/* =========================================================
   美益润滑油 · 设计系统 v5 (对齐 oxyoco / MYAEGIS 国际站质感)
   - 配色:品牌红 #d32f2f + 海军蓝 #0f2542 + 白/浅灰(oxyoco 体系)
   - 字体:Inter + Noto Sans SC(精致无衬线,中文可极细字重 200)
   - 动效:GSAP 滚动时间轴 + THREE.js 轻量粒子背景
   - 导航:仅 logo + 三条线,滚动自动变色;明暗自动跟随系统
   ========================================================= */

:root{
  color-scheme: light;

  --brand: #d32f2f;            /* 品牌红 */
  --brand-light: #e53935;     /* 红亮,用于强调/渐变 */
  --navy: #0f2542;            /* 海军蓝 */
  --navy-soft: #1a3056;

  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --fg: #0f1729;
  --muted: #6b7280;
  --line: rgba(15,23,41,.12);
  --line-strong: rgba(15,23,41,.22);
  --nav-fg-top: #ffffff;
  --nav-fg: var(--fg);
  --nav-bg-solid: rgba(255,255,255,.78);
  --nav-border: var(--line);

  --fs-xs: .72rem;
  --fs-sm: .88rem;
  --fs-base: .98rem;
  --fs-lg: clamp(1rem, .5vw + .92rem, 1.2rem);
  --fs-xl: clamp(1.3rem, 2vw + .9rem, 2rem);
  --fs-2xl: clamp(1.9rem, 3.6vw + 1.1rem, 3.4rem);
  --fs-hero: clamp(3rem, 8.6vw + .4rem, 7.6rem);

  --sp-sm: clamp(12px, 1vw + 8px, 20px);
  --sp-md: clamp(20px, 2vw + 12px, 40px);
  --sp-lg: clamp(48px, 5vw + 26px, 96px);
  --sp-xl: clamp(80px, 9vw + 48px, 168px);

  --radius: 2px;
  --nav-h: 64px;
  --maxw: 1280px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --font: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
}

[data-theme="dark"]{
  --bg: #080d18;
  --surface: #0f1729;
  --surface-2: #131c2e;
  --fg: #f4f6fb;
  --muted: #9aa3b2;
  --line: rgba(255,255,255,.12);
  --line-strong: rgba(255,255,255,.22);
  --nav-fg-top: #ffffff;
  --nav-fg: #f4f6fb;
  --nav-bg-solid: rgba(8,13,24,.8);
  --nav-border: var(--line);
  --brand-light: #ff5a5a;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  font-size: var(--fs-base);
  line-height: 1.65;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .6s var(--ease), color .6s var(--ease);
  overflow-x: hidden;
}
img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }

/* 滚动进度条(红→红亮 / 随滚动自动增长) */
.scroll-progress{
  position: fixed; top: 0; left: 0; height: 2px; width: 0; z-index: 80;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
  transition: width .12s linear;
}

.container{ max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 5vw, 56px); }
.section{ padding: var(--sp-xl) 0; }

.eyebrow{
  display: inline-block;
  font-size: var(--fs-xs);
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--brand);
  font-weight: 500;
  margin-bottom: 18px;
}
.h-hero{ font-size: var(--fs-hero); line-height: 1.0; font-weight: 200; letter-spacing: -.035em; margin: 0; }
.h-xl{ font-size: var(--fs-2xl); line-height: 1.06; font-weight: 300; letter-spacing: -.025em; margin: 0 0 18px; }
.h-lg{ font-size: var(--fs-xl); font-weight: 300; letter-spacing: -.015em; margin: 0 0 12px; }
.lead{ font-size: var(--fs-lg); color: var(--muted); max-width: 52ch; font-weight: 300; }

