/* ========== 纵昂建设 · 风电主题 ========== */
:root {
  --navy-900: #031a31;
  --navy-800: #06284a;
  --navy-700: #0a3a66;
  --blue-600: #1668b4;
  --blue-500: #1e7fd0;
  --sky-300: #8cc8f0;
  --sky-100: #e8f3fb;
  --green-500: #5bb547;
  --green-400: #7cc96a;
  --teal-400: #2fb7b0;
  --ink: #12263a;
  --muted: #5b6e82;
  --line: #dbe6ef;
  --bg-soft: #f4f8fb;
  --white: #fff;
  --grad-brand: linear-gradient(120deg, var(--green-500), var(--teal-400) 45%, var(--blue-600));
  --radius: 18px;
  --shadow: 0 18px 50px rgba(6, 40, 74, .12);
  --container: 1200px;
  --header-h: 76px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: .02em; }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }
.skip-link { position: absolute; left: -999px; top: 8px; background: #fff; padding: 8px 14px; z-index: 999; border-radius: 8px; }
.skip-link:focus { left: 12px; }
:focus-visible { outline: 3px solid var(--green-400); outline-offset: 3px; }

.eyebrow { font-size: 13px; letter-spacing: .22em; font-weight: 700; color: var(--blue-600); margin-bottom: 14px; display: inline-flex; align-items: center; gap: 10px; }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--grad-brand); }
.eyebrow.light { color: var(--sky-300); }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 50px; padding: 0 28px; border-radius: 999px; font-weight: 600; transition: transform .25s, box-shadow .25s, background .25s; border: 1px solid transparent; }
.button.primary { background: var(--grad-brand); color: #fff; box-shadow: 0 10px 30px rgba(30, 127, 208, .35); }
.button.primary:hover { transform: translateY(-2px); box-shadow: 0 16px 36px rgba(30, 127, 208, .45); }
.button.ghost { border-color: rgba(255,255,255,.55); color: #fff; backdrop-filter: blur(6px); background: rgba(255,255,255,.06); }
.button.ghost:hover { background: rgba(255,255,255,.16); }

.section { padding: 110px 0; position: relative; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; margin-bottom: 52px; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 42px); }
.section-head > p { max-width: 420px; color: var(--muted); margin: 0; }

