:root{
  --navy:#0a2a43; --blue:#0e5a8a; --teal:#12a3a8; --aqua:#5fd3d0;
  --bg:#ffffff; --alt:#f2f7fa; --text:#1b2b38; --muted:#5b6e7c; --line:#dce6ec;
  --radius:14px; --shadow:0 8px 28px rgba(10,42,67,.08);
  --font:"Inter","Noto Sans TC","Noto Sans Khmer",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
html[lang="km"] body{line-height:1.9}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1160px,100% - 32px);margin-inline:auto}
.center{text-align:center}
.muted{color:var(--muted)}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto;min-width:0}
.brand-logo{height:42px;width:auto}
.brand-mark{width:42px;height:42px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--teal));color:#fff;font-weight:800;font-size:14px;place-items:center;letter-spacing:.5px}
.brand-text{display:flex;flex-direction:column;line-height:1.2;white-space:nowrap;min-width:0;overflow:hidden;text-overflow:ellipsis}
.brand-text strong{font-size:15px;color:var(--navy)}
.brand-text small{font-size:12px;color:var(--muted)}
.nav{display:flex;gap:26px}
.nav a{font-weight:500;font-size:15px;color:var(--navy);position:relative;white-space:nowrap}
.nav a:hover{color:var(--teal)}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden}
.lang-switch button{white-space:nowrap;border:0;background:none;padding:6px 11px;font:500 13px var(--font);color:var(--muted);cursor:pointer}
.lang-switch button.active{background:var(--navy);color:#fff}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:50%;width:40px;height:40px;flex:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;padding:0}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--navy);border-radius:2px;transition:transform .25s,opacity .2s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-backdrop{display:none}

/* hero：参考名片 —— 上层白色空气，水面波浪下是浅蓝色的水，水里有泡泡 */
.hero{position:relative;color:var(--navy);overflow:hidden;isolation:isolate;
  background:linear-gradient(180deg,#fff 0 180px,#8ccdee 180px,#a9dcf4 38%,#cdeaf8 70%,#e8f5fc 100%)}
.hero-bg{position:absolute;inset:0;z-index:-1;pointer-events:none}
.surface{position:absolute;left:0;width:200%;height:120px}
.surface svg{width:100%;height:100%;display:block;overflow:visible}
.surface.s1{top:70px;animation:drift 24s linear infinite}
.surface.s1 .fill{fill:#8ccdee}
.surface.s1 .line{fill:none;stroke:#fff;stroke-width:3;opacity:.9}
.surface.s2{top:56px;opacity:.75;animation:drift 36s linear infinite reverse}
.surface.s2 .fill{fill:#4fa9dc}
.surface.s2 .line{display:none}
@keyframes drift{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.rays{position:absolute;inset:150px 0 0 0;-webkit-mask-image:linear-gradient(transparent,#000 120px);mask-image:linear-gradient(transparent,#000 120px);background:
  linear-gradient(105deg,transparent 30%,rgba(255,255,255,.22) 34%,transparent 40%),
  linear-gradient(115deg,transparent 55%,rgba(255,255,255,.18) 58%,transparent 64%),
  linear-gradient(98deg,transparent 72%,rgba(255,255,255,.15) 75%,transparent 80%)}
.bubbles{position:absolute;inset:0}
.bubble{position:absolute;bottom:-60px;animation:rise var(--d) linear var(--delay) infinite}
.bubble i{position:absolute;inset:0;border-radius:50%;animation:wobble var(--w) ease-in-out infinite alternate;
  background:radial-gradient(circle at 32% 28%,#fff 0 10%,rgba(255,255,255,.6) 22%,rgba(150,210,240,.25) 58%,rgba(40,130,195,.4) 100%);
  box-shadow:inset 0 0 0 1px rgba(30,115,180,.45),0 1px 3px rgba(20,80,130,.18)}
.bubbles.back .bubble{filter:blur(1px);opacity:.6}
.bubbles.foam .bubble{bottom:auto;animation:bob var(--d) ease-in-out var(--delay) infinite alternate}
@keyframes rise{0%{transform:translateY(0);opacity:0}8%{opacity:1}90%{opacity:1}100%{transform:translateY(calc(-1 * var(--rise,900px)));opacity:0}}
@keyframes wobble{from{transform:translateX(calc(-1 * var(--x)))}to{transform:translateX(var(--x))}}
@keyframes bob{from{transform:translateY(-4px)}to{transform:translateY(5px)}}
@media (prefers-reduced-motion:reduce){.surface,.bubble,.bubble i{animation:none!important}}