/* ---------- 导航:仅 logo + 三条线 ---------- */
.nav2{
  position: fixed; top: 0; left: 0; right: 0; z-index: 70;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: transparent;
  color: var(--nav-fg-top);
  border-bottom: 1px solid transparent;
  transition: background .45s var(--ease), color .45s var(--ease), border-color .45s var(--ease), backdrop-filter .45s;
}
.nav2.scrolled{
  background: var(--nav-bg-solid);
  -webkit-backdrop-filter: blur(26px) saturate(160%);
  backdrop-filter: blur(26px) saturate(160%);
  color: var(--nav-fg);
  border-bottom-color: var(--nav-border);
}
.nav2 .nav-inner{
  width: 100%; max-width: var(--maxw); margin: 0 auto;
  padding: 0 clamp(20px,5vw,56px);
  display: flex; align-items: center; gap: 24px;
}
.brand2{ display: flex; align-items: center; }
.brand2 .logo-img{ height: 34px; width: auto; display: block; transition: transform .45s var(--ease); }
.brand2:hover .logo-img{ transform: scale(1.05); }
.nav-toggle2{
  margin-left: auto; background: none; border: 0; cursor: pointer; padding: 10px; display: block;
  color: #fff;
}
.nav-toggle2 span{ display: block; width: 26px; height: 1.5px; background: #fff; margin: 6px 0; transition: transform .4s var(--ease), opacity .3s; filter: drop-shadow(0 1px 2px rgba(0,0,0,.45)); }
.nav-toggle2.open span:nth-child(1){ transform: translateY(7.5px) rotate(45deg); }
.nav-toggle2.open span:nth-child(2){ opacity: 0; }
.nav-toggle2.open span:nth-child(3){ transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- 全屏菜单: 美孚式 mega menu ---------- */
.menu-overlay{
  position: fixed; inset: 0; z-index: 65;
  background: rgba(8,13,24,.97);
  -webkit-backdrop-filter: blur(34px); backdrop-filter: blur(34px);
  display: flex; flex-direction: column;
  padding: calc(var(--nav-h) + 24px) clamp(28px, 6vw, 120px) clamp(28px, 6vw, 80px);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .5s var(--ease), visibility .5s;
  color: #fff;
}
.menu-overlay.open{ opacity: 1; visibility: visible; pointer-events: auto; }

/* 顶部 Tab 行 */
.menu-tabs{
  display: flex; gap: 4px; border-bottom: 1px solid rgba(255,255,255,.12);
  overflow-x: auto; padding-bottom: 2px; margin-bottom: clamp(24px, 4vh, 48px);
  scrollbar-width: none;
}
.menu-tabs::-webkit-scrollbar{ display: none; }
.menu-tab{
  background: transparent; border: 0; color: rgba(255,255,255,.55);
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; font-family: inherit; font-size: var(--fs-sm); font-weight: 400;
  cursor: pointer; white-space: nowrap; transition: color .3s, background .3s;
  border-radius: var(--radius);
}
.menu-tab svg{ width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
.menu-tab:hover{ color: rgba(255,255,255,.92); background: rgba(255,255,255,.04); }
.menu-tab.active{ color: var(--brand-light); background: rgba(211,47,47,.1); }

/* 内容面板 */
.menu-panels{ position: relative; flex: 1; overflow-y: auto; scrollbar-width: none; -ms-overflow-style: none; }
.menu-panels::-webkit-scrollbar{ display: none; width: 0; height: 0; }
.menu-panel{
  position: absolute; inset: 0;
  opacity: 0; visibility: hidden; transform: translateY(16px);
  transition: opacity .4s var(--ease), transform .4s var(--ease), visibility .4s;
}
.menu-panel.active{ opacity: 1; visibility: visible; transform: none; position: relative; }

.panel-grid{
  display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(24px, 4vw, 64px);
}
.panel-col h6{
  color: #fff; font-size: var(--fs-sm); font-weight: 400;
  letter-spacing: .06em; margin: 0 0 16px; padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.panel-col a{
  display: block; color: rgba(255,255,255,.65); font-size: var(--fs-base);
  font-weight: 300; padding: 7px 0; transition: color .25s, transform .25s;
}
.panel-col a:hover{ color: var(--brand-light); transform: translateX(4px); }

