/* ============ 基础样式 ============ */
:root {
  --primary: #5B6ABF;
  --primary-dark: #4A56A0;
  --primary-light: #7B8AD4;
  --secondary: #E8845C;
  --bg: #F5F0EB;
  --card-bg: #FEFCF9;
  --text: #3A3535;
  --text-light: #7A7268;
  --border: #E6DED5;
  --shadow: 0 2px 12px rgba(60,50,40,0.07), 0 1px 3px rgba(60,50,40,0.05);
  --shadow-hover: 0 8px 25px rgba(60,50,40,0.12), 0 2px 6px rgba(60,50,40,0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --gradient: linear-gradient(135deg, #5B6ABF 0%, #E8845C 100%);
  --gradient-warm: linear-gradient(135deg, #E8845C 0%, #F2C879 100%);
  --gradient-cool: linear-gradient(135deg, #5B6ABF 0%, #7EC8E3 100%);
  --success: #6BAF7B;
  --warning: #E8B84C;
  --danger: #D46B5C;
  --paper: #FBF7F2;
  --paper-lines: #EDE6DB;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(91,106,191,0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(232,132,92,0.03) 0%, transparent 50%);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ 导航栏 ============ */
.navbar {
  background: rgba(254,252,249,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 1px 8px rgba(60,50,40,0.06);
  border-bottom: 1px solid rgba(230,222,213,0.5);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 65px;
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.02em;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 5px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  transition: all 0.3s;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(91,106,191,0.08);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(91,106,191,0.1);
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 65px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 10px;
    box-shadow: var(--shadow);
  }
  .nav-menu.show { display: flex; }
  .nav-link { padding: 12px 16px; }
}

/* ============ 首页 Hero ============ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #4A567A 0%, #6B5B7B 40%, #8B6F6F 100%);
  position: relative;
  overflow: hidden;
  padding-top: 65px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 50%);
  animation: float 15s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-content {
  text-align: center;
  color: white;
  position: relative;
  z-index: 1;
  padding: 40px 20px;
}

.graduation-badge {
  font-size: 5rem;
  margin-bottom: 20px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 15px;
  text-shadow: 2px 2px 10px rgba(0,0,0,0.2);
}

.hero-subtitle {
  font-size: 1.4rem;
  opacity: 0.9;
  margin-bottom: 30px;
}

.graduation-notice {
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  border-radius: 50px;
  padding: 15px 30px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 40px;
  border: 1px solid rgba(255,255,255,0.3);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,255,255,0.4); }
  50% { box-shadow: 0 0 0 15px rgba(255,255,255,0); }
}

.notice-icon { font-size: 1.5rem; }
.notice-text { font-size: 1.2rem; font-weight: 600; }
.notice-days { font-size: 1rem; opacity: 0.9; }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 50px;
  margin-bottom: 40px;
}

.stat-item { text-align: center; }
.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
}
.stat-label {
  font-size: 0.95rem;
  opacity: 0.8;
}

.hero-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1.1rem; }
  .hero-stats { gap: 30px; }
  .stat-number { font-size: 2rem; }
}

/* ============ 按钮 ============ */
.btn {
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(91,106,191,0.25);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(91,106,191,0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.2);
  color: white;
  border: 1.5px solid rgba(255,255,255,0.4);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.3);
  border-color: rgba(255,255,255,0.6);
}

.btn-small {
  padding: 6px 14px;
  font-size: 0.82rem;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover {
  background: #C05A4C;
}

.btn-ghost {
  background: transparent;
  color: var(--text-light);
  padding: 6px 12px;
  font-size: 0.82rem;
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: rgba(0,0,0,0.04);
  color: var(--text);
}

/* ============ 区块 ============ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
  letter-spacing: -0.01em;
}

.page {
  display: none;
  min-height: 100vh;
  padding-top: 85px;
  padding-bottom: 40px;
}

.page.active { display: block; }
#page-home.active { display: block; padding-top: 0; }

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 30px;
}

.page-header h1 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.search-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.search-bar input {
  padding: 10px 18px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  width: 280px;
  transition: border-color 0.2s;
  background: var(--card-bg);
}

.search-bar input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91,106,191,0.1);
}

