/*
Theme Name: NAN Verse Detector
Theme URI: https://aivideodetector.site/
Author: NAN
Author URI: https://aivideodetector.site/
Description: Custom premium dark theme for NAN Verse .AI — the free AI video detector. Built around the detector tool: drag-drop upload, animated heuristic scan, verdict meter, trust badges, how-it-works, SEO FAQ with schema. Vanilla CSS/JS, no frameworks, no jQuery, mobile-first responsive.
Version: 1.0.1
Requires at least: 6.0
Tested up to: 6.8
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: nida-verse-detector
Tags: dark, detector, ai, tool, responsive, custom-menu, featured-images, one-column
*/

/* ============ 1. DESIGN TOKENS ============ */
:root{
  --bg-950:#04060d;
  --bg-900:#070b16;
  --bg-850:#0a101f;
  --panel:#0c1326;
  --panel-2:#101a33;
  --cyan:#22d3ee;
  --cyan-soft:rgba(34,211,238,.12);
  --violet:#a78bfa;
  --violet-soft:rgba(167,139,250,.12);
  --magenta:#f472b6;
  --ink:#eef2ff;
  --muted:#9aa6c4;
  --muted-2:#6b7694;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.05);
  --ok:#34d399;
  --warn:#fbbf24;
  --bad:#f87171;
  --radius:20px;
  --radius-sm:12px;
  --font-head:'Space Grotesk',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-body:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --grad:linear-gradient(135deg,#22d3ee 0%,#a78bfa 55%,#f472b6 100%);
  --shadow:0 24px 70px rgba(0,0,0,.55);
  --glass:rgba(255,255,255,.045);
}

/* ============ 2. RESET / BASE ============ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  background:var(--bg-950);
  color:var(--ink);
  line-height:1.65;
  font-size:16.5px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 500px at 12% -4%,rgba(34,211,238,.10),transparent 60%),
    radial-gradient(800px 520px at 88% 8%,rgba(167,139,250,.12),transparent 60%),
    radial-gradient(700px 600px at 50% 110%,rgba(244,114,182,.07),transparent 60%),
    var(--bg-950);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{color:#7ee7f7}
h1,h2,h3,h4{font-family:var(--font-head);line-height:1.18;letter-spacing:-.02em}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
section{padding:84px 0}
::selection{background:rgba(34,211,238,.35)}

/* ============ 3. HEADER ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(4,6,13,.78);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-2);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);font-family:var(--font-head);font-weight:700;font-size:1.22rem}
.brand-mark{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  background:var(--grad);font-size:1.15rem;box-shadow:0 6px 22px rgba(34,211,238,.35);
}
.brand em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;gap:30px;list-style:none}
.nav a{color:var(--muted);font-weight:500;font-size:.95rem;transition:color .2s}
.nav a:hover{color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-family:var(--font-head);font-weight:600;font-size:1rem;
  padding:13px 28px;border-radius:14px;border:0;cursor:pointer;
  background:var(--grad);color:#04060d;transition:transform .18s,box-shadow .18s;
  box-shadow:0 10px 30px rgba(34,211,238,.28);
}
.btn:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(167,139,250,.38);color:#04060d}
.btn-ghost{
  background:var(--glass);color:var(--ink);border:1px solid var(--line);
  box-shadow:none;
}
.btn-ghost:hover{border-color:var(--cyan);color:var(--ink);box-shadow:none}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;color:var(--ink);font-size:1.3rem;padding:7px 12px;cursor:pointer}

/* ============ 4. HERO ============ */
.hero{padding:96px 0 60px;text-align:center;position:relative}
.hero-pill{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.82rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan);border:1px solid rgba(34,211,238,.35);border-radius:999px;
  padding:8px 18px;margin-bottom:26px;background:var(--cyan-soft);
}
.hero h1{font-size:clamp(2.3rem,5.4vw,3.9rem);max-width:880px;margin:0 auto 20px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:var(--muted);font-size:1.16rem;max-width:680px;margin:0 auto 34px}
.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:44px}
.hero-stats{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.stat{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px 26px;min-width:150px;backdrop-filter:blur(8px);
}
.stat b{display:block;font-family:var(--font-head);font-size:1.35rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:.82rem;color:var(--muted)}

