/*
Theme Name: TTop Modern
Description: Modern B2B industrial theme for ttopmark.com — Mega Menu, SEO/GEO ready (JSON-LD, OG, semantic HTML5). Business logic aligned with theme_ttop (URL structure unchanged).
Author: WorkBuddy
Version: 1.0.0
Text Domain: ttop-modern
*/

/* ═══════════ Design tokens ═══════════ */
:root {
	--tt-navy: #0e2a47;      /* 主深色 */
	--tt-navy-2: #123a61;
	--tt-blue: #1a6fd4;      /* 品牌蓝 */
	--tt-teal: #00a99d;      /* 强调青 */
	--tt-amber: #f5a623;
	--tt-ink: #1c2b3a;       /* 正文 */
	--tt-muted: #5c6b7a;
	--tt-line: #e3e9f0;
	--tt-bg: #f5f7fa;
	--tt-card: #ffffff;
	--tt-radius: 10px;
	--tt-shadow: 0 6px 24px rgba(14, 42, 71, .10);
	--tt-maxw: 1200px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
	margin: 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
	color: var(--tt-ink);
	background: #fff;
	line-height: 1.7;
	font-size: 16px;
}
img { max-width: 100%; height: auto; }
a { color: var(--tt-blue); text-decoration: none; }
a:hover { color: var(--tt-navy); }
.t-wrap { max-width: var(--tt-maxw); margin: 0 auto; padding: 0 20px; }

/* ═══════════ Utility bar ═══════════ */
.t-topbar { background: var(--tt-navy); color: #cfe0f2; font-size: 13px; }
.t-topbar .t-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 36px; gap: 16px; }
.t-topbar a { color: #eaf2fb; }
.t-topbar a:hover { color: #fff; }
.t-topbar .t-contacts { display: flex; gap: 18px; align-items: center; }
.t-topbar .t-socials { display: flex; gap: 14px; align-items: center; }
.t-topbar .t-socials a { opacity: .85; }
.t-topbar .t-socials a:hover { opacity: 1; }

/* 语言切换 */
.t-lang { position: relative; }
.t-lang-btn { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.28); border-radius: 999px; color: #eaf2fb; font-size: 13px; padding: 5px 14px; font-family: inherit; }
.t-lang-caret { font-size: 10px; opacity: .8; }
.t-lang-menu { position: absolute; right: 0; top: 100%; background: #fff; border: 1px solid var(--tt-line); border-radius: 8px; box-shadow: var(--tt-shadow); min-width: 140px; padding: 6px 0; display: none; z-index: 60; }
.t-lang.open .t-lang-menu { display: block; }
.t-lang-menu a { display: block; padding: 7px 14px; color: var(--tt-ink); font-size: 13px; }
.t-lang-menu a:hover, .t-lang-menu .current-lang a { background: var(--tt-bg); color: var(--tt-blue); }

/* ═══════════ Header / Mega Menu ═══════════ */
.t-header { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--tt-line); transition: box-shadow .2s; }
.t-header.is-stuck { box-shadow: 0 4px 18px rgba(14,42,71,.08); }
.t-header .t-wrap { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.t-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.t-logo img { max-height: 48px; width: auto; }
.t-logo .t-logo-text { font-size: 20px; font-weight: 700; color: var(--tt-navy); letter-spacing: .3px; }
.t-logo .t-logo-text small { display: block; font-size: 11px; font-weight: 400; color: var(--tt-muted); letter-spacing: 1px; }

.t-nav { margin-left: auto; }
.t-nav > ul { display: flex; list-style: none; margin: 0; padding: 0; gap: 2px; }
.t-nav li { position: relative; }
.t-nav a { display: block; padding: 24px 13px; color: var(--tt-ink); font-size: 15px; font-weight: 600; }
.t-nav > ul > li > a { border-bottom: 3px solid transparent; }
.t-nav > ul > li:hover > a, .t-nav > ul > li:focus-within > a, .t-nav > ul > li.current-cat > a, .t-nav > ul > li.is-active > a { color: var(--tt-blue); border-bottom-color: var(--tt-blue); }

