/* ===== Yixin (溢鑫) VG Graphene — Corporate Website ===== */
@import url("fonts.css");
:root{
  --navy:#16234f;
  --navy-2:#1b2e63;
  --blue:#0e63b6;
  --blue-2:#1a8fd6;
  --cyan:#29b6e8;
  --gold:#c9a24a;
  --gold-2:#e0be6a;
  --ink:#12233f;
  --muted:#5a6b82;
  --line:#e2ebf5;
  --bg:#f4f9ff;
  --bg-soft:#eaf4fe;
  --white:#ffffff;
  --shadow:0 18px 50px -18px rgba(16,45,95,.28);
  --shadow-sm:0 8px 24px -10px rgba(16,45,95,.22);
  --radius:16px;
  --maxw:1200px;
  --grad-hero:linear-gradient(135deg,#0b2a63 0%,#0e4a9c 45%,#1a8fd6 100%);
  --grad-blue:linear-gradient(135deg,#0e63b6,#1a8fd6);
  --grad-soft:linear-gradient(160deg,#eaf5fe 0%,#d6ecfb 100%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:74px}
body{
  margin:0;
  font-family:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
/* Chinese glyphs use a native CJK face; Latin/Vietnamese stay on Be Vietnam Pro */
:lang(zh){font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Be Vietnam Pro",sans-serif}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
section{padding:84px 0;position:relative}
.eyebrow{display:inline-block;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;font-weight:700;color:var(--blue);background:var(--bg-soft);padding:6px 14px;border-radius:999px;margin-bottom:16px}
h1,h2,h3,h4{line-height:1.25;color:var(--navy);font-weight:800;margin:0 0 .5em}
h2.sec-title{font-size:clamp(1.7rem,3.4vw,2.5rem);margin-bottom:.35em}
.sec-sub{color:var(--muted);font-size:1.05rem;max-width:760px;margin:0 auto 8px}
.center{text-align:center}
.center .sec-sub{margin-inline:auto}
p{margin:0 0 1em}

/* hexagon graphene texture */
.hex-bg{position:absolute;inset:0;opacity:.5;pointer-events:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='56' height='96' viewBox='0 0 56 96'><path d='M28 0l28 16v32L28 64 0 48V16z' fill='none' stroke='%23bcdcf7' stroke-width='1.2'/></svg>");
  background-size:56px 96px;-webkit-mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent)}

/* ===== Header ===== */
header{position:fixed;top:0;left:0;right:0;z-index:60;backdrop-filter:saturate(140%) blur(10px);
  background:rgba(255,255,255,.86);border-bottom:1px solid var(--line);transition:.3s}
.nav{display:flex;align-items:center;gap:20px;height:70px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;color:var(--navy)}
.brand img{height:40px;width:auto}
.brand{flex:0 0 auto}
.brand-tag small{display:block;font-size:.58rem;letter-spacing:.1em;color:var(--blue);font-weight:800;line-height:1;white-space:nowrap}
@media(max-width:520px){.brand-tag{display:none}}
.nav-links{display:flex;gap:2px;margin-left:auto;align-items:center}
.lang{margin-left:14px}
.nav-links a{padding:9px 11px;border-radius:9px;font-weight:600;font-size:.88rem;color:#26374f;transition:.2s;white-space:nowrap}
.nav-links a:hover{background:var(--bg-soft);color:var(--blue)}
.lang{display:flex;gap:3px;background:var(--bg-soft);border-radius:999px;padding:3px}
.lang button{border:0;background:transparent;padding:6px 11px;border-radius:999px;font-weight:700;font-size:.82rem;color:var(--muted);cursor:pointer;transition:.2s;font-family:inherit}
.lang button.active{background:var(--grad-blue);color:#fff;box-shadow:var(--shadow-sm)}
.burger{display:none;margin-left:10px;background:none;border:0;cursor:pointer;padding:8px}
.burger span{display:block;width:24px;height:2.4px;background:var(--navy);margin:5px 0;border-radius:2px;transition:.3s}

