:root {
  color-scheme: light;
  --bg: #f7f3ee;
  --bg-ink: #141a22;
  --bg-muted: #ece6df;
  --card: #fffdfb;
  --card-ink: #1f2a36;
  --accent: #0f4c5c;
  --accent-strong: #0b3641;
  --accent-soft: rgba(15, 76, 92, 0.12);
  --danger: #b3413b;
  --border: #ded6cc;
  --shadow: 0 24px 60px rgba(21, 29, 40, 0.15);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --space-xl: 40px;
  --space-lg: 28px;
  --space-md: 18px;
  --space-sm: 12px;
  --font-display: "Fraunces", "Source Serif 4", serif;
  --font-body: "Manrope", "IBM Plex Sans", sans-serif;
}

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

body {
  font-family: var(--font-body);
  color: var(--bg-ink);
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 55%, #efe7dd 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px 60px;
}

.public-shell {
  width: min(980px, 100%);
}

.public-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.public-card::after {
  content: "";
  position: absolute;
  inset: auto -80px -120px auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(15, 76, 92, 0.14), transparent 65%);
  pointer-events: none;
}

.header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 2.8rem);
  color: var(--accent-strong);
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

.header p {
  font-size: 1rem;
  color: #425160;
}

.form-group {
  margin-bottom: var(--space-md);
}

label {
  display: block;
  margin-bottom: 8px;
  color: #415262;
  font-weight: 600;
  letter-spacing: 0.2px;
}

input,
textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  font-family: var(--font-body);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.btn {
  background: var(--accent);
  color: #fff;
  padding: 14px 22px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  width: 100%;
  letter-spacing: 0.3px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(15, 76, 92, 0.2);
  background: var(--accent-strong);
}

.btn-secondary {
  background: #36414d;
}

.btn-secondary:hover {
  background: #26313b;
}

.btn-danger {
  background: var(--danger);
}

.btn-danger:hover {
  background: #8e302b;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  font-weight: 600;
  border: 1px solid transparent;
}

.alert-error {
  background: #fce8e2;
  color: #8e302b;
  border-color: #f1c1b7;
}

.alert-success {
  background: #e6f3ef;
  color: #145a44;
  border-color: #b6dfd1;
}

.message-url {
  background: #f6f2ee;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin: 18px 0;
  word-break: break-all;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  color: #36414d;
}

.copy-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 12px;
  margin-left: 10px;
}

.admin-link {
  text-align: center;
  margin-top: 20px;
}

.admin-link a {
  color: var(--accent);
  text-decoration: none;
  font-size: 14px;
}

.admin-link a:hover {
  text-decoration: underline;
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .public-card {
    padding: var(--space-lg);
  }
}