:root {
  color-scheme: light;
  --bg: #f3f5f7;
  --card: #ffffff;
  --ink: #142033;
  --muted: #5b677a;
  --line: #d7dde7;
  --accent: #0f6a5c;
  --accent-ink: #ffffff;
  --danger: #9b1c1c;
  --ok: #0b6b3a;
  --shadow: 0 18px 40px rgba(20, 32, 51, 0.08);
  --radius: 16px;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(15, 106, 92, 0.12), transparent 36%),
    linear-gradient(180deg, #eef2f6 0%, var(--bg) 100%);
  color: var(--ink);
}

.wrap {
  width: min(480px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0 3rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.sub {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

label {
  display: block;
  margin: 0 0 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
  font: inherit;
  color: var(--ink);
  background: #fbfcfd;
  margin-bottom: 1rem;
}

input:focus,
textarea:focus {
  outline: 2px solid rgba(15, 106, 92, 0.28);
  border-color: var(--accent);
}

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

.row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

button,
.btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-weight: 600;
  padding: 0.85rem 1.2rem;
  cursor: pointer;
}

button.secondary,
.btn.secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
}

.msg {
  margin: 0 0 1rem;
  padding: 0.8rem 0.95rem;
  border-radius: 12px;
  font-size: 0.92rem;
}

.msg.error {
  background: #fdecec;
  color: var(--danger);
}

.msg.ok {
  background: #e8f7ee;
  color: var(--ok);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.hint {
  margin-top: -0.4rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.82rem;
}