba(59,130,246,0.35));
  border-radius: 999px;
}
.slider-wrap input[type="range"]:focus-visible {
  box-shadow: 0 0 0 3px rgba(59,130,246,0.25);
}
.slider-ticks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}
.slider-ticks span { text-align: center; transform: translateY(-2px); }

@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; }
  .inputs { max-width: none; }
  .form-field { grid-column: 1 / -1; }
  /* Ensure second column stacks below the first on mobile */
  .inputs, .outputs { grid-column: 1; }
}


.footer {
  margin-top: 24px;
}
.footer-inner {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-2);
  border: 1px solid rgba(15,23,42,0.06);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--text);
  text-decoration: none;
}
.footer-link:hover { filter: brightness(1.03); }
.footer-icon {
  width: 16px;
  height: 16px;
  fill: currentColor;
}


/* Modal */
.modal[aria-hidden="true"] { display: none; }
.modal[aria-hidden="false"] { display: block; }
.modal {
  position: fixed; inset: 0; z-index: 50;
}
.modal-overlay {
  position: absolute; inset: 0;
  background: rgba(15,23,42,0.5);
  backdrop-filter: blur(2px);
}
.modal-panel {
  position: relative;
  max-width: 560px;
  margin: 8vh auto;
  background: var(--panel);
  border: 1px solid rgba(15,23,42,0.08);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 16px;
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
}
.modal-title { margin: 0; font-size: 18px; }
.modal-body { margin-top: 8px; color: var(--text); }
.modal-body code { background: var(--input); padding: 2px 6px; border-radius: 6px; }
.modal-footer { margin-top: 12px; display: flex; gap: 8px; justify-content: flex-end; }