/* 菜单打开时的入场 stagger */
.menu-overlay.open .menu-tab{ animation: menuFadeIn .6s var(--ease) both; }
.menu-overlay.open .panel-grid{ animation: menuFadeIn .6s .1s var(--ease) both; }
@keyframes menuFadeIn{ from{ opacity: 0; transform: translateY(18px); } to{ opacity: 1; transform: none; } }

/* ---------- Hero:全屏视频 banner + 粒子 ---------- */
.hero2{
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(160deg, #0f2542 0%, #1a0e16 55%, #05070a 100%);
  padding: calc(var(--nav-h) + 40px) 0 clamp(56px, 9vh, 120px);
}
.hero-video{
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%; object-fit: cover;
  animation: heroZoom 26s ease-out forwards;
}
@keyframes heroZoom{ from{ transform: scale(1.02); } to{ transform: scale(1.14); } }
.hero-particles{
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  opacity: .5;
}
.hero-overlay{
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  background:
    linear-gradient(180deg, rgba(15,37,66,.42) 0%, rgba(211,47,47,.16) 42%, rgba(15,37,66,.62) 100%),
    linear-gradient(90deg, rgba(8,13,24,.55) 0%, transparent 55%);
}
.hero2 .container{ position: relative; z-index: 3; will-change: transform; text-align: center; }
.hero-brand{
  width: clamp(240px, 38vw, 560px); display: block; margin: 0 auto;
  filter: drop-shadow(0 10px 40px rgba(0,0,0,.35));
}
.hero-slogan{
  font-size: clamp(1.5rem, 3.6vw, 3rem); font-weight: 200; letter-spacing: .22em;
  color: #fff; margin-top: clamp(24px, 4.5vh, 56px); line-height: 1.3;
}

/* 入场 stagger(若 GSAP 未加载,内容仍可见) */
.hero-anim{ will-change: transform, opacity; }

/* ---------- 文字链接 / 按钮 ---------- */
.text-link{
  position: relative; display: inline-flex; align-items: center; gap: 8px;
  color: var(--fg); font-size: var(--fs-lg); font-weight: 300;
  padding-bottom: 4px;
}
.text-link .arw{ transition: transform .3s var(--ease); display: inline-block; }
.text-link::after{
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: currentColor; transform: scaleX(.4); transform-origin: left; transition: transform .35s var(--ease);
}
.text-link:hover::after{ transform: scaleX(1); }
.text-link:hover .arw{ transform: translateX(6px); }
.btn-line{
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 26px; border: 1px solid rgba(255,255,255,.4); border-radius: 1px;
  color: #fff; font-size: var(--fs-sm); font-weight: 300; transition: background .3s var(--ease), border-color .3s;
}
.btn-line:hover{ background: rgba(255,255,255,.1); border-color: #fff; }

