:root {
  color-scheme: light;
  --page: #f4f6f4;
  --panel: #ffffff;
  --ink: #17211c;
  --muted: #647067;
  --line: #d9e0dc;
  --accent: #146c43;
  --accent-hover: #0f5a37;
  --warning: #815d13;
  --danger: #a6372d;
  --focus: #2f80ed;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
}

.shell {
  width: min(100%, 760px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 48px 20px;
  display: flex;
  align-items: center;
}

.panel {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 32px;
  box-shadow: 0 18px 50px rgba(23, 33, 28, 0.08);
}

.heading {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: 0;
}

.timezone {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.form {
  display: grid;
  gap: 18px;
}

.hidden {
  display: none;
}

.time-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  color: var(--ink);
  font: inherit;
}

input:focus {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(47, 128, 237, 0.18);
  outline: none;
}

button {
  min-height: 48px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

button.secondary {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

button.secondary:hover {
  background: #f7f8f7;
}

.status {
  min-height: 22px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

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

.status.warning {
  color: var(--warning);
}

.status.success {
  color: var(--accent);
}

@media (max-width: 640px) {
  .shell {
    padding: 20px 14px;
    align-items: stretch;
  }

  .panel {
    padding: 24px 18px;
  }

  h1 {
    font-size: 1.55rem;
  }

  .time-grid {
    grid-template-columns: 1fr;
  }
}