/* The Language Architect: blueprint style. No external fonts, no frameworks. */
:root{
  --ink:#1F5F63;        /* deep teal: text and headings */
  --ink-dark:#17474B;   /* dark background */
  --ink-soft:#365C5F;
  --bg:#FBF6E9;         /* page background: cream. Switch to #EBDDC8 (beige) here */
  --paper:var(--bg);
  --paper-2:#F3EBD3;
  --brown-deep:#6B4A33; /* text, buttons */
  --brown:#A67C5B;      /* accents (decorative, not for small text) */
  --brown-light:#D2B393;/* borders */
  --beige:#EBDDC8;
  --white:#FFFDF8;
  --line:var(--brown-light);
  --blue:#176267;       /* links and small labels, AA on cream and beige */
  --blue-dark:#17474B;
  --teal:#2F8F8B;
  --green:#3E7A55;
  --pink:#D9A3A0;
  --sky:#9ED3CC;        /* light teal for use on dark */
  --amber:#F2D98B;      /* butter yellow */
  --amber-dark:#D9A3A0; /* decorative accent: dusty pink */
  --gold:#B8912B;
  --radius:8px;
  --max:68rem;
  --serif:"Fraunces","Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:"Nunito",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
@font-face{font-family:"Fraunces";src:url(/fonts/fraunces.woff2) format("woff2");font-weight:400 800;font-style:normal;font-display:swap}
@font-face{font-family:"Nunito";src:url(/fonts/nunito.woff2) format("woff2");font-weight:400 800;font-style:normal;font-display:swap}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;font-family:var(--sans);font-size:1.1rem;line-height:1.65;color:var(--ink);background:var(--bg)}
img,svg{max-width:100%;height:auto}
h1,h2,h3{font-family:var(--serif);line-height:1.15;color:var(--ink);margin:0 0 .6em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5.5vw,3.6rem)}
h2{font-size:clamp(1.6rem,3.4vw,2.2rem)}
h3{font-size:1.3rem}
p{margin:0 0 1em}
a{color:var(--blue);text-underline-offset:.18em}
a:hover{color:var(--blue-dark)}
:focus-visible{outline:3px solid var(--ink-dark);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink-dark);color:#fff;padding:.7rem 1rem;z-index:100}
.skip:focus{left:0}
.wrap{width:min(100% - 2.5rem,var(--max));margin-inline:auto}
.narrow{width:min(100% - 2.5rem,44rem);margin-inline:auto}

/* Header */
.site-header{background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 0;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;color:var(--brown-deep);font-family:var(--serif);font-weight:700;font-size:1.2rem;line-height:1.1}
.brand img{height:3rem;width:auto;display:block}
.brand-name{display:block}
.nav{display:flex;align-items:center;gap:.25rem 1.25rem;flex-wrap:wrap}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:.25rem 1.1rem;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;padding:.35rem 0;border-bottom:2px solid transparent;font-weight:500}
.nav a:hover{border-bottom-color:var(--teal)}
.nav a[aria-current="page"]{border-bottom-color:var(--brown)}
.lang{display:flex;border:1px solid var(--ink);border-radius:999px;overflow:hidden;font-family:var(--mono);font-size:.85rem}
.lang a,.lang span{padding:.25rem .6rem;border:0;text-decoration:none;line-height:1.4}
.lang span{background:var(--ink-dark);color:#fff}
.lang a{color:var(--ink);font-weight:600}
.lang a:hover{background:var(--paper-2)}
.menu-btn{display:none;font:inherit;background:none;border:1px solid var(--ink);border-radius:999px;color:var(--ink);padding:.35rem .9rem;cursor:pointer}
@media (max-width:48rem){
  .js .menu-btn{display:inline-block}
  .js .nav{display:none;width:100%;flex-direction:column;align-items:flex-start;padding:.5rem 0 1rem}
  .js .nav.open{display:flex}
  .js .nav ul{flex-direction:column;width:100%}
  .js .nav li a{display:block;padding:.6rem 0}
}

