/* ============================================================
   CSS 变量 — 修改这里可以全局换色
   ============================================================ */
:root {
  --bg:          #FAF9F6;   /* 主背景：暖奶油白 */
  --bg-alt:      #F2EDE4;   /* 交替区块背景 */
  --bg-card:     #FFFFFF;   /* 卡片背景 */
  --text:        #2A2926;   /* 主文字 */
  --text-2:      #645F58;   /* 次要文字 */
  --text-3:      #9B968F;   /* 浅色文字 */
  --accent:      #7A9E7E;   /* 主强调色：鼠尾草绿 */
  --accent-dk:   #5D7E62;   /* 深一点的强调色 */
  --accent-bg:   #EDF4EE;   /* 强调色背景 */
  --border:      #E3DDD3;   /* 边框 */
  --border-lt:   #EDE9E1;   /* 浅边框 */
  --shadow:      0 2px 12px rgba(0,0,0,0.055);
  --shadow-hov:  0 6px 24px rgba(0,0,0,0.10);
  --radius:      12px;
  --radius-sm:   6px;
  --max-w:       1000px;
  --nav-h:       64px;
  --font:        -apple-system, 'PingFang SC', 'Hiragino Sans GB',
                 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
}

a { color: var(--accent-dk); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ============================================================
   布局工具
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.section      { padding: 84px 0; }
.section-alt  { background: var(--bg-alt); }

/* 网格 */
.grid   { display: grid; gap: 24px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

/* ============================================================
   区块标题组
   ============================================================ */
.section-header   { margin-bottom: 48px; }

.section-tag {
  display: inline-block;
  position: relative;
  padding-left: 14px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent-dk);
  margin-bottom: 10px;
  line-height: 1;
}
.section-tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 12px;
  background: var(--accent);
  border-radius: 2px;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--text);
  margin-bottom: 10px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.85;
  max-width: 560px;
}

.section-note {
  font-size: 0.85rem;
  color: var(--text-3);
  margin-top: 8px;
}

/* ============================================================
   导航
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(250, 249, 246, 0.93);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-lt);
  transition: box-shadow .3s;
}
.site-header.scrolled { box-shadow: 0 2px 16px rgba(0,0,0,0.07); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.site-brand {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
  transition: color .2s;
}
.site-brand:hover { color: var(--accent-dk); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
  transition: color .2s;
  position: relative;
  padding-bottom: 2px;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform .2s;
}
.nav-link:hover { color: var(--accent-dk); }
.nav-link:hover::after { transform: scaleX(1); }

/* 汉堡按钮 */
.menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: background .2s;
}
.menu-btn:hover { background: var(--bg-alt); }

.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all .28s ease;
}

/* 汉堡 → X 动画 */
.menu-btn.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-btn.open span:nth-child(2) { opacity: 0; transform: translateX(-6px); }
.menu-btn.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================================
   首屏 Hero
   ============================================================ */
.hero-section {
  padding-top: calc(var(--nav-h) + 72px);
  padding-bottom: 88px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-inner { max-width: 700px; }

.hero-eyebrow {
  display: block;
  font-size: 0.78rem;
  color: var(--text-3);
  letter-spacing: 0.12em;
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--text);
  margin-bottom: 18px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--accent-dk);
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 28px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-2);
  line-height: 2.1;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .22s;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dk);
  border-color: var(--accent-dk);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(122,158,126,.28);
}

.btn-outline {
  background: transparent;
  color: var(--accent-dk);
  border-color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-bg);
  color: var(--accent-dk);
  transform: translateY(-2px);
}

/* ============================================================
   方向卡片
   ============================================================ */
.dir-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid var(--border-lt);
  box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.dir-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hov);
}

.dir-icon   { font-size: 1.75rem; margin-bottom: 14px; }
.dir-title  { font-size: 1rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.dir-desc   { font-size: 0.875rem; color: var(--text-2); line-height: 1.85; }

/* ============================================================
   作品卡片
   ============================================================ */
.work-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px 22px;
  border: 1px solid var(--border-lt);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform .25s, box-shadow .25s;
}
.work-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hov);
}

.work-title  { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 10px; line-height: 1.5; }
.work-desc   { font-size: 0.875rem; color: var(--text-2); line-height: 1.85; flex: 1; margin-bottom: 20px; }
.work-footer { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============================================================
   标签 Pills
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 11px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}
.tag-type      { background: #F0EDE7; color: #6A6258; }
.tag-done      { background: #E8F4E9; color: #3D7A43; }
.tag-ongoing   { background: #E6EFF9; color: #2B6EAA; }
.tag-exploring { background: #FAF0E4; color: #9A6B1E; }

