/* ===================================================================
   BidCore 色板覆盖 (银青专业 + 科技蓝点缀)
   叠加在 v2.css 上方,覆盖 --r-* 变量为 BidCore 调性
=================================================================== */

:root {
  /* BidCore 银青专业 */
  --bc-brand: #4CB7BB;          /* 主青 */
  --bc-brand-deep: #2F8F95;     /* 深青 */
  --bc-accent: #90A8C8;         /* 淡蓝灰 */
  --bc-accent-soft: #DCE6F2;    /* 极浅蓝灰 */
  --bc-bg: #F5F8F9;
  --bc-panel: #FFFFFF;
  --bc-line: #D9E5E6;
  --bc-text: #202A30;

  /* 科技蓝点缀色 (用于 CTA) */
  --bc-cta: #0066FF;
  --bc-cta-hover: #0052CC;
  --bc-aqua: #00C8E6;

  /* 覆盖 v2 的色变量,让现有组件自动跟着变 */
  --r-blue: #0066FF;            /* CTA 主色保留科技蓝 */
  --r-blue-deep: #2F8F95;       /* hover 用深青 */
  --r-blue-hover: #0052CC;
  --r-aqua: #4CB7BB;            /* aurora / 点缀都用 BidCore 主青 */
  --r-mint: #4CB7BB;            /* 不再用薄荷绿,统一为主青 */
  --r-lime: #90A8C8;            /* 不再用柠绿,改成 BidCore 淡蓝灰 */
  --r-mist: #DCE6F2;            /* 雾灰用 BidCore 淡蓝 */
  --r-bg-soft: #F5F8F9;
  --r-bg-mist: #DCE6F2;

  --r-black: #202A30;           /* 文本不黑,用 BidCore 深灰 */
  --r-title: #202A30;
  --r-body: #2F3942;
  --r-muted: #6A7783;
  --r-subtle: #98A4AE;
  --r-line: #D9E5E6;
  --r-line-soft: #E5ECEC;

  --r-gradient-main: linear-gradient(135deg, #4CB7BB 0%, #90A8C8 50%, #2F8F95 100%);
  --r-gradient-dark: linear-gradient(135deg, #2F8F95 0%, #4CB7BB 100%);
}

/* BidCore 真 LOGO
   nav: 渐变真 logo PNG (1986×1702 ≈ 1.167:1)
   footer: 反白真 logo SVG (黑底更搭) */
.v2-brand-mark { width: 40px !important; height: 34px !important; object-fit: contain; }
.v2-footer-mark { width: 80px !important; height: 70px !important; object-fit: contain !important; }

/* BidCore 全局动态背景: 保留流动概念但视觉差异化 */
.v2-orb { display: none !important; }

/* 流体曲线: 不加模糊, 让动态效果看得见; 银青染色 + 粒子保留 */
.v2-flow {
  display: block !important;
  opacity: 0.7 !important;
}
.v2-flow circle.v2-flow-particle { fill: #4CB7BB !important; }
.v2-flow circle.v2-flow-particle:nth-of-type(2) { fill: #90A8C8 !important; }
.v2-flow circle.v2-flow-particle:nth-of-type(3) { fill: #2F8F95 !important; }
.v2-flow circle.v2-flow-particle:nth-of-type(4) { fill: #DCE6F2 !important; }
.v2-flow circle.v2-flow-particle:nth-of-type(5) { fill: #4CB7BB !important; }

/* SVG flow 渐变停止点改 BidCore 银青调 */
.v2-flow stop:nth-child(1) { stop-color: #DCE6F2 !important; stop-opacity: 0 !important; }
.v2-flow stop:nth-child(2) { stop-color: #4CB7BB !important; stop-opacity: 0.55 !important; }
.v2-flow stop:nth-child(3) { stop-color: #2F8F95 !important; stop-opacity: 0.7 !important; }
.v2-flow stop:nth-child(4) { stop-color: #90A8C8 !important; stop-opacity: 0.55 !important; }
.v2-flow stop:nth-child(5) { stop-color: #DCE6F2 !important; stop-opacity: 0 !important; }

