@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Colors from DESIGN.md */
  --surface: #F8FAFC;
  --surface-tint: #F1F5F9;
  --primary: #0F172A;
  --secondary: #64748B;
  --accent: #38BDF8;
  --border-color: rgba(100, 116, 139, 0.2);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 64px;
  --gutter: 24px;
  --margin-page: 48px;

  /* Border Radius */
  --radius-sm: 0.125rem;
  --radius-default: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--surface);
  color: var(--primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.resume-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--margin-page);
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-xl) var(--gutter);
}

/* Header */
.resume-header {
  grid-column: span 12;
  margin-bottom: var(--space-md);
  padding: 0 var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
}

/* Download PDF Button */
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--primary);
  border: none;
  border-radius: var(--radius-default);
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  transition: background-color 0.2s ease;
  align-self: center;
}

.download-btn:hover {
  background-color: #1E293B;
}

.download-icon {
  width: 16px;
  height: 16px;
}

.name-title {
  font-family: var(--font-sans);
  font-size: 36px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--primary);
  text-transform: capitalize;
  margin-bottom: var(--space-xs);
}

.name-subtitle {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 500;
  line-height: 24px;
  color: var(--secondary);
  letter-spacing: 0.02em;
}

/* Main Grid Layout */
.sidebar {
  grid-column: span 4;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.main-content {
  grid-column: span 8;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Section Wrapper (Active indicator targets this) */
.resume-section {
  position: relative;
  padding-left: var(--space-md);
  border-left: 2px solid transparent;
  transition: border-color 0.3s ease, padding-left 0.3s ease;
}

.resume-section.active, .resume-section:hover {
  border-left: 2px solid var(--primary);
}

/* Section Heading */
.section-heading {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 20px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: var(--space-md);
  display: inline-block;
  border-bottom: 2px solid var(--primary);
  padding-bottom: var(--space-xs);
}

/* Sidebar Sections */
.sidebar-section {
  padding-left: var(--space-md);
}

.sidebar-section .section-heading {
  margin-bottom: var(--space-md);
}

/* Contact List */
.contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-left: 0;
}

.contact-item {
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--secondary);
}

.contact-link {
  color: var(--secondary);
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 18px;
  transition: color 0.2s ease;
}

.contact-link:hover {
  color: var(--primary);
}

.contact-icon {
  width: 14px;
  height: 14px;
  margin-right: var(--space-sm);
  color: var(--secondary);
  flex-shrink: 0;
}

/* Skills Layout */
.skills-category {
  margin-bottom: var(--space-md);
}

.skills-category-title {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  line-height: 16px;
  color: var(--primary);
  background-color: var(--surface-tint);
  padding: 4px var(--space-sm);
  border-radius: var(--radius-default);
  white-space: nowrap;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.skill-tag:hover {
  background-color: #E2E8F0;
  transform: translateY(-1px);
}

/* Education List */
.education-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.education-item {
  position: relative;
}

.education-title {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.education-meta {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--secondary);
  margin-top: 2px;
}

/* Experience Cards */
.experience-card {
  margin-bottom: var(--space-lg);
  position: relative;
  transition: transform 0.2s ease;
}

.job-title {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  line-height: 24px;
  color: var(--primary);
  margin-bottom: 2px;
}

.company-date {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  line-height: 18px;
  color: var(--secondary);
  margin-bottom: var(--space-md);
}

.experience-sub-section {
  margin-bottom: var(--space-md);
}

.experience-sub-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

/* Lists and Bullets */
.bullet-list {
  list-style: none;
  padding-left: 0;
}

.bullet-list li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-sm);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 24px;
  color: var(--primary);
}

.bullet-list li strong {
  font-weight: 600;
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px; /* Aligned vertically with line-height of 15px font */
  width: 3px;
  height: 3px;
  background-color: var(--primary);
  border-radius: 0; /* Square glyph */
}

/* Biography Sub-sections */
.bio-sub-section {
  margin-bottom: var(--space-md);
}

.bio-sub-title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.bio-text {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 400;
  line-height: 24px;
  color: var(--primary);
  text-align: justify;
  margin-bottom: var(--space-md);
}

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

/* Dividers */
.divider {
  grid-column: span 12;
  height: 1px;
  background: linear-gradient(to right, var(--secondary) 80%, transparent 100%);
  opacity: 0.2;
  border: none;
  margin: var(--space-sm) 0;
}

/* Intro Paragraphs */
.intro-text-en {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 24px;
  color: var(--primary);
  margin-bottom: var(--space-sm);
}

.intro-text-zh {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 24px;
  color: var(--primary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .resume-container {
    grid-template-columns: 1fr;
    padding: var(--space-lg);
    gap: var(--space-lg);
  }

  .resume-header {
    grid-column: span 1;
    padding: 0;
  }

  .name-title {
    font-size: 28px;
  }

  .sidebar {
    grid-column: span 1;
    gap: var(--space-md);
  }

  .main-content {
    grid-column: span 1;
    gap: var(--space-md);
  }

  .divider {
    grid-column: span 1;
    margin: var(--space-sm) 0;
  }

  .resume-section, .sidebar-section {
    padding-left: var(--space-sm);
  }
}

/* Print Styles */
@media print {
  body {
    background-color: #ffffff;
    color: #000000;
  }

  .download-btn {
    display: none !important;
  }

  .resume-container {
    max-width: 100%;
    padding: 20px;
    gap: 20px;
  }

  .resume-section {
    border-left: none !important;
    padding-left: 0 !important;
    page-break-inside: avoid;
  }

  .divider {
    background: #64748B !important;
    opacity: 0.2 !important;
  }

  .skill-tag {
    background-color: #F1F5F9 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}