:root {
  --bg-top: #fff4df;
  --bg-bottom: #dff5ff;
  --card: #ffffff;
  --ink: #1f2a44;
  --muted: #53607d;
  --line: #d7e1f0;
  --brand: #ff7f50;
  --brand-strong: #ff5f2f;
  --ok: #21a67a;
  --bad: #dc5b6a;
  --sun: #ffca54;
  --sky: #8ec5ff;
  --jp-font: "Noto Sans JP", sans-serif;
  --ui-font: "Baloo 2", "Trebuchet MS", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--ui-font);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 85%);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  max-width: 920px;
  margin: 0 auto;
  padding: 20px 14px 34px;
}

.card {
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 20px;
  padding: 16px;
  box-shadow: 0 12px 28px rgba(27, 52, 88, 0.08);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.4rem, 3.4vw, 2rem);
}

.streak-pill {
  background: #fff8e8;
  border: 2px solid #ffd98d;
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 700;
  color: #8a5200;
}

.home-grid {
  display: grid;
  gap: 14px;
}

.intro-screen {
  max-width: 560px;
  margin: 18vh auto 0;
  text-align: center;
}

.intro-japanese {
  margin: 0;
  font-family: var(--jp-font);
  font-size: clamp(3.2rem, 11vw, 5.4rem);
  line-height: 1.05;
}

.intro-romaji {
  margin: 8px 0 12px;
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 700;
}

.hero {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  align-items: center;
}

.avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 3px solid #ffdca8;
  background: radial-gradient(circle at 30% 30%, #fff7df 0%, #ffd698 55%, #ffc571 100%);
  display: grid;
  place-items: center;
  font-size: 2.1rem;
}

.action-row {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

button {
  border: 2px solid transparent;
  border-radius: 14px;
  padding: 10px 14px;
  min-height: 46px;
  cursor: pointer;
}

.btn-main {
  background: var(--brand);
  color: #fff;
  font-weight: 700;
}

.btn-main:hover,
.btn-main:focus-visible {
  background: var(--brand-strong);
}

.btn-soft {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
  font-weight: 700;
}

.btn-soft:hover,
.btn-soft:focus-visible {
  border-color: #a9bad9;
}

.progress-wrap {
  display: grid;
  gap: 12px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  margin-bottom: 6px;
}

.progress-track {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: #edf2fb;
  overflow: hidden;
  border: 1px solid #d0ddef;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #6ddccf 0%, #46b99e 100%);
}

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

.learn-layout,
.practice-layout,
.progress-layout {
  display: grid;
  gap: 14px;
}

.learn-focus-card {
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
}

.alphabet-toggle,
.mode-toggle {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.practice-quick-menu {
  display: none;
}

.practice-quick-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.toggle-btn.active {
  background: var(--sky);
  border-color: #5da5f0;
  color: #173153;
}

.group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.group-card {
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 10px;
  background: #fbfdff;
}

.group-card.locked {
  opacity: 0.58;
}

.group-card h4 {
  margin: 0 0 8px;
}

.big-char {
  font-family: var(--jp-font);
  font-size: clamp(4rem, 14vw, 6rem);
  text-align: center;
  margin: 6px 0;
  line-height: 1;
}

.romaji {
  text-align: center;
  font-size: 1.7rem;
  font-weight: 700;
  margin: 6px 0;
}

.feedback {
  font-weight: 700;
  min-height: 1.4em;
}

.feedback.ok {
  color: var(--ok);
}

.feedback.bad {
  color: var(--bad);
}

.quiz-celebration {
  position: relative;
  border-radius: 16px;
  padding: 12px 12px 10px;
  margin-bottom: 10px;
  overflow: hidden;
  border: 2px solid #b8c8ea;
  animation: popIn 450ms ease-out;
}

.quiz-celebration.great {
  background: linear-gradient(145deg, #f0f9ff 0%, #ecfff6 100%);
  border-color: #89d3bf;
}

.quiz-celebration.perfect {
  background: linear-gradient(145deg, #fff4d9 0%, #fff8ec 40%, #eefcff 100%);
  border-color: #f5c565;
  box-shadow: 0 10px 24px rgba(245, 197, 101, 0.24);
}

.quiz-celebration.try-again {
  background: linear-gradient(145deg, #f4f8ff 0%, #fff8f8 100%);
  border-color: #c7d4ea;
}

.celebration-text {
  font-size: 1.06rem;
  font-weight: 700;
  margin: 4px 0 6px;
}

.confetti {
  position: absolute;
  width: 10px;
  height: 14px;
  border-radius: 4px;
  opacity: 0;
  animation: confettiDrop 900ms ease-out forwards;
}

.confetti-1 {
  left: 10%;
  top: -14px;
  background: #ff8da1;
  animation-delay: 80ms;
}

.confetti-2 {
  left: 48%;
  top: -16px;
  background: #61d6b0;
  animation-delay: 130ms;
}

.confetti-3 {
  left: 82%;
  top: -12px;
  background: #ffd166;
  animation-delay: 180ms;
}

@keyframes popIn {
  0% {
    transform: scale(0.95);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes confettiDrop {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  100% {
    transform: translateY(64px) rotate(130deg);
    opacity: 0;
  }
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.option-btn.correct {
  border-color: #0e9b6c;
  background: #e6fbf4;
}

.option-btn.wrong {
  border-color: #d0435a;
  background: #ffe9ee;
}

.circle-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.circle {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  border: 2px solid #b2c8ea;
  color: #143153;
}

.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(58px, 1fr));
  gap: 6px;
}

.char-pill {
  border-radius: 10px;
  border: 1px solid #cfdcf2;
  background: #fff;
  text-align: center;
  padding: 6px 4px;
}

.char-pill .jp {
  font-family: var(--jp-font);
  font-size: 1.4rem;
  line-height: 1;
}

.badge-grid {
  display: grid;
  gap: 8px;
}

.badge-item {
  border: 2px dashed #cfdbf0;
  border-radius: 12px;
  padding: 8px 10px;
  background: #fcfdff;
}

.badge-item.unlocked {
  border-style: solid;
  border-color: #ffd075;
  background: #fff8e8;
}

.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}

.day-cell {
  border-radius: 8px;
  border: 1px solid #cedaf0;
  padding: 8px 0;
  text-align: center;
  font-size: 0.8rem;
  background: #f3f7ff;
}

.day-cell.active {
  background: #b6f1df;
  border-color: #78ccaf;
}

@media (max-width: 720px) {
  .action-row {
    grid-template-columns: 1fr;
  }

  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .avatar {
    margin: 0 auto;
  }

  .options-grid {
    grid-template-columns: 1fr;
  }

  .learn-focus-card .action-row {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
}

@media (min-width: 1024px) {
  .practice-quick-menu {
    display: block;
    position: sticky;
    top: 10px;
    z-index: 20;
  }
}