/* ==========================================================================
   核云 — 云端算力 · 核芯驱动
   单屏 Hero 落地页样式（仿 Terranova 液态玻璃架构，纯原生 CSS）
   ========================================================================== */

/* ---------- Reset ---------- */
html, body {
  width: 100%; height: 100%;
  overflow: hidden; overflow-x: hidden;
  background: #c2ccd3;          /* 视频加载前的底色，仅此而已 */
  color: #000;
  font-family: 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial,
               'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Background video ---------- */
.bg-video {
  position: fixed; top: 0; left: 0;
  display: block;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 1;                   /* 100% 不透明度，任何断点都无遮罩/压暗层 */
  pointer-events: none;
}

/* ---------- SVG filter defs (offscreen) ---------- */
.glass-defs { position: absolute; width: 0; height: 0; pointer-events: none; }

/* ---------- Hero shell ---------- */
.hero {
  position: relative; z-index: 10;
  display: flex; flex-direction: column;
  width: 100%; height: 100vh; height: 100dvh;
  color: #000;
  pointer-events: none;         /* 仅交互子元素单独开启 pointer-events: auto */
}
.icon { flex: none; }

/* ---------- Vertical rules (≥768px) ---------- */
.rule { position: absolute; top: 0; bottom: 0; display: none; flex-direction: column; align-items: center; }
.rule--left  { left: 1.25rem; }
.rule--right { right: 1.25rem; }
.rule__seg { width: 1px; background: rgba(0, 0, 0, 0.2); }
.rule__seg--end { height: 15%; }
.rule__seg--mid { flex: 1 1 0%; }
.rule__plus { font-size: 0.75rem; line-height: 1; color: rgba(0, 0, 0, 0.4); padding: 0.25rem 0; }
@media (min-width: 768px) { .rule { display: flex; } }

/* ---------- Navbar ---------- */
.nav { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; padding: 1.25rem; }
.nav__item {
  display: inline-flex; align-items: center; gap: 0.625rem;
  color: #000; background: none; border: 0; font: inherit; text-decoration: none;
  cursor: pointer; pointer-events: auto; transition: opacity 300ms;
}
.nav__item:hover { opacity: 0.6; }
.nav__label { font-size: 0.875rem; line-height: 1.25rem; letter-spacing: 0.025em; }
.nav__label--menu { display: none; }          /* 移动端仅汉堡图标 */
.nav__dot { width: 8px; height: 8px; border-radius: 9999px; background: #000; }

@media (min-width: 640px) { .nav { padding: 1.25rem 1.5rem; } .nav__label--menu { display: inline; } }
@media (min-width: 768px) { .nav { padding: 1.5rem 3rem; } }

/* ---------- Bottom row ---------- */
.hero-bottom {
  position: relative; z-index: 2;
  margin-top: auto;
  display: flex; flex-direction: column; gap: 1.5rem;
  padding: 0 1.25rem 1.5rem;    /* 与 .nav 对齐，保证左右列与导航同宽 */
}
@media (min-width: 640px) { .hero-bottom { padding: 0 1.5rem 2rem; } }
@media (min-width: 768px) {
  .hero-bottom {
    flex: 1; margin-top: 0;
    flex-direction: row; align-items: stretch; justify-content: space-between;
    gap: 3rem; padding: 2rem 3rem 3rem;
  }
  .lede { align-self: flex-start; }   /* 文案钉在左上 */
  .card { align-self: flex-end; }     /* 卡片钉在右下，对角线构图 */
}

/* ---------- Left column — copy ---------- */
.lede { max-width: 24rem; }
.lede__title { font-size: 1.25rem; font-weight: 300; line-height: 1.25; letter-spacing: -0.025em; color: #000; }
.lede__body  { margin-top: 0.75rem; max-width: 280px; font-size: 0.75rem; line-height: 1.625; color: rgba(0, 0, 0, 0.6); }

@media (min-width: 640px)  { .lede__title { font-size: 1.5rem; }   .lede__body { font-size: 0.875rem; } }
@media (min-width: 768px)  { .lede__title { font-size: 1.875rem; } .lede__body { margin-top: 1rem; } }
@media (min-width: 1024px) { .lede__title { font-size: 2.25rem; } }

/* ---------- Chamfered CTA ---------- */
.chamfer {
  position: relative; display: flex; align-items: center; justify-content: space-between;
  width: 220px; height: 44px; margin-top: 1.5rem; padding: 0 1.25rem;
  color: #000; text-decoration: none; pointer-events: auto; transition: opacity 300ms;
}
.chamfer:hover { opacity: 0.7; }

/* 仅移动端：与切角轮廓同形的毛玻璃底 */
.chamfer__glass {
  position: absolute; inset: 0;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(0, 0, 0, 0.2);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}
.chamfer__outline { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.chamfer__label { position: relative; font-size: 0.75rem; letter-spacing: 0.025em; }
.chamfer .icon { position: relative; }

@media (min-width: 640px) {
  .chamfer { width: 260px; height: 48px; padding: 0 1.5rem; }
  .chamfer__label { font-size: 0.875rem; }
  .chamfer__glass { background: transparent; backdrop-filter: none; -webkit-backdrop-filter: none; border-color: transparent; }
}
@media (min-width: 768px) { .chamfer { margin-top: 2rem; } }

