:root {
  color-scheme: light;
  font-family: "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #17202a;
  --muted: #5d6c79;
  --line: #d7e0e7;
  --accent: #176c9d;
  --accent-strong: #0f5f8f;
  --soft: #eef7fc;
}

* {
  box-sizing: border-box;
}

body.image-text-add {
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  margin: 0;
}

a {
  color: var(--accent-strong);
}

button,
input,
textarea {
  font: inherit;
}

button {
  align-items: center;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 7px;
  color: #fff;
  cursor: pointer;
  display: inline-flex;
  justify-content: center;
  min-height: 2.55rem;
  min-width: 0;
  padding: .55rem .8rem;
}

button.secondary {
  background: #f8fafc;
  border-color: var(--line);
  color: var(--ink);
}

input,
textarea {
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  min-width: 0;
  padding: .55rem .65rem;
  width: 100%;
}

input[type="color"] {
  min-height: 2.5rem;
  padding: .2rem;
}

input[type="checkbox"] {
  width: auto;
}

input[type="range"] {
  padding: 0;
}

label {
  color: var(--muted);
  display: grid;
  gap: .3rem;
  font-size: .92rem;
}

h1,
h2,
h3,
p,
li,
a {
  overflow-wrap: anywhere;
}

.ita-shell {
  margin: 0 auto;
  max-width: 1180px;
  padding: 1rem;
}

.ita-hero,
.ita-panel,
.ita-card,
.ita-comments,
.ita-related,
.ita-return a {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.ita-hero {
  margin: 1rem 0;
  padding: 1.2rem;
}

.ita-kicker {
  color: var(--accent-strong);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  margin: 0 0 .3rem;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.9rem);
  line-height: 1.18;
  margin: 0 0 .75rem;
}

h2 {
  font-size: 1.28rem;
  line-height: 1.35;
  margin: 0 0 .8rem;
}

.ita-lead,
.ita-note,
.ita-status {
  color: var(--muted);
}

.ita-workspace {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 360px);
}

.ita-panel,
.ita-card,
.ita-comments,
.ita-related {
  min-width: 0;
  padding: 1rem;
}

.ita-canvas-wrap {
  align-items: center;
  background:
    linear-gradient(45deg, #dce4eb 25%, transparent 25%),
    linear-gradient(-45deg, #dce4eb 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #dce4eb 75%),
    linear-gradient(-45deg, transparent 75%, #dce4eb 75%);
  background-color: #f9fbfd;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  justify-content: center;
  min-height: 320px;
  overflow: hidden;
  padding: .75rem;
  touch-action: none;
  user-select: none;
}

#imageTextCanvas {
  background: #fff;
  box-shadow: 0 14px 34px rgba(15, 23, 42, .16);
  display: block;
  height: auto;
  max-height: 72vh;
  max-width: 100%;
}

.ita-controls {
  display: grid;
  gap: .75rem;
}

.ita-control-group {
  background: #fbfdff;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: .65rem;
  padding: .85rem;
}

.ita-two {
  display: grid;
  gap: .55rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ita-check {
  align-items: center;
  color: var(--ink);
  display: flex;
  gap: .45rem;
}

.ita-actions,
.ita-link-grid,
.ita-return {
  display: grid;
  gap: .65rem;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.ita-link-grid a,
.ita-return a {
  background: var(--soft);
  color: var(--ink);
  display: block;
  padding: .75rem;
  text-decoration: none;
}

.ita-link-grid strong,
.ita-link-grid span,
.ita-return strong,
.ita-return span,
.ita-return small {
  display: block;
}

.ita-link-grid span,
.ita-return span,
.ita-return small {
  color: var(--muted);
  font-size: .9rem;
}

.ita-card + .ita-card,
.ita-related,
.ita-comments,
.ita-return {
  margin-top: 1rem;
}

.ad-row {
  margin: 1rem 0;
  min-height: 250px;
}

.ad-label {
  color: var(--muted);
  font-size: .75rem;
  text-align: center;
}

.ita-footer {
  color: var(--muted);
  font-size: .85rem;
  padding: 1rem 0 2rem;
  text-align: center;
}

@media (max-width: 920px) {
  .ita-workspace {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .ita-shell {
    padding: .75rem;
  }

  .ita-hero,
  .ita-panel,
  .ita-card,
  .ita-comments,
  .ita-related {
    padding: .85rem;
  }

  .ita-two {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }

  .ita-canvas-wrap {
    min-height: 220px;
    padding: .35rem;
  }
}