:root {
  --paper: #fafaf7;
  --paper-warm: #f4f0e6;
  --paper-deep: #ebe5d3;
  --ink: #1a1a1a;
  --ink-soft: #2a2a2a;
  --rule: #d5d0c1;
  --rule-soft: #e8e3d4;
  --muted: #6b6760;
  --accent: #8a2c2c;
  --accent-soft: #b04545;
  --highlight: #d4a72c;
  --teal: #2a5559;
  --growth: #2a7e3b;

  --serif-cn: 'Noto Serif SC', 'Source Serif 4', Georgia, serif;
  --serif-en: 'Source Serif 4', 'Noto Serif SC', Georgia, serif;
  --sans: 'Inter', 'Noto Serif SC', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-cn);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "kern", "liga";
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  z-index: 1;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.08 0 0 0 0 0.05 0 0 0 0.03 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap { position: relative; z-index: 2; }

/* ============ MASTHEAD ============ */
.masthead {
  border-bottom: 3px double var(--ink);
  background: var(--paper);
  padding: 16px 0;
}
.masthead-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted);
}
.masthead-brand {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.01em;
  text-transform: none;
}
.masthead-sep::before { content: '·'; margin: 0 12px; color: var(--rule); }

.doc-stamp {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 40px 0;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.doc-stamp .badge {
  background: var(--accent);
  color: var(--paper);
  padding: 4px 12px;
  letter-spacing: 0.18em;
}
.doc-stamp .badge-line {
  border: 1px solid var(--ink);
  padding: 3px 12px;
}

/* ============ TITLE BLOCK ============ */
.title-block {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 40px 56px;
}

.report-id {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}
.report-id::before { content: '— '; }

h1.report-title {
  font-family: var(--serif-cn);
  font-weight: 900;
  font-size: clamp(34px, 4.8vw, 60px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 28px;
  max-width: 22ch;
}
h1.report-title .em {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
  font-weight: 900;
}
h1.report-title .gold {
  background: linear-gradient(180deg, transparent 60%, rgba(212, 167, 44, 0.5) 60%);
  padding: 0 4px;
}

.subtitle {
  font-family: var(--serif-cn);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.55;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 800px;
  margin-bottom: 40px;
  border-left: 2px solid var(--accent);
  padding-left: 22px;
}

.byline {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 14px 0;
}
.byline-item .label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 10px;
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
}
.byline-item .value {
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* ============ BEFORE/AFTER HERO ============ */
.before-after {
  background: var(--ink);
  color: var(--paper);
  padding: 64px 40px;
}
.before-after-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 56px;
  align-items: center;
}
.ba-col {
  text-align: left;
}
.ba-col .ba-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.5);
  font-weight: 700;
  margin-bottom: 16px;
  border-top: 2px solid rgba(250, 250, 247, 0.3);
  padding-top: 12px;
}
.ba-col .ba-when {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--highlight);
  margin-bottom: 8px;
  font-weight: 500;
}
.ba-col .ba-metric {
  font-family: var(--serif-en);
  font-size: clamp(40px, 5vw, 64px);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.ba-col.before .ba-metric { color: rgba(250, 250, 247, 0.7); }
.ba-col.after .ba-metric { color: var(--highlight); font-style: italic; }
.ba-col .ba-unit {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.6);
  margin-bottom: 16px;
  font-weight: 500;
}
.ba-col .ba-detail {
  font-family: var(--serif-cn);
  font-size: 14px;
  color: rgba(250, 250, 247, 0.8);
  line-height: 1.6;
}

.ba-arrow {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 56px;
  color: var(--highlight);
  font-weight: 700;
  text-align: center;
  position: relative;
}
.ba-arrow::before {
  content: '6 个月';
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--sans);
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(250, 250, 247, 0.5);
  font-weight: 600;
  white-space: nowrap;
}

