/* ==========================================================================
   components.css — 导航、移动端菜单、玻璃卡、徽章、时间线、vs 卡、footer 等
   性能纪律：backdrop-filter 仅用于固定导航与移动端菜单（共 2 处）
   ========================================================================== */

/* ---- 顶部滚动进度条 ---- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--grad-brand);
  box-shadow: 0 0 10px color-mix(in srgb, var(--c-cyan) 50%, transparent);
  z-index: calc(var(--z-nav) + 1);
}

/* ---- 固定导航 ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: var(--z-nav);
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s, border-color 0.3s;
}

.nav.scrolled {
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--glass-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--nav-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

/* Logo 图：白底宽幅 JPG，加白色圆角底板避免白底矩形在深色导航上显得突兀 */
.brand-logo {
  display: block;
  height: 32px;
  width: auto;
  padding: 4px 10px;
  background: #fff;
  border-radius: 8px;
}

footer .brand-logo {
  height: 36px;
}

.brand-name {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  position: relative;
  font-size: 0.95rem;
  color: var(--text-sub);
  padding: 6px 0;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-main);
}

/* 下划线从右向左展开 */
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-brand);
  transition: right 0.3s var(--ease-out);
}

.nav-links a:hover::after {
  right: 0;
}

.btn-sm {
  min-height: 38px;
  padding: 0 22px;
  font-size: 0.9rem;
}

/* ---- 汉堡按钮（移动端） ---- */
.burger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
}

.burger span {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--text-main);
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
}

.burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- 移动端全屏菜单 ---- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: color-mix(in srgb, var(--bg-deep) 90%, transparent);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu a:not(.btn) {
  font-size: 1.4rem;
  padding: 12px 28px;
  color: var(--text-main);
  transition: color 0.2s;
}

.mobile-menu a:not(.btn):hover {
  color: var(--c-cyan);
}

.mobile-menu .btn {
  margin-top: 20px;
}

/* ---- 玻璃卡片（无 backdrop-filter，深色底上模糊无收益且费 GPU） ---- */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.3s, transform 0.35s var(--ease-out), box-shadow 0.3s;
}

/* ---- 状态徽章 ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.badge-live {
  color: var(--c-cyan);
  border: 1px solid var(--c-cyan-soft);
  background: var(--c-cyan-faint);
}

.badge-trial {
  color: var(--c-purple);
  border: 1px solid var(--c-purple-soft);
  background: var(--c-purple-faint);
}

.badge-design {
  color: var(--text-sub);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
}

.badge-design::before {
  background: var(--text-dim);
}

/* ---- 业务标签芯片 ---- */
.chip {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.02);
}

.chip strong {
  display: block;
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  margin-bottom: 4px;
}

.chip span {
  font-size: 0.9rem;
  color: var(--text-sub);
}

/* ---- H 硬件+接口+AI+脑 横幅 ---- */
.h-strip {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: var(--space-48);
  padding: 28px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  background: linear-gradient(120deg, var(--c-cyan-faint), var(--c-purple-faint));
}

.h-big {
  font-family: var(--font-mono);
  font-size: 3.4rem;
  font-weight: 700;
  line-height: 1;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  flex-shrink: 0;
}

.h-text {
  color: var(--text-sub);
  font-size: 0.95rem;
}

.h-text strong {
  color: var(--text-main);
}

/* ---- 政策时间线 ---- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 44px;
  padding-left: 30px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--grad-brand);
  opacity: 0.6;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--c-cyan);
  box-shadow: var(--glow-cyan-sm);
}

.timeline-item:nth-child(2)::before {
  border-color: var(--c-purple);
  box-shadow: var(--glow-purple-sm);
}

.timeline-item time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.timeline-item h3 {
  margin: 6px 0 8px;
  font-size: 1.15rem;
}

.timeline-item p {
  font-size: 0.93rem;
  color: var(--text-sub);
}

/* ---- vs 对比卡 ---- */
.vs-card {
  text-align: center;
  padding: 28px 20px;
}

.vs-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text-sub);
}

.vs-card p {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.vs-card-hero {
  background: linear-gradient(var(--bg-panel), var(--bg-panel)) padding-box,
    var(--grad-brand) border-box;
  border-color: transparent;
  box-shadow: var(--glow-purple-md);
}

.vs-card-hero h3 {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.vs-card-hero p {
  color: var(--text-main);
}

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--glass-border);
  padding: var(--space-64) 0 var(--space-32);
  background: linear-gradient(180deg, transparent, rgba(10, 15, 30, 0.6));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}

.footer-slogan {
  margin-top: 18px;
  font-size: 0.86rem;
  color: var(--text-sub);
  line-height: 1.9;
}

.footer-slogan span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

.footer-col h4 {
  font-size: 0.88rem;
  letter-spacing: 0.14em;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-col p,
.footer-col li {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 10px;
}

.footer-col a:hover {
  color: var(--c-cyan);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: var(--space-48);
  padding-top: var(--space-24);
  border-top: 1px solid var(--glass-border);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---- 回到顶部 ---- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 1.15rem;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s var(--ease-out),
    border-color 0.3s, box-shadow 0.3s;
  z-index: 50;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top:hover {
  border-color: color-mix(in srgb, var(--c-cyan) 50%, transparent);
  color: var(--c-cyan);
  box-shadow: var(--glow-cyan-sm);
}

/* ---- Hero 滚动指示 ---- */
.scroll-hint {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-dim);
  z-index: 3;
}

.scroll-hint-text {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.34em;
}

.scroll-hint-line {
  width: 1px;
  height: 44px;
  background: linear-gradient(180deg, var(--c-cyan), transparent);
  animation: scrollPulse 2.2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0% {
    transform: scaleY(0);
    transform-origin: top;
    opacity: 0;
  }
  35% {
    transform: scaleY(1);
    opacity: 1;
  }
  100% {
    transform: scaleY(1);
    opacity: 0;
  }
}