:root {
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --bg: #fff;
  --focus: #2563eb;
  --err: #b91c1c;
  --ok: #166534;
  --disabled: #94a3b8;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 2rem;
  background: #f8fafc;
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.5;
}

h1 {
  margin: 0 0 1.25rem;
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

form {
  max-width: 420px;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.06);
}

label {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.consent-field {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}

.consent-field label[for="consent"] {
  margin: 0;
}

#consent {
  width: auto;
  margin: 0.2rem 0 0;
  flex: 0 0 auto;
}

input,
button {
  font: inherit;
}

input[type="text"],
input[type="email"],
input[type="tel"] {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input::placeholder {
  color: #94a3b8;
}

input:focus {
  outline: none;
  border-color: var(--focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus) 22%, transparent);
}

.error {
  margin: 0.25rem 0 0.6rem 0.75rem;
  color: var(--err);
  font-size: 0.85rem;
}

input:invalid + .error {
  display: block;
}

button {
  width: 100%;
  margin-top: 0.8rem;
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 10px;
  background: var(--focus);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.05s ease;
}

button:hover {
  filter: brightness(0.95);
}

button:active {
  transform: translateY(1px);
}

button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--focus) 28%, transparent);
}

button:disabled {
  background: var(--disabled);
  cursor: not-allowed;
  filter: none;
  transform: none;
}

#sendingStatus {
  margin: 0.25rem 0 0 0.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

#serverError,
#verification-error {
  display: none;
}

form > * {
  margin-bottom: 0.65rem;
}

.otp-code-input {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  margin-bottom: 0.25rem;
}

.otp-code-group {
  width: 4.5rem;
  max-width: 4.5rem;
  padding: 0.7rem 0.25rem;
  text-align: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.2rem;
}

.otp-code-group.complete {
  border-color: #2e7d32;
  background: #f0fff4;
}

.otp-separator {
  user-select: none;
  color: var(--muted);
  font-size: 1.2rem;
  font-weight: 700;
}