:root {
  --ink: #1b2422;
  --body: #3f4d49;
  --muted: #66736f;
  --line: #e2e0d8;
  --paper: #f7f6f1;
  --white: #ffffff;
  --accent: #0f766e;
  --accent-dark: #0b4f4a;
  --gold: #a96f20;
  --soft: #eef4ef;
  --soft-gold: #fff4df;
  --dark: #10211f;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, #ffffff 0, var(--paper) 420px, var(--paper) 100%);
  letter-spacing: 0;
}

a { color: inherit; }

.blog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 32px;
  background: rgba(255,255,255,0.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}

.blog-brand {
  font-weight: 800;
  font-size: 18px;
  text-decoration: none;
}

.blog-nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.blog-nav a {
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.blog-nav a:hover { border-color: var(--accent); color: var(--accent-dark); }

.blog-layout {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 34px;
  padding: 42px 0 72px;
}

.blog-intro {
  grid-column: 1 / -1;
  max-width: 820px;
  padding: 18px 0 6px;
}

.blog-kicker,
.mailbox-label,
.category,
.article-meta,
.author-label {
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
}

.blog-intro h1 {
  margin: 8px 0 14px;
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.15;
  letter-spacing: 0;
}

.blog-intro p,
.list-head p,
.list-item p,
.mailbox p {
  color: var(--muted);
  line-height: 1.9;
}

.article-list { display: grid; gap: 12px; }

.list-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 2px;
}

.list-head h2 { margin: 0; font-size: 28px; }
.list-head p { margin: 6px 0 0; }

.list-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease;
}

.list-item:hover {
  transform: translateY(-1px);
  border-color: #b7cbc5;
  box-shadow: 0 10px 26px rgba(17, 34, 31, 0.07);
}

.list-item a,
.list-item.placeholder {
  display: block;
  padding: 22px 24px;
  text-decoration: none;
}

.category {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--soft);
}

.list-item h3 {
  margin: 10px 0 8px;
  font-size: 23px;
  line-height: 1.45;
  letter-spacing: 0;
}

.list-item p { margin: 0; }
.placeholder { opacity: 0.72; }
.sidebar { align-self: start; }

.mailbox {
  position: sticky;
  top: 86px;
  padding: 22px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  background: var(--dark);
  color: var(--white);
  box-shadow: 0 16px 38px rgba(16,33,31,0.14);
}

.mailbox h2 {
  margin: 8px 0 10px;
  font-size: 24px;
  line-height: 1.35;
}

.mailbox p { color: rgba(255,255,255,0.76); }

.mailbox input,
.mailbox button,
.article-cta input,
.article-cta button {
  width: 100%;
  min-height: 46px;
  border-radius: 6px;
  font-size: 15px;
}

.mailbox input,
.article-cta input {
  margin-top: 8px;
  padding: 0 12px;
  border: 1px solid var(--line);
}

.mailbox button,
.article-cta button {
  margin-top: 10px;
  border: 0;
  background: var(--gold);
  color: var(--white);
  font-weight: 800;
  cursor: pointer;
}

.mailbox button:hover,
.article-cta button:hover { background: #8f5f1d; }
.mailbox-note { font-size: 12px; }

.blog-footer {
  padding: 28px 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.article-shell {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 800px) 300px;
  gap: 44px;
  padding: 42px 0 76px;
}

.article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(28px, 5vw, 52px);
  box-shadow: 0 18px 48px rgba(17, 34, 31, 0.06);
}

.article-meta {
  display: inline-block;
  margin: 0 0 10px;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--soft);
}

.article h1 {
  margin: 8px 0 18px;
  max-width: 12em;
  font-size: clamp(32px, 4.6vw, 48px);
  line-height: 1.2;
  letter-spacing: 0;
}

.article-lead {
  margin: 0 0 28px;
  padding: 18px 20px;
  border-left: 4px solid var(--gold);
  background: var(--soft-gold);
  color: #3a3125;
  font-size: 18px;
  line-height: 1.95;
}