/* reveal */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s ease, transform .8s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ========== header ========== */
.site-header { position: fixed; inset: 0 0 auto; z-index: 100; height: var(--header-h); transition: background .3s, box-shadow .3s; }
.site-header.scrolled { background: rgba(255,255,255,.94); backdrop-filter: blur(12px); box-shadow: 0 4px 24px rgba(6,40,74,.08); }
.nav-wrap { height: 100%; width: min(1320px, 100% - 48px); margin-inline: auto; display: flex; align-items: center; gap: 20px; }
.brand { position: relative; height: 44px; flex: none; }
.brand img { height: 44px; width: auto; transition: opacity .3s; }
.brand .logo-color { position: absolute; inset: 0; opacity: 0; }
.scrolled .brand .logo-white { opacity: 0; }
.scrolled .brand .logo-color { opacity: 1; }
#main-nav { display: flex; gap: 4px; margin-left: auto; }
#main-nav a { color: rgba(255,255,255,.9); padding: 8px 14px; border-radius: 999px; font-size: 15px; position: relative; transition: color .2s, background .2s; }
@media (min-width: 1241px) {
  .lang-en .nav-wrap { width: min(1500px, 100% - 32px); gap: 12px; }
  .lang-en #main-nav { gap: 0; }
  .lang-en #main-nav a { padding-inline: 6px; font-size: clamp(12px, .9vw, 14px); white-space: nowrap; }
  .lang-en .digital-cta { width: 146px; }
  .lang-en .nav-cta { font-size: 13px; }
}
#main-nav a:hover, #main-nav a.active { background: rgba(255,255,255,.14); color: #fff; }
.scrolled #main-nav a { color: var(--ink); }
.scrolled #main-nav a:hover, .scrolled #main-nav a.active { background: var(--sky-100); color: var(--blue-600); }
.nav-cta { position: relative; padding: 9px 4px; color: #fff; background: transparent; font-weight: 600; font-size: 15px; flex: none; }
.nav-cta::after { content: ""; position: absolute; left: 4px; right: 4px; bottom: 4px; height: 1px; background: linear-gradient(90deg, transparent, var(--green-400), transparent); transform: scaleX(0); transition: transform .25s; }
.nav-cta:hover::after { transform: scaleX(1); }
.scrolled .nav-cta { color: var(--ink); }
.lang-switch { display: inline-flex; align-items: center; gap: 5px; flex: none; color: rgba(255,255,255,.48); font-size: 12px; }
.lang-switch button { position: relative; min-width: 25px; padding: 5px 2px; border: 0; color: rgba(255,255,255,.62); background: transparent; font-size: 12px; font-weight: 700; transition: color .2s, text-shadow .2s; }
.lang-switch button[aria-pressed="true"] { color: #fff; text-shadow: 0 0 8px rgba(91,231,255,.75); }
.lang-switch button[aria-pressed="true"]::after { content: ""; position: absolute; left: 50%; bottom: 1px; width: 3px; height: 3px; border-radius: 50%; background: var(--green-400); box-shadow: 0 0 6px var(--green-400); transform: translateX(-50%); }
.scrolled .lang-switch { color: var(--line); }
.scrolled .lang-switch button { color: var(--muted); }
.scrolled .lang-switch button[aria-pressed="true"] { color: var(--navy-800); text-shadow: none; }
.digital-cta { position: relative; isolation: isolate; overflow: hidden; display: inline-flex; align-items: center; justify-content: center; gap: 8px; width: 146px; height: 44px; flex: none; padding: 0 14px 0 18px; border: 0; border-radius: 999px; color: #e9fdff; background: transparent; box-shadow: none; transition: transform .25s, filter .25s; }
.digital-cta::before { content: ""; position: absolute; z-index: -1; inset: 0; background: linear-gradient(100deg, transparent 12%, rgba(91,231,255,.2) 42%, rgba(124,255,178,.25) 55%, transparent 84%); transform: translateX(-110%) skewX(-18deg); animation: digitalBreeze 4s ease-in-out infinite; }
.digital-cta:hover { transform: translateY(-2px); filter: brightness(1.16) drop-shadow(0 0 7px rgba(91,231,255,.34)); }
.digital-bits { position: absolute; z-index: -1; inset: 3px 8px; display: grid; align-content: center; gap: 2px; overflow: hidden; opacity: .42; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.digital-bits i { color: #c4faff; font: 600 8px/1 monospace; font-style: normal; letter-spacing: .18em; white-space: nowrap; text-shadow: 0 0 5px rgba(91,231,255,.9); animation: digitalBits 6s linear infinite; }
.digital-bits i:nth-child(2) { color: #c5ffd6; animation-direction: reverse; animation-duration: 7.5s; }
.digital-bits i:nth-child(3) { animation-delay: -3s; animation-duration: 5.2s; }
.digital-label { position: relative; z-index: 1; display: flex; align-items: center; gap: .08em; }
.digital-label b { color: #fff; font-size: 16px; line-height: 1; letter-spacing: .04em; text-shadow: 0 0 8px rgba(91,231,255,.8); animation: windText 2.8s ease-in-out infinite; animation-delay: calc(var(--i, 0) * -.28s); }
.lang-en .digital-cta { width: 158px; }
.lang-en .digital-label { gap: .02em; }
.lang-en .digital-label b { font-size: 11px; letter-spacing: .03em; }
.digital-arrow { position: relative; z-index: 1; color: #9affba; font-size: 21px; line-height: 1; animation: digitalArrow 1.5s ease-in-out infinite; }
.scrolled .digital-cta { background: transparent; }
.scrolled .digital-label b { color: var(--navy-800); text-shadow: 0 0 7px rgba(30,127,208,.38); }
.scrolled .digital-arrow { color: var(--blue-600); }
.scrolled .digital-bits { opacity: .54; }
@keyframes digitalBreeze { 0%, 28% { transform: translateX(-110%) skewX(-18deg); } 72%, 100% { transform: translateX(110%) skewX(-18deg); } }
@keyframes digitalBits { from { transform: translateX(-18%); } to { transform: translateX(8%); } }
@keyframes windText { 0%, 100% { transform: translate3d(0,0,0) skewX(-2deg); } 35% { transform: translate3d(1px,-2px,0) skewX(2deg); } 70% { transform: translate3d(-1px,1px,0) skewX(-1deg); } }
@keyframes digitalArrow { 50% { transform: translateX(3px); text-shadow: 0 0 8px #7cffb2; } }
.menu-button { display: none; background: none; border: 0; width: 44px; height: 44px; padding: 10px; flex-direction: column; justify-content: center; gap: 5px; }
.menu-button span { display: block; height: 2px; background: #fff; border-radius: 2px; transition: transform .3s, opacity .3s; }
.scrolled .menu-button span { background: var(--ink); }
.menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== hero ========== */
.hero { position: relative; min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; color: #fff; overflow: hidden; padding: calc(var(--header-h) + 40px) 0 40px; }
.hero-bg { position: absolute; inset: -4%; background: url("assets/img/hero-sea.jpg") center/cover no-repeat; animation: slowZoom 28s ease-in-out infinite alternate; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(3,26,49,.88) 0%, rgba(6,40,74,.55) 45%, rgba(6,40,74,.1) 100%), linear-gradient(0deg, rgba(3,26,49,.85), transparent 45%); }
@keyframes slowZoom { to { transform: scale(1.08) translateX(-1.5%); } }
.hero-content { position: relative; z-index: 2; }
.hero h1 { font-size: clamp(38px, 6vw, 76px); font-weight: 800; letter-spacing: .04em; }
.hero h1 span { display: inline-block; margin-top: 8px; font-size: .58em; font-weight: 600; background: linear-gradient(90deg, #bfe7ff, #9be08b); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy { max-width: 600px; font-size: clamp(16px, 1.4vw, 19px); color: rgba(255,255,255,.85); margin: 26px 0 36px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { position: relative; z-index: 2; margin-top: clamp(50px, 9vh, 110px); display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.2); }
.hero-stats > div { padding: 24px 24px 0 0; }
.hero-stats > div + div { padding-left: 24px; border-left: 1px solid rgba(255,255,255,.14); }
.hero-stats strong { font-size: clamp(30px, 3.4vw, 46px); font-weight: 800; font-variant-numeric: tabular-nums; }
.hero-stats em { font-style: normal; font-size: 18px; margin-left: 4px; color: var(--green-400); font-weight: 700; }
.hero-stats p { margin: 4px 0 0; color: rgba(255,255,255,.7); font-size: 14px; }
.scroll-cue { position: absolute; left: 50%; bottom: 22px; width: 26px; height: 42px; border: 2px solid rgba(255,255,255,.5); border-radius: 20px; transform: translateX(-50%); z-index: 2; }
.scroll-cue span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; background: #fff; border-radius: 2px; animation: cue 1.8s infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 40% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

