/* ===== Hoàng Hà BĐS — shared stylesheet ===== */
:root{
  --bg:#f6f3ec; --surface:#ffffff; --surface-2:#fbf9f4;
  --ink:#15213c; --muted:#5a6178; --line:#e6e0d4;
  --accent:#a9772e; --accent-2:#c69a49; --accent-soft:#f2e8d4;
  --navy:#15213c; --navy-soft:#20304f; --good:#2c7a58;
  --shadow:0 18px 50px -28px rgba(21,33,60,.45);
  --serif:"Lora",Georgia,"Times New Roman",serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --wrap:1100px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0e1424; --surface:#161d31; --surface-2:#1a2338;
    --ink:#edf0f7; --muted:#9aa3ba; --line:#28324c;
    --accent:#d5aa5b; --accent-2:#e4c079; --accent-soft:#2a2214;
    --navy:#0b111f; --navy-soft:#1a2338; --good:#4bb488;
    --shadow:0 20px 55px -30px rgba(0,0,0,.75);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0e1424; --surface:#161d31; --surface-2:#1a2338;
  --ink:#edf0f7; --muted:#9aa3ba; --line:#28324c;
  --accent:#d5aa5b; --accent-2:#e4c079; --accent-soft:#2a2214;
  --navy:#0b111f; --navy-soft:#1a2338; --good:#4bb488;
  --shadow:0 20px 55px -30px rgba(0,0,0,.75);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.18;text-wrap:balance;margin:0}
p{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:20px}
.eyebrow{font-family:var(--sans);font-weight:600;font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;font-family:var(--sans);font-weight:600;font-size:15px;border-radius:999px;padding:12px 22px;line-height:1;transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--accent-2),var(--accent));color:#1b1405;box-shadow:0 10px 24px -12px var(--accent)}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--ink);padding:11px 20px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* ===== Header / Nav ===== */
.site-header{position:sticky;top:0;z-index:100;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px}
.brand{display:flex;align-items:center;gap:11px}
.brand .mono{width:42px;height:42px;flex:0 0 auto;border-radius:50%;background:linear-gradient(145deg,var(--navy-soft),var(--navy));color:var(--accent-2);font-family:var(--serif);font-weight:700;display:grid;place-items:center;font-size:18px;border:1px solid color-mix(in srgb,var(--accent) 45%,transparent)}
.brand b{font-family:var(--sans);font-weight:700;font-size:15px;display:block;line-height:1.15}
.brand span{font-size:11.5px;color:var(--muted);font-weight:500}
.brand a{color:inherit}.brand a:hover{text-decoration:none}
.menu{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.menu>li{position:relative}
.menu>li>a{display:block;padding:10px 14px;color:var(--ink);font-weight:500;font-size:15px;border-radius:8px}
.menu>li>a:hover{background:var(--accent-soft);color:var(--accent);text-decoration:none}
.menu .has-sub>a::after{content:"▾";margin-left:6px;font-size:11px;color:var(--muted)}
.submenu{position:absolute;top:100%;left:0;min-width:230px;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;list-style:none;margin:6px 0 0;opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s ease}
.menu .has-sub:hover .submenu,.menu .has-sub:focus-within .submenu{opacity:1;visibility:visible;transform:translateY(0)}
.submenu a{display:block;padding:9px 12px;border-radius:8px;color:var(--ink);font-size:14.5px}
.submenu a:hover{background:var(--accent-soft);color:var(--accent);text-decoration:none}
.nav-cta{display:inline-flex}
.nav-toggle,.nav-toggle-label{display:none}

@media (max-width:900px){
  .nav-toggle-label{display:inline-flex;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
  .nav-toggle-label span{width:24px;height:2px;background:var(--ink);border-radius:2px}
  .menu{position:fixed;inset:64px 0 auto 0;flex-direction:column;align-items:stretch;gap:2px;background:var(--surface);border-bottom:1px solid var(--line);padding:12px 16px 20px;max-height:0;overflow:hidden;transition:max-height .25s ease;box-shadow:var(--shadow)}
  .nav-toggle:checked~.menu{max-height:80vh;overflow:auto}
  .menu>li>a{padding:12px 8px;border-radius:8px}
  .submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-left:2px solid var(--accent-soft);border-radius:0;margin:0 0 4px 12px;padding:2px 0 2px 8px}
  .menu .has-sub>a::after{float:right}
  .nav-cta{display:none}
}

/* ===== Hero ===== */
.hero{background:radial-gradient(120% 90% at 85% -10%,color-mix(in srgb,var(--accent) 15%,transparent),transparent 55%),linear-gradient(180deg,var(--surface-2),var(--bg))}
.hero .wrap{padding-block:clamp(44px,7vw,80px)}
.hero h1{font-size:clamp(30px,5vw,50px);font-weight:700;letter-spacing:-.4px}
.hero h1 em{font-style:italic;color:var(--accent)}
.hero .lede{color:var(--muted);font-size:clamp(16px,2.3vw,18.5px);max-width:60ch;margin-top:18px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}

