/* ============================================
   阵列 - 苹果风格简约设计
   ============================================ */

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #0071e3;
  --primary-hover: #0077ed;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f7;
  --border: #d2d2d7;
  --shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

/* ============================================
   页眉
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 21px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  color: var(--text-primary);
  opacity: 0.8;
  font-weight: 400;
}

.nav-link:hover {
  opacity: 1;
  color: var(--primary);
}

.header-actions {
  position: relative;
}

/* 登录按钮 */
.login-btn {
  padding: 8px 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 980px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.login-btn:hover {
  background: var(--primary-hover);
  transform: scale(1.02);
}

/* 用户菜单 */
.user-menu-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: none;
  border-radius: 980px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.user-menu-btn:hover {
  background: #e8e8ed;
}

.user-menu-btn .arrow {
  font-size: 10px;
  opacity: 0.6;
  transition: transform 0.2s ease;
}

.user-menu-btn.active .arrow {
  transform: rotate(180deg);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 220px;
  background: var(--bg-primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: none;
  overflow: hidden;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.user-dropdown.show {
  display: block;
}

.user-dropdown-header {
  padding: 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.user-dropdown-header .nickname {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.user-dropdown-header .date {
  font-size: 12px;
  color: var(--text-secondary);
}

.user-dropdown-item {
  display: block;
  width: 100%;
  padding: 12px 16px;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
}

.user-dropdown-item:hover {
  background: var(--bg-secondary);
}

.user-dropdown-item.logout {
  color: #ff3b30;
  border-top: 1px solid var(--border);
}

/* ============================================
   主内容区
   ============================================ */
.main {
  padding-top: 52px;
}

/* Hero区域 */
.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  text-align: center;
  padding: 80px 24px;
}

.hero-content {
  max-width: 800px;
}

.hero-title {
  font-size: clamp(40px, 8vw, 64px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(18px, 3vw, 24px);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
}

/* 通用区块 */
.section {
  padding: 80px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-gray {
  background: var(--bg-secondary);
  max-width: none;
  padding-left: 24px;
  padding-right: 24px;
}

.section-gray > * {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 40px;
}

/* ============================================
   工具区
   ============================================ */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

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

.tool-card.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.tool-card.disabled:hover {
  transform: none;
  box-shadow: var(--shadow);
}

.tool-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--primary);
}

.tool-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tool-desc {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============================================
   推荐链接
   ============================================ */
.links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.link-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}

.link-item:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.link-item svg {
  flex-shrink: 0;
}

/* ============================================
   关于区
   ============================================ */
.about-content {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 40px;
  max-width: 800px;
}

.about-content p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-secondary);
  padding: 24px;
  border-top: 1px solid var(--border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-secondary);
}

.footer-beian a {
  color: var(--text-secondary);
}

.footer-beian a:hover {
  color: var(--primary);
}

.footer-stats {
  font-variant-numeric: tabular-nums;
}

/* ============================================
   登录模态框
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 200;
  padding: 24px;
}

.modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius);
  width: 380px;
  max-width: 100%;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  padding: 20px 24px;
  background: var(--bg-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
  padding: 4px;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 28px 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 16px;
  transition: var(--transition);
  background: var(--bg-primary);
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.1);
}

.form-submit {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.form-submit:hover {
  background: var(--primary-hover);
}

.form-submit:disabled {
  background: var(--border);
  cursor: not-allowed;
}

.form-tip {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

.form-error {
  color: #ff3b30;
  font-size: 13px;
  margin-top: 12px;
  text-align: center;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .hero {
    min-height: 60vh;
    padding: 60px 20px;
  }

  .section {
    padding: 60px 20px;
  }

  .section-title {
    font-size: 28px;
  }

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

  .about-content {
    padding: 28px;
  }

  .footer-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}