/* ========== about ========== */
.about { background: linear-gradient(180deg, var(--bg-soft), #fff); overflow: hidden; }
.about::after { content: ""; position: absolute; right: -120px; top: 60px; width: 420px; height: 420px; background: url("assets/img/logo-color.png") left center/auto 100% no-repeat; opacity: .04; pointer-events: none; }
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 70px; align-items: center; }
.about h2 { font-size: clamp(30px, 3.6vw, 44px); margin-bottom: 18px; }
.lead { font-size: 20px; font-weight: 600; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.about-copy > p:not(.lead):not(.eyebrow) { color: var(--muted); }
.branch-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.branch-list li { display: flex; flex-direction: column; padding: 10px 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff; min-width: 96px; }
.branch-list b { color: var(--navy-800); }
.branch-list span { font-size: 13px; color: var(--muted); }
.about-visual { position: relative; padding: 0 0 70px 40px; }
.about-main { border-radius: var(--radius); box-shadow: var(--shadow); aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.about-sub { position: absolute; left: 0; bottom: 0; width: 48%; aspect-ratio: 16/10; object-fit: cover; border-radius: 14px; border: 6px solid #fff; box-shadow: var(--shadow); }
.float-card { position: absolute; right: -10px; bottom: 30px; background: var(--navy-800); color: #fff; padding: 20px 26px; border-radius: 16px; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.float-card strong { font-size: 34px; background: linear-gradient(90deg, #bfe7ff, #9be08b); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1.1; }
.float-card span { font-size: 14px; color: rgba(255,255,255,.75); }

/* ========== quals ========== */
.cert-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.cert { margin: 0; text-align: center; }
.cert button { width: 100%; aspect-ratio: 3/4; padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: linear-gradient(180deg, #fff, var(--bg-soft)); display: grid; place-items: center; transition: transform .3s, box-shadow .3s, border-color .3s; }
.cert button:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--sky-300); }
.cert img { max-height: 100%; object-fit: contain; }
.cert figcaption { margin-top: 12px; font-size: 14px; font-weight: 600; color: var(--navy-800); }

