header h1 {
  font-size: 1.5rem;
}

:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --primary: #0b5ed7;
  --muted: #6b7280;
  --text: #111827;
  --radius: 10px;
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.07);
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

header {
  background: transparent;
  padding: 2rem 1rem 0;
  text-align: center;
}
header h1 {
  margin: 0;
  font-size: 1.6rem;
}

.navbar {
  margin-top: 1rem;
  border-bottom: 2px solid rgba(15, 23, 42, 0.06);
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
}
.nav-link {
  display: inline-block;
  padding: 0.75rem 1.2rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-bottom: 3px solid transparent;
  transition: all 0.2s ease;
}
.nav-link:hover {
  color: var(--primary);
  border-bottom-color: rgba(11, 94, 215, 0.2);
}
.nav-link.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

main {
  padding: 1rem 0 3rem;
}

.contact-container {
  max-width: 840px;
  margin: 0 auto;
  padding: 1rem;
}
.contact-form {
  background: var(--card);
  padding: 1.25rem 1.25rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(15, 23, 42, 0.03);
}

.form-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}
.form-row label {
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text);
}

input[type="text"],
input[type="email"],
input[type="datetime-local"],
textarea {
  padding: 0.7rem 0.85rem;
  border: 1px solid #e6e9ef;
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: var(--text);
}
input::placeholder,
textarea::placeholder {
  color: #9aa3b2;
}
textarea {
  min-height: 110px;
}
input:focus,
textarea:focus {
  outline: none;
  box-shadow: 0 6px 20px rgba(11, 94, 215, 0.08);
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin-top: 0.25rem;
}
.btn {
  background: var(--primary);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(11, 94, 215, 0.12);
}
.btn:active {
  transform: translateY(0);
}
.btn--muted {
  background: #f3f4f6;
  color: var(--text);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.date-preview {
  margin-top: 0.5rem;
  display: inline-block;
  vertical-align: middle;
  margin-top: 0.5rem;
}
.date-card {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: linear-gradient(180deg, #fff, #fbfdff);
  padding: 0.6rem 0.75rem;
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 42, 0.03);
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.03);
}
.date-card svg {
  flex: 0 0 34px;
  height: 34px;
  width: 34px;
}
.date-text {
  display: flex;
  flex-direction: column;
}
.date-main {
  font-weight: 700;
  color: var(--text);
  font-size: 0.98rem;
}
.date-sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 3px;
}
.muted {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.35rem;
}

/* Spinner en botón */
.btn.sending {
  position: relative;
  opacity: 0.96;
}
.btn.sending::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: translateY(-50%) rotate(360deg);
  }
}