/* ===== Hero ===== */
.hero{min-height:100vh;display:flex;align-items:center;color:#fff;position:relative;overflow:hidden;background:var(--grad-hero)}
.hero video,.hero .hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.26}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(9,28,66,.86),rgba(12,58,120,.6) 60%,rgba(26,143,214,.35))}
.hero .hex-bg{opacity:.18;-webkit-mask-image:none}
.hero-inner{position:relative;z-index:2;max-width:900px;padding:110px 0 70px}
.hero .tag{display:inline-block;border:1px solid rgba(255,255,255,.4);border-radius:999px;padding:7px 16px;font-size:.82rem;letter-spacing:.05em;margin-bottom:22px;background:rgba(255,255,255,.08)}
.hero h1{color:#fff;font-size:clamp(2.1rem,5.3vw,3.9rem);line-height:1.15;margin-bottom:.35em;text-shadow:0 4px 30px rgba(0,0,0,.25)}
.hero h1 .hl{background:linear-gradient(90deg,#ffe6a6,var(--gold-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:clamp(1.05rem,2vw,1.4rem);color:#dceafd;max-width:680px;margin-bottom:14px;font-weight:500}
.hero .sub{color:#a9c9ef;max-width:640px;margin-bottom:32px}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:12px;font-weight:700;font-size:.98rem;cursor:pointer;transition:.25s;border:1px solid transparent}
.btn-gold{background:linear-gradient(90deg,var(--gold),var(--gold-2));color:#3a2c00;box-shadow:0 12px 30px -10px rgba(201,162,74,.6)}
.btn-gold:hover{transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.2)}
.btn-blue{background:var(--grad-blue);color:#fff;box-shadow:var(--shadow-sm)}
.btn-blue:hover{transform:translateY(-2px)}

/* stat strip */
.stats{position:relative;z-index:3;margin-top:20px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:18px;padding:22px;display:grid;grid-template-columns:repeat(5,1fr);gap:8px;backdrop-filter:blur(6px)}
.stats .st{text-align:center;padding:6px 8px;border-right:1px solid rgba(255,255,255,.14)}
.stats .st:last-child{border-right:0}
.stats .num{font-size:clamp(1.3rem,2.6vw,2rem);font-weight:800;color:#ffe6a6;line-height:1.1}
.stats .lbl{font-size:.76rem;color:#cfe1fb;margin-top:4px}

/* ===== generic layout blocks ===== */
.grid{display:grid;gap:26px}
.g2{grid-template-columns:1fr 1fr}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.alt{background:linear-gradient(180deg,#fff,var(--bg-soft))}
.dark{background:var(--navy);color:#dce7f7}
.dark h2,.dark h3{color:#fff}
.dark .sec-sub{color:#a9c1e2}
.dark .eyebrow{background:rgba(255,255,255,.1);color:#8fd0f5}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);transition:.28s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#c9e2fb}
.card .ico{width:52px;height:52px;border-radius:13px;display:grid;place-items:center;background:var(--grad-soft);color:var(--blue);margin-bottom:16px;font-size:1.5rem}
.card h3{font-size:1.18rem;margin-bottom:.4em}
.card p{color:var(--muted);font-size:.95rem;margin:0}
.card .top-accent{position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad-blue)}

.media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#eef5fd}
.media img,.media video{width:100%;height:auto;display:block}
.figcap{font-size:.85rem;color:var(--muted);margin-top:10px;text-align:center}

.feat-list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:13px}
.feat-list li{display:flex;gap:12px;align-items:flex-start}
.feat-list .dot{flex:0 0 auto;width:26px;height:26px;border-radius:8px;background:var(--grad-soft);color:var(--blue);display:grid;place-items:center;font-weight:800;font-size:.85rem;margin-top:2px}
.feat-list b{color:var(--navy)}
.feat-list span{color:var(--muted)}

/* spec / data table */
.tbl-wrap{overflow-x:auto;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow-sm);background:#fff}
table.data{width:100%;border-collapse:collapse;min-width:520px;font-size:.93rem}
table.data th,table.data td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line)}
table.data thead th{background:var(--navy);color:#fff;font-weight:700;position:sticky;top:0}
table.data tbody tr:nth-child(even){background:var(--bg-soft)}
table.data tbody tr:hover{background:#e3f0fd}
table.data td:first-child{font-weight:700;color:var(--navy)}
table.data tr.tr-total{background:var(--bg-soft);font-weight:800}
table.data tr.tr-total td{font-weight:800}
.hl-cell{color:var(--blue);font-weight:800}

/* pills */
.pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.pill{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:.9rem;font-weight:600;color:var(--navy);box-shadow:var(--shadow-sm)}
.pill.blue{background:var(--grad-blue);color:#fff;border-color:transparent}

/* app pillars */
.pillar{position:relative;border-radius:var(--radius);overflow:hidden;min-height:340px;display:flex;align-items:flex-end;color:#fff;box-shadow:var(--shadow)}
.pillar img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:.5s}
.pillar:hover img{transform:scale(1.06)}
.pillar::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(11,30,66,.92),rgba(11,30,66,.25) 55%,transparent)}
.pillar .pc{position:relative;z-index:2;padding:26px}
.pillar h3{color:#fff;font-size:1.35rem;margin-bottom:.3em}
.pillar p{color:#d6e4fa;font-size:.92rem;margin:0}
.pillar .num-badge{position:absolute;top:18px;left:18px;z-index:2;background:var(--gold);color:#3a2c00;width:38px;height:38px;border-radius:10px;display:grid;place-items:center;font-weight:800}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gal a{border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--line);aspect-ratio:16/10;background:#dce9f7}
.gal img{width:100%;height:100%;object-fit:cover;transition:.4s}
.gal a:hover img{transform:scale(1.08)}

