:root {
  --bg: #f7f6f3;          /* Slightly cleaner warm paper white */
  --card-bg: rgba(255, 255, 255, 0.7);     /* Glassmorphism base */
  --card-bg-hover: rgba(255, 255, 255, 0.95);
  --ink: #3e3c3a;         /* Darker slate charcoal for readability */
  --heading: #161514;     /* Deep rich charcoal */
  --muted: #6e7270;       /* Refined gray */
  --border: rgba(72, 70, 68, 0.06);
  --border-hover: rgba(72, 70, 68, 0.12);
  --sage: #526656;        /* Muted deep sage for better contrast and premium feel */
  --clay: #9c6c59;
  --pink: #916161;
  --mist: #e8e3dc;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.05);
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  /* Subtle grid pattern background */
  background-image: 
    linear-gradient(rgba(72, 70, 68, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(72, 70, 68, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
}

body {
  color: var(--ink);
  background-color: var(--bg);
  /* Added high quality Chinese system font stack */
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.8; /* Chinese text needs slightly more leading */
  letter-spacing: 0.015em; /* Subtle spacing for Chinese body text */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* --- NAVIGATION --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  background-color: rgba(247, 246, 243, 0.8); /* Matches var(--bg) with opacity */
  transition: var(--transition);
}

.header-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--heading);
  letter-spacing: -0.02em;
  position: relative;
}

.brand::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--sage);
  transition: var(--transition);
}

.brand:hover::after {
  width: 100%;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  position: relative;
  padding: 4px 0;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--sage);
  transition: var(--transition);
  transform: translateX(-50%);
}

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

.nav a:hover::after {
  width: 100%;
}

/* --- MAIN CONTAINER --- */
.main-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 24px 120px 24px;
}

/* --- HERO SECTION --- */
.hero-section {
  position: relative;
  margin-bottom: 100px;
  padding-bottom: 80px;
  border-bottom: 1px solid var(--border);
}

/* Glow Blobs */
.glow-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  z-index: -1;
  opacity: 0.35;
  pointer-events: none;
  animation: float-glow 20s infinite alternate ease-in-out;
}

.glow-1 {
  top: -10%;
  right: -5%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(107, 130, 112, 0.2) 0%, rgba(107, 130, 112, 0) 70%);
}

.glow-2 {
  bottom: 10%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(166, 127, 111, 0.15) 0%, rgba(166, 127, 111, 0) 70%);
  animation-delay: -5s;
}

@keyframes float-glow {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(25px, -25px) scale(1.1);
  }
  100% {
    transform: translate(-15px, 15px) scale(0.9);
  }
}

.hero-content-wrapper {
  margin-bottom: 40px;
}

.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--sage);
  margin-bottom: 28px;
  padding: 6px 14px;
  background-color: rgba(107, 130, 112, 0.08);
  border: 1px solid rgba(107, 130, 112, 0.12);
  border-radius: 20px;
}

.hero-name-wrapper {
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-kicker {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--sage);
  text-transform: uppercase;
  opacity: 0.85;
}

.hero-name {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 850;
  letter-spacing: -0.015em; /* Premium English tracking */
  line-height: 1.1;
  background: linear-gradient(135deg, var(--heading) 40%, #5c5956 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0;
}

.hero-title {
  font-size: clamp(18px, 3vw, 24px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--heading);
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-bio {
  font-size: 15px;
  color: var(--muted);
  max-width: 720px;
  line-height: 1.8;
  margin-bottom: 0;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 800px;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-metrics div {
  min-width: 0;
  padding: 20px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.hero-metrics div:hover {
  background: var(--card-bg-hover);
  border-color: rgba(107, 130, 112, 0.2);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.hero-metrics strong {
  display: block;
  margin-bottom: 4px;
  color: var(--heading);
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.hero-metrics span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 28px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}

.button.primary {
  background-color: var(--heading);
  color: var(--bg);
  border: 1px solid var(--heading);
}

.button.primary:hover {
  background-color: transparent;
  color: var(--heading);
  border-color: var(--heading);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.button.secondary {
  border: 1px solid var(--border);
  background-color: var(--card-bg);
  backdrop-filter: blur(8px);
  color: var(--heading);
}

.button.secondary:hover {
  background-color: var(--heading);
  color: var(--bg);
  border-color: var(--heading);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

/* --- COMMON SECTION STYLES --- */
.content-section {
  margin-bottom: 110px;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 44px;
}

.section-number {
  font-family: monospace;
  font-size: 13px;
  color: var(--sage);
  opacity: 0.85;
  letter-spacing: 0.1em;
}

.section-header h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--heading);
  letter-spacing: 0.02em; /* Chinese header spacing */
}

/* --- PAWMOOD PROJECT --- */
.project-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  align-items: center;
  gap: 40px;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 44px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  overflow: hidden;
}

.project-showcase:hover {
  border-color: rgba(107, 130, 112, 0.25);
  background-color: var(--card-bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.project-tagline {
  font-size: 13px;
  font-weight: 600;
  color: var(--sage);
  margin-bottom: 16px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.project-description {
  font-size: 15px;
  color: var(--ink);
  line-height: 1.8;
  margin-bottom: 28px;
}

.feature-list {
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}

.feature-list div {
  padding-left: 16px;
  border-left: 2px solid rgba(107, 130, 112, 0.3);
}

.feature-kicker {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--sage);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.feature-list p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tag-group span {
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  background-color: rgba(107, 130, 112, 0.04);
  border: 1px solid rgba(107, 130, 112, 0.08);
  border-radius: 20px;
  color: var(--muted);
  transition: var(--transition);
}

.tag-group span:hover {
  background-color: rgba(107, 130, 112, 0.1);
  color: var(--sage);
}

