/* ===== PPG 授权经销商站 · 精修版样式 =====
   主蓝 #0078aa / 强调红 #ed2d38 / 深蓝 #002e75 */
:root {
  --blue: #0078aa;
  --blue-dark: #00688f;
  --blue-deep: #002e75;
  --red: #ed2d38;
  --red-dark: #d0202b;
  --ink: #2b2f36;
  --gray: #666;
  --line: #e8ecf0;
  --shadow-sm: 0 2px 10px rgba(15, 40, 70, .08);
  --shadow-md: 0 10px 30px rgba(15, 40, 70, .14);
  --shadow-lg: 0 16px 44px rgba(0, 60, 100, .18);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font: 14px/1.75 "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif; color: var(--ink); background: #fff; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: #333; transition: color .25s; }
ul, li { list-style: none; }
img { max-width: 100%; }
.clear { clear: both; }
.main { width: 1200px; max-width: 96%; margin: 0 auto; }
.Left { float: left; }
.Right, .f_r { float: right; }
::selection { background: var(--blue); color: #fff; }

/* ===== 顶部条 ===== */
.header_top { background: linear-gradient(90deg, #f7f9fb, #eef3f7); border-bottom: 1px solid var(--line); font-size: 12px; position: relative; }
.header_top .main { line-height: 36px; }
.header_top_title { color: #8a94a0; }
.header_top_right { float: right; }
.header_top_right a { color: #6b7683; margin-left: 20px; position: relative; }
.header_top_right a:hover { color: var(--blue); }
@keyframes popIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ===== Logo 行 ===== */
.logo_bar { padding: 26px 0 22px; }
.logo_bar .main { display: flex; align-items: center; }
.logo_img { display: flex; align-items: center; flex-shrink: 0; }
.logo_mark { width: 62px; height: 62px; background: linear-gradient(135deg, var(--blue), var(--blue-deep)); color: #fff; font-size: 25px; font-weight: bold; display: flex; align-items: center; justify-content: center; letter-spacing: 1px; border-radius: 12px; box-shadow: 0 6px 16px rgba(0, 120, 170, .35); }
.logo_text { margin-left: 14px; font-size: 25px; font-weight: bold; color: var(--blue-deep); line-height: 1.25; letter-spacing: 1px; }
.logo_text em { display: block; font-style: normal; font-size: 12px; font-weight: normal; color: #98a3ae; letter-spacing: 4px; }
.search { flex: 1; display: flex; flex-direction: column; align-items: center; }
.search-wrap { display: flex; border: 2px solid var(--blue); border-radius: 8px; overflow: hidden; width: 430px; box-shadow: var(--shadow-sm); }
.search-wrap input { flex: 1; border: 0; outline: 0; padding: 0 14px; height: 40px; font-size: 13px; background: #fff; }
.search-btn { width: 86px; border: 0; background: linear-gradient(135deg, var(--blue), var(--blue-dark)); color: #fff; font-size: 15px; cursor: pointer; transition: filter .2s; }
.search-btn:hover { filter: brightness(1.08); }
.search_hot { margin-top: 7px; font-size: 12px; color: #9aa4b0; }
.search_hot a { color: #9aa4b0; margin-right: 10px; }
.search_hot a:hover { color: var(--red); }
.logo_tel { text-align: right; margin-top: 3px; flex-shrink: 0; }
.logo_tel strong { display: block; font-size: 30px; color: var(--red); font-family: "Segoe UI", Arial, sans-serif; font-weight: 700; letter-spacing: .5px; line-height: 1.2; }
.logo_tel span { font-size: 12px; color: #9aa4b0; }

/* ===== 导航（吸顶） ===== */
.nav { background: linear-gradient(90deg, var(--blue), var(--blue-dark)); position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 12px rgba(0, 60, 100, .25); }
.nav ul { display: flex; }
.nav li a { display: block; padding: 0 30px; line-height: 50px; color: #fff; font-size: 16px; letter-spacing: 1px; position: relative; }
.nav li a::after { content: ""; position: absolute; left: 50%; bottom: 8px; width: 0; height: 3px; background: var(--red); border-radius: 2px; transition: all .25s; transform: translateX(-50%); }
.nav li.cur a::after, .nav li a:hover::after { width: 32px; }
.nav li.cur a, .nav li a:hover { background: rgba(255, 255, 255, .08); color: #fff; }

/* ===== 焦点区 ===== */
.jiaodian { padding: 18px 0; background: linear-gradient(180deg, #f4f8fa, #eef4f8); }
.jiaodian_main { display: flex; align-items: stretch; }
.menu-box { width: 260px; background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); }
.menu-box-title { background: linear-gradient(135deg, var(--blue-deep), #0a3d8f); color: #fff; font-size: 16px; text-align: center; line-height: 46px; letter-spacing: 3px; }
.menu-item a { display: block; padding: 11px 18px; border-bottom: 1px dashed var(--line); transition: background .2s, padding-left .2s; }
.menu-item b { display: block; font-size: 15px; color: #333; }
.menu-item i { display: block; font-style: normal; font-size: 12px; color: #9aa4b0; }
.menu-item a:hover { background: #f2f9fc; padding-left: 24px; }
.menu-item a:hover b { color: var(--blue); }
.biaodan { padding: 14px 16px 18px; background: linear-gradient(180deg, #fafcfd, #f3f7fa); }
.biaodan-title { font-size: 14px; font-weight: bold; color: var(--red); margin-bottom: 10px; }
.biaodan-input { width: 100%; height: 36px; border: 1px solid #dde4ea; border-radius: 6px; margin-bottom: 9px; padding: 0 12px; font-size: 13px; outline: none; transition: border-color .2s, box-shadow .2s; background: #fff; }
.biaodan-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0, 120, 170, .12); }
.biaodan-submit { width: 100%; height: 38px; border: 0; border-radius: 6px; background: linear-gradient(135deg, var(--red), var(--red-dark)); color: #fff; font-size: 15px; letter-spacing: 2px; cursor: pointer; transition: transform .15s, filter .2s; }
.biaodan-submit:hover { filter: brightness(1.08); transform: translateY(-1px); }
.biaodan-tip { font-size: 12px; color: #1a9c46; min-height: 18px; margin-top: 7px; }

.index_focus { flex: 1; min-width: 0; position: relative; overflow: hidden; height: auto; border-radius: 12px; box-shadow: var(--shadow-md); }
.index_focus .bd { position: relative; height: 100%; min-height: 430px; }
.slide { position: absolute; inset: 0; opacity: 0; transition: opacity .7s ease; display: flex; align-items: center; }
.slide.active { opacity: 1; }
.slide1 { background: linear-gradient(115deg, #00204d 0%, var(--blue-deep) 35%, var(--blue) 75%, #12a4c9 100%); }
.slide2 { background: linear-gradient(115deg, #00364d 0%, #00688f 55%, #4da9df 100%); }
.slide3 { background: linear-gradient(115deg, #0a1f33 0%, #0a4d68 50%, var(--blue) 100%); }
.slide::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(115deg, rgba(255,255,255,.045) 0 2px, transparent 2px 90px); }
.slide::after { content: ""; position: absolute; right: -80px; top: -80px; width: 340px; height: 340px; border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.14), transparent 65%); }
.slide-inner { padding: 0 72px; color: #fff; position: relative; z-index: 2; }
.slide-inner h2 { font-size: 44px; letter-spacing: 3px; margin-bottom: 16px; text-shadow: 0 3px 14px rgba(0,0,0,.3); }
.slide-inner p { font-size: 16px; opacity: .92; margin-bottom: 30px; letter-spacing: 1px; }
.slide-btn { display: inline-block; padding: 11px 38px; background: linear-gradient(135deg, var(--red), var(--red-dark)); color: #fff; font-size: 15px; letter-spacing: 2px; border-radius: 30px; box-shadow: 0 8px 20px rgba(237, 45, 56, .4); transition: transform .2s, box-shadow .2s; }
.slide-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(237, 45, 56, .5); color: #fff; }
.index_focus_pre, .index_focus_next { position: absolute; top: 50%; transform: translateY(-50%); width: 46px; height: 62px; line-height: 62px; text-align: center; color: rgba(255,255,255,.75); font-size: 22px; background: rgba(0,0,0,.18); cursor: pointer; z-index: 5; transition: background .2s, opacity .25s; opacity: 0; }
.index_focus:hover .index_focus_pre, .index_focus:hover .index_focus_next { opacity: 1; }
.index_focus_pre { left: 0; border-radius: 12px 0 0 12px; }
.index_focus_next { right: 0; border-radius: 0 12px 12px 0; }
.index_focus_pre:hover, .index_focus_next:hover { background: rgba(0,0,0,.38); color: #fff; }
.slide_nav { position: absolute; bottom: 16px; left: 0; right: 0; text-align: center; z-index: 5; }
.index_focus::after { content: "PPG"; position: absolute; right: 26px; bottom: -6px; font-size: 110px; font-weight: bold; font-family: "Segoe UI", Arial; color: rgba(255,255,255,.07); letter-spacing: 4px; z-index: 1; pointer-events: none; }
.slide_nav span { display: inline-block; width: 30px; height: 4px; background: rgba(255,255,255,.4); margin: 0 5px; cursor: pointer; border-radius: 2px; transition: background .2s, width .2s; }
.slide_nav span.on { background: var(--red); width: 40px; }