/* timeline */
.timeline{position:relative;margin-top:36px}
.timeline::before{content:"";position:absolute;left:26px;top:8px;bottom:8px;width:3px;background:linear-gradient(var(--blue),var(--cyan))}
.tl-item{position:relative;padding:0 0 34px 70px}
.tl-item .yr{position:absolute;left:0;top:-2px;width:54px;height:54px;border-radius:50%;background:var(--grad-blue);color:#fff;display:grid;place-items:center;font-weight:800;font-size:.86rem;box-shadow:var(--shadow-sm);z-index:2;text-align:center;line-height:1.05}
.tl-item h4{margin:.1em 0 .5em;color:var(--navy)}
.tl-item ul{margin:0;padding-left:18px;color:var(--muted)}
.tl-item ul li{margin-bottom:5px}

/* team */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.member{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:.25s}
.member:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.member .av{width:60px;height:60px;border-radius:50%;background:var(--grad-hero);color:#fff;display:grid;place-items:center;font-size:1.4rem;font-weight:800;margin-bottom:14px}
.member .av.photo{width:88px;height:88px;padding:0;overflow:hidden;border:3px solid #fff;box-shadow:0 6px 18px -6px rgba(16,45,95,.35);background:var(--bg-soft)}
.member .av.photo img{width:100%;height:100%;object-fit:cover;object-position:center top}
.member .role{color:var(--blue);font-weight:700;font-size:.9rem;margin-bottom:8px}
.member ul{margin:0;padding-left:16px;color:var(--muted);font-size:.88rem}
.member ul li{margin-bottom:3px}

/* awards */
.awards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.award{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow-sm)}
.award .medal{font-size:1.6rem}
.award b{color:var(--navy);font-size:.95rem}
.award span{display:block;color:var(--muted);font-size:.82rem}

/* finance chart */
.bars{display:flex;align-items:flex-end;gap:18px;height:280px;padding:20px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow-sm)}
.bar{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;height:100%;gap:8px}
.bar .col{width:64%;background:var(--grad-blue);border-radius:8px 8px 0 0;position:relative;min-height:6px;transition:height 1s cubic-bezier(.2,.7,.2,1)}
.bar:last-child .col{background:linear-gradient(180deg,var(--gold-2),var(--gold))}
.bar .v{font-weight:800;color:var(--navy);font-size:.9rem}
.bar .yr{color:var(--muted);font-size:.85rem;font-weight:600}

/* contact */
.contact-card{background:var(--grad-hero);color:#fff;border-radius:22px;padding:44px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.contact-card .hex-bg{opacity:.14;-webkit-mask-image:none}
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;position:relative;z-index:2;margin-top:18px}
.ci{display:flex;gap:14px;align-items:center;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:16px}
.ci .ico{font-size:1.4rem}
.ci small{display:block;color:#bcd4f5;font-size:.76rem;letter-spacing:.05em}
.ci b{font-size:1rem;word-break:break-all}

/* footer */
footer{background:var(--navy);color:#9fb4d6;padding:40px 0}
.foot{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.foot .brand b{color:#fff}
.foot small{color:#7d93b8;font-size:.82rem}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(6,18,42,.92);z-index:100;display:none;align-items:center;justify-content:center;padding:30px}
.lb.open{display:flex}
.lb img{max-width:92vw;max-height:88vh;border-radius:10px;box-shadow:0 30px 80px rgba(0,0,0,.6)}
.lb .x{position:absolute;top:20px;right:26px;color:#fff;font-size:2rem;cursor:pointer;background:none;border:0}
.lb .nav-btn{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.14);border:0;color:#fff;font-size:1.6rem;width:50px;height:50px;border-radius:50%;cursor:pointer}
.lb .prev{left:22px}.lb .next{right:22px}

/* reveal anim */
.reveal{opacity:0;transform:translateY(26px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* representative publications */
.papers{list-style:none;counter-reset:p;padding:0;margin:16px 0 0;display:grid;gap:12px}
.papers li{counter-increment:p;position:relative;background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:12px;padding:15px 18px 15px 54px;box-shadow:var(--shadow-sm)}
.papers li::before{content:counter(p,decimal-leading-zero);position:absolute;left:14px;top:15px;font-weight:800;color:var(--blue);font-size:1rem}
.papers .ptitle{display:block;color:var(--navy);font-weight:600;font-size:.95rem;line-height:1.45}
.papers .porg{display:block;margin-top:6px;color:var(--muted);font-size:.85rem;font-weight:600}