/* ============ 5. DETECTOR ============ */
.detector-section{padding-top:20px}
.detector-card{
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.015));
  border:1px solid var(--line);border-radius:26px;padding:38px;
  box-shadow:var(--shadow);backdrop-filter:blur(12px);position:relative;overflow:hidden;
}
.detector-card::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background:radial-gradient(600px 260px at 50% -40px,rgba(34,211,238,.14),transparent 70%);
}
.dropzone{
  border:2px dashed rgba(34,211,238,.4);border-radius:var(--radius);
  padding:52px 24px;text-align:center;cursor:pointer;position:relative;
  transition:border-color .2s,background .2s;background:rgba(34,211,238,.03);
}
.dropzone:hover,.dropzone.drag{border-color:var(--cyan);background:rgba(34,211,238,.08)}
.dropzone .dz-icon{font-size:3rem;margin-bottom:14px}
.dropzone h3{font-size:1.35rem;margin-bottom:8px}
.dropzone p{color:var(--muted);font-size:.95rem}
.dropzone input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer}
.file-chip{
  display:none;align-items:center;gap:12px;margin:18px auto 0;max-width:560px;
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:12px 18px;font-size:.95rem;
}
.file-chip.show{display:flex}
.file-chip .fname{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-chip .fsize{color:var(--muted);font-size:.85rem}
.file-chip button{background:none;border:0;color:var(--muted-2);font-size:1.2rem;cursor:pointer}
.scan-row{display:flex;gap:14px;justify-content:center;margin-top:24px;flex-wrap:wrap}
.scan-note{text-align:center;color:var(--muted-2);font-size:.85rem;margin-top:14px}
/* scan progress */
.scan-progress{display:none;margin-top:30px}
.scan-progress.show{display:block}
.stage{display:flex;align-items:center;gap:14px;padding:11px 4px;color:var(--muted-2);font-size:.98rem;transition:color .3s}
.stage .dot{width:30px;height:30px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:.8rem;flex:none;transition:all .3s}
.stage.active{color:var(--ink)}
.stage.active .dot{border-color:var(--cyan);box-shadow:0 0 14px rgba(34,211,238,.5);animation:pulse 1.1s infinite}
.stage.done{color:var(--muted)}
.stage.done .dot{border-color:var(--ok);background:rgba(52,211,153,.15);color:var(--ok)}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.14)}}
.progressbar{height:8px;background:rgba(255,255,255,.07);border-radius:99px;margin-top:16px;overflow:hidden}
.progressbar i{display:block;height:100%;width:0;background:var(--grad);border-radius:99px;transition:width .5s ease}
/* result */
.scan-result{display:none;margin-top:30px;text-align:center}
.scan-result.show{display:block;animation:fadeUp .5s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.verdict-meter{width:190px;height:190px;margin:6px auto 18px;position:relative}
.verdict-meter svg{transform:rotate(-90deg)}
.verdict-num{position:absolute;inset:0;display:grid;place-content:center;text-align:center}
.verdict-num b{font-family:var(--font-head);font-size:2.5rem}
.verdict-num span{font-size:.8rem;color:var(--muted)}
.verdict-label{font-family:var(--font-head);font-size:1.5rem;margin-bottom:8px}
.verdict-label.ai{color:var(--magenta)}
.verdict-label.human{color:var(--ok)}
.verdict-label.unsure{color:var(--warn)}
.verdict-sub{color:var(--muted);max-width:560px;margin:0 auto 22px;font-size:.98rem}
.signal-bars{max-width:560px;margin:0 auto 24px;text-align:left}
.signal{margin-bottom:12px}
.signal .s-top{display:flex;justify-content:space-between;font-size:.88rem;margin-bottom:6px}
.signal .s-top span:last-child{color:var(--muted)}
.signal .bar{height:7px;background:rgba(255,255,255,.07);border-radius:99px;overflow:hidden}
.signal .bar i{display:block;height:100%;background:var(--grad);border-radius:99px;width:0;transition:width .8s ease}
.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.disclaimer{margin-top:20px;font-size:.8rem;color:var(--muted-2);max-width:620px;margin-left:auto;margin-right:auto}
.error-box{display:none;margin-top:22px;background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.4);color:#fca5a5;border-radius:var(--radius-sm);padding:14px 20px;text-align:center}
.error-box.show{display:block}

/* ============ 6. TRUST BADGES ============ */
.badges{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:64px}
.badge{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 22px;text-align:center;backdrop-filter:blur(8px);
  transition:transform .2s,border-color .2s;
}
.badge:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.4)}
.badge .b-icon{font-size:2.1rem;margin-bottom:12px}
.badge h3{font-size:1.02rem;margin-bottom:8px}
.badge p{color:var(--muted);font-size:.9rem}

/* ============ 7. SECTION HEADINGS / STEPS ============ */
.sec-head{text-align:center;max-width:680px;margin:0 auto 52px}
.sec-kicker{color:var(--violet);font-weight:700;font-size:.82rem;letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px}
.sec-head h2{font-size:clamp(1.7rem,3.6vw,2.5rem);margin-bottom:14px}
.sec-head p{color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:36px 30px;position:relative;overflow:hidden;
}
.step .s-num{
  font-family:var(--font-head);font-size:3.4rem;font-weight:700;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.85;
}
.step h3{margin:16px 0 10px;font-size:1.22rem}
.step p{color:var(--muted);font-size:.97rem}
.signals-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.signal-card{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px}
.signal-card .b-icon{font-size:1.9rem;margin-bottom:12px}
.signal-card h3{font-size:1.1rem;margin-bottom:8px}
.signal-card p{color:var(--muted);font-size:.94rem}

