:root {
  --bg: #0b1020;
  --bg-2: #11183a;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #e8ecf5;
  --muted: #9aa4bd;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --accent: #22d3ee;
  --radius: 18px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, "Noto Sans", "Noto Sans Arabic", "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(139, 92, 246, 0.25), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, rgba(34, 211, 238, 0.18), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.5;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  max-width: 1080px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 26px; }
.brand-name { font-weight: 800; font-size: 20px; letter-spacing: 0.3px; }
.brand-tag { color: var(--muted); font-size: 13px; padding-left: 10px; border-left: 1px solid var(--card-border); }

.lang-switch select {
  background: var(--card); color: var(--text);
  border: 1px solid var(--card-border); border-radius: 12px;
  padding: 9px 12px; font-size: 14px; cursor: pointer; outline: none;
}
.lang-switch select:focus { border-color: var(--primary); }

/* Layout */
.container { max-width: 720px; margin: 0 auto; padding: 10px 20px 60px; }

.hero { text-align: center; margin: 30px 0 26px; }
.hero h1 { font-size: clamp(28px, 5vw, 42px); margin: 0 0 10px; font-weight: 800; letter-spacing: -0.5px; }
.subtitle { color: var(--muted); margin: 0 auto; max-width: 520px; font-size: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  margin-bottom: 22px;
}

/* Converter */
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 13px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.6px; }

#amount {
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-border);
  color: var(--text); font-size: 28px; font-weight: 700; border-radius: 14px;
  padding: 14px 16px; outline: none; width: 100%;
}
#amount:focus { border-color: var(--primary); }

.pair { display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: end; margin-top: 18px; }

.select-wrap { position: relative; display: flex; align-items: center; }
.select-wrap .flag { position: absolute; left: 14px; font-size: 20px; pointer-events: none; }
.select-wrap select {
  width: 100%; background: rgba(255,255,255,0.06); color: var(--text);
  border: 1px solid var(--card-border); border-radius: 14px;
  padding: 14px 14px 14px 44px; font-size: 15px; cursor: pointer; outline: none;
  appearance: none;
}
.select-wrap select:focus { border-color: var(--primary); }

.swap-btn {
  height: 52px; width: 52px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; border: none; font-size: 22px; cursor: pointer;
  display: grid; place-items: center; transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 8px 24px rgba(99,102,241,0.4);
}
.swap-btn:hover { transform: rotate(180deg) scale(1.05); }

.result { margin-top: 24px; text-align: center; }
.result-amount { font-size: clamp(26px, 6vw, 38px); font-weight: 800; }
.result-rate { color: var(--muted); margin-top: 6px; font-size: 15px; }
.updated { text-align: center; color: var(--muted); font-size: 12px; margin-top: 14px; opacity: 0.8; }

/* Panels */
.panel h2 { margin: 0 0 4px; font-size: 18px; }
.panel-sub { color: var(--muted); font-size: 13px; margin: 0 0 14px; }

.chart-wrap { width: 100%; }
#chart { width: 100%; height: 220px; display: block; }

/* Popular */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.popular-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
.popular-item {
  text-align: left; background: rgba(255,255,255,0.05); border: 1px solid var(--card-border);
  border-radius: 14px; padding: 14px; cursor: pointer; color: var(--text); transition: border-color 0.15s, transform 0.15s;
}
.popular-item:hover { border-color: var(--primary); transform: translateY(-2px); }
.popular-pair { font-weight: 700; font-size: 15px; }
.popular-rate { color: var(--muted); font-size: 13px; margin-top: 4px; }

.disclaimer { color: var(--muted); font-size: 12px; text-align: center; line-height: 1.6; padding: 0 10px; }

/* Footer */
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 20px; }
.footer .dot { margin: 0 8px; }

/* Features */
.features { margin-bottom: 22px; }
.features-title { text-align: center; font-size: 22px; margin: 4px 0 18px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature { padding: 22px 20px; text-align: center; }
.feature-icon { font-size: 30px; margin-bottom: 8px; }
.feature h3 { margin: 0 0 8px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* Currency grid */
.currency-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.currency-item {
  display: flex; align-items: center; gap: 10px; text-align: left;
  background: rgba(255,255,255,0.05); border: 1px solid var(--card-border);
  border-radius: 12px; padding: 11px 13px; cursor: pointer; color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
}
.currency-item:hover { border-color: var(--primary); transform: translateY(-2px); }
.currency-item.active { border-color: var(--primary); background: rgba(99,102,241,0.15); }
.ci-flag { font-size: 20px; }
.ci-code { font-weight: 700; font-size: 14px; }
.ci-name { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Footer links */
.footer-links { margin-bottom: 8px; }
.footer-links a { color: var(--text); text-decoration: none; font-size: 14px; }
.footer-links a:hover { color: var(--primary); }
.footer-note { font-size: 12px; }

