:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-alt: #f7f8fa;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #888;
  --color-primary: #2d5a9e;
  --color-primary-hover: #1e4080;
  --color-primary-soft: rgba(45, 90, 158, 0.08);
  --color-border: #e0e0e0;
  --color-border-light: #efefef;
  --color-success: #2e7d32;
  --color-warning: #e65100;
  --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Noto Serif JP', Georgia, serif;
  --max-width: 920px;
  --radius: 8px;
  --shadow: 0 1px 4px rgba(0,0,0,0.06);
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); line-height: 1.8; -webkit-font-smoothing: antialiased; min-height: 100vh; display: flex; flex-direction: column; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-hover); }
h1, h2, h3 { font-family: var(--font-serif); line-height: 1.4; }

/* === Header === */
.site-header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 50; }
.site-header__inner { max-width: var(--max-width); margin: 0 auto; padding: 0.75rem 1rem; display: flex; align-items: center; justify-content: space-between; }
.site-header__logo { text-decoration: none; display: flex; align-items: center; }
.site-header__logo img { height: 36px; width: auto; }
.site-header__nav { display: flex; gap: 1.5rem; }
.site-header__nav a { color: var(--color-text-muted); font-size: 0.85rem; text-decoration: none; }
.site-header__nav a:hover { color: var(--color-text); }

/* === Main === */
main { flex: 1; max-width: var(--max-width); margin: 0 auto; padding: 1.25rem 1rem; width: 100%; }

/* === Hero === */
.hero { text-align: center; padding: 2.5rem 1rem 2rem; margin-bottom: 1rem; }
.hero h1 { font-size: 1.4rem; margin-bottom: 0.5rem; color: var(--color-text); letter-spacing: -0.01em; }
.hero p { font-size: 0.85rem; color: var(--color-text-secondary); max-width: 540px; margin: 0 auto 1.25rem; }
.hero__cta { display: inline-block; padding: 0.7rem 2rem; background: var(--color-primary); color: #fff; border-radius: var(--radius); font-size: 0.88rem; font-weight: 600; border: none; cursor: pointer; font-family: var(--font-sans); transition: background var(--transition), transform 0.1s; box-shadow: 0 2px 8px rgba(45,90,158,0.2); }
.hero__cta:hover { background: var(--color-primary-hover); color: #fff; transform: translateY(-1px); }
.hero__badges { display: flex; justify-content: center; gap: 1.5rem; margin-top: 1.25rem; font-size: 0.72rem; color: var(--color-text-muted); }
.hero__badge { display: flex; align-items: center; gap: 0.3rem; }

/* === Card === */
.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem; font-size: 0.88rem; }
.card ul, .card ol { margin: 0.75rem 0 1rem 1.5rem; color: var(--color-text-secondary); line-height: 2; }
.card li { margin-bottom: 0.4rem; }
.card h2 { margin-top: 0; margin-bottom: 0.75rem; }
.card section h2 { margin-top: 0; }

/* === Form === */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.form-section { padding: 1rem; background: var(--color-surface-alt); border-radius: var(--radius); border: 1px solid var(--color-border-light); }

.form-section__title { font-family: var(--font-sans); font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-primary); margin-bottom: 0.75rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--color-border); }

.form-row { display: flex; gap: 1rem; }
.form-row > .form-group { flex: 1; }
.form-group { margin-bottom: 0.6rem; }
.form-group label { display: block; font-size: 0.78rem; font-weight: 500; margin-bottom: 0.2rem; color: var(--color-text); }
.optional-badge { font-size: 0.65rem; font-weight: 400; color: var(--color-text-muted); margin-left: 0.3rem; }
.form-group__desc { font-size: 0.7rem; color: var(--color-text-muted); margin-bottom: 0.2rem; }

input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}
input:focus, select:focus { outline: none; border-color: var(--color-primary); }

