:root {
  --ink: #14211a;
  --muted: #526057;
  --paper: #f7f0df;
  --paper-strong: rgba(255, 252, 245, 0.72);
  --leaf: #1d6643;
  --leaf-dark: #10261c;
  --line: rgba(20, 33, 26, 0.14);
  --glow: rgba(217, 247, 167, 0.62);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  background:
    radial-gradient(circle at top left, var(--glow), transparent 24%),
    radial-gradient(circle at 85% 20%, rgba(29, 102, 67, 0.22), transparent 20%),
    linear-gradient(145deg, #f7f0df 0%, #dce7d0 48%, #b8d4c2 100%);
  min-height: 100vh;
}

.shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 72px;
}

.hero,
.panel {
  border-bottom: 1px solid var(--line);
}

.hero {
  min-height: 78vh;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: center;
  padding: 28px 0 56px;
}

.hero-copy {
  animation: rise 0.7s ease;
}

.hero-side {
  display: grid;
  gap: 12px;
  animation: rise 0.9s ease;
}

.hero-card,
.panel-card,
article,
.summary-box,
.status-strip,
#preview-frame {
  background: var(--paper-strong);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  box-shadow: 0 12px 44px rgba(16, 38, 28, 0.08);
}

.hero-card,
article {
  padding: 18px;
  border-radius: 22px;
}

.hero-card span,
article span,
.muted,
.label {
  color: var(--muted);
}

.hero-card strong,
article strong {
  display: block;
  margin-top: 12px;
  font-size: 1.15rem;
}

.eyebrow {
  font: 700 12px/1 "Courier New", monospace;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--leaf);
}

h1 {
  font-size: clamp(3.8rem, 10vw, 8.6rem);
  line-height: 0.88;
  letter-spacing: -0.08em;
  margin: 10px 0 18px;
  max-width: 820px;
}

h2 {
  font-size: clamp(2.3rem, 5vw, 4.2rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
  margin: 8px 0 22px;
}

h3 {
  margin: 0;
  font-size: 1.2rem;
}

.lead {
  font-size: clamp(1.08rem, 2.1vw, 1.45rem);
  line-height: 1.55;
  max-width: 760px;
  color: var(--muted);
}

.panel {
  padding: 52px 0;
}

.grid,
.builder-grid,
.workspace-grid {
  display: grid;
  gap: 16px;
}

.grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

article {
  min-height: 160px;
}

.builder-top,
.card-header,
.file-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
}

.builder-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.65fr);
  margin-top: 20px;
}

.workspace-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.75fr);
  margin-top: 16px;
}

.panel-card {
  border-radius: 24px;
  padding: 20px;
}

.input-card,
.result-card,
.preview-card {
  animation: rise 0.8s ease;
}

.label {
  display: block;
  margin: 12px 0 8px;
  font: 700 12px/1 "Courier New", monospace;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.54);
  border-radius: 18px;
  color: var(--ink);
}

textarea {
  padding: 18px;
  font: 1rem/1.55 "Courier New", monospace;
  resize: vertical;
}

select {
  padding: 14px 16px;
  font: 1rem/1.4 Georgia, serif;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.actions.tight {
  margin-top: 0;
}

.button {
  appearance: none;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  border-radius: 999px;
  padding: 12px 18px;
  font: 700 13px/1 "Courier New", monospace;
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--leaf-dark);
  color: var(--paper);
  border-color: var(--leaf-dark);
}

.button.small {
  padding: 10px 14px;
  font-size: 12px;
}

.status-strip,
.summary-box {
  border-radius: 18px;
  padding: 14px 16px;
  white-space: pre-wrap;
}

.summary-box {
  margin-top: 18px;
  min-height: 132px;
  font: 0.96rem/1.55 "Courier New", monospace;
}

.workspace-main {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 14px;
}

.file-list,
.history-list {
  display: grid;
  gap: 10px;
}

.file-item,
.history-item {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.52);
  color: var(--ink);
  border-radius: 16px;
  padding: 12px 14px;
  cursor: pointer;
}

.file-item.active {
  background: var(--leaf-dark);
  border-color: var(--leaf-dark);
  color: var(--paper);
}

.history-item strong,
.history-item span,
.history-item p {
  display: block;
}

.history-item span,
.history-item p {
  margin-top: 8px;
  color: var(--muted);
}

.file-viewer {
  min-width: 0;
}

.output {
  margin: 10px 0 0;
  min-height: 440px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(16, 38, 28, 0.96);
  color: #f7f0df;
  padding: 18px;
  overflow: auto;
  white-space: pre-wrap;
  font: 0.93rem/1.5 "Courier New", monospace;
}

#preview-frame {
  width: 100%;
  min-height: 720px;
  border-radius: 20px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero,
  .builder-grid,
  .workspace-grid,
  .grid,
  .workspace-main {
    grid-template-columns: 1fr;
  }

  .builder-top,
  .card-header,
  .file-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  #preview-frame {
    min-height: 520px;
  }
}