/* =================================================================
   Subnet Calculator — Anavem
   Complete stylesheet with dark mode support
   ================================================================= */

/* ── Reset & Variables ────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg0:#f8fafc;--bg1:#ffffff;--bg2:#f1f5f9;--bg3:#e2e8f0;
  --tx0:#0f172a;--tx1:#475569;--tx2:#94a3b8;
  --cyan:#06b6d4;--cyan-l:#0891b2;--cyan-d:#0e7490;
  --purple:#8b5cf6;--purple-l:#7c3aed;
  --green:#22c55e;--green-l:#16a34a;
  --red:#ef4444;--red-l:#dc2626;
  --orange:#f97316;
  --brd:#e2e8f0;--brd2:#cbd5e1;
  --crit:#ef4444;--warn:#eab308;--info:#06b6d4;
  --sans:'Inter',ui-sans-serif,system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --hdr-bg:rgba(255,255,255,.95);
  --radius:6px;
}

/* ── Dark Mode ────────────────────────────────────────────────── */
body.dark{
  --bg0:#0f172a;--bg1:#1e293b;--bg2:#1e293b;--bg3:#334155;
  --tx0:#f1f5f9;--tx1:#cbd5e1;--tx2:#64748b;
  --brd:#334155;--brd2:#475569;
  --hdr-bg:rgba(15,23,42,.95);
}
body.dark .lang-btn.on{background:var(--cyan);color:#0f172a}
body.dark .btn-p{background:var(--cyan);color:#0f172a}
body.dark .input-wrap input,.dark .input-wrap select{background:var(--bg0);color:var(--tx0);border-color:var(--brd)}
body.dark .result-card{border-color:var(--brd)}
body.dark .result-card:hover{border-color:var(--brd2)}
body.dark .tab-btn.active{background:var(--cyan);color:#0f172a;border-color:var(--cyan)}
body.dark .ref-table tr:hover{background:rgba(6,182,212,.1)}
body.dark .subnet-table tr:hover{background:rgba(6,182,212,.1)}
body.dark .binary-display{background:var(--bg0);border-color:var(--brd)}
body.dark .badge-private{background:rgba(34,197,94,.15);border-color:rgba(34,197,94,.3)}
body.dark .badge-public{background:rgba(6,182,212,.15);border-color:rgba(6,182,212,.3)}
body.dark .error-msg{background:rgba(239,68,68,.1);border-color:rgba(239,68,68,.3)}
body.dark .info-box{background:rgba(6,182,212,.08);border-color:rgba(6,182,212,.2)}

/* ── Base ─────────────────────────────────────────────────────── */
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg0);color:var(--tx0);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;transition:background .3s,color .3s}
a{color:var(--cyan);text-decoration:none;transition:color .2s}
a:hover{color:var(--cyan-l)}

/* ── Header ───────────────────────────────────────────────────── */
.hdr{position:sticky;top:0;z-index:50;background:var(--hdr-bg);backdrop-filter:blur(16px);border-bottom:1px solid var(--brd);transition:background .3s}
.hdr-top{border-bottom:1px solid var(--brd);background:var(--bg2)}
.hdr-top-in{max-width:1400px;margin:0 auto;padding:0 1.5rem;height:28px;display:flex;align-items:center;justify-content:space-between}
.hdr-top-l{display:flex;align-items:center;gap:.5rem;font-size:.6rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--tx2)}
.hdr-top-l .dot{width:5px;height:5px;border-radius:50%;background:var(--cyan);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.hdr-top-r{display:flex;align-items:center;gap:1rem}
.hdr-top-r a{font-size:.6rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--tx2);transition:color .2s}.hdr-top-r a:hover{color:var(--tx0)}
.hdr-in{max-width:1400px;margin:0 auto;padding:0 1.5rem;height:56px;display:flex;align-items:center;justify-content:space-between}
.hdr-l{display:flex;align-items:center;gap:.75rem}
.logo{font-size:1.35rem;font-weight:900;letter-spacing:-.04em;text-decoration:none}
.logo-g{background:linear-gradient(135deg,var(--cyan),var(--purple));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo-t{color:var(--tx0);-webkit-text-fill-color:var(--tx0)}
.logo:hover .logo-t{color:var(--cyan);-webkit-text-fill-color:var(--cyan)}
.badge{font-size:.55rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--bg1);background:var(--cyan);padding:2px 8px}
.hdr-nav{display:flex;align-items:center;gap:.25rem}
.hdr-nav a{font-size:.8rem;font-weight:600;color:var(--tx1);padding:.4rem .75rem;transition:all .2s;text-decoration:none;display:flex;align-items:center;gap:.35rem}
.hdr-nav a:hover{color:var(--cyan);background:rgba(6,182,212,.06)}
.hdr-nav a svg{width:14px;height:14px}
.hdr-r{display:flex;align-items:center;gap:.5rem}