/* === Big Five Scale === */
.big5-section-title { font-size: 0.78rem; font-weight: 600; color: var(--color-primary); margin-bottom: 0.2rem; }
.big5-trait { margin-bottom: 0.6rem; }
.big5-trait__header { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 0.2rem; }
.big5-trait__name { font-size: 0.8rem; font-weight: 600; color: var(--color-text); }
.big5-trait__value { font-size: 0.7rem; color: var(--color-text-muted); }

.big5-scale { display: grid; grid-template-columns: 5em repeat(5, 1fr) 5em; gap: 3px; align-items: center; }
.big5-scale__label { font-size: 0.62rem; color: var(--color-text-muted); }
.big5-scale__label:first-of-type { text-align: right; padding-right: 4px; }
.big5-scale__label:last-of-type { text-align: left; padding-left: 4px; }
.big5-scale__option { flex: 1; }
.big5-scale__option input[type="radio"] { clip: rect(0,0,0,0); position: absolute; width: 1px; height: 1px; overflow: hidden; }
.big5-scale__option label {
  display: flex; align-items: center; justify-content: center;
  height: 34px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--color-text-muted);
  background: var(--color-surface);
}
.big5-scale__option input:checked + label {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}
.big5-scale__option label:hover { border-color: var(--color-primary); }

/* === Button === */
.btn { display: inline-block; padding: 0.7rem 1.75rem; border: none; border-radius: var(--radius); font-size: 0.9rem; font-weight: 600; font-family: var(--font-sans); cursor: pointer; transition: background var(--transition); text-decoration: none; text-align: center; }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn--full { width: 100%; }
.btn--outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text-secondary); }
.btn--outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* === Results === */
.result-card { text-align: center; padding: 0; overflow: hidden; }
.result-header { padding: 2.5rem 1.5rem 2rem; background: linear-gradient(135deg, var(--color-primary-soft) 0%, transparent 60%); border-bottom: 1px solid var(--color-border-light); margin-bottom: 0; }
.result-section { text-align: left; background: var(--color-surface-alt); border-radius: var(--radius); padding: 1.5rem; margin: 1.25rem 1.5rem; }
.result-section:last-of-type { margin-bottom: 1.5rem; }
.result-section__title { font-family: var(--font-serif); font-size: 1.15rem; font-weight: 700; color: var(--color-text); margin-bottom: 1.25rem; padding-bottom: 0.6rem; border-bottom: 2px solid var(--color-primary); }
.trait-block { margin-bottom: 1.5rem; padding: 1.25rem; background: var(--color-surface); border-radius: 8px; border: 1px solid var(--color-border); box-shadow: 0 1px 3px rgba(0,0,0,0.04); }
.trait-block h4 { font-size: 0.95rem; font-weight: 700; color: var(--color-text); margin-bottom: 0.75rem; padding-left: 0.75rem; border-left: 3px solid var(--color-primary); }
.trait-block p { font-size: 0.9rem; color: var(--color-text-secondary); line-height: 1.9; margin-bottom: 0.75rem; }
.trait-block p:last-child { margin-bottom: 0; }
.trait-block p strong { color: var(--color-text); font-weight: 600; }
.axis-level { font-size: 0.72rem; font-weight: 600; white-space: nowrap; }
.axis-level--high { color: var(--color-success); }
.axis-level--mid { color: var(--color-primary); }
.axis-level--low { color: #c07020; }
.result-score__number { display: none; }
.result-score__rank { font-family: var(--font-serif); font-size: 3rem; font-weight: 700; color: var(--color-primary); line-height: 1; padding: 0.5rem 0; letter-spacing: -0.02em; }
.result-score__message { font-size: 0.9rem; color: var(--color-text-secondary); margin-top: 1.25rem; max-width: 100%; margin-left: auto; margin-right: auto; line-height: 1.9; text-align: left; }
.result-score__message p { margin-bottom: 1rem; }
.result-score__message p:last-child { margin-bottom: 0; }

