/* =============================================================
   Ðong Philosophy Lab — Writing Style Sheet
   Editorial / refined aesthetic with serif typography
   ============================================================= */

:root {
  --paper:        #f4efe6;
  --paper-warm:   #ebe4d4;
  --ink:          #1a1612;
  --ink-soft:     #4a423a;
  --ink-faint:    #8a7f72;
  --rule:         #c8bda8;
  --rule-soft:    #d8cfbd;
  --accent:       #6e1f2a;
  --accent-soft:  #8b3340;
  --highlight:    #efe5cf;

  --serif-sc:     "Noto Serif SC", "Songti SC", "STSong", "宋体", serif;
  --serif-en:     "EB Garamond", "Noto Serif SC", Georgia, serif;

  --measure:      640px;
  --measure-wide: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       #1a1714;
    --paper-warm:  #221d18;
    --ink:         #ebe4d4;
    --ink-soft:    #c4baa8;
    --ink-faint:   #8a7f72;
    --rule:        #3a342c;
    --rule-soft:   #2c2620;
    --accent:      #c47882;
    --accent-soft: #a85e6a;
    --highlight:   #2a231d;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--serif-en), var(--serif-sc);
  font-weight: 400;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
  padding: 0;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(110, 31, 42, 0.015) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(110, 31, 42, 0.015) 0%, transparent 40%);
  mix-blend-mode: multiply;
}

/* ============================================================ */
/* Site header & footer                                         */
/* ============================================================ */

/* Top D banner — a big Ð that links to i-wild.com.
   Sits above site-header. Also serves as WeChat Moments crawl target. */
.d-banner {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 28px 0 12px;
  background: var(--paper);
  text-decoration: none;
  border: none;
}

.d-banner-img {
  width: 64px;
  height: 64px;
  display: block;
  border: none;
  box-shadow: none;
  background: transparent;
  transition: transform 0.2s ease;
}

.d-banner:hover .d-banner-img {
  transform: scale(1.05);
}

@media (max-width: 768px) {
  .d-banner { padding: 20px 0 8px; }
  .d-banner-img { width: 52px; height: 52px; }
}

.site-header {
  position: relative;
  z-index: 10;
  padding: 32px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--rule-soft);
}

.site-mark {
  font-family: var(--serif-en);
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}

.site-mark .lab {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}

.site-nav {
  font-family: var(--serif-en);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.site-nav a {
  color: inherit;
  text-decoration: none;
  margin-left: 28px;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--accent);
}

.site-footer {
  text-align: center;
  padding: 60px 40px 80px;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
  font-style: italic;
}

/* ============================================================ */
/* Article: title block & sections                              */
/* ============================================================ */

article {
  position: relative;
  z-index: 2;
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 80px 40px 120px;
}

.title-block {
  text-align: center;
  margin-bottom: 100px;
  position: relative;
}

.eyebrow {
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 32px;
  font-style: italic;
}

h1 {
  font-family: var(--serif-sc);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin-bottom: 28px;
}

.subtitle {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 540px;
  margin: 0 auto 48px;
}

.subtitle .cn {
  font-family: var(--serif-sc);
  font-style: normal;
  font-weight: 400;
}

.title-rule {
  width: 60px;
  height: 1px;
  background: var(--accent);
  margin: 0 auto 32px;
}

.byline {
  font-family: var(--serif-en);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.byline .author {
  color: var(--ink-soft);
}

.byline .sep {
  display: inline-block;
  margin: 0 14px;
  color: var(--rule);
}

.byline-date,
.byline-views {
  font-family: var(--serif-en);
  letter-spacing: 0.16em;
  font-size: 13px;
}

.byline-views {
  color: var(--ink-faint);
  font-style: italic;
}

#view-count {
  font-style: normal;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-left: 2px;
}

#view-count[data-loading] {
  color: var(--rule);
  font-weight: 400;
  letter-spacing: 0.18em;
}

/* Tag chips on article header */
.byline-tags {
  margin-top: 18px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent-soft);
}

.byline-tags a {
  color: inherit;
  text-decoration: none;
  margin: 0 6px;
  border-bottom: 1px dotted transparent;
  transition: border-color 0.2s;
}

.byline-tags a:hover {
  border-bottom-color: var(--accent);
}

/* Sections */

.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding-top: 80px;
}

.section.intro {
  padding-top: 0;
}

.section-number {
  display: block;
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

h2 {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: clamp(28px, 3.5vw, 36px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin-bottom: 56px;
  position: relative;
  padding-bottom: 24px;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 1px;
  background: var(--ink-soft);
}

h3 {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 24px);
  line-height: 1.4;
  color: var(--ink);
  margin: 56px 0 24px;
  letter-spacing: 0.02em;
}

h3 .h3-num {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
  margin-right: 12px;
}

