:root {
  --bg: #f4f0e8;
  --panel: #fffaf1;
  --text: #1d1b18;
  --muted: #6f685e;
  --line: #ded3c2;
  --accent: #2f5d50;
  --accent-2: #a45b35;
  --soft: #ebe2d2;
  --shadow: 0 18px 60px rgba(52, 43, 31, 0.12);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  color: var(--text);
  background: linear-gradient(180deg, #f8f4ec 0%, var(--bg) 100%);
  font-family: "IBM Plex Sans", sans-serif;
}

.write-shell {
  width: min(1240px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.write-header {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: start;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.back-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2 { margin: 0; }
h1 {
  max-width: 820px;
  font-family: "Noto Serif SC", serif;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

h2 { font-size: 1.25rem; }
.header-copy, .muted {
  max-width: 760px;
  color: var(--muted);
  line-height: 1.8;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 1rem;
  margin-top: 1rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.form-panel, .output-panel, .mechanism-panel { padding: 1.25rem; }
.section-head { margin-bottom: 1rem; }
.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.field {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.9rem;
}
.field span { color: var(--muted); font-weight: 700; }
.field b { color: var(--accent-2); }
.field-wide { grid-column: 1 / -1; }

input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 0.9rem;
  background: #fffdf8;
  color: var(--text);
  font: inherit;
  outline: none;
}

textarea { resize: vertical; line-height: 1.7; }
input:focus, select:focus, textarea:focus {
  border-color: rgba(47, 93, 80, 0.6);
  box-shadow: 0 0 0 4px rgba(47, 93, 80, 0.1);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 0.5rem;
}
button {
  border: 0;
  border-radius: 999px;
  padding: 0.85rem 1.2rem;
  background: var(--accent);
  color: #fffaf1;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
button.secondary {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
}

.side-stack { display: grid; gap: 1rem; align-content: start; }
pre {
  overflow: auto;
  min-height: 18rem;
  margin: 1rem 0 0;
  padding: 1rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #191714;
  color: #f7ead8;
  line-height: 1.65;
  white-space: pre-wrap;
}

.mechanism-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding-left: 1.2rem;
}
.mechanism-list li { padding-left: 0.25rem; }
.mechanism-list b { display: block; color: var(--accent); }
.mechanism-list span { display: block; color: var(--muted); line-height: 1.65; }

@media (max-width: 900px) {
  .layout, .write-header { grid-template-columns: 1fr; }
  .field-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .write-shell { width: min(100% - 1rem, 100%); padding-top: 1rem; }
  .form-panel, .output-panel, .mechanism-panel { padding: 1rem; }
}