/* ============================================================
   Design Tokens
   ============================================================ */
:root {
  --bg:            #e8eddf;
  --card:          #f7f5ea;
  --card-alt:      #eff0e4;
  --text:          #3c4731;
  --muted:         #6b6f56;
  --accent:        #8a9b74;
  --accent-strong: #6f7a5f;
  --border:        rgba(45, 53, 36, 0.14);

  --font: 'Google Sans', 'Roboto', sans-serif;

  /* Unified type scale */
  --text-xs:   0.72rem;   /* labels, caps */
  --text-sm:   0.84rem;   /* secondary info */
  --text-base: 0.94rem;   /* body / table cells */
  --text-md:   1rem;      /* section titles */
  --text-lg:   1.08rem;   /* stat values */
  --text-xl:   1.18rem;   /* highlight totals */

  --gap-xs: 0.25rem;
  --gap-sm: 0.45rem;
  --gap-md: 0.8rem;
  --gap-lg: 1.2rem;
  /* Border radius */
  --radius: 8px;

  /* Mobile breakpoint */
  --mobile: 640px;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: clamp(13px, 1.1vw, 15px);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(138,155,116,0.09), transparent 45%), var(--bg);
  min-height: 100vh;
}

/* ============================================================
   Scrollbar — palette-matched (Webkit: Chrome, Edge)
   ============================================================ */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

::-webkit-scrollbar-track {
  background: #e4e8da;
}

::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: var(--radius);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-strong);
}

/* ============================================================
   Number inputs — hide spin arrows
   ============================================================ */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* ============================================================
   Visibility Helpers
   ============================================================ */
.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap;
}

/* Desktop-only / Mobile-only toggling */
.desktop-only { display: block; }
.mobile-only  { display: none;  }

@media (max-width: 640px) {
  .desktop-only { display: none;  }
  .mobile-only  { display: flex; }
}

/* ============================================================
   App Shell
   ============================================================ */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================================
   Sticky Header
   ============================================================ */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(224, 214, 200, 0.96); /* Warm natural brown tone */
  border-bottom: 1px solid rgba(138, 155, 116, 0.2);
  backdrop-filter: blur(6px);
}

.sticky-inner {
  display: flex;
  flex-direction: column;
  gap: var(--gap-xs);
  width: min(1120px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: var(--gap-sm) 0;
}

/* App title — always full width */
.header-title {
  font-size: calc(var(--text-sm) + 4px);
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Controls row: grade dropdown + professional toggle */
.header-controls {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  flex-wrap: nowrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  flex: 1;
  min-width: 0;
}

/* Grade row */
.grade-row {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.grade-row select {
  height: 36px;
  min-width: 190px;
  padding: 0 32px 0 10px;
  font-size: var(--text-base);
  font-family: var(--font);
  color: var(--text);
  font-weight: 600;
  background-color: #edf0e6;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236f7a5f' stroke-width='1.8' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  border: 1px solid rgba(111, 122, 95, 0.45);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.grade-row select:focus {
  outline: none;
  border-color: var(--accent);
  border-left-color: var(--accent-strong);
  box-shadow: 0 0 0 3px rgba(138, 155, 116, 0.2);
}

.grade-row select option {
  font-weight: 700;
}

.premium-display {
  font-size: calc(var(--text-sm) + 1px);
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Professional toggle */
.header-right {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.slider-label {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-sm);
  height: 36px;
  padding: 0 12px;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  background-color: #edf0e6;
  border: 1px solid rgba(111, 122, 95, 0.45);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.slider-label:hover {
  border-color: rgba(111, 122, 95, 0.65);
}

.slider-label input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  width: 32px;
  height: 18px;
  background: #ccc8b5;
  border-radius: 9px;
  display: inline-block;
  position: relative;
  flex-shrink: 0;
  transition: background 0.18s;
}

.slider::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 2px;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.18);
  transition: transform 0.18s;
}

.slider-label input:checked + .slider { background: var(--accent); }
.slider-label input:checked + .slider::before { transform: translateX(14px); }

/* ============================================================
   Main Content
   ============================================================ */
.main-content {
  flex: 1;
  width: min(1120px, calc(100% - 1.5rem));
  margin: 0 auto;
  padding: var(--gap-sm) 0 var(--gap-lg);
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

/* ============================================================
   Shared Card Base
   ============================================================ */
.info-card,
.input-card,
.result-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: var(--gap-md);
  border-radius: var(--radius);
}

/* ============================================================
   Info Card
   ============================================================ */
.info-card p {
  font-size: calc(var(--text-sm) + 1px);
  color: var(--muted);
  line-height: 1.5;
}

/* ============================================================
   Input Card
   ============================================================ */
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-md);
}

.cutoff-block {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

/* Cutoff block title */
.cutoff-title {
  font-size: calc(var(--text-xs) + 2px);
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-bottom: var(--gap-xs);
  border-bottom: 1px solid var(--border);
}

