/* Tongke titanium sourcing site — shared styles */
:root{
  --ink:#101c2c; --ink2:#3c4d61; --mut:#69798d; --line:#d8e0e8;
  --bg:#f4f7fa; --card:#fff;
  --acc:#0b5e8a; --acc2:#094a6d; --hi:#12b5d4;
  --wa:#1faa53; --amber:#c98a12;
  --g1:#5b8def; --g2:#2fb380; --g4:#b3742b; --g5:#8f5fd0; --g7:#c05a5a; --g9:#3aa6b8; --g12:#7a6f55; --g23:#a04f8f;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Arial,"Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.62;font-size:16.5px}
img{max-width:100%;height:auto;display:block;border-radius:10px}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
h1{font-size:2.1rem;line-height:1.22;margin:.4em 0 .5em}
h2{font-size:1.45rem;margin:1.6em 0 .6em}
h3{font-size:1.15rem;margin:1.3em 0 .4em}
p{margin:.7em 0}
.lead{font-size:1.13rem;color:var(--ink2)}

/* header */
.site-head{background:var(--ink);color:#fff;position:sticky;top:0;z-index:50}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:10px;padding-bottom:10px}
.logo{display:flex;align-items:center;gap:10px;color:#fff}
.logo:hover{text-decoration:none}
.lg-mark{background:var(--hi);color:#06202c;font-weight:800;border-radius:9px;padding:6px 9px;font-size:1.05rem;letter-spacing:.5px}
.lg-txt{font-weight:700;line-height:1.15;display:flex;flex-direction:column}
.lg-txt em{font-style:normal;font-weight:400;font-size:.72rem;color:#9db4c8}
.main-nav{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.main-nav a{color:#cfdcec;font-size:.94rem;padding:6px 2px}
.main-nav a:hover,.main-nav a.active{color:#fff;text-decoration:none}
.main-nav a.active{border-bottom:2px solid var(--hi)}
.burger{display:none;background:none;border:1px solid #3b5068;color:#fff;font-size:1.3rem;border-radius:8px;padding:2px 10px;cursor:pointer}
@media(max-width:940px){.burger{display:block}.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--ink);flex-direction:column;align-items:flex-start;padding:14px 20px;gap:8px}.main-nav.open{display:flex}}

/* spec banner */
.spec-banner{background:#0d2438;color:#bcd2e4;font-size:.86rem;padding:9px 0}
.spec-banner .wrap{display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;justify-content:center}
.spec-banner strong{color:#fff}
.spec-banner .dot{width:5px;height:5px;border-radius:50%;background:var(--hi);display:inline-block}

/* buttons */
.btn{display:inline-block;border-radius:9px;padding:11px 20px;font-weight:600;font-size:.98rem;border:1px solid transparent;cursor:pointer}
.btn:hover{text-decoration:none;filter:brightness(1.06)}
.btn.primary{background:var(--acc);color:#fff}
.btn.wa{background:var(--wa);color:#fff}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn.small{padding:7px 14px;font-size:.88rem;background:var(--hi);color:#06202c}
.cta-band{background:linear-gradient(120deg,#0d2438,#0b3a57 65%,#0d4a6d);color:#e8f1f8;padding:38px 0;margin-top:52px}
.cta-band h2{margin-top:0;color:#fff}
.cta-band p{color:#c4d6e6}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px}
.cta-btns .btn.ghost{border-color:#3f6076;color:#dce8f2}

/* page */
.page{padding:26px 0 8px}
.crumbs{font-size:.85rem;color:var(--mut);margin:14px 0 4px}
.crumbs a{color:var(--mut)}
.cr-sep{margin:0 7px}

/* hero */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:30px;align-items:center;padding:26px 0 8px}
.hero ul.ticks{list-style:none;padding:0;margin:14px 0}
.hero ul.ticks li{padding-left:26px;position:relative;margin:7px 0;color:var(--ink2)}
.hero ul.ticks li::before{content:"✓";position:absolute;left:2px;color:var(--g2);font-weight:700}
@media(max-width:860px){.hero{grid-template-columns:1fr}}

/* cards */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:980px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g4,.g3,.g2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:8px}
.card h3{margin:2px 0 0}
.card p{font-size:.92rem;color:var(--ink2);margin:2px 0}
.card .rng{font-size:.85rem;color:var(--mut)}
.card a.more{margin-top:auto;font-weight:600;font-size:.92rem}
.card img{border-radius:9px}
.chip{display:inline-block;font-size:.75rem;border-radius:20px;padding:2px 10px;background:#eaf3f9;color:var(--acc2);font-weight:600;margin-right:5px}

