:root {
  --ink: #15202b;
  --muted: #5c6b7a;
  --paper: #f3f6f8;
  --panel: rgba(255, 255, 255, 0.78);
  --line: rgba(21, 32, 43, 0.1);
  --accent: #0b6e4f;
  --accent-2: #1b4d6e;
  --drop: #0b6e4f;
  --rise: #a33b2b;
  --shadow: 0 18px 50px rgba(21, 32, 43, 0.08);
  --radius: 18px;
  --font: "DM Sans", sans-serif;
  --display: "Instrument Serif", Georgia, serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font);
  background: var(--paper);
}

body { position: relative; overflow-x: hidden; }

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 12% -10%, rgba(27, 77, 110, 0.22), transparent 60%),
    radial-gradient(700px 420px at 90% 8%, rgba(11, 110, 79, 0.18), transparent 55%),
    linear-gradient(180deg, #e8eef3 0%, #f3f6f8 45%, #eef3f0 100%);
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: scale(1) translateY(0); }
  to { transform: scale(1.03) translateY(-8px); }
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.75rem clamp(1.25rem, 4vw, 3rem) 0.5rem;
  animation: rise-in 0.7s ease both;
}

.brand { display: flex; gap: 0.9rem; align-items: center; }

.mark {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.7rem;
  background:
    linear-gradient(145deg, var(--accent-2), transparent 55%),
    linear-gradient(320deg, var(--accent), #163a2c);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.brand-name {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.brand-sub { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.95rem; }

.status {
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--muted);
  font-size: 0.85rem;
  backdrop-filter: blur(8px);
}

main {
  display: grid;
  gap: 1.25rem;
  padding: 1rem clamp(1.25rem, 4vw, 3rem) 3rem;
  max-width: 1100px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.35rem 1.4rem;
  backdrop-filter: blur(10px);
  animation: rise-in 0.8s ease both;
}

@keyframes rise-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

h2 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.7rem;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.lede { margin: 0.35rem 0 1rem; color: var(--muted); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.85rem;
}

.meta { color: var(--muted); font-size: 0.85rem; }

.watch-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

@media (min-width: 800px) {
  .watch-form { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  font: inherit;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.9);
  text-transform: none;
  letter-spacing: normal;
}

input:focus {
  outline: 2px solid rgba(11, 110, 79, 0.35);
  border-color: transparent;
}

.span-2 { grid-column: span 2; }
.span-all { grid-column: 1 / -1; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: end;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 0.75rem 1.15rem;
  font: inherit;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--accent), #0a5a41);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(11, 110, 79, 0.25);
}

button.ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  box-shadow: none;
}

button.danger {
  background: transparent;
  color: var(--rise);
  border: 1px solid rgba(163, 59, 43, 0.35);
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

button.tiny {
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.list { display: grid; gap: 0.65rem; }

.row {
  display: grid;
  gap: 0.35rem;
  padding: 0.9rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.row-top {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: baseline;
}

.price { font-variant-numeric: tabular-nums; font-weight: 700; }
.drop { color: var(--drop); }
.rise { color: var(--rise); }
.muted { color: var(--muted); font-size: 0.9rem; }
.empty { color: var(--muted); padding: 0.5rem 0; }

.airport-block {
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.55);
}

.airport-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.7rem;
}

.airport-head h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 400;
}

.chip-actions { display: flex; gap: 0.4rem; }

.airport-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.45rem;
}

.airport-chip {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  text-transform: none;
  letter-spacing: normal;
  font-size: 0.85rem;
  color: var(--ink);
}

.airport-chip:has(input:checked) {
  border-color: rgba(11, 110, 79, 0.45);
  background: rgba(11, 110, 79, 0.08);
}

.airport-chip input {
  width: auto;
  margin-top: 0.15rem;
  accent-color: var(--accent);
}

.airport-chip .code { font-weight: 700; }
.airport-chip .city { color: var(--muted); font-size: 0.78rem; }

.pair-count { margin: 0; color: var(--muted); font-size: 0.9rem; }

.route-stack { display: grid; gap: 0.25rem; margin-top: 0.35rem; }

.route-line {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.85rem;
}

.route-line.best { font-weight: 600; color: var(--accent); }

@media (max-width: 640px) {
  .top { flex-direction: column; }
  .watch-form { grid-template-columns: 1fr; }
  .span-2, .span-all { grid-column: span 1; }
}