/* === Axis Bars === */
.axis-bars { max-width: 480px; margin: 1.25rem auto; }
.axis-bar { display: grid; grid-template-columns: 5em 1fr auto; align-items: center; gap: 0.75rem; margin-bottom: 0.9rem; }
.axis-bar__label { font-size: 0.8rem; font-weight: 500; color: var(--color-text); }
.axis-bar__track { height: 8px; background: var(--color-border-light); border-radius: 4px; overflow: hidden; }
.axis-bar__fill { height: 100%; border-radius: 4px; transition: width 0.8s ease; }
.axis-bar__fill--high { background: var(--color-success); }
.axis-bar__fill--mid { background: var(--color-primary); }
.axis-bar__fill--low { background: var(--color-warning); }

/* === Radar === */
.radar-container { padding: 1rem 0; max-width: 500px; margin: 0 auto; }
.comparison { background: var(--color-surface); border-radius: 8px; padding: 1.25rem; border: 1px solid var(--color-border-light); }
.comparison__legend { display: flex; align-items: center; gap: 1.25rem; justify-content: center; font-size: 0.8rem; font-weight: 500; color: var(--color-text-secondary); margin-bottom: 1rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--color-border-light); }
.comparison__dot { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 0.3rem; }
.comparison__dot--p1 { background: var(--color-primary); }
.comparison__dot--p2 { background: #c0392b; }
.comparison__row { display: grid; grid-template-columns: 4.5em 1fr 3em; align-items: center; gap: 0.6rem; margin-bottom: 0.6rem; }
.comparison__label { font-size: 0.82rem; font-weight: 500; color: var(--color-text); }
.comparison__bars { position: relative; height: 20px; background: var(--color-border-light); border-radius: 4px; overflow: hidden; }
.comparison__bar { position: absolute; height: 8px; border-radius: 3px; }
.comparison__bar--p1 { top: 2px; background: var(--color-primary); }
.comparison__bar--p2 { bottom: 2px; background: #c0392b; }
.comparison__values { font-size: 0.7rem; color: var(--color-text-muted); text-align: right; }

/* === Analysis Sections === */
.analysis-section { text-align: left; max-width: 100%; margin: 0 auto 1.5rem; }
.analysis-item { font-size: 0.88rem; color: var(--color-text-secondary); margin-bottom: 0.75rem; line-height: 1.85; }
.analysis-item strong { color: var(--color-primary); font-weight: 600; }
.advice-list { list-style: none; padding: 0; margin: 0.75rem 0; }
.advice-list li { font-size: 0.88rem; color: var(--color-text-secondary); line-height: 1.85; padding: 0.85rem 0 0.85rem 1.5em; position: relative; border-bottom: 1px solid var(--color-border-light); }
.advice-list li:last-child { border-bottom: none; }
.advice-list li::before { content: "\2192"; position: absolute; left: 0; color: var(--color-primary); font-weight: 600; }
.advice-list li strong { color: var(--color-text); display: block; margin-bottom: 0.25rem; }

/* === Strengths Grid === */
.strengths-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 0.75rem; }
.strengths-card { padding: 1rem; border: 1px solid var(--color-border-light); border-radius: 8px; background: var(--color-surface); }
.strengths-card--good { border-left: 4px solid var(--color-primary); }
.strengths-card--warn { border-left: 4px solid #c07020; }
.strengths-card__title { font-size: 0.8rem; font-weight: 700; margin-bottom: 0.4rem; }
.strengths-card--good .strengths-card__title { color: var(--color-primary); }
.strengths-card--warn .strengths-card__title { color: #c07020; }
.strengths-card__text { font-size: 0.82rem; color: var(--color-text-secondary); line-height: 1.65; }
@media (max-width: 600px) { .strengths-grid { grid-template-columns: 1fr; } }
.methodology-note { font-size: 0.75rem; color: var(--color-text-muted); border-top: 1px solid var(--color-border-light); padding: 1rem 1.5rem 0; margin-top: 0; text-align: center; }