/* aurora 4 朵银青色斑 (BidCore 配色,比公司站点稍亮稍慢) */
.v2-aurora { filter: blur(110px) !important; opacity: 0.85 !important; }
.v2-aurora--1 {
  background: radial-gradient(circle, rgba(76, 183, 187, 0.55), transparent 65%) !important;
  width: 920px !important; height: 920px !important;
  animation: v2-aurora 32s ease-in-out infinite !important;
}
.v2-aurora--2 {
  background: radial-gradient(circle, rgba(144, 168, 200, 0.5), transparent 65%) !important;
  width: 800px !important; height: 800px !important;
  animation: v2-aurora 38s ease-in-out infinite reverse !important;
}
.v2-aurora--3 {
  background: radial-gradient(circle, rgba(47, 143, 149, 0.42), transparent 65%) !important;
  width: 700px !important; height: 700px !important;
  animation: v2-aurora 36s ease-in-out infinite !important;
}
.v2-aurora--4 {
  background: radial-gradient(circle, rgba(220, 230, 242, 0.55), transparent 65%) !important;
  width: 460px !important; height: 460px !important;
  animation: v2-aurora 30s ease-in-out infinite reverse !important;
}

/* 银青对角渐变 + 两个扁椭圆光团缓慢漂移 */
.v2-body {
  background:
    radial-gradient(ellipse 60% 22% at 25% 22%, rgba(76, 183, 187, 0.22), transparent 70%),
    radial-gradient(ellipse 55% 20% at 78% 78%, rgba(144, 168, 200, 0.18), transparent 70%),
    linear-gradient(135deg, #DDF4F2 0%, #EEF3F7 45%, #D8E5F4 100%) !important;
  background-attachment: fixed, fixed, fixed !important;
  background-size: 200% 200%, 200% 200%, 100% 100% !important;
  animation: bc-body-drift 42s ease-in-out infinite alternate;
  position: relative;
}

@keyframes bc-body-drift {
  0%   { background-position: 0% 0%,   100% 100%, 0% 0%; }
  50%  { background-position: 30% 22%, 72% 80%,   0% 0%; }
  100% { background-position: 8% 30%,  88% 65%,   0% 0%; }
}

/* 流体线改成"真圆点"沿渐变路径流动 + 发光
   stroke-dasharray "0 X" + linecap round → 直径=stroke-width 的圆点 (不是短线段)
   stroke 走 SVG 自带 flowGrad 渐变 (银青 stop 已在下方覆盖)
   stroke-width 细 (1.8-2.2)
   stroke-dashoffset 推进 → 圆点沿线流动 */
.v2-flow use {
  stroke-dasharray: 0 13 !important;
  stroke-linecap: round !important;
  stroke-width: 2.2 !important;
  filter:
    drop-shadow(0 0 5px rgba(76, 183, 187, 0.50))
    drop-shadow(0 0 14px rgba(76, 183, 187, 0.25));
  animation: bc-line-flow 3.2s linear infinite;
}
.v2-flow use:nth-of-type(2) {
  stroke-width: 1.8 !important;
  filter:
    drop-shadow(0 0 4px rgba(144, 168, 200, 0.50))
    drop-shadow(0 0 12px rgba(144, 168, 200, 0.25));
  animation-duration: 4.6s;
  animation-direction: reverse;
}
.v2-flow use:nth-of-type(3) {
  stroke-width: 1.6 !important;
  filter:
    drop-shadow(0 0 4px rgba(47, 143, 149, 0.50))
    drop-shadow(0 0 12px rgba(47, 143, 149, 0.25));
  animation-duration: 5.4s;
}
@keyframes bc-line-flow {
  to { stroke-dashoffset: -26; }
}

/* 流体粒子加强发光 */
.v2-flow .v2-flow-particle {
  filter:
    drop-shadow(0 0 8px rgba(76, 183, 187, 0.75))
    drop-shadow(0 0 18px rgba(255, 255, 255, 0.40));
}

@media (prefers-reduced-motion: reduce) {
  .v2-flow use { animation: none; }
}
/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .v2-body { animation: none; }
}

/* ───────── Liquid Glass 通用样式 (双层描边 + 顶部高光 + 软阴影) ─────────
   参考: Apple Liquid Glass / 银玻璃胶囊
   关键三层:
     1. 外层 box-shadow: 微妙的暗色环状描边 (像金属外圈)
     2. inset 顶部高光: 白色反光 (像玻璃凹面被光照到)
     3. 半透明背景 + backdrop-filter: 真玻璃感
============================================================== */
/* Tier C: 静态玻璃 (chips / nav / 不抢戏) */
.bc-glass,
.bc-product-tag,
.bc-feature-scenario,
.bc-anchor-nav {
  position: relative;
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.30) 0%,
    rgba(220, 230, 240, 0.18) 100%) !important;
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.55) !important;
  box-shadow:
    0 0 0 0.5px rgba(76, 110, 120, 0.20),
    inset 0 1.4px 0 rgba(255, 255, 255, 0.85),
    inset 0 -1px 0 rgba(76, 110, 120, 0.10),
    0 1px 2px rgba(47, 65, 80, 0.08),
    0 10px 28px rgba(47, 143, 149, 0.12);
  transition: transform 0.3s var(--tx), box-shadow 0.3s var(--tx), background 0.3s var(--tx);
}

