/* ==========================================================================
   National Current News — telecom reference site
   Design tokens
   ========================================================================== */
:root{
  --ink:#0f2a43;        /* deep navy - primary */
  --ink-2:#16395c;      /* lighter navy */
  --signal:#0fb5c4;     /* signal cyan - accent */
  --signal-d:#0a8c98;   /* darker cyan for text-on-white */
  --amber:#e8930c;      /* watch-out / warning */
  --amber-bg:#fff6e6;
  --paper:#ffffff;
  --surface:#f5f8fb;    /* page bg */
  --surface-2:#eef3f8;  /* zebra / chips */
  --line:#d9e2ec;       /* borders */
  --text:#1f2d3a;       /* body text */
  --muted:#5d6b79;      /* secondary text */
  --radius:12px;
  --radius-sm:8px;
  --maxw:1100px;
  --readw:760px;
  --shadow:0 1px 2px rgba(15,42,67,.06), 0 8px 24px rgba(15,42,67,.06);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--text);
  background:var(--surface);
  line-height:1.7;
  font-size:17px;
}
img{max-width:100%;height:auto}
a{color:var(--signal-d);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- Layout ---- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.read{max-width:var(--readw);margin:0 auto;padding:0 20px}
main{display:block}

/* ---- Header / nav with dropdowns ---- */
.site-header{position:sticky;top:0;z-index:50;background:var(--ink);border-bottom:3px solid var(--signal)}
.nav{max-width:var(--maxw);margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-family:'Sora',sans-serif;font-weight:700;font-size:1.12rem;letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand .dot{width:11px;height:11px;border-radius:50%;background:var(--signal);box-shadow:0 0 0 4px rgba(15,181,196,.25)}

.menu{list-style:none;display:flex;align-items:center;gap:2px;margin:0;padding:0}
.menu > li > a,.sub-toggle{
  display:inline-flex;align-items:center;gap:5px;color:#dbe7f1;font-family:'Inter',sans-serif;
  font-size:.92rem;font-weight:500;padding:9px 12px;border-radius:8px;white-space:nowrap;
  background:none;border:none;cursor:pointer;
}
.menu > li > a:hover,.sub-toggle:hover{background:rgba(255,255,255,.09);color:#fff;text-decoration:none}
.caret{font-size:.7em;opacity:.8;transition:transform .15s ease}
.has-sub{position:relative}
.sub{
  list-style:none;margin:0;padding:6px;position:absolute;top:calc(100% + 6px);left:0;
  min-width:220px;background:#fff;border:1px solid var(--line);border-radius:10px;
  box-shadow:0 10px 30px rgba(15,42,67,.18);display:none;z-index:60;
}
.sub li a{display:block;padding:8px 12px;border-radius:6px;color:var(--text);font-size:.9rem;font-weight:500}
.sub li a:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}
/* desktop reveal on hover / focus */
@media (min-width:881px){
  .has-sub:hover .sub,.has-sub:focus-within .sub{display:block}
  .has-sub:hover .caret{transform:rotate(180deg)}
}
.nav-burger{display:none;cursor:pointer;color:#fff;background:none;padding:8px 10px;border:1px solid rgba(255,255,255,.25);border-radius:8px;font-size:1.05rem;line-height:1}

@media (max-width:880px){
  .nav-burger{display:inline-flex}
  .menu{
    display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;
    gap:0;background:var(--ink);padding:8px 12px 16px;border-bottom:3px solid var(--signal);
    max-height:calc(100vh - 64px);overflow-y:auto;
  }
  .site-header.nav-open .menu{display:flex}
  .menu > li{width:100%}
  .menu > li > a,.sub-toggle{width:100%;justify-content:space-between;padding:12px}
  .sub{position:static;display:none;box-shadow:none;border:none;background:rgba(255,255,255,.06);margin:2px 0 6px;padding:4px}
  .sub li a{color:#dbe7f1;padding:10px 14px}
  .sub li a:hover{background:rgba(255,255,255,.08);color:#fff}
  .has-sub.open .sub{display:block}
  .has-sub.open .caret{transform:rotate(180deg)}
}

/* ---- Hero (home) ---- */
.hero{
  background:linear-gradient(160deg,var(--ink) 0%,var(--ink-2) 100%);
  color:#fff;padding:56px 0 64px;position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-80px;top:-80px;width:340px;height:340px;
  background:radial-gradient(circle,rgba(15,181,196,.35),transparent 70%);
}
.hero .eyebrow{
  color:var(--signal);font-family:'IBM Plex Mono',monospace;font-size:.8rem;
  letter-spacing:.18em;text-transform:uppercase;margin:0 0 14px;
}
.hero h1{
  font-family:'Sora',sans-serif;font-weight:700;font-size:2.5rem;line-height:1.12;
  margin:0 0 16px;letter-spacing:-.02em;max-width:18ch;
}
.hero p{font-size:1.12rem;color:#cfe0ee;margin:0;max-width:54ch}
@media (max-width:640px){.hero h1{font-size:1.95rem}}

/* ---- Sections ---- */
.section{padding:52px 0}
.section h2.sec-title{
  font-family:'Sora',sans-serif;font-weight:700;font-size:1.6rem;
  color:var(--ink);margin:0 0 6px;letter-spacing:-.01em;
}
.section .sec-sub{color:var(--muted);margin:0 0 26px}

