/* ==========================================================================
   Meiwen Qi - 计算机体系结构 & 嵌入式硬件工程手记
   纯正古典羊皮纸浸润美学 · 铁胆墨水工匠线描 · 沉稳熟赭红版画压印
   ========================================================================== */

/* 拉丁字体已自托管（消除国内访问 Google CDN 的字体闪换）；
   中文衬线 Noto Serif SC 因 CJK 全字集体积原因仍走 CDN */
@import url('../assets/fonts/fonts.css');
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&display=swap');

.article-prose img { display: block; max-width: 100%; height: auto; margin: 24px auto; }
.article-prose pre { overflow-x: auto; padding: 20px; background: var(--codex-chip-bg); border: 1px dashed var(--codex-border-ink); margin: 24px 0; }
.article-prose code { font-family: Consolas, monospace; font-size: 0.88em; }
.article-prose p { white-space: pre-line; }

:root {
  /* 羊皮纸纸浆与浸润卡片底色 (Parchment & Blended Cards) */
  --codex-parchment-base: #f4ebda;
  --codex-parchment-warm: #ebdcc2;
  --codex-card-bg: rgba(234, 218, 192, 0.58);     /* 半透暖纸色，让羊皮纸纤维与茶渍自然透出 */
  --codex-card-hover: rgba(240, 226, 202, 0.82);  /* 悬停微提亮，柔和不突兀 */
  --codex-chip-bg: rgba(222, 204, 176, 0.42);    /* 标签与小部件微透底 */

  /* 墨水色彩体系 (Iron Gall & Charcoal Ink) */
  --codex-ink-darkest: #22150c;    /* 最深铁胆炭黑，用于主标题与关键线描 */
  --codex-ink-primary: #342114;    /* 核心工程正文墨色 */
  --codex-ink-secondary: #543a26;  /* 次级手记说明文字 */
  --codex-ink-muted: #785b3f;      /* 边注与年代时间 */
  --codex-ink-trace: rgba(68, 46, 28, 0.15); /* 网格基准测量虚线 */

  /* 沉稳风化熟赭红 (Burnt Sanguine) - 沉稳古典，彻底告别刺眼亮红 */
  --codex-sanguine: #7e2d1d;
  --codex-sanguine-hover: #642114;
  --codex-sanguine-light: rgba(126, 45, 29, 0.08);
  --codex-brass: #8f6c2c;
  --codex-brass-light: rgba(143, 108, 44, 0.12);

  /* 墨水渗透线框与版画压印阴影 (Soft Ink Borders & Letterpress) */
  --codex-border-ink: rgba(58, 38, 22, 0.42);     /* 柔和手绘墨线 */
  --codex-border-fine: rgba(72, 48, 30, 0.22);    /* 内嵌辅助细线 */
  --codex-border-dashed: rgba(126, 45, 29, 0.3);

  --codex-shadow-sm: 0 2px 8px rgba(46, 28, 16, 0.06);
  --codex-shadow-paper: 0 4px 18px rgba(46, 28, 16, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  --codex-shadow-inset: inset 0 2px 6px rgba(46, 28, 16, 0.09), inset 0 0 14px rgba(72, 48, 30, 0.05);
  --codex-shadow-btn: 0 2px 6px rgba(46, 28, 16, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.2);

  /* 字体系统 */
  --font-serif-title: "Cinzel", "Noto Serif SC", "Times New Roman", serif;
  --font-serif-body: "EB Garamond", "Noto Serif SC", "Songti SC", serif;
  --font-handwriting: "Caveat", "Italianno", cursive, "KaiTi", serif;

  /* 边角与过渡 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-smooth: 0.25s cubic-bezier(0.2, 0.8, 0.25, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif-body);
  background-color: var(--codex-parchment-base);
  color: var(--codex-ink-primary);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  /* 注入真实羊皮纸纤维纹理 */
  background-image: 
    radial-gradient(ellipse at center, rgba(255, 255, 255, 0.15) 0%, rgba(58, 38, 22, 0.09) 100%),
    url('../assets/images/parchment-texture.jpg');
  background-repeat: repeat;
  background-size: cover;
  background-attachment: fixed;
}

/* 页面四角暗角与手稿岁月沉淀感 */
.ambient-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  box-shadow: inset 0 0 100px rgba(54, 34, 18, 0.2), inset 0 0 160px rgba(40, 24, 14, 0.14);
}