.hero-inner{padding:150px 0 150px;max-width:900px;text-align:center}
.hero-brand{margin-bottom:34px}
.hero-logo{width:112px;height:auto;margin:0 auto 14px;filter:drop-shadow(0 6px 14px rgba(10,60,100,.3))}
.hero-cn{font-family:"Noto Serif TC","Noto Sans TC",serif;font-weight:700;font-size:clamp(40px,6vw,62px);letter-spacing:.35em;margin-right:-.35em;line-height:1.2;color:#0b2540}
.hero-en{font-weight:800;font-size:clamp(13px,1.6vw,18px);letter-spacing:.06em;color:#0b2540;margin-top:6px}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--aqua);margin-bottom:14px}
.eyebrow.dark,.hero .eyebrow{color:#0b6e86}
html[lang="km"] .eyebrow,html[lang="km"] .contact-list span{letter-spacing:0}
.hero h1{font-size:clamp(26px,3.6vw,40px);line-height:1.2;font-weight:800;letter-spacing:-.01em;margin-bottom:18px;color:#0a2a43}
html[lang="km"] .hero h1{line-height:1.5;letter-spacing:0}
.lead{font-size:clamp(16px,1.5vw,18px);color:#24465f;max-width:700px;margin:0 auto}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 44px;justify-content:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 26px;border-radius:999px;font:600 15px var(--font);cursor:pointer;border:2px solid transparent;transition:.2s}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:#0e8d92}
.btn-ghost{border-color:rgba(10,42,67,.45);color:var(--navy);background:rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.7)}
.stats{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:820px;margin:0 auto}
.stats li{background:rgba(255,255,255,.55);border-radius:12px;padding:14px 12px;backdrop-filter:blur(2px)}
.stats b{display:block;font-size:30px;font-weight:800;color:#0b5c8c}
.stats span{font-size:14px;color:#24465f}
.waves{position:absolute;bottom:-1px;left:0;width:100%;height:120px}

/* sections */
.section{padding:88px 0}
.section.alt{background:var(--alt)}
h2{font-size:clamp(26px,3.2vw,38px);line-height:1.25;color:var(--navy);font-weight:800;letter-spacing:-.01em;margin-bottom:18px}
html[lang="km"] h2{line-height:1.5}
.section p{margin-bottom:14px}
.about-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:start}
.feature-list{list-style:none;display:grid;gap:16px}
.feature-list li{display:flex;gap:14px;background:var(--alt);border-radius:var(--radius);padding:18px 20px}
.feature-list .ic{color:var(--teal);font-size:22px;line-height:1.3}
.feature-list b{color:var(--navy)}
.feature-list p{margin:4px 0 0;font-size:14px;color:var(--muted)}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.card{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);border:1px solid var(--line);transition:.2s}
.card:hover{transform:translateY(-3px);border-color:var(--aqua)}
.card-ic{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,rgba(18,163,168,.14),rgba(14,90,138,.14));display:grid;place-items:center;margin-bottom:18px}
.card-ic svg{width:26px;height:26px;fill:none;stroke:var(--blue);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:18px;color:var(--navy);margin-bottom:8px}
.card p{font-size:15px;color:var(--muted);margin:0}

.process-title{margin:64px 0 24px;font-size:22px;color:var(--navy)}
.process{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:s}
.process li{background:#fff;border-radius:var(--radius);padding:20px 16px;border-top:4px solid var(--teal);box-shadow:var(--shadow)}
.process b{display:block;color:var(--teal);font-size:22px;font-weight:800;margin-bottom:6px}
.process span{font-weight:600;color:var(--navy);font-size:15px}

.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.gallery figure{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:linear-gradient(135deg,#cfe6ee,#e8f4f7)}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.gallery figure:hover img{transform:scale(1.05)}
.gallery figure.ph::before{content:"LRI";position:absolute;inset:0;display:grid;place-items:center;font-size:42px;font-weight:800;color:rgba(14,90,138,.18)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:28px 16px 14px;background:linear-gradient(transparent,rgba(10,42,67,.85));color:#fff;font-weight:600;font-size:15px}

