/* =========================================================
   xyb-site · 徐云斌的个人网站 · 现代简洁风
   ========================================================= */

:root {
  --xyb-bg: #f6f8fc;
  --xyb-bg-2: #ffffff;
  --xyb-ink: #1a2333;
  --xyb-ink-soft: #5a6b85;
  --xyb-primary: #4f6ef7;
  --xyb-primary-2: #7c5cfc;
  --xyb-gradient: linear-gradient(135deg, #4f6ef7 0%, #7c5cfc 50%, #b06cf8 100%);
  --xyb-shadow: 0 10px 30px rgba(31, 45, 90, .10);
  --xyb-shadow-lg: 0 24px 60px rgba(31, 45, 90, .16);
  --xyb-radius: 18px;
  --xyb-line: rgba(31, 45, 90, .08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--xyb-bg);
  color: var(--xyb-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ============ 背景装饰（动态渐变） ============ */
.xyb-bg-decor {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(-45deg, #eef2ff, #f5f0ff, #e8f4ff, #fdf2f8);
  background-size: 400% 400%;
  animation: xyb-bg-shift 18s ease infinite;
}
@keyframes xyb-bg-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ============ 导航栏（玻璃拟态）============ */
.xyb-nav {
  background: rgba(255, 255, 255, .72);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--xyb-line);
  transition: box-shadow .3s ease;
}
.xyb-nav.scrolled {
  box-shadow: 0 6px 24px rgba(31, 45, 90, .08);
}
.xyb-nav .navbar-brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: .5px;
  background: var(--xyb-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.xyb-nav .nav-link {
  color: var(--xyb-ink-soft);
  font-weight: 600;
  margin: 0 .25rem;
  padding: .5rem .8rem;
  border-radius: 10px;
  transition: all .25s ease;
  position: relative;
}
.xyb-nav .nav-link:hover {
  color: var(--xyb-primary);
  background: rgba(79, 110, 247, .08);
}
.xyb-nav .nav-link.active {
  color: var(--xyb-primary);
  background: rgba(79, 110, 247, .10);
}

/* ============ Hero 区 ============ */
.xyb-hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
  position: relative;
  overflow: hidden;
}
.xyb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(700px 500px at 20% 20%, rgba(79, 110, 247, .12), transparent 60%),
    radial-gradient(600px 420px at 80% 70%, rgba(124, 92, 252, .12), transparent 60%);
  z-index: -1;
}
.xyb-hero .xyb-badge {
  display: inline-block;
  padding: .35rem 1.1rem;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .5px;
  color: var(--xyb-primary);
  background: rgba(79, 110, 247, .10);
  border: 1px solid rgba(79, 110, 247, .20);
  margin-bottom: 1.4rem;
}
.xyb-hero h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  letter-spacing: 2px;
  line-height: 1.15;
  margin: 0 0 .6rem;
  background: var(--xyb-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: xyb-fade-up .9s ease both;
}
.xyb-hero .xyb-subtitle {
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  color: var(--xyb-ink-soft);
  max-width: 42rem;
  margin: .6rem auto 0;
  animation: xyb-fade-up .9s ease .15s both;
}
.xyb-hero .xyb-scroll-hint {
  margin-top: 3rem;
  color: var(--xyb-ink-soft);
  font-size: .9rem;
  animation: xyb-float 2.4s ease-in-out infinite;
}
.xyb-hero .xyb-scroll-hint .arrow {
  display: block;
  font-size: 1.4rem;
  margin-top: .2rem;
}

/* ============ 通用区块 ============ */
.xyb-section { padding: 4.5rem 0; }
.xyb-section-alt { background: var(--xyb-bg-2); }
.xyb-page-head {
  padding: 7rem 0 2.5rem;
  text-align: center;
  position: relative;
}
.xyb-page-head h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  background: var(--xyb-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.xyb-page-head .lead {
  color: var(--xyb-ink-soft);
  max-width: 36rem;
  margin: .6rem auto 0;
  font-size: 1.08rem;
}
.xyb-section-title {
  text-align: center;
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}
.xyb-section-sub {
  text-align: center;
  color: var(--xyb-ink-soft);
  max-width: 34rem;
  margin: 0 auto 3rem;
}

/* ============ 卡片 ============ */
.xyb-card {
  display: block;
  background: rgba(255, 255, 255, .85);
  border: 1px solid var(--xyb-line);
  border-radius: var(--xyb-radius);
  padding: 1.8rem 1.6rem;
  text-decoration: none;
  color: var(--xyb-ink);
  height: 100%;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  position: relative;
  overflow: hidden;
}
.xyb-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--xyb-gradient);
  opacity: 0;
  transition: opacity .3s ease;
}
.xyb-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--xyb-shadow-lg);
  border-color: rgba(79, 110, 247, .25);
  color: var(--xyb-ink);
}
.xyb-card:hover::after { opacity: 1; }
.xyb-card .xyb-topic-icon {
  font-size: 2.2rem;
  margin-bottom: .8rem;
  display: inline-block;
  transition: transform .3s ease;
}
.xyb-card:hover .xyb-topic-icon { transform: scale(1.15) rotate(-6deg); }
.xyb-card h4 {
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 0 .4rem;
}
.xyb-card p {
  color: var(--xyb-ink-soft);
  font-size: .94rem;
  margin: 0;
}

