/* ==========================================================================
   青衿纪念册 · 首页 v2
   在 base.css v2 token 之上重做首屏与内容区：
     1. 首屏左右分栏 + 右侧 3D 照片塔（鼠标/滚动视差）
     2. 章节标题带序号与渐变细线
     3. 卡片升级：悬停抬升、图片缓推、玻璃高光扫过
     4. 移动端整段降级为单列，照片塔变成顶部横条
   ========================================================================== */

/* ---------------------------------------------------------- 首屏 */
.hero--v2 {
  position: relative;
  min-height: min(94svh, 980px);
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(96px, 13vh, 168px) var(--gutter) clamp(56px, 9vh, 110px);
}

.hero__text { min-width: 0; }

.hero--v2 .hero__badge {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .42em 1.05em;
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: var(--tracking-wide);
  color: color-mix(in srgb, var(--c-accent) 70%, white);
  background: color-mix(in srgb, var(--c-accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--c-accent) 32%, transparent);
  backdrop-filter: blur(10px);
}

.hero--v2 .hero__title {
  margin: clamp(16px, 2.4vw, 26px) 0 clamp(10px, 1.4vw, 16px);
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: var(--tracking-tight);
  color: #fff;
  text-wrap: balance;
  text-shadow: 0 18px 60px rgba(0, 0, 0, .55);
}
.hero--v2 .hero__char { display: inline-block; }
.hero__clause {
  display: inline-block;
  white-space: nowrap;
  margin-right: .1em;
}

.hero--v2 .hero__sub {
  font-size: clamp(.95rem, 1.5vw, 1.12rem);
  color: var(--t-2);
  letter-spacing: .02em;
}
.hero--v2 .hero__motto {
  margin-top: .55em;
  font-size: clamp(.86rem, 1.2vw, .98rem);
  color: var(--t-3);
}

.hero--v2 .hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3vw, 34px) 0 clamp(22px, 3vw, 32px);
}
.hero--v2 .stat {
  position: relative;
  min-width: 108px;
  padding: 12px 18px 11px;
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(255, 255, 255, .13), rgba(255, 255, 255, .04));
  border: 1px solid var(--stroke-1);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .14);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) ease;
}
.hero--v2 .stat:hover { transform: translateY(-3px); border-color: var(--stroke-2); }
.hero--v2 .stat__num {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.hero--v2 .stat__suffix { font-size: .8rem; color: var(--t-3); margin-left: 2px; }
.hero--v2 .stat i {
  display: block;
  margin-top: 2px;
  font-style: normal;
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--t-3);
}

.hero--v2 .hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

.hero--v2 .hero__hello {
  margin-top: clamp(16px, 2.4vw, 24px);
  font-size: .82rem;
  color: var(--t-3);
}

/* 3D 照片塔 */
.hero__stack {
  position: relative;
  height: min(62vh, 560px);
  perspective: 1400px;
  perspective-origin: 60% 40%;
  pointer-events: none;
}
.hero__stack-glow {
  position: absolute;
  inset: 8% 4%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%,
    color-mix(in srgb, var(--c-primary) 42%, transparent), transparent 66%);
  filter: blur(56px);
  opacity: .8;
  animation: stackGlow 12s var(--ease-io) infinite alternate;
}
@keyframes stackGlow {
  from { transform: scale(.92); opacity: .55; }
  to { transform: scale(1.08); opacity: .9; }
}