/* Mega panel */
.t-mega {
	position: absolute; left: 50%; transform: translateX(-50%) translateY(8px);
	top: 100%; width: min(720px, calc(100vw - 40px));
	background: #fff; border: 1px solid var(--tt-line); border-top: 3px solid var(--tt-blue);
	border-radius: 0 0 var(--tt-radius) var(--tt-radius); box-shadow: var(--tt-shadow);
	padding: 22px 26px; opacity: 0; visibility: hidden; transition: opacity .18s, transform .18s, visibility .18s;
	z-index: 55;
}
.t-nav li:hover > .t-mega, .t-nav li:focus-within > .t-mega { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.t-mega-head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 12px; margin-bottom: 14px; border-bottom: 1px dashed var(--tt-line); }
.t-mega-head strong { font-size: 15px; color: var(--tt-navy); }
.t-mega-head a { font-size: 13px; font-weight: 600; }
.t-mega ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px 22px; }
.t-mega ul a { padding: 8px 10px; margin: 0 -10px; font-size: 14px; font-weight: 400; color: var(--tt-muted); border-radius: 6px; }
.t-mega ul a:hover { color: var(--tt-blue); background: var(--tt-bg); }

/* 头部右侧 */
.t-header-actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.t-search-btn { display: inline-flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--tt-line); background: #fff; cursor: pointer; color: var(--tt-muted); }
.t-search-btn:hover { color: var(--tt-blue); border-color: var(--tt-blue); }
.t-cta { display: inline-block; background: var(--tt-blue); color: #fff !important; font-size: 14px; font-weight: 600; padding: 10px 20px; border-radius: 8px; }
.t-cta:hover { background: var(--tt-navy); }

/* 搜索弹层 */
.t-search-layer { position: fixed; inset: 0; background: rgba(14,42,71,.55); display: none; align-items: flex-start; justify-content: center; padding: 120px 20px 0; z-index: 90; }
.t-search-layer.open { display: flex; }
.t-search-box { background: #fff; border-radius: var(--tt-radius); padding: 26px; width: min(620px, 100%); position: relative; box-shadow: var(--tt-shadow); }
.t-search-close { position: absolute; top: -14px; right: -14px; width: 34px; height: 34px; border-radius: 50%; border: 0; background: var(--tt-navy); color: #fff; cursor: pointer; font-size: 16px; }
.t-search-box form { display: flex; gap: 10px; }
.t-search-box input[type="search"] { flex: 1; padding: 12px 16px; border: 1px solid var(--tt-line); border-radius: 8px; font-size: 15px; outline: none; }
.t-search-box input[type="search"]:focus { border-color: var(--tt-blue); }
.t-search-box button { padding: 12px 24px; background: var(--tt-blue); border: 0; color: #fff; border-radius: 8px; font-size: 15px; cursor: pointer; }

/* 汉堡（移动端） */
.t-burger { display: none; width: 42px; height: 42px; border: 1px solid var(--tt-line); background: #fff; border-radius: 8px; cursor: pointer; position: relative; }
.t-burger span, .t-burger span::before, .t-burger span::after { content: ""; position: absolute; left: 10px; right: 10px; height: 2px; background: var(--tt-navy); border-radius: 2px; transition: .2s; }
.t-burger span { top: 50%; margin-top: -1px; }
.t-burger span::before { top: -7px; }
.t-burger span::after { top: 7px; }
body.nav-open .t-burger span { background: transparent; }
body.nav-open .t-burger span::before { top: 0; transform: rotate(45deg); }
body.nav-open .t-burger span::after { top: 0; transform: rotate(-45deg); }