/* ============ TLDR / 摘要 ============ */
.tldr {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 40px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 64px;
  border-bottom: 1px solid var(--rule);
}
.tldr-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  border-top: 2px solid var(--accent);
  padding-top: 12px;
}
.tldr-text {
  font-family: var(--serif-cn);
  font-size: 19px;
  line-height: 1.8;
  color: var(--ink);
}
.tldr-text strong {
  color: var(--ink);
  font-weight: 700;
  background: linear-gradient(180deg, transparent 60%, rgba(212, 167, 44, 0.45) 60%);
  padding: 0 2px;
}
.tldr-text p { margin-bottom: 16px; }
.tldr-text p:last-child { margin-bottom: 0; }

/* ============ TOC ============ */
.toc {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 40px;
  background: var(--paper-warm);
}
.toc-inner { max-width: 1000px; margin: 0 auto; }
.toc-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 28px;
}
.toc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
}
.toc-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.4;
  transition: padding 0.2s ease;
}
.toc-item:hover { padding-left: 8px; color: var(--accent); }
.toc-item .num {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  font-weight: 700;
  min-width: 28px;
}
.toc-item .text {
  font-family: var(--serif-cn);
  font-weight: 500;
}

/* ============ SECTION ============ */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 96px 40px;
  border-bottom: 1px solid var(--rule);
}
.section-eyebrow {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 16px;
}
h2.section-h {
  font-family: var(--serif-cn);
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.005em;
  margin-bottom: 36px;
  max-width: 24ch;
  color: var(--ink);
}
h2.section-h .em {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
}

.body-text {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 24px;
}
.body-text:last-child { margin-bottom: 0; }
.body-text strong { color: var(--ink); font-weight: 700; }

/* ============ STARTING POINT METRICS GRID ============ */
.start-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 36px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.start-metric {
  padding: 28px 20px;
  border-right: 1px solid var(--rule);
}
.start-metric:last-child { border-right: none; }
.start-metric .label {
  font-family: var(--sans);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 12px;
}
.start-metric .value {
  font-family: var(--serif-en);
  font-size: 36px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.start-metric .value .small {
  font-size: 18px;
  color: var(--muted);
}
.start-metric .desc {
  font-family: var(--serif-cn);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ============ PHASE BLOCK (3 阶段) ============ */
.phase {
  background: var(--paper);
  margin: 48px 0;
  border: 1px solid var(--ink);
  position: relative;
}
.phase-header {
  background: var(--ink);
  color: var(--paper);
  padding: 28px 36px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 32px;
  align-items: center;
}
.phase-num {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 56px;
  font-weight: 900;
  color: var(--highlight);
  line-height: 0.85;
  letter-spacing: -0.02em;
}
.phase-title-block .label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  color: var(--highlight);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 8px;
}
.phase-title-block h3 {
  font-family: var(--serif-cn);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}
.phase-period {
  font-family: var(--mono);
  font-size: 12px;
  color: rgba(250, 250, 247, 0.6);
  text-align: right;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.phase-body { padding: 36px 40px; }
.phase-body .focus-line {
  font-family: var(--serif-cn);
  font-size: 18px;
  font-style: italic;
  color: var(--accent);
  margin-bottom: 24px;
  border-left: 3px solid var(--accent);
  padding-left: 16px;
}

.action-list {
  list-style: none;
  margin: 16px 0 24px;
}
.action-list li {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  font-size: 15px;
  line-height: 1.7;
}
.action-list li:last-child { border-bottom: 1px solid var(--rule); }
.action-list li .step {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 700;
  color: var(--accent);
  font-size: 14px;
}
.action-list li strong {
  color: var(--ink);
  font-weight: 700;
}

.phase-result {
  margin-top: 28px;
  padding: 24px 28px;
  background: var(--paper-warm);
  border-left: 3px solid var(--growth);
}
.phase-result-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  color: var(--growth);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 12px;
}
.phase-result-data {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 12px;
}
.phase-result-data .item .num {
  font-family: var(--serif-en);
  font-size: 24px;
  font-weight: 700;
  color: var(--growth);
  font-style: italic;
  line-height: 1;
  margin-bottom: 4px;
}
.phase-result-data .item .label {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