.article p,
.article li {
  color: var(--body);
  font-size: 16px;
  line-height: 2.05;
}

.article p { margin: 0 0 16px; }

.article h2 {
  margin: 48px 0 16px;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(23px, 3vw, 30px);
  line-height: 1.42;
}

.article h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 1em;
  margin-right: 10px;
  border-radius: 999px;
  background: var(--accent);
  vertical-align: -0.14em;
}

.article h3 {
  margin: 30px 0 10px;
  font-size: 20px;
  line-height: 1.55;
}

.article ul,
.article ol {
  margin: 14px 0 28px;
  padding-left: 1.35em;
}

.article li { margin-bottom: 8px; }

.article > ul:not(.related-list),
.article > ol,
.checklist {
  padding: 18px 22px 18px 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.note-box {
  margin: 30px 0;
  padding: 18px 20px;
  border: 1px solid #bfd7d0;
  border-left: 5px solid var(--accent);
  border-radius: 8px;
  background: var(--soft);
}

.note-box p { margin: 0; color: #263a36; }

.article-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 18px 0 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  font-size: 14px;
}

.article-table th,
.article-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
}

.article-table tr:last-child td { border-bottom: 0; }
.article-table th { background: var(--soft); color: var(--accent-dark); font-weight: 800; }
.article-table td { color: var(--body); }

.related-list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 16px 0 34px;
  list-style: none;
}

.related-list li { margin: 0; }

.related-list a {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--accent-dark);
  font-weight: 800;
  text-decoration: none;
  background: #fbfcfa;
}

.related-list a:hover { border-color: #b7cbc5; background: var(--soft); }

.author-profile {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  margin-top: 44px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.author-profile picture { display: block; width: 120px; }
.author-profile img {
  width: 150px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 8px;
}

.author-profile h2 {
  margin: 4px 0 8px;
  padding: 0;
  border: 0;
  font-size: 24px;
}

.author-profile h2::before { display: none; }
.author-profile p { margin: 0 0 8px; font-size: 14px; line-height: 1.8; }
.author-label { margin-bottom: 3px; }

.article-cta {
  margin-top: 28px;
  padding: 26px;
  border-radius: 8px;
  background: var(--dark);
  color: var(--white);
}

.article-cta h2 {
  margin-top: 0;
  padding-bottom: 0;
  border: 0;
  color: var(--white);
}

.article-cta h2::before { background: var(--gold); }
.article-cta p { color: rgba(255,255,255,0.78); }

@media (max-width: 900px) {
  .blog-layout,
  .article-shell { grid-template-columns: 1fr; }
  .blog-intro { grid-column: auto; }
  .mailbox { position: static; }
  .article h1 { max-width: none; }
}

@media (max-width: 680px) {
  .blog-header { display: block; padding: 17px 20px; position: static; }
  .blog-nav { margin-top: 12px; flex-wrap: wrap; }
  .blog-layout,
  .article-shell { width: min(100% - 28px, 1120px); padding-top: 26px; }
  .list-head { display: block; }
  .article { padding: 24px 18px; }
  .article-lead { font-size: 16px; }
  .article-table { display: block; overflow-x: auto; white-space: nowrap; }
  .article-table th,
  .article-table td { min-width: 180px; white-space: normal; }
  .author-profile { grid-template-columns: 92px minmax(0, 1fr); gap: 14px; padding: 16px; }
  .author-profile picture { display: block; width: 120px; }
.author-profile img { width: 92px; }
  .author-profile h2 { font-size: 20px; }
}

/* Reading structure refinements */
.article-section {
  margin-top: 42px;
}

.intro-section,
.compact-section {
  margin-top: 34px;
}

.section-brief {
  margin-bottom: 14px !important;
  color: var(--body) !important;
  font-weight: 400;
}

.box-label {
  margin: 0 0 6px !important;
  color: var(--gold) !important;
  font-size: 13px !important;
  font-weight: 800;
}

