:root {
  --cream: #f4efe6;
  --paper: #fbf7f0;
  --ink: #1c2a24;
  --ink-soft: #3d4f46;
  --forest: #1f4a3c;
  --moss: #2f6b56;
  --peach: #d9897a;
  --peach-soft: #f3d5cc;
  --line: rgba(31, 74, 60, 0.16);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "Times New Roman", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Helvetica Neue", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  background: var(--paper);
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--forest);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -40px;
  background: var(--forest);
  color: var(--paper);
  padding: 0.4rem 0.8rem;
  z-index: 20;
}

.skip-link:focus {
  top: 0.6rem;
}

.inner {
  width: min(1080px, calc(100% - 2.4rem));
  margin: 0 auto;
}

.narrow {
  width: min(720px, calc(100% - 2.4rem));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 247, 240, 0.96);
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
  flex-shrink: 0;
}

.brand-mark {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--peach);
  box-shadow: 0 0 0 5px rgba(217, 137, 122, 0.18);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-zh {
  font-family: var(--serif);
  font-size: 1.05rem;
}

.brand-en {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font: inherit;
  cursor: pointer;
}

.site-nav {
  display: flex;
  gap: clamp(0.8rem, 2vw, 1.8rem);
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.9rem;
  white-space: nowrap;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--forest);
  outline-offset: 4px;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--forest);
}

.hero {
  padding-bottom: clamp(4rem, 8vw, 7rem);
}

.hero-image {
  background: var(--cream);
}

.hero-image img {
  width: 100%;
  height: auto;
}

.hero-copy {
  padding-top: clamp(2.7rem, 6vw, 5rem);
  text-align: center;
}

.eyebrow {
  margin: 0 0 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--moss);
}

.hero h1,
.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
}

.tagline {
  margin: 0.9rem 0 0;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  color: var(--forest);
}

.lede {
  margin: 0.85rem auto 0;
  color: var(--ink-soft);
  max-width: 40rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.7rem;
  padding: 0 1.1rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.95rem;
}

.btn.primary {
  background: var(--forest);
  color: var(--paper);
}

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

.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  scroll-margin-top: 5rem;
}

.section-head {
  max-width: 44rem;
  margin-bottom: 2.2rem;
}

.section-head h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.section-head > p:last-child {
  margin: 0.6rem 0 0;
  color: var(--ink-soft);
}

.thoughts,
.about {
  background: var(--cream);
}

.topic-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.topic-grid li {
  min-width: 0;
  padding: 1.5rem 1rem;
  background: var(--paper);
  border-top: 2px solid var(--peach);
  font-family: var(--serif);
  font-size: 1.1rem;
}

.project-card {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: #fffdf9;
}

.project-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
}

.project-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  overflow-wrap: anywhere;
}

.project-status {
  padding: 0.28rem 0.8rem;
  border-radius: 999px;
  background: var(--cream);
  color: var(--forest);
  font-size: 0.82rem;
}

.project-card > p {
  max-width: 45rem;
  margin: 1.4rem 0 0;
  color: var(--ink-soft);
}

.project-card .project-note {
  margin-top: 1rem;
  font-size: 0.9rem;
}

.about p {
  color: var(--ink-soft);
  margin: 0 0 1.15rem;
}

.about .section-head .eyebrow {
  color: var(--moss);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.6rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
  background: var(--paper);
}

.footer-brand {
  font-family: var(--serif);
  color: var(--ink);
  margin: 0 0 0.35rem;
}

.fineprint {
  font-size: 0.8rem;
  opacity: 0.8;
}

@media (max-width: 800px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 4.5rem;
    right: 1.2rem;
    left: 1.2rem;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 0.9rem;
    padding: 0.4rem;
    box-shadow: 0 12px 24px rgba(28, 42, 36, 0.12);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 0.7rem 0.8rem;
  }

  .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .hero-copy {
    text-align: left;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .topic-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}