/* ===== 四大优势 ===== */
.our_advan { padding: 38px 0; background: #fff; }
.advan_list1 { display: flex; }
.advan_list1 .cell { flex: 1; text-align: center; padding: 22px 12px; border-right: 1px solid var(--line); transition: transform .25s; }
.advan_list1 .cell:last-child { border-right: 0; }
.advan_list1 .cell:hover { transform: translateY(-4px); }
.advan_list1 .pic { width: 66px; height: 66px; margin: 0 auto 14px; border-radius: 20px; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); transition: border-radius .3s, box-shadow .3s; }
.advan_list1 .pic svg { width: 30px; height: 30px; }
.advan_ico1 { background: linear-gradient(135deg, #12a4c9, var(--blue)); }
.advan_ico2 { background: linear-gradient(135deg, #ff7a80, var(--red)); }
.advan_ico3 { background: linear-gradient(135deg, #3a5a9e, var(--blue-deep)); }
.advan_ico4 { background: linear-gradient(135deg, #4da9df, #12a4c9); }
.advan_list1 .cell:hover .pic { border-radius: 50%; box-shadow: var(--shadow-md); }
.advan_list1 h4 { font-size: 17px; color: #333; margin-bottom: 6px; letter-spacing: 1px; }
.advan_list1 p { font-size: 12px; color: #9aa4b0; line-height: 1.9; }
.advan_list1 .cell:hover h4 { color: var(--blue); }

/* ===== 通用标题（两侧装饰线） ===== */
.main_tit { text-align: center; margin-bottom: 38px; }
.main_tit_z { font-size: 28px; color: #2b2f36; font-weight: bold; letter-spacing: 2px; display: flex; align-items: center; justify-content: center; gap: 18px; }
.main_tit_z::before, .main_tit_z::after { content: ""; width: 60px; height: 2px; flex-shrink: 0; background: linear-gradient(90deg, transparent, #c4d3dd); }
.main_tit_z::after { background: linear-gradient(90deg, #c4d3dd, transparent); }
.main_tit_f { font-size: 14px; color: #9aa4b0; margin-top: 7px; letter-spacing: 1px; }
.tit_line { display: block; width: 46px; height: 3px; background: var(--red); margin: 14px auto 0; border-radius: 2px; }

/* ===== 五大产品系列（卡片网格） ===== */
.series_sec { padding: 44px 0 30px; background: #fff; }
.series_grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 22px; }
.nsch_card { background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; display: flex; flex-direction: column; transition: transform .3s, box-shadow .3s, border-color .3s; }
.nsch_card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.series_grid .nsch_card:nth-child(-n+3) { grid-column: span 2; }
.series_grid .nsch_card:nth-child(n+4) { grid-column: span 3; }
.card_head { display: flex; align-items: center; gap: 14px; padding: 18px 22px; color: #fff; position: relative; overflow: hidden; }
.card_head::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 22px); }
.sg1 .card_head { background: linear-gradient(120deg, var(--blue), var(--blue-deep)); }
.sg2 .card_head { background: linear-gradient(120deg, var(--blue-dark), #0a2540); }
.sg3 .card_head { background: linear-gradient(120deg, #12a4c9, var(--blue)); }
.sg4 .card_head { background: linear-gradient(120deg, var(--blue-deep), var(--blue-dark)); }
.sg5 .card_head { background: linear-gradient(120deg, #00364d, var(--blue)); }
.card_no { font-size: 30px; font-weight: bold; font-family: "Segoe UI", Arial; opacity: .55; line-height: 1; position: relative; }
.card_head h3 { font-size: 17px; letter-spacing: 1px; line-height: 1.4; position: relative; }
.card_head i { display: block; font-style: normal; font-size: 11px; opacity: .75; letter-spacing: 1px; position: relative; }
.card_body { flex: 1; padding: 16px 22px 8px; }
.card_intro { font-size: 12.5px; color: #8a94a0; line-height: 1.8; padding-bottom: 10px; border-bottom: 1px dashed var(--line); margin-bottom: 10px; }
.card_body ul li { display: flex; gap: 8px; font-size: 12.5px; line-height: 1.7; padding: 4px 0; }
.card_body ul li::before { content: ""; flex-shrink: 0; width: 6px; height: 6px; border-radius: 50%; background: var(--red); margin-top: 7px; }
.card_body ul li b { flex-shrink: 0; color: var(--blue-deep); font-weight: bold; }
.card_body ul li span { color: #6b7683; }
.card_foot { padding: 10px 22px 18px; }
.more_btn { display: inline-block; padding: 7px 26px; border-radius: 20px; border: 1px solid var(--red); color: var(--red); font-size: 13px; letter-spacing: 1px; transition: all .2s; }
.more_btn:hover { background: var(--red); color: #fff; box-shadow: 0 6px 16px rgba(237, 45, 56, .3); }