.note{font-size:.82rem;color:var(--muted);font-style:italic}
.src{font-size:.75rem;color:#93a6bf}

/* ===================== RESPONSIVE ARCHITECTURE ===================== */

/* Nav collapses to a drawer on tablets & phones */
@media(max-width:1080px){
  .nav-links{position:fixed;top:70px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:14px;gap:2px;box-shadow:var(--shadow);transform:translateY(-160%);transition:.35s;border-bottom:1px solid var(--line);max-height:calc(100dvh - 70px);overflow:auto;overscroll-behavior:contain}
  .nav-links.open{transform:none}
  .nav-links a{padding:13px 12px;font-size:1.02rem;border-radius:10px}
  .nav-links a:active{background:var(--bg-soft)}
  .burger{display:block}
  .lang{margin-left:auto}
}

/* ---- Tablet (≤960px) ---- */
@media(max-width:960px){
  .split{grid-template-columns:1fr;gap:28px}
  .g3,.g4,.team-grid{grid-template-columns:repeat(2,1fr)}
  .gal{grid-template-columns:repeat(3,1fr)}
  .stats{grid-template-columns:repeat(3,1fr);gap:14px}
  .stats .st:nth-child(3){border-right:0}
  .contact-grid{grid-template-columns:1fr}
  .awards{grid-template-columns:1fr}
  .hero-inner{padding:104px 0 56px}
}

/* ---- Phone (≤720px) ---- */
@media(max-width:720px){
  html{scroll-padding-top:82px}
  section{padding:56px 0}
  .container{padding:0 18px}
  .eyebrow{font-size:.72rem}
  /* single-column stacks */
  .g2,.g3,.g4,.team-grid{grid-template-columns:1fr}
  .gal{grid-template-columns:repeat(2,1fr);gap:10px}
  /* hero fits the screen instead of forcing 100vh */
  .hero{min-height:auto}
  .hero-inner{padding:100px 0 48px;max-width:100%}
  .hero .tag{margin-bottom:16px;font-size:.76rem}
  .hero .lead{margin-bottom:12px}
  .hero .sub{margin-bottom:24px}
  .btns{gap:10px}
  .btn{padding:13px 20px;flex:1 1 auto;justify-content:center}
  /* stats: 2 up, tidy dividers */
  .stats{grid-template-columns:repeat(2,1fr);gap:6px;padding:16px}
  .stats .st{border-right:0;padding:10px 6px}
  .stats .st:not(:last-child){border-bottom:1px solid rgba(255,255,255,.14)}
  .stats .st:nth-last-child(2):nth-child(odd){border-bottom:0}
  /* tighter cards & sections */
  .card{padding:22px}
  .contact-card{padding:28px 22px;border-radius:18px}
  .pillar{min-height:260px}
  /* timeline & chart */
  .tl-item{padding-left:58px;padding-bottom:28px}
  .timeline::before{left:24px}
  .bars{gap:6px;height:220px;padding:14px}
  .bar .v{font-size:.78rem}
  .bar .yr{font-size:.76rem}
  /* full-width doc images get a "tap to zoom" affordance */
  .media[data-full]{position:relative}

  /* ---- Responsive data tables → stacked cards (no more cut-off scroll) ---- */
  .tbl-wrap{overflow:visible;border:0;box-shadow:none;background:transparent;border-radius:0}
  table.data{min-width:0;width:100%;font-size:.92rem}
  table.data thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
  table.data tr{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;box-shadow:var(--shadow-sm);overflow:hidden}
  table.data tbody tr:nth-child(even),table.data tbody tr:hover{background:#fff}
  table.data td{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:11px 15px;border-bottom:1px solid var(--line);text-align:right;white-space:normal}
  table.data td:last-child{border-bottom:0}
  table.data td::before{content:attr(data-label);flex:0 0 42%;text-align:left;font-weight:700;color:var(--muted);font-size:.85rem}
  /* first column becomes the card's title bar */
  table.data td:first-child{display:block;text-align:left;background:var(--navy);color:#fff;font-weight:800;padding:12px 15px}
  table.data td:first-child::before{content:none}
  table.data tr.tr-total td:first-child{background:var(--blue)}
  table.data tr.tr-total td{background:var(--bg-soft)}
}

/* ---- Small phone (≤430px) ---- */
@media(max-width:430px){
  section{padding:46px 0}
  .container{padding:0 15px}
  header .brand img{height:34px}
  .lang button{padding:6px 9px;font-size:.78rem}
  .hero-inner{padding:88px 0 40px}
  .hero h1{font-size:2rem}
  .gal{grid-template-columns:1fr 1fr}
  .stats .num{font-size:1.35rem}
  .bars{height:190px}
}

/* Guard against any accidental horizontal overflow on phones */
@media(max-width:1080px){ html,body{overflow-x:hidden} }