/* tables */
.tbl-wrap{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:12px;margin:16px 0}
table{border-collapse:collapse;width:100%;font-size:.93rem;min-width:640px}
caption{caption-side:top;text-align:left;font-weight:700;padding:12px 14px 4px;color:var(--ink)}
th{background:#0d2438;color:#dfeaf4;text-align:left;padding:9px 12px;font-weight:600;font-size:.86rem;white-space:nowrap}
td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:top;color:var(--ink2)}
tbody tr:nth-child(even){background:#f8fbfd}
td b{color:var(--ink)}
.tbc{color:var(--amber);font-size:.8rem;white-space:nowrap}

/* grade colour dots */
.dotg{display:inline-block;width:11px;height:11px;border-radius:50%;margin-right:6px;vertical-align:-1px}
.d1{background:var(--g1)}.d2{background:var(--g2)}.d4{background:var(--g4)}.d5{background:var(--g5)}
.d7{background:var(--g7)}.d9{background:var(--g9)}.d12{background:var(--g12)}.d23{background:var(--g23)}

/* media blocks */
.wide-fig{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:22px 0}
.wide-fig figcaption{padding:12px 16px;font-size:13.5px;color:var(--ink2)}
.video-fig{margin:22px 0;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.video-fig video{width:100%;display:block;border-radius:0}
.video-fig figcaption{padding:10px 16px;font-size:13.5px;color:var(--ink2)}
.img-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:16px 0}
.kbd{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:.92rem}

/* faq */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:9px 0;padding:2px 14px}
.faq summary{font-weight:600;cursor:pointer;padding:9px 0;color:var(--ink)}
.faq details div{color:var(--ink2);font-size:.95rem;padding:2px 0 12px}

/* note boxes */
.note{border-left:4px solid var(--hi);background:#eef8fc;border-radius:8px;padding:12px 16px;font-size:.93rem;color:#134a63;margin:14px 0}
.warn{border-left:4px solid var(--amber);background:#fdf6e8;border-radius:8px;padding:12px 16px;font-size:.93rem;color:#6b4d0e;margin:14px 0}

/* steps */
.steps{counter-reset:st;display:grid;gap:12px;margin:18px 0}
.step{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px 14px 52px;position:relative}
.step::before{counter-increment:st;content:counter(st);position:absolute;left:14px;top:14px;width:26px;height:26px;border-radius:50%;background:var(--acc);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:.85rem}
.step b{display:block}

/* forms */
.form{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;max-width:760px}
.form label{display:block;font-weight:600;font-size:.9rem;margin:12px 0 4px}
.form input,.form select,.form textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;background:#fff}
.form textarea{min-height:110px}
.form .row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:640px){.form .row2{grid-template-columns:1fr}}
.opt{font-weight:400;color:var(--mut);font-size:.8rem}

/* footer */
.site-foot{background:var(--ink);color:#b7c8d8;margin-top:56px;font-size:.9rem}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:26px;padding:34px 20px 22px}
@media(max-width:860px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.foot-grid{grid-template-columns:1fr}}
.site-foot h4{color:#fff;margin:0 0 8px;font-size:.95rem}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:5px 0}
.site-foot a{color:#9fc3dd}
.foot-bottom{border-top:1px solid #23374d;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:12px 20px 18px;font-size:.8rem;color:#7e93a8}
.wa-float{position:fixed;right:18px;bottom:18px;width:54px;height:54px;background:var(--wa);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 18px rgba(0,0,0,.28);z-index:60}
.wa-float svg{width:30px;height:30px;fill:#fff}
.wa-float:hover{text-decoration:none}

/* misc */
.center{text-align:center}
.small{font-size:.85rem;color:var(--mut)}
.spacer{height:14px}
.download-box{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:18px 0}
.download-box .dl-ico{font-size:1.6rem}
.pill-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.pill{border:1px solid var(--line);background:#fff;border-radius:20px;padding:4px 13px;font-size:.85rem;color:var(--ink2)}
.toc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:18px 0;font-size:.93rem}
.toc a{display:inline-block;margin:2px 14px 2px 0}