/* ========== org ========== */
.org { background: var(--bg-soft); }
.org-chart { background: #fff; border-radius: var(--radius); padding: 44px; box-shadow: 0 6px 30px rgba(6,40,74,.06); }
.org-top { margin: 0 auto 44px; width: max-content; text-align: center; padding: 16px 40px; border-radius: 14px; background: var(--grad-brand); color: #fff; position: relative; }
.org-top span { display: block; font-size: 20px; font-weight: 700; }
.org-top small { opacity: .85; }
.org-top::after { content: ""; position: absolute; left: 50%; top: 100%; width: 2px; height: 22px; background: var(--sky-300); }
.org-cols { display: grid; grid-template-columns: repeat(7, 1fr); gap: 14px; position: relative; padding-top: 22px; border-top: 2px solid var(--sky-300); }
.org-col { position: relative; border: 1px solid var(--line); border-radius: 12px; padding: 16px 12px; text-align: center; background: var(--bg-soft); }
.org-col::before { content: ""; position: absolute; left: 50%; top: -24px; width: 2px; height: 22px; background: var(--sky-300); }
.org-col h3 { font-size: 16px; color: var(--navy-800); }
.org-col small { display: block; font-size: 12px; color: var(--muted); margin-top: 4px; }
.org-col ul { margin-top: 12px; display: grid; gap: 6px; }
.org-col li { font-size: 13px; padding: 4px 6px; background: #fff; border-radius: 6px; border: 1px dashed var(--line); }
.org-subs { margin-top: 30px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.org-subs span { padding: 8px 16px; border-radius: 999px; background: var(--navy-800); color: #fff; font-size: 14px; }

/* ========== chapter banner ========== */
.chapter { position: relative; padding: 150px 0; color: #fff; background: var(--bg) center/cover no-repeat fixed; isolation: isolate; }
.chapter::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(3,26,49,.9), rgba(6,40,74,.45)); }
.chapter h2 { font-size: clamp(36px, 5vw, 60px); font-weight: 800; margin-bottom: 14px; }
.chapter p:last-child { font-size: clamp(16px, 1.6vw, 21px); color: rgba(255,255,255,.85); margin: 0; }

/* ========== lifecycle ========== */
.stage-tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; margin-bottom: 30px; border-bottom: 2px solid var(--line); }
.stage-tabs button { background: none; border: 0; padding: 18px 10px; font-size: 17px; font-weight: 600; color: var(--muted); position: relative; display: flex; align-items: center; justify-content: center; gap: 10px; }
.stage-tabs button i { font-style: normal; font-size: 13px; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--line); }
.stage-tabs button::after { content: ""; position: absolute; left: 10%; right: 10%; bottom: -2px; height: 3px; background: var(--grad-brand); transform: scaleX(0); transition: transform .35s; }
.stage-tabs button[aria-selected="true"] { color: var(--navy-800); }
.stage-tabs button[aria-selected="true"] i { background: var(--grad-brand); color: #fff; border-color: transparent; }
.stage-tabs button[aria-selected="true"]::after { transform: scaleX(1); }
.stage-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; background: var(--bg-soft); border-radius: var(--radius); padding: 44px; animation: fadeIn .5s ease; }
.stage-panel[hidden] { display: none; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.stage-text h3 { font-size: 28px; margin-bottom: 8px; color: var(--navy-800); }
.stage-text > p { color: var(--muted); }
.stage-text ul { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
.stage-text li { padding: 12px 14px 12px 36px; background: #fff; border-radius: 10px; position: relative; font-size: 15px; box-shadow: 0 2px 10px rgba(6,40,74,.04); }
.stage-text li::before { content: ""; position: absolute; left: 14px; top: 19px; width: 10px; height: 10px; border-radius: 50%; background: var(--grad-brand); }
.stage-panel img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 14px; }

/* ========== value ========== */
.value { background: radial-gradient(circle at 80% 20%, rgba(47,183,176,.25), transparent 45%), linear-gradient(135deg, var(--navy-900), var(--navy-700)); color: #fff; overflow: hidden; }
.value-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 60px; align-items: center; }
.value h2 { font-size: clamp(30px, 3.4vw, 42px); margin-bottom: 24px; }
.value-copy p:not(.eyebrow) { color: rgba(255,255,255,.78); }
.value-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.value-cards article { padding: 28px; border-radius: var(--radius); background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); backdrop-filter: blur(6px); transition: transform .3s, background .3s; }
.value-cards article:hover { transform: translateY(-6px); background: rgba(255,255,255,.1); }
.vi { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; background: var(--grad-brand); font-size: 22px; margin-bottom: 18px; }
.value-cards h3 { font-size: 19px; margin-bottom: 12px; }
.value-cards li { color: rgba(255,255,255,.78); font-size: 15px; padding-left: 16px; position: relative; }
.value-cards li::before { content: ""; position: absolute; left: 0; top: 11px; width: 6px; height: 6px; border-radius: 50%; background: var(--green-400); }

