/* ============================================================
   沙香科技官网 v2 — 深色科技风
   设计语言（2026 范式）：极光渐变 + 噪点 + Bento 网格 + 发光描边
   品牌色取自 logo：深蓝底 + 红；辅助青蓝呼应产品摄影冷色调
   ============================================================ */

:root {
  --bg-0: #04070f;
  --bg-1: #070b16;
  --bg-2: rgba(148, 178, 255, 0.04);
  --line: rgba(148, 178, 255, 0.14);
  --text: #e9eef8;
  --muted: #93a0b8;
  --brand: #ff3d5a;
  --cyan: #4cc3ff;
  --grad: linear-gradient(96deg, var(--cyan), var(--brand));
  --radius: 16px;
  --container: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-0);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 噪点颗粒：消除渐变色带、增加质感（subtle grain） */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2000;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ============================================================
   导航
   ============================================================ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(4, 7, 15, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--line);
}
.nav-wrap { display: flex; align-items: center; gap: 20px; height: 68px; }
.brand { flex-shrink: 0; }
/* 反白版 logo（tools/make_logo_light.py）：黑字提亮为白、彩色保留色相，深底页面直接融合 */
.brand-logo { height: 38px; width: auto; }
.nav { display: flex; align-items: center; gap: 26px; margin-left: auto; font-size: 14.5px; }
.nav a { color: var(--muted); transition: color 0.2s; }
.nav a:hover { color: var(--text); }
.nav-cta {
  padding: 7px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text) !important;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.nav-cta:hover { border-color: var(--brand); box-shadow: 0 0 18px rgba(255, 61, 90, 0.25); }

.lang-toggle {
  background: none;
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 999px;
  width: 44px;
  height: 32px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  flex-shrink: 0;
}
.lang-toggle:hover { color: var(--text); border-color: var(--cyan); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.25s, opacity 0.25s; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   Hero — 极光 + 网格（无照片，对比度完全可控）
   ============================================================ */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; overflow: hidden; }

/* 三团极光：青 / 品红 / 深蓝，各自缓慢漂移呼吸 */
.aurora { position: absolute; inset: -20%; filter: blur(90px); }
.aurora i { position: absolute; border-radius: 50%; opacity: 0.5; }
.aurora i:nth-child(1) {
  width: 44vw; height: 44vw; left: -6%; top: -12%;
  background: radial-gradient(circle, rgba(76, 195, 255, 0.55), transparent 65%);
  animation: drift1 14s ease-in-out infinite alternate;
}
.aurora i:nth-child(2) {
  width: 40vw; height: 40vw; right: -8%; top: 8%;
  background: radial-gradient(circle, rgba(255, 61, 90, 0.38), transparent 65%);
  animation: drift2 18s ease-in-out infinite alternate;
}
.aurora i:nth-child(3) {
  width: 46vw; height: 46vw; left: 28%; bottom: -26%;
  background: radial-gradient(circle, rgba(64, 72, 220, 0.4), transparent 65%);
  animation: drift3 22s ease-in-out infinite alternate;
}
@keyframes drift1 { to { transform: translate(9vw, 7vh) scale(1.15); } }
@keyframes drift2 { to { transform: translate(-8vw, 10vh) scale(0.9); } }
@keyframes drift3 { to { transform: translate(6vw, -8vh) scale(1.1); } }

/* 科技网格：向下的渐隐遮罩 */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(76, 195, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76, 195, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, transparent 0%, #000 40%, transparent 92%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 40%, transparent 92%);
}

.hero-inner { position: relative; z-index: 1; padding-top: 68px; }
.hero-eyebrow {
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 12px;
}
/* eyebrow 前的脉冲光点：生命感 */
.hero-eyebrow::before {
  content: "";
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px 2px rgba(76, 195, 255, 0.8);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.35; } }

.hero-title {
  font-size: clamp(42px, 7vw, 84px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
  margin-bottom: 26px;
  text-wrap: balance;
}
.hero-sub { max-width: 640px; color: var(--muted); font-size: 17px; margin-bottom: 40px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 8px 30px rgba(76, 195, 255, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 44px rgba(255, 61, 90, 0.4); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--cyan); transform: translateY(-2px); }

