/* === BASE RESET & VARIABLES === */
:root {
  --bg-deep: #03050a;
  --bg-surface: rgba(12, 19, 36, 0.85);
  --primary: #7bd1fa;
  --primary-dim: rgba(123, 209, 250, 0.3);
  --secondary: #c4c1fb;
  --secondary-dim: rgba(196, 193, 251, 0.3);
  --gold: #fde047;
  --gold-dim: rgba(253, 224, 71, 0.3);
  --text-primary: #dce1fb;
  --text-secondary: rgba(220, 225, 251, 0.7);
  --text-muted: rgba(220, 225, 251, 0.5);
  --border: rgba(123, 209, 250, 0.15);
  --glow-primary: 0 0 20px rgba(123, 209, 250, 0.3), 0 0 40px rgba(123, 209, 250, 0.1);
  --glow-gold: 0 0 20px rgba(253, 224, 71, 0.3), 0 0 40px rgba(253, 224, 71, 0.1);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: 'Noto Sans SC', 'Inter', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
}

/* === CANVAS BACKGROUNDS === */
#starlight-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
}

/* === TOP BAR === */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  background: rgba(3, 5, 10, 0.6);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(123, 209, 250, 0.08);
  z-index: 1000;
}

.top-bar-left {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
}

.top-bar-right {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* === PAGES === */
.page {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s var(--transition);
}

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

/* === WELCOME PAGE === */
.welcome-circle-frame {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 420px;
  height: 420px;
}

.welcome-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(123, 209, 250, 0.25);
  box-shadow: 
    0 0 30px rgba(123, 209, 250, 0.1),
    inset 0 0 30px rgba(123, 209, 250, 0.05);
  animation: ring-pulse 4s ease-in-out infinite;
}

.welcome-ring::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(123, 209, 250, 0.2),
    transparent,
    rgba(196, 193, 251, 0.15),
    transparent
  );
  animation: ring-rotate 8s linear infinite;
}

.welcome-bubble {
  position: relative;
  background: rgba(12, 19, 36, 0.7);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(123, 209, 250, 0.2);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-bottom: 24px;
  max-width: 320px;
  text-align: center;
  box-shadow: 
    0 0 40px rgba(123, 209, 250, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.welcome-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
}

.enter-button {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 40px;
  background: linear-gradient(135deg, rgba(123, 209, 250, 0.2), rgba(196, 193, 251, 0.15));
  border: 1px solid rgba(123, 209, 250, 0.4);
  border-radius: 28px;
  cursor: pointer;
  transition: all 0.3s var(--transition);
  box-shadow: var(--glow-primary);
  overflow: hidden;
}

.enter-button::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 28px;
  background: radial-gradient(circle at center, rgba(123, 209, 250, 0.15), transparent 70%);
  animation: btn-breathe 3s ease-in-out infinite;
}

.enter-button:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px rgba(123, 209, 250, 0.5), 0 0 60px rgba(123, 209, 250, 0.2);
  border-color: rgba(123, 209, 250, 0.7);
}

.enter-text-cn {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.1em;
}

.enter-text-en {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

/* === MAIN PAGE (Character) === */
#main-page {
  flex-direction: column;
  gap: 0;
}

.character-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.character-title {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
  text-shadow: 0 0 20px rgba(123, 209, 250, 0.3);
}

#main-page.active .character-title {
  opacity: 1;
  transform: translateY(0);
}

.character-ring {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring-glow {
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 1.5px solid rgba(123, 209, 250, 0.3);
  box-shadow: 
    0 0 25px rgba(123, 209, 250, 0.15),
    inset 0 0 25px rgba(123, 209, 250, 0.05);
  animation: ring-pulse 4s ease-in-out infinite;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.ring-glow::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent,
    rgba(123, 209, 250, 0.15),
    transparent,
    rgba(253, 224, 71, 0.1),
    transparent
  );
  animation: ring-rotate 10s linear infinite;
}

.ring-glow::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(123, 209, 250, 0.08) 0%, transparent 70%);
}

.character-img {
  position: relative;
  height: 340px;
  width: auto;
  object-fit: contain;
  z-index: 2;
  margin-top: -60px;
  filter: drop-shadow(0 0 20px rgba(123, 209, 250, 0.2));
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.8s var(--transition), transform 0.8s var(--transition);
}

#main-page.active .character-img {
  opacity: 1;
  transform: scale(1);
}

/* === BUBBLES === */
.bubbles-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12%;
}

.bubble-left, .bubble-right {
  display: flex;
  flex-direction: column;
  gap: 28px;
  pointer-events: auto;
}

.bubble-btn {
  position: relative;
  padding: 12px 24px;
  background: rgba(12, 19, 36, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(123, 209, 250, 0.25);
  border-radius: 24px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 0 15px rgba(123, 209, 250, 0.08);
  opacity: 0;
  white-space: nowrap;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