/* === Feedback Widget === */
.feedback-widget { text-align: center; margin: 1.5rem 1.5rem 0; padding: 1.5rem 0; border-top: 1px solid var(--color-border-light); }
.feedback-widget__label { font-size: 0.85rem; color: var(--color-text-secondary); margin-bottom: 0.75rem; }
.feedback-widget__btns { display: flex; justify-content: center; gap: 1rem; }
.feedback-btn { font-size: 1.5rem; padding: 0.5rem 1rem; border: 1px solid var(--color-border-light); border-radius: 8px; background: var(--color-surface); cursor: pointer; transition: transform 0.1s, border-color 0.2s; }
.feedback-btn:hover { transform: scale(1.1); border-color: var(--color-primary); }
.feedback-btn.active { border-color: var(--color-primary); background: var(--accent-glow, #f0f0ff); }
.feedback-widget__form { margin-top: 1rem; max-width: 400px; margin-left: auto; margin-right: auto; }
.feedback-widget__textarea { width: 100%; min-height: 80px; padding: 0.75rem; border: 1px solid var(--color-border-light); border-radius: 6px; font-size: 0.85rem; resize: vertical; font-family: inherit; }
.feedback-widget__submit { margin-top: 0.5rem; }
.feedback-widget__thanks { font-size: 0.85rem; color: var(--color-success); margin-top: 0.75rem; }
.btn--small { padding: 0.4rem 1rem; font-size: 0.8rem; }

/* === Analyzing Animation === */
.analyzing { text-align: center; padding: 3rem 1.5rem; }
.analyzing__icon { margin-bottom: 1.5rem; }
.analyzing__step { font-size: 0.95rem; font-weight: 500; color: var(--color-text); margin-bottom: 1.25rem; transition: opacity 0.3s; }
.analyzing__bar { width: 100%; max-width: 300px; height: 6px; background: var(--color-border-light); border-radius: 3px; margin: 0 auto; overflow: hidden; }
.analyzing__progress { height: 100%; width: 0; background: var(--color-primary); border-radius: 3px; transition: width 0.6s ease; }

/* === Result Accordion === */
.result-accordion { border: none; }
.result-accordion summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; }
.result-accordion summary::-webkit-details-marker { display: none; }
.result-accordion summary::after { content: "\25BC"; font-size: 0.7rem; color: var(--color-text-muted); transition: transform 0.2s; }
.result-accordion[open] summary::after { transform: rotate(180deg); }
.result-accordion summary.result-section__title { border-bottom: 2px solid var(--color-primary); padding-bottom: 0.6rem; margin-bottom: 0; }
.result-accordion[open] summary.result-section__title { margin-bottom: 1.25rem; }
.result-accordion > div { animation: accordion-open 0.3s ease; }
@keyframes accordion-open { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* === Footer === */
.site-footer { background: var(--color-surface); border-top: 1px solid var(--color-border); margin-top: 1.5rem; }
.site-footer__inner { max-width: var(--max-width); margin: 0 auto; padding: 1rem; text-align: center; }
.site-footer__links { margin-bottom: 0.75rem; display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; }
.site-footer a { color: var(--color-text-muted); font-size: 0.8rem; }
.site-footer a:hover { color: var(--color-text); }
.site-footer p { color: var(--color-text-muted); font-size: 0.75rem; }

/* === Article === */
.article-body h2 { font-size: 1.2rem; margin: 1.5rem 0 0.5rem; color: var(--color-text); }
.article-body h3 { font-size: 1rem; margin: 1rem 0 0.4rem; }
.article-body p { margin-bottom: 0.75rem; color: var(--color-text-secondary); }
.article-body ul, .article-body ol { margin: 0.5rem 0 0.75rem 1.5rem; color: var(--color-text-secondary); }
.article-body li { margin-bottom: 0.3rem; }
.article-body strong { color: var(--color-text); }
.breadcrumb { font-size: 0.75rem; color: var(--color-text-muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }

