:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --ink: #111111;
  --muted: #737373;
  --line: #e5e5e5;
  --accent: #f04a00;
  --accent-ink: #ffffff;
  --header-bg: rgba(250, 250, 250, 0.85);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.05);
}

html[data-theme="dark"] {
  --bg: #0a0a0a;
  --surface: #111111;
  --ink: #f5f5f5;
  --muted: #8a8a8a;
  --line: #262626;
  --accent: #ff5c21;
  --accent-ink: #0a0a0a;
  --header-bg: rgba(10, 10, 10, 0.85);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  transition: background 0.3s, color 0.3s;
}

.container { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
}

.brand {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-decoration: none;
}

.brand-dot { color: var(--accent); }

.nav { display: flex; gap: 0; font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace; }

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 10px 14px;
  border-radius: 6px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: color 0.2s, background 0.2s;
}

.nav a::before { content: ""; }

.nav a:hover { color: var(--ink); background: var(--surface); }
.nav a.active { color: var(--ink); padding-left: 12px; position: relative; }
.nav a.active::before { content: "> "; color: var(--accent); position: absolute; left: 2px; }

.theme-toggle {
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  color: var(--ink);
  transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover { background: var(--surface); border-color: var(--muted); }

.header-tools { display: flex; gap: 8px; align-items: center; }

.lang-toggle {
  background: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.lang-toggle:hover { background: var(--surface); border-color: var(--accent); color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  padding: 88px 0 56px;
}

.hero-kicker {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.hero-kicker .prompt { color: var(--accent); }

.hero-name {
  font-size: clamp(36px, 8vw, 64px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  max-width: 640px;
}

.accent-dot { color: var(--accent); }

.hero-desc {
  max-width: 560px;
  color: var(--muted);
  font-size: 16px;
  margin-bottom: 12px;
}

.hero-status {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 32px;
}

.hero-status b { color: var(--ink); font-weight: 600; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, color 0.18s;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--ink);
  color: var(--bg);
}

.btn-primary:hover { box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18); }

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
}

.btn-ghost:hover { border-color: var(--muted); box-shadow: var(--shadow); }

/* ---------- metrics: status bar ---------- */
.metrics {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}

.status-line {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 13px;
  color: var(--ink);
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-wrap: break-word;
  line-height: 2;
}

.status-line .c { color: var(--muted); }
.status-line .v { color: var(--ink); }
.status-line .a { color: var(--accent); }

/* ---------- sections ---------- */
.section { padding: 72px 0; }

.section-alt { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { margin-bottom: 40px; }

.section-label {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.section-sub {
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- projects ---------- */
.project-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 24px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  transition: transform 0.25s;
}

.project-row:last-child { border-bottom: 1px solid var(--line); }
.project-row:hover { transform: translateX(4px); }

.p-num {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  padding-top: 4px;
}

.p-num .px {
  display: block;
  font-size: 11px;
  color: var(--accent);
  font-weight: 400;
  margin-top: 4px;
}

.p-main h3 {
  font-size: 21px;
  font-weight: 700;
  margin-bottom: 2px;
}

.p-en { color: var(--muted); font-weight: 500; font-size: 14px; }

.p-tagline {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.p-desc {
  color: var(--ink);
  font-size: 15px;
  max-width: 620px;
  margin-bottom: 14px;
}

.p-value {
  color: var(--accent);
  font-size: 14.5px;
  font-weight: 600;
  margin-bottom: 14px;
}

.p-more { max-width: 620px; }

.p-more summary {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  padding: 6px 0;
  border-bottom: 1px dashed var(--line);
  transition: color 0.2s;
}

.p-more summary:hover { color: var(--accent); }

.p-more[open] summary { color: var(--accent); }

.p-more .p-tags { margin: 12px 0; }

.p-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }

.p-tags span {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 11.5px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--muted);
  transition: border-color 0.2s, color 0.2s;
}

.project-row:hover .p-tags span { border-color: var(--accent); color: var(--ink); }

.p-link {
  display: inline-block;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--accent);
  transition: color 0.2s;
}

.p-link:hover { color: var(--accent); }

.p-alt { grid-template-columns: 1fr 96px; }
.p-alt .p-num { order: 2; text-align: right; }
.p-alt .p-main { order: 1; }
.p-alt .p-tagline { text-align: right; }

