html {
  color-scheme: dark;
}

html.theme-light {
  color-scheme: light;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #d9e0ea;
  background:
    radial-gradient(circle at 15% 20%, rgba(121, 170, 255, 0.18) 0%, rgba(121, 170, 255, 0) 35%),
    radial-gradient(circle at 85% 0%, rgba(79, 214, 255, 0.14) 0%, rgba(79, 214, 255, 0) 30%),
    linear-gradient(180deg, #0f141d 0%, #0c1118 55%, #0a0f15 100%);
  min-height: 100vh;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 48px 20px 36px;
}

header {
  text-align: center;
  margin-bottom: 34px;
  padding: 30px 24px 24px;
  border-radius: 22px;
  background: linear-gradient(155deg, rgba(25, 34, 47, 0.8), rgba(17, 24, 34, 0.72));
  border: 1px solid rgba(137, 169, 212, 0.22);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(3px);
}

.site-logo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
  border: 4px solid rgba(255, 255, 255, 0.92);
}

.top-controls {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 8px;
  align-items: center;
  z-index: 100;
}

.lang-switch {
  background: rgba(14, 20, 30, 0.86);
  border: 1px solid rgba(166, 191, 231, 0.3);
  border-radius: 20px;
  padding: 6px 4px;
  display: flex;
  gap: 4px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(6px);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(166, 191, 231, 0.3);
  background: rgba(14, 20, 30, 0.86);
  color: #f6f9ff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(6px);
  font-size: 16px;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.12);
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 6px 14px;
  cursor: pointer;
  border-radius: 16px;
  font-size: 14px;
  color: #b7c4d6;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: linear-gradient(135deg, #4b6fff, #45b9ff);
  color: #f6f9ff;
}

.lang-btn:hover:not(.active) {
  background: rgba(255, 255, 255, 0.08);
}

h1 {
  font-size: 2.2rem;
  color: #f7fbff;
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.subtitle {
  font-size: 1.1rem;
  color: #b4c0cf;
  margin-bottom: 20px;
}

.website-link {
  display: inline-block;
  background: linear-gradient(135deg, #4a77ff, #35b8ff);
  color: #f7fbff;
  padding: 12px 28px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all 0.3s ease;
  box-shadow: 0 8px 22px rgba(46, 113, 255, 0.3);
}

.website-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(53, 129, 255, 0.36);
}

.website-link.link-secondary {
  background: linear-gradient(135deg, #14a0ff, #29d6d9);
  box-shadow: 0 8px 22px rgba(20, 160, 255, 0.26);
}

.website-link.link-ghost {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(164, 190, 228, 0.3);
  color: #d9e8ff;
  box-shadow: none;
}

.header-links {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}


.section {
  background: linear-gradient(165deg, rgba(25, 34, 48, 0.9), rgba(17, 24, 35, 0.9));
  border-radius: 16px;
  padding: 30px;
  margin-bottom: 24px;
  border: 1px solid rgba(134, 164, 205, 0.2);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.28);
}

.section h2 {
  font-size: 1.3rem;
  color: #f1f7ff;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid rgba(145, 173, 214, 0.2);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.feature-item {
  padding: 20px;
  background: linear-gradient(160deg, rgba(34, 47, 66, 0.84), rgba(23, 32, 46, 0.82));
  border: 1px solid rgba(142, 170, 211, 0.16);
  border-radius: 12px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-item:hover {
  transform: translateY(-3px);
  border-color: rgba(86, 157, 255, 0.45);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
}

.project-card {
  display: block;
  padding: 20px;
  background: linear-gradient(160deg, rgba(34, 47, 66, 0.84), rgba(23, 32, 46, 0.82));
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid rgba(142, 170, 211, 0.16);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: rgba(86, 157, 255, 0.45);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
}

.project-card h3 {
  font-size: 1rem;
  color: #e8f0ff;
  margin-bottom: 8px;
}

.project-card p {
  font-size: 0.9rem;
  color: #9fb0c7;
}

.project-card .feature-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.feature-item h3 {
  font-size: 1rem;
  color: #e8f0ff;
  margin-bottom: 8px;
}

.feature-item p {
  font-size: 0.9rem;
  color: #9fb0c7;
}

.purpose-list {
  list-style: none;
}

.purpose-list li {
  padding: 12px 0;
  border-bottom: 1px solid rgba(144, 173, 214, 0.16);
  display: flex;
  align-items: center;
  gap: 12px;
}