/* designs 设计案例：缩图显示局部特写 + 蓝色渐层，与工程案例照片同风格；点开看完整图 */
.designs{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.designs figure{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:#dfeef7;box-shadow:var(--shadow)}
.designs a{position:absolute;inset:0;display:block;cursor:zoom-in;overflow:hidden}
.designs img{width:100%;height:100%;object-fit:cover;transform:scale(1.25);transform-origin:var(--fx,50%) var(--fy,45%);transition:transform .5s}
.designs figure:hover img{transform:scale(1.35)}
.designs a::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(30,120,185,.16) 0%,rgba(20,95,160,.22) 50%,rgba(12,60,110,.7) 78%,rgba(8,32,62,.94) 100%)}
.designs img{filter:saturate(1.1) contrast(1.03)}
.designs a::before{content:"⤢";position:absolute;z-index:2;top:12px;right:12px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:rgba(10,42,67,.55);color:#fff;font-size:16px;opacity:0;transition:opacity .2s}
.designs figure:hover a::before{opacity:1}
.designs figcaption{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:28px 16px 14px;color:#fff;font-weight:600;font-size:15px;pointer-events:none;text-shadow:0 1px 6px rgba(0,20,40,.5)}
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(3,10,18,.97);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:56px 16px 24px}
.lightbox[hidden]{display:none}
.lightbox img{max-width:100%;max-height:calc(100vh - 130px);background:#fff;border-radius:8px;object-fit:contain}
.lightbox p{color:#fff;margin-top:14px;font-weight:600;text-align:center}
.lb-close{position:absolute;top:12px;right:14px;width:42px;height:42px;border-radius:50%;border:1px solid rgba(255,255,255,.4);background:none;color:#fff;font-size:20px;cursor:pointer}
html.lb-open,html.lb-open body{overflow:hidden}

/* contact */
/* 联络我们：水下光束背景（取自名片），往下渐变成深海蓝 */
.contact{color:#fff;background:
  radial-gradient(120% 60% at 50% 0,transparent 55%,rgba(6,25,60,.35) 100%),
  linear-gradient(180deg,rgba(21,78,145,0) 0,rgba(21,78,145,0) calc(max(100vw,1000px)*.12),#154e91 calc(max(100vw,1000px)*.195),#103f7a 55%,#0a2c5c 100%),
  url(../img/underwater.jpg?v=2) center top/max(100%,1000px) auto no-repeat,#154e91}
.contact{position:relative;isolation:isolate;overflow:hidden}
/* 大象一家：大象在前，两只小象在后面跟着走（取自名片线条，合成一张图） */
.contact::before{content:"";position:absolute;z-index:-1;pointer-events:none;left:calc(50% - 720px);bottom:0;
  width:clamp(300px,46vw,660px);aspect-ratio:1000/826;background:url(../img/elephant-family.png) left bottom/contain no-repeat;opacity:.24}
@media (max-width:960px){.contact::before{left:auto;right:-30px;bottom:auto;top:150px;width:340px;opacity:.2}}
.contact .eyebrow{color:#9fe8ff}
.contact h2,.contact p,.contact-list b{text-shadow:0 1px 8px rgba(0,20,60,.35)}
.contact h2{color:#fff}
.contact p{color:rgba(255,255,255,.82)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:stretch}
.contact-grid>div{display:flex;flex-direction:column}
.contact-list{margin-bottom:28px}
.form .grow{flex:1;display:flex;flex-direction:column}
.form .grow textarea{flex:1;min-height:110px}
.contact-list{list-style:none;margin-top:28px;display:grid;gap:14px}
.contact-list li{display:flex;flex-direction:column;border-bottom:1px solid rgba(255,255,255,.14);padding-bottom:12px}
.contact-list span{font-size:13px;color:var(--aqua);text-transform:uppercase;letter-spacing:.08em}
.contact-list b{font-weight:500}
.contact-list a:hover{color:var(--aqua)}
.card-dl{display:flex;gap:18px;align-items:center;margin-top:auto;padding:16px;border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);background:rgba(255,255,255,.06)}
.card-thumb img{width:96px;height:auto;border-radius:6px;box-shadow:0 6px 18px rgba(0,0,0,.35);transition:transform .2s}
.card-thumb:hover img{transform:scale(1.04)}
.card-dl>div{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.card-dl b{font-size:16px}
.btn-sm{padding:8px 18px;font-size:14px}
.btn-line{border-color:rgba(255,255,255,.55);color:#fff}
.btn-line:hover{background:rgba(255,255,255,.12)}
.form{background:#fff;color:var(--text);border-radius:var(--radius);padding:30px;display:flex;flex-direction:column;gap:14px;box-shadow:0 20px 50px rgba(0,0,0,.25)}
.form label{display:grid;gap:6px;font-size:14px;font-weight:600;color:var(--navy)}
.form input,.form textarea{font:400 15px var(--font);padding:11px 13px;border:1px solid var(--line);border-radius:10px;width:100%;color:var(--text);background:#fbfdfe}
.form input:focus,.form textarea:focus{outline:2px solid var(--aqua);border-color:transparent}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.hp{position:absolute;left:-9999px}
.form-note:empty{display:none}
.form-note{font-size:14px;margin:0;min-height:1em;color:var(--teal)!important}
.form-note.err{color:#c0392b!important}