.bc-glass:hover,
.bc-product-tag:hover,
.bc-feature-scenario:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg,
    rgba(255, 255, 255, 0.42) 0%,
    rgba(220, 230, 240, 0.28) 100%) !important;
  box-shadow:
    0 0 0 0.5px rgba(76, 110, 120, 0.26),
    inset 0 1.4px 0 rgba(255, 255, 255, 0.95),
    inset 0 -1px 0 rgba(76, 110, 120, 0.14),
    0 2px 4px rgba(47, 65, 80, 0.10),
    0 16px 36px rgba(47, 143, 149, 0.18) !important;
}

/* ───────── Tier B: ghost 按钮 — 纯扁平 (无光效, 无阴影) ───────── */
.v2-body .v2-btn--ghost {
  background: rgba(255, 255, 255, 0.62) !important;
  border: 1px solid rgba(76, 110, 120, 0.22) !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  transition: background-color 0.2s var(--tx), border-color 0.2s var(--tx),
              color 0.2s var(--tx);
}
.v2-body .v2-btn--ghost:hover {
  background: rgba(255, 255, 255, 0.82) !important;
  border-color: rgba(76, 183, 187, 0.45) !important;
  color: var(--bc-brand-deep) !important;
}

/* ───────── Tier A: primary 按钮 — 纯扁平实色 (无光效, 无阴影) ───────── */
.bc-btn-primary,
.v2-body .v2-btn--primary {
  background: var(--bc-brand) !important;
  color: #fff !important;
  border: 1px solid transparent !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  transition: background-color 0.2s var(--tx);
}
.bc-btn-primary:hover,
.v2-body .v2-btn--primary:hover {
  background: var(--bc-brand-deep) !important;
}
.bc-btn-primary:active,
.v2-body .v2-btn--primary:active {
  background: #25787E !important;
}

/* BidCore 标识小 chip */
.bc-product-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: rgba(76, 183, 187, 0.12);
  border: 1px solid rgba(76, 183, 187, 0.3);
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--bc-brand-deep);
  letter-spacing: 0.16em;
  font-family: var(--font-en);
  text-transform: uppercase;
}
.bc-product-tag-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--bc-brand);
  box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.22);
  animation: bc-pulse 2.4s ease-in-out infinite;
}
@keyframes bc-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.22); }
  50% { box-shadow: 0 0 0 6px rgba(76, 183, 187, 0.06); }
}

/* ───────── features.html / download.html 共用 ───────── */
.bc-page-hero {
  padding: 140px 24px 36px;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
}
.bc-page-hero .bc-product-tag { margin-bottom: 22px; }
.bc-page-hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 0 0 18px;
  color: var(--r-title);
}
.bc-page-hero p {
  font-size: clamp(16px, 1.3vw, 18px);
  color: var(--r-muted);
  line-height: 1.7;
  margin: 0 auto;
  max-width: 720px;
}

.bc-anchor-nav {
  position: sticky;
  top: 78px;
  z-index: 40;
  margin: 16px auto 36px;
  max-width: 1100px;
  padding: 10px 18px;
  background: rgba(245, 248, 249, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.08);
}
.bc-anchor-nav ul {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.bc-anchor-nav a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--r-muted);
  border-radius: 999px;
  transition: all 0.2s var(--tx);
  white-space: nowrap;
}
.bc-anchor-nav a:hover {
  color: var(--bc-brand-deep);
  background: rgba(76, 183, 187, 0.12);
}
@media (max-width: 880px) {
  .bc-anchor-nav { display: none; }
}

/* feature row — 文字为主, 图当作内容下方虚化条带 (放在每个 section 末尾) */
.bc-feature-row {
  position: relative;
  max-width: 880px;
  margin: clamp(72px, 8vw, 120px) auto;
  padding: 24px 24px 0;
  scroll-margin-top: 120px;
  isolation: isolate;
  display: flex;
  flex-direction: column;
}
.bc-feature-text { order: 1; position: relative; }
.bc-feature-art  { order: 2; }

