:root {
  color-scheme: light;
  --bg: #f4f7f6;
  --panel: #ffffff;
  --text: #1d2523;
  --muted: #5f6f6a;
  --line: #dce5e2;
  --primary: #1f8a5b;
  --primary-hover: #176b47;
  --danger: #b42318;
  --danger-hover: #8f1b13;
  --warning: #b7791f;
  --shadow: 0 18px 50px rgba(20, 40, 34, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(31, 138, 91, 0.14), transparent 42%),
    var(--bg);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(100%, 460px);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: var(--primary);
  font-size: 24px;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
}

p {
  margin: 4px 0 0;
  color: var(--muted);
}

.auth-form {
  display: grid;
  gap: 10px;
}

label {
  font-size: 14px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  background: #ffffff;
  font-size: 16px;
}

input:focus {
  outline: 3px solid rgba(31, 138, 91, 0.18);
  border-color: var(--primary);
}

button {
  min-height: 44px;
  margin-top: 8px;
  border: 0;
  border-radius: 6px;
  color: #ffffff;
  background: var(--primary);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.65;
  cursor: wait;
}

.secondary-button {
  width: 100%;
  background: var(--danger);
}

.secondary-button:hover {
  background: var(--danger-hover);
}

#test-message-button {
  width: 100%;
  margin-top: 10px;
}

.feedback {
  min-height: 22px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
}

.feedback.error {
  color: var(--danger);
}

.session-panel {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.status-line {
  display: grid;
  grid-template-columns: 12px 1fr;
  align-items: center;
  gap: 12px;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--warning);
}

.status-dot.connected {
  background: var(--primary);
}

.status-dot.disconnected,
.status-dot.error {
  background: var(--danger);
}

#session-status {
  display: block;
}

#session-phone {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
}

.qr-panel {
  display: grid;
  place-items: center;
  margin: 18px 0 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f9fbfa;
}

.qr-panel img {
  width: min(100%, 280px);
  height: auto;
  image-rendering: crisp-edges;
}

@media (max-width: 480px) {
  .app-shell {
    padding: 14px;
  }

  .panel {
    padding: 20px;
  }
}