/* ── Theme Toggle ─────────────────────────────────────────────── */
.btn-theme{background:0;border:1px solid var(--brd);padding:5px;cursor:pointer;color:var(--tx2);display:flex;align-items:center;transition:all .2s}
.btn-theme:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-theme svg{width:16px;height:16px}

/* ── Language Toggle ──────────────────────────────────────────── */
.lang-toggle{display:flex;border:1px solid var(--brd);overflow:hidden}
.lang-btn{font-family:var(--sans);font-size:.65rem;font-weight:800;padding:3px 8px;background:transparent;color:var(--tx2);border:none;cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:.05em}
.lang-btn.on{background:var(--tx0);color:var(--bg0)}
.lang-btn:hover:not(.on){color:var(--tx0)}

/* ── Back Link ────────────────────────────────────────────────── */
.bk{display:flex;align-items:center;gap:.35rem;font-size:.75rem;font-weight:700;color:var(--tx1);transition:color .2s;text-decoration:none}.bk:hover{color:var(--cyan)}
.bk svg{width:16px;height:16px}

/* ── Nav Toggle (mobile) ──────────────────────────────────────── */
.nav-toggle{display:none;background:0;border:1px solid var(--brd);padding:6px;cursor:pointer;color:var(--tx1);align-items:center;justify-content:center;transition:border-color .2s,color .2s}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle svg{display:block}

/* ── Main Container ───────────────────────────────────────────── */
.mc{max-width:1400px;margin:0 auto;padding:1.5rem;width:100%;flex:1}

/* ── Counter Bar ──────────────────────────────────────────────── */
.counter-bar{display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;background:var(--bg2);font-size:.75rem;color:var(--tx2);font-weight:600;transition:background .3s}
.counter-bar strong{color:var(--cyan);font-family:var(--mono);font-weight:800}

/* ── Install Banner (PWA) ─────────────────────────────────────── */
.install-banner{display:none;align-items:center;justify-content:center;gap:.75rem;padding:.6rem 1rem;background:linear-gradient(135deg,var(--cyan),var(--purple));color:#fff;font-size:.8rem;font-weight:600}
.install-banner.v{display:flex}
.install-banner button{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.3);color:#fff;font-size:.75rem;font-weight:700;padding:4px 12px;cursor:pointer}
.install-banner .dismiss{background:0;border:0;color:rgba(255,255,255,.6);cursor:pointer;font-size:1rem}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--sans);font-size:.85rem;font-weight:600;padding:.5rem 1rem;border:1px solid var(--brd);background:0;color:var(--tx0);cursor:pointer;transition:all .2s}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-p{background:var(--cyan);border-color:var(--cyan);color:#fff}.btn-p:hover{background:var(--cyan-l);border-color:var(--cyan-l)}
.btn svg{width:16px;height:16px}
.btn-lg{font-size:.9rem;padding:.65rem 1.5rem}
.btn-sm{font-size:.75rem;padding:.3rem .65rem}