/* 图: 默认 display:none, 点击"适用"chip 展开 + 淡入 */
.bc-feature-art {
  display: none;
  position: relative;
  margin: 28px auto 0;
  max-width: 760px;
  overflow: hidden;
  border-radius: 14px;
  pointer-events: none;
  box-shadow: 0 12px 36px rgba(47, 143, 149, 0.14);
  mask-image: linear-gradient(to bottom,
    transparent 0%,
    rgba(0,0,0,0.6) 14%,
    rgba(0,0,0,0.95) 40%,
    rgba(0,0,0,1) 70%,
    rgba(0,0,0,0.7) 100%);
  -webkit-mask-image: linear-gradient(to bottom,
    transparent 0%,
    rgba(0,0,0,0.6) 14%,
    rgba(0,0,0,0.95) 40%,
    rgba(0,0,0,1) 70%,
    rgba(0,0,0,0.7) 100%);
}
.bc-feature-row.is-open .bc-feature-art {
  display: block;
  opacity: 1;
}
.bc-feature-art img {
  width: 100%;
  height: auto;
  display: block;
}

.bc-feature-num {
  font-family: var(--font-en);
  font-size: clamp(48px, 6vw, 72px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--bc-brand) 0%, var(--bc-brand-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 8px;
  opacity: 0.85;
}

/* 功能状态徽章: 试点可用 / Beta / 规划 / 试点 */
.bc-feature-status {
  display: inline-flex;
  align-items: center;
  padding: 3px 11px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 999px;
  margin: 0 0 12px;
  vertical-align: middle;
}
.bc-feature-status--ready {
  background: rgba(76, 183, 187, 0.15);
  color: var(--bc-brand-deep);
  border: 1px solid rgba(76, 183, 187, 0.32);
}
.bc-feature-status--beta {
  background: rgba(0, 102, 255, 0.10);
  color: #0052CC;
  border: 1px solid rgba(0, 102, 255, 0.28);
  font-family: var(--font-en);
}
.bc-feature-status--planning {
  background: rgba(154, 167, 178, 0.14);
  color: var(--r-muted);
  border: 1px solid rgba(154, 167, 178, 0.28);
}
.bc-feature-text h2 {
  font-size: clamp(26px, 2.6vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--r-title);
  margin: 0 0 14px;
}
.bc-feature-text .bc-lead {
  font-size: clamp(15px, 1.2vw, 17px);
  color: var(--r-muted);
  line-height: 1.75;
  margin: 0 0 22px;
}
.bc-feature-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 11px;
}
.bc-feature-list li {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--r-body);
  padding-left: 22px;
  position: relative;
}
.bc-feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bc-brand), var(--bc-brand-deep));
  box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.16);
}
.bc-feature-list li strong {
  color: var(--r-title);
  font-weight: 700;
}
.bc-feature-scenario {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(76, 183, 187, 0.1);
  border: 1px solid rgba(76, 183, 187, 0.25);
  border-radius: 999px;
  font-size: 13px;
  color: var(--bc-brand-deep);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  align-self: flex-start;
  transition: background-color 0.2s, border-color 0.2s;
}
.bc-feature-scenario:hover {
  background: rgba(76, 183, 187, 0.18);
  border-color: rgba(76, 183, 187, 0.4);
}
.bc-feature-scenario::before {
  content: "适用";
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--bc-brand);
  font-weight: 700;
  padding-right: 8px;
  border-right: 1px solid rgba(76, 183, 187, 0.3);
}
/* 末尾下拉箭头 (V 形, 用 border 画) — 展开时翻转 180° */
.bc-feature-scenario::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 4px;
  border-right: 1.6px solid currentColor;
  border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.3s var(--tx);
  opacity: 0.7;
}
.bc-feature-row.is-open .bc-feature-scenario::after {
  transform: rotate(225deg) translate(0, 0);
}
.bc-feature-row.is-open .bc-feature-scenario {
  background: rgba(76, 183, 187, 0.22);
  border-color: rgba(76, 183, 187, 0.5);
}

@media (max-width: 820px) {
  .bc-feature-row { padding: 16px 18px 0; }
  .bc-feature-art { height: 160px; margin-top: 40px; }
}

/* "by Wenshuo Tech" 署名样式 */
.bc-powered-by {
  font-size: 12px;
  color: var(--r-subtle);
  letter-spacing: 0.04em;
}
.bc-powered-by a {
  color: var(--bc-brand-deep);
  text-decoration: none;
  font-weight: 500;
}
.bc-powered-by a:hover {
  color: var(--bc-cta);
}