.cutoff-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-sm);
}

.field-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

/* All labels: uniform style */
.field-item label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* All inputs: uniform style */
.field-item input {
  height: 36px;
  width: 100%;
  padding: 0 10px;
  font-size: var(--text-base);
  font-family: var(--font);
  font-weight: 600;
  color: var(--text);
  background-color: #edf0e6;
  border: 1px solid rgba(111, 122, 95, 0.4);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field-item input:focus {
  outline: none;
  border-color: var(--accent);
  border-left-color: var(--accent-strong);
  box-shadow: 0 0 0 3px rgba(138, 155, 116, 0.2);
}

.field-item input:hover {
  border-color: rgba(111, 122, 95, 0.65);
}

/* Match input backgrounds to their respective cutoff card colors */
.cutoff-block:nth-child(1) .field-item input {
  background-color: rgba(138, 155, 116, 0.08);
}
.cutoff-block:nth-child(2) .field-item input {
  background-color: rgba(138, 155, 116, 0.16);
}

/* ============================================================
   Result Card
   ============================================================ */

/* Section heading */
.result-card > .summary-grid { margin-top: 0; }

/* ---- Rate Summary Boxes ---- */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
}

.summary-box {
  background: var(--card-alt);
  border: 1px solid var(--border);
  padding: var(--gap-sm) var(--gap-md);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Uniform label */
.summary-box .summary-label,
.summary-box span.summary-label {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* Uniform value */
.summary-box strong {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}


/* ---- Mobile: Cutoff Cards ---- */
.cutoff-cards {
  display: flex;
  flex-direction: row;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-sm);
}

.cutoff-card {
  flex: 1;
  min-width: 0;
  background: rgba(138, 155, 116, 0.08); /* Distinct light sage tint */
  border: 1px solid var(--border);
  padding: var(--gap-sm) var(--gap-md);
  border-radius: var(--radius);
}

.cutoff-card:nth-child(2) {
  background: rgba(138, 155, 116, 0.16); /* Distinct slightly deeper sage tint */
}

.cutoff-card-title {
  font-size: calc(var(--text-xs) + 2px);
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-bottom: var(--gap-xs);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--gap-xs);
}

.cutoff-card-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 5px 0;
  border-bottom: 1px solid rgba(45, 53, 36, 0.07);
}

.cutoff-card-row:last-child { border-bottom: none; }

.cutoff-card-row span {
  font-size: var(--text-sm);
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cutoff-card-row strong {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  text-align: right;
}

/* Net row in card: stands out */
.cutoff-card-row.net-row strong {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--text);
}
body.has-data .cutoff-card-row.net-row strong {
  text-decoration: underline;
}

/* ---- Total Block ---- */
.total-block {
  background: var(--accent); /* Lighter, pleasing sage green */
  border: 1px solid rgba(45, 53, 36, 0.15);
  padding: var(--gap-md) var(--gap-lg);
  margin-top: var(--gap-xs);
  border-radius: var(--radius);
}

.total-title {
  font-size: calc(var(--text-xs) + 3px);
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding-bottom: var(--gap-xs);
  border-bottom: 1px solid rgba(255,255,255,0.3);
  margin-bottom: var(--gap-sm);
}

/* Desktop: 5 items in a row */
.total-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--gap-md);
}

.total-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--gap-xs) 0;
}

.total-item span {
  font-size: calc(var(--text-xs) + 2px);
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.total-item strong {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

/* Total net — extra large */
.total-item.highlight strong {
  font-size: 1.9rem;
  color: #fff;
  letter-spacing: -0.02em;
}
body.has-data .total-item.highlight strong {
  text-decoration: underline;
}

/* ============================================================
   Responsive — Tablet (641–900px)
   ============================================================ */
@media (max-width: 900px) {
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .total-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .total-item.highlight {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   Responsive — Mobile (≤640px)
   ============================================================ */
@media (max-width: 640px) {

  /* Header: title on top, controls in one row below */
  .sticky-inner {
    padding: var(--gap-xs) 0;
  }

  .header-controls {
    flex-wrap: nowrap;
    gap: var(--gap-sm);
  }

  .header-left { gap: var(--gap-xs); flex: 1; min-width: 0; }
  .header-right { flex-shrink: 0; }

  .grade-row select { min-width: 140px; width: 140px; }

  /* Input: 1 cutoff per row */
  .field-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-sm);
  }

  /* Summary: 2×2 grid */
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Total: stacked rows on mobile */
  .total-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .total-item {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: var(--gap-sm);
    padding: 6px 0;
    border-bottom: 1px solid rgba(255,255,255,0.15);
  }

  .total-item:last-child { border-bottom: none; }

  .total-item strong {
    text-align: right;
    font-size: var(--text-md);
  }

  .total-item.highlight strong {
    font-size: var(--text-xl);
  }
}