* {
  box-sizing: border-box;
}

:root {
  --bg: #f2f6fb;
  --card-bg: #ffffff;
  --card-border: #e4ebf3;
  --text-main: #1a2330;
  --text-sub: #4a5a6c;
  --text-muted: #5b6e83;
  --focus: #7aa0ff;
  --focus-ring: #99b6ff;
  --shadow-soft: 0 10px 26px rgba(18, 38, 63, 0.06);
}

body {
  margin: 0;
  font-family: "Segoe UI", "Microsoft JhengHei", sans-serif;
  background: radial-gradient(circle at top, #f7faff 0%, var(--bg) 35%, #eef3f9 100%);
  color: var(--text-main);
  line-height: 1.4;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 18px 36px;
}

.app-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  padding: 4px 2px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 1.72rem;
  letter-spacing: 0.01em;
}

.app-header p {
  margin: 0;
  color: var(--text-sub);
}

.logo {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  box-shadow: 0 6px 14px rgba(41, 73, 122, 0.16);
}

.card {
  background: var(--card-bg);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 18px;
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-soft);
}

.card h2 {
  margin-top: 0;
  margin-bottom: 14px;
  font-size: 1.2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.trade-grid .field-shares {
  grid-column: 1 / -1;
}

.trade-grid .field-buy-price,
.trade-grid .field-sell-price {
  grid-column: span 1;
}

.trade-grid .field-market.field-market-full {
  grid-column: 1 / -1;
}

.trade-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.fx-toggle {
  border: 1px solid #cfdaea;
  background: #fff;
  color: #27415d;
  border-radius: 10px;
  font-size: 0.87rem;
  padding: 8px 11px;
  min-height: 38px;
  cursor: pointer;
  transition: background-color 0.16s ease, border-color 0.16s ease, transform 0.16s ease, box-shadow 0.16s ease;
}

.fx-toggle:hover {
  background: #f2f7ff;
  border-color: #b8cbec;
  box-shadow: 0 4px 10px rgba(67, 110, 173, 0.12);
}

.fx-toggle:active {
  transform: translateY(1px);
}

.fx-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 7px;
  font-size: 0.93rem;
  color: #314256;
  font-weight: 500;
}

input,
select {
  width: 100%;
  border: 1px solid #cad5e3;
  border-radius: 10px;
  padding: 12px 13px;
  min-height: 46px;
  font-size: 16px;
  background: #fff;
  color: var(--text-main);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.toggle-source-select {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

.toggle-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.toggle-single {
  display: block;
}

.toggle-btn {
  border: 1px solid #cad5e3;
  background: #fff;
  color: #314256;
  border-radius: 10px;
  min-height: 42px;
  padding: 8px 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease;
}

.toggle-btn-single {
  width: 100%;
  text-align: left;
  padding-left: 12px;
  border-color: #7aa0ff;
  background: #edf4ff;
  color: #1f3f73;
  box-shadow: 0 0 0 2px rgba(122, 160, 255, 0.14);
}

.toggle-btn:hover {
  border-color: #b8cbec;
  background: #f4f8ff;
}

.toggle-btn.active {
  border-color: #7aa0ff;
  background: #edf4ff;
  color: #1f3f73;
  box-shadow: 0 0 0 2px rgba(122, 160, 255, 0.14);
}

.toggle-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.shares-quick {
  display: flex;
  gap: 6px;
  flex-wrap: nowrap;
  flex: 0 0 auto;
}

.shares-inline {
  display: flex;
  align-items: center;
  gap: 8px;
}

.shares-inline input {
  flex: 1 1 auto;
  min-width: 0;
}

.shares-slider-wrap {
  margin-top: 8px;
}

.shares-slider {
  width: 100%;
  accent-color: #5f8df7;
}

.shares-slider-meta {
  margin-top: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #5f6f84;
  font-size: 0.76rem;
}

.shares-slider-meta strong {
  color: #2c4666;
  font-size: 0.8rem;
}

.shares-quick-btn {
  border: 1px solid #cfdaea;
  background: #fff;
  color: #32506f;
  border-radius: 999px;
  min-height: 28px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.shares-quick-btn:hover {
  border-color: #a9c3ec;
  background: #f1f7ff;
}

.shares-quick-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

input:focus,
select:focus {
  outline: 2px solid var(--focus-ring);
  border-color: var(--focus);
  box-shadow: 0 0 0 4px rgba(122, 160, 255, 0.14);
}

.field-invalid {
  border-color: #d24a45;
  box-shadow: 0 0 0 4px rgba(210, 74, 69, 0.12);
}

.field-error {
  margin-top: -1px;
  min-height: 16px;
  font-size: 0.78rem;
  color: #b3261e;
  font-weight: 500;
}