/* ---- Card grid (guides) ---- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 28px rgba(15,42,67,.12);text-decoration:none}
.card .kicker{font-family:'IBM Plex Mono',monospace;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--signal-d);margin-bottom:10px}
.card h3{font-family:'Sora',sans-serif;font-size:1.12rem;color:var(--ink);margin:0 0 8px;line-height:1.3}
.card p{font-size:.95rem;color:var(--muted);margin:0 0 14px}
.card .go{margin-top:auto;font-weight:600;font-size:.9rem;color:var(--signal-d)}

/* ---- Operator quick links ---- */
.op-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.op{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:16px;text-align:center;font-weight:600;color:var(--ink);box-shadow:var(--shadow);
}
.op:hover{border-color:var(--signal);text-decoration:none}
.op small{display:block;font-weight:500;color:var(--muted);margin-top:4px;font-size:.78rem}

/* ---- Article ---- */
.article{background:var(--surface);padding:40px 0 56px}
.article .crumb{font-size:.82rem;color:var(--muted);margin:0 auto 18px;max-width:var(--readw);padding:0 20px}
.article .crumb a{color:var(--muted)}
.article-head{max-width:var(--readw);margin:0 auto 10px;padding:0 20px}
.article-head .cat{display:inline-block;background:var(--signal);color:#fff;font-size:.72rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;padding:4px 10px;border-radius:999px;margin-bottom:14px}
.article-head h1{font-family:'Sora',sans-serif;font-weight:700;font-size:2.1rem;line-height:1.18;color:var(--ink);margin:0;letter-spacing:-.02em}
@media (max-width:640px){.article-head h1{font-size:1.6rem}}

.content{max-width:var(--readw);margin:0 auto;padding:0 20px}
.content h2{font-family:'Sora',sans-serif;font-weight:600;font-size:1.4rem;color:var(--ink);margin:2em 0 .5em;letter-spacing:-.01em}
.content h3{font-family:'Sora',sans-serif;font-weight:600;font-size:1.12rem;color:var(--ink-2);margin:1.6em 0 .4em}
.content p{margin:0 0 1.05em}
.content ul,.content ol{margin:0 0 1.2em;padding-left:1.3em}
.content li{margin:.4em 0}
.content strong{color:var(--ink)}
.content a{color:var(--signal-d);font-weight:500}
.content hr{border:none;border-top:1px solid var(--line);margin:2.2em 0 1.2em}
.content hr + p,.content > p > em:only-child{color:var(--muted);font-size:.9rem}
.content hr ~ p em{color:var(--muted);font-size:.9rem}

/* ---- Tables ---- */
.table-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--radius-sm);-webkit-overflow-scrolling:touch}
.content table{border-collapse:collapse;width:100%;min-width:540px;font-size:.92rem;background:var(--paper)}
.content th,.content td{text-align:left;padding:10px 13px;border-bottom:1px solid var(--line);vertical-align:top}
.content thead th{background:var(--ink);color:#fff;font-weight:600;font-size:.84rem;letter-spacing:.01em;white-space:nowrap}
.content thead th strong{color:#fff}
.content tbody tr:nth-child(even){background:var(--surface-2)}
.content tbody tr:hover{background:#e7f6f8}

/* ---- USSD code chips (signature) ---- */
code.ussd{
  font-family:'IBM Plex Mono',monospace;font-size:.86em;font-weight:600;
  background:var(--ink);color:#7fe7f0;padding:2px 7px;border-radius:6px;
  white-space:nowrap;letter-spacing:.02em;
}
.content td code.ussd{background:var(--surface-2);color:var(--ink);border:1px solid var(--line)}

/* ---- Related pages block ---- */
.related{margin:2.6em 0 0;padding:22px;background:var(--paper);border:1px solid var(--line);border-left:3px solid var(--signal);border-radius:0 12px 12px 0;box-shadow:var(--shadow)}
.related h2{font-family:'Sora',sans-serif;font-size:1.05rem;color:var(--ink);margin:0 0 12px}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:6px 22px}
.related li{margin:0}
.related a{display:block;padding:6px 0;font-size:.93rem;font-weight:500;border-bottom:1px solid transparent}
.related a:hover{border-bottom-color:var(--signal)}
@media (max-width:560px){.related ul{grid-template-columns:1fr}}

/* ---- Footer ---- */
.site-footer{background:var(--ink);color:#bcd0e2;padding:46px 0 28px;margin-top:10px}
.foot-top{margin-bottom:28px}
.foot-brand{display:flex;align-items:center;gap:10px;color:#fff;font-family:'Sora',sans-serif;font-weight:700;margin-bottom:8px}
.foot-brand .dot{width:10px;height:10px;border-radius:50%;background:var(--signal)}
.foot-note{font-size:.9rem;color:#8ba6bf;max-width:52ch;margin:0}
.foot-cols{display:grid;grid-template-columns:repeat(6,1fr);gap:22px}
.foot-cols h4{font-family:'Sora',sans-serif;color:#fff;font-size:.76rem;letter-spacing:.07em;text-transform:uppercase;margin:0 0 10px}
.foot-cols a{display:block;color:#bcd0e2;font-size:.86rem;padding:3px 0}
.foot-cols a:hover{color:var(--signal)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:.82rem;color:#7e98b1;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
@media (max-width:900px){.foot-cols{grid-template-columns:repeat(3,1fr)}}
@media (max-width:560px){.foot-cols{grid-template-columns:1fr 1fr}}

/* ---- Misc ---- */
.note-disclaimer{background:var(--amber-bg);border-left:3px solid var(--amber);padding:12px 16px;border-radius:0 8px 8px 0;font-size:.9rem;color:#7a571a;margin:1.4em 0}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px;border-radius:4px}