:root {
  color-scheme: light dark;
  --bg: #f4f5fb;
  --fg: #111323;
  --muted: #6d7086;
  --accent: #0f6fff;
  --card-bg: rgba(255, 255, 255, 0.9);
  --border: rgba(0, 0, 0, 0.08);
  font-size: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f111b;
    --fg: #f5f7ff;
    --muted: #9497b2;
    --card-bg: rgba(24, 26, 40, 0.9);
    --border: rgba(255, 255, 255, 0.12);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "SF Pro", "PingFang SC", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.search-panel {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  align-items: stretch;
}

.search-panel h1 {
  margin: 0;
  font-size: clamp(1.8rem, 2.3rem, 2.6rem);
  letter-spacing: 0.02em;
}

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

.search-form {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.search-form input[type="text"] {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 1rem;
  background: #fff;
  color: #111;
  box-shadow: 0 12px 32px rgba(15, 19, 34, 0.08);
  line-height: 1.2;
  height: 3rem;
}

@media (prefers-color-scheme: dark) {
  .search-form input[type="text"] {
    background: #fff;
    color: #111;
    border-color: rgba(0, 0, 0, 0.35);
  }
}

@media (max-width: 640px) {
  .search-form input[type="text"] {
    height: 2.8rem;
    font-size: 1rem;
    padding: 0.65rem 0.9rem;
  }
}

.search-form button {
  flex: 0 0 auto;
  padding: 0.8rem 1.8rem;
  border-radius: 12px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(15, 19, 34, 0.12);
}

.search-form button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.result-panel {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 3.5vw, 3rem);
}

.placeholder {
  font-size: 1rem;
  color: var(--muted);
  text-align: center;
}

.kanji-card {
  width: min(520px, 100%);
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: 24px;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  box-shadow: 0 25px 50px rgba(15, 19, 34, 0.15);
}

.kanji-main {
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.kanji-char {
  font-size: clamp(4rem, 20vw, 6.5rem);
  line-height: 1;
  font-weight: 600;
}

.kanji-gif {
  width: min(260px, 70vw);
  border-radius: 20px;
  background: #fff;
  border: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.kanji-gif img {
  width: 100%;
  height: auto;
  display: block;
}

.kanji-meta {
  display: grid;
  gap: 0.4rem;
  justify-items: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.error-state {
  color: #d14545;
  font-weight: 500;
  text-align: center;
}

@media (max-width: 640px) {
  .search-form {
    flex-direction: column;
    align-items: stretch;
  }

  .search-form button {
    width: 100%;
  }
}