/* ==========================================================================
   CSS 变量与主题设计系统 (Apple & Notion Minimalist Aesthetic)
   ========================================================================== */
:root[data-theme="light"] {
  --bg-primary: #fcfcfc;
  --bg-secondary: #f4f4f5;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.18);
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-tertiary: #9ca3af;
  --accent-color: #0f172a;
  --chip-bg: #f3f4f6;
  --chip-hover: #e5e7eb;
  --badge-success-bg: #ecfdf5;
  --badge-success-text: #059669;
  --badge-info-bg: #eff6ff;
  --badge-info-text: #2563eb;
  --badge-neutral-bg: #f3f4f6;
  --badge-neutral-text: #4b5563;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-hover: 0 10px 25px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
}

:root[data-theme="dark"] {
  --bg-primary: #0a0a0c;
  --bg-secondary: #141418;
  --bg-card: #121216;
  --bg-card-hover: #18181f;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --accent-color: #f9fafb;
  --chip-bg: #1c1c22;
  --chip-hover: #26262e;
  --badge-success-bg: rgba(5, 150, 105, 0.15);
  --badge-success-text: #34d399;
  --badge-info-bg: rgba(37, 99, 235, 0.15);
  --badge-info-text: #60a5fa;
  --badge-neutral-bg: rgba(255, 255, 255, 0.08);
  --badge-neutral-text: #9ca3af;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 10px 25px -3px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   全局重置与排版
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   容器布局
   ========================================================================== */
.page-wrapper {
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

@media (min-width: 768px) {
  .page-wrapper {
    padding: 4.5rem 1.5rem 5rem;
  }
}

/* ==========================================================================
   顶部导航 (Header & Theme Toggle)
   ========================================================================== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 3.5rem;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background-color: var(--chip-bg);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
  position: relative;
}

.status-dot::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: inherit;
  animation: pulse 2s infinite ease-out;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(2.6); opacity: 0; }
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--chip-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  background-color: var(--chip-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: scale(1.05);
}

/* 根据主题切换图标显示 */
[data-theme="light"] .moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }

/* ==========================================================================
   个人介绍区 (Hero Section)
   ========================================================================== */
.hero-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.avatar-container {
  width: 76px;
  height: 76px;
}

.avatar-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

:root[data-theme="dark"] .avatar-placeholder {
  background: linear-gradient(135deg, #f3f4f6 0%, #d1d5db 100%);
}

.avatar-placeholder span {
  font-size: 2rem;
  font-weight: 700;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", sans-serif;
}

:root[data-theme="dark"] .avatar-placeholder span {
  color: #111827;
}

.avatar-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.hero-name {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.2;
}

.hero-role {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.hero-bio {
  font-size: 1.025rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
  margin-top: 0.5rem;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-top: 0.75rem;
}

.hero-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  background-color: var(--chip-bg);
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.hero-chip:hover {
  background-color: var(--chip-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

/* ==========================================================================
   区块通用样式 (Section Styles)
   ========================================================================== */
.section {
  margin-bottom: 3.5rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   精选项目卡片 (Projects Grid)
   ========================================================================== */
.projects-grid {
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.35rem 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  background-color: var(--bg-card-hover);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.project-title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text-primary);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.badge-success {
  background-color: var(--badge-success-bg);
  color: var(--badge-success-text);
}

.badge-info {
  background-color: var(--badge-info-bg);
  color: var(--badge-info-text);
}

.badge-neutral {
  background-color: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
}

.project-description {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  background-color: var(--chip-bg);
  color: var(--text-secondary);
  border-radius: 5px;
}

.project-actions {
  display: flex;
  margin-top: 0.25rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  opacity: 0.85;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.project-link:hover {
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   联系方式区 (Contact Cards)
   ========================================================================== */
.contact-intro {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.65;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

a.contact-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  background-color: var(--bg-card-hover);
}

.contact-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background-color: var(--chip-bg);
  color: var(--text-primary);
  flex-shrink: 0;
}

.contact-card-details {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.contact-card-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--text-tertiary);
  letter-spacing: 0.05em;
}

.contact-card-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-card-arrow {
  color: var(--text-tertiary);
  transition: transform 0.2s ease, color 0.2s ease;
}

a.contact-card:hover .contact-card-arrow {
  color: var(--text-primary);
  transform: translateX(3px);
}

/* 复制按钮 */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  border-radius: 8px;
  background-color: var(--chip-bg);
  border: 1px solid var(--border-color);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background-color: var(--chip-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.copy-btn.copied {
  background-color: var(--badge-success-bg);
  color: var(--badge-success-text);
  border-color: transparent;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.site-footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  text-align: center;
}

@media (min-width: 640px) {
  .site-footer {
    flex-direction: row;
    justify-content: space-between;
  }
}