/* ============================================================
   腾工重工 TENGHEAVY · 腾数网工业装备演示模板
   钢青 + 工业橙 · 深色重工风 · PC 自适应
   ============================================================ */
:root {
  --navy: #0e2a47;
  --navy-deep: #081c33;
  --navy-soft: #16395e;
  --accent: #f26b1d;
  --accent-soft: #ff8a3d;
  --blue: #3d7bd8;
  --ink: #13202f;
  --muted: #5c6b7d;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f4f7fa;
  --radius: 0.75rem;
  --radius-lg: 1.25rem;
  --shadow: 0 1.25rem 3rem rgba(14, 42, 71, 0.1);
  --container: 75rem;
  --font: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ---------- base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body { font-family: var(--font); color: var(--ink); background: var(--bg); font-size: 1rem; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; }

.section { max-width: var(--container); margin: 0 auto; padding: 6rem 2rem; }
.section-kicker { display: inline-flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; color: var(--accent); font-size: 0.8125rem; font-weight: 700; letter-spacing: 0.18em; }
.section-kicker::before { content: ""; width: 1.75rem; height: 2px; background: var(--accent); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; margin-bottom: 3rem; }
.section-head h2 { font-size: clamp(1.75rem, 3.2vw, 2.625rem); font-weight: 800; color: var(--navy); }
.section-head > p { max-width: 22rem; color: var(--muted); font-size: 0.9375rem; }

/* ---------- buttons ---------- */
.btn-primary { display: inline-flex; align-items: center; gap: 0.625rem; padding: 0.875rem 1.5rem; border-radius: 0.5rem; background: linear-gradient(100deg, var(--accent), var(--accent-soft)); color: #fff; font-size: 0.9375rem; font-weight: 700; box-shadow: 0 0.75rem 1.75rem rgba(242, 107, 29, 0.28); transition: transform 0.2s, box-shadow 0.2s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 1rem 2.25rem rgba(242, 107, 29, 0.36); }
.btn-ghost { display: inline-flex; align-items: center; padding: 0.8125rem 1.375rem; border: 1px solid rgba(255, 255, 255, 0.45); border-radius: 0.5rem; color: #fff; font-size: 0.9375rem; font-weight: 600; transition: background 0.2s, border-color 0.2s; }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); border-color: rgba(255, 255, 255, 0.7); }

/* ---------- header ---------- */
.site-header { position: fixed; inset: 0 0 auto; z-index: 100; background: rgba(8, 28, 51, 0.88); transition: background 0.3s, box-shadow 0.3s; }
.site-header.scrolled-mode { background: rgba(8, 28, 51, 0.97); box-shadow: 0 0.5rem 1.5rem rgba(4, 14, 26, 0.35); }
.header-inner { display: flex; align-items: center; max-width: var(--container); height: 4.5rem; margin: 0 auto; padding: 0 2rem; }
.brand { display: inline-flex; align-items: center; gap: 0.75rem; color: #fff; }
.brand b { display: grid; width: 2.375rem; height: 2.375rem; place-items: center; border-radius: 0.5rem; background: linear-gradient(135deg, var(--accent), var(--accent-soft)); font-size: 1.125rem; font-weight: 800; }
.brand span { display: flex; flex-direction: column; font-size: 1.0625rem; font-weight: 700; line-height: 1.15; }
.brand small { color: #8fa8c4; font-size: 0.625rem; font-weight: 500; letter-spacing: 0.06em; }
.main-nav { display: flex; align-items: center; gap: 2rem; margin-left: auto; }
.main-nav > a:not(.nav-cta) { position: relative; color: #c3d2e2; font-size: 0.9375rem; font-weight: 500; transition: color 0.2s; }
.main-nav > a:not(.nav-cta)::after { content: ""; position: absolute; right: 0; bottom: -0.375rem; left: 0; height: 2px; border-radius: 2px; background: var(--accent); transform: scaleX(0); transition: transform 0.2s; }
.main-nav > a:not(.nav-cta):hover { color: #fff; }
.main-nav > a:not(.nav-cta):hover::after { transform: scaleX(1); }
.nav-cta { display: inline-flex; align-items: center; gap: 0.375rem; padding: 0.625rem 1.125rem; border-radius: 0.5rem; background: var(--accent); color: #fff; font-size: 0.875rem; font-weight: 700; transition: background 0.2s; }
.nav-cta:hover { background: var(--accent-soft); }
.menu-toggle { display: none; margin-left: auto; color: #fff; font-size: 1.5rem; }