/* ---------- writing ---------- */
.post-list { display: flex; flex-direction: column; }

.post-item {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 17px 4px;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.2s;
}

.post-item:hover { padding-left: 12px; }
.post-item:hover .post-title { text-decoration: underline; text-underline-offset: 4px; }

.post-no {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 13px;
  color: var(--muted);
}

.post-title { font-size: 15.5px; font-weight: 500; }

.post-item time {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 12px;
  color: var(--muted);
}

.more-link { margin-top: 28px; }
.more-link a {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  color: var(--ink); text-decoration: underline; text-underline-offset: 4px;
  text-decoration-color: var(--accent);
  font-size: 13px; font-weight: 600;
}
.more-link a:hover { color: var(--accent); }

/* ---------- about / identity ---------- */
.about-wrap {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 52px;
  align-items: start;
}

.id-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px 22px;
  text-align: center;
  background: var(--bg);
  box-shadow: var(--shadow);
}

.id-avatar {
  width: 104px;
  height: 104px;
  border-radius: 50%;
  margin-bottom: 14px;
  border: 2px solid var(--line);
}

.id-name { font-size: 19px; font-weight: 700; margin-bottom: 2px; }

.id-role { color: var(--muted); font-size: 13.5px; margin-bottom: 4px; }

.id-loc {
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  margin-bottom: 18px;
}

.id-links { display: flex; gap: 8px; justify-content: center; }

.id-links a {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  transition: border-color 0.2s, color 0.2s;
}

.id-links a:hover { border-color: var(--accent); color: var(--accent); }

.about-body p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 14px;
}

.cert-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; align-items: center; }

.cert-group {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-right: 4px;
}

.tag {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 11.5px;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--line);
  color: var(--muted);
}

/* ---------- contact ---------- */
.contact-line {
  display: block;
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s, padding-left 0.2s;
}

.contact-line:hover { color: var(--accent); padding-left: 10px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 30px 0;
  text-align: center;
  color: var(--muted);
  font-size: 12.5px;
}

.site-footer .mono {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  display: block;
  margin-top: 6px;
  font-size: 11.5px;
  letter-spacing: 0.02em;
}

/* ---------- blog list page ---------- */
.page-head { padding: 64px 0 20px; }

.page-head h1 { font-size: clamp(32px, 6vw, 46px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 8px; }

.empty-tip { text-align: center; color: var(--muted); font-size: 14px; margin-top: 28px; }

/* ---------- post page ---------- */
.post { padding: 64px 0 72px; }

.post-head { margin-bottom: 32px; }

.post-head h1 { font-size: clamp(24px, 4vw, 32px); font-weight: 800; line-height: 1.4; margin-bottom: 14px; }

.post-meta {
  display: flex; gap: 10px; color: var(--muted); font-size: 13px;
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
}

.post-body { font-size: 15.5px; }

.post-body h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 34px 0 14px;
}

.post-body p { margin: 0 0 16px; color: var(--muted); }
.post-body h2, .post-body li { color: var(--ink); }

.post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 24px; }
.post-body li { margin-bottom: 6px; }

.post-body code {
  font-family: "SF Mono", "JetBrains Mono", Consolas, monospace;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.88em;
}

.post-back { margin-top: 44px; }
.post-back a {
  font-family: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  color: var(--ink); text-decoration: underline; text-underline-offset: 4px;
  text-decoration-color: var(--accent);
  font-size: 13px; font-weight: 600;
}
.post-back a:hover { color: var(--accent); }

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .about-wrap { grid-template-columns: 1fr; gap: 32px; }
  .project-row { grid-template-columns: 44px 1fr; gap: 12px; }
  .project-row .p-main { order: 2; }
  .p-alt { grid-template-columns: 44px 1fr; }
  .p-alt .p-num { order: 1; text-align: left; }
  .p-alt .p-main { order: 2; }
  .p-alt .p-tagline { text-align: left; }
  .post-item { grid-template-columns: 40px 1fr; }
  .post-item time { grid-column: 2; }
  .hero { padding: 64px 0 40px; }
  .section { padding: 52px 0; }
  .nav { gap: 0; }
  .nav a { padding: 6px 8px; font-size: 12px; min-height: 36px; display: inline-flex; align-items: center; }
}