*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --sky: #d4f1ff;
  --sky-light: #eaf8ff;
  --sky-deep: #a8dff5;
  --blue: #7ec8e3;
  --blue-soft: #b8e4f5;
  --pink: #ffb7d5;
  --pink-soft: #ffd6ea;
  --white: #feffff;
  --text: #4a7a8c;
  --text-light: #7aa8ba;
  --shadow: rgba(126, 200, 227, 0.35);
  --glow: rgba(255, 183, 213, 0.4);
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "DotGothic16", sans-serif;
  color: var(--text);
  background:
    radial-gradient(ellipse at 20% 0%, rgba(255, 214, 234, 0.5) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(184, 228, 245, 0.6) 0%, transparent 50%),
    linear-gradient(180deg, var(--sky-light) 0%, var(--sky) 40%, var(--sky-deep) 100%);
  background-attachment: fixed;
  line-height: 1.6;
  overflow-x: hidden;
}

.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255, 255, 255, 0.8) 50%, transparent 50%),
    radial-gradient(1px 1px at 30% 60%, rgba(255, 255, 255, 0.6) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 50% 10%, rgba(255, 183, 213, 0.7) 50%, transparent 50%),
    radial-gradient(1px 1px at 70% 40%, rgba(255, 255, 255, 0.7) 50%, transparent 50%),
    radial-gradient(1px 1px at 90% 80%, rgba(255, 255, 255, 0.5) 50%, transparent 50%),
    radial-gradient(1.5px 1.5px at 15% 85%, rgba(184, 228, 245, 0.8) 50%, transparent 50%),
    radial-gradient(1px 1px at 85% 15%, rgba(255, 255, 255, 0.6) 50%, transparent 50%),
    radial-gradient(1px 1px at 45% 75%, rgba(255, 183, 213, 0.5) 50%, transparent 50%);
  animation: twinkle 4s ease-in-out infinite alternate;
  z-index: 0;
}

@keyframes twinkle {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 1.2rem 1rem 0.8rem;
}

.subtitle {
  font-family: "DotGothic16", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--text-light);
  margin-bottom: 0.2rem;
}

h1 {
  font-family: "DotGothic16", sans-serif;
  font-size: clamp(1rem, 3.5vw, 1.35rem);
  font-weight: 400;
  color: var(--blue);
  text-shadow:
    0 0 12px var(--glow),
    1px 1px 0 var(--pink-soft);
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.desc {
  font-size: 0.7rem;
  color: var(--text-light);
}

.seo-intro {
  max-width: 520px;
  margin: 0.5rem auto 0;
  padding: 0 1rem;
  font-size: 0.62rem;
  line-height: 1.5;
  color: var(--text-light);
  opacity: 0.85;
}

main {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 0.75rem 3rem;
}

.category {
  margin-bottom: 1.5rem;
}

.category-title {
  font-family: "DotGothic16", sans-serif;
  font-size: 0.85rem;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  padding-left: 0.4rem;
  border-left: 2px solid var(--pink);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 0.35rem;
}

.char-card {
  position: relative;
}

.char-card.wide {
  grid-column: span 2;
}

.char-card.tall .char-btn {
  min-height: 56px;
}

.fav-btn {
  position: absolute;
  top: 2px;
  right: 2px;
  z-index: 2;
  width: 18px;
  height: 18px;
  padding: 0;
  border: none;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  font-family: "DotGothic16", sans-serif;
  font-size: 0.55rem;
  line-height: 1;
  color: var(--text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease, transform 0.15s ease, background 0.15s ease;
  box-shadow: 0 1px 4px var(--shadow);
}

.fav-btn:hover {
  color: var(--pink);
  transform: scale(1.1);
}

.fav-btn.active {
  color: var(--pink);
  background: var(--pink-soft);
}

.char-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 40px;
  padding: 0.3rem 0.2rem 0.3rem 0.15rem;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--blue-soft);
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  -webkit-touch-callout: none;
  touch-action: manipulation;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    border-color 0.15s ease,
    background 0.15s ease;
  backdrop-filter: blur(4px);
  box-shadow:
    0 2px 8px var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.char-btn:hover {
  transform: translateY(-2px) scale(1.02);
  border-color: var(--pink);
  background: rgba(255, 255, 255, 0.85);
  box-shadow:
    0 4px 16px var(--shadow),
    0 0 12px var(--glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.char-btn:active {
  transform: translateY(0) scale(0.98);
}

.char-text {
  font-family: "DotGothic16", sans-serif;
  font-size: 0.72rem;
  color: var(--text);
  text-align: center;
  white-space: pre-line;
  line-height: 1.3;
  word-break: break-all;
}

.char-btn.copied {
  border-color: var(--pink);
  background: var(--pink-soft);
  animation: pop 0.3s ease;
}

.char-btn.is-favorite {
  border-color: var(--pink);
  background: rgba(255, 214, 234, 0.45);
}

.favorites-section .category-title {
  border-left-color: var(--pink);
}

.favorites-empty {
  font-size: 0.7rem;
  color: var(--text-light);
  text-align: center;
  padding: 1rem 0.5rem;
  background: rgba(255, 255, 255, 0.45);
  border: 1px dashed var(--blue-soft);
  border-radius: 6px;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 1rem 1rem 2rem;
  font-family: "DotGothic16", sans-serif;
  font-size: 0.7rem;
  color: var(--text-light);
  letter-spacing: 0.1em;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: rgba(255, 255, 255, 0.92);
  border: 2px solid var(--pink);
  border-radius: 999px;
  padding: 0.5rem 1.2rem;
  font-family: "DotGothic16", sans-serif;
  font-size: 0.75rem;
  color: var(--blue);
  box-shadow: 0 4px 20px var(--shadow), 0 0 16px var(--glow);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 100;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
    gap: 0.3rem;
  }

  .char-card.wide {
    grid-column: span 2;
  }

  .char-text {
    font-size: 0.65rem;
  }

  .char-btn {
    min-height: 36px;
  }
}