.arrow-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--heading);
  border-bottom: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.arrow-link:hover {
  color: var(--sage);
  border-color: var(--sage);
}

.phone-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: end;
  gap: 18px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(166, 127, 111, 0.08), rgba(107, 130, 112, 0.06));
  border: 1px solid var(--border);
  border-radius: 14px;
}

.phone-frame {
  min-width: 0;
  margin: 0;
}

.phone-frame img {
  display: block;
  width: 100%;
  aspect-ratio: 1242 / 2688;
  object-fit: cover;
  object-position: top center;
  border: 8px solid #fdfbf8;
  border-radius: 28px;
  box-shadow: 0 16px 36px rgba(72, 70, 68, 0.1);
  transition: var(--transition);
}

.phone-frame img:hover {
  transform: scale(1.03);
}

.home-screen {
  transform: translateY(24px);
}

.result-screen {
  transform: translateY(-8px);
}

.phone-frame figcaption {
  margin-top: 12px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}

/* --- CASE STUDIES --- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.case-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.case-card:hover {
  border-color: rgba(107, 130, 112, 0.25);
  background-color: var(--card-bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.case-card.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.85), rgba(232, 227, 220, 0.45));
  border: 1px solid rgba(107, 130, 112, 0.15);
}

.case-card.featured:hover {
  border-color: rgba(107, 130, 112, 0.35);
}

.case-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.case-meta span {
  font-size: 11px;
  font-weight: 700;
  color: var(--sage);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.case-meta strong {
  color: var(--heading);
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.case-card p {
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}

.case-results {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.case-results span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  color: var(--ink);
  background-color: rgba(107, 130, 112, 0.06);
  border: 1px solid rgba(107, 130, 112, 0.1);
  border-radius: 20px;
  font-size: 12px;
  line-height: 1.35;
  transition: var(--transition);
}

.case-results span:hover {
  background-color: rgba(107, 130, 112, 0.12);
  border-color: rgba(107, 130, 112, 0.2);
}

.case-results strong {
  margin-right: 4px;
  color: var(--heading);
}

/* --- EXPERIENCE (TIMELINE) --- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: var(--transition);
  margin-left: -24px;
  margin-right: -24px;
}

.timeline-item:hover {
  background: var(--card-bg-hover);
  border-color: var(--border);
  transform: translateX(6px);
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-date {
  font-size: 14px;
  font-weight: 600;
  color: var(--heading);
}

.timeline-org {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.timeline-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.timeline-text {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.75;
}

.experience-subsection {
  margin-top: 36px;
}

.subsection-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--sage);
  line-height: 1.25;
}

/* --- SKILLS GRID --- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.skill-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.skill-card:hover {
  border-color: rgba(107, 130, 112, 0.25);
  background-color: var(--card-bg-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.skill-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.skill-card p {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.75;
}

/* --- CONTACT --- */
.contact-box {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 44px;
  box-shadow: var(--shadow);
}

.contact-lead {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 28px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 22px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  background-color: rgba(0, 0, 0, 0.01);
  border: 1px solid var(--border);
  color: var(--ink);
  transition: var(--transition);
}

.contact-btn:hover {
  border-color: rgba(107, 130, 112, 0.25);
  background-color: var(--card-bg-hover);
  color: var(--heading);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.contact-btn.highlight {
  background-color: rgba(107, 130, 112, 0.08);
  border-color: rgba(107, 130, 112, 0.15);
  color: var(--sage);
}

.contact-btn.highlight:hover {
  background-color: rgba(107, 130, 112, 0.15);
  border-color: var(--sage);
  box-shadow: 0 4px 12px rgba(107, 130, 112, 0.1);
}

/* --- FOOTER --- */
.site-footer {
  text-align: center;
  padding: 60px 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}

/* --- ANIMATIONS --- */
.fade-element {
  opacity: 1;
  transform: none;
}

.js-enabled .fade-element {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.js-enabled .fade-element.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  .site-header {
    position: relative;
  }
  
  .header-container {
    padding: 16px;
  }
  
  .main-container {
    padding: 40px 16px 80px 16px;
  }
  
  .hero-section {
    margin-bottom: 60px;
    padding-bottom: 40px;
  }

  .hero-metrics,
  .project-showcase,
  .case-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .button {
    flex: 1 1 180px;
  }

  .phone-gallery {
    gap: 12px;
    padding: 14px;
  }

  .phone-frame img {
    border-width: 6px;
    border-radius: 22px;
  }

  .home-screen,
  .result-screen {
    transform: none;
  }
  
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-bottom: 24px;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .project-showcase, .contact-box {
    padding: 24px;
  }
}

@media (max-width: 540px) {
  .nav {
    gap: 14px;
  }

  .nav a {
    font-size: 12px;
  }

  .hero-metrics {
    gap: 10px;
  }

  .hero-metrics div,
  .case-card,
  .skill-card {
    padding: 18px;
  }

  .phone-gallery {
    grid-template-columns: minmax(0, 1fr);
  }

  .phone-frame img {
    max-width: 240px;
    margin: 0 auto;
  }
}

/* --- BILINGUAL VISIBILITY CONTROL --- */
html[lang="en"] [lang="zh"] {
  display: none !important;
}
html[lang="zh"] [lang="en"] {
  display: none !important;
}

/* Language Toggle Button styling */
.lang-toggle-btn {
  background: rgba(107, 130, 112, 0.08);
  border: 1px solid rgba(107, 130, 112, 0.15);
  color: var(--sage);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-toggle-btn:hover {
  background: var(--heading);
  border-color: var(--heading);
  color: var(--bg);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .lang-toggle-btn {
    margin-left: 0;
  }
}