/* ============ 同学卡片网格 ============ */
.classmate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.classmate-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(230,222,213,0.4);
}

.classmate-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-warm);
  opacity: 0.7;
}

.classmate-card:hover {
  transform: translateY(-3px) rotate(-0.5deg);
  box-shadow: var(--shadow-hover);
}

.classmate-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 12px;
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: white;
  font-weight: 700;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(232,132,92,0.2);
}

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

.classmate-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.classmate-info {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.classmate-motto {
  color: var(--secondary);
  font-style: italic;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  font-size: 0.85rem;
}

.classmate-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ============ 留言板 ============ */
.message-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  gap: 14px;
  border: 1px solid rgba(230,222,213,0.4);
  transition: all 0.2s ease;
  position: relative;
}

.message-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-cool);
  opacity: 0;
  transition: opacity 0.2s;
}

.message-card:hover::after {
  opacity: 0.6;
}

.message-card:hover {
  box-shadow: var(--shadow-hover);
}

.message-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-cool);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: white;
  flex-shrink: 0;
}

.message-body { flex: 1; }

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.message-author {
  font-weight: 700;
  font-size: 0.95rem;
}

.message-time {
  color: var(--text-light);
  font-size: 0.8rem;
}

.message-content {
  color: var(--text);
  line-height: 1.75;
  white-space: pre-wrap;
  font-size: 0.95rem;
}

.message-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(230,222,213,0.3);
}

.msg-like-btn {
  background: none;
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-light);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.msg-like-btn:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(232,132,92,0.06);
}

.msg-like-btn.liked {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(232,132,92,0.08);
}

.message-preview .message-card {
  border-left: 3px solid var(--primary);
}

/* ============ 相册 ============ */
.photo-grid {
  columns: 3;
  column-gap: 18px;
}

.photo-card {
  break-inside: avoid;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  margin-bottom: 18px;
  border: 1px solid rgba(230,222,213,0.4);
  display: inline-block;
  width: 100%;
}

.photo-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.photo-card-img {
  cursor: pointer;
  overflow: hidden;
}

.photo-card-img img {
  width: 100%;
  display: block;
  transition: transform 0.4s ease;
}

.photo-card:hover .photo-card-img img {
  transform: scale(1.03);
}

.photo-card-body {
  padding: 14px;
}

.photo-card-title {
  font-weight: 600;
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.photo-card-desc {
  color: var(--text-light);
  font-size: 0.82rem;
  line-height: 1.5;
}

.photo-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--text-light);
}

/* 照片交互按钮 */
.photo-card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(230,222,213,0.3);
}

.photo-action-btn {
  background: none;
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-light);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  line-height: 1;
}

.photo-action-btn:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  background: rgba(232,132,92,0.06);
}

.photo-action-btn.liked {
  border-color: #E25555;
  color: #E25555;
  background: rgba(226,85,85,0.06);
}

.photo-action-btn .like-icon {
  font-size: 0.9rem;
  transition: transform 0.2s;
}

.photo-delete-btn {
  margin-left: auto;
  border-color: transparent;
  opacity: 0.4;
}

.photo-delete-btn:hover {
  opacity: 1;
  border-color: var(--danger);
  background: rgba(212,107,92,0.06);
}

/* 评论区 */
.photo-comments-section {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}

.comments-list {
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 8px;
}

.comment-item {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 0;
  font-size: 0.82rem;
  border-bottom: 1px solid rgba(230,222,213,0.2);
  position: relative;
}

.comment-item:last-child {
  border-bottom: none;
}

.comment-author {
  font-weight: 600;
  color: var(--primary);
  white-space: nowrap;
  font-size: 0.82rem;
}

.comment-text {
  color: var(--text);
  flex: 1;
  word-break: break-all;
}

.comment-time {
  color: var(--text-light);
  font-size: 0.72rem;
  white-space: nowrap;
}

.comment-delete {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 1rem;
  opacity: 0;
  transition: opacity 0.2s;
  padding: 0 4px;
}