/* BidCore 专属银青渐变 (用于大字标题) */
.bc-grad {
  background: linear-gradient(135deg, var(--bc-brand) 0%, var(--bc-brand-deep) 50%, var(--bc-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 主视觉 mockup 浮动容器 */
.bc-stage {
  position: relative;
  margin: 56px auto 0;
  max-width: 1280px;
  padding: 0 24px;
}
.bc-stage-frame {
  position: relative;
  /* 玻璃边框去掉,slides 直接漂浮在背景上 */
  background: none;
  border: none;
  box-shadow: none;
  padding: 0;
  overflow: visible;
  perspective: 1400px;
}
.bc-stage-caption {
  margin-top: 22px;
  text-align: center;
  font-size: 13px;
  color: var(--r-subtle);
  letter-spacing: 0.04em;
}

/* stage 与下一节的间距 (适中, 不空旷不挤) */
#stage + .v2-section { padding-top: clamp(56px, 6vw, 88px) !important; }
#stage { padding-bottom: 32px !important; }

/* ───────── 9 slides coverflow carousel (中间 65%, 两侧 30% 显示偷窥) ───────── */
.bc-carousel {
  position: relative;
  width: 100%;
  aspect-ratio: 100 / 37;         /* 容纳 65% 宽 16:9 中间 slide + 上下呼吸空间 */
  margin: 0 auto;
  transform-style: preserve-3d;
}
.bc-slide {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 65%;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 36px rgba(47, 143, 149, 0.18);
  /* 只过渡 transform/opacity/filter (GPU 加速,不触发 reflow) */
  transition:
    transform 1.6s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 1.6s cubic-bezier(0.16, 1, 0.3, 1),
    filter 1.6s cubic-bezier(0.16, 1, 0.3, 1);
  /* 默认隐形 */
  transform: translate(-50%, -50%) scale(0.4);
  opacity: 0;
  filter: blur(10px);
  pointer-events: none;
  will-change: transform, opacity, filter;
}
.bc-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.bc-slide.is-current {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  filter: blur(0);
  z-index: 3;
  pointer-events: auto;
  box-shadow: 0 32px 64px rgba(47, 143, 149, 0.28);
}
.bc-slide.is-prev {
  transform: translate(-50%, -50%) translateX(-55%) scale(0.46);
  opacity: 0.55;
  filter: blur(3px);
  z-index: 2;
}
.bc-slide.is-next {
  transform: translate(-50%, -50%) translateX(55%) scale(0.46);
  opacity: 0.55;
  filter: blur(3px);
  z-index: 2;
}
@media (max-width: 820px) {
  .bc-carousel { aspect-ratio: 16 / 9; }
  .bc-slide { width: 90%; }
  .bc-slide.is-current { transform: translate(-50%, -50%) scale(1); }
  .bc-slide.is-prev,
  .bc-slide.is-next { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .bc-slide { transition: opacity 0.3s ease; }
}

/* 三大核心价值 - 数字标号卡 */
.bc-value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.bc-value-card {
  position: relative;
  padding: 36px 32px 32px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(76, 183, 187, 0.18);
  border-radius: 22px;
  box-shadow: 0 8px 24px rgba(47, 143, 149, 0.07);
  transition: transform 0.35s var(--tx), box-shadow 0.35s var(--tx), border-color 0.35s var(--tx);
}
.bc-value-card:hover {
  transform: translateY(-4px);
  border-color: rgba(76, 183, 187, 0.32);
  box-shadow: 0 22px 48px rgba(47, 143, 149, 0.14);
}
.bc-value-num {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--bc-brand-deep);
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.bc-value-num::before {
  content: "";
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--bc-brand), var(--bc-accent));
  border-radius: 2px;
}
.bc-value-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--r-title);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.bc-value-card p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--r-muted);
  margin: 0;
}
@media (max-width: 980px) {
  .bc-value-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .bc-value-grid { grid-template-columns: 1fr; gap: 12px; }
  .bc-value-card { padding: 26px 24px; }
}