/* ---------- hero carousel ---------- */
.hero { position: relative; overflow: hidden; background: var(--navy-deep); }
.hero-track { display: flex; transition: transform 0.65s cubic-bezier(0.65, 0, 0.35, 1); }
.hero-slide { position: relative; flex: 0 0 100%; display: flex; align-items: center; min-height: 42.5rem; padding: 9rem 2rem 7rem; background: var(--navy-deep) center/cover no-repeat; }
.hero-slide-alt { background: radial-gradient(48rem 30rem at 78% 18%, rgba(61, 123, 216, 0.32), transparent 60%), radial-gradient(40rem 26rem at 12% 88%, rgba(242, 107, 29, 0.18), transparent 60%), var(--navy-deep); }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(6, 19, 34, 0.94) 0%, rgba(8, 25, 43, 0.82) 42%, rgba(8, 25, 43, 0.35) 75%, rgba(8, 25, 43, 0.55)), linear-gradient(0deg, rgba(6, 17, 31, 0.75), transparent 55%); }
.hero-slide-alt .hero-shade { background: linear-gradient(0deg, rgba(6, 17, 31, 0.55), transparent 60%); }
.hero-copy { position: relative; z-index: 2; width: 100%; max-width: var(--container); margin: 0 auto; }
.hero-copy > * { max-width: 40rem; }
.eyebrow { display: inline-flex; align-items: center; gap: 0.625rem; margin-bottom: 1.25rem; color: var(--accent-soft); font-size: 0.8125rem; font-weight: 700; letter-spacing: 0.2em; }
.eyebrow i { width: 1.75rem; height: 2px; background: var(--accent); }
.hero h1 { color: #fff; font-size: clamp(2.25rem, 4.6vw, 3.75rem); font-weight: 800; line-height: 1.08; }
.hero h1 em { font-style: normal; background: linear-gradient(100deg, var(--accent-soft), #ffc53d); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy > p { margin-top: 1.375rem; color: #b9c9da; font-size: 1.0625rem; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.25rem; }
.hero-arrow { position: absolute; top: 50%; z-index: 5; display: grid; width: 3rem; height: 3rem; place-items: center; border: 1px solid rgba(255, 255, 255, 0.25); border-radius: 50%; color: #fff; font-size: 1.125rem; transform: translateY(-50%); transition: background 0.2s, border-color 0.2s; }
.hero-arrow:hover { background: rgba(255, 255, 255, 0.14); border-color: rgba(255, 255, 255, 0.5); }
.hero-prev { left: 1.5rem; }
.hero-next { right: 1.5rem; }
.hero-dots { position: absolute; bottom: 2rem; left: 50%; z-index: 5; display: flex; gap: 0.625rem; transform: translateX(-50%); }
.hero-dots button { width: 2rem; height: 0.25rem; border-radius: 0.25rem; background: rgba(255, 255, 255, 0.28); transition: background 0.25s, width 0.25s; }
.hero-dots button.active-mode { width: 3rem; background: var(--accent); }

/* hero 数字孪生面板（第三屏构图） */
.hero-panel { position: absolute; right: max(2rem, calc((100% - var(--container)) / 2 + 2rem)); top: 50%; z-index: 3; width: 21rem; padding: 1.375rem; border: 1px solid rgba(255, 255, 255, 0.14); border-radius: var(--radius-lg); background: rgba(13, 38, 66, 0.78); box-shadow: 0 2rem 4rem rgba(2, 10, 20, 0.5); backdrop-filter: blur(10px); transform: translateY(-50%); }
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.125rem; color: #8fa8c4; font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.14em; }
.panel-head b { padding: 0.25rem 0.5rem; border-radius: 999px; background: rgba(38, 186, 143, 0.16); color: #5adfb2; font-size: 0.625rem; letter-spacing: 0.04em; }
.panel-bars { display: flex; align-items: flex-end; gap: 0.5rem; height: 6.5rem; padding: 0.75rem 0.25rem; border-radius: var(--radius); background: rgba(255, 255, 255, 0.04); }
.panel-bars i { flex: 1; height: var(--h); border-radius: 0.25rem 0.25rem 0 0; background: linear-gradient(180deg, var(--accent-soft), rgba(242, 107, 29, 0.25)); }
.panel-bars i:nth-child(even) { background: linear-gradient(180deg, #6ea3ec, rgba(61, 123, 216, 0.25)); }
.panel-rows { display: grid; gap: 0.5rem; margin-top: 1rem; }
.panel-rows li { display: flex; align-items: center; justify-content: space-between; padding: 0.625rem 0.75rem; border-radius: 0.5rem; background: rgba(255, 255, 255, 0.05); color: #9fb4ca; font-size: 0.8125rem; }
.panel-rows b { color: #fff; font-size: 0.9375rem; }