.comment-item:hover .comment-delete {
  opacity: 0.6;
}

.comment-delete:hover {
  opacity: 1 !important;
  color: var(--danger);
}

.comments-empty {
  text-align: center;
  color: var(--text-light);
  font-size: 0.82rem;
  padding: 10px 0;
  font-style: italic;
}

.comment-input-row {
  display: flex;
  gap: 6px;
  align-items: center;
}

.comment-input {
  padding: 6px 10px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  background: var(--paper);
  transition: border-color 0.2s;
  font-family: inherit;
}

.comment-input:focus {
  outline: none;
  border-color: var(--primary);
}

.comment-input:first-child {
  width: 80px;
  flex-shrink: 0;
}

.comment-text-input {
  flex: 1;
  min-width: 0;
}

.comment-send-btn {
  padding: 6px 12px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: background 0.2s;
}

.comment-send-btn:hover {
  background: var(--primary-dark);
}

@media (max-width: 768px) {
  .photo-grid {
    columns: 2;
    column-gap: 12px;
  }
}

@media (max-width: 480px) {
  .photo-grid {
    columns: 1;
  }
}

.photo-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.photo-preview-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  height: 140px;
}

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

.photo-preview-item:hover img {
  transform: scale(1.06);
}

/* ============ 时间线 ============ */
.timeline {
  position: relative;
  padding: 20px 0;
  max-width: 700px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--border) 0px,
    var(--border) 6px,
    transparent 6px,
    transparent 12px
  );
}

.timeline-item {
  position: relative;
  padding: 10px 0 20px 56px;
}

.timeline-dot {
  position: absolute;
  left: 16px;
  top: 18px;
  width: 18px;
  height: 18px;
  background: var(--secondary);
  border-radius: 50%;
  border: 3px solid var(--card-bg);
  box-shadow: 0 0 0 2px var(--secondary);
  z-index: 1;
}

.timeline-item:nth-child(even) .timeline-dot {
  background: var(--primary);
  box-shadow: 0 0 0 2px var(--primary);
}

.timeline-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  border: 1px solid rgba(230,222,213,0.3);
}

.timeline-content:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-hover);
}

.timeline-icon {
  font-size: 1.6rem;
  margin-bottom: 6px;
}

.timeline-date {
  color: var(--secondary);
  font-weight: 600;
  font-size: 0.82rem;
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.timeline-desc {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .timeline { max-width: 100%; }
}

/* ============ 分页 ============ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.pagination button {
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.pagination button:hover,
.pagination button.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ============ 模态框 ============ */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(58,53,53,0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

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

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  animation: modalIn 0.25s ease;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

@keyframes modalIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 15px;
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-light);
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}

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

.modal h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
}

/* ============ 表单 ============ */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
  background: var(--paper);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91,106,191,0.1);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

@media (max-width: 480px) {
  .form-row { grid-template-columns: 1fr; }
}

/* ============ 管理后台 ============ */
.admin-login {
  display: flex;
  justify-content: center;
  padding-top: 50px;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 380px;
  width: 100%;
  border: 1px solid rgba(230,222,213,0.3);
}

.login-card h2 {
  margin-bottom: 25px;
}

.login-card input {
  width: 100%;
  padding: 14px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  margin-bottom: 20px;
  text-align: center;
}

.login-card input:focus {
  outline: none;
  border-color: var(--primary);
}

.admin-panel { padding-top: 10px; }

.admin-section {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border: 1px solid rgba(230,222,213,0.3);
}

.admin-section h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.settings-form .btn {
  margin-top: 10px;
}

/* ============ 图片预览灯箱 ============ */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.9);
  z-index: 3000;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.lightbox.show {
  display: flex;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: var(--radius-sm);
}

/* ============ Toast 提示 ============ */
.toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 4000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--card-bg);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  animation: toastIn 0.25s ease;
  border-left: 3px solid var(--success);
  font-weight: 500;
  font-size: 0.9rem;
}

.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes toastIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ============ 页脚 ============ */
.footer {
  text-align: center;
  padding: 28px;
  color: var(--text-light);
  font-size: 0.85rem;
  background: var(--card-bg);
  margin-top: 40px;
  border-top: 1px solid var(--border);
}

/* ============ 空状态 ============ */
.empty-state {
  text-align: center;
  padding: 50px 20px;
  color: var(--text-light);
}

