:root {
  --bg: #0a0f14;
  --surface: #10161d;
  --surface-2: #141c25;
  --border: #1f2a35;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #4ade80;
  --mono: ui-monospace, "Cascadia Code", Consolas, "JetBrains Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(139, 152, 165, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 152, 165, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 35%, transparent 100%);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- terminal hero ---------- */

.hero { position: relative; padding: 72px 20px 40px; }

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}

.hero::before {
  width: 420px;
  height: 260px;
  left: calc(50% - 330px);
  top: -30px;
  background: radial-gradient(closest-side, rgba(74, 222, 128, 0.16), transparent);
  animation: drift 16s ease-in-out infinite alternate;
}

.hero::after {
  width: 380px;
  height: 240px;
  right: calc(50% - 310px);
  top: 60px;
  background: radial-gradient(closest-side, rgba(34, 211, 238, 0.13), transparent);
  animation: drift 20s ease-in-out infinite alternate-reverse;
}

@keyframes drift {
  from { transform: translate3d(-24px, 8px, 0) scale(1); }
  to { transform: translate3d(24px, -12px, 0) scale(1.08); }
}

.terminal {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid #24354a;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.15s ease-out;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.05),
    0 24px 70px rgba(0, 0, 0, 0.55),
    0 0 90px rgba(74, 222, 128, 0.07);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: linear-gradient(180deg, #16202b, #121a23);
  border-bottom: 1px solid var(--border);
}

.dot { width: 12px; height: 12px; border-radius: 50%; box-shadow: inset 0 -1px 1px rgba(0, 0, 0, 0.25); }
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.term-title {
  flex: 1;
  margin: 0 10px;
  text-align: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.win-btns { display: flex; gap: 10px; }

.win-btns span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  opacity: 0.65;
  line-height: 1;
}

.terminal-body {
  position: relative;
  padding: 20px 20px 24px;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 2.05;
  background: linear-gradient(180deg, rgba(74, 222, 128, 0.035), transparent 140px);
}

.terminal-body::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 3px);
}

.prompt { color: var(--accent); margin-right: 8px; text-shadow: 0 0 12px rgba(74, 222, 128, 0.45); }
.cmd { color: var(--text); }
.out { color: var(--text); }
.out.muted { color: var(--muted); }
.banner { color: var(--muted); opacity: 0.85; }
.s-verb { color: #67e8f9; }
.s-op { color: #f472b6; }
.s-flag { color: #fbbf24; }

.tree-root { color: var(--muted); }
.tree-branch { color: #46535f; }
.tree-parent { color: #46535f; }

.tree-leaf {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: inherit;
  color: var(--text);
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  transition: color 0.15s ease;
}

.tree-leaf svg { width: 13px; height: 13px; flex: none; color: var(--muted); }
.tree-leaf:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.tree-leaf:hover svg { color: var(--accent); }

.tree-summary { color: var(--muted); }

.terminal-body.pre .tw-line { display: none; }
.terminal-body.pre .tw-line.show { display: block; }

.cursor {
  display: inline-block;
  width: 8px;
  height: 1.05em;
  margin-left: 1px;
  background: var(--accent);
  vertical-align: text-bottom;
  box-shadow: 0 0 10px rgba(74, 222, 128, 0.7);
  animation: blink 1.05s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

.terminal-status {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 7px 14px;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
}

.terminal-status .st.accent { color: var(--accent); }
.terminal-status .st-spacer { flex: 1; }

/* ---------- toolbar ---------- */

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.filters { display: flex; flex-wrap: wrap; gap: 8px; }

.filter {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 16px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.filter:hover { color: var(--text); border-color: var(--muted); }

.filter.active {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

.stats {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- project grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: linear-gradient(180deg, #121a23, var(--surface));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 20px 16px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  animation: fadeUp 0.4s ease both;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cat, var(--accent)), transparent 75%);
  opacity: 0.3;
  transition: opacity 0.25s ease;
}

.card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in srgb, var(--cat, var(--accent)) 9%, transparent), transparent 70%);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--cat, var(--accent)) 45%, var(--border));
  box-shadow:
    0 14px 34px rgba(0, 0, 0, 0.45),
    0 0 26px color-mix(in srgb, var(--cat, var(--accent)) 14%, transparent);
}