.purpose-list li:last-child {
  border-bottom: none;
}

.purpose-list .icon {
  font-size: 1.2rem;
}

.tech-info {
  color: #adc0d8;
}

.tech-info a {
  color: #6ebeff;
  text-decoration: none;
}

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

.tech-project-link {
  margin-top: 15px;
}

.contact-info p {
  margin-bottom: 10px;
  color: #adc0d8;
}

.contact-note {
  margin-top: 15px;
  color: #9fb0c7;
}

.contact-info a {
  color: #7cc8ff;
  text-decoration: none;
}

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

.disclaimer {
  font-size: 0.9rem;
  color: #9fb0c7;
  line-height: 1.8;
}

footer {
  text-align: center;
  padding: 30px 0;
  color: #8fa2bc;
  font-style: italic;
}

.repo-link {
  margin-top: 15px;
  font-style: normal;
}

.repo-link a {
  color: #9cb0c8;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color 0.2s ease;
}

.repo-link-icon {
  vertical-align: middle;
  margin-right: 6px;
}

.repo-link a:hover {
  color: #d6e7ff;
}

.hidden {
  display: none;
}

.friend-section {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(144, 173, 214, 0.16);
}

.friend-section h3 {
  font-size: 1rem;
  color: #e8f0ff;
  margin-bottom: 16px;
  font-weight: 500;
}

.friend-images {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.friend-img {
  max-width: 200px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease;


}

img {
  object-fit: cover;
}

.friend-img:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.38);
  cursor: pointer;
}

/* 图片全屏预览模态框 */
.img-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  padding: 20px;
  box-sizing: border-box;
}

.img-modal.active {
  display: flex;
}

.img-modal img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  animation: modalFadeIn 0.2s ease;
}

.website-link:focus-visible,
.lang-btn:focus-visible,
.theme-toggle:focus-visible,
.img-modal-close:focus-visible,
.project-card:focus-visible {
  outline: 2px solid #7ec7ff;
  outline-offset: 2px;
}

.theme-light {
  color: #2e3a48;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
}

.theme-light h1 {
  color: #2c3e50;
}

.theme-light .subtitle,
.theme-light .disclaimer,
.theme-light .project-card p,
.theme-light .feature-item p,
.theme-light .tech-info,
.theme-light .contact-info p,
.theme-light footer {
  color: #637487;
}

.theme-light header,
.theme-light .section {
  background: #ffffff;
  border: 1px solid #dde7f2;
  box-shadow: 0 10px 30px rgba(32, 64, 96, 0.08);
}

.theme-light .section h2,
.theme-light .feature-item h3,
.theme-light .project-card h3,
.theme-light .friend-section h3 {
  color: #2c3e50;
}

.theme-light .section h2,
.theme-light .friend-section {
  border-color: #e5edf5;
}

.theme-light .feature-item,
.theme-light .project-card {
  background: #f8fbff;
  border-color: #dce8f5;
}

.theme-light .lang-switch,
.theme-light .theme-toggle {
  background: rgba(255, 255, 255, 0.9);
  border-color: #d2ddea;
  box-shadow: 0 6px 16px rgba(51, 72, 96, 0.16);
}

.theme-light .theme-toggle {
  color: #465e7a;
}

.theme-light .lang-btn {
  color: #4a5d75;
}

.theme-light .lang-btn:hover:not(.active) {
  background: #eef3f9;
}

.theme-light .repo-link a {
  color: #6e8094;
}

.theme-light .repo-link a:hover {
  color: #2c3e50;
}

.theme-light .website-link.link-ghost {
  background: #eef3f9;
  border-color: #d0deed;
  color: #3f5873;
}

.theme-light .website-link.link-ghost:hover {
  background: #e5edf7;
  box-shadow: 0 8px 20px rgba(65, 95, 128, 0.16);
}

.theme-light .tech-info a,
.theme-light .contact-info a {
  color: #2f86d8;
}

.theme-light .contact-note {
  color: #637487;
}

.theme-light .img-modal-close {
  background: rgba(20, 34, 54, 0.35);
  color: #fff;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.img-modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.img-modal-close:hover {
  background: rgba(255, 255, 255, 0.3);
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.6rem;
  }

  .container {
    padding-top: 72px;
  }

  header {
    padding: 22px 16px 16px;
  }

  .section {
    padding: 20px;
  }

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

  .top-controls {
    top: 10px;
    right: 10px;
  }

  .website-link {
    width: 100%;
    text-align: center;
  }
}