:root {
  --teal-900: #103f3b;
  --teal-700: #0f766e;
  --teal-500: #14b8a6;
  --ink: #1a1f1e;
  --muted: #5b6965;
  --paper: #f4fbf9;
  --surface: #ffffff;
  --line: #d8ece6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, #d0f5ea 0, transparent 28%),
    radial-gradient(circle at 88% 8%, #b3e6dc 0, transparent 24%),
    linear-gradient(160deg, #f7fffc 0%, #edf9f5 55%, #e2f2ec 100%);
}

.app-shell {
  width: min(980px, calc(100% - 2rem));
  margin: 1.2rem auto 2rem;
  display: grid;
  gap: 1rem;
}

.hero {
  background: linear-gradient(135deg, var(--teal-900), var(--teal-700));
  color: white;
  border-radius: 18px;
  padding: 1.1rem 1.2rem 1rem;
  box-shadow: 0 12px 28px rgba(6, 28, 25, 0.18);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.subtitle {
  margin: 0.45rem 0 0;
  color: #d6f5ef;
  line-height: 1.5;
}

.badge {
  margin: 0 0 0.35rem;
  display: inline-block;
  border: 1px solid rgba(217, 251, 243, 0.55);
  border-radius: 999px;
  padding: 0.18rem 0.6rem;
  font-size: 0.8rem;
  color: #ddfff7;
}

.panel {
  background: color-mix(in srgb, var(--surface), white 10%);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: 0 6px 18px rgba(14, 53, 45, 0.08);
}

label {
  display: block;
  margin: 0 0 0.4rem;
  color: var(--muted);
  font-size: 0.93rem;
}

.row {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

input,
textarea,
button {
  font: inherit;
}

select {
  width: 100%;
  border: 1px solid #c5ddd7;
  background: #fafeff;
  border-radius: 10px;
  padding: 0.62rem 0.72rem;
  color: var(--ink);
  margin-bottom: 0.72rem;
}

input,
textarea {
  width: 100%;
  border: 1px solid #c5ddd7;
  background: #fafeff;
  border-radius: 10px;
  padding: 0.62rem 0.72rem;
  color: var(--ink);
}

.row input {
  flex: 1 1 320px;
}

textarea {
  resize: vertical;
}

.actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-top: 0.9rem;
}

.btn {
  border: 1px solid #9dcfbe;
  background: #e9f8f3;
  color: #184841;
  border-radius: 10px;
  padding: 0.56rem 0.95rem;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  background: #def5ee;
  box-shadow: 0 6px 14px rgba(8, 33, 29, 0.08);
}

.btn:active {
  transform: translateY(0);
}

.btn.primary {
  background: var(--teal-700);
  color: #ffffff;
  border-color: transparent;
}

.btn.primary:hover {
  background: #0e6a62;
}

.raw-html {
  margin-top: 0.95rem;
  border: 1px dashed #b8d8cf;
  border-radius: 12px;
  padding: 0.7rem;
  background: #f8fffd;
}

.raw-html summary {
  cursor: pointer;
  color: #2b5f57;
  margin-bottom: 0.7rem;
}

.status {
  margin: 0.9rem 0 0;
  min-height: 1.3rem;
  color: #265f56;
}

.status.error {
  color: #ad2b2b;
}

.hint {
  margin: 0.5rem 0 0;
  font-size: 0.84rem;
  color: #5e6f6b;
  line-height: 1.5;
}

.preview-panel h2 {
  margin: 0;
  font-size: 1.15rem;
}

.meta {
  margin: 0.6rem 0 0.85rem;
  color: #4e6963;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  font-size: 0.92rem;
}

.preview {
  border-top: 1px solid var(--line);
  padding-top: 0.9rem;
  line-height: 1.72;
  color: #252a29;
}

.preview img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0.75rem auto;
}

.preview table {
  width: 100%;
  border-collapse: collapse;
}

.preview th,
.preview td {
  border: 1px solid #dbe8e4;
  padding: 0.45rem 0.55rem;
}

@media (max-width: 680px) {
  .app-shell {
    width: min(980px, calc(100% - 1rem));
  }

  .panel {
    padding: 0.88rem;
  }
}