/* ============ MONTHLY DATA TABLE ============ */
.monthly-table-wrap {
  margin: 32px 0;
  background: var(--paper);
  border: 1px solid var(--ink);
}
.monthly-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
}
.monthly-table thead {
  background: var(--ink);
  color: var(--paper);
}
.monthly-table thead th {
  padding: 14px 16px;
  text-align: left;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.monthly-table thead th:not(:first-child) { text-align: right; }
.monthly-table tbody td {
  padding: 14px 16px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
}
.monthly-table tbody td:not(:first-child) {
  text-align: right;
  font-family: var(--mono);
  font-feature-settings: "tnum";
  font-weight: 500;
}
.monthly-table tbody td:first-child {
  font-family: var(--serif-cn);
  font-weight: 600;
  color: var(--ink);
}
.monthly-table tbody tr:hover { background: var(--paper-warm); }
.monthly-table .delta-pos { color: var(--growth); font-weight: 700; }
.monthly-table .row-final { background: var(--paper-deep); }
.monthly-table .row-final td { font-weight: 700; color: var(--ink); }

/* ============ GROWTH CHART ============ */
.growth-chart {
  margin: 36px 0;
  background: var(--paper);
  padding: 32px;
  border: 1px solid var(--rule);
}
.growth-chart-title {
  font-family: var(--sans);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 24px;
}
.chart-container {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  height: 220px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.chart-bar-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  position: relative;
}
.chart-bar {
  width: 100%;
  max-width: 60px;
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-soft) 100%);
  position: relative;
  border-radius: 1px 1px 0 0;
  transition: height 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.chart-bar.start { background: var(--rule); }
.chart-bar.end { background: linear-gradient(180deg, var(--growth) 0%, #4a9c5a 100%); }
.chart-bar-value {
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}
.chart-bar-label {
  margin-top: 8px;
  font-family: var(--sans);
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============ PULL QUOTE ============ */
.pullquote {
  margin: 48px 0;
  padding: 48px 56px;
  background: var(--paper-warm);
  border-left: 4px solid var(--accent);
  position: relative;
}
.pullquote::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 32px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 120px;
  color: var(--accent);
  line-height: 1;
  font-weight: 900;
  opacity: 0.6;
}
.pullquote-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  z-index: 2;
}
.pullquote-text {
  font-family: var(--serif-cn);
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.45;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.005em;
  position: relative;
  z-index: 2;
}

/* ============ PITFALL BLOCK (踩过的坑) ============ */
.pitfall-section {
  background: var(--paper-warm);
  padding: 96px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.pitfall-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px;
}
.pitfall-list {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.pitfall {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 32px 36px;
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  position: relative;
}
.pitfall-num-block {
  border-right: 1px solid var(--rule);
  padding-right: 24px;
}
.pitfall-num {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 48px;
  font-weight: 900;
  color: var(--accent);
  line-height: 0.9;
  letter-spacing: -0.02em;
}
.pitfall-num-label {
  font-family: var(--sans);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  font-weight: 600;
  margin-top: 8px;
}
.pitfall-content h4 {
  font-family: var(--serif-cn);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  line-height: 1.35;
}
.pitfall-content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 12px;
}
.pitfall-content p:last-child { margin-bottom: 0; }
.pitfall-content .takeaway {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--rule);
  font-style: italic;
  color: var(--accent);
  font-size: 14px;
}
.pitfall-content .takeaway::before {
  content: '→  ';
  font-style: normal;
  font-weight: 700;
}

/* ============ METHODOLOGY EXTRACT (方法论沉淀) ============ */
.method-section {
  padding: 96px 40px;
  max-width: 1080px;
  margin: 0 auto;
}
.method-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 32px;
}
.method-card {
  border: 1px solid var(--ink);
  padding: 32px 28px;
  background: var(--paper);
}
.method-card-num {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 12px;
}
.method-card h4 {
  font-family: var(--serif-cn);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--ink);
  line-height: 1.3;
}
.method-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}
.method-card p strong { color: var(--ink); font-weight: 700; }