.bubble-btn:hover {
  border-color: rgba(123, 209, 250, 0.5);
  box-shadow: 0 0 25px rgba(123, 209, 250, 0.2);
}

#main-page.active .bubble-btn {
  opacity: 1;
  animation: float 3.5s ease-in-out infinite;
  transition: opacity 0.6s var(--transition);
}

/* Stagger delays for bubble appearance */
.bubble-left .bubble-btn:nth-child(1) { transition-delay: 0.5s; animation-delay: 0s; }
.bubble-left .bubble-btn:nth-child(2) { transition-delay: 0.65s; animation-delay: 0.6s; }
.bubble-left .bubble-btn:nth-child(3) { transition-delay: 0.8s; animation-delay: 1.2s; }
.bubble-right .bubble-btn:nth-child(1) { transition-delay: 0.6s; animation-delay: 0.3s; }
.bubble-right .bubble-btn:nth-child(2) { transition-delay: 0.75s; animation-delay: 0.9s; }
.bubble-right .bubble-btn:nth-child(3) { transition-delay: 0.9s; animation-delay: 1.5s; }

/* === SIDE NAVIGATION === */
.side-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 50;
}

.side-bubble {
  padding: 10px 16px;
  background: rgba(12, 19, 36, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(123, 209, 250, 0.2);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.side-bubble:hover {
  border-color: rgba(123, 209, 250, 0.5);
  color: var(--text-primary);
}

.side-bubble.active {
  transform: scale(1.08);
  border-color: rgba(123, 209, 250, 0.6);
  box-shadow: 0 0 20px rgba(123, 209, 250, 0.2);
  color: #fff;
  background: rgba(123, 209, 250, 0.1);
}

.back-btn {
  margin-top: 8px;
  border-color: rgba(253, 224, 71, 0.3);
  color: rgba(253, 224, 71, 0.8);
}

.back-btn:hover {
  border-color: rgba(253, 224, 71, 0.6);
  color: var(--gold);
}

/* === CONTENT AREA === */
.content-area {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 24px 180px 24px 32px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(123, 209, 250, 0.2) transparent;
}

.content-area::-webkit-scrollbar {
  width: 4px;
}

.content-area::-webkit-scrollbar-track {
  background: transparent;
}

.content-area::-webkit-scrollbar-thumb {
  background: rgba(123, 209, 250, 0.2);
  border-radius: 2px;
}

#content-page {
  justify-content: flex-start;
  align-items: stretch;
  padding-top: 48px;
  flex-direction: row;
}

.content-section {
  display: none;
  animation: fadeIn 0.4s var(--transition) forwards;
}

.content-section.active {
  display: block;
}

/* === INTERNSHIP === */
.internship-block {
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
}

.internship-block.primary {
  flex: 2;
}

.internship-block.secondary {
  flex: 1;
}

.company-header {
  display: flex;
  gap: 20px;
}

.company-logo {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
}

.tencent-logo {
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.3), rgba(0, 102, 204, 0.1));
}

.netease-logo {
  background: linear-gradient(135deg, rgba(220, 50, 50, 0.3), rgba(220, 50, 50, 0.1));
}

.company-info {
  flex: 1;
}

.job-title-box {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(123, 209, 250, 0.08);
}

.job-title-box h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.job-period {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 13px;
  color: var(--primary);
  opacity: 0.8;
  white-space: nowrap;
}

.work-item {
  margin-bottom: 18px;
}

.work-item-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.work-item-header h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.work-icon {
  color: var(--primary);
  flex-shrink: 0;
}

.decor-icon {
  margin-left: auto;
  flex-shrink: 0;
  opacity: 0.6;
}

.work-detail {
  padding-left: 28px;
}

.detail-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.detail-bullet {
  width: 6px;
  height: 6px;
  min-width: 6px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.5;
  margin-top: 8px;
}

.detail-row p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
  flex: 1;
}

.detail-row p strong {
  color: var(--text-primary);
}

.detail-icons {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  margin-top: 4px;
}

/* === PROJECTS === */
.project-block {
  display: flex;
  gap: 24px;
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  min-height: 300px;
}

.project-carousel {
  position: relative;
  width: 360px;
  min-width: 360px;
  height: 240px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
}

.carousel-wrapper {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  height: 100%;
  transition: transform 0.4s var(--transition);
}

.carousel-track img {
  width: 360px;
  min-width: 360px;
  height: 100%;
  object-fit: cover;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(12, 19, 36, 0.8);
  border: 1px solid rgba(123, 209, 250, 0.3);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  z-index: 5;
}

.carousel-btn.prev { left: 8px; }
.carousel-btn.next { right: 8px; }

.carousel-btn:hover {
  background: rgba(123, 209, 250, 0.15);
  border-color: rgba(123, 209, 250, 0.6);
}

