:root {
  --bg:           #f6f7fb;
  --surface:      #ffffff;
  --surface-alt:  #f0f2f8;
  --border:       #e2e6f0;
  --border-soft:  #edf0f7;
  --text:         #111827;
  --text-2:       #4b5563;
  --text-3:       #9ca3af;
  --accent:       #1d4ed8;
  --accent-light: #eff6ff;
  --accent-2:     #1e40af;
  --green:        #059669;
  --green-light:  #ecfdf5;
  --amber:        #d97706;
  --amber-light:  #fffbeb;
  --red:          #dc2626;
  --header-bg:    #1e3a8a;
  --header-text:  #ffffff;
  --radius:       12px;
  --radius-sm:    8px;
  --radius-xs:    5px;
  --shadow:       0 1px 4px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
  --trans:        0.18s ease;
  --font: 'DM Sans', system-ui, -apple-system, sans-serif;
  --mono: 'DM Mono', 'Consolas', monospace;
}

[data-theme="dark"] {
  --bg:           #0d1117;
  --surface:      #161b22;
  --surface-alt:  #1c2333;
  --border:       #30363d;
  --border-soft:  #21262d;
  --text:         #e6edf3;
  --text-2:       #8b949e;
  --text-3:       #484f58;
  --accent:       #58a6ff;
  --accent-light: #0d1f3c;
  --accent-2:     #388bfd;
  --green:        #3fb950;
  --green-light:  #0d2218;
  --amber:        #e3b341;
  --amber-light:  #2d1f06;
  --header-bg:    #161b22;
  --shadow:       0 1px 4px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.2);
  --shadow-sm:    0 1px 3px rgba(0,0,0,.3);
}

/* ── Reset ───────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
  transition: background var(--trans), color var(--trans);
}

/* ── Header ─────────────────────────────────────────────────────── */
.site-header {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 200;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 11px; }

.brand-logo svg {
  width: 36px; height: 36px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0;
  color: var(--header-text);
}

.brand-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
}

.brand-sub {
  font-size: .72rem;
  opacity: .65;
  letter-spacing: .01em;
}

.header-actions { display: flex; align-items: center; gap: 12px; }

.rate-tag {
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.8);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 20px;
  padding: 3px 11px;
  font-size: .7rem;
  font-weight: 500;
  white-space: nowrap;
}
@media (max-width: 560px) { .rate-tag { display: none; } }

.theme-btn {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 8px;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: rgba(255,255,255,.85);
  transition: background var(--trans);
  flex-shrink: 0;
}
.theme-btn:hover { background: rgba(255,255,255,.22); }
.theme-btn svg { width: 17px; height: 17px; }
.theme-btn .icon-moon { display: none; }
[data-theme="dark"] .theme-btn .icon-sun  { display: none; }
[data-theme="dark"] .theme-btn .icon-moon { display: block; }

/* ── Layout ──────────────────────────────────────────────────────── */
.layout {
  max-width: 1140px;
  margin: 0 auto;
  padding: 28px 20px 60px;
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
}

@media (min-width: 880px) {
  .layout {
    grid-template-columns: 360px 1fr;
    align-items: start;
  }
}

/* ── Panel ───────────────────────────────────────────────────────── */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: background var(--trans), border-color var(--trans);
}

.panel-title {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-soft);
}

/* ── Fields ──────────────────────────────────────────────────────── */
.field-group { margin-bottom: 18px; }

.field-label {
  display: block;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 7px;
  letter-spacing: .02em;
}

.field-hint {
  font-size: .72rem;
  color: var(--text-3);
  margin-top: 6px;
}

/* Select */
.select-wrap { position: relative; }

.select-wrap select {
  width: 100%;
  appearance: none;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 36px 9px 12px;
  font-size: .9rem;
  font-family: var(--font);
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--trans), box-shadow var(--trans);
}

.select-wrap select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.select-arrow {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px; height: 16px;
  color: var(--text-3);
  pointer-events: none;
}

/* Segmented control */
.seg-control {
  display: flex;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}

.seg-btn {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 5px;
  padding: 7px 12px;
  font-size: .85rem;
  font-weight: 500;
  font-family: var(--font);
  color: var(--text-2);
  cursor: pointer;
  transition: background var(--trans), color var(--trans);
}

.seg-btn.active {
  background: var(--surface);
  color: var(--accent);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* Number input */
.input-row {
  display: flex;
  align-items: center;
  gap: 0;
}