/* 功能 mini-bento (主页 4 卡 → /features.html) */
.bc-feat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 56px;
}
.bc-feat-card {
  display: flex;
  flex-direction: column;
  padding: 28px 26px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.16);
  border-radius: 20px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.06);
  transition: all 0.3s var(--tx);
  text-decoration: none;
  color: inherit;
}
.bc-feat-card:hover {
  transform: translateY(-3px);
  border-color: rgba(76, 183, 187, 0.3);
  box-shadow: 0 16px 36px rgba(47, 143, 149, 0.12);
}
.bc-feat-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(76, 183, 187, 0.18), rgba(144, 168, 200, 0.18));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--bc-brand-deep);
  margin-bottom: 18px;
}
.bc-feat-icon svg { width: 20px; height: 20px; }
.bc-feat-card h4 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--r-title);
  margin: 0 0 8px;
  letter-spacing: -0.005em;
}
.bc-feat-card p {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--r-muted);
  margin: 0;
  flex: 1;
}
.bc-feat-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--bc-brand-deep);
  transition: gap 0.3s var(--tx);
}
.bc-feat-card:hover .bc-feat-more {
  gap: 12px;
  color: var(--bc-cta);
}
@media (max-width: 980px) {
  .bc-feat-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .bc-feat-grid { grid-template-columns: 1fr; gap: 12px; }
}

/* 谁在用 - 受众卡 */
.bc-audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.bc-audience-card {
  padding: 30px 30px 32px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.16);
  border-radius: 22px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.05);
  transition: all 0.3s var(--tx);
}
.bc-audience-card:hover {
  transform: translateY(-3px);
  border-color: rgba(76, 183, 187, 0.3);
  box-shadow: 0 16px 36px rgba(47, 143, 149, 0.12);
}
.bc-audience-tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--bc-brand-deep);
  margin-bottom: 10px;
  font-weight: 600;
}
.bc-audience-card h4 {
  font-size: 19px;
  font-weight: 700;
  color: var(--r-title);
  margin: 0 0 14px;
  letter-spacing: -0.005em;
}
.bc-audience-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.bc-audience-card li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--r-muted);
  padding-left: 18px;
  position: relative;
}
.bc-audience-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bc-brand);
  box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.18);
}
@media (max-width: 980px) {
  .bc-audience-grid { grid-template-columns: 1fr; }
}

/* ───────── AI-输出感文字逐行扫入 (用于 timeline) ───────── */
.bc-ai-line {
  clip-path: inset(0 105% 0 0);
  transition: clip-path 1.5s cubic-bezier(0.5, 0, 0.2, 1);
  will-change: clip-path;
}
.bc-ai-line.is-typed { clip-path: inset(0 0 0 0); }
.bc-ai-line--h { transition-duration: 0.7s; }
.bc-ai-line--p { transition-duration: 1.5s; }
@media (prefers-reduced-motion: reduce) {
  .bc-ai-line { clip-path: none !important; transition: none !important; }
}

/* ───────── timeline 区背景跟随当前 step 滑动 ───────── */
.v2-method#workflow { position: relative; isolation: isolate; }
.v2-method#workflow::before {
  content: "";
  position: absolute;
  inset: -8% -5%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 26% 55% at center, rgba(76, 183, 187, 0.20), transparent 70%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: 8% 30%;
  transition: background-position 1.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.v2-method#workflow[data-active-step="1"]::before { background-position: 8% 25%; }
.v2-method#workflow[data-active-step="2"]::before { background-position: 28% 50%; }
.v2-method#workflow[data-active-step="3"]::before { background-position: 50% 72%; }
.v2-method#workflow[data-active-step="4"]::before { background-position: 72% 50%; }
.v2-method#workflow[data-active-step="5"]::before { background-position: 92% 28%; }
@media (prefers-reduced-motion: reduce) {
  .v2-method#workflow::before { transition: none !important; }
}

/* ───────── timeline 卡片化 (BidCore 覆盖) ───────── */
/* 干掉 v2 的左侧渐变竖线,卡片独立呼吸 */
.v2-timeline::before { display: none !important; }

/* 数字徽章缩小 */
.v2-timeline-num {
  width: 38px !important;
  height: 38px !important;
  font-size: 12.5px !important;
  font-family: var(--font-en);
  font-weight: 700;
  background: linear-gradient(135deg, var(--bc-brand) 0%, var(--bc-brand-deep) 100%) !important;
  box-shadow:
    0 6px 16px rgba(47, 143, 149, 0.32),
    0 0 0 4px rgba(255, 255, 255, 0.65),
    0 0 0 5px rgba(76, 183, 187, 0.10) !important;
  top: 22px !important;
  left: 22px !important;
}