/* ── Page Hero ────────────────────────────────────────────────── */
.hero{text-align:center;padding:2.5rem 1.5rem 2rem}
.hero h1{font-size:2rem;font-weight:900;text-transform:uppercase;letter-spacing:-.02em;margin-bottom:.5rem}
.hero p.sub{color:var(--tx1);margin-bottom:0;max-width:600px;margin-left:auto;margin-right:auto}

/* ── IPv4/IPv6 Tabs ───────────────────────────────────────────── */
.ip-tabs{display:flex;border-bottom:2px solid var(--brd);margin-bottom:1.5rem;overflow-x:auto;-webkit-overflow-scrolling:touch}
.tab-btn{font-family:var(--sans);font-size:.8rem;font-weight:700;padding:.6rem 1.25rem;background:0;border:none;border-bottom:2px solid transparent;margin-bottom:-2px;cursor:pointer;color:var(--tx2);transition:all .2s;white-space:nowrap;display:flex;align-items:center;gap:.4rem}
.tab-btn:hover{color:var(--cyan)}
.tab-btn.active{color:var(--cyan);border-bottom-color:var(--cyan)}
.tab-btn svg{width:15px;height:15px}

/* ── Tab Panels ───────────────────────────────────────────────── */
.tab-panel{display:none}
.tab-panel.active{display:block}

/* ── Calculator Layout ────────────────────────────────────────── */
.calc-layout{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:start}
.calc-col{display:flex;flex-direction:column;gap:1.5rem}

/* ── Input Section ────────────────────────────────────────────── */
.input-section{background:var(--bg1);border:1px solid var(--brd);padding:1.5rem}
.section-title{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--tx2);margin-bottom:1rem;display:flex;align-items:center;gap:.5rem}
.section-title svg{width:14px;height:14px;color:var(--cyan)}
.input-row{display:flex;gap:.75rem;align-items:flex-end;flex-wrap:wrap}
.input-group{display:flex;flex-direction:column;gap:.35rem;flex:1;min-width:140px}
.input-group label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--tx2)}
.input-wrap input,.input-wrap select{width:100%;font-family:var(--mono);font-size:.9rem;padding:.55rem .75rem;border:1px solid var(--brd);background:var(--bg1);color:var(--tx0);transition:border-color .2s}
.input-wrap input:focus,.input-wrap select:focus{outline:none;border-color:var(--cyan)}
.input-wrap input::placeholder{color:var(--tx2);font-family:var(--sans);font-size:.85rem}
.input-wrap{position:relative}
.or-divider{font-size:.75rem;font-weight:600;color:var(--tx2);padding-bottom:.5rem;white-space:nowrap;align-self:flex-end}
.calc-actions{display:flex;gap:.5rem;margin-top:1rem;flex-wrap:wrap}

/* ── Error / Info ─────────────────────────────────────────────── */
.error-msg{display:none;padding:.5rem .75rem;font-size:.8rem;color:#dc2626;background:rgba(239,68,68,.06);border:1px solid rgba(239,68,68,.2);margin-top:.75rem}
.error-msg.v{display:block}
.info-box{padding:.75rem 1rem;font-size:.8rem;color:var(--cyan-d);background:rgba(6,182,212,.06);border:1px solid rgba(6,182,212,.2);margin-bottom:1rem}
.info-box strong{color:var(--tx0)}

/* ── Results Grid ─────────────────────────────────────────────── */
.results-section{background:var(--bg1);border:1px solid var(--brd);padding:1.5rem}
.results-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.result-card{background:var(--bg0);border:1px solid var(--brd);padding:.85rem 1rem;transition:border-color .2s;position:relative}
.result-card:hover{border-color:var(--brd2)}
.result-label{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--tx2);margin-bottom:.3rem}
.result-value{font-family:var(--mono);font-size:.9rem;font-weight:600;color:var(--tx0);word-break:break-all}
.result-value.large{font-size:1.1rem;color:var(--cyan)}
.btn-copy{position:absolute;top:.5rem;right:.5rem;background:0;border:1px solid var(--brd);padding:3px 7px;cursor:pointer;color:var(--tx2);font-size:.65rem;font-weight:700;display:flex;align-items:center;gap:.2rem;transition:all .2s}
.btn-copy:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-copy.copied{color:var(--green);border-color:var(--green)}
.btn-copy svg{width:11px;height:11px}
.result-card.full{grid-column:1/-1}
.result-card.accent{border-left:3px solid var(--cyan)}
.result-card.accent-green{border-left:3px solid var(--green)}
.result-card.accent-purple{border-left:3px solid var(--purple)}