.input-row input[type="number"] {
  flex: 1;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  padding: 9px 12px;
  font-size: 1.05rem;
  font-family: var(--mono);
  font-weight: 500;
  color: var(--text);
  width: 100%;
  transition: border-color var(--trans), box-shadow var(--trans);
  appearance: textfield;
  -moz-appearance: textfield;
}

.input-row input[type="number"]::-webkit-inner-spin-button,
.input-row input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }

.input-row input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  z-index: 1;
}

.input-suffix {
  background: var(--border);
  border: 1.5px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 9px 12px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-2);
  white-space: nowrap;
  line-height: 1.5;
}

/* Slider */
.slider-wrap { margin-top: 10px; }

input[type="range"] {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2.5px solid var(--surface);
  box-shadow: 0 0 0 1.5px var(--accent);
  cursor: pointer;
  transition: transform var(--trans);
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }

input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2.5px solid var(--surface);
  cursor: pointer;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 5px;
  font-size: .68rem;
  color: var(--text-3);
}

/* Locked field */
.locked-field {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: .87rem;
  color: var(--text-2);
}

.locked-field svg {
  width: 14px; height: 14px;
  flex-shrink: 0;
  opacity: .5;
}

/* Share */
.share-group {
  display: flex !important;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 13px;
  font-size: .8rem;
  font-weight: 500;
  font-family: var(--font);
  color: var(--text-2);
  cursor: pointer;
  transition: border-color var(--trans), color var(--trans);
}
.share-btn svg { width: 13px; height: 13px; }

@media (max-width: 560px) {
  .share-btn {
    min-height: 40px;
    flex: 1;
    justify-content: center;
  }
}
.share-btn:hover { border-color: var(--accent); color: var(--accent); }

.share-toast {
  font-size: .78rem;
  color: var(--green);
  font-weight: 500;
  min-height: 1.2em;
  transition: opacity var(--trans);
}

/* Total card */
.total-card {
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 100%);
  border-radius: var(--radius);
  padding: 22px 20px;
  color: #fff;
  margin-top: 20px;
  position: relative;
  overflow: hidden;
}

.total-card::before {
  content: '';
  position: absolute;
  top: -40px; right: -20px;
  width: 120px; height: 120px;
  background: rgba(255,255,255,.07);
  border-radius: 50%;
}

.total-label {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  opacity: .7;
  margin-bottom: 6px;
}

.total-amount {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -.04em;
  font-family: var(--mono);
  line-height: 1;
  text-shadow: 0 2px 8px rgba(0,0,0,.15);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}

.total-amount.bump { transform: scale(1.04); }

.total-meta {
  font-size: .75rem;
  opacity: .7;
  margin-top: 8px;
}

/* Export button */
.export-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 12px;
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: .85rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-2);
  cursor: pointer;
  transition: border-color var(--trans), color var(--trans), background var(--trans);
}
.export-btn svg { width: 15px; height: 15px; }
.export-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ── Bill Breakdown ───────────────────────────────────────────────── */
.bill-section { margin-bottom: 16px; }

.bill-section-header {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 8px 0 6px;
  border-bottom: 2px solid var(--accent-light);
  margin-bottom: 4px;
}

[data-theme="dark"] .bill-section-header {
  border-bottom-color: var(--accent-light);
}

.bill-subsection-header {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 8px 0 4px;
  margin-top: 4px;
}

.bill-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border-soft);
  transition: background var(--trans);
  min-width: 0;
}

.bill-line:last-of-type { border-bottom: none; }
.bill-line:hover { background: var(--surface-alt); border-radius: 4px; }

.bill-line--main .line-label { font-weight: 500; }

.line-label {
  font-size: .85rem;
  color: var(--text-2);
  flex: 1;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
}

.line-note {
  font-size: .72rem;
  color: var(--text-3);
  font-weight: 400;
}

.line-rate {
  font-size: .72rem;
  color: var(--text-3);
  font-weight: 400;
  font-family: var(--mono);
}

.line-amount {
  font-family: var(--mono);
  font-size: .88rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  min-width: 56px;
  max-width: 80px;
  text-align: right;
  flex-shrink: 0;
}

/* Subtotals */
.bill-subtotal {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 10px;
  border-radius: var(--radius-xs);
  background: var(--surface-alt);
  font-size: .83rem;
  font-weight: 600;
  color: var(--text-2);
  margin-top: 6px;
  font-family: var(--mono);
}

