/* ============================================
   个人网站 - 全局样式
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --color-primary: #4f46e5;
  --color-primary-light: #818cf8;
  --color-primary-bg: #eef2ff;
  --color-accent: #0ea5e9;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-border: #e2e8f0;
  --color-divider: #f1f5f9;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  --max-width: 1100px;
  --nav-height: 60px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

.nav-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 99px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-weight: 600;
  margin-left: 4px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-text);
  cursor: pointer;
  padding: 4px;
}

/* ---------- 移动端导航 ---------- */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 8px;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    width: 100%;
  }
}

/* ---------- 页面主体 ---------- */
.main {
  flex: 1;
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.section-header {
  margin-bottom: 32px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
}

/* ---------- Hero 区 ---------- */
.hero {
  position: relative;
  height: 420px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.6));
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
  padding: 24px;
}

.hero-content h1 {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.hero-content p {
  font-size: 18px;
  opacity: 0.9;
  max-width: 560px;
  margin: 0 auto;
}

.hero-placeholder {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.2);
  font-size: 80px;
  font-weight: 800;
  letter-spacing: 4px;
}

/* ---------- 卡片网格 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.25s ease;
  cursor: default;
}

.card-clickable {
  cursor: pointer;
}

.card-clickable:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ---------- 图片网格（图库） ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 1;
  background: var(--color-divider);
  transition: transform 0.2s;
}

.gallery-item:hover {
  transform: scale(1.02);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item .gallery-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 40px 12px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.25s;
}

.gallery-item:hover .gallery-label {
  opacity: 1;
}

.gallery-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-secondary);
}

.gallery-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}

/* ---------- Lightbox ---------- */
.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox.open {
  display: flex;
}

.lightbox img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 40px rgba(0,0,0,0.5);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: rgba(255,255,255,0.15);
  border: none;
  color: #fff;
  font-size: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

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

.lightbox-caption {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: 14px;
  opacity: 0.8;
  max-width: 80%;
  text-align: center;
}

/* ---------- 文件列表 ---------- */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: all 0.2s;
}

.file-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.file-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.file-download {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-size: 13px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
  text-decoration: none;
}

.file-download:hover {
  background: var(--color-primary-light);
  color: #fff;
}

.file-empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-secondary);
}

.file-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}

/* ---------- Todo 清单 ---------- */
.todo-container {
  max-width: 640px;
  margin: 0 auto;
}

.todo-input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
}

.todo-input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
  background: var(--color-surface);
}

.todo-input:focus {
  border-color: var(--color-primary);
}

.todo-btn {
  padding: 12px 22px;
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
  font-family: inherit;
}

.todo-btn:hover {
  background: var(--color-primary-light);
}

.todo-btn-secondary {
  background: var(--color-text-secondary);
}

.todo-btn-secondary:hover {
  background: #475569;
}

.toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.toolbar .todo-btn {
  font-size: 13px;
  padding: 8px 16px;
}

.todo-stats {
  font-size: 13px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  animation: fadeIn 0.2s ease;
}

.todo-item:hover {
  border-color: var(--color-primary-light);
}

.todo-checkbox {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  cursor: pointer;
  flex-shrink: 0;
  appearance: none;
  -webkit-appearance: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  position: relative;
}

.todo-checkbox:checked {
  background: var(--color-success);
  border-color: var(--color-success);
}

.todo-checkbox:checked::after {
  content: "✓";
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.todo-text {
  flex: 1;
  font-size: 15px;
  word-break: break-word;
}

.todo-item.done .todo-text {
  text-decoration: line-through;
  color: var(--color-text-secondary);
}

.todo-delete {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 18px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  opacity: 0.4;
}

.todo-item:hover .todo-delete {
  opacity: 1;
}

.todo-delete:hover {
  color: var(--color-danger);
  background: #fef2f2;
}

.todo-empty {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-secondary);
}

.todo-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.3;
}

.todo-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--color-text);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 999;
  pointer-events: none;
}

.todo-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 24px;
  font-size: 13px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

/* ---------- 动画 ---------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 页面标题小横幅 ---------- */
.page-header {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  padding: 56px 24px 48px;
  text-align: center;
}

.page-header h1 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-header p {
  font-size: 16px;
  opacity: 0.9;
}

.badge-private {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 99px;
  background: rgba(255,255,255,0.2);
  font-weight: 600;
  margin-bottom: 12px;
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }