/* =========================================================
   AYD · 辽宁奥亿达新材料 · 全站共享样式
   设计语言：工业、精密、克制 (AMAT / TEL inspired)
   ========================================================= */

:root {
  /* ==== 核心色 ==== */
  --ink: #0A0E1A;
  --ink-80: rgba(10,14,26,0.8);
  --ink-60: rgba(10,14,26,0.58);
  --ink-40: rgba(10,14,26,0.38);
  --ink-20: rgba(10,14,26,0.15);
  --ink-10: rgba(10,14,26,0.08);

  --paper: #FFFFFF;
  --surface: #F5F5F2;
  --surface-dark: #EDEDEA;
  --hero-bg: #E5E5E4;

  --brand: #CE0405;
  --brand-dark: #A40304;
  --brand-light: #FFF2F2;

  --line: #E1E1DD;
  --line-soft: #EDEDEA;

  /* ==== Typography ==== */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --font-serif-en: "Fraunces", "Times New Roman", serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;

  /* ==== 节奏 ==== */
  --max-w: 1280px;
  --pad-x: clamp(24px, 5vw, 80px);
  --nav-h: 72px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  font-size: 15px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

/* ========== 原子 ========== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.eyebrow {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brand);
  font-weight: 500;
  display: inline-block;
}

.eyebrow-neutral {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-60);
  font-weight: 500;
}

.serif-en {
  font-family: var(--font-serif-en);
  font-weight: 400;
  font-style: italic;
}

.divider {
  height: 1px;
  background: var(--line);
  border: none;
}

/* ========== 导航 ========== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(229, 229, 228, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  height: 100%;
}
.nav-logo img {
  height: 36px;
  width: auto;
  display: block;
}

/* 导航菜单 */
.nav-links {
  display: flex;
  gap: 44px;
  list-style: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 auto;
  height: 100%;
  align-items: center;
}
.nav-links > li {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}
.nav-links a {
  position: relative;
  color: var(--ink-60);
  padding: 4px 0;
  transition: color 0.2s;
  display: inline-block;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  bottom: -26px;
  height: 2px;
  background: var(--brand);
}

/* ========== 导航下拉菜单 ========== */
.nav-submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: rgba(229, 229, 228, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border: 1px solid transparent;
  padding: 20px 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s, visibility 0.2s, transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}
.nav-links > li:hover .nav-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}
.nav-submenu li {
  display: block;
  padding: 0;
}
.nav-submenu a {
  display: block;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--ink);
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}
.nav-submenu a:hover {
  color: var(--brand);
  background: rgba(206, 4, 5, 0.04);
}
.nav-submenu a::after { display: none; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

/* 语言切换器 */
.nav-lang {
  display: flex;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--ink-40);
  font-weight: 500;
  text-transform: uppercase;
}
.nav-lang .active { color: var(--ink); }
.nav-lang a:hover { color: var(--ink); }

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  transition: 0.3s;
}

/* 菜单展开时锁住背景滚动（配合 main.js 的 nav-open-lock） */
body.nav-open-lock {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

@media (max-width: 1020px) {
  .nav-links { display: none; }
  .nav-submenu { display: none; }
  .nav-toggle { display: block; }

  /* 展开的移动菜单：不透明背景 + 高层级，盖住下面的 hero/内容 */
  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: #FFFFFF;          /* 实心白，不透明，不再透出后面的图 */
    padding: 20px var(--pad-x) 28px;
    gap: 4px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 32px rgba(10,14,26,0.12);
    margin: 0;
    height: auto;
    max-height: calc(100vh - var(--nav-h));  /* 菜单太长时内部可滚动 */
    overflow-y: auto;
    z-index: 60;                 /* 高于 hero，盖在最上层 */
    text-transform: uppercase;
  }
  /* 移动菜单每项做成整行、点击区域更大 */
  .nav.open .nav-links > li {
    height: auto;
    width: 100%;
    display: block;
  }
  .nav.open .nav-links > li > a {
    display: block;
    width: 100%;
    padding: 14px 0;
    color: var(--ink);
    border-bottom: 1px solid var(--line-soft);
  }
  /* 移动端去掉桌面那个 active 下划线绝对定位，避免错位 */
  .nav.open .nav-links a.active::after { display: none; }
  /* 移动菜单里子菜单直接平铺展示 */
  .nav.open .nav-links .nav-submenu {
    display: block;
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: none;
    padding: 4px 0 8px 16px;
    min-width: 0;
  }
  .nav.open .nav-links .nav-submenu a {
    padding: 8px 0;
    font-size: 14px;
    color: var(--ink-60);
  }
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 24px 0 0;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-40);
  font-weight: 500;
}
.breadcrumb a {
  color: var(--ink-40);
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: var(--ink);
}
.breadcrumb .sep {
  color: var(--ink-20);
  font-weight: 300;
}
.breadcrumb .current {
  color: var(--ink);
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 32px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.25s;
  font-family: var(--font-sans);
  letter-spacing: 0.02em;
}
.btn:hover {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:hover {
  background: var(--brand);
  border-color: var(--brand);
}
.btn-red {
  background: var(--brand);
  color: var(--paper);
  border-color: var(--brand);
}
.btn-red:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
}
.btn .arrow {
  display: inline-block;
  transition: transform 0.25s;
}
.btn:hover .arrow { transform: translateX(4px); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  padding-bottom: 3px;
  border-bottom: 1px solid var(--ink);
  letter-spacing: 0.02em;
  transition: all 0.25s;
}
.link-arrow:hover {
  gap: 14px;
  color: var(--brand);
  border-color: var(--brand);
}