/* 每一步是独立圆角卡 + 间隔 (无 backdrop-filter,保持渲染轻量) */
.v2-timeline-step {
  padding: 22px 28px 24px 78px !important;
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.16);
  border-radius: 18px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.06);
  transition: transform 0.35s var(--tx), box-shadow 0.35s var(--tx), border-color 0.35s var(--tx);
}
.v2-timeline-step:hover {
  transform: translateY(-2px);
  border-color: rgba(76, 183, 187, 0.3);
  box-shadow: 0 14px 32px rgba(47, 143, 149, 0.12);
}
.v2-timeline-step:last-child {
  padding-bottom: 24px !important;
  margin-bottom: 0;
}

.v2-timeline-text h3 {
  font-size: 18px !important;
  margin: 4px 0 8px !important;
  font-weight: 700;
}
.v2-timeline-text p {
  font-size: 14.5px !important;
  line-height: 1.7 !important;
}

@media (max-width: 640px) {
  .v2-timeline-step { padding: 18px 22px 20px 64px !important; }
  .v2-timeline-num { top: 18px !important; left: 18px !important; }
}

/* ───────── 8 卡 mini-bento (纯图标+标题+描述,截图留给 features.html 详情页) ───────── */
.bc-feat-grid--eight {
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.bc-feat-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}
.bc-feat-card .bc-feat-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  margin-bottom: 14px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92) 0%, rgba(220, 230, 242, 0.7) 100%);
  border: 1px solid rgba(255, 255, 255, 0.85);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.95),
    inset 0 -1px 0 rgba(76, 183, 187, 0.18),
    0 4px 10px rgba(47, 143, 149, 0.14);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.bc-feat-card .bc-feat-icon svg { width: 28px; height: 28px; display: block; }
.bc-feat-card h4 {
  font-size: 16px;
  margin-bottom: 6px;
}
.bc-feat-card p {
  font-size: 13px;
  line-height: 1.6;
}
@media (max-width: 1100px) {
  .bc-feat-grid--eight { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 820px) {
  .bc-feat-grid--eight { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .bc-feat-grid--eight { grid-template-columns: 1fr; }
}

/* ───────── 一行不换行的 helper (用于 "覆盖一份标书的完整生命周期。") ───────── */
.bc-nowrap {
  white-space: nowrap;
}
@media (max-width: 720px) {
  .bc-nowrap { white-space: normal; }
}

/* ───────── Hero mockup 占位框 (等用户给 AI 生成的产品图) ───────── */
.bc-stage-frame--placeholder {
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed rgba(76, 183, 187, 0.42);
  background:
    linear-gradient(135deg, rgba(76, 183, 187, 0.08) 0%, rgba(144, 168, 200, 0.10) 100%);
}
.bc-stage-frame--placeholder span {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--bc-brand-deep);
  opacity: 0.7;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.78);
  border-radius: 999px;
}

/* 下载 CTA - 直接漂浮在背景上 (无玻璃卡) */
.bc-download-cta {
  margin: 56px auto 0;
  max-width: 880px;
  padding: 24px 24px 16px;
  position: relative;
  text-align: center;
}
.bc-download-cta h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--r-title);
  margin: 0 0 14px;
}
.bc-download-cta p {
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.7;
  color: var(--r-muted);
  margin: 0 0 32px;
}
@media (max-width: 640px) {
  .bc-download-cta { padding: 16px 18px 8px; }
}

/* ═══════════════════════════════════════════════════════════════════
   download.html 专属样式
   ═══════════════════════════════════════════════════════════════════ */

/* 单 Windows 卡 + 主图 (左卡 右图) */
.bc-download-single {
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(0, 1.4fr);
  gap: 36px;
  max-width: 1180px;
  margin: 0 auto;
  align-items: center;
}
@media (max-width: 980px) {
  .bc-download-single { grid-template-columns: 1fr; gap: 28px; }
}

/* 平台卡 (banner glass) */
.bc-platform-card {
  position: relative;
  padding: 28px 30px 26px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.18);
  border-radius: 20px;
  box-shadow: 0 8px 24px rgba(47, 143, 149, 0.08);
}
.bc-platform-card--solo {
  padding: 36px 38px 32px;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92) 0%, rgba(245, 252, 251, 0.78) 100%);
  border: 1px solid rgba(76, 183, 187, 0.28);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.95),
    0 16px 40px rgba(47, 143, 149, 0.14);
}