/* Status bar */
.status { display: none; margin-top: 10px; font-size: 13px; padding: 8px 12px; border-radius: 10px; }
.status:not(:empty) { display: block; }
.status-loading { background: rgba(255,255,255,0.06); color: var(--muted); }
.status-ok { background: rgba(34,197,94,0.14); color: #4ade80; }
.status-warn { background: rgba(250,204,21,0.14); color: #facc15; }
.status-err { background: rgba(239,68,68,0.14); color: #f87171; }
.retry-btn { margin-left: 8px; background: var(--primary); color: #fff; border: none; border-radius: 8px; padding: 4px 12px; cursor: pointer; font-size: 12px; font-weight: 700; }

/* Topbar actions */
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.theme-btn {
  background: var(--card); border: 1px solid var(--card-border);
  color: var(--text); border-radius: 12px; width: 42px; height: 42px;
  font-size: 18px; cursor: pointer; line-height: 1;
}
.theme-btn:hover { border-color: var(--primary); }

/* Combobox */
.combobox { position: relative; display: flex; align-items: center; }
.combobox .flag { position: absolute; left: 14px; font-size: 20px; pointer-events: none; z-index: 1; }
.cb-toggle {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  background: rgba(255,255,255,0.06); color: var(--text);
  border: 1px solid var(--card-border); border-radius: 14px;
  padding: 14px 14px 14px 44px; font-size: 15px; font-weight: 700; cursor: pointer; outline: none;
}
.cb-toggle:focus { border-color: var(--primary); }
.cb-caret { opacity: 0.6; font-size: 12px; }
.cb-menu {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 30;
  background: #0f1530; border: 1px solid var(--card-border); border-radius: 14px;
  padding: 8px; box-shadow: var(--shadow); max-height: 280px; overflow: hidden;
  display: flex; flex-direction: column;
}
.cb-menu[hidden] { display: none; }
.cb-search {
  background: rgba(255,255,255,0.08); border: 1px solid var(--card-border);
  color: var(--text); border-radius: 10px; padding: 10px 12px; font-size: 14px;
  outline: none; margin-bottom: 6px;
}
.cb-list { list-style: none; margin: 0; padding: 0; overflow-y: auto; }
.cb-option {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 10px;
  cursor: pointer; font-size: 14px;
}
.cb-option:hover { background: rgba(255,255,255,0.06); }
.cb-option.selected { background: rgba(99,102,241,0.22); }
.cb-option .ci-name { color: var(--muted); font-size: 12px; }

/* Grid search */
.grid-search-wrap { position: relative; margin-bottom: 14px; }
.grid-search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); font-size: 14px; opacity: 0.6; }
.grid-search {
  width: 100%; background: rgba(255,255,255,0.06); border: 1px solid var(--card-border);
  color: var(--text); border-radius: 12px; padding: 12px 14px 12px 40px; font-size: 14px; outline: none;
}
.grid-search:focus { border-color: var(--primary); }

/* Light theme */
:root[data-theme="light"] {
  --bg: #eef2fb;
  --bg-2: #e7ecf7;
  --card: rgba(255,255,255,0.92);
  --card-border: rgba(15,23,42,0.10);
  --text: #0f172a;
  --muted: #5b6678;
}
:root[data-theme="light"] body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(139,92,246,0.18), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, rgba(34,211,238,0.14), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
}
:root[data-theme="light"] .cb-menu { background: #ffffff; }
:root[data-theme="light"] .cb-search,
:root[data-theme="light"] .grid-search,
:root[data-theme="light"] #amount,
:root[data-theme="light"] .cb-toggle { background: rgba(15,23,42,0.04); }

@media (max-width: 520px) {
  .pair { grid-template-columns: 1fr; }
  .swap-btn { justify-self: center; transform: rotate(90deg); }
  .swap-btn:hover { transform: rotate(270deg) scale(1.05); }
  .brand-tag { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .currency-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}