/* ============ FOLLOWUP / 回访承诺 ============ */
.followup {
  background: var(--ink);
  color: var(--paper);
  padding: 96px 0;
}
.followup-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px;
}
.followup .section-eyebrow { color: var(--highlight); }
.followup h2 {
  font-family: var(--serif-cn);
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 28px;
  max-width: 22ch;
  color: var(--paper);
}
.followup h2 .em {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--highlight);
}
.followup p {
  font-size: 17px;
  line-height: 1.85;
  color: rgba(250, 250, 247, 0.85);
  max-width: 720px;
  margin-bottom: 24px;
}
.followup p strong { color: var(--paper); }

.timeline-future {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
  border-top: 2px solid var(--highlight);
  padding-top: 32px;
}
.timeline-future-item .when {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--highlight);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  font-weight: 600;
}
.timeline-future-item h5 {
  font-family: var(--serif-cn);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 12px;
  line-height: 1.4;
}
.timeline-future-item p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(250, 250, 247, 0.7);
  margin-bottom: 0;
}

/* ============ FAQ ============ */
.faq-section {
  padding: 96px 40px;
  max-width: 1080px;
  margin: 0 auto;
}
.faq-list { margin-top: 32px; }
.faq-item {
  padding: 28px 0;
  border-top: 1px solid var(--rule);
}
.faq-item:last-child { border-bottom: 1px solid var(--rule); }
.faq-q {
  font-family: var(--serif-cn);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  display: flex;
  gap: 16px;
  align-items: baseline;
}
.faq-q .marker {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.faq-a {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  padding-left: 32px;
}

/* ============ ABOUT ============ */
.about {
  background: var(--paper-warm);
  padding: 80px 0;
  border-top: 1px solid var(--rule);
}
.about-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px;
}
.about-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 24px;
}
.about h2 {
  font-family: var(--serif-cn);
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 24px;
  max-width: 22ch;
  color: var(--ink);
}
.about p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
  margin-bottom: 16px;
}
.about p strong { color: var(--ink); }
.about-cta {
  display: inline-block;
  margin-top: 16px;
  padding: 14px 28px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
  transition: background 0.2s ease;
}
.about-cta:hover { background: var(--accent); }
.about-cta::after { content: ' →'; }

/* ============ COLOPHON ============ */
.colophon {
  border-top: 3px double var(--ink);
  padding: 48px 40px;
  text-align: center;
  max-width: 1080px;
  margin: 0 auto;
}
.colophon-line {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  margin-bottom: 12px;
}
.colophon-meta {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  line-height: 1.8;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 880px) {
  .before-after-inner { grid-template-columns: 1fr; gap: 32px; }
  .ba-arrow { transform: rotate(90deg); }
  .tldr { grid-template-columns: 1fr; gap: 24px; padding: 56px 32px; }
  .toc-grid { grid-template-columns: 1fr; }
  .start-grid { grid-template-columns: repeat(2, 1fr); }
  .start-metric:nth-child(2) { border-right: none; }
  .start-metric:nth-child(1), .start-metric:nth-child(2) { border-bottom: 1px solid var(--rule); }
  .phase-header { grid-template-columns: 1fr; gap: 16px; }
  .phase-period { text-align: left; }
  .phase-result-data { grid-template-columns: 1fr; gap: 16px; }
  .pitfall { grid-template-columns: 1fr; gap: 16px; }
  .pitfall-num-block { border-right: none; border-bottom: 1px solid var(--rule); padding-bottom: 16px; padding-right: 0; }
  .method-grid { grid-template-columns: 1fr; }
  .timeline-future { grid-template-columns: 1fr; }
  .pullquote { margin: 32px 0; padding: 32px 28px; }
  .pullquote::before { font-size: 80px; top: -10px; left: 16px; }
  .section, .pitfall-section, .method-section, .faq-section { padding: 56px 32px; }
  .followup { padding: 64px 0; }
  .followup-inner { padding: 0 32px; }
  .title-block { padding: 28px 32px 40px; }
  .chart-container { height: 180px; }
}

@media print {
  body { background: white; }
  body::before { display: none; }
  .before-after, .followup { background: white; color: black; border: 2px solid black; }
  .before-after .ba-col .ba-metric, .followup .timeline-future-item .when { color: var(--accent); }
  .followup p, .followup h2, .timeline-future-item h5, .timeline-future-item p { color: black; }
  .phase, .pitfall { page-break-inside: avoid; }
}