.site-footer{background:#061d2f;color:rgba(255,255,255,.65);font-size:14px}
.footer-inner{display:flex;justify-content:space-between;gap:16px;padding:22px 0;flex-wrap:wrap}
.site-footer a:hover{color:#fff}

/* responsive */
@media (max-width:960px){
  .cards,.gallery,.designs{grid-template-columns:repeat(2,1fr)}
  .process{grid-template-columns:repeat(2,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:36px}
}
@media (max-width:1100px){
  /* 手机选单：从顶部栏下方滑出，背后加半透明遮罩，点遮罩或选项会收起 */
  .nav{position:fixed;top:68px;left:0;right:0;z-index:60;flex-direction:column;gap:0;padding:6px 0 10px;
    background:var(--bg);border-bottom:1px solid var(--line);box-shadow:0 18px 30px rgba(0,0,0,.18);
    max-height:calc(100vh - 68px);overflow-y:auto;
    visibility:hidden;opacity:0;transform:translateY(-10px);transition:opacity .2s,transform .2s,visibility 0s .2s}
  .nav.open{visibility:visible;opacity:1;transform:none;transition:opacity .2s,transform .2s}
  .nav a{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;font-size:16px;border-top:1px solid var(--line)}
  .nav a:first-child{border-top:0}
  .nav a::after{content:"›";font-size:22px;line-height:1;color:var(--muted)}
  .nav a:active{background:var(--alt)}
  .nav-backdrop{display:block;position:fixed;inset:68px 0 0 0;z-index:40;background:rgba(5,15,25,.45);opacity:0;visibility:hidden;transition:opacity .2s,visibility 0s .2s}
  .nav-backdrop.open{opacity:1;visibility:visible;transition:opacity .2s}
  html.menu-open,html.menu-open body{overflow:hidden}
  .nav-toggle{display:flex}
  .header-inner{gap:10px}
}
@media (max-width:560px){
  .brand-text strong{font-size:13px}
  .brand-text small{font-size:11px}
  .brand-logo,.brand-mark{height:36px;width:36px}
  .lang-switch button{padding:5px 7px;font-size:12px}
  .theme-toggle{width:34px;height:34px}
  .nav-toggle{width:36px;height:36px}
  .hero-inner{padding:130px 0 120px}
  .stats{grid-template-columns:1fr;gap:10px}
  .cards,.gallery,.designs,.row2{grid-template-columns:1fr}
  .section{padding:64px 0}
  .form{padding:22px}
}
@media (max-width:430px){ .brand-text{display:none} }