/* ---------- 媒体块 ---------- */
.split2{ display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2px, .4vw, 8px); }
.media-card{
  position: relative; display: block; overflow: hidden;
  background: var(--surface-2); border: 1px solid var(--line);
  aspect-ratio: 16 / 10; color: var(--fg);
  transition: border-color .35s var(--ease);
}
.media-card .media-fill{
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(120% 120% at 80% 10%, rgba(211,47,47,.12), transparent 60%),
    linear-gradient(160deg, #131c2e, #0b1322);
  transition: transform 1s var(--ease), filter .6s var(--ease);
}
.media-card::after{
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,.3));
  opacity: 0; transition: opacity .5s var(--ease);
}
.media-card:not(.photo):hover .media-fill{ transform: scale(1.06); filter: brightness(1.16); }
.media-card.photo:hover .media-fill img{ transform: scale(1.06); filter: brightness(1.16); }
.media-card:hover::after{ opacity: 1; }
.media-card .media-body{
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: clamp(22px,3vw,40px);
  display: flex; flex-direction: column; gap: 8px;
}
.media-card.c2 .media-body{ color: var(--fg); }
.media-card.photo .media-body{ color: #fff; }
.media-card .tag{ font-size: var(--fs-xs); letter-spacing: .24em; text-transform: uppercase; color: var(--muted); }
.media-card.c2 .tag{ color: var(--brand); }
.media-card.photo .tag{ color: var(--brand-light); }
.media-card h3{ font-size: var(--fs-xl); margin: 0; font-weight: 300; letter-spacing: -.015em; }
.media-card .more{
  margin-top: 4px; font-size: var(--fs-sm); color: var(--fg); display: inline-flex; gap: 8px; align-items: center; font-weight: 300;
}
.media-card.photo .more{ color: #fff; }
/* 实拍图:等比例完整显示,不裁切,留白处深色 */
.media-card.photo .media-fill{
  display: flex; align-items: center; justify-content: center;
  background: #0b1322;
}
.media-card.photo .media-fill img{
  width: 100%; height: 100%; object-fit: contain;
  transition: transform 1s var(--ease), filter .6s var(--ease);
}
/* 实拍图暗角渐变,保证文字可读 */
.media-card.photo::before{
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg, rgba(8,13,24,.35) 0%, rgba(8,13,24,.62) 100%);
}
.media-card .more .arw{ transition: transform .3s var(--ease); }
.media-card:hover .more .arw{ transform: translateX(6px); }

/* 产品网格 */
.grid2{ display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(2px,.4vw,10px); }
.prod{
  position: relative; display: block; overflow: hidden; background: var(--surface);
  border: 1px solid var(--line); aspect-ratio: 4 / 5; color: var(--fg);
  transition: border-color .35s var(--ease);
}
.prod .fill{
  position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(165deg, var(--surface-2), #e9eaee);
  transition: transform 1s var(--ease);
}
[data-theme="dark"] .prod .fill{ background: linear-gradient(165deg, #131c2e, #0b1322); }
.prod:hover .fill{ transform: scale(1.05); }
.prod .body{ position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: clamp(20px,2vw,30px); }
.prod .cat{ font-size: var(--fs-xs); letter-spacing: .18em; text-transform: uppercase; color: var(--muted); }
.prod h3{ font-size: var(--fs-lg); margin: 8px 0 0; font-weight: 300; letter-spacing: -.015em; }
.prod .line{ margin-top: 14px; height: 1px; background: var(--line); position: relative; overflow: hidden; }
.prod .line::after{ content:""; position:absolute; left:0; top:0; bottom:0; width:32%; background: var(--brand); transform: scaleX(0); transform-origin:left; transition: transform .45s var(--ease); }
.prod:hover .line::after{ transform: scaleX(1); }

/* 行业方案:极简清单 */
.feature-row{ display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.feature{
  padding: clamp(28px,3vw,44px) clamp(20px,3vw,40px);
  border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 8px;
  transition: background .35s var(--ease);
}
.feature:nth-child(odd){ border-right: 1px solid var(--line); }
.feature:hover{ background: var(--surface-2); }
.feature .idx{ font-size: var(--fs-xs); color: var(--muted); letter-spacing: .24em; }
.feature h3{ font-size: var(--fs-xl); margin: 0; font-weight: 300; letter-spacing: -.015em; }
.feature .more{ margin-top: 2px; font-size: var(--fs-sm); display: inline-flex; gap: 8px; align-items: center; color: var(--brand); font-weight: 300; }
.feature .more .arw{ transition: transform .3s var(--ease); }
.feature:hover .more .arw{ transform: translateX(6px); }

/* ---------- 滚动淡入(IO 接管,确保一定可见,不依赖 GSAP) ---------- */
.reveal{ opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); will-change: transform, opacity; }
.reveal.in{ opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity: 1; transform: none; transition: none; }
}