.empty-state .empty-icon {
  font-size: 3.2rem;
  margin-bottom: 12px;
  opacity: 0.7;
}

.empty-state p {
  font-size: 1rem;
}

/* ============ 深色模式 ============ */
body.dark-mode {
  --bg: #1E1E26;
  --card-bg: #27272F;
  --text: #E0DDD8;
  --text-light: #9A9590;
  --border: #3A3840;
  --shadow: 0 2px 12px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 25px rgba(0,0,0,0.4);
  --paper: #2A2A32;
  --paper-lines: #3A3840;
}

body.dark-mode .navbar {
  background: rgba(30,30,38,0.95);
  border-bottom-color: rgba(58,56,64,0.5);
}

body.dark-mode .nav-toggle { color: #E0DDD8; }

body.dark-mode .modal {
  background: #27272F;
  color: #E0DDD8;
}

body.dark-mode .login-card,
body.dark-mode .admin-section {
  background: #27272F;
}

body.dark-mode .footer {
  background: #1A1A22;
  color: #9A9590;
}

body.dark-mode .pagination button {
  background: #27272F;
  color: #E0DDD8;
  border-color: #3A3840;
}

body.dark-mode .form-group input,
body.dark-mode .form-group textarea,
body.dark-mode .form-group select {
  background: #1E1E26;
  color: #E0DDD8;
  border-color: #3A3840;
}

body.dark-mode .toast {
  background: #27272F;
  color: #E0DDD8;
}

body.dark-mode .timeline-content {
  background: #27272F;
}

body.dark-mode .timeline-dot {
  border-color: #27272F;
}

body.dark-mode .hero::before {
  background: radial-gradient(circle, rgba(255,255,255,0.04) 0%, transparent 50%);
}

body.dark-mode .comment-input {
  background: #1E1E26;
  color: #E0DDD8;
  border-color: #3A3840;
}

body.dark-mode .photo-comments-section {
  border-top-color: #3A3840;
}

body.dark-mode .photo-card-actions {
  border-top-color: #3A3840;
}

body.dark-mode .photo-action-btn {
  border-color: #3A3840;
}

body.dark-mode .msg-like-btn {
  border-color: #3A3840;
}

body.dark-mode .message-card {
  border-color: rgba(58,56,64,0.4);
}

body.dark-mode .classmate-card {
  border-color: rgba(58,56,64,0.4);
}

body.dark-mode .wish-card {
  border-color: rgba(58,56,64,0.3);
}

body.dark-mode .photo-card {
  border-color: rgba(58,56,64,0.4);
}

/* ============ 主题切换按钮 ============ */
.theme-toggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 50%;
  transition: all 0.3s;
  line-height: 1;
}

.theme-toggle:hover {
  background: var(--bg);
  transform: rotate(30deg);
}

/* ============ 粒子画布 ============ */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* ============ 彩纸画布 ============ */
#confettiCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5000;
}

/* ============ 音乐播放器 ============ */
.music-player {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1500;
}

.music-player-toggle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 3px 12px rgba(91,106,191,0.3);
  transition: all 0.25s;
  position: relative;
  z-index: 2;
}

.music-player-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(91,106,191,0.4);
}

.music-player-toggle.playing {
  animation: musicPulse 1.5s ease-in-out infinite;
}

@keyframes musicPulse {
  0%, 100% { box-shadow: 0 3px 12px rgba(91,106,191,0.3); }
  50% { box-shadow: 0 3px 20px rgba(91,106,191,0.5), 0 0 30px rgba(91,106,191,0.2); }
}

.music-icon {
  font-size: 1.5rem;
  transition: transform 0.3s;
}

.music-player-toggle.playing .music-icon {
  animation: musicSpin 3s linear infinite;
}

@keyframes musicSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.music-player-panel {
  position: absolute;
  bottom: 65px;
  right: 0;
  width: 300px;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-hover);
  display: none;
  animation: slideUp 0.3s ease;
}

.music-player-panel.show {
  display: block;
}

@keyframes slideUp {
  from { transform: translateY(10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.music-info {
  text-align: center;
  margin-bottom: 15px;
}