/* ========== O&M ========== */
.om-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; grid-template-rows: auto auto; gap: 18px; }
.om-photo { margin: 0; position: relative; border-radius: var(--radius); overflow: hidden; }
.om-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s; min-height: 220px; }
.om-photo:hover img { transform: scale(1.05); }
.om-photo figcaption { position: absolute; left: 16px; bottom: 14px; color: #fff; font-weight: 600; padding: 4px 14px; border-radius: 999px; background: rgba(3,26,49,.6); backdrop-filter: blur(4px); font-size: 14px; }
.om-photo.big { grid-row: span 2; }
.om-points { grid-column: span 2; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.om-points li { display: flex; gap: 14px; align-items: center; padding: 20px; border-radius: 14px; background: var(--bg-soft); font-weight: 600; color: var(--navy-800); }
.om-points b { font-size: 26px; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.system-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
.system-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 34px; background: #fff; }
.system-card h3 { font-size: 22px; color: var(--navy-800); margin-bottom: 8px; }
.system-note { color: var(--muted); font-size: 14px; }
.mini-org { display: grid; gap: 14px; justify-items: center; margin: 22px 0; }
.mini-org span, .mo-top { display: inline-block; text-align: center; padding: 8px 16px; border-radius: 10px; background: var(--sky-100); color: var(--navy-800); font-weight: 600; font-size: 14px; line-height: 1.4; }
.mo-top { background: var(--grad-brand); color: #fff; padding: 10px 26px; }
.mini-org small { font-weight: 400; color: var(--muted); font-size: 12px; }
.mo-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.mo-row.small span { font-size: 13px; padding: 6px 12px; background: var(--bg-soft); border: 1px dashed var(--line); font-weight: 500; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.chip-row span { font-size: 13px; padding: 5px 12px; border-radius: 999px; border: 1px solid var(--sky-300); color: var(--blue-600); }
.safety-list { margin: 20px 0 0; display: grid; gap: 12px; }
.safety-list div { display: grid; grid-template-columns: 120px 1fr; gap: 14px; padding: 14px 16px; border-radius: 12px; background: var(--bg-soft); border-left: 4px solid var(--green-500); }
.safety-list dt { font-weight: 700; color: var(--navy-800); }
.safety-list dd { margin: 0; color: var(--muted); font-size: 15px; }

/* ========== turbine O&M ========== */
.turbine { background: var(--bg-soft); }
.turbine-layout { display: grid; grid-template-columns: 380px 1fr; gap: 30px; align-items: start; }
.turbine-photos { display: grid; gap: 18px; position: sticky; top: calc(var(--header-h) + 20px); }
.turbine-photos img { border-radius: var(--radius); aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.sys-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; }
.sys { background: #fff; border-radius: var(--radius); padding: 26px; border-top: 4px solid transparent; border-image: var(--grad-brand) 1; border-image-slice: 1 0 0 0; box-shadow: 0 4px 20px rgba(6,40,74,.05); transition: transform .3s, box-shadow .3s; }
.sys:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.sys h3 { font-size: 19px; color: var(--navy-800); margin-bottom: 14px; }
.sys li { font-size: 14px; color: var(--muted); padding: 7px 0 7px 18px; border-bottom: 1px dashed var(--line); position: relative; }
.sys li:last-child { border-bottom: 0; }
.sys li::before { content: "›"; position: absolute; left: 2px; color: var(--green-500); font-weight: 700; }

/* ========== major ========== */
.major { background: linear-gradient(135deg, var(--navy-800), var(--navy-900)); color: #fff; overflow: hidden; }
.major-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: center; }
.major h2 { font-size: clamp(30px, 3.4vw, 42px); margin-bottom: 30px; }
.major-point { padding: 22px 0 22px 24px; border-left: 2px solid rgba(255,255,255,.15); position: relative; }
.major-point::before { content: ""; position: absolute; left: -7px; top: 28px; width: 12px; height: 12px; border-radius: 50%; background: var(--green-400); box-shadow: 0 0 0 5px rgba(124,201,106,.2); }
.major-point h3 { font-size: 20px; margin-bottom: 8px; }
.major-point p { color: rgba(255,255,255,.75); margin: 0; }
.major-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.major-tags span { padding: 6px 16px; border-radius: 999px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.18); font-size: 14px; }
.major-photos { display: grid; grid-template-columns: 1.2fr 1fr; grid-template-rows: 1fr 1fr; gap: 16px; height: 520px; }
.major-photos img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius); }
.major-photos img:first-child { grid-row: span 2; }