/* Paragraphs */

p {
  margin-bottom: 28px;
  font-family: var(--serif-sc);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.95;
  color: var(--ink);
  text-align: justify;
  text-justify: inter-ideograph;
  hanging-punctuation: allow-end;
}

p strong {
  font-weight: 600;
  color: var(--ink);
  background-color: var(--highlight);
  padding: 0.05em 0.2em;
  border-radius: 1px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

p em {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 400;
  color: var(--ink-soft);
}

p a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.2s;
}

p a:hover {
  border-bottom-color: var(--accent);
}

/* First-letter drop cap on first paragraph after section title */
.section > h2 + p::first-letter,
.section > h2 + p:first-of-type::first-letter {
  font-family: var(--serif-sc);
  font-weight: 600;
  font-size: 4.2em;
  float: left;
  line-height: 0.85;
  margin: 8px 12px 0 0;
  color: var(--accent);
}

/* Intro paragraph (first paragraph of article) */
.intro p:first-of-type {
  font-size: 19px;
  line-height: 1.85;
  color: var(--ink-soft);
  font-weight: 400;
}

/* Pull quote */
.pull {
  font-family: var(--serif-sc);
  font-style: normal;
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink);
  padding: 28px 32px;
  margin: 40px 0;
  background: var(--paper-warm);
  border-left: 2px solid var(--accent);
  position: relative;
}

/* Section divider */
.divider {
  display: block;
  text-align: center;
  margin: 80px auto;
  font-family: var(--serif-en);
  color: var(--rule);
  letter-spacing: 1em;
  font-size: 14px;
}

/* Table */
.table-wrap {
  margin: 48px 0;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--serif-sc);
  font-size: 15px;
  line-height: 1.6;
}

table caption {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-faint);
  text-align: left;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

th {
  font-weight: 500;
  text-align: left;
  padding: 14px 16px 14px 0;
  border-bottom: 1.5px solid var(--ink-soft);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--serif-en);
}

td {
  padding: 18px 16px 18px 0;
  vertical-align: top;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink-soft);
}

td:first-child {
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  font-size: 15px;
}

td:last-child {
  color: var(--ink);
  font-weight: 400;
}

/* Coda / closing */
.coda {
  text-align: center;
  margin-top: 100px;
  padding-top: 60px;
  border-top: 1px solid var(--rule-soft);
}

.coda-mark {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-faint);
  letter-spacing: 0.12em;
}

.coda-date {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 16px;
  color: var(--ink-soft);
  margin-top: 12px;
  letter-spacing: 0.08em;
}

/* Reading progress bar */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 100;
  width: 0%;
  transition: width 0.1s ease-out;
}

/* ============================================================ */
/* Prev/Next navigation at article foot                         */
/* ============================================================ */

.article-nav {
  max-width: var(--measure);
  margin: 80px auto 0;
  padding-top: 60px;
  border-top: 1px solid var(--rule-soft);
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 40px;
}

.article-nav > a,
.article-nav > .nav-empty {
  flex: 1 1 50%;
  max-width: 50%;
}

.article-nav a {
  text-decoration: none;
  color: var(--ink);
  display: block;
  padding: 24px 0;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: all 0.25s;
}

.article-nav a:hover {
  border-color: var(--rule);
  background: var(--paper-warm);
  padding-left: 16px;
  padding-right: 16px;
}

.article-nav .nav-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.article-nav .nav-title {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: 17px;
  color: var(--ink);
  line-height: 1.4;
}

.article-nav .nav-prev { text-align: left; }
.article-nav .nav-next { text-align: right; }
.article-nav .nav-empty {
  visibility: hidden;
}

/* ============================================================ */
/* Index page (article list)                                    */
/* ============================================================ */

.index-page {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 80px 40px 120px;
  position: relative;
  z-index: 2;
}

.index-header {
  text-align: center;
  margin-bottom: 100px;
}

.index-header h1 {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: clamp(36px, 5vw, 52px);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}

.index-header .index-tagline {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 19px;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Tag bar at top of index */
.tag-bar {
  text-align: center;
  margin: 40px 0 0;
  padding: 24px 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--serif-en);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag-bar .tag-label {
  color: var(--ink-faint);
  font-style: italic;
  margin-right: 18px;
}

.tag-bar a {
  color: var(--ink-soft);
  text-decoration: none;
  margin: 0 12px;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: all 0.2s;
}

.tag-bar a:hover,
.tag-bar a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tag-bar .tag-count {
  font-style: italic;
  color: var(--ink-faint);
  font-size: 11px;
  margin-left: 4px;
}

/* ============================================================ */
/* Figures (images + captions)                                  */
/* ============================================================ */

figure {
  margin: 48px 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border: 1px solid var(--rule-soft);
  border-radius: 1px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.04);
}

figure figcaption {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-faint);
  margin-top: 14px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  padding: 0 20px;
}

figure figcaption strong {
  font-family: 'SF Mono', Menlo, monospace;
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  margin-right: 8px;
  background: none;
  padding: 0;
}

/* Wide figures break out of measure column */
figure.wide {
  margin-left: -60px;
  margin-right: -60px;
}

@media (max-width: 768px) {
  figure { margin: 32px 0; }
  figure.wide { margin-left: 0; margin-right: 0; }
}

/* Figure grid (multi-image rows) */
.figure-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 40px 0;
}

.figure-grid figure {
  margin: 0;
}

.figure-grid figcaption {
  font-size: 12px;
  margin-top: 10px;
  padding: 0 4px;
}