/* ---------- metrics ---------- */
.metrics { background: linear-gradient(180deg, var(--navy-deep), var(--navy)); }
.metrics-inner { display: grid; max-width: var(--container); margin: 0 auto; padding: 3.25rem 2rem; grid-template-columns: repeat(4, 1fr); }
.metric { padding: 0 1.5rem; text-align: center; }
.metric + .metric { border-left: 1px solid rgba(255, 255, 255, 0.12); }
.metric strong { display: block; color: #fff; font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; font-variant-numeric: tabular-nums; }
.metric strong .suffix, .metric-static { color: #fff; }
.metric span { display: block; margin-top: 0.375rem; color: #93a9c0; font-size: 0.875rem; }

/* ---------- solutions ---------- */
.solution-grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(4, 1fr); }
.solution-card { position: relative; padding: 2rem 1.5rem 1.5rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; overflow: hidden; transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s; }
.solution-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 0.25rem; background: linear-gradient(90deg, var(--blue), var(--accent)); opacity: 0; transition: opacity 0.25s; }
.solution-card:hover { transform: translateY(-0.375rem); border-color: transparent; box-shadow: var(--shadow); }
.solution-card:hover::before { opacity: 1; }
.solution-index { position: absolute; top: 1.25rem; right: 1.25rem; color: #e8eef5; font-size: 1.75rem; font-weight: 800; }
.solution-card > i { display: grid; width: 3rem; height: 3rem; place-items: center; margin-bottom: 1.25rem; border-radius: 0.75rem; background: linear-gradient(135deg, rgba(14, 42, 71, 0.08), rgba(242, 107, 29, 0.12)); color: var(--navy); font-size: 1.375rem; }
.solution-card h3 { font-size: 1.125rem; font-weight: 700; color: var(--navy); }
.solution-card > p { margin-top: 0.625rem; color: var(--muted); font-size: 0.875rem; min-height: 3.9rem; }
.solution-result { display: inline-flex; align-items: baseline; gap: 0.375rem; margin-top: 1rem; padding: 0.5rem 0.75rem; border-radius: 0.5rem; background: var(--bg-soft); color: var(--muted); font-size: 0.8125rem; }
.solution-result b { color: var(--accent); font-size: 1rem; }

/* ---------- products ---------- */
.products { background: var(--bg-soft); max-width: none; }
.products > * { max-width: var(--container); margin-left: auto; margin-right: auto; }
.products .section-head { margin-bottom: 2.5rem; }
.product-tabs { padding: 0 2rem; }
.products.section { padding-left: 0; padding-right: 0; }
.tab-list { display: flex; gap: 0.5rem; margin-bottom: 2rem; border-bottom: 1px solid var(--line); }
.tab-btn { position: relative; padding: 0.875rem 1.25rem; color: var(--muted); font-size: 1rem; font-weight: 600; transition: color 0.2s; }
.tab-btn::after { content: ""; position: absolute; right: 0; bottom: -1px; left: 0; height: 0.1875rem; border-radius: 0.1875rem; background: var(--accent); transform: scaleX(0); transition: transform 0.25s; }
.tab-btn:hover { color: var(--navy); }
.tab-btn.active-mode { color: var(--navy); }
.tab-btn.active-mode::after { transform: scaleX(1); }
.tab-panel { display: grid; gap: 3rem; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); align-items: center; padding: 2.5rem; border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow); }
.tab-panel[hidden] { display: none; }
.product-model { display: inline-block; margin-bottom: 0.75rem; padding: 0.25rem 0.75rem; border-radius: 999px; background: rgba(61, 123, 216, 0.1); color: var(--blue); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; }
.product-copy h3 { font-size: 1.625rem; font-weight: 800; color: var(--navy); }
.product-copy > p { margin-top: 0.875rem; color: var(--muted); font-size: 0.9375rem; }
.spec-table { display: grid; gap: 0.625rem; margin: 1.5rem 0 1.75rem; grid-template-columns: repeat(2, 1fr); }
.spec-table > div { padding: 0.875rem 1rem; border: 1px solid var(--line); border-radius: var(--radius); }
.spec-table dt { color: var(--muted); font-size: 0.75rem; }
.spec-table dd { margin: 0.25rem 0 0; color: var(--navy); font-size: 1.0625rem; font-weight: 700; }
.product-visual { display: grid; place-items: center; gap: 1rem; padding: 2rem; border-radius: var(--radius-lg); background: radial-gradient(20rem 14rem at 50% 30%, rgba(61, 123, 216, 0.12), transparent 70%), var(--navy-deep); }
.product-visual svg { width: min(100%, 22rem); }
.product-visual small { color: #7e96b1; font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.22em; }