/* ========== innovation ========== */
.inno-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.inno { display: grid; grid-template-columns: 42% 1fr; border-radius: var(--radius); overflow: hidden; background: #fff; border: 1px solid var(--line); transition: box-shadow .3s, transform .3s; }
.inno:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.inno img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }
.inno-body { padding: 28px; }
.inno-num { font-size: 40px; font-weight: 800; line-height: 1; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 12px; }
.inno-num small { font-size: 20px; }
.inno h3 { font-size: 19px; color: var(--navy-800); margin-bottom: 10px; }
.inno p { font-size: 14px; color: var(--muted); margin: 0; }

/* ========== spares ========== */
.spares { background: linear-gradient(180deg, #fff, var(--sky-100)); }
.spares-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 60px; align-items: center; }
.spares h2 { font-size: clamp(30px, 3.4vw, 42px); margin-bottom: 20px; }
.spares-copy > p:not(.eyebrow) { color: var(--muted); }
.spares-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 28px; }
.spares-stats div { background: #fff; border-radius: 14px; padding: 20px; box-shadow: 0 4px 18px rgba(6,40,74,.06); }
.spares-stats strong { display: block; font-size: 32px; color: var(--navy-800); line-height: 1.1; }
.spares-stats em { font-style: normal; color: var(--green-500); font-size: 20px; }
.spares-stats span { font-size: 14px; color: var(--muted); }
.map-wrap { position: relative; }
.map-wrap img { width: 100%; filter: drop-shadow(0 20px 40px rgba(22,104,180,.18)); }
.pin { position: absolute; transform: translate(-50%, -100%); white-space: nowrap; font-size: 13px; font-weight: 600; background: #fff; color: var(--navy-800); padding: 4px 10px; border-radius: 8px; box-shadow: 0 6px 16px rgba(6,40,74,.18); }
.pin i { position: absolute; left: 50%; top: calc(100% + 4px); width: 12px; height: 12px; margin-left: -6px; border-radius: 50%; background: var(--green-500); }
.pin i::after { content: ""; position: absolute; inset: -6px; border-radius: 50%; border: 2px solid var(--green-500); animation: ping 2s infinite; }
.pin.center { background: var(--navy-800); color: #fff; }
.pin.center i { background: var(--blue-500); }
.pin.center i::after { border-color: var(--blue-500); }
@keyframes ping { from { transform: scale(.5); opacity: 1; } to { transform: scale(2); opacity: 0; } }

/* ========== history timeline ========== */
.history { background: radial-gradient(circle at 15% 0%, rgba(91,181,71,.18), transparent 40%), linear-gradient(160deg, var(--navy-900), var(--navy-800) 60%, #0b4a7d); color: #fff; overflow: hidden; }
.history .section-head > p { color: rgba(255,255,255,.7); }
.history h2 { color: #fff; }
.year-nav { display: flex; flex-wrap: wrap; gap: 8px; margin: -20px 0 30px; }
.year-nav button { background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.2); color: #fff; padding: 6px 18px; border-radius: 999px; font-weight: 600; transition: background .25s; }
.year-nav button:hover, .year-nav button.active { background: var(--grad-brand); border-color: transparent; }
.timeline-wrap { position: relative; }
.timeline { list-style: none; margin: 0; padding: 0 max(24px, calc((100vw - var(--container)) / 2)) 30px; display: flex; overflow-x: auto; scroll-snap-type: x proximity; scroll-behavior: smooth; scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.3) transparent; position: relative; }
.timeline::-webkit-scrollbar { height: 6px; }
.timeline::-webkit-scrollbar-thumb { background: rgba(255,255,255,.25); border-radius: 3px; }
.timeline li { flex: 0 0 230px; height: 450px; position: relative; scroll-snap-align: start; }
/* axis */
.timeline li::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 3px; margin-top: -1.5px; background: linear-gradient(90deg, rgba(140,200,240,.7), rgba(124,201,106,.7)); }
.timeline li:first-child::before { left: 30px; }
/* node */
.timeline li::after { content: ""; position: absolute; left: 30px; top: 50%; width: 16px; height: 16px; margin: -8px 0 0 -8px; border-radius: 50%; background: var(--navy-900); border: 3px solid var(--green-400); box-shadow: 0 0 0 6px rgba(124,201,106,.18); transition: transform .3s; }
.timeline li:hover::after, .timeline li.hl::after { transform: scale(1.35); background: var(--green-400); }
.timeline time { position: absolute; left: 30px; font-size: 34px; font-weight: 800; letter-spacing: .03em; background: linear-gradient(90deg, #fff, #bfe7ff); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1; }
.tl-card { position: absolute; left: 30px; width: 200px; padding: 16px 18px; background: rgba(255,255,255,.96); color: var(--ink); border-radius: 12px; box-shadow: 0 12px 30px rgba(0,0,0,.25); transition: transform .3s; }
.tl-card::before { content: ""; position: absolute; left: -1px; width: 3px; background: var(--grad-brand); }
.tl-card h3 { font-size: 17px; color: var(--navy-800); margin-bottom: 6px; }
.tl-card p { font-size: 13px; color: var(--muted); margin: 0; line-height: 1.6; }
.timeline li:hover .tl-card, .timeline li.hl .tl-card { transform: translateY(-4px); }
/* odd: above axis; even: below axis (like the wall) */
.timeline li:nth-child(odd) time { bottom: calc(50% + 150px); }
.timeline li:nth-child(odd) .tl-card { bottom: calc(50% + 26px); }
.timeline li:nth-child(odd) .tl-card::before { top: 100%; height: 26px; left: 0; }
.timeline li:nth-child(even) time { top: calc(50% + 150px); }
.timeline li:nth-child(even) .tl-card { top: calc(50% + 26px); }
.timeline li:nth-child(even) .tl-card::before { bottom: 100%; height: 26px; left: 0; }
.tl-arrow { position: absolute; top: 50%; z-index: 3; width: 48px; height: 48px; margin-top: -39px; border-radius: 50%; border: 1px solid rgba(255,255,255,.3); background: rgba(3,26,49,.7); color: #fff; font-size: 28px; line-height: 1; backdrop-filter: blur(6px); transition: background .25s; }
.tl-arrow:hover { background: var(--blue-600); }
.tl-arrow.prev { left: 16px; }
.tl-arrow.next { right: 16px; }