/* Blueprint surfaces */
.grid-bg{
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(31,95,99,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(31,95,99,.08) 1px,transparent 1px),
    linear-gradient(rgba(31,95,99,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(31,95,99,.045) 1px,transparent 1px);
  background-size:96px 96px,96px 96px,24px 24px,24px 24px;
}
.dark{
  background-color:var(--ink-dark);color:#FBF6E9;
  background-image:
    linear-gradient(rgba(158,211,204,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(158,211,204,.14) 1px,transparent 1px),
    linear-gradient(rgba(158,211,204,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(158,211,204,.06) 1px,transparent 1px);
  background-size:96px 96px,96px 96px,24px 24px,24px 24px;
}
.dark h1,.dark h2,.dark h3{color:#fff}
.dark a:not(.btn){color:var(--sky)}
.fig{font-family:var(--mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--blue);margin:0 0 .9rem;display:flex;align-items:center;gap:.6rem}
.fig::before{content:"";width:1.6rem;border-top:2px solid var(--brown)}
.dark .fig{color:var(--sky)}

/* Sections */
section{padding:clamp(3rem,7vw,5.5rem) 0}
.hero{padding:clamp(3rem,8vw,6rem) 0;border-bottom:1px solid var(--line)}
.hero-in{display:grid;gap:2.5rem;align-items:center}
@media (min-width:56rem){.hero-in{grid-template-columns:1.15fr .85fr}}
.lead{font-size:1.25rem;color:var(--ink-soft);max-width:36rem}
.actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.6rem}
.btn{display:inline-block;font:inherit;font-weight:700;text-decoration:none;padding:.8rem 1.4rem;border-radius:999px;border:2px solid var(--ink-dark);cursor:pointer;line-height:1.2}
.btn-primary{background:var(--brown-deep);color:#FBF6E9;border-color:var(--brown-deep)}
.btn-primary:hover{background:#573A27;border-color:#573A27;color:#fff}
.dark .btn-primary{background:var(--amber);color:var(--ink-dark);border-color:var(--amber)}
.dark .btn-primary:hover{background:#E9CB6A;border-color:#E9CB6A;color:var(--ink-dark)}
.btn-ghost{background:transparent;color:var(--brown-deep);border-color:var(--brown-deep)}
.btn-ghost:hover{background:var(--paper-2);color:var(--brown-deep)}
.dark .btn{border-color:var(--amber)}
.dark .btn-ghost{color:#fff;border-color:var(--amber)}
.dark .btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff}
.plate{background:var(--ink-dark);border:2px solid var(--ink-dark);border-radius:var(--radius);padding:1rem;box-shadow:8px 8px 0 var(--pink)}
.plate svg{display:block;width:100%}

.strip{background:var(--ink-dark);color:#FBF6E9;padding:2.2rem 0}
.strip p{margin:0;font-family:var(--serif);font-size:clamp(1.2rem,2.6vw,1.6rem);line-height:1.4;max-width:46rem}
.strip strong{color:var(--amber)}

/* Steps */
.steps{list-style:none;margin:2rem 0 0;padding:0;display:grid;gap:1.25rem;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));counter-reset:none}
.step{position:relative;background:var(--white);border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:var(--radius);padding:1.4rem 1.3rem}
.step .n{font-family:var(--mono);font-size:.85rem;color:var(--blue);letter-spacing:.1em;display:block;margin-bottom:.4rem}
.step h3{margin-bottom:.4em}
.step p{margin:0;color:var(--ink-soft)}

/* Cards */
.cards{display:grid;gap:1.25rem;grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));margin-top:2rem}
.card{position:relative;background:var(--white);border:1px solid var(--line);padding:1.5rem;border-radius:var(--radius);display:flex;flex-direction:column}
.card::before,.card::after{content:"";position:absolute;width:12px;height:12px;border:2px solid var(--brown)}
.card::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.card::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.card p{color:var(--ink-soft)}
.card .more{margin-top:auto;font-weight:700}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{text-decoration:underline}
.tag{font-family:var(--mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;color:var(--blue)}

.who{list-style:none;padding:0;margin:2rem 0 0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(16rem,1fr))}
.who li{padding:1.1rem 1.2rem 1.1rem 1.4rem;border-left:4px solid var(--brown);background:var(--white);border-radius:0 var(--radius) var(--radius) 0;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.who strong{display:block;font-family:var(--serif);font-size:1.15rem;margin-bottom:.2rem}
.who span{color:var(--ink-soft)}

.alt{background:var(--paper-2);border-block:1px solid var(--line)}
.cta{text-align:center}
.cta .narrow p{color:#E4EFE9;font-size:1.15rem}
.cta .actions{justify-content:center}

