/* ==========================================================================
   卓傲照明官网 - 全局样式
   设计原则：移动优先、响应式、无障碍、语义化
   ========================================================================== */

/* ---------- CSS 变量：统一设计令牌 ---------- */
:root {
  --c-primary: #0a4d8c;
  --c-primary-dark: #073760;
  --c-accent: #f5a623;
  --c-text: #1f2937;
  --c-text-light: #6b7280;
  --c-border: #e5e7eb;
  --c-bg: #ffffff;
  --c-bg-alt: #f7f9fc;

  --spacing: 1rem;
  --radius: 8px;
  --radius-lg: 16px;
  --shadow: 0 2px 12px rgba(10, 77, 140, .08);
  --shadow-lg: 0 8px 32px rgba(10, 77, 140, .14);

  --container: 1200px;
  --header-h: 72px;

  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-decoration: none; transition: color .25s var(--ease); }
a:hover { color: var(--c-primary-dark); }
ul, ol { padding-left: 1.2em; }

/* 无障碍：仅键盘导航时显示焦点环 */
:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 3px;
}
/* 鼠标点击不显示焦点环 */
:focus:not(:focus-visible) { outline: none; }

/* 跳转到主内容（屏幕阅读器与键盘用户） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: .75rem 1.25rem;
  background: var(--c-primary);
  color: #fff;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; color: #fff; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.section--alt { background: var(--c-bg-alt); }

/* ---------- 区块标题 ---------- */
.sec-head { text-align: center; margin-bottom: clamp(2rem, 4vw, 3rem); }
.sec-head__title {
  font-size: clamp(1.6rem, 3.5vw, 2.35rem);
  font-weight: 700;
  margin: 0 0 .6rem;
  letter-spacing: -.01em;
}
.sec-head__title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--c-accent);
  border-radius: 2px;
  margin: 1rem auto 0;
}
.sec-head__sub {
  color: var(--c-text-light);
  margin: 1rem 0 0;
  font-size: 1.02rem;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 1.9rem;
  border: 2px solid var(--c-primary);
  border-radius: var(--radius);
  background: var(--c-primary);
  color: #fff !important;
  font-size: .98rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s var(--ease);
  text-align: center;
}
.btn:hover {
  background: var(--c-primary-dark);
  border-color: var(--c-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn--ghost { background: transparent; color: var(--c-primary) !important; }
.btn--ghost:hover { background: var(--c-primary); color: #fff !important; }
.btn--light { background: #fff; border-color: #fff; color: var(--c-primary) !important; }
.btn--light:hover { background: transparent; color: #fff !important; }
.btn--block { display: flex; width: 100%; }

/* ==========================================================================
   页头
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow .3s var(--ease);
}
.header.is-stuck { box-shadow: var(--shadow); }
.header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo { display: flex; align-items: center; gap: .65rem; flex-shrink: 0; }
.logo__img { max-height: 44px; width: auto; }
.logo__text { font-size: 1.15rem; font-weight: 700; color: var(--c-text); white-space: nowrap; }

/* 导航 */
.nav { display: flex; align-items: center; gap: clamp(.4rem, 1.5vw, 1.4rem); }
.nav__link {
  position: relative;
  padding: .5rem .35rem;
  color: var(--c-text) !important;
  font-weight: 500;
  font-size: .97rem;
  white-space: nowrap;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: .35rem; right: .35rem; bottom: .2rem;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__link[aria-current="page"] { color: var(--c-primary) !important; }

.nav__lang {
  padding: .4rem .95rem;
  border: 1.5px solid var(--c-primary);
  border-radius: 999px;
  color: var(--c-primary) !important;
  font-size: .85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: all .25s var(--ease);
}
.nav__lang:hover { background: var(--c-primary); color: #fff !important; }

/* 移动端汉堡按钮 */
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  padding: 0;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  background: #fff;
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 20px; height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: transform .28s var(--ease), opacity .2s var(--ease);
}
.nav-toggle::before { top: 13px; }
.nav-toggle span { top: 20px; }
.nav-toggle::after { top: 27px; }
.nav-toggle[aria-expanded="true"]::before { transform: translateX(-50%) rotate(45deg); top: 20px; }
.nav-toggle[aria-expanded="true"] span { opacity: 0; }
.nav-toggle[aria-expanded="true"]::after { transform: translateX(-50%) rotate(-45deg); top: 20px; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .5rem 1.25rem 1.25rem;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-lg);
    /* 用 hidden 属性控制显隐，避免动画遮挡点击 */
  }
  .nav[hidden] { display: none; }
  .nav__link { padding: .9rem .25rem; border-bottom: 1px solid var(--c-border); }
  .nav__link::after { display: none; }
  .nav__lang { margin-top: 1rem; text-align: center; display: block; }
  .header__inner { position: relative; }
}

/* ==========================================================================
   首页 · 幻灯片
   ========================================================================== */
.hero {
  position: relative;
  background: var(--c-primary-dark);
  overflow: hidden;
  /* 移动端动态视口高度，避免地址栏导致跳动 */
  min-height: clamp(460px, 62dvh, 640px);
  display: flex;
  align-items: center;
}
.hero__slides { position: absolute; inset: 0; }
.hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s var(--ease);
}
.hero__slide.is-active { opacity: 1; }
.hero__slide img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(7, 55, 96, .92) 0%, rgba(7, 55, 96, .72) 50%, rgba(7, 55, 96, .35) 100%);
}
.hero__inner {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 680px;
}
.hero__title {
  font-size: clamp(1.75rem, 5vw, 3.1rem);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 1.15rem;
  color: #fff;
}
.hero__text {
  font-size: clamp(.98rem, 1.8vw, 1.18rem);
  color: rgba(255, 255, 255, .9);
  margin: 0 0 2rem;
  max-width: 540px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }

/* 幻灯片指示器 */
.hero__dots {
  position: absolute;
  bottom: 1.75rem; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: .6rem;
  z-index: 3;
}
.hero__dot {
  width: 30px; height: 4px;
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: rgba(255, 255, 255, .45);
  cursor: pointer;
  transition: background .3s var(--ease);
}
.hero__dot.is-active { background: var(--c-accent); }

/* ==========================================================================
   关于区块
   ========================================================================== */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.about__text p { color: var(--c-text-light); margin: 0 0 1.15rem; }
.about__vision {
  border-left: 4px solid var(--c-accent);
  padding: .25rem 0 .25rem 1.25rem;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--c-text) !important;
  margin-bottom: 1.75rem !important;
}
.about__media img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}
@media (max-width: 820px) { .about { grid-template-columns: 1fr; } }

/* 数据统计 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--c-border);
}
.stat { text-align: center; }
.stat__num {
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1.15;
  display: block;
}
.stat__label {
  font-size: .9rem;
  color: var(--c-text-light);
  margin-top: .35rem;
  display: block;
}
@media (max-width: 640px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* ==========================================================================
   产品 / 新闻卡片
   ========================================================================== */
.grid {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 1.85rem);
}
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 980px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid--4, .grid--3 { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--c-bg-alt);
  overflow: hidden;
}
.card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.card:hover .card__media img { transform: scale(1.07); }
.card__tag {
  position: absolute;
  top: .75rem; left: .75rem;
  padding: .3rem .75rem;
  background: rgba(10, 77, 140, .92);
  color: #fff;
  border-radius: 999px;
  font-size: .76rem;
  font-weight: 600;
}
.card__body { padding: 1.15rem 1.25rem 1.4rem; flex: 1; display: flex; flex-direction: column; }
.card__title {
  font-size: 1.06rem;
  font-weight: 600;
  margin: 0 0 .5rem;
  line-height: 1.45;
}
.card__title a { color: var(--c-text); }
.card:hover .card__title a { color: var(--c-primary); }
.card__desc {
  font-size: .91rem;
  color: var(--c-text-light);
  margin: 0 0 1rem;
  /* 限制两行 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card__foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .84rem;
  color: var(--c-text-light);
  padding-top: .75rem;
  border-top: 1px solid var(--c-border);
}
.card__more { font-weight: 600; color: var(--c-primary); }

/* ---------- 优势 ---------- */
.adv {
  background: var(--c-bg-alt);
  padding: clamp(1.75rem, 3vw, 2.25rem);
  border-radius: var(--radius-lg);
  border-top: 4px solid var(--c-primary);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.adv:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.adv__icon {
  width: 52px; height: 52px;
  display: grid;
  place-items: center;
  background: var(--c-primary);
  color: #fff;
  border-radius: 12px;
  font-size: 1.5rem;
  margin-bottom: 1.1rem;
}
.adv__title { font-size: 1.1rem; font-weight: 600; margin: 0 0 .55rem; }
.adv__desc { font-size: .92rem; color: var(--c-text-light); margin: 0; }

/* ==========================================================================
   内页
   ========================================================================== */
.page-head {
  background: linear-gradient(120deg, var(--c-primary-dark), var(--c-primary));
  color: #fff;
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  text-align: center;
}
.page-head h1 { margin: 0; font-size: clamp(1.6rem, 4vw, 2.5rem); color: #fff; }
.page-head p { margin: .8rem 0 0; color: rgba(255,255,255,.85); }

.breadcrumb {
  font-size: .88rem;
  color: var(--c-text-light);
  margin-bottom: 1.5rem;
}
.breadcrumb a { color: var(--c-text-light); }
.breadcrumb span { margin: 0 .5rem; }

/* ---------- 文章正文 ---------- */
.article { max-width: 820px; margin: 0 auto; }
.article__meta {
  display: flex; flex-wrap: wrap; gap: 1.25rem;
  padding-bottom: 1.15rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--c-border);
  font-size: .88rem;
  color: var(--c-text-light);
}
.article__body { font-size: 1.03rem; line-height: 1.95; }
.article__body img { border-radius: var(--radius); margin: 1.5rem 0; }
.article__body h2 { font-size: 1.4rem; margin: 2rem 0 1rem; }
.article__body h3 { font-size: 1.18rem; margin: 1.6rem 0 .8rem; }
.article__body p { margin: 0 0 1.2rem; }
.article__nav {
  display: flex; justify-content: space-between; gap: 1rem;
  margin-top: 2.5rem; padding-top: 1.5rem;
  border-top: 1px solid var(--c-border);
  font-size: .93rem;
}

