:root {
  --bg1: #0f172a; /* slate-900 */
  --bg2: #111827; /* gray-900 */
  --card: #0b1220cc;
  --stroke: #ffffff1f;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --accent: #2563eb;
}

:root.light-mode {
  --bg1: #f8fafc; /* slate-50 */
  --bg2: #f1f5f9; /* slate-100 */
  --card: #ffffffcc;
  --stroke: #e2e8f0;
  --text: #1e293b; /* slate-800 */
  --muted: #64748b; /* slate-500 */
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(900px 600px at 20% 20%, #2563eb22, transparent 60%),
    radial-gradient(700px 500px at 80% 30%, #22c55e1f, transparent 55%),
    linear-gradient(135deg, var(--bg1), var(--bg2));
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Apple SD Gothic Neo",
    "Malgun Gothic", "Noto Sans KR", Segoe UI, Roboto, Helvetica, Arial;
  padding: 24px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.wrap {
  width: min(720px, 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.card {
  width: 100%;
  padding: 28px 26px;
  border: 1px solid var(--stroke);
  border-radius: 22px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  cursor: pointer;
  user-select: none;
  position: relative;
  overflow: hidden;
  transition: transform 0.12s ease, border-color 0.2s ease, background-color 0.3s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #ffffff33;
}

.light-mode .card:hover {
  border-color: #0000001a;
}

.card:active {
  transform: translateY(0px) scale(0.99);
}

.shine {
  position: absolute;
  inset: -80px -80px auto auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle at 30% 30%, #ffffff22, transparent 65%);
  transform: rotate(15deg);
  pointer-events: none;
}

.quote {
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.35;
  letter-spacing: -0.2px;
  margin: 0 0 14px 0;
}

.meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: #00000022;
  white-space: nowrap;
}

.light-mode .tag {
  background: #ffffff88;
}

.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono";
  font-size: 12px;
  padding: 2px 7px;
  border: 1px solid var(--stroke);
  border-bottom-color: #ffffff33;
  border-radius: 8px;
  background: #00000022;
  color: #d1d5db;
}

.light-mode .kbd {
  background: #ffffff88;
  color: #475569;
  border-bottom-color: #0000001a;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--card);
  border: 1px solid var(--stroke);
  color: var(--text);
  padding: 10px 15px;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  transition: transform 0.1s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

/* 전환 애니메이션 */
.fade {
  animation: fadeIn 0.22s ease both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}