/* ── Badges ───────────────────────────────────────────────────── */
.badge-private{display:inline-flex;align-items:center;gap:.3rem;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:2px 8px;background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.25);color:#16a34a}
.badge-public{display:inline-flex;align-items:center;gap:.3rem;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:2px 8px;background:rgba(6,182,212,.1);border:1px solid rgba(6,182,212,.25);color:var(--cyan-d)}
.badge-class{display:inline-block;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:2px 8px;background:rgba(139,92,246,.1);border:1px solid rgba(139,92,246,.25);color:var(--purple-l)}
.badge-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}
.badge-dot.green{background:var(--green)}
.badge-dot.blue{background:var(--cyan)}

/* ── Binary Display ───────────────────────────────────────────── */
.binary-display{background:var(--bg2);border:1px solid var(--brd);padding:1rem;font-family:var(--mono);font-size:.8rem;line-height:2;overflow-x:auto}
.binary-row{display:flex;align-items:center;gap:.75rem;white-space:nowrap}
.binary-label{min-width:90px;font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--tx2)}
.binary-val{color:var(--tx0)}
.binary-val .oct{display:inline-block;padding:0 .15em}
.binary-val .oct:not(:last-child){border-right:1px solid var(--brd2);margin-right:.15em}
.binary-val .b1{color:var(--cyan)}
.binary-val .b0{color:var(--tx2)}
.binary-sep{color:var(--brd2);margin:0 .1em}

/* ── Subnet Divider ───────────────────────────────────────────── */
.divider-section{background:var(--bg1);border:1px solid var(--brd);padding:1.5rem}
.divider-controls{display:flex;gap:.75rem;align-items:flex-end;flex-wrap:wrap;margin-bottom:1rem}
.divider-controls .input-group{max-width:200px}
.subnet-table-wrap{overflow-x:auto;border:1px solid var(--brd)}
.subnet-table{width:100%;border-collapse:collapse;font-size:.825rem}
.subnet-table th{background:var(--bg2);padding:.6rem .75rem;text-align:left;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--tx1);border-bottom:1px solid var(--brd);white-space:nowrap}
.subnet-table td{padding:.5rem .75rem;border-bottom:1px solid var(--brd);font-family:var(--mono);font-size:.8rem;color:var(--tx1)}
.subnet-table td:first-child{color:var(--purple-l);font-weight:700}
.subnet-table tbody tr:hover{background:rgba(6,182,212,.05)}
.subnet-table tbody tr:last-child td{border-bottom:none}
.subnet-table-empty{padding:2rem;text-align:center;color:var(--tx2);font-size:.85rem}

/* ── Quick Reference Table ────────────────────────────────────── */
.ref-section{background:var(--bg1);border:1px solid var(--brd);padding:1.5rem}
.ref-table-wrap{overflow-x:auto;border:1px solid var(--brd)}
.ref-table{width:100%;border-collapse:collapse;font-size:.825rem}
.ref-table th{background:var(--bg2);padding:.6rem .75rem;text-align:left;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--tx1);border-bottom:1px solid var(--brd);white-space:nowrap}
.ref-table td{padding:.5rem .75rem;border-bottom:1px solid var(--brd);font-family:var(--mono);font-size:.8rem;color:var(--tx1)}
.ref-table td:first-child{color:var(--cyan-d);font-weight:700}
.ref-table tr:hover{background:rgba(6,182,212,.05)}
.ref-table tr:last-child td{border-bottom:none}
.ref-table .highlight-row td{background:rgba(6,182,212,.06);font-weight:600}