.music-title {
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.music-artist {
  color: var(--text-light);
  font-size: 0.85rem;
}

.music-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  cursor: pointer;
  margin-bottom: 8px;
  overflow: hidden;
}

.music-progress {
  height: 100%;
  background: var(--gradient);
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}

.music-time {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 15px;
}

.music-controls {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 15px;
}

.music-controls button {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
  transition: all 0.2s;
}

.music-controls button:hover {
  background: var(--bg);
  transform: scale(1.15);
}

.music-volume {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
}

.music-volume input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

.music-volume input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

/* ============ 祝福墙 ============ */
.wish-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}

.wish-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(230,222,213,0.3);
}

.wish-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.wish-card:hover {
  transform: translateY(-3px) rotate(-0.5deg);
  box-shadow: var(--shadow-hover);
}

.wish-content {
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 12px;
  white-space: pre-wrap;
}

.wish-author {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-light);
}

.wish-author-name {
  font-weight: 600;
  color: var(--primary);
}

.wish-delete {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.8rem;
  opacity: 0;
  transition: opacity 0.2s;
}

.wish-card:hover .wish-delete {
  opacity: 1;
}

.wish-stars {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 1.2rem;
  opacity: 0.2;
}

/* ============ 滚动动画 ============ */
.scroll-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-animate.delay-1 { transition-delay: 0.1s; }
.scroll-animate.delay-2 { transition-delay: 0.2s; }
.scroll-animate.delay-3 { transition-delay: 0.3s; }
.scroll-animate.delay-4 { transition-delay: 0.4s; }

/* ============ 打字光标 ============ */
.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.2em;
  background: white;
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: blink 0.8s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ============ 随机同学弹窗 ============ */
.random-result {
  text-align: center;
  padding: 20px;
}

.random-result .classmate-avatar {
  width: 120px;
  height: 120px;
  font-size: 3rem;
  margin: 0 auto 20px;
  animation: popIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes popIn {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

.random-result h2 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.random-result .motto {
  color: var(--primary);
  font-style: italic;
  font-size: 1.1rem;
  margin-top: 10px;
}

/* ============ Emoji 选择器 ============ */
.emoji-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
  padding: 10px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  max-height: 150px;
  overflow-y: auto;
}

.emoji-item {
  font-size: 1.5rem;
  cursor: pointer;
  padding: 5px;
  border-radius: 8px;
  transition: all 0.2s;
  border: none;
  background: none;
}

.emoji-item:hover {
  background: var(--card-bg);
  transform: scale(1.2);
}

/* ============ 照片幻灯片 ============ */
.slideshow-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.95);
  z-index: 3000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

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

.slideshow-img {
  max-width: 85%;
  max-height: 75vh;
  border-radius: var(--radius-sm);
  transition: opacity 0.5s ease;
}

.slideshow-controls {
  display: flex;
  gap: 20px;
  margin-top: 20px;
}

.slideshow-controls button {
  background: rgba(255,255,255,0.15);
  border: none;
  color: white;
  font-size: 1.3rem;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  backdrop-filter: blur(8px);
}

.slideshow-controls button:hover {
  background: rgba(255,255,255,0.25);
}

.slideshow-close {
  position: absolute;
  top: 20px;
  right: 30px;
  background: none;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
}

.slideshow-title {
  color: white;
  font-size: 1.2rem;
  margin-top: 15px;
  text-align: center;
}

@media (max-width: 768px) {
  .wish-wall { grid-template-columns: 1fr; }
  .music-player-panel { width: 260px; right: -10px; }
  .slideshow-img { max-width: 95%; }
}

/* ============ 时光胶囊 ============ */
.capsule-intro {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 28px;
  text-align: center;
  font-style: italic;
}

.capsule-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.capsule-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: all 0.25s ease;
  border: 1px solid rgba(230,222,213,0.3);
}

.capsule-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.capsule-locked {
  background: linear-gradient(135deg, var(--card-bg) 0%, rgba(91,106,191,0.04) 100%);
}

.capsule-locked::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-cool);
  opacity: 0.5;
}

