:root {
  --ink: #dedede;
  --muted: #a9afb3;
  --paper: #2b2b2b;
  --card: #313335;
  --line: #4a4d4f;
  --accent: #4a86cf;
  --accent-dark: #619dde;
  --accent-soft: #343a40;
  --blue: #67d8ef;
  --orange: #d9a35f;
  --mono: "IBM Plex Mono", monospace;
  --sans: "DM Sans", system-ui, sans-serif;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 90% 5%, rgba(88, 157, 246, 0.1), transparent 28rem),
    radial-gradient(circle at 5% 40%, rgba(103, 216, 239, 0.04), transparent 24rem),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.65;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: #f8f8f2;
  color: #252525;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(1180px, calc(100% - 2rem));
  margin: 1rem auto 0;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(98, 114, 164, 0.5);
  border-radius: 1rem;
  background: rgba(43, 43, 43, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  width: max-content;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.2rem;
  height: 2.2rem;
  place-items: center;
  border-radius: 0.65rem;
  background: #3f77b5;
  color: #f2f2f2;
  font-family: var(--mono);
  font-size: 0.78rem;
}

nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
}

nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  color: var(--accent);
}

.language-toggle {
  justify-self: end;
  min-width: 2.5rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  color: var(--ink);
  background: #353739;
  font: 600 0.8rem var(--mono);
  cursor: pointer;
}

.language-zh,
html[lang="zh-TW"] .language-en {
  display: none;
}

html[lang="zh-TW"] .language-zh {
  display: inline;
}

main,
footer {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(310px, 0.8fr);
  gap: clamp(2rem, 7vw, 6rem);
  align-items: center;
  min-height: calc(100vh - 6rem);
  padding: 6rem 0;
}

.eyebrow,
.section-number {
  color: var(--accent);
  font: 500 0.78rem var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 1rem;
  font-size: clamp(3rem, 7vw, 6.6rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.hero-role {
  color: var(--accent-dark);
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  font-weight: 700;
}

.hero-intro {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.7rem 1.15rem;
  border-radius: 0.7rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

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

.button-primary {
  color: #f5f7fa;
  background: var(--accent);
}

.button-primary:hover {
  background: #3d73b3;
}

.button-secondary {
  border: 1px solid var(--line);
  background: rgba(53, 55, 57, 0.72);
}

.hero-panel {
  overflow: hidden;
  border: 1px solid #596d8f;
  border-radius: 1rem;
  color: #f8f8f2;
  background: #25262b;
  box-shadow: var(--shadow);
  transform: rotate(1deg);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #45494f;
}

.terminal-bar span {
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: #69758a;
}

.terminal-bar span:first-child {
  background: #ff5555;
}

.terminal-bar span:nth-child(2) {
  background: #f1fa8c;
}

.terminal-bar span:nth-child(3) {
  background: #50fa7b;
}

.terminal-bar p {
  margin: 0 0 0 auto;
  color: #9aaace;
  font: 0.67rem var(--mono);
}

.terminal-content {
  padding: clamp(1.4rem, 4vw, 2.5rem);
  font-family: var(--mono);
  font-size: 0.84rem;
}

.prompt {
  color: #67d8ef;
}

.terminal-content ul {
  display: grid;
  gap: 0.8rem;
  margin: 1.3rem 0 2rem;
  padding-left: 1.25rem;
  color: #d7d7e0;
}

.terminal-status {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0;
  color: #9aaace;
}

.status-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #67d8ef;
  box-shadow: 0 0 0 5px rgba(103, 216, 239, 0.1);
}

.section {
  padding: 7rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 6rem;
}

.section-heading {
  max-width: 680px;
  margin-bottom: 3rem;
}

.section-heading h2,
.contact h2 {
  margin-bottom: 1rem;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child {
  color: var(--muted);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 8vw, 7rem);
}