/* ============ 照片墙 ============ */
.xyb-photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
}
.xyb-photo-item {
  position: relative;
  border-radius: var(--xyb-radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: var(--xyb-shadow);
  cursor: pointer;
}
.xyb-photo-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.xyb-photo-item:hover img { transform: scale(1.06); }
.xyb-photo-item .xyb-photo-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 1.2rem 1rem .9rem;
  background: linear-gradient(transparent, rgba(15, 22, 40, .75));
  color: #fff;
  font-size: .88rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(10px);
  transition: all .35s ease;
}
.xyb-photo-item:hover .xyb-photo-caption {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 旋转木马结束 ============ */

/* ============ 时间线 ============ */
.xyb-timeline {
  position: relative;
  padding-left: 2.4rem;
}
.xyb-timeline::before {
  content: "";
  position: absolute;
  left: 11px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--xyb-primary), var(--xyb-primary-2), transparent);
  border-radius: 2px;
}
.xyb-tl-item {
  position: relative;
  margin-bottom: 2.8rem;
  background: rgba(255, 255, 255, .8);
  border: 1px solid var(--xyb-line);
  border-radius: var(--xyb-radius);
  padding: 1.4rem 1.5rem;
  transition: transform .3s ease, box-shadow .3s ease;
}
.xyb-tl-item:hover {
  transform: translateX(6px);
  box-shadow: var(--xyb-shadow);
}
.xyb-tl-item::before {
  content: "";
  position: absolute;
  left: -2.4rem; top: 1.4rem;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--xyb-gradient);
  border: 3px solid var(--xyb-bg);
  box-shadow: 0 0 0 2px rgba(79, 110, 247, .35);
}
.xyb-tl-date {
  color: var(--xyb-primary);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .5px;
}
.xyb-tl-title {
  font-weight: 700;
  font-size: 1.18rem;
  margin: .2rem 0 .5rem;
}
.xyb-tl-item img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin-top: .8rem;
  border: 1px solid var(--xyb-line);
}
.xyb-tl-caption {
  color: var(--xyb-ink-soft);
  font-size: .85rem;
  margin-top: .4rem;
}

/* ============ 页脚 ============ */
.xyb-footer {
  border-top: 1px solid var(--xyb-line);
  color: var(--xyb-ink-soft);
  font-size: .92rem;
  padding: 3rem 0;
  margin-top: 3rem;
  background: rgba(255, 255, 255, .5);
}
.xyb-footer a { color: var(--xyb-primary); text-decoration: none; }

/* ============ 关于我 ============ */
.xyb-about-text p { color: var(--xyb-ink); }
.xyb-about-text h4 { font-weight: 700; }

/* ============ 动画 ============ */
@keyframes xyb-fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes xyb-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

/* 滚动渐入 */
.xyb-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.xyb-reveal.xyb-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 标题悬停跳动动画 ============ */
.xyb-jump {
  display: inline-block;
  transition: transform .25s cubic-bezier(.34, 1.56, .64, 1);
  cursor: default;
}
.xyb-jump:hover {
  transform: translateY(-8px) scale(1.06) rotate(-1.5deg);
  animation: xyb-bounce .6s ease;
}
@keyframes xyb-bounce {
  0%   { transform: translateY(-8px) scale(1.06) rotate(-1.5deg); }
  30%  { transform: translateY(-14px) scale(1.1) rotate(1deg); }
  60%  { transform: translateY(-6px) scale(1.04) rotate(-1deg); }
  100% { transform: translateY(-8px) scale(1.06) rotate(-1.5deg); }
}
/* 弹跳后恢复 */
.xyb-jump:hover { animation: xyb-bounce .6s ease; }

/* ============ 旋转木马（Carousel） ============ */
.xyb-carousel {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--xyb-radius);
  overflow: hidden;
  box-shadow: var(--xyb-shadow-lg);
}
.xyb-carousel-track {
  display: flex;
  transition: transform .55s cubic-bezier(.4, 0, .2, 1);
}
.xyb-carousel-slide {
  min-width: 100%;
  position: relative;
}
.xyb-carousel-slide img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  display: block;
}
.xyb-carousel-slide .xyb-carousel-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 2.2rem 1.5rem 1.2rem;
  background: linear-gradient(transparent, rgba(15, 22, 40, .78));
  color: #fff;
  font-weight: 600;
  text-align: center;
  font-size: .95rem;
}
/* 前后按钮 */
.xyb-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, .85);
  color: var(--xyb-ink);
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(31, 45, 90, .18);
  transition: all .25s ease;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
}
.xyb-carousel-btn:hover {
  background: #fff;
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 6px 20px rgba(31, 45, 90, .25);
}
.xyb-carousel-prev { left: 14px; }
.xyb-carousel-next { right: 14px; }
/* 指示圆点 */
.xyb-carousel-dots {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
}
.xyb-carousel-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, .5);
  cursor: pointer;
  transition: all .3s ease;
  padding: 0;
}
.xyb-carousel-dot.active {
  background: #fff;
  transform: scale(1.3);
}
@media (max-width: 768px) {
  .xyb-carousel-slide img { height: 300px; }
}

/* 延迟工具 */
.d-1 { transition-delay: .08s; }
.d-2 { transition-delay: .16s; }
.d-3 { transition-delay: .24s; }
.d-4 { transition-delay: .32s; }

/* ============ 响应式 ============ */
@media (max-width: 768px) {
  .xyb-section { padding: 3rem 0; }
  .xyb-timeline { padding-left: 1.8rem; }
  .xyb-tl-item::before { left: -1.8rem; }
}

/* 打印友好 */
@media print {
  .xyb-nav, .xyb-footer, .xyb-bg-decor { display: none !important; }
}