.carousel-dots {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
}

.carousel-dots .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transition: all 0.3s;
}

.carousel-dots .dot.active {
  background: var(--primary);
  box-shadow: 0 0 6px rgba(123, 209, 250, 0.5);
}

.project-info {
  flex: 1;
  overflow-y: auto;
  max-height: 280px;
  padding-right: 8px;
}

.project-info::-webkit-scrollbar {
  width: 3px;
}

.project-info::-webkit-scrollbar-thumb {
  background: rgba(123, 209, 250, 0.15);
  border-radius: 2px;
}

.project-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.meta-tag {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(123, 209, 250, 0.1);
  border: 1px solid rgba(123, 209, 250, 0.2);
  color: var(--text-secondary);
}

.meta-tag.highlight {
  background: rgba(253, 224, 71, 0.1);
  border-color: rgba(253, 224, 71, 0.3);
  color: var(--gold);
}

.project-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.project-desc {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.project-content-detail h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.project-step {
  display: flex;
  gap: 10px;
  margin-bottom: 8px;
}

.step-num {
  width: 20px;
  height: 20px;
  min-width: 20px;
  border-radius: 50%;
  background: rgba(123, 209, 250, 0.15);
  border: 1px solid rgba(123, 209, 250, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  margin-top: 2px;
}

.project-step > div {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.project-step strong {
  color: var(--text-primary);
}

.sub-list {
  list-style: none;
  padding-left: 12px;
  margin-top: 6px;
}

.sub-list li {
  position: relative;
  padding-left: 12px;
  margin-bottom: 6px;
  font-size: 12px;
  line-height: 1.6;
}

.sub-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--secondary);
  opacity: 0.5;
}

.project-links {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.project-link-btn {
  font-size: 11px;
  padding: 6px 14px;
  border-radius: 16px;
  background: rgba(123, 209, 250, 0.1);
  border: 1px solid rgba(123, 209, 250, 0.3);
  color: var(--primary);
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.project-link-btn:hover {
  background: rgba(123, 209, 250, 0.2);
  border-color: rgba(123, 209, 250, 0.5);
}

.project-link-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* === PROJECT BLOCK SCROLL === */
#section-projects {
  padding-bottom: 24px;
}

#section-projects .project-block:last-child {
  margin-bottom: 0;
}

/* === SKILLS === */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.skill-card {
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all 0.3s var(--transition);
}

.skill-card:hover {
  border-color: rgba(123, 209, 250, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.skill-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(123, 209, 250, 0.08);
  border: 1px solid rgba(123, 209, 250, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: var(--primary);
}

.skill-card h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.skill-card p {
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* === CAMPUS === */
.campus-block {
  margin-bottom: 24px;
}

.block-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(123, 209, 250, 0.1);
}

.block-title svg {
  color: var(--primary);
}

.campus-sub {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.campus-card {
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.campus-card h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.campus-card h4 .period {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  font-weight: 400;
  color: var(--primary);
  opacity: 0.8;
}

.campus-card > p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.campus-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.campus-item p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.campus-item .insight {
  color: var(--primary);
  opacity: 0.8;
  font-size: 12px;
  margin-top: 4px;
  padding-left: 16px;
}

/* === EVALUATION === */
.evaluation-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.eval-item {
  display: flex;
  gap: 16px;
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  align-items: flex-start;
  transition: all 0.3s var(--transition);
}

.eval-item:hover {
  border-color: rgba(123, 209, 250, 0.3);
  transform: translateX(4px);
}

.eval-icon {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 12px;
  background: rgba(123, 209, 250, 0.08);
  border: 1px solid rgba(123, 209, 250, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.eval-content {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.eval-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  opacity: 0.4;
  min-width: 28px;
}

.eval-content p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* === PERSONALITY === */
.personality-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.personality-card {
  background: rgba(12, 19, 36, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all 0.3s var(--transition);
}

.personality-card:hover {
  border-color: rgba(123, 209, 250, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.personality-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(123, 209, 250, 0.08);
  border: 1px solid rgba(123, 209, 250, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  color: var(--primary);
}

.personality-card h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.personality-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* === FLOATING ANIMATION FOR BUBBLES === */
.side-bubble {
  animation: float 3s ease-in-out infinite;
}

.side-bubble:nth-child(1) { animation-delay: 0s; }
.side-bubble:nth-child(2) { animation-delay: 0.4s; }
.side-bubble:nth-child(3) { animation-delay: 0.8s; }
.side-bubble:nth-child(4) { animation-delay: 0.2s; }
.side-bubble:nth-child(5) { animation-delay: 0.6s; }
.side-bubble:nth-child(6) { animation-delay: 1.0s; }