.card:hover::before { opacity: 0.9; }
.card:hover::after { opacity: 1; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-top-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.index {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 1px;
  color: var(--muted);
  opacity: 0.55;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 999px;
}

.chip svg { width: 12px; height: 12px; flex: none; }

.star {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.3px;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.24);
  border-radius: 999px;
  padding: 2px 8px 2px 6px;
}

.star svg { width: 11px; height: 11px; flex: none; stroke-width: 1.5; }

.card h2 {
  font-size: 18px;
  font-weight: 650;
  line-height: 1.4;
}

.card:hover h2 { color: var(--cat, var(--accent)); }

.card .desc {
  font-size: 14px;
  color: var(--muted);
  flex: 1;
}

.card-path {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  opacity: 0.8;
  word-break: break-all;
  margin-top: -4px;
}

.card.flash { animation: cardFlash 1.3s ease; }

@keyframes cardFlash {
  0%, 100% { box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45); }
  25% {
    box-shadow:
      0 0 0 2px var(--cat),
      0 0 34px color-mix(in srgb, var(--cat) 30%, transparent);
  }
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.tags li {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
}

.qr {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.qr img {
  width: 92px;
  height: 92px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 0 0 1px var(--border);
}

.qr-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

.qr-label svg { width: 14px; height: 14px; flex: none; color: var(--accent); }

.links {
  display: flex;
  gap: 16px;
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.links a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
}

.links a:hover { text-decoration: underline; }

.empty {
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 14px;
  padding: 60px 0;
}

/* ---------- footer ---------- */

.foot {
  margin-top: 56px;
  border-top: 1px solid var(--border);
}

.foot .wrap {
  padding-top: 28px;
  padding-bottom: 40px;
}

.foot-main {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.foot-logo {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--accent);
  text-shadow: 0 0 10px rgba(74, 222, 128, 0.3);
}

.foot-tag { margin-top: 6px; font-size: 13px; color: var(--muted); }

.notice {
  font-size: 13px;
  color: var(--muted);
}

.foot .notice { margin-top: 24px; }

.notice code {
  font-family: var(--mono);
  color: var(--accent);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}

.notice strong { color: var(--text); }

.foot-links { display: flex; gap: 20px; padding-top: 4px; }

.foot-links a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
}

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

.foot-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
}

.beian { font-family: var(--mono); }

.beian a {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 24px;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
  text-shadow: 0 0 10px rgba(74, 222, 128, 0.3);
}

.nav-links { display: flex; gap: 22px; }

.nav-links a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

/* ---------- sections ---------- */

.section { margin-top: 96px; scroll-margin-top: 64px; }

.section-head { margin-bottom: 28px; }

.sec-title {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 650;
  letter-spacing: 0.5px;
}

.sec-cmt {
  color: var(--accent);
  text-shadow: 0 0 12px rgba(74, 222, 128, 0.35);
  margin-right: 6px;
}

.sec-sub { margin-top: 6px; color: var(--muted); font-size: 14.5px; }

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
}

.about-bio p {
  font-size: 15.5px;
  line-height: 1.9;
  margin-bottom: 14px;
}

.about-bio p:last-child { margin-bottom: 0; }

.side-title {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 14px;
}

.now-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.now-list li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14.5px;
}

.now-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.toolbox { margin-top: 32px; }

.skill-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.skill-group h4 {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 10px;
}

.skill-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.skill-chips span {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 9px;
}

/* ---------- contact ---------- */

.contact-lead { color: var(--muted); font-size: 15px; margin-bottom: 22px; }

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.cc-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex: none;
  color: var(--accent);
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.cc-icon svg { width: 20px; height: 20px; }

.cc-text { display: flex; flex-direction: column; gap: 2px; }

.contact-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.4);
}

.contact-card .cc-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
}

.contact-card .cc-value {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--text);
}

.copyright {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

/* ---------- a11y & responsive ---------- */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

@media (max-width: 640px) {
  .hero { padding-top: 40px; }
  .terminal-body { font-size: 12px; line-height: 1.9; }
  .grid { grid-template-columns: 1fr; }
  .toolbar { flex-direction: column; align-items: flex-start; }
  .nav { padding: 11px 16px; }
  .nav-links { gap: 16px; }
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .section { margin-top: 64px; }
  .tree-parent { display: none; }
}

@media (max-width: 480px) {
  .terminal-status .opt { display: none; }
}