html, body, main, header, footer {
  padding: 0px;
  margin: 0px;
}

:root {
  --green-50: #e8f5e9;
  --green-100: #c8e6c9;
  --green-200: #a5d6a7;
  --green-300: #81c784;
  --green-400: #66bb6a;
  --green-500: #4caf50;
  --green-600: #43a047;
  --green-700: #388e3c;
  --green-800: #2e7d32;
  --green-900: #1b5e20;
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #eeeeee;
  --gray-300: #e0e0e0;
  --gray-400: #bdbdbd;
  --gray-600: #757575;
  --gray-700: #616161;
  --gray-800: #424242;
  --gray-900: #212121;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 12px;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, var(--green-50) 0%, #f1f8e9 50%, var(--green-50) 100%);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  background: linear-gradient(135deg, var(--green-600), var(--green-700));
  padding: 48px 24px 40px;
}

.profile-section {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green-200), var(--green-400));
  border: 4px solid rgba(255,255,255,0.4);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: var(--white);
}

.name-title h1 {
  margin: 0;
  font-size: 32px;
  color: var(--white);
  font-weight: 700;
  letter-spacing: 2px;
}

.name-title p {
  margin: 4px 0 0;
  font-size: 16px;
  color: rgba(255,255,255,0.85);
  font-weight: 400;
}

.contact-info {
  margin-left: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: rgba(255,255,255,0.9);
}

.contact-icon {
  font-size: 14px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

div#app {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  align-items: start;
}

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 20px;
  transition: box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--green-700);
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--green-100);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--green-500);
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.skill-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

.skill-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green-400), var(--green-600));
  border-radius: 4px;
  transition: width 0.6s ease;
}

.languages-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.lang-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.lang-name {
  font-weight: 500;
  color: var(--gray-700);
}

.lang-level {
  font-size: 12px;
  color: var(--green-600);
  background: var(--green-50);
  padding: 2px 10px;
  border-radius: 10px;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.timeline-item {
  position: relative;
  padding-left: 20px;
  border-left: 2px solid var(--green-200);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green-400);
  border: 2px solid var(--white);
  box-shadow: 0 0 0 2px var(--green-300);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 4px;
}

.timeline-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
}

.timeline-subtitle {
  font-size: 14px;
  color: var(--green-600);
  font-weight: 500;
  margin: 0;
}

.timeline-date {
  font-size: 13px;
  color: var(--gray-600);
  white-space: nowrap;
}

.timeline-desc {
  font-size: 14px;
  color: var(--gray-600);
  margin: 6px 0 0;
  line-height: 1.7;
}

.timeline-desc ul {
  margin: 4px 0 0;
  padding-left: 18px;
}

.timeline-desc li {
  margin-bottom: 3px;
}

footer {
  text-align: center;
  padding: 24px;
  background: var(--white);
  border-top: 1px solid var(--green-100);
}

.page-info {
  font-size: 13px;
  color: var(--gray-600);
}

.page-info a {
  color: var(--green-600);
  text-decoration: none;
}

.page-info a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .profile-section {
    flex-direction: column;
    text-align: center;
  }
  .contact-info {
    margin-left: 0;
    grid-template-columns: 1fr 1fr;
    justify-items: center;
  }
  div#app {
    grid-template-columns: 1fr;
  }
  .sidebar {
    order: -1;
  }
  .section-title {
    font-size: 16px;
  }
  header {
    padding: 32px 16px 28px;
  }
  main {
    padding: 20px 16px 32px;
  }
}

@media (max-width: 576px) {
  .contact-info {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .name-title h1 {
    font-size: 24px;
  }
  .avatar {
    width: 80px;
    height: 80px;
    font-size: 32px;
  }
  .card {
    padding: 16px;
  }
  .timeline-header {
    flex-direction: column;
    gap: 2px;
  }
}