/* ---------- craft ---------- */
.craft-steps { position: relative; display: grid; gap: 1.5rem; grid-template-columns: repeat(4, 1fr); }
.craft-steps::before { content: ""; position: absolute; top: 2.5rem; right: 6%; left: 6%; height: 2px; background: repeating-linear-gradient(90deg, var(--line) 0 0.5rem, transparent 0.5rem 1rem); }
.craft-steps li { position: relative; padding: 1.75rem 1.5rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; transition: transform 0.25s, box-shadow 0.25s; }
.craft-steps li:hover { transform: translateY(-0.375rem); box-shadow: var(--shadow); }
.step-no { position: absolute; top: -1rem; left: 1.5rem; padding: 0.25rem 0.75rem; border-radius: 999px; background: linear-gradient(100deg, var(--accent), var(--accent-soft)); color: #fff; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; }
.craft-steps li > i { display: block; margin: 0.5rem 0 1rem; color: var(--blue); font-size: 1.625rem; }
.craft-steps h3 { font-size: 1.0625rem; font-weight: 700; color: var(--navy); }
.craft-steps p { margin-top: 0.5rem; color: var(--muted); font-size: 0.875rem; min-height: 4.2rem; }
.craft-steps em { display: block; margin-top: 0.875rem; padding-top: 0.75rem; border-top: 1px dashed var(--line); color: var(--accent); font-size: 0.75rem; font-style: normal; font-weight: 600; }

/* ---------- cases ---------- */
.cases { background: var(--navy-deep); max-width: none; }
.cases > * { max-width: var(--container); margin-left: auto; margin-right: auto; }
.cases.section { padding-left: 0; padding-right: 0; }
.cases .section-head h2 { color: #fff; }
.cases .section-head > p { color: #93a9c0; }
.case-carousel { padding: 0 2rem; overflow: hidden; }
.case-track { display: flex; transition: transform 0.55s cubic-bezier(0.65, 0, 0.35, 1); }
.case-card { flex: 0 0 100%; padding: 2.5rem; border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-lg); background: linear-gradient(160deg, rgba(22, 57, 94, 0.75), rgba(10, 30, 54, 0.9)); }
.case-tag { display: inline-block; margin-bottom: 1.125rem; padding: 0.25rem 0.75rem; border-radius: 999px; background: rgba(242, 107, 29, 0.15); color: var(--accent-soft); font-size: 0.75rem; font-weight: 700; }
.case-card h3 { color: #fff; font-size: 1.375rem; font-weight: 700; }
.case-card > p { margin-top: 0.875rem; max-width: 46rem; color: #b9c9da; font-size: 1rem; line-height: 1.8; }
.case-results { display: grid; gap: 1rem; margin-top: 2rem; padding-top: 1.75rem; border-top: 1px solid rgba(255, 255, 255, 0.12); grid-template-columns: repeat(3, minmax(0, 10rem)); }
.case-results b { display: block; color: var(--accent-soft); font-size: 1.625rem; font-weight: 800; }
.case-results span { color: #8fa8c4; font-size: 0.8125rem; }
.case-controls { display: flex; align-items: center; justify-content: center; gap: 1.25rem; margin-top: 2rem; }
.case-arrow { display: grid; width: 2.75rem; height: 2.75rem; place-items: center; border: 1px solid rgba(255, 255, 255, 0.25); border-radius: 50%; color: #fff; transition: background 0.2s, border-color 0.2s; }
.case-arrow:hover { background: rgba(255, 255, 255, 0.12); border-color: rgba(255, 255, 255, 0.5); }
.case-dots { display: flex; gap: 0.5rem; }
.case-dots button { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: rgba(255, 255, 255, 0.3); transition: background 0.25s, transform 0.25s; }
.case-dots button.active-mode { background: var(--accent); transform: scale(1.35); }