/* ========== projects ========== */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.filters button { border: 1px solid var(--line); background: #fff; padding: 8px 20px; border-radius: 999px; color: var(--muted); font-weight: 600; transition: all .25s; }
.filters button:hover { border-color: var(--blue-500); color: var(--blue-600); }
.filters button.active { background: var(--navy-800); color: #fff; border-color: var(--navy-800); }
.project-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project { padding: 26px; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid transparent; display: flex; flex-direction: column; transition: border-color .3s, transform .3s, box-shadow .3s, background .3s; }
.project:hover { background: #fff; border-color: var(--sky-300); transform: translateY(-4px); box-shadow: var(--shadow); }
.project[hidden] { display: none; }
.p-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.p-tags span { font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 6px; background: var(--sky-100); color: var(--blue-600); }
.p-tags span:nth-child(2) { background: rgba(91,181,71,.14); color: #3d8a2e; }
.project h3 { font-size: 17px; line-height: 1.5; color: var(--navy-800); flex: 1; }
.project p { margin: 18px 0 0; display: flex; justify-content: space-between; font-size: 14px; color: var(--muted); padding-top: 14px; border-top: 1px solid var(--line); }
.project p b { color: var(--ink); }
.project p span::before { content: "⌖ "; color: var(--green-500); }

/* ========== partners ========== */
.partners { background: var(--bg-soft); padding-bottom: 90px; }
.marquee { overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track { display: flex; gap: 22px; width: max-content; animation: marquee 45s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track img { height: 96px; width: 200px; object-fit: contain; padding: 18px 24px; background: #fff; border-radius: 14px; border: 1px solid var(--line); }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ========== contact & footer ========== */
.contact { position: relative; padding: 120px 0; color: #fff; background: url("assets/img/tower-closeup.jpg") center/cover no-repeat; isolation: isolate; }
.contact::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(100deg, rgba(3,26,49,.92), rgba(10,58,102,.7)); }
.contact-box { display: flex; justify-content: space-between; align-items: center; gap: 40px; }
.contact h2 { font-size: clamp(28px, 3.4vw, 42px); margin-bottom: 14px; }
.contact-box p:not(.eyebrow) { color: rgba(255,255,255,.8); margin: 0; }
.contact-actions { display: flex; gap: 14px; flex-wrap: wrap; flex: none; }
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.7); padding: 60px 0 24px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-logo { height: 46px; width: auto; margin-bottom: 16px; }
.footer-grid p { color: #fff; font-weight: 600; }
.footer-grid p span { color: rgba(255,255,255,.6); font-weight: 400; }
.site-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; align-content: start; }
.site-footer nav a:hover { color: #fff; }
.footer-branches { display: grid; gap: 6px; align-content: start; }
.footer-branches b { color: #fff; }
.copyright { padding-top: 22px; text-align: center; color: rgba(255,255,255,.45); }