/* ===== 滚动浮现 ===== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===== 行业应用 ===== */
.industry_sec { padding: 44px 0; background: linear-gradient(180deg, #f4f8fa, #eef4f8); }
.ind_grid { display: flex; gap: 20px; }
.ind_card { flex: 1; background: #fff; padding: 30px 24px; border-radius: 14px; border-top: 4px solid var(--blue); box-shadow: var(--shadow-sm); transition: transform .3s, box-shadow .3s; position: relative; overflow: hidden; }
.ind_card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--blue), #12a4c9); transform: scaleX(0); transform-origin: left; transition: transform .35s; }
.ind_card:hover::before { transform: scaleX(1); }
.ind_card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.ind_card h3 { font-size: 17px; color: var(--blue-deep); margin-bottom: 10px; line-height: 1.55; letter-spacing: .5px; }
.ind_card p { font-size: 13px; color: #8a94a0; margin-bottom: 18px; min-height: 62px; }
.ind_card a { font-size: 13px; color: var(--red); font-weight: bold; }
.ind_card a:hover { color: var(--red-dark); }

/* ===== 耐受环境 ===== */
.env_sec { padding: 44px 0; background: #fff; }
.env_grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.env_cell { border: 1px solid var(--line); border-radius: 12px; padding: 24px 26px 22px 30px; position: relative; overflow: hidden; transition: transform .25s, box-shadow .25s, border-color .25s; background: #fff; }
.env_cell::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(180deg, var(--blue), #12a4c9); transform: scaleY(0); transform-origin: top; transition: transform .3s; }
.env_cell:hover { border-color: transparent; box-shadow: var(--shadow-md); transform: translateY(-3px); }
.env_cell:hover::before { transform: scaleY(1); }
.env_cell b { display: block; font-size: 16px; color: #2b2f36; margin-bottom: 6px; letter-spacing: .5px; }
.env_cell span { font-size: 13px; color: #9aa4b0; }

/* ===== 技术资料 ===== */
.doc_sec { padding: 44px 0; background: linear-gradient(180deg, #f4f8fa, #eef4f8); }
.doc_col { width: calc(50% - 10px); float: left; background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); }
.doc_col:last-of-type { float: right; }
.doc_tit { background: linear-gradient(90deg, var(--blue), var(--blue-dark)); color: #fff; font-size: 16px; line-height: 46px; padding: 0 20px; letter-spacing: 2px; }
.doc_col ul { padding: 8px 20px 14px; }
.doc_col li { border-bottom: 1px dashed var(--line); }
.doc_col li:last-child { border-bottom: 0; }
.doc_col a { display: block; line-height: 42px; font-size: 13px; color: #6b7683; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: padding-left .2s, color .2s; }
.doc_col a::before { content: "›"; color: var(--red); margin-right: 8px; font-weight: bold; }
.doc_col a:hover { color: var(--blue); padding-left: 8px; }

/* ===== 关于我们 ===== */
.about_sec { padding: 44px 0; background: #fff; }
.about_con { padding: 0 20px; }
.about_con p { font-size: 14px; color: #55606c; line-height: 2.1; margin-bottom: 12px; text-indent: 2em; }
.about_con b { color: var(--blue-deep); }
.about_nums { display: flex; margin-top: 30px; text-align: center; background: linear-gradient(135deg, #f4f8fa, #eef4f8); border-radius: 14px; padding: 26px 0; }
.about_nums > div { flex: 1; position: relative; }
.about_nums > div + div::before { content: ""; position: absolute; left: 0; top: 15%; bottom: 15%; width: 1px; background: #d8e2ea; }
.about_nums strong { display: block; font-size: 42px; color: var(--red); font-family: "Segoe UI", Arial; line-height: 1.2; }
.about_nums span { font-size: 13px; color: #8a94a0; letter-spacing: 1px; }