/* ============================================================
   技术词条跑马灯
   ============================================================ */
.marquee {
  border-block: 1px solid var(--line);
  background: rgba(148, 178, 255, 0.03);
  overflow: hidden;
  position: relative;
}
/* 两侧渐隐，词条像从光雾里滚出 */
.marquee::before, .marquee::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 120px;
  z-index: 1;
  pointer-events: none;
}
.marquee::before { left: 0; background: linear-gradient(90deg, var(--bg-0), transparent); }
.marquee::after { right: 0; background: linear-gradient(-90deg, var(--bg-0), transparent); }
.marquee-track {
  display: flex;
  gap: 48px;
  width: max-content;
  padding: 16px 0;
  animation: scroll 36s linear infinite;
}
.marquee-track span {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 48px;
}
.marquee-track span::after { content: "✦"; color: var(--brand); font-size: 11px; }
@keyframes scroll { to { transform: translateX(-50%); } }

/* ============================================================
   区块通用
   ============================================================ */
.section { padding: 104px 0; }
.section-alt {
  background: var(--bg-1);
  /* 顶部一条极细渐变分隔线，代替粗边框 */
  border-block: 1px solid transparent;
  border-image: linear-gradient(90deg, transparent, rgba(76, 195, 255, 0.35), transparent) 1;
}

.section-head { margin-bottom: 52px; max-width: 780px; }
.eyebrow {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: var(--brand);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--brand); }
.section-head h2 { font-size: clamp(30px, 4vw, 44px); font-weight: 800; line-height: 1.25; }
.section-desc { color: var(--muted); margin-top: 16px; font-size: 16.5px; }

/* ============================================================
   关于 — Bento 网格
   ============================================================ */
.bento { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: auto; gap: 18px; }
.bento-text { grid-column: 1 / 3; padding: 30px 32px; }
.bento-photo { grid-column: 3 / 5; min-height: 300px; }
.bento-stat { padding: 22px; }
.bento-text, .bento-photo, .bento-stat {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-2);
  position: relative;
  overflow: hidden;
}
/* Bento 卡顶部一线品牌光 */
.bento-text::before, .bento-photo::before, .bento-stat::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(76, 195, 255, 0.5), transparent);
}
.bento-text p { color: var(--muted); margin-bottom: 16px; font-size: 15px; }
.bento-text p:first-child { color: var(--text); }
/* 完整显示不裁剪：PPT 原图左右各约 40% 会被 cover 裁掉（CCTV 标志即因此丢失） */
.bento-photo { display: flex; }
.bento-photo img {
  width: 100%;
  height: auto;
  max-height: 100%;
  object-fit: contain;
  margin: auto;
  border-radius: 8px;
}
.bento-stat strong { display: block; font-size: 19px; margin-bottom: 5px; }
.bento-stat span { font-size: 13px; color: var(--muted); }
.bento-stat:hover { border-color: rgba(76, 195, 255, 0.45); transition: border-color 0.25s; }

/* ============================================================
   痛点
   ============================================================ */
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 52px; }
.pain-grid-3 { grid-template-columns: repeat(3, 1fr); }
.pain {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  background: var(--bg-2);
}
/* 左上角缺角高亮条：批次感 */
.pain::before {
  content: "";
  display: block;
  width: 26px; height: 3px;
  border-radius: 2px;
  background: var(--grad);
  margin-bottom: 10px;
}
.pain h4 { font-size: 15px; margin-bottom: 4px; }
.pain p { font-size: 13px; color: var(--muted); }

/* ============================================================
   产品卡 — 发光描边 + 镂空图
   ============================================================ */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background:
    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
    linear-gradient(140deg, rgba(76, 195, 255, 0.4), rgba(148, 178, 255, 0.08) 40%, rgba(255, 61, 90, 0.35)) border-box;
  border: 1px solid transparent;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(76, 195, 255, 0.12);
  background:
    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
    linear-gradient(140deg, rgba(76, 195, 255, 0.75), rgba(148, 178, 255, 0.15) 40%, rgba(255, 61, 90, 0.65)) border-box;
}

