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

:root {
  --primary: #6C5CE7;
  --primary-light: #A29BFE;
  --accent: #FD79A8;
  --accent-light: #FDCB6E;
  --orange: #E17055;
  --blue: #74B9FF;
  --green: #55EFC4;
  --bg: #F8F7FF;
  --card-bg: #FFFFFF;
  --text: #2D3436;
  --text-light: #636E72;
  --text-lighter: #B2BEC3;
  --border: #DFE6E9;
  --shadow: 0 4px 20px rgba(108, 92, 231, 0.10);
  --shadow-hover: 0 8px 30px rgba(108, 92, 231, 0.18);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

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

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

/* === Navbar === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(108, 92, 231, 0.08);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(108, 92, 231, 0.10);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 10px;
  font-size: 1rem;
  animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1) rotate(5deg); }
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2.5px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  transition: width var(--transition);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* === Hero === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  background: linear-gradient(135deg, #F8F7FF 0%, #FFF0F5 40%, #F0F4FF 70%, #FFF9F0 100%);
}

.hero-bg-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.4;
  filter: blur(60px);
  animation: shapeFloat 8s ease-in-out infinite;
}

.shape-1 {
  width: 300px;
  height: 300px;
  background: var(--primary-light);
  top: 10%;
  left: -5%;
  animation-delay: 0s;
}

.shape-2 {
  width: 250px;
  height: 250px;
  background: var(--accent);
  top: 50%;
  right: -5%;
  animation-delay: -3s;
}

.shape-3 {
  width: 200px;
  height: 200px;
  background: var(--accent-light);
  bottom: 10%;
  left: 30%;
  animation-delay: -5s;
}

@keyframes shapeFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  33% { transform: translateY(-25px) scale(1.05); }
  66% { transform: translateY(15px) scale(0.95); }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
}

.title-line {
  display: block;
  color: var(--text);
}

.title-line.accent {
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--orange));
  color: #fff;
  font-size: 2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.3);
  animation: avatarFloat 3s ease-in-out infinite;
}

@keyframes avatarFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 480px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 56px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-lighter);
  font-weight: 500;
}

/* === Section Common === */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.section-desc {
  color: var(--text-light);
  font-size: 1rem;
}

/* === Articles Section === */
.articles-section {
  padding: 80px 0;
}

/* Category Filters */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}

.cat-btn {
  padding: 8px 22px;
  border: 2px solid var(--border);
  border-radius: 50px;
  background: var(--card-bg);
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.cat-btn:hover {
  border-color: var(--primary-light);
  color: var(--primary);
}

.cat-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.3);
}

/* Search Bar */
.search-bar {
  position: relative;
  max-width: 420px;
  margin: 0 auto 40px;
}

.search-bar input {
  width: 100%;
  padding: 14px 48px 14px 20px;
  border: 2px solid var(--border);
  border-radius: 50px;
  font-size: 0.95rem;
  background: var(--card-bg);
  color: var(--text);
  outline: none;
  transition: var(--transition);
}

.search-bar input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.08);
}

.search-bar input::placeholder {
  color: var(--text-lighter);
}

.search-icon {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  pointer-events: none;
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.article-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--orange));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.article-card:hover::before {
  transform: scaleX(1);
}

.article-card .card-category {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.cat-study { background: #E8F5FD; color: #3B82F6; }
.cat-exam  { background: #FFF0F0; color: #EF4444; }
.cat-life   { background: #F0FFF4; color: #10B981; }
.cat-reading { background: #FFF9EB; color: #F59E0B; }
.cat-mood   { background: #F5F0FF; color: #8B5CF6; }

.article-card .card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card .card-excerpt {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.article-card .card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-lighter);
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.article-card .card-meta .meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-lighter);
}

.card-arrow {
  position: absolute;
  bottom: 28px;
  right: 28px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  opacity: 0;
  transform: translateX(-8px);
  transition: var(--transition);
}