/* ===== 夜间模式 =====
   默认跟随系统；点右上角 太阳/月亮 按钮可手动切换（记在浏览器里） */
:root{color-scheme:light dark}
:root[data-theme="light"]{color-scheme:light}
:root[data-theme="dark"]{color-scheme:dark}
:root[data-theme="dark"]{--navy:#e6f1f8; --blue:#6cc3ee; --teal:#16b3b8; --aqua:#6fe0dc;
    --bg:#0b1622; --alt:#0f1f2e; --text:#d3e2ed; --muted:#93a9b9; --line:#20374a;
    --shadow:0 8px 28px rgba(0,0,0,.35);}
:root[data-theme="dark"] .site-header{background:rgba(11,22,34,.92)}
:root[data-theme="dark"] .lang-switch button.active{background:#1c6b98;color:#fff}
:root[data-theme="dark"] /* hero：夜晚的水 —— 深色天空 + 深蓝海水，泡泡带一点亮边 */
  .hero{background:linear-gradient(180deg,#0a1724 0 180px,#0d4c78 180px,#0b3d63 40%,#092f4e 72%,#0b1622 100%)}
:root[data-theme="dark"] .surface.s1 .fill{fill:#0d4c78}
:root[data-theme="dark"] .surface.s1 .line{stroke:#9fd8f7;opacity:.75}
:root[data-theme="dark"] .surface.s2 .fill{fill:#1d6fa3}
:root[data-theme="dark"] .rays{background:
    linear-gradient(105deg,transparent 30%,rgba(140,210,255,.08) 34%,transparent 40%),
    linear-gradient(115deg,transparent 55%,rgba(140,210,255,.07) 58%,transparent 64%),
    linear-gradient(98deg,transparent 72%,rgba(140,210,255,.06) 75%,transparent 80%)}
:root[data-theme="dark"] .bubble i{background:radial-gradient(circle at 32% 28%,rgba(255,255,255,.95) 0 10%,rgba(200,235,255,.35) 24%,rgba(120,190,235,.12) 58%,rgba(150,215,255,.35) 100%);
    box-shadow:inset 0 0 0 1px rgba(170,220,255,.55),0 0 4px rgba(120,200,255,.25)}
:root[data-theme="dark"] .hero-cn,:root[data-theme="dark"] .hero-en,:root[data-theme="dark"] .hero h1{color:#eaf5fc}
:root[data-theme="dark"] .hero .eyebrow,:root[data-theme="dark"] .eyebrow.dark{color:#6fe0dc}
:root[data-theme="dark"] .lead{color:#b7d1e4}
:root[data-theme="dark"] .btn-ghost{border-color:rgba(255,255,255,.45);color:#eaf5fc;background:rgba(255,255,255,.06)}
:root[data-theme="dark"] .btn-ghost:hover{background:rgba(255,255,255,.14)}
:root[data-theme="dark"] .stats li{background:rgba(6,24,40,.55)}
:root[data-theme="dark"] .stats b{color:#7cc8f2}
:root[data-theme="dark"] .stats span{color:#b7d1e4}
:root[data-theme="dark"] .card,:root[data-theme="dark"] .process li{background:#112535}
:root[data-theme="dark"] .card-ic{background:linear-gradient(135deg,rgba(22,179,184,.2),rgba(108,195,238,.18))}
:root[data-theme="dark"] .gallery figure{background:linear-gradient(135deg,#12293a,#0f2130)}
:root[data-theme="dark"] .contact{background:linear-gradient(rgba(2,10,22,.45),rgba(2,10,22,.45)),
  linear-gradient(180deg,rgba(21,78,145,0) 0,rgba(21,78,145,0) calc(max(100vw,1000px)*.12),#154e91 calc(max(100vw,1000px)*.195),#0e3a70 55%,#082450 100%),
  url(../img/underwater.jpg?v=2) center top/max(100%,1000px) auto no-repeat,#154e91}
:root[data-theme="dark"] .form{background:#0f2232;box-shadow:0 20px 50px rgba(0,0,0,.45)}
:root[data-theme="dark"] .form label{color:#d3e2ed}
:root[data-theme="dark"] .form input,:root[data-theme="dark"] .form textarea{background:#0a1a28;border-color:#26405a;color:#e6f1f8}
:root[data-theme="dark"] .form input::placeholder,:root[data-theme="dark"] .form textarea::placeholder{color:#7d94a6}
:root[data-theme="dark"] .site-footer{background:#050f18}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]){--navy:#e6f1f8; --blue:#6cc3ee; --teal:#16b3b8; --aqua:#6fe0dc;
    --bg:#0b1622; --alt:#0f1f2e; --text:#d3e2ed; --muted:#93a9b9; --line:#20374a;
    --shadow:0 8px 28px rgba(0,0,0,.35);}
:root:not([data-theme="light"]) .site-header{background:rgba(11,22,34,.92)}