.takeaway-box,
.toc-box,
.practice-box,
.side-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.takeaway-box {
  margin: 30px 0 18px;
  padding: 24px;
  border-left: 5px solid var(--gold);
  background: linear-gradient(180deg, #fff5df 0%, #fffdf8 58%, #fbfcfa 100%);
}

.takeaway-box h2 {
  margin: 0 0 14px;
  padding: 0;
  border: 0;
  color: #2c2418;
  font-size: clamp(20px, 3vw, 25px);
  line-height: 1.55;
}

.takeaway-box h2::before,
.practice-box h2::before,
.toc-box h2::before,
.side-card h2::before { display: none; }

.takeaway-box ul,
.practice-box ol,
.toc-box ol {
  margin: 12px 0 0;
}

.toc-box {
  margin: 18px 0 34px;
  padding: 20px 22px;
}

.toc-box ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px 18px;
  padding-left: 1.25em;
}

.toc-box li {
  margin-bottom: 0;
  line-height: 1.65;
}

.toc-box a {
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
}

.toc-box a:hover { text-decoration: underline; }

.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0 !important;
  border: 0 !important;
  background: transparent !important;
}

.step-list li {
  position: relative;
  margin: 0 0 10px;
  padding: 12px 14px 12px 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
}

.step-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 13px;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  line-height: 22px;
  text-align: center;
}

.practice-box {
  margin: 42px 0 30px;
  padding: 24px;
  border-left: 5px solid var(--accent);
  background: var(--soft);
}

.practice-box h2 {
  margin: 0 0 12px;
  padding: 0;
  border: 0;
  font-size: 25px;
}

.practice-box p:last-child { margin-bottom: 0; }

.article-sidebar {
  display: grid;
  gap: 18px;
}

.side-card {
  padding: 20px;
}

.side-card h2 {
  margin: 6px 0 12px;
  padding: 0;
  border: 0;
  font-size: 22px;
  line-height: 1.4;
}

.side-card .related-list {
  margin-bottom: 0;
}

.side-card .related-list a {
  padding: 10px 12px;
  font-size: 14px;
  line-height: 1.55;
}

.article-sidebar .mailbox {
  position: sticky;
  top: 86px;
}

.article-sidebar .side-card + .mailbox {
  position: static;
}

.article > .article-section:first-of-type {
  margin-top: 30px;
}

@media (max-width: 900px) {
  .article-sidebar { gap: 14px; }
  .article-sidebar .mailbox { position: static; }
}

@media (max-width: 680px) {
  .takeaway-box,
  .toc-box,
  .practice-box { padding: 18px; }
  .toc-box ol { grid-template-columns: 1fr; }
  .article-section { margin-top: 34px; }
}

/* Subtle article readability */
.checklist li::marker,
.article-section ul:not(.related-list) li::marker {
  color: var(--accent);
  font-weight: 800;
}

.article-table th:first-child,
.article-table td:first-child {
  border-right: 1px solid var(--line);
}

.article-table td:first-child {
  background: #fbfcfa;
  color: #263a36;
  font-weight: 700;
}
.visual-process {
  margin: 26px 0 38px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, #fffdf8 0%, #ffffff 58%, #f6f7f1 100%);
}

.visual-process ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.visual-process li {
  position: relative;
  min-height: 118px;
  margin: 0;
  padding: 18px 14px 14px;
  border: 1px solid #e0d8c8;
  border-radius: 8px;
  background: #ffffff;
}

.visual-process li:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -13px;
  top: 50%;
  width: 14px;
  height: 1px;
  background: #c9b58f;
}

.visual-process span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.visual-process strong {
  display: block;
  color: #263a36;
  font-size: 15px;
  line-height: 1.7;
}

@media (max-width: 760px) {
  .visual-process ol { grid-template-columns: 1fr; }
  .visual-process li { min-height: auto; }
  .visual-process li:not(:last-child)::after {
    right: auto;
    left: 24px;
    top: auto;
    bottom: -13px;
    width: 1px;
    height: 14px;
  }
}