/* ═══════════ Hero / 面包屑条 ═══════════ */
.t-hero { background: linear-gradient(120deg, var(--tt-navy) 0%, var(--tt-navy-2) 55%, #14508a 100%); color: #fff; padding: 74px 0 78px; }
.t-hero h1 { font-size: 38px; line-height: 1.25; margin: 0 0 14px; }
.t-hero p { font-size: 17px; color: #c9dbee; max-width: 720px; margin: 0 0 26px; }
.t-hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.t-btn { display: inline-block; padding: 12px 26px; border-radius: 8px; font-weight: 600; font-size: 15px; }
.t-btn-primary { background: var(--tt-teal); color: #fff !important; }
.t-btn-primary:hover { background: #00948a; }
.t-btn-ghost { border: 1px solid rgba(255,255,255,.45); color: #fff !important; }
.t-btn-ghost:hover { background: rgba(255,255,255,.1); }

.t-pagehead { background: linear-gradient(120deg, var(--tt-navy) 0%, #14508a 100%); color: #fff; padding: 44px 0; }
.t-pagehead h1 { font-size: 30px; margin: 0 0 8px; }
.t-pagehead .t-crumb, .t-crumb { font-size: 13px; color: #9fb8d4; }
.t-pagehead .t-crumb a { color: #d6e4f4; }
.t-crumb { padding: 14px 0 0; color: var(--tt-muted); }
.t-crumb a { color: var(--tt-muted); }
.t-crumb a:hover { color: var(--tt-blue); }
.t-crumb-sep { margin: 0 4px; opacity: .6; }

/* 栏目 tab（同级栏目） */
.t-cattabs { background: #fff; border-bottom: 1px solid var(--tt-line); position: sticky; top: 72px; z-index: 30; }
.t-cattabs ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.t-cattabs a { display: block; padding: 13px 16px; font-size: 14px; font-weight: 600; color: var(--tt-muted); white-space: nowrap; border-bottom: 3px solid transparent; }
.t-cattabs a.on, .t-cattabs a:hover { color: var(--tt-blue); border-bottom-color: var(--tt-blue); }

/* ═══════════ 列表 ═══════════ */
.t-section { padding: 48px 0 64px; }
.t-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.t-grid-4 { grid-template-columns: repeat(4, 1fr); }
.t-card { background: var(--tt-card); border: 1px solid var(--tt-line); border-radius: var(--tt-radius); overflow: hidden; display: flex; flex-direction: column; transition: transform .18s, box-shadow .18s; }
.t-card:hover { transform: translateY(-3px); box-shadow: var(--tt-shadow); }
.t-card-thumb { aspect-ratio: 16/9; background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-blue) 100%); position: relative; overflow: hidden; }
.t-card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.t-card-thumb.t-noimg::after { content: attr(data-abbr); position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.85); font-size: 26px; font-weight: 700; letter-spacing: 2px; }
.t-card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }
.t-card-date { font-size: 12.5px; color: var(--tt-muted); margin: 0 0 8px; }
.t-card-title { font-size: 16.5px; line-height: 1.45; margin: 0 0 8px; }
.t-card-title a { color: var(--tt-ink); }
.t-card-title a:hover { color: var(--tt-blue); }
.t-card-desc { font-size: 13.5px; color: var(--tt-muted); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* 分页 */
.t-pagination { margin-top: 40px; text-align: center; }
.t-pagination .nav-links { display: inline-flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.t-pagination .page-numbers { display: inline-block; min-width: 40px; padding: 9px 12px; border: 1px solid var(--tt-line); border-radius: 8px; color: var(--tt-ink); font-size: 14px; }
.t-pagination .page-numbers.current { background: var(--tt-blue); border-color: var(--tt-blue); color: #fff; }
.t-pagination .page-numbers:hover:not(.current) { border-color: var(--tt-blue); color: var(--tt-blue); }

