/* ============================================================
   Palemoky · Landing page
   素雅 / 简约 · 去装饰 · 自动暗亮切换
   ============================================================ */

:root {
  /* 亮色（默认）—— 暖白底、墨色字 */
  --bg: #faf9f7;
  --fg: #1f1d1b;
  --fg-muted: #76726c;
  --fg-faint: #a8a39c;
  --border: #eae7e1;
  --border-strong: #d9d5cd;
  --hover: rgba(0, 0, 0, 0.025);
  --card-bg: rgba(0, 0, 0, 0.012);

  --maxw: 920px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    "Songti SC", "STSong", serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161513;
    --fg: #ece9e4;
    --fg-muted: #908b83;
    --fg-faint: #5d5953;
    --border: #2a2825;
    --border-strong: #3a3733;
    --hover: rgba(255, 255, 255, 0.03);
    --card-bg: rgba(255, 255, 255, 0.02);
  }
}

:root[data-theme="dark"] {
  --bg: #161513;
  --fg: #ece9e4;
  --fg-muted: #908b83;
  --fg-faint: #5d5953;
  --border: #2a2825;
  --border-strong: #3a3733;
  --hover: rgba(255, 255, 255, 0.03);
  --card-bg: rgba(255, 255, 255, 0.02);
}

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

/* JS 用 hidden 属性隐藏空区块；防止被 display:flex/grid 覆盖 */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

a { color: inherit; text-decoration: none; }

/* ---------- 导航 ---------- */
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 28px 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.nav__right {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 社交：右上角导航中的低饱和图标 */
.social { list-style: none; display: flex; align-items: center; }
.social a {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--fg-faint);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.social a:hover { color: var(--fg); background: var(--hover); }
.social svg { width: 17px; height: 17px; }

.lang-toggle {
  min-width: 34px;
  height: 34px;
  padding: 0 6px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  border: none;
  background: transparent;
  color: var(--fg-faint);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.lang-toggle:hover { color: var(--fg); background: var(--hover); }

.theme-toggle {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--fg-faint);
  cursor: pointer;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.theme-toggle:hover { color: var(--fg); background: var(--hover); }
.theme-toggle svg { width: 17px; height: 17px; }

/* ---------- 布局 ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

.section { padding: 44px 0 52px; }
.section + .section { border-top: 1px solid var(--border); }

.section__title {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
  margin-bottom: 26px;
}

.section__intro {
  color: var(--fg-muted);
  margin-bottom: 28px;
}

/* 入场：极轻微的淡入 */
.reveal { opacity: 0; transform: translateY(8px); }
.reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 首屏 ---------- */
.hero { padding: 40px 0 8px; }

.hero__badge {
  font-size: 0.92rem;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.hero__name {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 6vw, 3.2rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero__tagline {
  font-size: 1.15rem;
  color: var(--fg);
  margin-bottom: 16px;
}

.hero__bio {
  color: var(--fg-muted);
  margin-bottom: 22px;
}
/* 简介为首屏最后一个元素时（无按钮/社交），去掉多余下边距 */
.hero__bio:last-child { margin-bottom: 0; }

/* 首屏技能：分类 + 条目的两列对齐列表 */
.hero__skills {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 7px 20px;
  font-size: 0.88rem;
}
.hero__skills dt { color: var(--fg-faint); }
.hero__skills dd { color: var(--fg-muted); }
.hero__skills-sep { margin: 0 9px; color: var(--fg-faint); }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 30px;
}

/* 行动入口：克制的文字链接 */
.btn {
  font-size: 0.95rem;
  color: var(--fg-muted);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.btn:hover { color: var(--fg); border-bottom-color: var(--border-strong); }
.btn--primary { color: var(--fg); border-bottom-color: var(--fg); }
.btn--primary:hover { border-bottom-color: var(--fg); }

/* ---------- 分组卡片（笔记 / 开源项目 / 小玩具） ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: start;
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card-bg);
  padding: 24px 22px 12px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }

.card__title {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--fg-faint);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.card__icon { font-size: 0.95rem; }

.card__item {
  display: block;
  padding: 13px 0;
  border-top: 1px solid var(--border);
}
.card__item:first-of-type { border-top: none; }

.card__name {
  font-size: 1rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.card__arrow {
  color: var(--fg-faint);
  opacity: 0;
  transform: translate(-3px, 0);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}
.card__item:hover .card__arrow { opacity: 1; transform: none; }
.card__desc {
  display: block;
  font-size: 0.88rem;
  color: var(--fg-muted);
  margin-top: 2px;
}

/* ---------- 赞助 ---------- */
.sponsor { display: flex; flex-wrap: wrap; gap: 32px; }
.sponsor__item { text-align: center; }
.sponsor__item img {
  width: 156px;
  height: 156px;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  padding: 8px;
  border: 1px solid var(--border);
}
.sponsor__item span {
  display: block;
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--fg-muted);
}

/* ---------- 页脚 ---------- */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 28px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--fg-faint);
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .hero { padding: 28px 0 4px; }
  .section { padding: 32px 0 40px; }
  .grid { grid-template-columns: 1fr; gap: 16px; }
  .sponsor { gap: 24px; justify-content: center; }
}