/* 仿手绘素描网格与测量坐标线 */
.ambient-grid-lines {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, var(--codex-ink-trace) 1px, transparent 1px),
    linear-gradient(to bottom, var(--codex-ink-trace) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, black 40%, transparent 85%);
  opacity: 0.45;
}

/* 页面主容器 */
.layout-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   素描手绘矢量图标基础规范 (Hand-Drawn Sketch Icon)
   ========================================================================== */
.sketch-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  stroke: var(--codex-ink-darkest);
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: all var(--transition-smooth);
}

/* 文字行内嵌手绘小图标 */
.sketch-icon-inline {
  vertical-align: -0.3em;
  stroke: var(--codex-sanguine);
  stroke-width: 1.7;
  flex-shrink: 0;
}

/* ==========================================================================
   顶部古卷导航栏 (Manuscript Header & Nav)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 16px;
  z-index: 100;
  margin: 16px auto 0;
  max-width: 1160px;
  padding: 0 24px;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  background: rgba(236, 222, 198, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--codex-border-ink);
  box-shadow: var(--codex-shadow-paper);
  border-radius: var(--radius-sm);
  position: relative;
}

/* 导航栏古典木刻十字角标 */
.nav-wrapper::before,
.nav-wrapper::after {
  content: "✦";
  position: absolute;
  font-size: 10px;
  color: var(--codex-sanguine);
  top: 50%;
  transform: translateY(-50%);
}
.nav-wrapper::before { left: 8px; }
.nav-wrapper::after { right: 8px; }

.site-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  margin-left: 8px;
}

.brand-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  border: 1.2px solid var(--codex-border-ink);
  box-shadow: 0 0 0 1.5px var(--codex-sanguine), var(--codex-shadow-sm);
  background: #fdfaf3;
  flex-shrink: 0;
  position: relative;
}

.brand-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.05) sepia(0.2);
  display: block;
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-title span:first-child {
  font-family: var(--font-serif-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--codex-ink-darkest);
  letter-spacing: 1px;
  white-space: nowrap;
}

.brand-badge {
  font-family: var(--font-handwriting);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--codex-sanguine);
  letter-spacing: 0.5px;
  margin-top: -3px;
  white-space: nowrap;
}

/* 导航链接 */
.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-link {
  font-family: var(--font-serif-title);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--codex-ink-primary);
  text-decoration: none;
  letter-spacing: 0.8px;
  position: relative;
  padding: 4px 2px;
  white-space: nowrap;
  transition: color var(--transition-smooth);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--codex-sanguine);
  transition: width var(--transition-smooth);
}

.nav-link:hover {
  color: var(--codex-sanguine);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 移动端汉堡菜单按钮 (Sketch Hamburger Toggle) */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: var(--codex-chip-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--codex-shadow-sm);
  color: var(--codex-ink-primary);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-smooth);
}

.mobile-menu-btn:hover {
  color: var(--codex-sanguine);
  border-color: var(--codex-sanguine);
}

.mobile-menu-btn[aria-expanded="true"] {
  color: var(--codex-sanguine);
  border-color: var(--codex-sanguine);
  background: var(--codex-sanguine-light);
}

/* 移动端手稿下拉菜单 (Mobile Folio Menu) */
.mobile-menu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 24px;
  right: 24px;
  z-index: 99;
  padding: 10px 20px 18px;
  background: rgba(240, 226, 202, 0.97);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--codex-shadow-paper);
}

.mobile-menu.open {
  display: block;
  animation: mobileMenuIn 0.22s ease;
}

@keyframes mobileMenuIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-menu-links {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.mobile-menu-links li + li {
  border-top: 1px dashed var(--codex-border-fine);
}

.mobile-nav-link {
  display: block;
  padding: 12px 4px;
  font-family: var(--font-serif-title);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--codex-ink-primary);
  text-decoration: none;
  transition: color var(--transition-smooth);
}

.mobile-nav-link:hover {
  color: var(--codex-sanguine);
}

.mobile-menu-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  padding-top: 14px;
  border-top: 1px dashed var(--codex-border-fine);
}

.mobile-menu-actions .btn {
  flex: 1;
  padding: 9px 10px;
  font-size: 0.85rem;
}