/* 镂空产品图的舞台：底部品牌辉光托底 */
.product-media {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 34px 28px;
  min-height: 250px;
  background:
    radial-gradient(90% 70% at 50% 105%, rgba(76, 195, 255, 0.16), transparent 60%),
    radial-gradient(50% 40% at 50% 100%, rgba(255, 61, 90, 0.10), transparent 70%),
    var(--bg-0);
}
.product-media img {
  max-height: 230px;
  width: auto;
  max-width: 100%;
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.55));
  transition: transform 0.3s;
}
.card:hover .product-media img { transform: scale(1.06); }
/* 背景复杂的实拍图：不镂空，统一描边容器 */
.product-media img.framed {
  border-radius: 12px;
  border: 1px solid rgba(233, 238, 248, 0.22);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45);
  filter: none;
}

.product-body { padding: 20px 22px 24px; }
.product-body h3 { font-size: 17px; margin-bottom: 12px; }
.product-note { font-size: 13.5px; color: var(--muted); margin-bottom: 12px; }

/* 功能标签：等宽网格对齐，杜绝换行参差 */
.tags {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 7px;
}
.tags span {
  font-size: 12px;
  color: var(--cyan);
  background: rgba(76, 195, 255, 0.08);
  border: 1px solid rgba(76, 195, 255, 0.22);
  padding: 5px 4px;
  border-radius: 8px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* 英文模式：标签词更长，放宽格子并缩小字号防截断 */
html[lang="en"] .tags { grid-template-columns: repeat(auto-fill, minmax(124px, 1fr)); }
html[lang="en"] .tags span { font-size: 11px; }

.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: stretch; }
.product-hero { display: flex; flex-direction: column; }
.product-hero .product-media { flex: 1; min-height: 340px; }
.product-hero .product-media img { max-height: 300px; }
.scene-side { border-radius: var(--radius); border: 1px solid var(--line); object-fit: cover; width: 100%; }

/* ============================================================
   场景图
   ============================================================ */
.scene-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 22px; margin-top: 22px; }
.scene-grid img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.scene-grid img:hover { transform: scale(1.015); }

/* ============================================================
   平台/定制卡
   ============================================================ */
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.platform-media {
  position: relative;
  background: var(--bg-0);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 22px;
  min-height: 230px;
  overflow: hidden;
}
.platform-media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 50% 0%, rgba(76, 195, 255, 0.10), transparent 60%);
}

/* 多图卡：局部滑动展示。截图统一高度、宽度按原始比例自适应，
   超宽截图自然超出卡片形成"滑动看局部"，宽度永远匹配内容 */
.slider {
  display: block;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.slider::-webkit-scrollbar { display: none; }
.slides { display: flex; gap: 16px; align-items: flex-end; }
.slides figure {
  flex: 0 0 auto;
  scroll-snap-align: center;
  margin: 0 4px;
  display: flex;
  justify-content: center;
}
.slides img {
  height: 176px;
  width: auto;
  max-width: none;
  border-radius: 10px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}
/* 手机竖屏截图稍高，底对齐时视觉平衡 */
.slides img.shot-phone { height: 196px; }
/* 指示点 */
.dots {
  position: absolute;
  left: 0; right: 0; bottom: 8px;
  display: flex;
  justify-content: center;
  gap: 7px;
  z-index: 2;
}
.dots button {
  width: 7px; height: 7px;
  border-radius: 50%;
  border: none;
  padding: 0;
  cursor: pointer;
  background: rgba(148, 178, 255, 0.25);
  transition: background 0.2s, transform 0.2s;
}
.dots button.active {
  background: var(--cyan);
  transform: scale(1.35);
  box-shadow: 0 0 8px rgba(76, 195, 255, 0.7);
}
.shot-main {
  width: 100%;
  max-width: 420px;
  border-radius: 10px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}
.shot-wide { max-width: 480px; }
.shot-phone {
  width: 96px;
  flex-shrink: 0;
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}
.feature-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 9px;
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--grad);
}

