*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black: #111111;
  --gray: #666666;
  --gray-light: #f5f5f5;
  --white: #ffffff;
  --border: #e0e0e0;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --whatsapp: #25d366;
}

html {
  font-size: 16px;
}

body {
  font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--white);
  color: var(--black);
  min-height: 100dvh;
  line-height: 1.5;
}

.admin-link {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  padding: 0.55rem 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  text-decoration: none;
  background: var(--black);
  border: 2px solid var(--black);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: background 0.2s, transform 0.15s;
}

.admin-link:hover {
  background: #333;
  border-color: #333;
}

.admin-link:active {
  transform: scale(0.97);
}

.page {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.screen {
  display: none;
  width: 100%;
  max-width: 440px;
  animation: fadeIn 0.35s ease;
}

.screen--active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.logo {
  width: min(280px, 85%);
  height: auto;
  margin: 0 auto 2rem;
  display: block;
}

.logo--small {
  width: min(200px, 70%);
  margin-bottom: 1.5rem;
}

.hero {
  margin-bottom: 2.5rem;
}

.hero__date {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 1rem;
}

.hero__title {
  font-size: clamp(1.6rem, 5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.25rem;
}

.hero__subtitle {
  font-size: clamp(1.2rem, 4vw, 1.5rem);
  font-weight: 400;
  color: var(--gray);
}

.form-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.form-subtitle {
  font-size: 0.9rem;
  color: var(--gray);
  margin-bottom: 1.75rem;
}

.form {
  text-align: left;
}

.field {
  margin-bottom: 1.1rem;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  color: var(--black);
}

.field input {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--white);
  color: var(--black);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input::placeholder {
  color: #aaa;
}

.field input:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 3px rgba(17, 17, 17, 0.08);
}

.field input:invalid:not(:placeholder-shown) {
  border-color: #c0392b;
}

.form-error {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: #c0392b;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  flex: 1;
  padding: 0.95rem 1.5rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 2px solid var(--black);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.15s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--black);
  color: var(--white);
}

.btn--primary:hover:not(:disabled) {
  background: #333;
  border-color: #333;
}

.btn--secondary {
  background: var(--white);
  color: var(--black);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--gray-light);
}

.btn--whatsapp {
  background: var(--whatsapp);
  border-color: var(--whatsapp);
  color: var(--white);
}

.btn--whatsapp:hover {
  background: #1ebe57;
  border-color: #1ebe57;
}

.btn--full {
  width: 100%;
}

@media (max-width: 380px) {
  .card {
    padding: 2rem 1.25rem;
  }

  .form-actions {
    flex-direction: column-reverse;
  }
}