:root {
  --bg: #0B1220;
  --surface: #121B2E;
  --surface-2: #16223A;
  --line: #23324D;
  --text: #E7ECF3;
  --text-muted: #8592A6;
  --teal: #2DD4BF;
  --amber: #F5A623;
  --red: #F2545B;
  --font-ui: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 18, 32, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  background: var(--teal);
  color: #05221E;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.brand__name { font-weight: 800; letter-spacing: 0.2px; }
.topnav { display: flex; gap: 28px; }
.topnav__link {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}
.topnav__link--active,
.topnav__link:hover { color: var(--text); border-bottom-color: var(--teal); }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 40px; border-bottom: 1px solid var(--line); }
.hero__row {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-mono);
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 12px;
  margin: 0 0 14px;
}
.hero__title {
  font-size: 42px;
  line-height: 1.12;
  margin: 0 0 18px;
  font-weight: 800;
  letter-spacing: -0.5px;
}
.hero__sub { color: var(--text-muted); font-size: 16px; line-height: 1.6; max-width: 46ch; }

/* Flipboard signature element */
.hero__panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  font-family: var(--font-mono);
}
.flip-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 8px;
  border-bottom: 1px dashed var(--line);
}
.flip-row:last-child { border-bottom: none; }
.flip-row__pair { color: var(--text-muted); font-size: 13px; letter-spacing: 0.5px; }
.flip-row__value { display: flex; gap: 3px; }
.flip-digit {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 3px;
  min-width: 16px;
  text-align: center;
  padding: 4px 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--amber);
}

/* ---------- Controls ---------- */
.controls {
  display: flex;
  align-items: flex-end;
  gap: 14px;
  padding: 40px 0 20px;
  flex-wrap: wrap;
}
.controls__field { display: flex; flex-direction: column; gap: 6px; }
.controls__field label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
select {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  min-width: 140px;
}
.swap-btn {
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--teal);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  align-self: center;
  margin-bottom: 2px;
}
.swap-btn:hover { border-color: var(--teal); }
.refresh-btn {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-muted);
  padding: 10px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
.refresh-btn:hover { color: var(--text); border-color: var(--teal); }

/* ---------- Table ---------- */
.table-wrap {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 60px;
  background: var(--surface);
}
.board-table { width: 100%; border-collapse: collapse; }
.board-table thead th {
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: var(--text-muted);
  padding: 12px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.board-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  vertical-align: middle;
}
.board-table tbody tr:last-child td { border-bottom: none; }
.board-table tbody tr:hover { background: rgba(45, 212, 191, 0.04); }
.col-rank { font-family: var(--font-mono); color: var(--text-muted); width: 36px; }
.row-rank--top1 .col-rank { color: var(--amber); font-weight: 700; }
.exch-name { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.verified-badge {
  font-size: 10px;
  color: #05221E;
  background: var(--teal);
  padding: 1px 6px;
  border-radius: 3px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.rating-pill {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
}
.rating-count { color: var(--text-muted); font-size: 12px; margin-left: 4px; }
.rate-value { font-family: var(--font-mono); font-weight: 600; color: var(--teal); }
.limits, .reserve { color: var(--text-muted); font-family: var(--font-mono); font-size: 13px; }
.go-btn {
  background: var(--teal);
  color: #05221E;
  border: none;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}
.go-btn:hover { filter: brightness(1.08); }
.board-empty { text-align: center; padding: 40px; color: var(--text-muted); }

/* ---------- How it works ---------- */
.section-title { font-size: 26px; font-weight: 800; margin: 0 0 24px; }
.how { padding: 50px 0; border-top: 1px solid var(--line); }
.how__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.how__card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
}
.how__num {
  display: block;
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 10px;
}
.how__card p { margin: 0; color: var(--text-muted); font-size: 14px; line-height: 1.6; }

.for-exchangers { padding: 50px 0 70px; border-top: 1px solid var(--line); color: var(--text-muted); }

.footer { border-top: 1px solid var(--line); padding: 24px 0; color: var(--text-muted); font-size: 13px; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(5, 9, 16, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 28px;
  position: relative;
}
.modal__close {
  position: absolute; top: 14px; right: 14px;
  background: transparent; border: none; color: var(--text-muted);
  font-size: 18px; cursor: pointer;
}
.modal h3 { margin: 0 0 4px; font-size: 20px; }
.modal .modal-url { color: var(--text-muted); font-size: 13px; margin-bottom: 16px; }
.review-item { border-bottom: 1px solid var(--line); padding: 12px 0; }
.review-item:last-child { border-bottom: none; }
.review-item__head { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 4px; }
.review-item__author { font-weight: 600; }
.review-item__rating { color: var(--amber); font-family: var(--font-mono); }
.review-item__comment { color: var(--text-muted); font-size: 14px; margin: 0; }
.review-form { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 16px; }
.review-form input, .review-form textarea {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 9px 10px;
  border-radius: 6px;
  font-family: var(--font-ui);
  font-size: 14px;
  margin-bottom: 10px;
}
.review-form textarea { min-height: 70px; resize: vertical; }
.star-select { display: flex; gap: 6px; margin-bottom: 12px; }
.star-select button {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-muted);
  width: 34px; height: 34px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 15px;
}
.star-select button.active { color: var(--amber); border-color: var(--amber); }
.review-submit {
  background: var(--teal);
  color: #05221E;
  border: none;
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: 700;
  cursor: pointer;
}
.form-msg { font-size: 13px; margin-top: 8px; }
.form-msg--error { color: var(--red); }
.form-msg--ok { color: var(--teal); }

@media (max-width: 780px) {
  .hero__row { grid-template-columns: 1fr; }
  .how__grid { grid-template-columns: 1fr; }
  .hero__title { font-size: 32px; }
  .refresh-btn { margin-left: 0; }
  .board-table { font-size: 13px; }
  .col-reserve, .col-limits { display: none; }
}

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