/* ========== 通用模块 ========== */
.section {
  padding: 120px 0;
  position: relative;
}
.section-dark {
  background: var(--ink);
  color: var(--paper);
}
.section-surface {
  background: var(--surface);
}

.section-head {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 80px;
  margin-bottom: 72px;
  align-items: end;
}
.section-head h2 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.section-head h2 .serif-en {
  color: var(--brand);
  letter-spacing: -0.01em;
}
.section-head .desc {
  font-size: 16px;
  color: var(--ink-60);
  line-height: 1.75;
  max-width: 560px;
}

@media (max-width: 860px) {
  .section { padding: 80px 0; }
  .section-head { grid-template-columns: 1fr; gap: 24px; margin-bottom: 48px; }
}

/* ========== 通用页面头 ========== */
.page-header {
  padding: 40px 0 80px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.page-header .eyebrow { margin-bottom: 24px; display: block; margin-top: 48px; }
.page-header h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 500;
  line-height: 1.08;
  max-width: 1000px;
  letter-spacing: -0.025em;
}
.page-header .subtitle {
  margin-top: 32px;
  font-size: 17px;
  color: var(--ink-60);
  max-width: 640px;
  line-height: 1.7;
}

/* =========================================================
   AYD · Footer 升级样式
   ========================================================= */

/* Footer 主容器 */
.footer {
  background: var(--ink);
  color: var(--paper);
  padding: 80px 0 32px;
}

.footer .container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* ========== Footer 顶部网格 · 加大间距 ========== */
.footer-top {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* ========== 品牌列 ========== */
.footer-brand {
  display: flex;
  flex-direction: column;
}

/* Logo 尺寸 · 和右侧内容视觉权重平衡 */
.footer-brand img {
  height: 32px !important;
  width: auto !important;
  margin-bottom: 0 !important;
  align-self: flex-start;
}

/* 隐藏原有描述段 */
.footer-brand p {
  display: none;
}

/* EST 标签 */
.footer-stamp {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 16px;
  margin-top: 20px;
  border-top: 0.5px solid rgba(255, 255, 255, 0.15);
  max-width: 200px;
}
.footer-stamp-line {
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  font-weight: 500;
}
.footer-stamp-sub {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ========== 导航列 ========== */
.footer-col h4 {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin: 0 0 20px;
  font-weight: 500;
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col ul li {
  margin-bottom: 12px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
}
.footer-col ul li a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-col ul li a:hover {
  color: var(--brand);
}

/* ========== 底部栏 ========== */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 32px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}
.footer-legal {
  display: flex;
  gap: 24px;
}
.footer-legal a {
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-legal a:hover {
  color: var(--brand);
}

/* ========== 响应式 ========== */
@media (max-width: 1020px) {
  .footer-top {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 40px;
  }
  .footer-brand {
    grid-column: 1 / -1;
    margin-bottom: 16px;
  }
}

@media (max-width: 640px) {
  .footer {
    padding: 56px 0 24px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding-bottom: 40px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
}
/* ========== 大标题 · 居中 + 行内注解 ========== */
.page-header h1.page-title-centered {
  text-align: left;
  font-size: clamp(44px, 6vw, 80px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 24px 0 0;
  max-width: 1200px;
}

/* 行内注解（跟在"。"后） */
.page-header h1.page-title-centered .title-annotation {
  font-size: 15px;
  font-weight: 400;
  color: var(--ink-60);
  line-height: 1.6;
  letter-spacing: 0;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  margin-left: 16px;
  display: inline;
  vertical-align: baseline;
}

/* 原 subtitle 隐藏 */
.page-header .subtitle {
  display: none;
}

/* 响应式：小屏注解换行到下面 */
@media (max-width: 860px) {
  .page-header h1.page-title-centered {
    font-size: clamp(32px, 7vw, 48px);
  }
  .page-header h1.page-title-centered .title-annotation {
    display: block;
    margin: 20px auto 0;
    max-width: 600px;
    font-size: 13px;
  }
}
/* 英文版专用：注释独立成块 */
.page-header h1.page-title-en .title-annotation {
  display: block;
  margin-top: 20px;
  margin-left: 0;
  max-width: 720px;
}

/* 小屏英文版 */
@media (max-width: 860px) {
  .page-header h1.page-title-en .title-annotation {
    font-size: 13px;
    max-width: 100%;
  }
}

/* ========== Footer LinkedIn 社交图标 ========== */
.footer-social {
  margin-top: 16px;
  display: flex;
  gap: 14px;
}
.footer-social a {
  color: rgba(255, 255, 255, 0.55);
  display: inline-flex;
  transition: color 0.2s;
}
.footer-social a:hover {
  color: var(--brand);
}