:root {
  color-scheme: dark;
  font-family: "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, sans-serif;
  --bg-base: #0a0c11;
  --bg-surface: #141822;
  --bg-elevated: #1b202c;
  --text: #eaedf4;
  --text-muted: #98a1b5;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --accent: #5b8cff;
  --accent-hover: #7aa2ff;
  --accent-soft: rgba(91, 140, 255, 0.16);
  --gold: #d9b46a;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-base);
  background-image: radial-gradient(1200px 600px at 50% -12%, rgba(91, 140, 255, 0.10), transparent 62%);
  background-attachment: fixed;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.shell {
  max-width: 1140px;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 36px) clamp(16px, 4vw, 28px) 56px;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

h1::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin-top: 10px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(18px, 3vw, 26px);
  margin-bottom: 18px;
  box-shadow: var(--shadow-md);
}

label {
  display: block;
  margin: 12px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

input,
select {
  display: block;
  width: 100%;
  margin: 6px 0;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: inherit;
  box-sizing: border-box;
  font: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: auto;
  min-height: 42px;
  margin: 8px 0;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: linear-gradient(180deg, var(--accent), var(--accent-hover));
  color: #fff;
  cursor: pointer;
  box-sizing: border-box;
  font: inherit;
  font-weight: 600;
  transition: transform 0.12s ease, box-shadow 0.15s ease, background 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--accent-soft);
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.tabs button {
  width: auto;
  flex: 0 0 auto;
  margin: 0;
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  color: var(--text);
  font-weight: 550;
}

.tabs button:hover {
  border-color: var(--accent);
}

#logout {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text-muted);
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

td,
th {
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.actions {
  white-space: nowrap;
}

.actions button {
  display: inline-flex;
  width: auto;
  min-height: 34px;
  margin: 2px;
  padding: 6px 12px;
  font-size: 0.8rem;
}

.toolbar {
  margin-bottom: 12px;
}

.toolbar button {
  width: auto;
}

.inline-form {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 18px;
  background: var(--bg-elevated);
}

.inline-form h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.form-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.form-actions button {
  width: auto;
  flex: 1 1 140px;
}

#admin-msg {
  margin-bottom: 14px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  background: #17281f;
  border: 1px solid #2d6a4f;
}

#admin-msg.error {
  background: #2c1719;
  border-color: #6a2d2d;
  color: #f0b7b7;
}

.muted {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 4px 0 12px;
}

.device-list {
  margin-top: 12px;
}

.device-list h4 {
  margin: 12px 0 8px;
  font-size: 0.95rem;
}

.device-add-form {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.device-add-form button {
  width: auto;
  margin-top: 8px;
}

code {
  font-size: 0.8rem;
  word-break: break-all;
  color: var(--text-muted);
}

#login {
  max-width: 380px;
  margin: 8vh auto 0;
}

@media (max-width: 640px) {
  #content {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 560px;
  }

  .form-actions button {
    flex: 1 1 auto;
  }
}