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

:root {
  --bg: #FAF7F2;
  --color: #3D3226;
  --color-secondary: #8C7B6B;
  --color-muted: #B8A898;
  --color-link: #7A6B5D;
  --color-link-hover: #3D3226;
  --card-bg: #FDFAF5;
  --card-border: #E0D7CC;
  --btn-bg: #FAF7F2;
  --btn-hover-bg: #F5EDE3;
  --btn-hover-border: #D1C4B6;
  --social-bg: #F5EDE3;
  --social-hover-bg: #E8DDD0;
  --shadow: rgba(0,0,0,0.08);
  --shadow-hover: rgba(0,0,0,0.14);
  --shadow-btn: rgba(0,0,0,0.06);
  --transition-speed: 0.3s;
}

.dark {
  --bg: #1B1815;
  --color: #E0D6C8;
  --color-secondary: #A89984;
  --color-muted: #70655A;
  --color-link: #A89984;
  --color-link-hover: #E0D6C8;
  --card-bg: #25211D;
  --card-border: #3D3630;
  --btn-bg: #25211D;
  --btn-hover-bg: #332E29;
  --btn-hover-border: #544B42;
  --social-bg: #332E29;
  --social-hover-bg: #443C35;
  --shadow: rgba(0,0,0,0.3);
  --shadow-hover: rgba(0,0,0,0.5);
  --shadow-btn: rgba(0,0,0,0.2);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  background-color: var(--bg);
  color: var(--color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* ── 主题切换按钮 ── */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--color-link);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-speed);
  z-index: 100;
}

.theme-toggle:hover {
  color: var(--color-link-hover);
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow-btn);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: opacity 0.3s, transform 0.3s;
}

.icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.dark .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

.dark .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

/* ── 头像区域 ── */
.avatar-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 12vh;
  padding-bottom: 20px;
}

.avatar-wrapper {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 4px 24px var(--shadow);
  transition: box-shadow 0.4s;
}

.avatar-wrapper:hover {
  box-shadow: 0 6px 32px var(--shadow-hover);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.greeting {
  margin-top: 18px;
  font-size: 20px;
  font-weight: 600;
  background: linear-gradient(90deg, #FF6B6B, #FFD93D, #6BCB77, #4D96FF, #9B59B6, #FF6B6B);
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: rainbow 3s linear infinite;
}

@keyframes rainbow {
  0% { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}

/* ── 社交框 ── */
.social-section {
  padding: 0 16px;
  margin-bottom: 16px;
}

.social-container {
  max-width: 680px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 14px 8px;
  transition: background var(--transition-speed), border-color var(--transition-speed);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--social-bg);
  color: var(--color-link);
  transition: all 0.25s ease;
}

.social-links a:hover {
  background: var(--social-hover-bg);
  color: var(--color-link-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow-btn);
}

.social-links svg {
  width: 20px;
  height: 20px;
}

/* ── 导航 ── */
nav {
  padding: 0 16px;
  margin-bottom: 16px;
}

.nav-container {
  max-width: 680px;
  margin: 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 14px 8px;
  transition: background var(--transition-speed), border-color var(--transition-speed);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--color-link);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: var(--btn-bg);
  white-space: nowrap;
  transition: all 0.25s ease;
}

.nav-links a svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.nav-links a:hover {
  color: var(--color-link-hover);
  background: var(--btn-hover-bg);
  border-color: var(--btn-hover-border);
  transform: translateY(-1px);
  box-shadow: 0 2px 10px var(--shadow-btn);
}

.nav-links a.rainbow-card {
  color: #fff !important;
  border-color: transparent !important;
  background: linear-gradient(90deg, #FF6B6B, #FFD93D, #6BCB77, #4D96FF, #9B59B6, #FF6B6B);
  background-size: 300% 100%;
  animation: rainbow 3s linear infinite;
}

.nav-links a.rainbow-card:hover {
  filter: brightness(1.1);
}

/* ── 主体 ── */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
}

.hero {
  text-align: center;
  max-width: 480px;
}

.hero p {
  font-size: 16px;
  color: var(--color-secondary);
  line-height: 1.6;
}

/* ── 底部 ── */
footer {
  text-align: center;
  padding: 20px;
  font-size: 13px;
  color: var(--color-muted);
}

.icp {
  margin-top: 4px;
}

.icp a {
  text-decoration: none;
  color: var(--color-muted);
  font-size: 12px;
  transition: color 0.2s;
}

.icp a:hover {
  color: var(--color-secondary);
}