/* lightbox */
.lightbox { position: fixed; inset: 0; z-index: 200; background: rgba(3,26,49,.9); display: grid; place-items: center; padding: 40px; }
.lightbox[hidden] { display: none; }
.lightbox img { max-height: 88vh; max-width: 92vw; border-radius: 10px; box-shadow: 0 30px 80px rgba(0,0,0,.5); background: #fff; }
.lb-close { position: absolute; top: 20px; right: 24px; width: 46px; height: 46px; border-radius: 50%; border: 0; background: rgba(255,255,255,.15); color: #fff; font-size: 28px; }

/* ========== responsive ========== */
@media (max-width: 1180px) {
  #main-nav a { padding: 8px 10px; font-size: 14px; }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .org-cols { grid-template-columns: repeat(4, 1fr); border-top: 0; }
  .org-col::before { display: none; }
  .org-top::after { display: none; }
}
@media (max-width: 1240px) {
  :root { --header-h: 66px; }
  .nav-wrap { gap: 14px; }
  .menu-button { display: flex; margin-left: auto; }
  .nav-cta { display: none; }
  .digital-cta { width: 142px; height: 42px; }
  #main-nav { position: fixed; top: var(--header-h); left: 0; right: 0; flex-direction: column; gap: 0; padding: 12px 20px 24px; background: rgba(255,255,255,.98); box-shadow: 0 20px 40px rgba(6,40,74,.15); transform: translateY(-12px); opacity: 0; pointer-events: none; transition: all .3s; }
  #main-nav.open { transform: none; opacity: 1; pointer-events: auto; }
  #main-nav a { color: var(--ink); padding: 14px 8px; border-radius: 0; border-bottom: 1px solid var(--line); font-size: 16px; }
  .site-header:has(#main-nav.open) { background: #fff; }
  .site-header:has(#main-nav.open) .logo-white { opacity: 0; }
  .site-header:has(#main-nav.open) .logo-color { opacity: 1; }
  .site-header:has(#main-nav.open) .menu-button span { background: var(--ink); }
  .section { padding: 80px 0; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 14px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stats > div:nth-child(3) { border-left: 0; padding-left: 0; }
  .about-grid, .value-grid, .major-grid, .spares-grid, .stage-panel, .system-grid, .turbine-layout, .inno-grid { grid-template-columns: 1fr; }
  .stage-panel { padding: 28px; gap: 28px; }
  .turbine-photos { position: static; grid-template-columns: 1fr 1fr; }
  .om-grid { grid-template-columns: 1fr 1fr; }
  .om-photo.big { grid-row: auto; grid-column: span 2; }
  .project-list { grid-template-columns: 1fr 1fr; }
  .chapter { background-attachment: scroll; padding: 110px 0; }
  .contact-box { flex-direction: column; align-items: flex-start; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: span 2; }
}
@media (max-width: 640px) {
  .container { width: calc(100% - 36px); }
  .nav-wrap { width: calc(100% - 20px); gap: 6px; }
  .brand, .brand img { height: 28px; }
  .menu-button { width: 36px; height: 40px; padding: 8px; }
  .lang-switch { gap: 2px; font-size: 11px; }
  .lang-switch button { min-width: 20px; font-size: 11px; }
  .digital-cta, .lang-en .digital-cta { width: 94px; height: 38px; gap: 4px; padding: 0 8px 0 10px; }
  .digital-label b { font-size: 13px; }
  .lang-en .digital-label b { font-size: 7px; letter-spacing: 0; }
  .digital-arrow { display: none; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .org-chart { padding: 24px; }
  .org-cols { grid-template-columns: 1fr 1fr; }
  .stage-tabs { grid-template-columns: 1fr 1fr; }
  .stage-tabs button { font-size: 15px; }
  .stage-text ul { grid-template-columns: 1fr; }
  .value-cards, .om-points, .project-list { grid-template-columns: 1fr; }
  .om-points { grid-column: span 2; }
  .inno { grid-template-columns: 1fr; }
  .inno img { min-height: 0; aspect-ratio: 16/9; }
  .major-photos { height: 380px; }
  .spares-stats { grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
  .spares-stats div { padding: 14px 10px; }
  .spares-stats strong { font-size: 24px; }
  .pin { font-size: 11px; padding: 3px 7px; }
  .safety-list div { grid-template-columns: 1fr; gap: 2px; }
  .about-visual { padding-left: 0; }
  .float-card { right: 0; }
  .tl-arrow { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid > div:first-child { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}