/* ---------- 页脚 ---------- */
.footer2{ background: var(--bg); border-top: 1px solid var(--line); padding: var(--sp-lg) 0 var(--sp-md); }
.footer2 .grid{ display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: clamp(24px,3vw,56px); }
.footer2 h5{ font-size: var(--fs-sm); margin: 0 0 18px; letter-spacing: .04em; font-weight: 400; }
.footer2 ul{ list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.footer2 ul a{ color: var(--muted); font-size: var(--fs-sm); transition: color .25s; }
.footer2 ul a:hover{ color: var(--brand); }
.footer2 .desc{ color: var(--muted); font-size: var(--fs-sm); margin-top: 16px; max-width: 34ch; line-height: 1.7; font-weight: 300; }
.footer-bottom{ margin-top: var(--sp-md); padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: var(--muted); font-size: var(--fs-xs); letter-spacing: .02em; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px){ .grid2{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px){
  .split2{ grid-template-columns: 1fr; }
  .feature-row{ grid-template-columns: 1fr; }
  .feature:nth-child(odd){ border-right: 0; }
  .footer2 .grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1100px){ .panel-grid{ grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 860px){
  .split2{ grid-template-columns: 1fr; }
  .feature-row{ grid-template-columns: 1fr; }
  .feature:nth-child(odd){ border-right: 0; }
  .footer2 .grid{ grid-template-columns: 1fr 1fr; }
  .panel-grid{ grid-template-columns: repeat(2, 1fr); }
  .menu-overlay{ padding: calc(var(--nav-h) + 18px) clamp(20px, 5vw, 40px) clamp(24px, 5vw, 40px); }
  .menu-tab{ padding: 12px 14px; }
}
@media (max-width: 560px){
  .grid2{ grid-template-columns: 1fr; }
  .footer2 .grid{ grid-template-columns: 1fr; }
  .hero-actions{ gap: 20px; }
  .panel-grid{ grid-template-columns: 1fr; gap: 28px; }
  .menu-tabs{ margin-bottom: 22px; }
  .menu-tab span{ display: none; }
  .menu-tab{ padding: 12px; }
}

/* =========================================================
   子页共用组件(与首页 v5 同一套设计令牌)
   ========================================================= */

/* 按钮系统 */
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; font:inherit; font-weight:400; font-size:var(--fs-sm); letter-spacing:.02em; padding:13px 26px; border-radius:999px; cursor:pointer; border:1px solid transparent; transition:background .3s, color .3s, border-color .3s, transform .3s; text-decoration:none; }
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--brand); color:#fff; }
.btn-primary:hover{ background:var(--brand-light); }
.btn-accent{ background:var(--brand); color:#fff; }
.btn-ghost{ background:transparent; color:var(--fg); border-color:var(--line-strong); }
.btn-ghost:hover{ border-color:var(--brand); color:var(--brand); }
.btn-sm{ padding:9px 18px; font-size:var(--fs-xs); }
.btn-lg{ padding:16px 34px; font-size:var(--fs-base); }

/* 子页页头(深色品牌渐变,与首页同语言) */
.page-hero{
  position: relative; overflow: hidden; color: #fff;
  background: linear-gradient(160deg, #0f2542 0%, #16263f 48%, #7a1c1c 135%);
  padding: calc(var(--nav-h) + 78px) 0 clamp(58px, 8vh, 110px);
}
.page-hero .eyebrow{ color: rgba(255,255,255,.72); }
.page-hero .lead{ color: rgba(255,255,255,.84); margin-top: 20px; font-weight: 300; max-width: 62ch; }

/* 双卡(使命/承诺) */
.split-card{ display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.split-card .card{ border:1px solid var(--line); border-radius:16px; padding:clamp(26px,3vw,40px); background:var(--surface-2); transition:.35s var(--ease); }
.split-card .card:hover{ border-color:var(--brand); background:var(--surface); }
.split-card .card .tag{ font-size:var(--fs-xs); letter-spacing:.16em; text-transform:uppercase; color:var(--brand); }
.split-card .card h3{ font-size:var(--fs-xl); font-weight:300; margin:10px 0 8px; letter-spacing:-.015em; }
.split-card .card p{ color:var(--muted); font-weight:300; margin:0; }

