/* ---------- 设计变量 ---------- */
:root {
  --paper: #f7f8f6;
  --surface: #ffffff;
  --ink: #13181a;
  --muted: #5c6663;
  --line: #e0e5e0;
  --accent: #0e7357;
  --accent-ink: #0b5a45;
  --accent-soft: #e8f2ee;
  --radius: 8px;
  --wrap: 1120px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.7 var(--font);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

img { max-width: 100%; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  background: var(--ink);
  color: #fff;
  padding: 8px 14px;
  border-radius: 6px;
  z-index: 50;
}
.skip-link:focus { left: 16px; }

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

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 246, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  font-size: 15px;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
}
.nav > a { color: var(--muted); }
.nav > a:hover { color: var(--ink); text-decoration: none; }

.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
}
.nav-gh:hover { border-color: #c3cfc9; text-decoration: none; }

/* ---------- 首屏 ---------- */
.hero { padding: 52px 0 44px; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: 56px;
  min-height: calc(68svh - 60px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 600;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--accent);
}

h1 {
  margin: 0 0 18px;
  font-size: 64px;
  line-height: 1.04;
  font-weight: 650;
}
.dot { color: var(--accent); }

.lede {
  max-width: 32em;
  margin: 0 0 30px;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font: 600 15px/1.2 var(--font);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }

.btn-ghost {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: #c3cfc9; }

.quick-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
  margin: 0;
}
.quick-facts dt {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 12px;
}
.quick-facts dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}

.hero-panel {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--ink);
  box-shadow: 0 18px 40px -24px rgba(19, 24, 26, 0.55);
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  color: #9fb0ab;
  font: 12px var(--mono);
}

.dot-row { display: inline-flex; gap: 5px; }
.dot-row i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.hero-panel pre {
  margin: 0;
  padding: 18px 20px 22px;
  overflow-x: auto;
  color: #d7e3df;
  font: 13px/1.8 var(--mono);
}
.hero-panel .k { color: #7fd1b9; }
.hero-panel .s { color: #e6c07b; }
.hero-panel .p { color: #8fa39d; }

/* ---------- 通用区块 ---------- */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 76px;
}

.section-head h2 {
  margin: 0 0 8px;
  font-size: 32px;
  line-height: 1.25;
  font-weight: 650;
}
.section-head p {
  max-width: 44em;
  margin: 0 0 40px;
  color: var(--muted);
}

/* ---------- 项目 ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.project {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.project:hover { border-color: #c6d2cd; transform: translateY(-2px); }

.thumb {
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--accent-soft);
}
.thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.project:hover .thumb img { transform: scale(1.02); }

.project-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 10px;
  padding: 20px 22px 22px;
}

.project-body h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 18px;
}

.badge {
  padding: 2px 8px;
  border: 1px solid #cfe4db;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 11px;
  font-weight: 600;
}
.badge--game {
  border-color: #edcfdf;
  background: #fff0f7;
  color: #a1245d;
}
.badge--stack {
  border-color: #cbdcef;
  background: #edf5fd;
  color: #215b8f;
}

.project-body p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 2px 0 0;
  padding: 0;
  list-style: none;
}
.tags li {
  padding: 2px 8px;
  border: 1px solid #e4e9e5;
  border-radius: 4px;
  background: #f1f4f2;
  color: #44534e;
  font: 12px var(--mono);
}

.project-links {
  display: flex;
  gap: 18px;
  margin-top: auto;
  padding-top: 8px;
  font-size: 14px;
  font-weight: 600;
}
.project-links a { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- 技能 ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.skill-col h3 {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.skill-col ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 14.5px;
}
.skill-col li { display: flex; align-items: baseline; gap: 9px; }
.skill-col li::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: #b9c7c1;
}

/* ---------- 联系 ---------- */
.contact {
  padding: 72px 0;
  background: var(--ink);
  color: #fff;
}