/* ============================================================
   正在做的东西
   ============================================================ */
.cur-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: border-color .25s, transform .25s;
}
.cur-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--accent);
  opacity: .55;
  border-radius: 0 2px 2px 0;
}
.cur-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.cur-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.cur-desc  { font-size: 0.875rem; color: var(--text-2); line-height: 1.85; }

.cur-note {
  margin-top: 40px;
  padding: 24px 28px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cur-note p {
  font-size: 0.95rem;
  color: var(--text-2);
  line-height: 1.85;
}

/* ============================================================
   文章精选
   ============================================================ */
.art-group {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 26px 24px;
  border: 1px solid var(--border-lt);
  box-shadow: var(--shadow);
}

.art-group-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-lt);
}

.art-list { display: flex; flex-direction: column; }

.art-item {
  font-size: 0.875rem;
  color: var(--text-2);
  padding: 9px 0;
  border-bottom: 1px solid var(--border-lt);
  display: flex;
  align-items: center;
  gap: 8px;
  line-height: 1.5;
}
.art-item:last-child { border-bottom: none; }
.art-item::before {
  content: '·';
  color: var(--accent);
  font-size: 1.3rem;
  line-height: 1;
  flex-shrink: 0;
}

/* ============================================================
   关于我
   ============================================================ */
.about-body {
  max-width: 680px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.about-body p       { font-size: 1rem; color: var(--text-2); line-height: 2.05; }
.about-lead         { font-size: 1.15rem !important; font-weight: 700; color: var(--text) !important; }

/* ============================================================
   联系我
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 680px;
}

.con-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px 22px;
  border: 1px solid var(--border-lt);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color .2s;
}
.con-item:hover { border-color: var(--accent); }
.con-wide       { grid-column: 1 / -1; }

.con-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: var(--text-3);
  text-transform: uppercase;
}
.con-value {
  font-size: 0.95rem;
  color: var(--text-2);
  font-weight: 500;
}
.con-link { color: var(--accent-dk); }
.con-link:hover { color: var(--accent); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 44px 0;
}
.footer-inner { text-align: center; }
.footer-name  { font-size: 1rem; font-weight: 800; color: var(--text); margin-bottom: 6px; }
.footer-desc  { font-size: 0.85rem; color: var(--text-3); margin-bottom: 16px; }
.footer-copy  { font-size: 0.78rem; color: var(--text-3); }

/* ============================================================
   响应式 — 平板 (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   响应式 — 手机 (≤ 640px)
   ============================================================ */
@media (max-width: 640px) {
  body { font-size: 15px; }

  .section         { padding: 60px 0; }
  .section-header  { margin-bottom: 32px; }
  .section-title   { font-size: 1.45rem; }
  .container       { padding: 0 18px; }

  /* 导航 */
  .menu-btn { display: flex; }

  .site-nav {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 10px;
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform .3s ease, opacity .3s ease;
    box-shadow: 0 8px 28px rgba(0,0,0,0.09);
    z-index: 900;
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-link {
    padding: 13px 22px;
    border-bottom: 1px solid var(--border-lt);
    font-size: 1rem;
  }
  .nav-link:last-child { border-bottom: none; }
  .nav-link::after     { display: none; }

  /* Hero */
  .hero-section {
    padding-top: calc(var(--nav-h) + 44px);
    padding-bottom: 60px;
    min-height: auto;
    align-items: flex-start;
  }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; }

  /* 网格全部单列 */
  .grid-4,
  .grid-3,
  .grid-2 { grid-template-columns: 1fr; }

  /* 联系我 */
  .contact-grid { grid-template-columns: 1fr; }
  .con-wide { grid-column: 1; }
}

/* ============================================================
   ★ 增量扩展：小程序卡片 + 文章链接支持
   ============================================================ */

/* ---------- 小程序卡片（.work-mini 叠加在 .work-card 上） ---------- */
.work-mini { gap: 12px; }

.work-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 0 4px;
}

.qr-ph {
  width: 120px;
  height: 120px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  font-size: .8rem;
  text-align: center;
  line-height: 1.6;
}

.qr-img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  object-fit: cover;
}

.qr-hint {
  font-size: .78rem;
  color: var(--text-3);
  margin: 0;
}

.work-mini-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.wl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: .84rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: opacity .18s;
  line-height: 1;
}

.wl-btn--primary {
  background: var(--accent);
  color: #fff;
}
.wl-btn--primary:hover { opacity: .85; }

.wl-btn--muted {
  background: var(--bg-alt);
  color: var(--text-3);
  cursor: default;
  border: 1px solid var(--border);
}

/* ---------- 文章精选：标题 span + 状态标签 ---------- */
.art-title { flex: 1; }

a.art-title {
  color: var(--text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s, color .18s;
}
a.art-title:hover {
  color: var(--accent-dk);
  border-bottom-color: var(--accent);
}