.about-copy {
  color: var(--muted);
  font-size: 1.08rem;
}

blockquote {
  margin: 0;
  padding: 2rem;
  border-left: 4px solid var(--accent);
  background: linear-gradient(135deg, rgba(88, 157, 246, 0.1), rgba(103, 216, 239, 0.035));
  font-size: 1.15rem;
  font-weight: 600;
}

blockquote p {
  margin: 0;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  min-height: 30rem;
  padding: clamp(1.4rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(49, 51, 53, 0.9);
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.project-featured {
  grid-column: 1 / -1;
  min-height: auto;
  background:
    linear-gradient(120deg, rgba(88, 157, 246, 0.11), rgba(103, 216, 239, 0.035)),
    var(--card);
}

.project-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.project-index {
  color: var(--muted);
  font: 0.75rem var(--mono);
}

.status {
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  font: 0.67rem var(--mono);
}

.status-active {
  color: #252525;
  background: #50fa7b;
}

.status-revision {
  color: #252525;
  background: #d9a35f;
}

.status-refactor {
  color: #252525;
  background: #8be9fd;
}

.project-card h3 {
  margin-bottom: 1rem;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.project-card > p,
.project-highlights {
  color: var(--muted);
}

.project-highlights {
  display: grid;
  gap: 0.4rem;
  padding-left: 1.2rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: auto 0 1.5rem;
  padding-top: 2rem;
}

.tag-list span {
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  color: var(--muted);
  font: 0.68rem var(--mono);
  background: #292a2b;
}

.text-link {
  width: max-content;
  color: var(--accent-dark);
  font-weight: 700;
  text-underline-offset: 0.3rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.skill-group {
  padding: 1.6rem 1rem 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.skill-group:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.skill-group:nth-child(even) {
  padding-left: 1.6rem;
}

.skill-group p {
  margin-bottom: 0.5rem;
  color: var(--accent);
  font: 0.7rem var(--mono);
  text-transform: uppercase;
}

.skill-group h3 {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.25rem);
}

.skill-learning {
  grid-column: 1 / -1;
  border-right: 0 !important;
  background: linear-gradient(90deg, rgba(88, 157, 246, 0.09), transparent);
}

.skills-note {
  max-width: 700px;
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.approach-grid article {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(49, 51, 53, 0.72);
}

.approach-grid article > span {
  color: var(--accent);
  font: 0.7rem var(--mono);
}

.approach-grid h3 {
  margin-top: 2.5rem;
  margin-bottom: 0.7rem;
  font-size: 1.25rem;
}

.approach-grid p {
  margin-bottom: 0;
  color: var(--muted);
}

.contact {
  text-align: center;
}

.contact > p:not(.section-number) {
  max-width: 680px;
  margin-inline: auto;
  color: var(--muted);
  font-size: 1.08rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.contact-links a {
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--card);
  font-weight: 700;
  text-decoration: none;
}

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

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

footer p {
  margin: 0;
}

:focus-visible {
  outline: 3px solid rgba(139, 233, 253, 0.55);
  outline-offset: 4px;
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 800px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .hero,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 5rem 0;
  }

  .hero-panel {
    transform: none;
  }

  .project-grid,
  .approach-grid {
    grid-template-columns: 1fr;
  }

  .project-featured {
    grid-column: auto;
  }
}

@media (max-width: 560px) {
  main,
  footer {
    width: min(100% - 1.5rem, 1120px);
  }

  .site-header {
    width: calc(100% - 1rem);
    margin-top: 0.5rem;
  }

  .brand > span:last-child {
    display: none;
  }

  .hero {
    padding-top: 4rem;
  }

  h1 {
    font-size: clamp(2.8rem, 16vw, 4.5rem);
  }

  .section {
    padding: 5rem 0;
  }

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

  .skill-group,
  .skill-group:nth-child(even) {
    grid-column: auto;
    padding: 1.3rem 0;
    border-right: 0;
  }

  .project-topline,
  footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .contact-links {
    flex-direction: column;
  }
}