/* === Responsive === */
@media (max-width: 768px) {
  .form-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.2rem; }
  main { padding: 1rem; }
  .card { padding: 1rem; }
  .result-header { padding: 2rem 1rem 1.5rem; }
  .result-section { margin: 1rem; padding: 1.25rem; }
  .result-score__rank { font-size: 2.2rem; }
  .hero__badges { flex-direction: column; gap: 0.4rem; }
}

@media (max-width: 480px) {
  .big5-scale__option label { height: 30px; font-size: 0.72rem; }
  .form-section { padding: 1rem; }
  .result-section { margin: 0.75rem; padding: 1rem; }
}

/* === Theme Toggle === */
.theme-toggle { background: none; border: none; font-size: 1.2rem; cursor: pointer; padding: 0.4rem; border-radius: 50%; transition: background 0.2s; }
.theme-toggle:hover { background: rgba(0,0,0,0.05); }

/* === Dark Mode === */
[data-theme="dark"] { --color-bg: #1a1a2e; --color-text: #e0e0e0; --color-text-secondary: #b0b0c0; --color-text-muted: #777; --color-primary: #5b8fd9; --color-primary-hover: #7aa8e8; --color-primary-soft: rgba(91,143,217,0.1); --color-border: #2a2a3e; --color-border-light: #2a2a3e; --color-surface: #222238; --color-surface-alt: #1e1e32; --color-card-bg: #222238; }
[data-theme="dark"] .site-header { background: #1e1e32; border-color: #2a2a3e; }
[data-theme="dark"] .card { background: var(--color-card-bg); }
[data-theme="dark"] .site-footer { background: #16162a; border-color: #2a2a3e; }
[data-theme="dark"] .theme-toggle:hover { background: rgba(255,255,255,0.1); }
[data-theme="dark"] .article-toc { background: #1e1e32; }

/* === Article Meta === */
.article-meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; font-size: 0.78rem; color: var(--color-text-muted); }
.reading-time { font-weight: 500; }

/* === Article TOC === */
.article-toc { margin-bottom: 2rem; padding: 1rem; background: #f8f9fa; border-radius: 8px; }
.article-toc ol { margin-top: 0.5rem; padding-left: 1.25rem; }
.article-toc li { margin-bottom: 0.25rem; }
.article-toc a { color: var(--color-primary); text-decoration: none; font-size: 0.85rem; }
.article-toc a:hover { text-decoration: underline; }

/* === Share Section === */
.share-section { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border-light); }
.share-section__title { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.75rem; }
.share-btns { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.share-btn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.8rem; font-weight: 500; text-decoration: none; color: #fff; transition: transform 0.15s, opacity 0.15s; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; }
.share-btn--x { background: #000; }
.share-btn--hatena { background: #00a4de; }
.share-btn--copy { background: #6c757d; border: none; cursor: pointer; color: #fff; font-size: 0.8rem; font-weight: 500; }

/* === Related Articles === */
.related-articles { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--color-border-light); }
.related-articles__title { font-size: 0.85rem; font-weight: 600; margin-bottom: 0.75rem; }
.related-articles__list { list-style: none; padding: 0; }
.related-articles__list li { margin-bottom: 0.5rem; }
.related-articles__list a { color: var(--color-primary); text-decoration: none; font-size: 0.85rem; }
.related-articles__list a:hover { text-decoration: underline; }

/* Amazon Associate Block Link */
.amazon-link-block { margin: 2rem 0; text-align: center; }
.amazon-link-block__btn { display: inline-block; padding: 0.9rem 2rem; background: #f5a623; color: #fff; font-weight: 600; font-size: 0.95rem; border-radius: 8px; text-decoration: none; transition: background 0.2s, transform 0.1s; box-shadow: 0 2px 8px rgba(245,166,35,0.3); }
.amazon-link-block__btn:hover { background: #e6950f; transform: translateY(-1px); }