/* 特性网格(编号卡) */
.feat-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.feat{ border:1px solid var(--line); border-radius:14px; padding:26px 22px; background:var(--surface-2); transition:.35s var(--ease); }
.feat:hover{ border-color:var(--brand); transform:translateY(-4px); background:var(--surface); }
.feat .idx{ font-size:var(--fs-xs); color:var(--brand); letter-spacing:.18em; }
.feat h3{ font-size:var(--fs-lg); font-weight:400; margin:12px 0 8px; }
.feat p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0; }

/* 步骤(顶部品牌红线 + 序号) */
.steps{ display:grid; grid-template-columns:repeat(4,1fr); gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.step{ border-top:2px solid var(--brand); padding-top:18px; }
.step .n{ font-size:var(--fs-xl); font-weight:200; color:var(--brand); line-height:1; }
.step h4{ font-size:var(--fs-lg); font-weight:400; margin:10px 0 6px; }
.step p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0; }

/* 解决方案卡(分类 + 列表) */
.sol-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.sol{ border:1px solid var(--line); border-radius:14px; padding:26px 22px; background:var(--surface-2); transition:.35s var(--ease); }
.sol:hover{ border-color:var(--brand); transform:translateY(-4px); background:var(--surface); }
.sol .cat{ font-size:var(--fs-xs); letter-spacing:.14em; text-transform:uppercase; color:var(--brand); }
.sol h3{ font-size:var(--fs-lg); font-weight:400; margin:10px 0 8px; }
.sol p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0 0 14px; }
.sol ul{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:8px; }
.sol li{ font-size:var(--fs-sm); color:var(--fg); padding-left:18px; position:relative; }
.sol li::before{ content:""; position:absolute; left:0; top:.62em; width:6px; height:6px; border-radius:50%; background:var(--brand); }

/* 招商优势卡 */
.fran-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.fran{ border:1px solid var(--line); border-radius:14px; padding:26px 22px; background:var(--surface-2); transition:.35s var(--ease); }
.fran:hover{ border-color:var(--brand); transform:translateY(-4px); background:var(--surface); }
.fran h4{ font-size:var(--fs-lg); font-weight:400; margin:0 0 8px; }
.fran p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0; }

/* 新闻卡 */
.news-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:18px; margin-top:clamp(24px,2.4vw,38px); }
.news-card{ display:flex; flex-direction:column; border:1px solid var(--line); border-radius:14px; overflow:hidden; background:var(--surface-2); transition:.35s var(--ease); }
.news-card:hover{ border-color:var(--brand); transform:translateY(-4px); background:var(--surface); }
.news-card .date{ font-size:var(--fs-xs); letter-spacing:.06em; color:var(--brand); padding:18px 22px 0; }
.news-card h3{ font-size:var(--fs-lg); font-weight:400; margin:8px 22px 8px; letter-spacing:-.01em; }
.news-card p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0 22px 22px; }

/* 联系:信息 + 表单 两栏 */
.contact-grid{ display:grid; grid-template-columns:1fr 1.1fr; gap:clamp(28px,3vw,56px); margin-top:clamp(24px,2.4vw,38px); align-items:start; }
.info-list{ display:flex; flex-direction:column; gap:18px; }
.info-item{ display:flex; gap:14px; align-items:flex-start; }
.info-item .ic{ flex:0 0 auto; width:42px; height:42px; border-radius:50%; border:1px solid var(--line-strong); display:flex; align-items:center; justify-content:center; color:var(--brand); }
.info-item h4{ font-size:var(--fs-base); font-weight:400; margin:0 0 2px; }
.info-item p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0; }
.map-placeholder{ margin-top:22px; border:1px dashed var(--line-strong); border-radius:14px; padding:48px 20px; text-align:center; color:var(--muted); font-size:var(--fs-sm); background:var(--surface-2); }

