:root {
  /* ===== 폰트 사이즈 스케일 (영역별 오프셋) ===== */
  --scale-keypad: 1.5;
  --scale-date: 1.6;
  --scale-id: 2.2;

  /* 기본 폰트 사이즈 */
  --fs-date-base: clamp(12px, 0.9vw, 18px);
  --fs-time-base: clamp(20px, 1.8vw, 34px);
  --fs-id-value-base: clamp(14px, 1.6vw, 28px);
  --fs-id-placeholder-base: clamp(14px, 1.2vw, 20px);
  --fs-keypad-base: clamp(18px, 1.8vw, 28px);
  --fs-keypad-label-base: clamp(10px, 0.9vw, 14px);
  --fs-submit-base: clamp(14px, 1.0vw, 18px);
  --fs-logo-sub-base: clamp(10px, 0.8vw, 14px);

  /* 스케일 적용 */
  --fs-date: calc(var(--fs-date-base) * var(--scale-date));
  --fs-time: calc(var(--fs-time-base) * var(--scale-date));
  --fs-id-value: calc(var(--fs-id-value-base) * var(--scale-id));
  --fs-id-placeholder: calc(var(--fs-id-placeholder-base) * var(--scale-id));
  --fs-keypad: calc(var(--fs-keypad-base) * var(--scale-keypad));
  --fs-keypad-label: var(--fs-keypad-label-base);
  --fs-submit: var(--fs-submit-base);
  --fs-logo-sub: var(--fs-logo-sub-base);

  /* ===== 키패드 사이즈 ===== */
  --key-size: clamp(84px, 9vw, 180px);
  --key-gap: clamp(12px, 1.4vw, 32px);
  --keypad-pad-x: clamp(24px, 2.4vw, 48px);

  /* ===== 색상 ===== */
  --bg: #e5e7eb;
  --frame-bg: #f9fafb;
  --card-bg: #ffffff;
  --border: #d1d5db;
  --border-strong: #9ca3af;
  --muted: #6b7280;
  --text: #111827;
  --accent: #2563eb;
  --accent-soft: #3b82f6;
  --danger: #b91c1c;

  --shadow-frame: 0 18px 45px rgba(15, 23, 42, 0.15);
  --shadow-soft: 0 10px 25px rgba(15, 23, 42, 0.06);

  --radius-lg: 24px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: radial-gradient(circle at top, #f3f4f6, var(--bg) 60%);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Noto Sans KR", sans-serif;
  color: var(--text);
}

/* 16:9 고정 프레임 */
.kiosk-shell {
  width: min(100vw, calc(100vh * (16 / 9)));
  aspect-ratio: 16 / 9;
  padding: 24px;
}

.kiosk-frame {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #f9fafb, #eef2ff);
  box-shadow: var(--shadow-frame);
  padding: 24px;
  display: flex;
  gap: 30px;
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.left-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-left: 1.5vw;
  padding-right: 1vw;
}

.right-panel {
  flex: 0 0 auto;
  display: flex;
  justify-content: flex-end;
}

/* 로고 영역 */
.logo-area {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.logo-wrap {
  width: 12vmin;
  height: 12vmin;
  max-width: 120px;
  max-height: 120px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  box-shadow: var(--shadow-soft);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.logo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.logo-placeholder {
  font-size: 0.8vw;
  color: var(--muted);
}

.logo-texts {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.logo-main {
  font-size: 2.2vw;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.logo-sub {
  font-size: calc(var(--fs-logo-sub) * 1.5);
  color: var(--muted);
  margin-top: 0px;
}

/* 시계 */
.clock-area {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.clock-date {
  font-size: var(--fs-date);
  color: var(--muted);
  margin-bottom: 2px;
}

.clock-time {
  font-size: calc(var(--fs-time) * 1.6);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
}

/* 아이디 입력부 */
.id-display-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
}

.id-field {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.id-label {
  font-size: 1.6vw;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.id-input-row {
  display: flex;
  align-items: flex-end;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-strong);
}

.id-value {
  flex: 1;
  min-height: 3.4vmin;
  font-size: var(--fs-id-value);
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.id-value.placeholder {
  font-size: var(--fs-id-placeholder);
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 등록 버튼 */
.submit-area {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
}

.primary-btn {
  min-width: 140px;
  padding: 10px 26px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, 0.35);
  font-size: var(--fs-submit);
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #f9fafb;

  /* 네온 → 은은한 그림자 */
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);

  transition:
    transform 0.12s ease-out,
    box-shadow 0.12s ease-out,
    filter 0.12s ease-out;
}