/* ==========================================================================
   按钮系统 (Buttons - 沉稳版画压印质感)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-serif-title);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  letter-spacing: 0.8px;
  white-space: nowrap;
  transition: all var(--transition-smooth);
  position: relative;
}

.btn-primary {
  background-color: var(--codex-sanguine);
  color: #fdf8ee;
  border: 1px solid rgba(48, 16, 10, 0.6);
  box-shadow: var(--codex-shadow-btn);
}

.btn-primary:hover {
  background-color: var(--codex-sanguine-hover);
  box-shadow: 0 4px 12px rgba(126, 45, 29, 0.28);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background-color: var(--codex-chip-bg);
  color: var(--codex-ink-primary);
  border: 1px solid var(--codex-border-ink);
  box-shadow: var(--codex-shadow-sm);
}

.btn-secondary:hover {
  background-color: rgba(236, 222, 198, 0.88);
  border-color: var(--codex-sanguine);
  color: var(--codex-sanguine);
  transform: translateY(-1px);
  box-shadow: var(--codex-shadow-paper);
}

.btn-secondary:active {
  transform: translateY(1px);
}

.mode-btn .sketch-icon,
.btn .sketch-icon {
  width: 15px;
  height: 15px;
  stroke: currentColor;
  stroke-width: 1.8;
  vertical-align: middle;
}

/* ==========================================================================
   Hero 首屏板块 (The Codex Workshop Hero)
   ========================================================================== */
.hero-section {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 52px;
  align-items: center;
  padding: 42px 0 64px;
  min-height: 82vh;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 580px;
  /* 适度内敛留白，确保与屏幕左侧装订立绘完全错开避让 */
  padding-left: 16px;
  position: relative;
  z-index: 2;
}

/* 状态胶囊标签 (工程图纸图注印痕) */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border: 1px dashed var(--codex-sanguine);
  border-radius: var(--radius-sm);
  background: var(--codex-sanguine-light);
  font-family: var(--font-handwriting);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--codex-sanguine);
  width: fit-content;
}

.status-dot {
  width: 7px;
  height: 7px;
  background-color: var(--codex-sanguine);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--codex-sanguine);
}

/* 首屏主标题 */
.hero-title {
  font-family: var(--font-serif-title);
  /* 2.55rem 保证首行 13 个全角字符在 580px 标题列内完整不拆词 */
  font-size: 2.55rem;
  font-weight: 800;
  color: var(--codex-ink-darkest);
  line-height: 1.25;
  letter-spacing: 0.5px;
}

.gradient-text {
  color: var(--codex-sanguine);
  position: relative;
  display: inline-block;
  text-decoration: underline;
  text-decoration-color: var(--codex-brass);
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
}

/* 打字机副标题 */
.hero-subtitle {
  font-family: var(--font-handwriting);
  font-size: 1.55rem;
  font-weight: 600;
  color: var(--codex-ink-secondary);
  min-height: 2.2rem;
  display: flex;
  align-items: center;
  letter-spacing: 0.5px;
}

.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1.35em;
  background-color: var(--codex-sanguine);
  margin-left: 4px;
  animation: cursorBlink 0.9s infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-description {
  font-size: 1.12rem;
  color: var(--codex-ink-secondary);
  line-height: 1.8;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}

/* ==========================================================================
/* ==========================================================================
   右侧核心：素描手稿无界交互画卷 (Codex Stage Frameless)
   彻底去控件化：无生硬外壳边框，直拓于古籍羊皮纸上，保留纯粹素描质感与物理联动
   ========================================================================== */
.stage-column {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-width: 0; /* 网格/弹性链条允许收缩，防止画布属性宽撑爆首屏 */
}

.stage-frameless-wrap {
  width: 100%;
  max-width: 520px;
  min-width: 0; /* 弹性子项允许收缩，防止画布属性宽撑爆首屏 */
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 浮动手稿批注气泡（已按要求彻底屏蔽，保持纯粹画卷） */
.character-speech-bubble {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

/* 核心 Canvas 舞台容器：彻底无界透明，直接拓印于羊皮纸之上 */
#codex-canvas-container {
  width: 100%;
  height: 440px;
  background: transparent;
  border: none;
  box-shadow: none;
  position: relative;
  overflow: hidden;
  cursor: crosshair;
}

