:root {
  --bg: #2D1B4E;
  --bg-soft: #3a2563;
  --bg-card: #221540;
  --accent: #FFD700;
  --accent-dim: #d6b300;
  --text: #ffffff;
  --text-dim: #c4b8de;
  --danger: #ff5d5d;
  --danger-bg: #4a1820;
  --ok: #5dd28b;
  --border: #4a3370;
  --radius: 12px;
  --fz: 16px;
  --max: 520px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: linear-gradient(180deg, var(--bg) 0%, #1c0f37 100%);
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: var(--fz);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 20px 24px;
  min-height: calc(100vh - 60px);
}

footer {
  text-align: center;
  padding: 16px;
  font-size: 13px;
  color: var(--text-dim);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.logo svg {
  width: 72px;
  height: 72px;
}

h1 {
  font-size: 28px;
  text-align: center;
  margin: 0 0 12px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 22px;
  margin: 0 0 8px;
  font-weight: 700;
}

p {
  margin: 0 0 12px;
  color: var(--text-dim);
}

p.lead {
  text-align: center;
  font-size: 18px;
  color: var(--text);
  margin: 0 0 8px;
  font-weight: 600;
}

p.sub {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 28px;
}

.btn {
  display: block;
  width: 100%;
  padding: 14px 18px;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  margin-bottom: 12px;
  transition: transform 0.05s, background 0.15s;
  font-family: inherit;
}

.btn-primary {
  background: var(--accent);
  color: #1a0f30;
}
.btn-primary:hover { background: var(--accent-dim); }
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-soft); }

.btn:disabled {
  opacity: 0.6;
  cursor: wait;
}

.warning {
  background: var(--danger-bg);
  border: 1.5px solid var(--danger);
  color: #ffd5d5;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-bottom: 20px;
  line-height: 1.4;
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--bg-card);
  padding: 4px;
  border-radius: var(--radius);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  flex: 1;
  padding: 10px 12px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
}
.tab.active {
  background: var(--accent);
  color: #1a0f30;
}

form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 4px;
  letter-spacing: 0.2px;
}

input[type="text"],
input[type="url"],
input[type="password"],
input[type="file"] {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

input:focus {
  border-color: var(--accent);
}

input[name="device_id"] {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.field-group {
  display: flex;
  flex-direction: column;
}

.optional {
  font-weight: 400;
  color: var(--text-dim);
  font-size: 12px;
}

.alert {
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  margin-top: 8px;
  font-weight: 500;
  line-height: 1.4;
  display: none;
}
.alert.show { display: block; }
.alert.ok {
  background: rgba(93, 210, 139, 0.15);
  border: 1.5px solid var(--ok);
  color: #b5edc7;
}
.alert.err {
  background: var(--danger-bg);
  border: 1.5px solid var(--danger);
  color: #ffd5d5;
}

.privacy-body {
  background: var(--bg-card);
  padding: 20px;
  border-radius: var(--radius);
  color: var(--text-dim);
  line-height: 1.6;
}

a, a:visited {
  color: var(--accent);
}

@media (max-width: 380px) {
  h1 { font-size: 24px; }
  main { padding: 24px 14px; }
}