:root {
  color-scheme: light;
  --bg: #fbf4e8;
  --paper: #fffdf8;
  --paper-strong: #fff8ed;
  --ink: #2c1d18;
  --muted: #73625a;
  --line: #ead8bd;
  --line-strong: #d8b77e;
  --vermilion: #b64227;
  --vermilion-dark: #8f2e1c;
  --gold: #c7962d;
  --peach: #f2c5a6;
  --plum: #7d4059;
  --success: #617b35;
  --danger: #b33a2e;
  --shadow: 0 22px 70px rgba(91, 55, 30, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(198, 150, 45, 0.16), transparent 28%),
    linear-gradient(135deg, rgba(182, 66, 39, 0.08) 0 1px, transparent 1px 18px),
    var(--bg);
  font-family: "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", system-ui, sans-serif;
  letter-spacing: 0;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  touch-action: manipulation;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.brand {
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
  text-decoration: none;
  text-transform: uppercase;
}

.top-note {
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.86);
  color: var(--muted);
  padding: 8px 11px;
  font-size: 12px;
  font-weight: 800;
}

.tool-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.14fr 0.96fr;
  gap: 18px;
  align-items: stretch;
}

.intro-panel,
.generator-panel,
.result-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 253, 248, 0.95);
  box-shadow: var(--shadow);
}

.intro-panel {
  min-height: 660px;
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.intro-panel::before,
.generator-panel::before,
.result-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 8px;
  background: linear-gradient(90deg, var(--vermilion), var(--gold), var(--peach));
}

.orbital-mark {
  position: absolute;
  right: -68px;
  top: 62px;
  width: 210px;
  height: 210px;
  border: 1px solid rgba(199, 150, 45, 0.34);
  border-radius: 50%;
  pointer-events: none;
}

.orbital-mark::before,
.orbital-mark::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.orbital-mark::before {
  inset: 36px;
  border: 1px solid rgba(182, 66, 39, 0.22);
}

.orbital-mark::after {
  width: 12px;
  height: 12px;
  right: 38px;
  top: 24px;
  background: var(--gold);
  box-shadow:
    -62px 144px 0 var(--vermilion),
    -132px 54px 0 var(--plum);
}

.section-label {
  margin: 0 0 26px;
  color: var(--vermilion-dark);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  position: relative;
  z-index: 1;
  margin: 0;
  max-width: 8.5em;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(43px, 5.4vw, 74px);
  line-height: 1.02;
  letter-spacing: 0;
}

.lead {
  position: relative;
  z-index: 1;
  max-width: 26em;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}

.keyword-strip {
  display: grid;
  gap: 8px;
  margin-top: 28px;
  color: var(--plum);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.6;
}

.notice-strip {
  margin-top: 28px;
  border: 1px solid var(--line-strong);
  background: #fff1de;
  color: var(--vermilion-dark);
  padding: 14px 15px;
  font-size: 13px;
  font-weight: 900;
  line-height: 1.6;
}

.generator-panel,
.result-panel {
  padding: 26px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field.is-full {
  grid-column: 1 / -1;
}

.field span,
.theme-title,
.output-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.field input,
.field select,
.field textarea,
.prompt-output {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  padding: 11px 12px;
  border-radius: 0;
  outline: none;
}

.field textarea,
.prompt-output {
  resize: vertical;
  line-height: 1.7;
}

.field input:focus,
.field select:focus,
.field textarea:focus,
.prompt-output:focus {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px rgba(182, 66, 39, 0.13);
}

.advanced-settings {
  border: 1px solid var(--line);
  background: #fffaf0;
  padding: 12px;
}

.advanced-settings summary {
  color: var(--plum);
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
  line-height: 1.5;
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 12px;
}

.advanced-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.theme-picker {
  display: grid;
  gap: 10px;
  margin: 17px 0;
}

.theme-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.theme-button {
  min-height: 40px;
  border: 1px solid var(--line);
  background: #fffaf0;
  color: var(--ink);
  cursor: pointer;
  font-size: 13px;
  font-weight: 900;
}

.theme-button.is-active {
  border-color: var(--vermilion-dark);
  background: var(--vermilion);
  color: #fff;
}

.button-row {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

.result-panel .button-row {
  flex-direction: column;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  border: 0;
  padding: 0 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
}

.primary-button {
  flex: 1;
  background: var(--vermilion);
  color: #fff;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--vermilion-dark);
}

.secondary-button {
  border: 1px solid var(--line-strong);
  background: var(--paper);
  color: var(--ink);
}

.result-panel {
  min-height: 660px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.prompt-output {
  flex: 1;
  min-height: 458px;
  color: #33251f;
  background:
    linear-gradient(90deg, rgba(199, 150, 45, 0.06), transparent),
    var(--paper);
  font-size: 13px;
}

.copy-status {
  min-height: 38px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.copy-status[data-type="success"] {
  color: var(--success);
  font-weight: 800;
}

.copy-status[data-type="error"] {
  color: var(--danger);
  font-weight: 800;
}

.seo-copy {
  max-width: 850px;
  margin: 72px auto 0;
  text-align: center;
}

.seo-copy h2 {
  margin: 0;
  color: var(--ink);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: clamp(27px, 3vw, 40px);
  line-height: 1.35;
  letter-spacing: 0;
}

.seo-copy h3 {
  margin: 12px 0 0;
  color: var(--vermilion-dark);
  font-size: 19px;
  line-height: 1.55;
}

.seo-copy p,
.seo-copy li {
  color: #4f4039;
  font-size: 16px;
  line-height: 2.05;
}

.seo-copy p {
  margin: 18px auto 42px;
}

.seo-copy ul {
  margin: 16px auto 42px;
  padding-left: 1.2em;
  text-align: left;
}

.faq-section {
  margin-top: 42px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.faq-item {
  margin: 26px auto 0;
  text-align: left;
}

.faq-question {
  color: var(--plum);
}

[hidden] {
  display: none !important;
}

@media (max-width: 1040px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .intro-panel,
  .result-panel {
    min-height: auto;
  }

  .prompt-output {
    min-height: 360px;
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 22px, 1180px);
    padding-top: 16px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .intro-panel,
  .generator-panel,
  .result-panel {
    padding: 20px;
  }

  h1 {
    max-width: none;
    font-size: 44px;
  }

  .form-grid,
  .theme-buttons,
  .advanced-grid {
    grid-template-columns: 1fr;
  }

  .button-row {
    flex-direction: column;
  }

  .seo-copy {
    margin-top: 52px;
  }

  .seo-copy p,
  .seo-copy li {
    font-size: 15px;
    line-height: 1.95;
  }
}