.codex-canvas {
  width: 100%;
  height: 100%;
  max-width: 100%; /* 允许画布随容器收缩，避免属性宽反向撑大布局（旋转屏/缩窗场景） */
  display: block;
}

/* ==========================================================================
   通用内容板块规范 (Content Sections & Headers)
   ========================================================================== */
.content-section {
  padding: 72px 0;
  position: relative;
}

.content-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 75%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--codex-border-fine), transparent);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.section-tag {
  font-family: var(--font-serif-title);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--codex-sanguine);
  padding: 3px 12px;
  border-bottom: 1.5px solid var(--codex-sanguine);
}

.section-title {
  font-family: var(--font-serif-title);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--codex-ink-darkest);
  letter-spacing: 0.5px;
  /* 窄屏折行时平衡两行长度，避免末尾孤字（仅限纯文本标题，勿加到含 inline-block 子元素的容器） */
  text-wrap: balance;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--codex-ink-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   关于我板块 (About & Technical Skills)
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 36px;
  align-items: stretch;
}

.about-card-left {
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: var(--codex-shadow-paper);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
}

.about-avatar-preview {
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid var(--codex-border-ink);
  border-radius: 2px;
  overflow: hidden;
  background: rgba(228, 212, 186, 0.5);
  /* 墨线卡纸装裱：羊皮纸色内衬 + 朱砂细线，替代生硬白边框 */
  box-shadow:
    inset 0 0 0 5px rgba(244, 235, 218, 0.92),
    inset 0 0 0 6px rgba(126, 45, 29, 0.42),
    var(--codex-shadow-inset);
  position: relative;
}

.about-avatar-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  padding: 8px;
  filter: contrast(1.04) sepia(0.18);
}

.about-bio h3 {
  font-family: var(--font-serif-title);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--codex-ink-darkest);
  margin-bottom: 8px;
}

.about-bio p {
  font-size: 1.02rem;
  color: var(--codex-ink-secondary);
  line-height: 1.75;
}

/* 技能卡片网格 */
.tech-stack-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tech-category-card {
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  box-shadow: var(--codex-shadow-paper);
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  transition: all var(--transition-smooth);
}

.tech-category-card:hover {
  transform: translateY(-2px);
  background: var(--codex-card-hover);
  border-color: rgba(126, 45, 29, 0.55);
  box-shadow: 0 8px 22px rgba(46, 28, 16, 0.11);
}

.category-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--codex-chip-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: inset 0 1px 3px rgba(46, 28, 16, 0.08);
  flex-shrink: 0;
}

.category-icon .sketch-icon {
  width: 26px;
  height: 26px;
}

.tech-category-card:hover .category-icon .sketch-icon {
  stroke: var(--codex-sanguine);
  transform: scale(1.06);
}

.category-title {
  font-family: var(--font-serif-title);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--codex-ink-darkest);
  letter-spacing: 0.5px;
}

.skill-tags-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* 技能标签 (Stamp Seal 印章印痕质感) */
.skill-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-serif-title);
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--codex-chip-bg);
  color: var(--codex-ink-primary);
  border: 1px solid rgba(62, 40, 24, 0.35);
  border-radius: 2px;
  letter-spacing: 0.3px;
  transition: all var(--transition-smooth);
}

.skill-tag:hover {
  background: rgba(126, 45, 29, 0.12);
  color: var(--codex-sanguine);
  border-color: var(--codex-sanguine);
}

/* ==========================================================================
   实战项目展厅 (Projects)
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.project-card {
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: var(--codex-shadow-paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  position: relative;
  transition: all var(--transition-smooth);
}

.project-card:hover {
  transform: translateY(-3px);
  background: var(--codex-card-hover);
  border-color: rgba(126, 45, 29, 0.55);
  box-shadow: 0 10px 24px rgba(46, 28, 16, 0.12);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.project-icon-box {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--codex-chip-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: inset 0 1px 3px rgba(46, 28, 16, 0.08);
}

.project-links {
  display: flex;
  gap: 8px;
}

.icon-btn {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--codex-chip-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  color: var(--codex-ink-darkest);
  text-decoration: none;
  font-weight: bold;
  transition: all var(--transition-smooth);
}

.icon-btn:hover {
  background: var(--codex-sanguine);
  color: #fdf8ee;
  border-color: var(--codex-sanguine);
  transform: translateY(-1px);
}

