:root {
  --bg: #f3f7f2;
  --card: #fffefb;
  --ink: #1f2a25;
  --muted: #5c7167;
  --accent: #1f6b57;
  --accent-soft: #d8eee6;
  --danger: #aa2a2a;
  --ok: #2a8c3f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, sans-serif;
  background:
    radial-gradient(circle at 10% 0%, #e8f8f1 0%, transparent 40%),
    radial-gradient(circle at 90% 100%, #f8efe0 0%, transparent 35%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.5;
}

.app {
  max-width: 560px;
  margin: 0 auto;
  padding: 1.2rem;
}

.card {
  background: var(--card);
  border: 1px solid #dde6df;
  border-radius: 20px;
  padding: 1.1rem;
  box-shadow: 0 16px 30px rgba(18, 56, 43, 0.08);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

h1,
h2 {
  margin-top: 0;
  letter-spacing: 0.01em;
}

.audio-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.25rem;
}

.title-wrap {
  display: inline-block;
  position: relative;
  vertical-align: middle;
}

.stack {
  display: grid;
  gap: 0.75rem;
}

.compact {
  margin-top: 1.15rem;
}

label {
  display: grid;
  gap: 0.3rem;
  font-weight: 600;
}

input {
  width: 100%;
  border: 1px solid #c6d8ce;
  border-radius: 12px;
  padding: 0.8rem;
  font-size: 1rem;
  background: #fff;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

input.correct {
  border-color: var(--ok);
  color: var(--ok);
  font-weight: 700;
}

.sr-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
}

.slots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.22rem;
  align-items: center;
  min-height: 2.2rem;
  padding: 0.2rem 0.1rem;
  cursor: text;
}

.inline-title-slots {
  display: inline-flex;
  margin: 0 0.35rem;
}

.slot-char {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-size: 1.02rem;
  min-width: 0.75rem;
  text-align: center;
  color: #24342d;
  border-bottom: 1.6px solid #8ca89a;
  line-height: 1.4;
  position: relative;
}

.slot-char.empty {
  color: transparent;
}

.slot-char.filled {
  color: #1f2a25;
}

.slots.correct .slot-char {
  color: var(--ok);
  border-bottom-color: var(--ok);
  font-weight: 700;
}

.slots.correct .slot-letter {
  color: var(--ok);
}

.slots.wrong .slot-char {
  color: var(--danger);
  border-bottom-color: var(--danger);
}

.slots.wrong .slot-letter {
  color: var(--danger);
}

.slot-gap {
  width: 0.85rem;
  height: 1.4rem;
}

.slot-strike .slot-letter {
  text-decoration: line-through;
}

.slot-a {
  position: absolute;
  top: -0.72rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.78rem;
  font-weight: 800;
  color: #1f6b57;
  line-height: 1;
}

.slot-cursor::after {
  content: "";
  position: absolute;
  left: calc(50% - 0.6px);
  bottom: 0.1rem;
  width: 1.2px;
  height: 1.2rem;
  background: #111;
  animation: blink-caret 0.95s steps(1, end) infinite;
}

@keyframes blink-caret {
  0%,
  49% {
    opacity: 1;
  }
  50%,
  100% {
    opacity: 0;
  }
}

button {
  border: 0;
  background: var(--accent);
  color: #fff;
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  transition: transform 120ms ease, opacity 120ms ease;
}

button:active {
  transform: translateY(1px);
}

.hidden {
  display: none;
}

.icon-btn {
  font-size: 1.2rem;
  width: 3.2rem;
  height: 3.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 999px;
}

.mini-toggle {
  background: #101010;
  color: #fff;
  border-radius: 999px;
  padding: 0.34rem 0.65rem;
  font-size: 0.74rem;
  line-height: 1;
  min-height: 1.8rem;
}

.error {
  min-height: 1.2rem;
  color: var(--danger);
  margin: 0;
}

.muted,
.progress {
  color: var(--muted);
}

#skip-btn {
  background: #e9f3ee;
  color: #1f5f4f;
  margin-top: 1rem;
}

#check-answer-btn {
  margin-top: 0.45rem;
}

#success-wrap {
  margin-top: 0.9rem;
  cursor: pointer;
}

#next-btn {
  margin-top: 0.7rem;
}

.gif-wrap img {
  width: 100%;
  border-radius: 14px;
  border: 1px solid #d9e5de;
  background: #eef3ef;
  min-height: 160px;
  object-fit: cover;
}

.solution {
  font-size: 1.2rem;
}

.xp {
  margin-top: -0.45rem;
  margin-bottom: 0.85rem;
  color: #1f6b57;
  font-weight: 800;
}

@media (min-width: 700px) {
  .app {
    padding-top: 2.2rem;
  }

  .card {
    padding: 1.7rem;
  }
}