/* ═══════════ 详情页 ═══════════ */
.t-single { padding: 36px 0 64px; }
.t-single-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 40px; align-items: start; }
.t-article h1 { font-size: 30px; line-height: 1.35; margin: 6px 0 14px; color: var(--tt-navy); }
.t-article-meta { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--tt-muted); padding-bottom: 18px; border-bottom: 1px solid var(--tt-line); margin-bottom: 24px; }
.t-content { font-size: 16px; color: var(--tt-ink); overflow-wrap: break-word; }
.t-content h2 { font-size: 24px; color: var(--tt-navy); margin: 34px 0 14px; padding-left: 12px; border-left: 4px solid var(--tt-blue); }
.t-content h3 { font-size: 19px; color: var(--tt-navy); margin: 26px 0 10px; }
.t-content img { border-radius: 8px; }
.t-content table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px; }
.t-content th, .t-content td { border: 1px solid var(--tt-line); padding: 9px 12px; text-align: left; }
.t-content th { background: var(--tt-bg); }
.t-content blockquote { margin: 18px 0; padding: 14px 20px; border-left: 4px solid var(--tt-teal); background: var(--tt-bg); border-radius: 0 8px 8px 0; color: var(--tt-muted); }
.t-content a { text-decoration: underline; text-underline-offset: 3px; }

.t-lead { background: var(--tt-bg); border: 1px solid var(--tt-line); border-radius: var(--tt-radius); padding: 16px 20px; font-size: 14.5px; color: var(--tt-muted); margin-bottom: 24px; }

.t-relblock { margin-top: 38px; padding-top: 26px; border-top: 1px solid var(--tt-line); }
.t-relblock h2 { font-size: 20px; color: var(--tt-navy); margin: 0 0 16px; }
.t-relblock ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; }
.t-relblock li a { display: block; padding: 10px 14px; background: var(--tt-bg); border-radius: 8px; font-size: 14px; color: var(--tt-ink); }
.t-relblock li a:hover { background: #e8f1fb; color: var(--tt-blue); }

.t-prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 34px; }
.t-prevnext .box { background: var(--tt-bg); border-radius: var(--tt-radius); padding: 14px 18px; font-size: 13px; }
.t-prevnext .box span { color: var(--tt-muted); display: block; margin-bottom: 6px; }
.t-prevnext .box a { font-weight: 600; font-size: 14.5px; }
.t-prevnext .box.next { text-align: right; }

/* 侧栏 */
.t-side { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 22px; }
.t-sidebox { background: #fff; border: 1px solid var(--tt-line); border-radius: var(--tt-radius); padding: 20px; }
.t-sidebox h3 { font-size: 16px; margin: 0 0 14px; color: var(--tt-navy); padding-bottom: 10px; border-bottom: 1px solid var(--tt-line); }
.t-sidebox ul { list-style: none; margin: 0; padding: 0; }
.t-sidebox li { padding: 8px 0; border-bottom: 1px dashed var(--tt-line); font-size: 14px; }
.t-sidebox li:last-child { border-bottom: 0; }
.t-sidebox li a { color: var(--tt-ink); }
.t-sidebox li a:hover { color: var(--tt-blue); }
.t-side-cta { background: linear-gradient(135deg, var(--tt-navy) 0%, var(--tt-blue) 100%); color: #fff; border: 0; }
.t-side-cta h3 { color: #fff; border-bottom-color: rgba(255,255,255,.2); }
.t-side-cta p { font-size: 13.5px; color: #c9dbee; margin: 0 0 14px; }
.t-side-cta a { color: #fff; }

/* ═══════════ 首页区块 ═══════════ */
.t-home-cats { padding: 56px 0; background: var(--tt-bg); }
.t-sec-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 28px; }
.t-sec-head h2 { font-size: 26px; margin: 0; color: var(--tt-navy); }
.t-sec-head a { font-size: 14px; font-weight: 600; }
.t-catcard { background: #fff; border: 1px solid var(--tt-line); border-radius: var(--tt-radius); padding: 24px 22px; text-align: center; transition: transform .18s, box-shadow .18s; display: block; color: var(--tt-ink); }
.t-catcard:hover { transform: translateY(-3px); box-shadow: var(--tt-shadow); color: var(--tt-blue); }
.t-catcard .ico { width: 52px; height: 52px; margin: 0 auto 14px; border-radius: 14px; background: linear-gradient(135deg, var(--tt-blue), var(--tt-teal)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 700; }
.t-catcard strong { font-size: 15.5px; display: block; margin-bottom: 4px; }
.t-catcard small { color: var(--tt-muted); font-size: 12.5px; }

