:root {
  --fl-bg:      #e8f4ff;
  --fl-border:  #b0d4f8;
  --fl-text:    #185890;
  --fl-icon-bg: #e8f4ff;
}

.app-hero{border-bottom:1px solid var(--color-border);padding:1.25rem 1.5rem 1.1rem}
.app-hero--sky{background:var(--fl-bg);border-bottom-color:var(--fl-border)}
.app-hero__inner{margin:0 auto}
.app-hero__title{font-size:clamp(1.4rem,3vw,2rem);font-weight:800;color:var(--fl-text);letter-spacing:-.02em;margin:0 0 .5rem;line-height:1.2}
.app-hero__desc{font-size:.9rem;color:var(--color-text-secondary);max-width:660px;line-height:1.6;margin:0 0 .85rem}
.app-hero__chips{display:flex;flex-wrap:wrap;gap:.35rem}
.hero-chip{display:inline-flex;align-items:center;padding:.22rem .65rem;font-size:.72rem;font-weight:700;background:var(--color-surface);border:1.5px solid var(--fl-border);border-radius:var(--radius-full);color:var(--fl-text);white-space:nowrap}

.app-wrap {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem 1rem 3rem;
}
.pane-in { width: 320px; flex-shrink: 0; display: flex; flex-direction: column; gap: 1rem; }
.pane-out { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1rem; }

.card {
  background: var(--color-surface);
  border: 1px solid var(--fl-border);
  border-radius: var(--radius-xl);
  padding: 1rem 1.125rem;
}
.card-title {
  font-size: .7rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--fl-text); margin: 0 0 .75rem;
}

.field { margin-bottom: .75rem; }
.field:last-child { margin-bottom: 0; }

label.lbl {
  display: block; font-size: .72rem; font-weight: 600;
  color: var(--color-text-muted); margin-bottom: .28rem;
}

input.num-in {
  width: 100%; box-sizing: border-box;
  padding: .4rem .6rem; font-size: .9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg); color: var(--color-text);
  transition: border-color .15s;
}
input.num-in:focus { outline: none; border-color: var(--fl-text); }

/* Results */
.index-display { text-align: center; padding: .5rem 0 1rem; }
.index-val { font-size: 2.6rem; font-weight: 800; color: var(--fl-text); line-height: 1; }
.index-lbl { font-size: .72rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: .07em; margin-top: .3rem; }

.band-badge {
  display: block; text-align: center; padding: .5rem .75rem;
  border-radius: var(--radius-md); font-size: .9rem; font-weight: 700;
  margin-bottom: .6rem;
}
.band-high         { background: var(--color-danger-subtle); color: var(--color-danger); border: 1.5px solid var(--color-danger); }
.band-intermediate { background: var(--color-warning-subtle); color: var(--color-warning); border: 1.5px solid var(--color-warning); }
.band-desirable     { background: var(--color-success-subtle); color: var(--color-success); border: 1.5px solid var(--color-success); }

.band-meaning { font-size: .85rem; color: var(--color-text); line-height: 1.6; margin: 0 0 .85rem; }

/* Gradient bar */
.gradient-bar-wrap { margin: .5rem 0 .75rem; }
.gradient-bar {
  position: relative; height: 14px; border-radius: var(--radius-full);
  background: linear-gradient(to right, var(--color-danger) 0%, var(--color-danger) 14.3%, var(--color-warning) 14.3%, var(--color-warning) 50%, var(--color-success) 50%, var(--color-success) 100%);
  border: 1px solid var(--color-border);
}
.gradient-marker {
  position: absolute; top: -4px; width: 4px; height: 22px;
  background: var(--color-text); border-radius: 2px;
  transform: translateX(-50%);
  transition: left .2s;
}
.gradient-labels {
  display: flex; justify-content: space-between;
  font-size: .65rem; color: var(--color-text-muted); margin-top: .35rem;
}

.rule-of-thumb {
  font-size: .78rem; color: var(--color-text-secondary); line-height: 1.6;
  margin: 0; padding: .55rem .7rem;
  background: var(--fl-bg); border: 1px solid var(--fl-border);
  border-radius: var(--radius-md);
}

.disclaimer {
  font-size: .72rem; color: var(--color-text-muted);
  margin: .5rem 0 0; padding: .5rem .65rem;
  background: var(--color-surface); border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
}

@media (max-width: 720px) {
  .app-wrap { flex-direction: column; }
  .pane-in { width: 100%; }
}