/* ---------- service ---------- */
.service-grid { display: grid; gap: 3rem; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); align-items: center; }
.service-map { padding: 2rem; border-radius: var(--radius-lg); background: var(--bg-soft); }
.service-map svg { width: 100%; height: auto; }
.region-list { display: grid; gap: 0.625rem; margin-top: 1.5rem; grid-template-columns: repeat(2, 1fr); }
.region-list li { padding: 0.75rem 1rem; border-radius: var(--radius); background: #fff; box-shadow: 0 0.375rem 1rem rgba(14, 42, 71, 0.06); }
.region-list b { display: block; color: var(--navy); font-size: 0.9375rem; }
.region-list span { color: var(--muted); font-size: 0.75rem; }
.service-promises { display: grid; gap: 1.25rem; }
.service-promises article { display: flex; gap: 1.125rem; padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; transition: transform 0.25s, box-shadow 0.25s; }
.service-promises article:hover { transform: translateX(0.375rem); box-shadow: var(--shadow); }
.service-promises i { display: grid; flex: 0 0 3rem; width: 3rem; height: 3rem; place-items: center; border-radius: 0.75rem; background: linear-gradient(135deg, var(--navy), var(--navy-soft)); color: #fff; font-size: 1.25rem; }
.service-promises h3 { font-size: 1.0625rem; font-weight: 700; color: var(--navy); }
.service-promises p { margin-top: 0.375rem; color: var(--muted); font-size: 0.875rem; }

/* ---------- news ---------- */
.news { background: var(--bg-soft); max-width: none; }
.news > * { max-width: var(--container); margin-left: auto; margin-right: auto; }
.news.section { padding-left: 0; padding-right: 0; }
.news-grid { display: grid; gap: 1.5rem; padding: 0 2rem; grid-template-columns: repeat(3, 1fr); }
.news-card { display: flex; gap: 1.25rem; padding: 1.75rem; border-radius: var(--radius-lg); background: #fff; box-shadow: 0 0.5rem 1.5rem rgba(14, 42, 71, 0.06); transition: transform 0.25s, box-shadow 0.25s; }
.news-card:hover { transform: translateY(-0.375rem); box-shadow: var(--shadow); }
.news-date { flex: 0 0 3.5rem; text-align: center; }
.news-date b { display: block; padding: 0.625rem 0; border-radius: var(--radius) var(--radius) 0 0; background: var(--navy); color: #fff; font-size: 0.9375rem; }
.news-date span { display: block; padding: 0.25rem 0; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 var(--radius) var(--radius); color: var(--muted); font-size: 0.6875rem; }
.news-tag { display: inline-block; margin-bottom: 0.5rem; padding: 0.125rem 0.625rem; border-radius: 999px; background: rgba(61, 123, 216, 0.1); color: var(--blue); font-size: 0.6875rem; font-weight: 700; }
.news-body h3 { font-size: 1rem; font-weight: 700; color: var(--navy); line-height: 1.45; }
.news-body > p { margin-top: 0.5rem; color: var(--muted); font-size: 0.8125rem; }
.news-link { display: inline-flex; align-items: center; gap: 0.375rem; margin-top: 0.875rem; padding: 0; color: var(--accent); font-size: 0.8125rem; font-weight: 700; }
.news-link:hover { color: var(--accent-soft); }

