:root {
  --paper: #fcfaf4;
  --paper-2: #f7f2ea;
  --blush: #f5dfdd;
  --beige: #efe4d4;
  --content-max: 1120px;
  --line: #867d75;
  --line-strong: #393633;
  --ink: #252320;
  --muted: #6d665f;
  --accent: #b21f2d;
  --accent-soft: #d97484;
  --accent-deep: #8b1723;
}

* { box-sizing: border-box; }

html {
  background: #f3eee6;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Avenir Next", "Hiragino Sans", "Yu Gothic", sans-serif;
  background:
    linear-gradient(90deg, rgba(245, 223, 221, 0.6) 0, rgba(245, 223, 221, 0.6) 26px, transparent 26px, transparent calc(100% - 26px), rgba(245, 223, 221, 0.6) calc(100% - 26px)),
    linear-gradient(180deg, #fffdfa 0%, #f7f2ea 100%);
  min-height: 100vh;
  padding: 0 0 18px;
}

.app {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.panel {
  border: 1px solid var(--line);
  background: rgba(255, 252, 247, 0.98);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.78) inset;
}

.hero,
.campaign,
.sequence {
  margin-inline: calc(50% - 50vw);
  padding-left: max(16px, calc((100vw - var(--content-max)) / 2 + 20px));
  padding-right: max(16px, calc((100vw - var(--content-max)) / 2 + 20px));
}

.hero {
  padding-top: clamp(16px, 1.7vw, 22px);
  padding-bottom: clamp(16px, 1.7vw, 22px);
  display: flex;
  gap: 18px;
  justify-content: space-between;
  align-items: flex-start;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 251, 246, 0.95)),
    linear-gradient(90deg, var(--paper) 0, var(--paper) 68%, var(--blush) 68%, var(--blush) 100%);
}

.hero-main h1,
.campaign h2 {
  margin: 0;
  font-family: "Iowan Old Style", "Baskerville", "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 0.95;
}

.hero-main h1 {
  font-size: clamp(28px, 4.1vw, 52px);
  color: var(--accent);
  max-width: 10.2em;
}

.hero-copy {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line-strong);
  background: #fffdfa;
}

.lang-switch button {
  border: 0;
  border-left: 1px solid var(--line);
  padding: 12px 18px;
  min-width: 112px;
  color: var(--ink);
  background: transparent;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
}

.lang-switch button:first-child {
  border-left: 0;
}

.lang-switch button.active {
  color: #fffdfa;
  background: var(--line-strong);
}

.campaign {
  padding-top: 20px;
  padding-bottom: 20px;
  padding-left: 0;
  padding-right: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(252, 247, 240, 0.98)),
    linear-gradient(90deg, transparent 0, transparent calc(100% - 180px), var(--blush) calc(100% - 180px), var(--blush) 100%);
}

.campaign h2 {
  font-size: clamp(20px, 3.4vw, 40px);
  color: var(--line-strong);
  padding-left: 14px;
  padding-right: 14px;
}

.campaign p {
  margin: 12px 0 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
  padding-left: 14px;
  padding-right: 14px;
}

.campaign-meta {
  margin-top: 14px;
  padding-left: 14px;
  padding-right: 14px;
}

.campaign-url {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
}

.campaign-url a {
  color: var(--muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  word-break: break-all;
}

.sequence {
  display: grid;
  gap: 18px;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(245, 223, 221, 0.7), rgba(245, 223, 221, 0.7)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.22) 0, rgba(255, 255, 255, 0.22) 1px, transparent 1px, transparent 120px),
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.22) 0, rgba(255, 255, 255, 0.22) 1px, transparent 1px, transparent 120px);
  padding-top: 0;
  padding-bottom: 0;
}

.sequence-side-top,
.sequence-side-bottom,
.sequence-main {
  display: grid;
  gap: 18px;
}

.step-block {
  position: relative;
  border-top: 0;
  border-left: 0;
  border-right: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 252, 247, 0.96);
  padding-top: 14px;
  padding-bottom: 16px;
  padding-left: clamp(14px, 1.6vw, 22px);
  padding-right: clamp(14px, 1.6vw, 22px);
  display: grid;
  gap: 14px;
}

.step-block + .step-block::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -18px;
  height: 18px;
  border-top: 1px solid rgba(134, 125, 117, 0.6);
  border-bottom: 1px solid rgba(134, 125, 117, 0.6);
  background:
    linear-gradient(180deg, rgba(245, 223, 221, 0.82), rgba(245, 223, 221, 0.82)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.22) 0, rgba(255, 255, 255, 0.22) 1px, transparent 1px, transparent 120px),
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.28) 0, rgba(255, 255, 255, 0.28) 1px, transparent 1px, transparent 18px);
}

.step-head {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(134, 125, 117, 0.42);
  padding-bottom: 10px;
}

.step-head span {
  min-width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  background: var(--line-strong);
  color: #fffdfa;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.step-head h3 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.control-file {
  display: grid;
  gap: 8px;
}

.control-file span,
.adjust-grid span {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.05em;
}

input[type=file] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #fffdfa;
  color: var(--ink);
}