/* Inner pages */
.page-head{padding:clamp(2.5rem,6vw,4.5rem) 0;border-bottom:1px solid var(--line)}
.page-head p.lead{margin-bottom:0}
.prose h2{margin-top:2.2rem}
.prose ul,.prose ol{padding-left:1.3rem;margin:0 0 1.2rem}
.prose li{margin-bottom:.4rem}
.placeholder{display:block;border:2px dashed var(--gold);background:#FFF6D9;color:#4F3B06;border-radius:var(--radius);padding:.9rem 1.1rem;margin:0 0 1.2rem;font-family:var(--mono);font-size:.95rem}
span.placeholder{display:inline-block;padding:.05rem .4rem;margin:0;border-width:1px}
.about-grid{display:grid;gap:2.5rem}
@media (min-width:52rem){.about-grid{grid-template-columns:16rem 1fr}}
.about-logo{display:block;width:100%;max-width:16rem;height:auto;background:var(--bg);padding:.6rem;border:2px solid var(--brown-deep);border-radius:var(--radius);box-shadow:8px 8px 0 var(--pink)}
.principles{list-style:none;padding:0;margin:1.5rem 0 0;display:grid;gap:1rem}
.principles li{padding-left:1rem;border-left:3px solid var(--brown)}
.principles strong{font-family:var(--serif);font-size:1.15rem;display:block}
.svc{display:grid;gap:1rem 2.5rem;padding:2rem 0;border-top:1px solid var(--line)}
.svc:first-of-type{border-top:0}
@media (min-width:52rem){.svc{grid-template-columns:1fr 2fr}}
.svc dl{margin:0 0 1rem}
.svc dt{font-family:var(--mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);margin-top:.8rem}
.svc dd{margin:0}
.post-meta{font-family:var(--mono);font-size:.8rem;color:var(--ink-soft);letter-spacing:.06em;text-transform:uppercase}
.article{font-size:1.15rem}
.article h2{margin-top:2rem}
.callout{background:var(--white);border:1px solid var(--line);border-left:4px solid var(--brown);padding:1.2rem 1.4rem;border-radius:0 var(--radius) var(--radius) 0;margin:1.8rem 0}
.callout p:last-child,.callout ol:last-child{margin-bottom:0}
.note{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem 1.4rem}

/* Form */
form{display:grid;gap:1.1rem;margin-top:1rem}
label{font-weight:600;display:block;margin-bottom:.3rem}
input,select,textarea{width:100%;font:inherit;color:var(--ink);background:var(--white);border:1.5px solid var(--ink-soft);border-radius:var(--radius);padding:.7rem .8rem}
textarea{min-height:9rem;resize:vertical}
.form-status{min-height:1.5rem;font-weight:600;color:var(--blue-dark)}
.contact-grid{display:grid;gap:2.5rem}
@media (min-width:52rem){.contact-grid{grid-template-columns:1fr 1.2fr}}
.bigmail{font-family:var(--serif);font-size:1.4rem;word-break:break-word}

/* Footer */
.site-footer{background:var(--ink-dark);color:#E4EFE9;padding:3rem 0 2rem;font-size:.98rem}
.site-footer a{color:#fff}
.foot{display:grid;gap:2rem}
@media (min-width:48rem){.foot{grid-template-columns:1.4fr 1fr 1fr}}
.site-footer h2{font-size:.8rem;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--sky);margin-bottom:.8rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.35rem}
.fine{border-top:1px solid rgba(158,211,204,.3);margin-top:2rem;padding-top:1.2rem;font-size:.88rem}
.error-page{text-align:center;min-height:60vh;display:grid;align-items:center}
.error-page .code{font-family:var(--mono);color:var(--blue);letter-spacing:.2em}

.foot-logo{display:block;width:min(100%,15rem);height:auto;margin-bottom:1rem;border-radius:var(--radius)}
.site-footer .brand{display:none}
@media (max-width:30rem){.brand-name{font-size:1.05rem}.brand img{height:2.6rem}}
/* Hero headline: one sentence per line; a sentence wraps only if the screen is too narrow */
.h1-line{display:block;text-wrap:balance}
@media (max-width:26rem){h1{font-size:clamp(1.9rem,8.6vw,2.2rem)}}
/* Vietnamese hero sentences are longer: smaller size so each sentence can sit on one line on desktop */
@media (min-width:56rem){html[lang="vi"] .hero h1{font-size:clamp(2rem,3.1vw,2.5rem)}}