.shot {
  --k: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(190px, 21vw, 268px);
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  transform-style: preserve-3d;
  transform:
    translate(-50%, -50%)
    translate3d(calc((var(--k) - 1) * 74%), calc((var(--k) - 1) * 15%), calc(var(--k) * -90px))
    rotateY(calc(-16deg + var(--k) * 8deg))
    rotateX(5deg)
    rotateZ(calc((var(--k) - 1) * 7deg));
  box-shadow: 0 46px 90px -40px rgba(0, 0, 0, .9), inset 0 1px 0 rgba(255, 255, 255, .2);
  border: 1px solid rgba(255, 255, 255, .22);
  background: rgba(255, 255, 255, .05);
  transition: transform .9s var(--ease), box-shadow .9s var(--ease);
  animation: shotIn 1.1s var(--ease) both;
  animation-delay: calc(.15s + var(--k) * .12s);
}
/* 中间的卡在最上层，左右两张微调透明度形成纵深 */
.shot[style*="--k:1"] { z-index: 3; }
.shot[style*="--k:0"] { z-index: 2; opacity: .92; }
.shot[style*="--k:2"] { z-index: 1; opacity: .88; }
@keyframes shotIn {
  from { opacity: 0; transform: translate(-50%, -42%) rotateY(-26deg) scale(.9); }
}
.shot img {
  width: 100%;
  height: clamp(210px, 24vw, 310px);
  object-fit: cover;
  filter: saturate(1.06) contrast(1.03);
}
.shot figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 26px 16px 12px;
  font-size: .74rem;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .9);
  background: linear-gradient(transparent, rgba(3, 16, 20, .82));
}

.hero__scrollcue {
  position: absolute;
  left: 50%;
  bottom: clamp(16px, 3vh, 34px);
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: .5em;
  font-size: .72rem;
  letter-spacing: var(--tracking-wide);
  color: var(--t-4);
}
.hero__scrollcue i {
  display: block;
  width: 1px;
  height: 30px;
  background: linear-gradient(var(--t-4), transparent);
  animation: cueDrop 2.2s var(--ease-io) infinite;
}
@keyframes cueDrop {
  0%, 100% { opacity: .25; transform: scaleY(.6); transform-origin: top; }
  50% { opacity: .9; transform: scaleY(1); }
}

/* ---------------------------------------------------------- 章节 */
.section {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(56px, 8vw, 104px) var(--gutter);
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: clamp(22px, 3.4vw, 38px);
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

.section__title {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 800;
  letter-spacing: var(--tracking-tight);
  line-height: 1.24;
  color: #fff;
  text-wrap: balance;
}
.section__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 54px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  box-shadow: 0 0 18px color-mix(in srgb, var(--c-primary) 60%, transparent);
}

.section__desc {
  margin-top: 16px;
  font-size: clamp(.86rem, 1.2vw, .98rem);
  color: var(--t-3);
  max-width: 56ch;
}

.section__meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.section__count {
  font-size: .76rem;
  letter-spacing: .04em;
  padding: .34em .8em;
  border-radius: 999px;
  color: var(--t-2);
  background: var(--glass-1);
  border: 1px solid var(--stroke-1);
}
.section__link {
  font-size: .84rem;
  color: color-mix(in srgb, var(--c-primary) 76%, white);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, gap .3s ease;
}
.section__link:hover { border-color: currentColor; }

/* ---------------------------------------------------------- 卡片 */
.grid { display: grid; gap: clamp(12px, 1.6vw, 20px); }

.card {
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  box-shadow: 0 20px 50px -34px rgba(0, 0, 0, .9);
  transition: transform .55s var(--ease), border-color .4s ease, box-shadow .55s var(--ease);
  cursor: zoom-in;
  will-change: transform;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, .26);
  box-shadow: 0 34px 70px -34px rgba(0, 0, 0, .95),
              0 0 0 1px color-mix(in srgb, var(--c-primary) 26%, transparent);
}
.card__img { transition: transform 1.2s var(--ease), filter .5s ease; }
.card:hover .card__img { transform: scale(1.06); filter: saturate(1.1) brightness(1.04); }

/* 高光扫过 */
.card__sheen {
  position: absolute;
  inset: -40% -120%;
  background: linear-gradient(105deg, transparent 38%, rgba(255, 255, 255, .22) 50%, transparent 62%);
  transform: translateX(-60%);
  opacity: 0;
  transition: transform 1.1s var(--ease), opacity .4s ease;
  pointer-events: none;
}
.card:hover .card__sheen { transform: translateX(60%); opacity: 1; }