.project-title {
  font-family: var(--font-serif-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--codex-ink-darkest);
  margin-bottom: 8px;
  line-height: 1.35;
}

.project-desc {
  font-size: 0.98rem;
  color: var(--codex-ink-secondary);
  line-height: 1.68;
}

.project-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px dashed var(--codex-border-fine);
}

/* ==========================================================================
   精选工程手记板块 (Articles)
   ========================================================================== */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-tab-btn {
  padding: 8px 18px;
  font-family: var(--font-serif-title);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--codex-ink-primary);
  background: var(--codex-chip-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-smooth);
}

.filter-tab-btn:hover {
  background: rgba(236, 222, 198, 0.9);
  color: var(--codex-sanguine);
  border-color: var(--codex-sanguine);
}

.filter-tab-btn.active {
  background: var(--codex-sanguine);
  color: #fdf8ee;
  border-color: var(--codex-sanguine);
  box-shadow: var(--codex-shadow-btn);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  padding: 24px;
  box-shadow: var(--codex-shadow-paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-smooth);
  text-decoration: none;
  color: inherit;
}

/* 文章卡片内嵌手绘虚线边框 */
.article-card::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px dashed var(--codex-border-fine);
  pointer-events: none;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(46, 28, 16, 0.12);
  background: var(--codex-card-hover);
  border-color: rgba(126, 45, 29, 0.55);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-family: var(--font-serif-title);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--codex-ink-muted);
}

.article-category-badge {
  color: var(--codex-sanguine);
  font-weight: 800;
  letter-spacing: 0.5px;
}

.article-title {
  font-family: var(--font-serif-title);
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--codex-ink-darkest);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-excerpt {
  font-size: 0.98rem;
  color: var(--codex-ink-secondary);
  line-height: 1.7;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px dashed var(--codex-border-fine);
  font-family: var(--font-serif-title);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--codex-ink-darkest);
}

.read-more-arrow {
  font-size: 1.1rem;
  color: var(--codex-sanguine);
  transition: transform var(--transition-smooth);
}

.article-card:hover .read-more-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   古籍页脚 (Site Footer)
   ========================================================================== */
.site-footer {
  margin-top: 80px;
  padding: 36px 0;
  border-top: 1px solid var(--codex-border-ink);
  background: rgba(230, 214, 186, 0.65);
  box-shadow: inset 0 4px 10px rgba(46, 28, 16, 0.05);
}

/* 宽屏时加高卷末留白，为过渡带③的「羽毛笔与墨水瓶」收尾图解腾出画位 */
@media (min-width: 920px) {
  .site-footer {
    margin-top: 190px;
  }
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-text {
  font-family: var(--font-serif-body);
  font-size: 0.95rem;
  color: var(--codex-ink-secondary);
}

.footer-link {
  font-family: var(--font-serif-title);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--codex-ink-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--codex-sanguine);
  transition: color var(--transition-smooth);
}

.footer-link:hover {
  color: var(--codex-sanguine);
}

/* ==========================================================================
   手记详情页 (Codex Article Reading Page)
   ========================================================================== */
.codex-article {
  max-width: 780px;
  margin: 0 auto;
  padding: 56px 0 16px;
  position: relative;
  z-index: 1;
}

.article-page-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}

.article-page-title {
  font-family: var(--font-serif-title);
  font-size: clamp(1.45rem, 4.5vw, 2.05rem);
  font-weight: 800;
  color: var(--codex-ink-darkest);
  line-height: 1.4;
  letter-spacing: 0.5px;
  text-wrap: balance;
  max-width: 640px;
}

.article-latin-motto {
  font-family: var(--font-serif-title);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--codex-sanguine);
}

.article-page-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif-title);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--codex-ink-muted);
  letter-spacing: 1px;
}

.article-meta-fleuron {
  color: var(--codex-sanguine);
  font-size: 0.7rem;
}

/* 正文：羊皮纸誊写卡，内嵌手绘虚线框 */
.article-prose {
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--codex-shadow-paper);
  padding: 44px 52px;
  position: relative;
}

.article-prose::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed var(--codex-border-fine);
  pointer-events: none;
}

