:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --border: #e3e5ea;
  --text: #1f2430;
  --text-muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

header h1 {
  font-size: 20px;
  font-weight: 700;
  margin: 0;
}

/* --- 카드 --- */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-header h2 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0;
}

/* --- 버튼 --- */

.btn {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  background: #f2f3f5;
}

.btn-danger {
  background: transparent;
  border-color: var(--border);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

/* --- 입력 폼 --- */

.field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin: 12px 0 6px;
}

input[type="text"],
input[type="password"],
input[type="number"],
input:not([type]) {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0 20px;
  max-width: 480px;
}

.toggle-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.toggle-list label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  background: #fafafa;
}

.toggle-list input {
  width: auto;
  margin: 0;
}

.card > .btn {
  margin-top: 16px;
}

.hint {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.error {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--danger);
  text-align: center;
}

/* --- 로그인 화면 --- */

.login-screen {
  min-height: 100vh;
  min-height: 100dvh; /* 모바일 브라우저 주소창 높이를 뺀 실제 보이는 높이 기준으로 중앙정렬 */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 340px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
}

.login-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  text-align: center;
}

.login-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  margin: 6px 0 20px;
}

/* --- 테이블 --- */

.table-wrap {
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13.5px;
}

th, td {
  padding: 10px 12px;
  text-align: left;
  white-space: nowrap;
}

thead th {
  background: #f9fafb;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--border);
}

thead th[data-sort] {
  cursor: pointer;
  user-select: none;
}

thead th[data-sort]:hover {
  color: var(--text);
}

tbody tr {
  border-bottom: 1px solid var(--border);
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: #f9fafb;
}

/* --- 상태 뱃지 / 진행률 --- */

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.badge-normal {
  background: var(--success-bg);
  color: var(--success);
}

.badge-disconnected {
  background: var(--danger-bg);
  color: var(--danger);
}

.progress-track {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 90px;
}

.progress-bar {
  position: relative;
  width: 60px;
  height: 6px;
  background: #eceef1;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar > span {
  position: absolute;
  inset: 0;
  background: var(--primary);
  border-radius: 999px;
}

/* --- 모바일 --- */

@media (max-width: 640px) {
  .container {
    padding: 16px 12px 40px;
  }

  header h1 {
    font-size: 17px;
  }

  .card {
    padding: 16px;
    border-radius: 8px;
  }

  .card-header h2 {
    font-size: 12px;
  }

  /* 터치 탭 영역 확보 */
  .btn {
    padding: 11px 16px;
  }

  input[type="text"],
  input[type="password"],
  input[type="number"],
  input:not([type]) {
    padding: 11px 12px;
    font-size: 16px; /* iOS에서 16px 미만이면 입력 시 자동 확대(줌)됨 */
  }

  table {
    font-size: 12.5px;
  }

  th, td {
    padding: 8px 10px;
  }

  .login-card {
    padding: 24px 20px;
  }
}