.picker {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(132px, 132px);
  gap: 12px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0 10px;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-soft) #f1e8de;
}

.pick {
  border: 1px solid rgba(134, 125, 117, 0.7);
  border-radius: 0;
  padding: 6px;
  background: #fffdfa;
  cursor: pointer;
  min-width: 0;
  transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.pick:hover {
  transform: translateY(-1px);
  border-color: var(--accent-soft);
}

.pick.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(178, 31, 45, 0.2);
}

.pick img {
  width: 100%;
  display: block;
  aspect-ratio: 1;
  object-fit: cover;
  image-rendering: auto;
  background: transparent;
}

.picker-dock {
  border-top: 1px solid rgba(134, 125, 117, 0.38);
  padding-top: 12px;
  max-width: 100%;
  overflow: hidden;
}

.preview-wrap {
  display: grid;
  place-items: center;
  padding: 6px 0 2px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(247, 242, 234, 0.72)),
    linear-gradient(90deg, rgba(239, 228, 212, 0.36) 0, rgba(239, 228, 212, 0.36) 1px, transparent 1px, transparent 24px),
    linear-gradient(180deg, rgba(239, 228, 212, 0.36) 0, rgba(239, 228, 212, 0.36) 1px, transparent 1px, transparent 24px);
  background-size: auto, 24px 24px, 24px 24px;
  border: 1px solid rgba(134, 125, 117, 0.28);
}

canvas {
  width: min(100%, 560px);
  max-width: 100%;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  background: transparent;
  box-shadow: none;
  touch-action: none;
}

.adjust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

#step-adjust .preview-wrap {
  padding: 10px 10px 6px;
}

.adjust-grid label,
.tone-grid label {
  display: grid;
  gap: 6px;
}

input[type=range] {
  width: 100%;
  accent-color: var(--accent-soft);
}

.tone-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding-top: 4px;
}

.tone-grid label {
  border: 1px solid rgba(134, 125, 117, 0.62);
  background: linear-gradient(180deg, #fffdfa, var(--paper-2));
  padding: 10px 12px;
}

.tone-grid span {
  color: var(--muted);
  font-size: 12px;
}

.tone-grid strong {
  color: var(--line-strong);
  font-size: 12px;
  font-weight: 700;
  justify-self: end;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 12px 16px;
  color: var(--ink);
  background: #fffdfa;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.btn:hover {
  border-color: var(--accent-soft);
}

.btn.soft {
  background: linear-gradient(180deg, #fffdfa, var(--paper-2));
}

.btn.strong,
.btn.blue {
  color: #fffdfa;
  background: var(--line-strong);
  border-color: var(--line-strong);
}

.btn.strong:hover,
.btn.blue:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.debug-panel {
  border: 1px solid var(--line);
  padding: 10px 12px;
  background: #fffdfa;
}

.debug-panel summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.debug-toggle {
  margin-top: 8px;
  display: block;
  font-size: 12px;
  color: var(--muted);
}

.debug-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.debug-out {
  margin: 10px 0 0;
  padding: 10px;
  background: var(--paper-2);
  border: 1px solid rgba(134, 125, 117, 0.58);
  color: var(--ink);
  font-size: 11px;
  white-space: pre-wrap;
}

@media (min-width: 961px) {
  .sequence {
    grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
    align-items: start;
    column-gap: 18px;
    row-gap: 0;
  }

  .sequence-side-top {
    grid-column: 1;
    grid-row: 1;
  }

  .sequence-main {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .sequence-side-bottom {
    grid-column: 1;
    grid-row: 2;
    align-self: start;
  }

  .sequence-main .step-block::before,
  .sequence-side-top .step-block:first-child::before,
  .sequence-side-bottom .step-block:first-child::before {
    display: none;
  }

  #step-adjust canvas {
    width: min(100%, 540px);
  }
}

@media (max-width: 860px) {
  .sequence-side-top,
  .sequence-side-bottom,
  .sequence-main {
    display: contents;
  }

  .hero {
    display: grid;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 251, 246, 0.98)),
      linear-gradient(180deg, var(--paper) 0, var(--paper) 70%, var(--blush) 70%, var(--blush) 100%);
  }

  .hero-main h1 {
    max-width: none;
  }

  .lang-switch {
    justify-self: start;
  }

  .adjust-grid,
  .tone-grid {
    grid-template-columns: 1fr;
  }

  .hero,
  .campaign,
  .sequence {
    margin-inline: calc(50% - 50vw);
    padding-left: 14px;
    padding-right: 14px;
  }

  .step-block {
    padding-left: 14px;
    padding-right: 14px;
  }

  .picker {
    grid-auto-columns: minmax(128px, 128px);
  }

  canvas {
    width: min(86vw, 760px);
  }
}

@media (max-width: 560px) {
  body {
    padding: 0 0 10px;
  }

  .hero-main h1 {
    font-size: clamp(24px, 10vw, 38px);
  }

  .campaign h2 {
    font-size: clamp(20px, 9vw, 32px);
  }

  .picker {
    grid-auto-columns: minmax(108px, 108px);
    gap: 10px;
  }

  .step-block {
    padding-inline: 12px;
  }
}