/* ============================================================
   联系
   ============================================================ */
.contact {
  background:
    radial-gradient(70% 100% at 50% 100%, rgba(255, 61, 90, 0.10), transparent 70%),
    var(--bg-1);
  text-align: center;
}
.contact-inner { max-width: 720px; }
.contact-title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  display: flex;
  gap: 22px;
  justify-content: center;
  flex-wrap: wrap;
}
.contact-sub { color: var(--muted); margin: 18px 0 44px; }
.contact-card {
  display: inline-flex;
  align-items: center;
  gap: 36px;
  padding: 32px 44px;
  border-radius: 20px;
  background:
    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
    linear-gradient(140deg, rgba(76, 195, 255, 0.4), rgba(255, 61, 90, 0.4)) border-box;
  border: 1px solid transparent;
  text-align: left;
}
.qrcode { width: 148px; height: 148px; border-radius: 12px; }
.contact-mail {
  font-size: 21px;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  margin-bottom: 10px;
}
.contact-mail:hover { filter: brightness(1.2); }
.contact-info p { font-size: 14px; color: var(--muted); margin-bottom: 4px; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { border-top: 1px solid var(--line); padding: 30px 0; }
.footer-wrap { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px; }
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-brand .brand-logo { height: 30px; }
.footer-brand span { font-size: 14px; color: var(--muted); }
.footer-copy { font-size: 13px; color: var(--muted); }

/* ============================================================
   FAQ 手风琴（原生 details/summary，零 JS；描边手法复用 .card）
   ============================================================ */
.faq-list { display: grid; gap: 12px; max-width: 860px; margin: 0 auto; }
.faq-item {
  border-radius: 14px;
  background:
    linear-gradient(var(--bg-1), var(--bg-1)) padding-box,
    linear-gradient(140deg, rgba(76, 195, 255, 0.28), rgba(148, 178, 255, 0.06) 40%, rgba(255, 61, 90, 0.24)) border-box;
  border: 1px solid transparent;
  padding: 16px 22px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--text);
}
.faq-item summary::-webkit-details-marker { display: none; }
/* 用 + 号旋转做展开指示，免图标资源 */
.faq-item summary::after { content: '+'; color: var(--muted); font-size: 18px; transition: transform 0.2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { margin-top: 12px; font-size: 14px; line-height: 1.8; color: var(--muted); }


/* ============================================================
   滚动淡入
   ============================================================ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .product-grid, .pain-grid, .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .pain-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-text, .bento-photo { grid-column: 1 / 3; }
  .bento-photo { min-height: 240px; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .menu-toggle { display: flex; margin-left: auto; }
  .lang-toggle { margin-left: auto; }
  .menu-toggle { margin-left: 0; }
  .nav {
    position: fixed;
    top: 68px;
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 28px;
    gap: 18px;
    background: rgba(4, 7, 15, 0.96);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    display: none;
  }
  .nav.open { display: flex; }

  .hero { min-height: 88vh; }
  .hero-sub { font-size: 15.5px; }
  .aurora { filter: blur(60px); }

  .feature-row, .scene-grid { grid-template-columns: 1fr; }
  .stats { gap: 14px; }
  .contact-card { flex-direction: column; text-align: center; gap: 20px; padding: 28px; }
}

@media (max-width: 520px) {
  .product-grid, .pain-grid, .pain-grid-3, .platform-grid, .bento { grid-template-columns: 1fr; }
  .bento-text, .bento-photo { grid-column: auto; }
  .hero-actions .btn { width: 100%; text-align: center; }
  .product-media { min-height: 210px; }
}

/* 尊重系统减弱动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .aurora i, .marquee-track, .hero-eyebrow::before { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .btn, .bento-stat { transition: none; }
}