.capsule-ready {
  cursor: pointer;
  background: linear-gradient(135deg, var(--card-bg) 0%, rgba(232,132,92,0.06) 100%);
  border-color: rgba(232,132,92,0.2);
}

.capsule-ready::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-warm);
}

.capsule-ready:hover {
  border-color: rgba(232,132,92,0.4);
}

.capsule-opened {
  background: var(--card-bg);
}

.capsule-opened::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--success);
  opacity: 0.6;
}

.capsule-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--success);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.capsule-ready-badge {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 10px;
  animation: capsuleGlow 2s ease-in-out infinite;
}

@keyframes capsuleGlow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.capsule-lock-icon {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 12px;
  opacity: 0.7;
}

.capsule-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.capsule-author {
  font-weight: 700;
  font-size: 0.95rem;
}

.capsule-date {
  font-size: 0.82rem;
  color: var(--text-light);
}

.capsule-countdown {
  text-align: center;
  margin: 14px 0;
}

.countdown-number {
  display: block;
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.countdown-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 4px;
  display: block;
}

.capsule-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin: 10px 0;
}

.capsule-progress {
  height: 100%;
  background: var(--gradient-cool);
  border-radius: 2px;
  transition: width 0.5s ease;
}

.capsule-mystery {
  text-align: center;
  color: var(--text-light);
  font-size: 0.85rem;
  font-style: italic;
  margin-top: 8px;
}

.capsule-tap {
  text-align: center;
  color: var(--secondary);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 14px 0;
  animation: capsuleGlow 2s ease-in-out infinite;
}

.capsule-content {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
  white-space: pre-wrap;
  margin-bottom: 10px;
}

.capsule-reveal {
  animation: capsuleReveal 0.6s ease-out;
}

@keyframes capsuleReveal {
  from {
    opacity: 0;
    transform: translateY(10px);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

.capsule-opening {
  animation: capsuleOpen 0.8s ease;
}

@keyframes capsuleOpen {
  0% { transform: scale(1); }
  30% { transform: scale(1.05) rotate(1deg); }
  60% { transform: scale(0.98) rotate(-1deg); }
  100% { transform: scale(1) rotate(0deg); }
}

.capsule-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(230,222,213,0.2);
}

.capsule-created {
  font-size: 0.78rem;
  color: var(--text-light);
}

.capsule-date-hints {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.date-hint-btn {
  padding: 5px 12px;
  border: 1.5px solid var(--border);
  background: var(--paper);
  border-radius: 20px;
  font-size: 0.82rem;
  cursor: pointer;
  color: var(--text-light);
  transition: all 0.2s;
}

.date-hint-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(91,106,191,0.06);
}

.modal-hint {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 18px;
  font-style: italic;
}

@media (max-width: 768px) {
  .capsule-wall { grid-template-columns: 1fr; }
}

/* ============ 点击放大涟漪特效 ============ */
.magnify-ripple {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 6000;
  overflow: hidden;
  box-shadow: 0 0 20px rgba(108, 99, 255, 0.5), 0 0 40px rgba(108, 99, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.6);
  animation: magnifyExpand 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.magnify-ripple::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 99, 255, 0.15) 0%, transparent 70%);
  animation: magnifyGlow 0.8s ease-out forwards;
}

@keyframes magnifyExpand {
  0% {
    width: 0;
    height: 0;
    opacity: 1;
    transform: translate(-50%, -50%) scale(0);
  }
  30% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    width: 200px;
    height: 200px;
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.5);
  }
}

@keyframes magnifyGlow {
  0% { opacity: 1; }
  100% { opacity: 0; }
}

/* ============ 3D蛋糕查看器 ============ */
.cake-viewer-container {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
  text-align: center;
}

.cake-viewer-header {
  margin-bottom: 15px;
}

.cake-viewer-header h3 {
  font-size: 1.4rem;
  margin-bottom: 5px;
}

.cake-viewer-header p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

#cakeCanvas {
  width: 100%;
  height: 500px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: grab;
  background: linear-gradient(180deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

#cakeCanvas:active {
  cursor: grabbing;
}

#cakeCanvas canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

@media (max-width: 768px) {
  #cakeCanvas {
    height: 350px;
  }
}