.contact-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
}

.contact h2 {
  margin: 0 0 8px;
  font-size: 32px;
  font-weight: 650;
}
.contact p { margin: 0 0 26px; color: #a9b7b2; }

.email-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }

.email {
  color: #fff;
  font-size: 24px;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  padding-bottom: 2px;
}
.email:hover { text-decoration: none; border-color: #fff; }

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 6px;
  background: transparent;
  color: #cfdad6;
  font: 13px var(--font);
  cursor: pointer;
}
.copy-btn:hover { border-color: rgba(255, 255, 255, 0.45); color: #fff; }
.copy-btn.done { border-color: #4f9c82; color: #8fd7bd; }

.contact-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 14px;
  min-width: 260px;
}
.contact-list li {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.contact-list span { color: #8fa39d; }
.contact-list a { color: #fff; }
.contact-list em { font-style: normal; color: #cfdad6; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 26px 0;
  color: #8fa39d;
  font-size: 13px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
}
.footer-inner p { margin: 0; }

/* ---------- Demo 页 ---------- */
.demo-main { padding: 56px 0 96px; }
.demo-wrap { max-width: 760px; }

.demo-main h1 {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1.1;
}

.demo-sub {
  max-width: 40em;
  margin: 0 0 32px;
  color: var(--muted);
}

.task-app {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.task-form {
  display: flex;
  gap: 10px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
  background: #fbfcfb;
}
.task-form input {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font: 15px var(--font);
}
.task-form input::placeholder { color: #9aa5a1; }
.task-form input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px rgba(14, 115, 87, 0.12); }

.task-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
}

.seg {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}
.seg button {
  padding: 5px 13px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 13px var(--font);
  cursor: pointer;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--ink); color: #fff; }

.task-count { margin: 0; color: var(--muted); font-size: 13px; }

.task-list { margin: 0; padding: 0; list-style: none; }

.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
}
.task-item:last-child { border-bottom: 0; }

.task-check {
  flex: none;
  width: 17px;
  height: 17px;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.task-text {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
  cursor: pointer;
  font-size: 15px;
}

.task-item.done .task-text { color: #9aa5a1; text-decoration: line-through; }

.task-del {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: #9aa5a1;
  cursor: pointer;
}
.task-del:hover { background: #fbeceb; color: #b3312a; }

.task-empty {
  margin: 0;
  padding: 44px 18px;
  text-align: center;
  color: #9aa5a1;
  font-size: 14px;
}

.task-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 18px;
  border-top: 1px solid var(--line);
  background: #fbfcfb;
  color: var(--muted);
  font-size: 13px;
}

.link-btn {
  padding: 0;
  border: 0;
  background: none;
  color: var(--muted);
  font: 13px var(--font);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-btn:hover { color: var(--ink); }
.link-btn:disabled { color: #c2cbc7; cursor: default; text-decoration: none; }

.demo-note {
  margin: 22px 0 32px;
  color: var(--muted);
  font-size: 13.5px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .wrap { padding: 0 40px; }
}

@media (max-width: 899px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    min-height: 0;
  }
  .hero-panel { display: none; }
  h1 { font-size: 48px; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 719px) {
  .section { padding: 60px 0; }
  .project-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; gap: 26px; }
  .hero { padding: 40px 0 36px; }
  h1 { font-size: 40px; }
  .lede { font-size: 16px; }
  .section-head h2 { font-size: 26px; }
  .contact { padding: 56px 0; }
  .contact h2 { font-size: 26px; }
  .email { font-size: 21px; }
  .contact-list { min-width: 0; width: 100%; }
  .demo-main { padding: 36px 0 72px; }
  .demo-main h1 { font-size: 32px; }
}

@media (max-width: 639px) {
  .nav > a:not(.nav-gh) { display: none; }
  .quick-facts { gap: 22px; }
  .task-form { flex-wrap: wrap; }
  .task-form .btn { width: 100%; justify-content: center; }
}

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