* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  /* 글꼴 */
  --font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Noto Sans KR", sans-serif;

  /* 배경 */
  --bg-primary: #f4f6f8;
  --bg-card: #ffffff;
  --bg-plate: #f8f9fa;

  /* 텍스트 */
  --text-primary: #17212b;
  --text-secondary: #747c86;
  --text-action: #ffffff;

  /* 버튼 */
  --bg-action: #17212b;
  --bg-action-hover: #243342;
  --bg-action-active: #101820;

  /* 테두리와 포커스 */
  --border-subtle: #e4e8ec;
  --accent-blue: #2f80ed;

  /* 그림자 */
  --shadow-card:
    0 14px 36px rgba(23, 33, 43, 0.1),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
  --shadow-plate: inset 0 1px 2px rgba(23, 33, 43, 0.08);
  --shadow-button: 0 6px 18px rgba(23, 33, 43, 0.18);
  --shadow-button-hover: 0 10px 24px rgba(23, 33, 43, 0.22);
  --shadow-button-active: 0 2px 8px rgba(23, 33, 43, 0.18);

  /* 배경 효과 */
  --glow-primary:
    radial-gradient(
      circle at 30% 20%,
      rgba(47, 128, 237, 0.1) 0%,
      transparent 40%
    ),
    radial-gradient(
      circle at 70% 80%,
      rgba(47, 128, 237, 0.05) 0%,
      transparent 40%
    );

  /* 타이포그래피 */
  --display-size: 38px;
  --heading-size: 20px;
  --body-size: 16px;
  --caption-size: 13px;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  overflow: hidden;
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--bg-primary);
}

body::before {
  position: absolute;
  top: -50%;
  left: -50%;
  z-index: 0;
  width: 200%;
  height: 200%;
  content: "";
  background: var(--glow-primary);
  pointer-events: none;
}

.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 380px;
  animation: fade-in-up 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.card {
  padding: 32px 28px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  box-shadow: var(--shadow-card);
}

.plate {
  position: relative;
  padding: 24px 16px;
  margin-bottom: 32px;
  text-align: center;
  background: var(--bg-plate);
  border-radius: 12px;
  box-shadow: var(--shadow-plate);
}

.plate-number {
  font-family: var(--font-family);
  font-size: var(--display-size);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1, "lnum" 1;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.message {
  margin-bottom: 20px;
  text-align: center;
}

.message-title {
  font-size: var(--heading-size);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.3px;
}

.call-button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 18px 24px;
  gap: 10px;
  font-family: inherit;
  font-size: var(--body-size);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-action);
  text-decoration: none;
  letter-spacing: 0;
  cursor: pointer;
  user-select: none;
  background: var(--bg-action);
  border: 0;
  border-radius: 100px;
  box-shadow: var(--shadow-button);
  transition:
    transform 100ms ease-out,
    background 100ms ease-out,
    box-shadow 100ms ease-out;
  touch-action: manipulation;
  -webkit-touch-callout: none;
}

.call-button svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.call-button:active {
  background: var(--bg-action-active);
  box-shadow: var(--shadow-button-active);
  transform: scale(0.98);
}

.call-button:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.footer {
  margin-top: 24px;
  font-size: var(--caption-size);
  font-weight: 400;
  line-height: 1.4;
  color: var(--text-secondary);
  text-align: center;
  letter-spacing: 0.5px;
}

@media (hover: hover) and (pointer: fine) {
  .call-button:hover {
    background: var(--bg-action-hover);
    box-shadow: var(--shadow-button-hover);
    transform: translateY(-2px);
  }
}

@media (max-width: 380px) {
  :root {
    --display-size: 32px;
  }

  .card {
    padding: 32px 20px 24px;
  }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .container {
    animation: none;
  }

  .call-button {
    transition: none;
  }
}