/* Light theme only (users are non-technical; dark mode was ruled out). */
:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #d9dde3;
  --text: #1d2228;
  --muted: #6b7380;
  --primary: #2a6edc;
  --primary-text: #ffffff;
  --green: #168c46;
  --red: #c82828;
  --success-bg: #e8f6ec;
  --radius: 12px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
[hidden] { display: none !important; }
h1 { font-size: 28px; margin: 0 0 20px; text-align: center; }
h2 { font-size: 18px; margin: 0 0 12px; }
.muted { color: var(--muted); }
.error { color: var(--red); min-height: 1.5em; margin: 10px 0 0; text-align: center; }

button {
  font: inherit;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #eef0f3;
  color: var(--text);
  cursor: pointer;
}
button:hover { background: #e3e6ea; }
button.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }
button.primary:hover { filter: brightness(1.05); }
button.big { padding: 10px 18px; font-size: 16px; width: 100%; }
button:disabled { opacity: .6; cursor: default; }

input {
  font: inherit;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #aab1bb;
  border-radius: 8px;
  background: #fff;
  color: var(--text);
}
input:focus { outline: 2px solid var(--primary); outline-offset: 0; border-color: var(--primary); }
label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 14px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.card.success { background: var(--success-bg); border: 2px solid var(--green); margin-top: 14px; }
.card.success h2 { color: var(--green); }

/* Login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 380px; display: flex; flex-direction: column; gap: 14px; }

/* Top bar */
.topbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px;
  padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--border);
}
.brand { font-size: 19px; font-weight: 700; }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.tabs button { padding: 7px 16px; }
.tabs button[aria-current="page"] { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }
.session { margin-left: auto; display: flex; align-items: center; gap: 8px; }

.content { padding: 18px 20px 40px; max-width: 1100px; }

/* Overview cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.stat .label { color: var(--muted); font-size: 14px; }
.stat .value { font-size: 30px; font-weight: 700; }
.stat .unit { font-size: 15px; margin-left: 4px; font-weight: 400; }

/* Forms */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 14px; }
.inline { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px; }
.inline label { flex: 1 1 220px; max-width: 320px; }
.list-title { margin-top: 24px; }

/* Tables: scroll inside their own box, never the page */
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; min-width: 560px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid #eceef1; white-space: nowrap; }
th { font-weight: 600; background: #fafbfc; }
tbody tr:last-child td { border-bottom: none; }
td.empty { color: var(--muted); text-align: center; padding: 22px; white-space: normal; }
.dot-on { color: var(--green); font-weight: 600; }
.dot-off { color: var(--red); font-weight: 600; }
.dot-disabled { color: var(--muted); }

.token { display: block; word-break: break-all; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 10px; margin: 8px 0 12px; font-size: 14px; }

.toast {
  position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%);
  max-width: calc(100% - 32px); padding: 10px 18px; border-radius: 10px;
  background: #1d2228; color: #fff; box-shadow: 0 4px 16px rgba(0,0,0,.18);
}
.toast.error { background: var(--red); }

@media (max-width: 640px) {
  .topbar { padding: 10px 16px; }
  .content { padding: 14px 16px 32px; }
  .session { margin-left: 0; width: 100%; }
  .stat .value { font-size: 26px; }
}