/* ---------- 分页 ---------- */
.pager {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
}
.pager a, .pager span {
  min-width: 42px;
  padding: .6rem .85rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  text-align: center;
  color: var(--c-text) !important;
  font-size: .93rem;
  background: #fff;
}
.pager a:hover { border-color: var(--c-primary); color: var(--c-primary) !important; }
.pager .is-current {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #fff !important;
  font-weight: 600;
}
.pager .is-disabled { opacity: .45; }

/* ==========================================================================
   联系页
   ========================================================================== */
.contact {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}
@media (max-width: 900px) { .contact { grid-template-columns: 1fr; } }

.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li {
  display: flex;
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--c-border);
}
.info-list li:last-child { border-bottom: 0; }
.info-list__icon {
  flex-shrink: 0;
  width: 42px; height: 42px;
  display: grid; place-items: center;
  background: rgba(10, 77, 140, .1);
  color: var(--c-primary);
  border-radius: 10px;
  font-size: 1.15rem;
}
.info-list__label { font-size: .85rem; color: var(--c-text-light); display: block; }
.info-list__value { font-weight: 500; word-break: break-word; }

/* ---------- 表单 ---------- */
.form-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  box-shadow: var(--shadow);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }

.field { margin-bottom: 1.15rem; }
.field label {
  display: block;
  font-size: .9rem;
  font-weight: 500;
  margin-bottom: .45rem;
}
.field label .req { color: #dc2626; margin-left: .15rem; }
.field input, .field textarea, .field select {
  width: 100%;
  padding: .8rem 1rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius);
  font-size: .97rem;
  font-family: inherit;
  background: #fff;
  color: var(--c-text);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(10, 77, 140, .12);
}
.field textarea { min-height: 130px; resize: vertical; }
.field .hint { font-size: .82rem; color: var(--c-text-light); margin-top: .35rem; }

/* 表单提示 */
.alert {
  padding: .9rem 1.15rem;
  border-radius: var(--radius);
  margin-bottom: 1.35rem;
  font-size: .93rem;
  border-left: 4px solid;
}
.alert--ok { background: #ecfdf5; border-color: #10b981; color: #065f46; }
.alert--err { background: #fef2f2; border-color: #ef4444; color: #991b1b; }

/* ==========================================================================
   页脚
   ========================================================================== */
.footer {
  background: #0d1b2a;
  color: rgba(255, 255, 255, .68);
  padding: clamp(2.5rem, 5vw, 4rem) 0 0;
  font-size: .93rem;
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.3fr;
  gap: clamp(1.75rem, 3vw, 3rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}
@media (max-width: 780px) { .footer__grid { grid-template-columns: 1fr; } }

.footer__logo { display: flex; align-items: center; gap: .65rem; margin-bottom: 1.1rem; }
.footer__logo img { max-height: 40px; filter: brightness(0) invert(1); }
.footer__logo span { color: #fff; font-weight: 700; font-size: 1.08rem; }
.footer__desc { margin: 0 0 1.25rem; line-height: 1.85; }

.footer__title {
  color: #fff;
  font-size: 1.02rem;
  font-weight: 600;
  margin: 0 0 1.15rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid rgba(255, 255, 255, .14);
}
.footer__links { list-style: none; padding: 0; margin: 0; }
.footer__links li { margin-bottom: .6rem; }
.footer__links a { color: rgba(255, 255, 255, .68) !important; }
.footer__links a:hover { color: var(--c-accent) !important; padding-left: 4px; }
.footer__contact li { margin-bottom: .75rem; display: flex; gap: .6rem; align-items: flex-start; }

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 1.4rem 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .6rem;
  font-size: .86rem;
}
.footer__bottom a { color: rgba(255, 255, 255, .68) !important; }
.footer__bottom a:hover { color: var(--c-accent) !important; }

/* ==========================================================================
   返回顶部 & 动效
   ========================================================================== */
.to-top {
  position: fixed;
  right: 1.25rem; bottom: 1.25rem;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  background: var(--c-primary);
  color: #fff !important;
  border: 0;
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .3s var(--ease);
  z-index: 90;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--c-primary-dark); }

/* 滚动进场动画 */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

/* 尊重用户的减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式图片占位 ---------- */
.img-fallback {
  width: 100%; height: 100%;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #e8eef5, #d5e0ec);
  color: #94a3b8;
  font-size: 2rem;
}

/* ---------- 打印 ---------- */
@media print {
  .header, .footer, .to-top, .nav-toggle, .hero__dots { display: none !important; }
  body { font-size: 12pt; }
  .section { padding: 1rem 0; }
}