.hidden {
  display: none;
}

.summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.summary article {
  padding: 12px;
  border-radius: 12px;
  background: #f7f9fc;
  border: 1px solid #e2eaf3;
  min-height: 84px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.summary article:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(31, 62, 105, 0.08);
}

.summary span {
  display: block;
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.summary strong {
  font-size: 1.08rem;
}

.summary-primary {
  background: linear-gradient(160deg, #f4f9ff 0%, #edf5ff 100%);
  border-color: #d7e8ff;
}

.summary strong,
.fee-list li span:last-child,
.fee-total span,
.mobile-key-metrics strong {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.fx-conversion {
  margin-bottom: 14px;
}

.fx-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 12px;
}

.fx-toggle[aria-expanded="false"] .fx-toggle-icon {
  transform: rotate(-90deg);
}

.fx-toggle-icon {
  transition: transform 0.16s ease;
}

.fx-meta {
  margin: 0 0 10px;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.positive {
  color: #117a44;
}

.negative {
  color: #b3261e;
}

.fee-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.fee-columns h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1rem;
}

.fee-list {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  border: 1px solid #e2eaf3;
  border-radius: 12px;
  overflow: hidden;
  background: #f8fbff;
}

.fee-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid #edf2f7;
  font-size: 0.92rem;
}

.fee-list li span:first-child {
  flex: 1;
}

.fee-list li span:last-child {
  text-align: right;
  white-space: nowrap;
  font-weight: 600;
}

.fee-list li:last-child {
  border-bottom: 0;
}

.fee-total {
  margin: 0;
  color: #2f4154;
  font-weight: 600;
}

.disclaimer {
  margin-top: 12px;
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

#inputSection,
#resultSection {
  scroll-margin-top: 64px;
}

.mobile-key-metrics {
  display: none;
}

@media (max-width: 768px) {
  .container {
    padding: 12px 10px calc(92px + env(safe-area-inset-bottom, 0));
  }

  .app-header {
    gap: 10px;
    margin-bottom: 12px;
  }

  .logo {
    width: 44px;
    height: 44px;
    border-radius: 10px;
  }

  .app-header h1 {
    font-size: 1.28rem;
  }

  .app-header p {
    font-size: 0.92rem;
  }

  .card {
    border-radius: 12px;
    padding: 13px;
    margin-bottom: 12px;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .trade-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .trade-grid .field-market {
    order: 1;
    grid-column: span 1;
  }

  .trade-grid .field-instrument {
    order: 2;
    grid-column: span 1;
  }

  .trade-grid .field-shares {
    order: 5;
    grid-column: 1 / -1;
  }

  .trade-grid .field-buy-price {
    order: 3;
    grid-column: span 1;
  }

  .trade-grid .field-sell-price {
    order: 4;
    grid-column: span 1;
  }

  .toggle-btn {
    min-height: 40px;
    font-size: 0.87rem;
  }

  .shares-inline {
    gap: 6px;
  }

  .summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .summary article {
    padding: 10px;
    min-height: 78px;
  }

  .summary article.summary-primary {
    display: none;
  }

  .fx-summary .fx-net-profit-hkd {
    display: none;
  }

  .summary strong {
    font-size: 1rem;
    word-break: break-word;
  }

  .fee-columns {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .fee-list li {
    padding: 11px 10px;
  }

  .mobile-key-metrics {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom, 0));
    z-index: 20;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 8px;
    border-radius: 12px;
    border: 1px solid #d9e7fb;
    background: rgba(248, 252, 255, 0.95);
    backdrop-filter: blur(6px);
    box-shadow: 0 8px 20px rgba(31, 62, 105, 0.14);
  }

  .mobile-key-metrics article {
    background: #fff;
    border: 1px solid #e1ecf8;
    border-radius: 10px;
    padding: 8px 9px;
  }

  .mobile-key-metrics span {
    display: block;
    color: var(--text-muted);
    font-size: 0.76rem;
    margin-bottom: 4px;
  }

  .mobile-key-metrics strong {
    font-size: 1rem;
  }

  .mobile-metric-net-profit {
    order: 1;
  }

  .mobile-metric-net-profit-hkd {
    order: 2;
  }

  .mobile-metric-roi {
    order: 3;
  }

  .mobile-metric-total-fees {
    order: 4;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }

  .fx-toggle,
  .summary article {
    transition: none;
  }
}

@media (max-width: 420px) {
  .app-header {
    align-items: flex-start;
  }

  .app-header h1 {
    font-size: 1.18rem;
  }

  .summary {
    grid-template-columns: 1fr;
  }

  .trade-grid {
    grid-template-columns: 1fr;
  }

  .trade-grid .field-market,
  .trade-grid .field-instrument,
  .trade-grid .field-buy-price,
  .trade-grid .field-sell-price {
    grid-column: 1 / -1;
  }
}