/* ===== 联系我们 ===== */
.contact_sec { padding: 44px 0 54px; background: linear-gradient(180deg, #f4f8fa, #eef4f8); }
.contact_wrap { display: flex; gap: 44px; }
.contact_info { width: 42%; font-size: 14px; color: #55606c; }
.contact_info p { margin-bottom: 11px; line-height: 1.9; }
.contact_info b { color: var(--blue-deep); }
.contact_note { font-size: 12px !important; color: #a5aeb8 !important; border-top: 1px dashed #d8e2ea; padding-top: 14px; margin-top: 18px; }
.contact_form { flex: 1; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 26px 28px; box-shadow: var(--shadow-sm); }
.contact_form input, .contact_form textarea { width: 100%; border: 1px solid #dde4ea; border-radius: 8px; padding: 11px 14px; font-size: 13px; margin-bottom: 13px; outline: none; font-family: inherit; resize: vertical; transition: border-color .2s, box-shadow .2s; }
.contact_form input:focus, .contact_form textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0, 120, 170, .12); }
.contact_form button { width: 100%; height: 46px; border: 0; border-radius: 8px; background: linear-gradient(135deg, var(--red), var(--red-dark)); color: #fff; font-size: 16px; letter-spacing: 4px; cursor: pointer; transition: transform .15s, filter .2s; }
.contact_form button:hover { filter: brightness(1.08); transform: translateY(-1px); }
.form_tip { font-size: 12px; color: #1a9c46; min-height: 18px; margin-top: 9px; }

/* ===== 页脚 ===== */
.footer { background: linear-gradient(180deg, #06305c, var(--blue-deep)); color: #c3d2ea; padding: 30px 0 24px; font-size: 13px; }
.foot_keys { line-height: 2.1; }
.foot_keys b { color: #fff; margin-right: 8px; }
.foot_keys a { color: #c3d2ea; margin-right: 13px; transition: color .2s; }
.foot_keys a:hover { color: #fff; }
.foot_line { border-top: 1px solid rgba(255,255,255,.14); margin: 15px 0; }
.foot_con { text-align: center; line-height: 2.1; }
.foot_con a { color: #c3d2ea; }
.foot_con a:hover { color: #fff; }
.foot_note { font-size: 12px; color: #7e97c2; }

/* ===== 回到顶部 ===== */
.back_top { position: fixed; right: 28px; bottom: 70px; width: 48px; height: 48px; background: linear-gradient(135deg, var(--blue), var(--blue-dark)); color: #fff; text-align: center; line-height: 48px; font-size: 12px; cursor: pointer; display: none; z-index: 50; border-radius: 50%; box-shadow: var(--shadow-md); transition: transform .2s, filter .2s; }
.back_top:hover { transform: translateY(-3px); filter: brightness(1.1); }
.back_top.show { display: block; animation: popIn .25s ease; }

/* ===== 响应式 ===== */
@media (max-width: 1000px) {
  .search { display: none; }
  .nav ul { flex-wrap: wrap; }
  .nav li a { padding: 0 14px; font-size: 14px; line-height: 42px; }
  .jiaodian_main { flex-direction: column; }
  .menu-box { width: 100%; }
  .index_focus { flex: none; width: 100%; height: 230px; margin-top: 12px; }
  .index_focus .bd { min-height: 0; height: 100%; }
  .slide-inner { padding: 0 30px; }
  .slide-inner h2 { font-size: 24px; }
  .slide-inner p { font-size: 13px; }
  .advan_list1 { flex-wrap: wrap; }
  .advan_list1 .cell { flex: 1 1 50%; border-bottom: 1px solid var(--line); }
  .series_grid { display: block; }
  .nsch_card { margin-bottom: 16px; }
  .ind_card { margin-bottom: 16px; }
  .env_grid { grid-template-columns: 1fr; }
  .doc_col { width: 100%; float: none !important; margin-bottom: 16px; }
  .contact_wrap { flex-direction: column; }
  .contact_info { width: 100%; }
  .logo_tel strong { font-size: 22px; }
  .main_tit_z { font-size: 22px; }
  .main_tit_z::before, .main_tit_z::after { width: 24px; }
}