/* ============ 8. FAQ ============ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--glass);border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden}
.faq-q{
  width:100%;background:none;border:0;color:var(--ink);text-align:left;cursor:pointer;
  font-family:var(--font-head);font-weight:600;font-size:1.04rem;
  padding:20px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq-q .fi{flex:none;width:30px;height:30px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;font-size:1.1rem;transition:transform .25s,color .25s}
.faq-item.open .fi{transform:rotate(45deg);color:var(--cyan);border-color:var(--cyan)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 24px 22px;color:var(--muted);font-size:.97rem}

/* ============ 9. BLOG CARDS ============ */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:transform .2s,border-color .2s;display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-5px);border-color:rgba(167,139,250,.45)}
.card-body{padding:26px;display:flex;flex-direction:column;flex:1}
.card-cat{font-size:.76rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--violet);margin-bottom:10px}
.card h3{font-size:1.14rem;margin-bottom:10px}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--cyan)}
.card p{color:var(--muted);font-size:.93rem;flex:1}
.card-meta{margin-top:16px;font-size:.82rem;color:var(--muted-2)}
.sec-cta{text-align:center;margin-top:40px}

/* ============ 10. PAGE / SINGLE / ARCHIVE ============ */
.page-hero{padding:70px 0 30px;text-align:center}
.page-hero h1{font-size:clamp(2rem,4.5vw,3rem);margin-bottom:14px}
.page-hero p{color:var(--muted);max-width:640px;margin:0 auto}
.prose{max-width:780px;margin:0 auto;padding:20px 0 70px}
.prose h2{font-size:1.6rem;margin:38px 0 14px}
.prose h3{font-size:1.25rem;margin:30px 0 10px}
.prose p{margin-bottom:18px;color:#c6cde2}
.prose ul,.prose ol{margin:0 0 20px 24px;color:#c6cde2}
.prose li{margin-bottom:8px}
.prose blockquote{border-left:3px solid var(--cyan);padding:8px 0 8px 20px;margin:24px 0;color:var(--muted);font-style:italic}
.post-meta{color:var(--muted-2);font-size:.88rem;margin-bottom:26px}
.post-meta a{color:var(--muted)}
.archive-head{padding:60px 0 10px;text-align:center}
.archive-head h1{font-size:2.2rem}
.archive-head p{color:var(--muted)}
.pagination{display:flex;gap:10px;justify-content:center;margin:44px 0 70px}
.pagination a,.pagination span{border:1px solid var(--line);border-radius:10px;padding:9px 17px;color:var(--muted);font-size:.92rem}
.pagination .current{background:var(--grad);color:#04060d;border:0;font-weight:700}
.search-form{display:flex;gap:10px;max-width:520px;margin:26px auto 0}
.search-form input{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:12px;color:var(--ink);padding:13px 18px;font-size:1rem}
.search-form button{background:var(--grad);border:0;border-radius:12px;padding:13px 24px;font-family:var(--font-head);font-weight:700;cursor:pointer;color:#04060d}
.tool-cta{
  background:linear-gradient(135deg,rgba(34,211,238,.12),rgba(167,139,250,.12));
  border:1px solid var(--line);border-radius:var(--radius);padding:44px;text-align:center;margin:30px 0 60px;
}
.tool-cta h2{margin-bottom:12px}
.tool-cta p{color:var(--muted);margin-bottom:24px}

/* ============ 11. FOOTER ============ */
.site-footer{border-top:1px solid var(--line-2);background:rgba(4,6,13,.7);padding:64px 0 30px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;margin-bottom:44px}
.footer-grid p{color:var(--muted);font-size:.92rem;margin-top:14px;max-width:300px}
.footer-grid h4{font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted-2);margin-bottom:16px}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:10px}
.footer-grid ul a{color:var(--muted);font-size:.93rem}
.footer-grid ul a:hover{color:var(--cyan)}
.footer-bottom{border-top:1px solid var(--line-2);padding-top:26px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted-2);font-size:.85rem}

/* ============ 12. RESPONSIVE ============ */
@media(max-width:960px){
  .badges{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .signals-grid{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  section{padding:60px 0}
  .nav{display:none;position:absolute;top:70px;left:0;right:0;background:var(--bg-900);flex-direction:column;padding:18px 24px 26px;gap:4px;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .nav a{display:block;padding:11px 4px;font-size:1.02rem}
  .nav-toggle{display:block}
  .header-cta{display:none}
  .cards{grid-template-columns:1fr}
  .badges{grid-template-columns:1fr}
  .detector-card{padding:24px 18px}
  .dropzone{padding:38px 16px}
  .footer-grid{grid-template-columns:1fr}
  .hero{padding:64px 0 44px}
}