.card__cap {
  padding: 11px 14px 13px;
  background: linear-gradient(180deg, rgba(4, 18, 22, .55), rgba(4, 18, 22, .82));
  border-top: 1px solid rgba(255, 255, 255, .08);
}
.card__cap b { display: block; font-size: .88rem; font-weight: 700; color: #fff; letter-spacing: .01em; }
.card__cap span { display: block; margin-top: 2px; font-size: .74rem; color: var(--t-3); }

/* 视频卡片播放按钮 */
.card__play span {
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-primary) 50%, transparent);
  animation: playPulse 2.6s var(--ease-io) infinite;
}
@keyframes playPulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--c-primary) 45%, transparent); }
  70% { box-shadow: 0 0 0 18px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* 动图角标 */
.card__motion {
  position: absolute;
  left: 10px;
  top: 10px;
  display: inline-flex;
  align-items: center;
  gap: .35em;
  padding: .3em .7em;
  border-radius: 999px;
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: .06em;
  color: #04211f;
  background: linear-gradient(120deg, #ffcf7a, #7dffd8);
  box-shadow: 0 6px 18px -6px rgba(0, 0, 0, .6);
}
.card__motion::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #04211f;
  animation: livePulse 1.6s var(--ease-io) infinite;
}
@keyframes livePulse {
  0%, 100% { opacity: .35; transform: scale(.8); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* ---------------------------------------------------------- 时间轴预览 / 留言预览 */
.minitl { display: grid; gap: 10px; }
.minitl__item {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 15px 18px;
  border-radius: var(--r-sm);
  background: var(--glass-1);
  border: 1px solid rgba(255, 255, 255, .09);
  transition: background .35s ease, border-color .35s ease, transform .35s var(--ease);
}
.minitl__item:hover { background: var(--glass-2); border-color: var(--stroke-1); transform: translateX(4px); }
.minitl__item time {
  font-size: .74rem;
  letter-spacing: .08em;
  color: color-mix(in srgb, var(--c-primary) 70%, white);
  font-variant-numeric: tabular-nums;
}
.minitl__item b { font-size: .95rem; }
.minitl__item p { font-size: .8rem; color: var(--t-3); grid-column: 3; }

/* ---------------------------------------------------------- 导航：氛围按钮 */
.nav__mood {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--stroke-1);
  background: var(--glass-1);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), border-color .3s ease, background .3s ease;
}
.nav__mood:hover { transform: rotate(30deg) scale(1.06); border-color: var(--stroke-2); background: var(--glass-2); }
.nav__mood-dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: conic-gradient(from 210deg, var(--c-primary), var(--c-accent), var(--c-violet), var(--c-primary));
  box-shadow: 0 0 12px color-mix(in srgb, var(--c-primary) 60%, transparent);
}

/* ---------------------------------------------------------- 响应式 */
@media (max-width: 980px) {
  .hero--v2 {
    grid-template-columns: minmax(0, 1fr);
    min-height: auto;
    padding-top: clamp(84px, 14vh, 130px);
    text-align: left;
  }
  .hero__stack {
    order: -1;
    height: clamp(190px, 42vw, 300px);
    margin-bottom: 6px;
  }
  .shot { width: clamp(150px, 40vw, 220px); }
  .shot img { height: clamp(170px, 44vw, 250px); }
  .hero__scrollcue { display: none; }
  .section__title::after { bottom: -8px; }
}

@media (max-width: 560px) {
  .hero--v2 { padding-left: 18px; padding-right: 18px; }
  .hero--v2 .hero__stats { gap: 8px; }
  .hero--v2 .stat { flex: 1 1 calc(33.33% - 8px); min-width: 0; padding: 10px 12px; }
  .hero--v2 .stat__num { font-size: 1.25rem; }
  .hero--v2 .stat i { font-size: .68rem; }
  .hero--v2 .hero__actions .btn { flex: 1 1 100%; }
  .minitl__item { grid-template-columns: auto minmax(0, 1fr); }
  .minitl__item p { grid-column: 2; }
  .section__head { gap: 12px; }
}