:root {
  --navy: #0b2545;
  --sea: #13a4a4;
  --sand: #f4efe6;
  --coral: #ff6b57;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 0 2rem;
  background: var(--sand);
  color: var(--navy);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
header { background: var(--navy); color: var(--sand); padding: 0.9rem 1rem; }
h1 { margin: 0; font-size: 1.35rem; letter-spacing: 0.02em; }
.how { margin: 0.25rem 0 0; font-size: 0.9rem; opacity: 0.85; }
main { max-width: 34rem; margin: 0 auto; padding: 1rem; }
h2 { font-size: 1.05rem; margin: 0 0 0.6rem; }

button {
  font: inherit;
  min-height: 44px;
  padding: 0.6rem 1rem;
  border: 2px solid var(--navy);
  border-radius: 10px;
  background: #fff;
  color: var(--navy);
  cursor: pointer;
}
button:active { transform: translateY(1px); }

#modes { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
#modes button { flex: 1; }
#modes .on { background: var(--navy); color: var(--sand); }

#pickerList { display: grid; gap: 0.5rem; }
#pickerList button { width: 100%; text-align: left; }
#pickerList small { display: block; color: var(--sea); font-weight: 600; }

#bar {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 0.75rem; font-weight: 600;
}
#knotName { flex: 1; }
#progress { color: var(--sea); }
#timer {
  font-variant-numeric: tabular-nums;
  background: var(--navy); color: var(--sand);
  padding: 0.2rem 0.55rem; border-radius: 8px; min-width: 3.4rem; text-align: center;
}
#timer.pen { background: var(--coral); }

#cards { display: grid; gap: 0.5rem; }
.card {
  display: flex; align-items: center; gap: 0.7rem;
  width: 100%; min-height: 56px; text-align: left;
  background: #fff; border-color: rgba(11, 37, 69, 0.25);
}
.card svg { flex: 0 0 40px; color: var(--sea); }
.card .n {
  flex: 0 0 auto; width: 1.6rem; height: 1.6rem; line-height: 1.6rem;
  text-align: center; border-radius: 50%; background: var(--sea); color: #fff; font-weight: 700;
}
.card.done { background: var(--sea); border-color: var(--sea); color: #fff; opacity: 0.75; }
.card.done svg { color: #fff; }
.card.done .n { background: #fff; color: var(--sea); }
.card.wrong { border-color: var(--coral); animation: shake 0.32s; }
@keyframes shake {
  20% { transform: translateX(-7px); } 40% { transform: translateX(7px); }
  60% { transform: translateX(-4px); } 80% { transform: translateX(4px); }
}
@media (prefers-reduced-motion: reduce) { .card.wrong { animation: none; } }

#tip {
  margin-top: 1rem; padding: 0.9rem;
  background: #fff; border-left: 5px solid var(--coral); border-radius: 8px;
}
#tip p { margin: 0 0 0.8rem; }
#tip button { width: 100%; background: var(--navy); color: var(--sand); }

#resultLines {
  font: inherit; white-space: pre-wrap; background: #fff;
  padding: 0.8rem; border-radius: 8px; margin: 0 0 0.8rem;
}
#best { color: var(--sea); font-weight: 600; }
#share { background: var(--coral); border-color: var(--coral); color: #fff; }
#result button { width: 100%; margin-bottom: 0.5rem; }
#shareBox { width: 100%; font: inherit; padding: 0.5rem; margin-bottom: 0.5rem; }

footer { text-align: center; padding: 1.5rem 1rem 0; }
footer a { color: var(--navy); }