.art-pending {
  font-size: .7rem;
  color: var(--text-3);
  white-space: nowrap;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--bg-alt);
  border: 1px solid var(--border-lt);
  flex-shrink: 0;
}

.art-ext {
  font-size: .7rem;
  color: var(--accent-dk);
  white-space: nowrap;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid currentColor;
  flex-shrink: 0;
  text-decoration: none;
}
.art-ext:hover { opacity: .75; }

@media (max-width: 640px) {
  .work-mini-btns { justify-content: center; }
}

/* ============================================================
   AI 小项目体验室
   ============================================================ */

.mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .9rem;
  transition: box-shadow .25s, transform .25s;
}
.mini-card:hover {
  box-shadow: var(--shadow-hov);
  transform: translateY(-3px);
}

.mini-icon {
  font-size: 2rem;
  line-height: 1;
}

.mini-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: .45rem;
}

.mini-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.mini-desc {
  font-size: .88rem;
  color: var(--text-2);
  line-height: 1.65;
}

.mini-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .25rem;
}

.mini-footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding-top: .75rem;
  border-top: 1px solid var(--border-lt);
}

.mini-btn {
  display: inline-block;
  padding: .48rem 1.1rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background .2s, transform .15s;
  white-space: nowrap;
  align-self: flex-end;
}
.mini-btn--soon {
  background: var(--bg-alt);
  color: var(--text-3);
  cursor: default;
  pointer-events: none;
}
.mini-btn:hover {
  background: var(--accent-dk);
  color: #fff;
  transform: translateX(2px);
}

.mini-qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .25rem;
}

.mini-qr {
  width: 88px;
  height: 88px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.mini-qr-tip {
  font-size: .68rem;
  color: var(--text-3);
  text-align: center;
}

/* 部署提示条 */
.mini-deploy-note {
  display: none;
  align-items: center;
  gap: .6rem;
  margin-top: 2rem;
  padding: .75rem 1.25rem;
  background: var(--accent-bg);
  border: 1px solid #c4d9c6;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--accent-dk);
}
.mini-deploy-icon { font-size: 1.1rem; }

@media (max-width: 640px) {
  .mini-footer {
    flex-direction: column;
    align-items: stretch;
  }
  .mini-btn {
    text-align: center;
  }
  .mini-qr-wrap {
    flex-direction: row;
    justify-content: flex-start;
    gap: .75rem;
  }
  .mini-qr-tip {
    font-size: .75rem;
  }
}

/* 作品卡片内联跳转按钮 */
.work-link {
  display: inline-block;
  margin-left: auto;
  padding: .28rem .75rem;
  font-size: .78rem;
  font-weight: 600;
  color: var(--accent-dk);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: background .2s, color .2s;
}
.work-link:hover {
  background: var(--accent);
  color: #fff;
}

/* ============================================================
   文章区：新结构（含简介 + 按钮）
   ============================================================ */
.art-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem 0;
  border-bottom: 1px solid var(--border-lt);
}
.art-item:last-child { border-bottom: none; }

.art-content {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  flex: 1;
  min-width: 0;
}

.art-title {
  font-size: .93rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
}

.art-brief {
  font-size: .8rem;
  color: var(--text-3);
  line-height: 1.6;
}

/* 有链接时用这个按钮 */
.art-read-btn {
  flex-shrink: 0;
  font-size: .78rem;
  font-weight: 600;
  color: var(--accent-dk);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 3px 10px;
  text-decoration: none;
  white-space: nowrap;
  transition: background .2s, color .2s;
}
.art-read-btn:hover {
  background: var(--accent);
  color: #fff;
}

/* 没有链接时用这个 */
.art-soon {
  flex-shrink: 0;
  font-size: .72rem;
  color: var(--text-3);
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--bg-alt);
  border: 1px solid var(--border-lt);
  white-space: nowrap;
}

/* ============================================================
   AI 小项目体验室：分类标题 + 说明段
   ============================================================ */
.mini-intro {
  font-size: .93rem;
  color: var(--text-2);
  line-height: 1.9;
  max-width: 700px;
  margin: 0 auto 2.5rem;
  text-align: center;
}

.mini-cat {
  margin-bottom: 2.75rem;
}
.mini-cat:last-of-type { margin-bottom: 0; }

.mini-cat-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.1rem;
  padding-left: .75rem;
  border-left: 3px solid var(--accent);
}

/* 小项目卡片去掉 mini-tags（已删除） */

/* ============================================================
   联系区：交流引导语
   ============================================================ */
.contact-invite {
  font-size: .93rem;
  color: var(--text-2);
  line-height: 1.8;
  max-width: 560px;
  margin: .75rem auto 0;
  font-style: italic;
}