.article-card:hover .card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* 卡片点赞/分享按钮 */
.btn-like-card, .btn-share-card {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-lighter);
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 6px;
  border-radius: 20px;
  transition: var(--transition);
}

.btn-like-card:hover { color: #EF4444; background: #FFF0F0; }
.btn-like-card.liked { color: #EF4444; }
.btn-like-card .heart-icon { transition: transform 0.3s; }
.btn-like-card:hover .heart-icon { transform: scale(1.2); }
.btn-like-card:active .heart-icon { transform: scale(1.5); }

.btn-share-card:hover { color: var(--primary); background: #F0EEFF; }

/* Load More */
.load-more-wrap {
  text-align: center;
  margin-top: 48px;
}

.btn-load-more {
  padding: 12px 40px;
  border: 2px solid var(--primary);
  border-radius: 50px;
  background: transparent;
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-load-more:hover {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  transform: translateY(20px);
  transition: transform var(--transition);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: sticky;
  top: 16px;
  float: right;
  z-index: 10;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  margin-right: 16px;
}

.modal-close:hover {
  background: var(--accent);
  color: #fff;
}

.modal-body {
  padding: 32px 36px 40px;
}

.modal-body .modal-category {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.modal-body .modal-title {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text);
}

.modal-body .modal-meta {
  font-size: 0.85rem;
  color: var(--text-lighter);
  margin-bottom: 28px;
  display: flex;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.modal-body .modal-text {
  font-size: 1rem;
  line-height: 2;
  color: var(--text);
}

.modal-body .modal-text p {
  margin-bottom: 16px;
}

/* 弹窗底部操作栏 */
.modal-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.btn-like-modal, .btn-share-modal {
  padding: 10px 20px;
  border: 2px solid var(--border);
  border-radius: 50px;
  background: var(--card-bg);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-like-modal:hover { border-color: #EF4444; color: #EF4444; background: #FFF0F0; }
.btn-like-modal.liked { border-color: #EF4444; color: #EF4444; background: #FFF0F0; }
.btn-like-modal .heart-icon { transition: transform 0.3s; }
.btn-like-modal:hover .heart-icon { transform: scale(1.2); }
.btn-like-modal:active .heart-icon { transform: scale(1.5); }

.btn-share-modal:hover { border-color: var(--primary); color: var(--primary); background: #F0EEFF; }

/* Toast 提示 */
.card-toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #2D3436;
  color: #fff;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
}
.card-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* === About Section === */
.about-section {
  padding: 80px 0 100px;
  text-align: center;
}

.about-profile {
  max-width: 500px;
  margin: 0 auto 48px;
}

.about-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent), var(--orange));
  color: #fff;
  font-size: 1.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 6px 24px rgba(108, 92, 231, 0.25);
}

.about-profile h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.about-bio {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.8;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  margin-top: 48px;
}

.about-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.about-icon {
  font-size: 2.8rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.about-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* === Footer === */
.footer {
  background: linear-gradient(135deg, #2D3436, #3D3D5C);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 48px 24px;
}

.footer-text {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.footer-sub {
  font-size: 0.85rem;
}

.footer-icp {
  margin-top: 8px;
  font-size: 0.78rem;
}
.footer-icp a {
  color: rgba(255, 255, 255, 0.4);
  transition: var(--transition);
}
.footer-icp a:hover {
  color: rgba(255, 255, 255, 0.7);
}

/* === No Results === */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-lighter);
}

.no-results .no-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.no-results p {
  font-size: 1rem;
}

/* === Responsive === */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    padding: 24px;
    gap: 20px;
    text-align: center;
    transform: translateY(-120%);
    transition: transform var(--transition);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .menu-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 20px;
    flex-wrap: wrap;
  }

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

  .modal-body {
    padding: 24px 20px 32px;
  }

  .modal-body .modal-title {
    font-size: 1.3rem;
  }

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