/* ── IPv6 Results ─────────────────────────────────────────────── */
.ipv6-results{display:flex;flex-direction:column;gap:.75rem}
.ipv6-card{background:var(--bg0);border:1px solid var(--brd);padding:.85rem 1rem;position:relative}
.ipv6-card:hover{border-color:var(--brd2)}
.ipv6-label{font-size:.65rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--tx2);margin-bottom:.3rem}
.ipv6-value{font-family:var(--mono);font-size:.85rem;font-weight:600;color:var(--tx0);word-break:break-all}

/* ── Ad Units ─────────────────────────────────────────────────── */
.ad-unit{margin:1.5rem 0;min-height:90px;overflow:hidden}

/* ── SEO Text ─────────────────────────────────────────────────── */
.seo-text{max-width:900px;margin:0 auto;padding:1rem 0}
.seo-text p{font-size:.85rem;color:var(--tx1);line-height:1.7;margin-bottom:.75rem}
.seo-text p:last-child{margin-bottom:0}

/* ── Footer ───────────────────────────────────────────────────── */
.ft{border-top:1px solid var(--brd);margin-top:auto;transition:border-color .3s}
.ft-in{max-width:1400px;margin:0 auto;padding:1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem}
.ft-c{font-size:.8rem;color:var(--tx2)}
.ft-l{display:flex;gap:1.5rem;list-style:none}
.ft-l a{font-size:.8rem;color:var(--tx2);transition:color .2s}.ft-l a:hover{color:var(--cyan)}

/* ── Utility ──────────────────────────────────────────────────── */
.hidden{display:none!important}
.mono{font-family:var(--mono)}
.text-cyan{color:var(--cyan)}
.text-green{color:var(--green)}
.text-red{color:var(--red)}
.text-tx2{color:var(--tx2)}
@keyframes mIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.anim-in{animation:mIn .2s ease-out}

/* ── Dropdown nav when open on mobile ───────────────────────────── */
@media(max-width:1024px){
  .hdr-nav.open{display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:var(--hdr-bg);backdrop-filter:blur(16px);border-bottom:2px solid var(--cyan);padding:.5rem 0;z-index:200;animation:mIn .15s ease-out}
  .hdr-nav.open a{padding:.65rem 1.25rem;font-size:.85rem;border-bottom:1px solid var(--brd)}
  .hdr-nav.open a:last-child{border-bottom:none}
}

/* ── Responsive: Tablet ───────────────────────────────────────── */
@media(max-width:1024px){
  .hdr-top{display:none}
  .hdr-nav{display:none}
  .hdr{position:sticky;top:0}
  .nav-toggle{display:inline-flex}
  .hdr-in{height:48px;position:relative}
  .hero{padding:2rem 1rem 1.5rem}
  .hero h1{font-size:1.5rem}
  .calc-layout{grid-template-columns:1fr}
  .results-grid{grid-template-columns:1fr 1fr}
  .ft-in{flex-direction:column;text-align:center;padding:1rem}
  .ft-l{gap:1rem}
  .bk span{display:none}
  .calc-actions{flex-wrap:wrap}
  .divider-controls{flex-wrap:wrap}
}

/* ── Responsive: Phone ────────────────────────────────────────── */
@media(max-width:640px){
  .hdr-in{padding:0 .75rem;height:48px}
  .mc{padding:.75rem}
  .logo{font-size:1.1rem}
  .badge{font-size:.6rem;padding:1px 6px}
  .hero{padding:1.5rem .75rem 1rem}
  .hero h1{font-size:1.25rem}
  .results-grid{grid-template-columns:1fr}
  .input-row{flex-direction:column;gap:.5rem}
  .or-divider{display:none}
  .input-group{min-width:0;width:100%}
  .counter-bar{font-size:.7rem;padding:.2rem .75rem}
  .ip-tabs{gap:0}
  .tab-btn{font-size:.75rem;padding:.5rem .75rem}
  .divider-controls .input-group{max-width:100%}
}

@media(max-width:360px){
  .lang-toggle{display:none}
}