.article-lede {
  font-style: italic;
  color: var(--codex-ink-secondary);
  border-left: 3px solid var(--codex-sanguine);
  background: var(--codex-sanguine-light);
  padding: 10px 16px;
  margin-bottom: 26px !important;
  line-height: 1.8;
}

.article-prose p {
  font-size: 1.05rem;
  color: var(--codex-ink-primary);
  line-height: 1.95;
  margin-bottom: 18px;
  text-align: justify;
}

/* 引言后的第一段首字下沉 */
.article-lede + p::first-letter {
  float: left;
  font-family: var(--font-serif-title);
  font-size: 3.1em;
  font-weight: 800;
  line-height: 0.85;
  padding: 4px 10px 0 0;
  color: var(--codex-sanguine);
}

.article-subtitle {
  font-family: var(--font-serif-title);
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--codex-ink-darkest);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--codex-border-fine);
}

.sketch-list {
  padding-left: 24px;
  margin-bottom: 20px;
}

.sketch-list li {
  font-size: 1.02rem;
  color: var(--codex-ink-primary);
  line-height: 1.9;
  margin-bottom: 8px;
}

.sketch-list li::marker {
  color: var(--codex-sanguine);
}

/* 拉丁文手稿边注 */
.latin-note {
  margin: 32px auto;
  padding: 14px 20px;
  border-top: 1px solid var(--codex-border-ink);
  border-bottom: 1px solid var(--codex-border-ink);
  text-align: center;
  font-family: var(--font-serif-title);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--codex-sanguine);
  background: var(--codex-chip-bg);
}

.latin-note-zh {
  display: block;
  margin-top: 4px;
  font-family: var(--font-handwriting);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--codex-ink-muted);
}

/* 上下篇翻页 */
.article-adjacent {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  max-width: 780px;
  margin: 20px auto 64px;
}

.adjacent-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  background: var(--codex-card-bg);
  border: 1px solid var(--codex-border-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--codex-shadow-sm);
  text-decoration: none;
  transition: all var(--transition-smooth);
}

.adjacent-link:hover {
  border-color: var(--codex-sanguine);
  background: var(--codex-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--codex-shadow-paper);
}

.adjacent-next {
  text-align: right;
  align-items: flex-end;
}

.adjacent-dir {
  font-family: var(--font-handwriting);
  font-size: 1rem;
  font-weight: 700;
  color: var(--codex-sanguine);
}

.adjacent-title {
  font-family: var(--font-serif-title);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--codex-ink-primary);
  line-height: 1.5;
}

/* 缺失手记占位态 */
.article-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  padding: 96px 0;
}

.article-placeholder-latin {
  font-family: var(--font-serif-title);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--codex-sanguine);
}

/* ==========================================================================
   响应式断点适配 (Responsive Layout)
   ========================================================================== */
@media (max-width: 1024px) {
  /* 中档宽度收紧导航间距，避免链接与按钮文字换行 */
  .nav-links {
    gap: 16px;
  }

  .nav-actions {
    gap: 8px;
  }

  .nav-actions .btn {
    padding: 8px 12px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 36px 0;
  }

  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  /* 顶栏动作按钮收进汉堡菜单，避免窄屏溢出裁切 */
  .nav-actions {
    display: none;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-wrapper {
    padding: 10px 14px;
  }

  .site-brand {
    gap: 10px;
    margin-left: 4px;
    min-width: 0;
  }

  .brand-avatar {
    width: 38px;
    height: 38px;
  }

  .brand-title span:first-child {
    font-size: 1.05rem;
  }

  .brand-badge {
    font-size: 0.85rem;
  }

  .hero-title {
    /* 窄屏线性缩放：320px 小屏也保证朱红短语单行完整、无孤字 */
    font-size: clamp(1.75rem, 8.6vw, 2.2rem);
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .tech-stack-cards {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  /* 手记详情页顶栏按钮在窄屏保留（返回入口不可藏进无人点击的区域） */
  .article-topbar-actions {
    display: flex;
  }

  .article-topbar-actions .btn {
    padding: 7px 10px;
    font-size: 0.78rem;
  }

  /* 390px 级窄屏隐藏"首页"入口：品牌头像本身链回首页，避免按钮压住品牌徽标 */
  .article-topbar-actions .article-home-link {
    display: none;
  }

  .article-prose {
    padding: 26px 20px;
  }

  .article-adjacent {
    flex-direction: column;
  }
}