.bill-subtotal--section {
  background: var(--accent-light);
  color: var(--accent);
  margin-top: 8px;
  font-size: .88rem;
}

/* Grand total */
.bill-grand-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--text);
  color: var(--surface);
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--mono);
  margin: 16px 0;
}

[data-theme="dark"] .bill-grand-total {
  background: var(--surface-alt);
  color: var(--text);
  border: 1.5px solid var(--border);
}

/* Price-To-Compare */
.ptc-box {
  background: var(--green-light);
  border: 1.5px solid rgba(5, 150, 105, .2);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
}

[data-theme="dark"] .ptc-box {
  border-color: rgba(63, 185, 80, .25);
}

.ptc-header {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 12px;
}

.ptc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 400px) {
  .ptc-grid {
    grid-template-columns: 1fr;
  }
}

.ptc-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.ptc-label {
  font-size: .7rem;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.ptc-dollars {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

.ptc-rate {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--green);
  word-break: break-all;
}

.ptc-sublabel {
  font-size: .7rem;
  color: var(--text-3);
}

.ptc-note {
  font-size: .74rem;
  color: var(--text-3);
  margin-top: 10px;
  font-style: italic;
}

/* Disclaimer */
.disclaimer {
  font-size: .72rem;
  color: var(--text-3);
  line-height: 1.6;
  padding: 12px;
  background: var(--surface-alt);
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--border);
}

/* Privacy note */
.privacy-note {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: .72rem;
  color: var(--text-3);
  background: var(--surface-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  margin-top: 14px;
  line-height: 1.4;
}

.privacy-note svg {
  width: 13px; height: 13px;
  flex-shrink: 0;
  color: var(--green);
  opacity: .8;
}

/* ── Mobile tweaks ────────────────────────────────────────────────── */
@media (max-width: 560px) {
  .layout { padding: 16px 12px 40px; gap: 14px; }
  .panel  { padding: 18px 14px; }
  .total-amount { font-size: 2.1rem; }
  .bill-subtotal { font-size: .78rem; padding: 6px 8px; }
  .bill-grand-total { font-size: .92rem; padding: 10px 12px; }
  .ptc-box { padding: 12px; }
  .ptc-rate { font-size: 1.05rem; }
  .ptc-dollars { font-size: 1rem; }
  .line-amount { font-size: .82rem; }
  .line-label  { font-size: .8rem; }
}

/* ── Print / PDF ──────────────────────────────────────────────────── */
.print-area { display: none; }

@media print {
  @page {
    size: letter portrait;
    margin: 0.75in 0.75in 0.75in 0.75in;
  }

  * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }

  /* Hide all screen UI — show only print-area */
  .site-header,
  .layout,
  .panel-input,
  .panel-breakdown,
  .export-btn,
  .share-group { display: none !important; }

  .print-area {
    display: block !important;
    font-family: 'DM Sans', Arial, sans-serif;
    font-size: 10pt;
    color: #000;
    width: 100%;
  }

  .print-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    border-bottom: 2pt solid #1d4ed8;
    padding-bottom: 8pt;
    margin-bottom: 12pt;
  }

  .print-logo { font-size: 14pt; font-weight: 700; color: #1d4ed8; }
  .print-date { font-size: 8pt; color: #555; }

  .print-meta {
    font-size: 9pt;
    color: #333;
    margin-bottom: 12pt;
    padding: 4pt 0;
    background: transparent;
    border-bottom: 0.5pt solid #e5e7eb;
  }

  .print-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 9pt;
    page-break-inside: avoid;
  }

  .print-body th,
  .print-body td {
    padding: 5pt 8pt;
    border: 0.5pt solid #d1d5db;
    text-align: left;
    vertical-align: middle;
  }

  .print-body thead tr th { background: #e8edf8; font-weight: 700; font-size: 8.5pt; }
  .print-body tr.subtotal  { background: #dbeafe; font-weight: 700; }
  .print-body tr.total     { background: #1d4ed8; color: #fff; font-weight: 700; font-size: 10pt; }
  .print-body tr.ptc       { background: #d1fae5; }

  .print-disclaimer {
    margin-top: 14pt;
    font-size: 7.5pt;
    color: #666;
    font-style: italic;
    border-top: 0.5pt solid #d1d5db;
    padding-top: 8pt;
    line-height: 1.5;
  }
}

/* ── Misc animations ──────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel { animation: fadeIn .35s ease both; }
.panel-input      { animation-delay: .04s; }
.panel-breakdown  { animation-delay: .1s; }