/* ---------- Right column — liquid-glass card ---------- */
.card {
  position: relative;
  display: flex; flex-direction: column; justify-content: space-between;
  width: 340px; max-width: 100%; height: 460px;
  padding: 2rem;
  border-radius: 48px;
  overflow: hidden;             /* 把副本裁剪进卡片圆角内 */
  background: transparent;      /* 折射本身就是填充 */
  border: 1px solid rgba(47, 47, 47, 0.15);
  pointer-events: auto;
  animation: fade-slide-up-card 900ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
@keyframes fade-slide-up-card {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 与视口 1:1 对齐的背景副本；left/top/width/height 由 glass-card.js 每帧写入 */
#dup-video-container { position: absolute; left: 0; top: 0; z-index: 0; overflow: hidden; pointer-events: none; }
#dup-image { position: absolute; inset: 0; width: 100%; height: 100%; filter: url(#liquid-glass-refraction); }

.card__frost {
  position: absolute; inset: 0; z-index: 1;
  border-radius: 48px; pointer-events: none;
  background: rgba(255, 255, 255, 0.05);
  box-shadow: inset 0 1.5px 2px rgba(255, 255, 255, 0.3),
              inset 0 -1px 2px rgba(0, 0, 0, 0.15);
  transition: background 400ms;
}
.card.group:hover .card__frost { background: rgba(255, 255, 255, 0.1); }

.card__head, .card__body, .card__wave { position: relative; z-index: 2; }

.card__head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
              padding-bottom: 0.75rem; border-bottom: 1px solid rgba(0, 0, 0, 0.1); }
.card__title { font-size: 1rem; font-weight: 500; letter-spacing: -0.025em; }
.card__index { font-size: 0.75rem; color: rgba(0, 0, 0, 0.4); }
.card__body { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.finding__title { font-size: 0.875rem; font-weight: 600; letter-spacing: -0.025em; }
.finding__text { margin-top: 0.25rem; font-size: 0.75rem; line-height: 1.625; color: rgba(0, 0, 0, 0.5); }
.card__wave { display: block; width: 100%; height: auto; margin-top: 1.25rem; }

@media (min-width: 640px) { .card__title { font-size: 1.125rem; } }
@media (min-width: 768px) {
  .card__head { padding-bottom: 1rem; }
  .card__title { font-size: 1.25rem; }
  .card__body { gap: 1.25rem; margin-top: 1.25rem; }
  .finding__title { font-size: 1rem; }
  .finding__text { font-size: 0.875rem; margin-top: 0.375rem; }
  .card__wave { margin-top: 1.5rem; }
}

/* ---------- Slide-in fullscreen menu ---------- */
.menu { position: fixed; inset: 0; z-index: 50; visibility: hidden; pointer-events: none;
        transition: visibility 0s linear 500ms; }
.menu.is-open { visibility: visible; pointer-events: auto; transition-delay: 0s; }

.menu__backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.4);
                  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
                  opacity: 0; transition: opacity 500ms; }
.menu.is-open .menu__backdrop { opacity: 1; }

.menu__panel { position: absolute; top: 0; left: 0; display: flex; flex-direction: column;
               width: 100%; height: 100%; padding: 1.5rem 2rem; background: #f5f4f0;
               transform: translateX(-100%);
               transition: transform 500ms cubic-bezier(0.16, 1, 0.3, 1); }
.menu.is-open .menu__panel { transform: translateX(0); }
@media (min-width: 640px) { .menu__panel { width: 380px; padding: 1.5rem 2.5rem; } }

.menu__close { display: inline-flex; align-items: center; gap: 0.625rem; align-self: flex-start;
               margin-bottom: 3rem; background: none; border: 0; font: inherit; font-size: 0.875rem;
               color: #000; cursor: pointer; transition: opacity 300ms; }
.menu__close:hover { opacity: 0.6; }

.menu__nav { display: flex; flex-direction: column; }
.menu__link { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0;
              border-bottom: 1px solid rgba(0, 0, 0, 0.1); color: #000; text-decoration: none;
              opacity: 0; transform: translateY(20px); transition: opacity 500ms, transform 500ms; }
.menu__linkText { font-size: 1.5rem; font-weight: 300; letter-spacing: -0.025em; transition: transform 300ms; }
.menu__link:hover .menu__linkText { transform: translateX(8px); }
.menu__arrow { opacity: 0; transform: translateX(8px); transition: opacity 300ms, transform 300ms; }
.menu__link:hover .menu__arrow { opacity: 1; transform: translateX(0); }
@media (min-width: 640px) { .menu__linkText { font-size: 1.875rem; } }

.menu.is-open .menu__link { opacity: 1; transform: translateY(0); }
.menu.is-open .menu__link:nth-child(1) { transition-delay: 150ms; }
.menu.is-open .menu__link:nth-child(2) { transition-delay: 225ms; }
.menu.is-open .menu__link:nth-child(3) { transition-delay: 300ms; }
.menu.is-open .menu__link:nth-child(4) { transition-delay: 375ms; }
.menu.is-open .menu__link:nth-child(5) { transition-delay: 450ms; }

.menu__foot { margin-top: auto; padding: 1.5rem 0 2rem; border-top: 1px solid rgba(0, 0, 0, 0.1);
              opacity: 0; transform: translateY(20px); transition: opacity 500ms, transform 500ms; }
.menu.is-open .menu__foot { opacity: 1; transform: translateY(0); transition-delay: 600ms; }
.menu__footLabel { display: block; margin-bottom: 0.75rem; font-size: 0.75rem; text-transform: uppercase;
                   letter-spacing: 0.025em; color: rgba(0, 0, 0, 0.4); }
.menu__mail { font-size: 0.875rem; color: rgba(0, 0, 0, 0.7); text-decoration: none; transition: color 300ms; }
.menu__mail:hover { color: #000; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) { * { transition-duration: 0.01ms !important; } }