.t-usps { padding: 54px 0; }
.t-usps .t-grid { grid-template-columns: repeat(4, 1fr); }
.t-usp { text-align: center; padding: 10px 14px; }
.t-usp .n { font-size: 30px; font-weight: 800; color: var(--tt-blue); }
.t-usp p { margin: 6px 0 0; font-size: 14px; color: var(--tt-muted); }

/* ═══════════ Footer ═══════════ */
.t-footer { background: var(--tt-navy); color: #b9cde2; margin-top: 20px; }
.t-footer a { color: #d9e6f4; }
.t-footer a:hover { color: #fff; }
.t-footer-main { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; padding: 52px 0 40px; }
.t-footer h4 { color: #fff; font-size: 15px; margin: 0 0 16px; letter-spacing: .5px; }
.t-footer ul { list-style: none; margin: 0; padding: 0; }
.t-footer li { margin-bottom: 9px; font-size: 13.5px; }
.t-footer .t-about p { font-size: 13.5px; line-height: 1.8; margin: 0 0 16px; }
.t-footer .t-socials { display: flex; gap: 12px; }
.t-footer .t-socials a { width: 34px; height: 34px; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; }
.t-footer .t-socials svg { width: 16px; height: 16px; fill: currentColor; }
.t-footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 18px 0; font-size: 12.5px; text-align: center; color: #8fabc9; }

/* ═══════════ 404 ═══════════ */
.t-404 { text-align: center; padding: 110px 0 130px; }
.t-404 .code { font-size: 96px; font-weight: 800; color: var(--tt-navy); line-height: 1; }
.t-404 p { color: var(--tt-muted); }

/* ═══════════ 响应式 ═══════════ */
@media (max-width: 1080px) {
	.t-nav { display: none; position: fixed; inset: 0; top: 0; padding: 80px 20px 40px; background: #fff; overflow-y: auto; z-index: 80; margin: 0; }
	body.nav-open .t-nav { display: block; }
	.t-nav > ul { flex-direction: column; gap: 0; }
	.t-nav > ul > li { border-bottom: 1px solid var(--tt-line); }
	.t-nav a { padding: 15px 4px; }
	.t-nav > ul > li > a { border-bottom: 0; font-size: 16px; }
	.t-mega { position: static; transform: none; width: auto; opacity: 1; visibility: hidden; display: none; box-shadow: none; border: 0; border-top: 1px dashed var(--tt-line); border-radius: 0; padding: 4px 0 14px; }
	.t-nav li.has-mega.open > .t-mega { display: block; visibility: visible; opacity: 1; }
	.t-mega ul { grid-template-columns: 1fr; }
	.t-mega ul a { padding: 9px 4px; margin: 0; }
	.t-mega-head { display: none; }
	.t-nav li.has-mega > a::after { content: "+"; float: right; font-weight: 400; color: var(--tt-muted); }
	.t-nav li.has-mega.open > a::after { content: "\2212"; }

	.t-burger { display: block; z-index: 85; }
	.t-header .t-cta { display: none; }
	.t-topbar .t-contacts span.hide-m { display: none; }
	.t-single-layout { grid-template-columns: 1fr; }
	.t-side { position: static; }
	.t-grid, .t-grid-4, .t-usps .t-grid { grid-template-columns: repeat(2, 1fr); }
	.t-footer-main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
	.t-hero { padding: 52px 0; }
	.t-hero h1 { font-size: 27px; }
	.t-grid, .t-grid-4, .t-usps .t-grid, .t-relblock ul, .t-prevnext, .t-footer-main { grid-template-columns: 1fr; }
	.t-prevnext .box.next { text-align: left; }
	.t-article h1 { font-size: 23px; }
	.t-cattabs { top: 60px; }
	.t-header .t-wrap { min-height: 60px; }
}