/* 表单 */
.form-card{ border:1px solid var(--line); border-radius:16px; padding:clamp(26px,3vw,40px); background:var(--surface-2); }
.form-card h3{ font-size:var(--fs-xl); font-weight:300; margin:0 0 6px; letter-spacing:-.015em; }
.form-card .sub{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:0 0 22px; }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.field{ display:flex; flex-direction:column; gap:7px; }
.field.full{ grid-column:1 / -1; }
.field label{ font-size:var(--fs-xs); letter-spacing:.04em; color:var(--muted); }
.field input, .field select, .field textarea,
.form-card input, .form-card select, .form-card textarea{
  font:inherit; font-size:var(--fs-sm); font-weight:300; color:var(--fg);
  background:var(--bg); border:1px solid var(--line-strong); border-radius:10px; padding:12px 14px; width:100%;
  transition:border-color .25s, box-shadow .25s;
}
.field textarea, .form-card textarea{ min-height:108px; resize:vertical; }
.field input:focus, .field select:focus, .field textarea:focus,
.form-card input:focus, .form-card select:focus, .form-card textarea:focus{
  outline:none; border-color:var(--brand); box-shadow:0 0 0 3px rgba(211,47,47,.12);
}
/* 键盘焦点可见性:全局焦点环(无障碍,键盘用户可看到当前焦点) */
:focus-visible{ outline:2px solid var(--brand); outline-offset:3px; border-radius:4px; }
button:focus-visible, a:focus-visible, .prod-tab:focus-visible,
.fitem:focus-visible, .card-link:focus-visible, .menu-tab:focus-visible{ outline-offset:3px; }
.form-note{ font-size:var(--fs-xs); color:var(--muted); margin-top:14px; }
.form-success{ display:none; margin-top:14px; padding:12px 16px; border-radius:10px; background:rgba(34,139,80,.1); border:1px solid rgba(34,139,80,.3); color:#1f7a48; font-size:var(--fs-sm); }

/* 通用 chip(标签) */
.chip{ display:inline-block; font-size:var(--fs-xs); border:1px solid var(--line-strong); border-radius:999px; padding:3px 11px; color:var(--muted); }

/* 选油助手 */
.selector{ display:grid; grid-template-columns:1fr 1fr; gap:clamp(24px,3vw,44px); align-items:start; margin-top:clamp(24px,2.4vw,38px); }
.selector-panel{ border:1px solid var(--line); border-radius:16px; padding:clamp(24px,3vw,36px); background:var(--surface-2); }
.opt-group{ margin-bottom:26px; }
.opt-group:last-child{ margin-bottom:0; }
.opt-group h4{ font-size:var(--fs-base); font-weight:400; margin:0 0 14px; }
.opt-row{ display:flex; flex-wrap:wrap; gap:10px; }
.opt{ border:1px solid var(--line-strong); border-radius:999px; padding:10px 18px; font-size:var(--fs-sm); font-weight:300; cursor:pointer; transition:.25s; background:var(--bg); }
.opt:hover{ border-color:var(--brand); color:var(--brand); }
.opt.sel{ background:var(--brand); border-color:var(--brand); color:#fff; }
.result-panel{ border:1px solid var(--line); border-radius:16px; padding:clamp(24px,3vw,36px); background:var(--surface-2); min-height:300px; }
.result-panel .placeholder{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); text-align:center; padding:60px 10px; }
.rec{ border:1px solid var(--line); border-radius:12px; padding:20px; background:var(--bg); margin-bottom:14px; }
.rec:last-child{ margin-bottom:0; }
.rec .top{ display:flex; justify-content:space-between; align-items:center; gap:12px; flex-wrap:wrap; }
.rec h4{ font-size:var(--fs-lg); font-weight:400; margin:0; }
.rec .badge{ font-size:var(--fs-xs); color:var(--brand); border:1px solid var(--brand); border-radius:999px; padding:3px 10px; white-space:nowrap; }
.rec p{ color:var(--muted); font-weight:300; font-size:var(--fs-sm); margin:12px 0; }
.rec .specs{ display:flex; flex-wrap:wrap; gap:6px; margin-bottom:14px; }
.rec .actions{ display:flex; gap:10px; flex-wrap:wrap; }