@media (max-width: 768px) {
  .figure-grid { grid-template-columns: 1fr; gap: 12px; }
}

/* ============================================================ */
/* Code blocks                                                  */
/* ============================================================ */

pre {
  background: var(--paper-warm);
  border-left: 2px solid var(--ink-soft);
  padding: 18px 22px;
  margin: 32px 0;
  font-family: 'SF Mono', Menlo, 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
}

p code, li code {
  font-family: 'SF Mono', Menlo, 'Consolas', monospace;
  font-size: 0.88em;
  background: var(--paper-warm);
  padding: 0.1em 0.4em;
  border-radius: 2px;
  color: var(--ink);
}

/* ============================================================ */
/* Lists in article body                                        */
/* ============================================================ */

.section ul,
.section ol {
  margin: 24px 0 28px 0;
  padding-left: 1.6em;
  font-family: var(--serif-sc);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.section ul li,
.section ol li {
  margin-bottom: 10px;
  padding-left: 6px;
}

.section ul li::marker {
  color: var(--accent);
  font-size: 0.9em;
}

.section ol li::marker {
  color: var(--accent);
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 500;
}

/* ============================================================ */
/* Series navigation (links between related articles)           */
/* ============================================================ */

.series-nav {
  margin: 0 auto 60px;
  max-width: var(--measure);
  padding: 24px 28px;
  background: var(--paper-warm);
  border-left: 2px solid var(--accent);
}

.series-nav .series-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.series-nav .series-title {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 16px;
}

.series-nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--serif-sc);
  counter-reset: series;
}

.series-nav ol li {
  counter-increment: series;
  padding: 8px 0 8px 32px;
  border-top: 1px dotted var(--rule);
  font-size: 15px;
  color: var(--ink-soft);
  position: relative;
}

.series-nav ol li:first-child {
  border-top: none;
}

.series-nav ol li::before {
  content: counter(series, lower-roman) ".";
  position: absolute;
  left: 4px;
  font-family: var(--serif-en);
  font-style: italic;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.series-nav ol li a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.series-nav ol li a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.series-nav ol li.current {
  color: var(--accent);
  font-weight: 500;
}

.series-nav ol li.current::after {
  content: ' · 当前';
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
}

/* Article list */
.article-list {
  max-width: var(--measure);
  margin: 0 auto;
  list-style: none;
}

.article-list li {
  border-bottom: 1px solid var(--rule-soft);
  margin-bottom: 0;
}

.article-list li:last-child {
  border-bottom: none;
}

.article-list a {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 32px;
  padding: 36px 0;
  text-decoration: none;
  color: var(--ink);
  transition: padding 0.25s;
}

.article-list a:hover {
  padding-left: 16px;
}

.article-list .item-date {
  flex: 0 0 90px;
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.06em;
  padding-top: 8px;
}

.article-list .item-body {
  flex: 1;
  min-width: 0;
}

.article-list .item-title {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.3;
  color: var(--ink);
  margin-bottom: 10px;
  letter-spacing: 0.01em;
}

.article-list .item-subtitle {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.article-list .item-subtitle .cn {
  font-family: var(--serif-sc);
  font-style: normal;
}

.article-list .item-tags {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.article-list .item-tags span {
  margin-right: 14px;
}

/* Tag page header (filtered list) */
.tag-page-header {
  text-align: center;
  margin-bottom: 60px;
}

.tag-page-header .tag-label {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.tag-page-header h1 {
  font-family: var(--serif-sc);
  font-weight: 500;
  font-size: clamp(32px, 4.5vw, 44px);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.tag-page-header .tag-back {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
}

.tag-page-header .tag-back:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ============================================================ */
/* Responsive                                                   */
/* ============================================================ */

@media (max-width: 768px) {
  html { font-size: 16px; }
  .site-header {
    padding: 20px 24px;
    flex-direction: column;
    gap: 12px;
  }
  .site-nav a { margin: 0 12px; }
  article { padding: 48px 24px 80px; }
  .title-block { margin-bottom: 60px; }
  .section { padding-top: 56px; }
  h2 { margin-bottom: 40px; }
  .pull { padding: 20px 22px; }
  .section > h2 + p::first-letter,
  .section > h2 + p:first-of-type::first-letter {
    font-size: 3.4em;
    margin: 6px 8px 0 0;
  }
  table { font-size: 13px; }
  th, td { padding: 10px 8px 10px 0; }

  .article-nav {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .article-nav .nav-empty { display: none; }
  .article-nav .nav-next { text-align: left; }

  .article-list a {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 28px 0;
  }
  .article-list .item-date {
    padding-top: 0;
    font-size: 12px;
  }
  .index-page { padding: 48px 24px 80px; }
  .index-header { margin-bottom: 60px; }
}

/* ============================================================ */
/* Print                                                        */
/* ============================================================ */

@media print {
  body { background: white; color: black; }
  .site-header, .site-footer, .progress { display: none; }
  article { max-width: 100%; padding: 20px; }
}

::selection {
  background: var(--accent);
  color: var(--paper);
}