/* ===== Sections & general ===== */
section{padding-block:clamp(40px,6vw,72px)}
.section-head{max-width:62ch}
.section-head h2{font-size:clamp(24px,3.6vw,34px);font-weight:700;margin-top:10px}
.section-head p{color:var(--muted);margin-top:12px}
.lead{font-size:clamp(16px,2.2vw,18px);color:var(--muted);max-width:65ch}

/* cards grid */
.grid{display:grid;gap:18px}
.grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:transform .15s ease,box-shadow .15s ease;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card .thumb{aspect-ratio:16/9;display:grid;place-items:center;color:#fff;font-family:var(--serif);font-weight:600;font-size:19px;text-align:center;padding:16px;background:linear-gradient(135deg,var(--navy),var(--navy-soft));position:relative}
.card .thumb .tag{position:absolute;top:12px;left:12px;font-family:var(--sans);font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;background:var(--accent);color:#1b1405;padding:4px 10px;border-radius:999px}
.card .body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card .body h3{font-family:var(--sans);font-weight:700;font-size:17px}
.card .body h3 a{color:var(--ink)}
.card .body h3 a:hover{color:var(--accent)}
.card .meta{font-size:12.5px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}
.card .excerpt{color:var(--muted);font-size:14px}
.card .more{margin-top:auto;font-weight:600;font-size:14px}

/* stat row */
.stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.stat{flex:1;min-width:140px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px;text-align:center}
.stat b{display:block;font-family:var(--serif);font-size:24px}
.stat small{color:var(--muted);font-size:12.5px}

/* feature list */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin-top:30px}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.feature .n{font-family:var(--serif);font-weight:700;color:var(--accent);background:var(--accent-soft);width:34px;height:34px;border-radius:9px;display:grid;place-items:center}
.feature h3{font-family:var(--sans);font-weight:700;font-size:16px;margin-top:13px}
.feature p{color:var(--muted);font-size:14px;margin-top:6px}

/* band */
.band{background:var(--navy);color:#e9edf6}
.band .eyebrow{color:var(--accent-2)}
.band h2{color:#fff}
.band p{color:#c3ccdd}

/* ===== Article / page prose ===== */
.page-hero{background:linear-gradient(180deg,var(--surface-2),var(--bg));border-bottom:1px solid var(--line)}
.page-hero .wrap{padding-block:clamp(34px,5vw,56px)}
.page-hero h1{font-size:clamp(27px,4.2vw,42px);font-weight:700}
.page-hero .lede{color:var(--muted);margin-top:14px;max-width:65ch}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.prose{max-width:72ch;margin-inline:auto}
.prose>*+*{margin-top:18px}
.prose h2{font-size:clamp(21px,3vw,28px);font-weight:700;margin-top:38px}
.prose h3{font-size:clamp(18px,2.4vw,22px);font-weight:700;margin-top:28px}
.prose p,.prose li{font-size:16.5px;color:var(--ink)}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-top:8px}
.prose blockquote{border-left:3px solid var(--accent);background:var(--surface-2);padding:16px 20px;border-radius:0 12px 12px 0;font-family:var(--serif);font-style:italic;color:var(--ink)}
.prose img{border-radius:14px;margin-block:22px}
.prose a{font-weight:500}
.prose strong{color:var(--ink)}
.callout{background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:14px;padding:18px 20px}
.placeholder{display:inline-block;background:repeating-linear-gradient(-45deg,var(--accent-soft),var(--accent-soft) 6px,transparent 6px,transparent 12px);border:1px dashed var(--accent);color:var(--accent);font-weight:600;font-size:12.5px;padding:2px 9px;border-radius:6px}

/* CTA box */
.cta-box{background:radial-gradient(120% 120% at 15% 0%,color-mix(in srgb,var(--accent) 20%,transparent),transparent 50%),linear-gradient(160deg,var(--navy),var(--navy-soft));color:#fff;border-radius:20px;padding:clamp(26px,4vw,44px);text-align:center;margin-block:20px}
.cta-box h2{color:#fff;font-size:clamp(22px,3.4vw,32px)}
.cta-box p{color:#c3ccdd;margin:12px auto 0;max-width:52ch}
.cta-box .phone{font-family:var(--serif);font-weight:700;font-size:clamp(22px,4vw,30px);color:#fff;letter-spacing:1px;margin-top:18px;font-variant-numeric:tabular-nums}
.cta-box .btn{margin-top:18px}

/* contact */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:28px}
.contact-item{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px}
.contact-item b{font-size:15px}
.contact-item p{color:var(--muted);font-size:14.5px;margin-top:6px}
.contact-item .big{font-family:var(--serif);font-size:22px;color:var(--accent);margin-top:6px}

/* ===== Footer ===== */
.site-footer{background:var(--navy);color:#9aa6bd;margin-top:40px;padding-block:36px 24px;border-top:1px solid rgba(255,255,255,.08)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.site-footer h4{font-family:var(--sans);color:#fff;font-size:14px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:14px}
.site-footer a{color:#c3ccdd;font-size:14px}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:9px}
.site-footer .about{font-size:14px;color:#aeb8cd;max-width:38ch}
.site-footer .brand-f{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:18px;font-size:12.5px;color:#8b96ad;text-align:center}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr;gap:22px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}