/* ---------- contact ---------- */
.contact { background: radial-gradient(50rem 28rem at 85% 0%, rgba(242, 107, 29, 0.14), transparent 60%), linear-gradient(160deg, var(--navy-deep), var(--navy)); }
.contact-inner { display: grid; gap: 4rem; max-width: var(--container); margin: 0 auto; padding: 6rem 2rem; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
.contact-copy .section-kicker { color: var(--accent-soft); }
.contact-copy .section-kicker::before { background: var(--accent-soft); }
.contact-copy h2 { color: #fff; font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; }
.contact-copy > p { margin-top: 1.125rem; max-width: 28rem; color: #b9c9da; font-size: 0.9375rem; line-height: 1.8; }
.contact-facts { display: grid; gap: 1.25rem; margin-top: 2.5rem; }
.contact-facts li { display: flex; align-items: center; gap: 1rem; }
.contact-facts i { display: grid; width: 2.75rem; height: 2.75rem; place-items: center; border: 1px solid rgba(255, 255, 255, 0.16); border-radius: 0.75rem; background: rgba(255, 255, 255, 0.06); color: var(--accent-soft); font-size: 1.125rem; }
.contact-facts b { display: block; color: #fff; font-size: 1.0625rem; }
.contact-facts span { color: #8fa8c4; font-size: 0.75rem; }
.contact-form { padding: 2.25rem; border-radius: var(--radius-lg); background: #fff; box-shadow: 0 2rem 4.5rem rgba(2, 10, 20, 0.35); }
.contact-form h3 { margin-bottom: 1.5rem; color: var(--navy); font-size: 1.25rem; font-weight: 800; }
.contact-form label { display: block; margin-bottom: 1.125rem; color: var(--navy); font-size: 0.875rem; font-weight: 600; }
.contact-form label i { color: var(--accent); font-style: normal; }
.contact-form input, .contact-form select, .contact-form textarea { display: block; width: 100%; margin-top: 0.5rem; padding: 0.75rem 0.875rem; border: 1px solid var(--line); border-radius: 0.5rem; font-family: inherit; font-size: 0.9375rem; color: var(--ink); background: #fff; transition: border-color 0.2s, box-shadow 0.2s; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { outline: 0; border-color: var(--blue); box-shadow: 0 0 0 0.1875rem rgba(61, 123, 216, 0.15); }
.contact-form label.error-mode input, .contact-form label.error-mode select { border-color: #e0483e; box-shadow: 0 0 0 0.1875rem rgba(224, 72, 62, 0.12); }
.field-error { display: none; margin-top: 0.375rem; color: #e0483e; font-size: 0.75rem; font-style: normal; font-weight: 500; }
.contact-form label.error-mode .field-error { display: block; }
.form-row { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; }
.form-submit { width: 100%; justify-content: center; margin-top: 0.375rem; }
.form-submit:disabled { opacity: 0.65; cursor: default; transform: none; }
.form-status { margin-top: 1rem; padding: 0.875rem 1rem; border-radius: 0.5rem; background: rgba(38, 186, 143, 0.1); color: #1d8f6c; font-size: 0.875rem; font-weight: 600; }
.form-status:empty { display: none; }

/* ---------- footer ---------- */
.site-footer { background: #061527; color: #93a9c0; }
.footer-inner { display: grid; gap: 3rem; max-width: var(--container); margin: 0 auto; padding: 4rem 2rem 3rem; grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr; }
.footer-brand .brand { margin-bottom: 1.25rem; }
.footer-brand p { font-size: 0.8125rem; line-height: 1.8; }
.footer-col { display: grid; gap: 0.625rem; align-content: start; font-size: 0.875rem; }
.footer-col b { margin-bottom: 0.5rem; color: #fff; font-size: 0.9375rem; }
.footer-col a:hover { color: var(--accent-soft); }
.footer-contact span { display: block; font-size: 0.8125rem; line-height: 1.7; }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; max-width: var(--container); margin: 0 auto; padding: 1.25rem 2rem; border-top: 1px solid rgba(255, 255, 255, 0.08); font-size: 0.75rem; }

/* ---------- to-top / toast ---------- */
.to-top { position: fixed; right: 1.5rem; bottom: 1.5rem; z-index: 90; display: grid; width: 2.75rem; height: 2.75rem; place-items: center; border-radius: 50%; background: var(--navy); color: #fff; font-size: 1.0625rem; box-shadow: 0 0.75rem 1.75rem rgba(8, 28, 51, 0.35); opacity: 0; pointer-events: none; transform: translateY(0.75rem); transition: opacity 0.25s, transform 0.25s, background 0.2s; }
.to-top.show-mode { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top:hover { background: var(--accent); }
.toast { position: fixed; bottom: 1.5rem; left: 50%; z-index: 110; max-width: min(90vw, 30rem); padding: 0.875rem 1.25rem; border-radius: 0.625rem; background: rgba(8, 28, 51, 0.95); color: #fff; font-size: 0.875rem; box-shadow: 0 1rem 2.5rem rgba(2, 10, 20, 0.4); opacity: 0; pointer-events: none; transform: translate(-50%, 0.75rem); transition: opacity 0.3s, transform 0.3s; }
.toast.show-mode { opacity: 1; transform: translate(-50%, 0); }