.primary-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.03);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.28);
}

.primary-btn:active {
  transform: translateY(0);
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.20);
}


/* 키패드 */
.keypad-card {
  flex: 1;
  border-radius: var(--radius-md);
  background: var(--card-bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  padding: 16px var(--keypad-pad-x);
  display: flex;
  flex-direction: column;
  gap: 12px;

  width: calc(
    var(--key-size) * 3 +
    var(--key-gap) * 2 +
    var(--keypad-pad-x) * 2
  );
  max-width: 100%;
}

.keypad-title {
  font-size: var(--fs-keypad-label);
  font-weight: 500;
  color: var(--muted);
  text-align: right;
}

.keypad-grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(3, var(--key-size));
  grid-auto-rows: var(--key-size);
  justify-content: center;
  gap: var(--key-gap);
}

.key-btn {
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #f9fafb;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-keypad);
  font-weight: 600;
  cursor: pointer;
  width: var(--key-size);
  height: var(--key-size);

  box-shadow:
    0 5px 12px rgba(148, 163, 184, 0.35),
    0 0 0 1px rgba(148, 163, 184, 0.15);
  transition:
    transform 0.06s ease-out,
    box-shadow 0.06s ease-out,
    background 0.06s ease-out,
    filter 0.06s ease-out;
}

.key-btn:hover {
  filter: brightness(1.03);
  background: #ffffff;
}

.key-btn:active {
  transform: translateY(2px);
  box-shadow:
    0 2px 8px rgba(148, 163, 184, 0.5),
    0 0 0 1px rgba(148, 163, 184, 0.3);
}

.key-btn.key-clear {
  font-size: calc(var(--fs-keypad) * 0.6);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: #fef2f2;
  color: #b91c1c;
  border-color: rgba(185, 28, 28, 0.6);
  box-shadow:
    0 5px 12px rgba(254, 202, 202, 0.8),
    0 0 0 1px rgba(185, 28, 28, 0.4);
}

.key-btn.key-blank {
  visibility: hidden;
  pointer-events: none;
}

/* 작은 화면 보정 */
/*
@media (max-width: 768px) {
  .kiosk-shell {
    padding: 8px;
  }
  .kiosk-frame {
    padding: 16px;
    gap: 16px;
  }
  .logo-wrap {
    max-width: 56px;
    max-height: 56px;
  }
} */

/* 800×480 같은 낮은 해상도에서 키패드 축소 */
/* 800x480 전용 튜닝 */
@media (max-width: 900px) and (max-height: 520px) {
  :root {
    --key-size: clamp(60px, 17vh, 160px);
    --key-gap: 10px;
    --keypad-pad-x: 16px;
  }

  .kiosk-shell {
    padding: 8px;
  }
  .kiosk-frame {
    padding: 10px;
    gap: 16px;
  }
  .logo-wrap {
    max-width: 56px;
    max-height: 56px;
  }

  .kiosk-frame {
    padding-right: 16px;   /* 거의 프레임 끝까지 붙이기 */
    padding-left: 16px;
    gap: 12px;
  }

  .left-panel {
    flex: 1 1 auto;
    max-width: 58%;
    padding-left: 2vw;
    padding-right: 1vw;
  }

  .right-panel {
    flex: 00 0 auto;
    align-items: stretch;
  }

  .keypad-card {
    padding: 0px;
    height: 100%;
  }

  .keypad-grid {
    height: 100%;
    align-content: center;
    justify-content: center;
  }
}




/* ===== 출석 등록 결과 모달 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  display: none;                 /* 기본은 숨김 */
  align-items: center;
  justify-content: center;
  z-index: 1000;
  font-family: inherit;
}

.modal-overlay.active {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.35);
}

.modal-card {
  position: relative;
  z-index: 1001;
  width: min(360px, 90vw);
  padding: 20px 24px 18px;
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.25);
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.modal-message {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.modal-btn {
  min-width: 90px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition:
    background 0.12s ease-out,
    box-shadow 0.12s ease-out,
    transform 0.08s ease-out,
    color 0.12s ease-out;
}

.modal-btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-soft));
  color: #f9fafb;
  border-color: rgba(37, 99, 235, 0.5);

  /* 네온→부드러운 그림자 */
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.modal-btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.32);
}


.modal-btn.secondary {
  background: #f3f4f6;
  color: var(--muted);
  border-color: rgba(148, 163, 184, 0.7);
}

.modal-btn.secondary:hover {
  background: #e5e7eb;
}