.bc-platform-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.bc-platform-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(76, 183, 187, 0.16), rgba(144, 168, 200, 0.18));
  border: 1px solid rgba(76, 183, 187, 0.28);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--bc-brand-deep);
  flex-shrink: 0;
}
.bc-platform-icon svg { width: 24px; height: 24px; }
.bc-platform-head h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--r-title);
  margin: 0 0 2px;
  letter-spacing: -0.005em;
}
.bc-platform-head p {
  font-size: 13.5px;
  color: var(--r-muted);
  margin: 0;
}

.bc-platform-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.bc-platform-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: 999px;
  background: rgba(154, 167, 178, 0.14);
  color: var(--r-muted);
  border: 1px solid rgba(154, 167, 178, 0.22);
}
.bc-platform-badge--beta {
  background: rgba(76, 183, 187, 0.16);
  color: var(--bc-brand-deep);
  border-color: rgba(76, 183, 187, 0.32);
}
.bc-platform-version {
  font-size: 12.5px;
  color: var(--r-subtle);
  font-family: var(--font-en);
  letter-spacing: 0.04em;
}

.bc-platform-bullets {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 8px;
}
.bc-platform-bullets li {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--r-body);
  padding-left: 18px;
  position: relative;
}
.bc-platform-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bc-brand);
  box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.16);
}

.bc-platform-note {
  font-size: 12.5px;
  color: var(--r-subtle);
  margin: 14px 0 0;
  text-align: center;
  font-style: italic;
}

/* 主界面预览 */
.bc-download-preview {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 22px 60px rgba(47, 143, 149, 0.18),
    0 4px 14px rgba(47, 143, 149, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.85);
  background: linear-gradient(135deg, rgba(76, 183, 187, 0.06), rgba(144, 168, 200, 0.06));
  transform: perspective(1200px) rotateY(-3deg) rotateX(2deg);
  transition: transform 0.6s var(--tx);
}
.bc-download-preview:hover {
  transform: perspective(1200px) rotateY(0deg) rotateX(0deg);
}
.bc-download-preview img {
  width: 100%;
  height: auto;
  display: block;
}
@media (max-width: 980px) {
  .bc-download-preview {
    transform: none;
    max-width: 760px;
    margin: 0 auto;
  }
  .bc-download-preview:hover { transform: none; }
}

/* 系统要求两栏 */
.bc-requirements-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 40px;
}
.bc-req-col {
  padding: 28px 30px 26px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.18);
  border-radius: 20px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.06);
}
.bc-req-col--recommended {
  border-color: rgba(76, 183, 187, 0.32);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(244, 252, 251, 0.82));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.95),
    0 12px 32px rgba(47, 143, 149, 0.12);
}
.bc-req-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--r-title);
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(76, 183, 187, 0.18);
}
.bc-req-list {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
}
.bc-req-list dt {
  font-size: 13px;
  color: var(--r-muted);
  font-weight: 500;
}
.bc-req-list dd {
  font-size: 13.5px;
  color: var(--r-body);
  margin: 0;
  line-height: 1.55;
}
@media (max-width: 820px) {
  .bc-requirements-grid { grid-template-columns: 1fr; }
  .bc-req-list { grid-template-columns: 90px 1fr; }
}

/* 更新日志 timeline */
.bc-changelog {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  max-width: 880px;
}
.bc-changelog-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 28px;
  padding: 24px 28px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(76, 183, 187, 0.16);
  border-radius: 18px;
  box-shadow: 0 6px 20px rgba(47, 143, 149, 0.06);
}
.bc-changelog-version {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.bc-changelog-tag {
  display: inline-flex;
  align-self: flex-start;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.06em;
  font-weight: 600;
  border-radius: 999px;
  background: rgba(154, 167, 178, 0.14);
  color: var(--r-muted);
  border: 1px solid rgba(154, 167, 178, 0.22);
}
.bc-changelog-tag--current {
  background: rgba(76, 183, 187, 0.16);
  color: var(--bc-brand-deep);
  border-color: rgba(76, 183, 187, 0.36);
}
.bc-changelog-version h4 {
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--r-title);
}
.bc-changelog-version time {
  font-size: 12.5px;
  color: var(--r-subtle);
  font-family: var(--font-en);
}
.bc-changelog-notes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.bc-changelog-notes li {
  font-size: 14px;
  line-height: 1.65;
  color: var(--r-body);
  padding-left: 18px;
  position: relative;
}
.bc-changelog-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--bc-brand);
  box-shadow: 0 0 0 3px rgba(76, 183, 187, 0.16);
}
@media (max-width: 720px) {
  .bc-changelog-item { grid-template-columns: 1fr; gap: 14px; }
}