/* 子页组件响应式 */
@media (max-width: 860px){
  .split-card, .contact-grid, .selector{ grid-template-columns: 1fr; }
  .steps{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px){
  .form-grid{ grid-template-columns: 1fr; }
  .steps{ grid-template-columns: 1fr; }
}

/* =========================================================
   3D 旋转油桶/瓶身展示 (spin-bottle.js)
   实现：CSS 3D 分段圆柱体，把瓶身展开图拆成 N 段拼成连续圆柱
   ========================================================= */
.spin-viewer{
  position: relative;
  width: 100%;
  height: clamp(320px, 38vw, 520px);
  min-height: 280px;
  border-radius: 14px;
  overflow: hidden;
  background: transparent;
  cursor: grab;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  perspective: 1400px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.intro-box .spin-viewer{ margin-top: 28px; }
.spin-viewer:active{ cursor: grabbing; }
.spin-cylinder{
  position: relative;
  transform-style: preserve-3d;
}
.spin-seg{
  position: absolute;
  left: 50%;
  top: 50%;
  background-repeat: no-repeat;
  backface-visibility: hidden;
}
.spin-cap{
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #eef2f7, #c4ccd6 60%, #9aa6b4);
  box-shadow: 0 8px 24px rgba(0,0,0,.18);
}
.spin-cap.top{
  background: radial-gradient(circle at 35% 30%, #f4f7fb, #cdd5df 60%, #aab4c2);
}
.spin-viewer.spin-error{
  background: transparent;
  cursor: default;
}
.spin-viewer.spin-error .spin-cylinder{ display: none; }
.spin-viewer + noscript img,
.spin-viewer.spin-error + noscript img{ display: block; }
.spin-viewer::after{
  content: '拖拽旋转';
  position: absolute;
  bottom: 12px;
  right: 14px;
  font-size: var(--fs-xs);
  color: var(--muted);
  background: rgba(255,255,255,.72);
  padding: 4px 10px;
  border-radius: 999px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s;
}
.spin-viewer.spin-loaded::after{ opacity: 1; }
[data-theme="dark"] .spin-viewer::after{ background: rgba(15,23,41,.72); color: rgba(255,255,255,.72); }
@media (max-width: 640px){
  .spin-viewer{ height: clamp(280px, 58vw, 380px); }
}

/* ===== 新闻详情页 ===== */
.article-body{ max-width: 760px; margin: 0 auto; }
.article-body p{ font-size: var(--fs-md); line-height: 1.9; color: var(--text); margin: 0 0 1.15em; }
.article-body .article-sub{ font-size: var(--fs-lg); font-weight: 600; color: var(--navy); margin: 1.8em 0 .6em; padding-left: 14px; border-left: 3px solid var(--brand); }
[data-theme="dark"] .article-body .article-sub{ color: #fff; }
.article-back{ max-width: 760px; margin: 36px auto 0; }
.article-back .btn-line{ display: inline-flex; align-items: center; gap: 6px; }
@media (max-width: 640px){
  .article-body p{ font-size: var(--fs-sm); }
  .article-body .article-sub{ font-size: var(--fs-md); }
}

/* 新闻配图：导入老站图片，本地化嵌入 */
.article-figure{ margin: 1.6em 0; }
.article-figure img{ width: 100%; height: auto; border-radius: 12px; display: block; border: 1px solid var(--line); }
.article-figure figcaption{ margin-top: 8px; font-size: var(--fs-xs); color: var(--muted); text-align: center; }
.news-lead{ margin: 0 0 1.8em; }
.news-lead img{ width: 100%; height: auto; border-radius: 14px; display: block; border: 1px solid var(--line); }
.news-gallery{ display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 2em 0 0; }
.news-gallery figure{ margin: 0; }
.news-gallery img{ width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; border-radius: 10px; border: 1px solid var(--line); display: block; }
@media (max-width: 560px){
  .news-gallery{ grid-template-columns: 1fr; }
}