/* ---------- reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(1.5rem); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-reveal].reveal-mode { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 1200px) {
  .main-nav { gap: 1.375rem; }
  .hero-panel { width: 18.75rem; }
}

@media (max-width: 992px) {
  .menu-toggle { display: block; }
  .main-nav { position: fixed; top: 4.5rem; right: 0; bottom: 0; z-index: 99; flex-direction: column; align-items: stretch; gap: 0; width: min(20rem, 84vw); padding: 1.5rem; background: var(--navy-deep); box-shadow: -1rem 0 2.5rem rgba(2, 10, 20, 0.4); transform: translateX(100%); transition: transform 0.3s ease; }
  .main-nav.menu-open-mode { transform: translateX(0); }
  .main-nav > a:not(.nav-cta) { padding: 1rem 0.5rem; border-bottom: 1px solid rgba(255, 255, 255, 0.08); font-size: 1.0625rem; }
  .main-nav > a:not(.nav-cta)::after { display: none; }
  .nav-cta { justify-content: center; margin-top: 1.25rem; padding: 0.875rem; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 0.875rem; }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .tab-panel { grid-template-columns: 1fr; padding: 1.75rem; }
  .product-visual { order: -1; }
  .craft-steps { grid-template-columns: repeat(2, 1fr); }
  .craft-steps::before { display: none; }
  .service-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 3rem; }
  .footer-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .hero-slide { min-height: 36rem; }
  .hero-panel { display: none; }
  .hero-arrow { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 4rem 1.25rem; }
  .header-inner { padding: 0 1.25rem; }
  .brand small { display: none; }
  .hero-slide { min-height: 32rem; padding: 7.5rem 1.25rem 6rem; }
  .hero h1 { font-size: clamp(1.75rem, 8vw, 2.25rem); }
  .hero-copy > p { font-size: 0.9375rem; }
  .metrics-inner { grid-template-columns: repeat(2, 1fr); gap: 1.75rem 0; padding: 2.5rem 1.25rem; }
  .metric:nth-child(odd) { border-left: 0; }
  .solution-grid { grid-template-columns: 1fr; }
  .solution-card > p { min-height: 0; }
  .product-tabs, .case-carousel, .news-grid { padding: 0 1.25rem; }
  .tab-list { overflow-x: auto; white-space: nowrap; }
  .tab-panel { padding: 1.5rem 1.25rem; }
  .spec-table { grid-template-columns: 1fr; }
  .craft-steps { grid-template-columns: 1fr; }
  .craft-steps p { min-height: 0; }
  .case-card { padding: 1.75rem 1.25rem; }
  .case-results { grid-template-columns: 1fr; gap: 0.875rem; }
  .region-list { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .contact-inner, .contact-form { padding: 0; }
  .contact-inner { padding: 4rem 1.25rem; }
  .contact-form { padding: 1.75rem 1.25rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; padding: 3rem 1.25rem 2rem; }
  .footer-bottom { flex-direction: column; gap: 0.25rem; padding: 1.25rem; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-track, .case-track { transition: none; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- visual polish ---------- */
:focus-visible { outline: 3px solid rgba(242, 107, 29, 0.75); outline-offset: 3px; }
.site-header { backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid rgba(255,255,255,.08); }
.hero-slide { isolation: isolate; background-size: cover; }
.hero-slide[style*="hero.png"] { background-position: 58% center; }
.hero-copy { animation: machinery-copy-in .8s cubic-bezier(.2,.75,.25,1) both; }
.hero-panel { border-color: rgba(255,255,255,.22); box-shadow: 0 2rem 5rem rgba(2,10,20,.55); }
.solution-card, .news-card, .case-card { transition: transform .35s cubic-bezier(.2,.75,.25,1), box-shadow .35s, border-color .35s; }
.solution-card:hover, .news-card:hover { transform: translateY(-.45rem); }
.product-visual { box-shadow: inset 0 0 0 1px rgba(255,255,255,.08); }
.hero-dots button { cursor: pointer; }
@keyframes machinery-copy-in { from { opacity: 0; transform: translateY(1rem); } to { opacity: 1; transform: none; } }
@media (max-width: 768px) {
  .hero-slide { background-position: 62% center; }
}
@media (prefers-reduced-motion: reduce) { .hero-copy { animation: none; } }