:root:not([data-theme="light"]) .lang-switch button.active{background:#1c6b98;color:#fff}
:root:not([data-theme="light"]) /* hero：夜晚的水 —— 深色天空 + 深蓝海水，泡泡带一点亮边 */
  .hero{background:linear-gradient(180deg,#0a1724 0 180px,#0d4c78 180px,#0b3d63 40%,#092f4e 72%,#0b1622 100%)}
:root:not([data-theme="light"]) .surface.s1 .fill{fill:#0d4c78}
:root:not([data-theme="light"]) .surface.s1 .line{stroke:#9fd8f7;opacity:.75}
:root:not([data-theme="light"]) .surface.s2 .fill{fill:#1d6fa3}
:root:not([data-theme="light"]) .rays{background:
    linear-gradient(105deg,transparent 30%,rgba(140,210,255,.08) 34%,transparent 40%),
    linear-gradient(115deg,transparent 55%,rgba(140,210,255,.07) 58%,transparent 64%),
    linear-gradient(98deg,transparent 72%,rgba(140,210,255,.06) 75%,transparent 80%)}
:root:not([data-theme="light"]) .bubble i{background:radial-gradient(circle at 32% 28%,rgba(255,255,255,.95) 0 10%,rgba(200,235,255,.35) 24%,rgba(120,190,235,.12) 58%,rgba(150,215,255,.35) 100%);
    box-shadow:inset 0 0 0 1px rgba(170,220,255,.55),0 0 4px rgba(120,200,255,.25)}
:root:not([data-theme="light"]) .hero-cn,:root:not([data-theme="light"]) .hero-en,:root:not([data-theme="light"]) .hero h1{color:#eaf5fc}
:root:not([data-theme="light"]) .hero .eyebrow,:root:not([data-theme="light"]) .eyebrow.dark{color:#6fe0dc}
:root:not([data-theme="light"]) .lead{color:#b7d1e4}
:root:not([data-theme="light"]) .btn-ghost{border-color:rgba(255,255,255,.45);color:#eaf5fc;background:rgba(255,255,255,.06)}
:root:not([data-theme="light"]) .btn-ghost:hover{background:rgba(255,255,255,.14)}
:root:not([data-theme="light"]) .stats li{background:rgba(6,24,40,.55)}
:root:not([data-theme="light"]) .stats b{color:#7cc8f2}
:root:not([data-theme="light"]) .stats span{color:#b7d1e4}
:root:not([data-theme="light"]) .card,:root:not([data-theme="light"]) .process li{background:#112535}
:root:not([data-theme="light"]) .card-ic{background:linear-gradient(135deg,rgba(22,179,184,.2),rgba(108,195,238,.18))}
:root:not([data-theme="light"]) .gallery figure{background:linear-gradient(135deg,#12293a,#0f2130)}
:root:not([data-theme="light"]) .contact{background:linear-gradient(rgba(2,10,22,.45),rgba(2,10,22,.45)),
  linear-gradient(180deg,rgba(21,78,145,0) 0,rgba(21,78,145,0) calc(max(100vw,1000px)*.12),#154e91 calc(max(100vw,1000px)*.195),#0e3a70 55%,#082450 100%),
  url(../img/underwater.jpg?v=2) center top/max(100%,1000px) auto no-repeat,#154e91}
:root:not([data-theme="light"]) .form{background:#0f2232;box-shadow:0 20px 50px rgba(0,0,0,.45)}
:root:not([data-theme="light"]) .form label{color:#d3e2ed}
:root:not([data-theme="light"]) .form input,:root:not([data-theme="light"]) .form textarea{background:#0a1a28;border-color:#26405a;color:#e6f1f8}
:root:not([data-theme="light"]) .form input::placeholder,:root:not([data-theme="light"]) .form textarea::placeholder{color:#7d94a6}
:root:not([data-theme="light"]) .site-footer{background:#050f18}
}

/* 太阳/月亮切换按钮 */
.theme-toggle{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:none;color:var(--navy);display:grid;place-items:center;cursor:pointer;flex:none;transition:.2s}
.theme-toggle:hover{border-color:var(--teal);color:var(--teal)}
.theme-toggle svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .i-sun{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:block}
:root[data-theme="dark"] .theme-toggle .i-moon{display:none}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]) .theme-toggle .i-sun{display:block}
:root:not([data-theme="light"]) .theme-toggle .i-moon{display:none}
}