/* ===== T4UHubIMG Design System ===== */
:root{
  --primary:#3F51B5; --primary-dark:#283593; --accent:#5C6BC0; --light:#E8EAF6;
  --bg:#F8FAFC; --card:#FFFFFF; --success:#10B981; --warning:#F59E0B; --danger:#EF4444;
  --text:#111827; --text-2:#6B7280; --border:#E5E7EB;
  --radius:18px; --radius-sm:12px; --radius-lg:26px;
  --shadow:0 8px 30px rgba(40,53,147,.08); --shadow-lg:0 18px 50px rgba(40,53,147,.16);
  --grad:linear-gradient(135deg,#5C6BC0,#3F51B5 55%,#283593);
  --grad-soft:linear-gradient(135deg,#E8EAF6,#FFFFFF);
  --glass:rgba(255,255,255,.65); --glass-border:rgba(255,255,255,.5);
  --nav-h:64px; --header-h:64px;
  --ff:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --trans:.25s cubic-bezier(.4,0,.2,1);
}
[data-theme="dark"]{
  --bg:#0B1020; --card:#141a2e; --light:#1b2440; --text:#E7EAF3; --text-2:#9aa3bd;
  --border:#26304d; --glass:rgba(20,26,46,.6); --glass-border:rgba(255,255,255,.08);
  --grad-soft:linear-gradient(135deg,#1b2440,#141a2e);
  --shadow:0 8px 30px rgba(0,0,0,.4); --shadow-lg:0 18px 50px rgba(0,0,0,.55);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--ff);background:var(--bg);color:var(--text);line-height:1.6;
  transition:background var(--trans),color var(--trans);overflow-x:hidden;padding-bottom:0}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;
  font-weight:600;font-size:15px;padding:12px 22px;border-radius:var(--radius-sm);
  background:var(--light);color:var(--text);transition:var(--trans);font-family:inherit}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(63,81,181,.35)}
.btn-success{background:var(--success);color:#fff}
.btn-ghost{background:transparent;border:1px solid var(--border)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px;
  background:var(--light);color:var(--primary);letter-spacing:.3px}
.badge.hot{background:#FEE2E2;color:#EF4444}.badge.new{background:#D1FAE5;color:#059669}
[data-theme="dark"] .badge.hot{background:#3b1a1a}[data-theme="dark"] .badge.new{background:#10331f}

/* Header */
.site-header{position:sticky;top:0;z-index:100;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  background:var(--glass);border-bottom:1px solid var(--glass-border);height:var(--header-h)}
.header-inner{display:flex;align-items:center;gap:18px;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--text);white-space:nowrap}
.logo .mark{width:34px;height:34px;border-radius:10px;background:var(--grad);display:grid;place-items:center;
  color:#fff;font-size:16px;font-weight:800;box-shadow:0 6px 16px rgba(63,81,181,.4)}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav{display:flex;align-items:center;gap:4px;margin-left:6px}
.nav .nav-item{position:relative}
.nav .nav-link{padding:9px 13px;border-radius:10px;color:var(--text-2);font-weight:600;font-size:14px;
  display:inline-block;transition:var(--trans);cursor:pointer}
.nav .nav-link:hover{background:var(--light);color:var(--primary)}
.dropdown{position:absolute;top:calc(100% + 8px);left:0;min-width:230px;background:var(--card);
  border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:8px;
  opacity:0;visibility:hidden;transform:translateY(8px);transition:var(--trans);z-index:120}
.nav-item:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:9px 12px;border-radius:10px;color:var(--text);font-size:14px;font-weight:500}
.dropdown a:hover{background:var(--light);color:var(--primary)}
.header-search{flex:1;max-width:420px;position:relative;margin-left:auto}
.header-search input{width:100%;padding:10px 14px 10px 40px;border:1px solid var(--border);border-radius:999px;
  background:var(--card);color:var(--text);font-size:14px;font-family:inherit;outline:none;transition:var(--trans)}
.header-search input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(63,81,181,.12)}
.header-search .si{position:absolute;left:14px;top:50%;transform:translateY(-50%);opacity:.5}
.header-actions{display:flex;align-items:center;gap:8px}
.icon-btn{width:42px;height:42px;border-radius:12px;border:1px solid var(--border);background:var(--card);
  display:grid;place-items:center;cursor:pointer;color:var(--text);transition:var(--trans);font-size:18px}
.icon-btn:hover{background:var(--light);color:var(--primary)}
.hamburger{display:none}
.search-results{position:absolute;top:calc(100% + 8px);left:0;right:0;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);max-height:60vh;overflow:auto;padding:6px;display:none;z-index:130}
.search-results.show{display:block}
.search-results a{display:flex;justify-content:space-between;padding:10px 12px;border-radius:10px;color:var(--text);font-size:14px}
.search-results a:hover{background:var(--light)}
.search-results .cat{font-size:11px;color:var(--text-2)}

/* Hero */
.hero{padding:54px 0 36px;text-align:center;position:relative}
.hero h1{font-size:clamp(30px,5vw,52px);font-weight:800;line-height:1.1;letter-spacing:-1px;margin-bottom:14px}
.hero h1 .g{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:clamp(15px,2vw,19px);color:var(--text-2);max-width:680px;margin:0 auto 26px}
.hero-search{max-width:620px;margin:0 auto;position:relative}
.hero-search input{width:100%;padding:18px 20px 18px 54px;border-radius:var(--radius-lg);border:1px solid var(--border);
  background:var(--card);box-shadow:var(--shadow);font-size:16px;color:var(--text);font-family:inherit;outline:none}
.hero-search input:focus{border-color:var(--primary);box-shadow:0 0 0 5px rgba(63,81,181,.13)}
.hero-search .si{position:absolute;left:20px;top:50%;transform:translateY(-50%);font-size:20px;opacity:.5}
.hero-stats{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.hero-stats .s b{display:block;font-size:26px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-stats .s span{font-size:13px;color:var(--text-2)}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;z-index:-1}
.blob.b1{width:340px;height:340px;background:#A5B4FC;top:-80px;left:-60px}
.blob.b2{width:300px;height:300px;background:#C7D2FE;top:0;right:-60px}

/* Sections */
.section{padding:34px 0}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.section-head h2{font-size:clamp(20px,3vw,28px);font-weight:800;letter-spacing:-.5px}
.section-head .sub{color:var(--text-2);font-size:14px;margin-top:2px}
.section-head a.more{font-weight:600;font-size:14px}

/* Grids + cards */
.grid{display:grid;gap:16px}
.grid.tools{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.grid.cats{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;
  transition:var(--trans);position:relative;overflow:hidden}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:transparent}
.tool-card{display:flex;flex-direction:column;gap:10px;cursor:pointer}
.tool-card .ic{width:46px;height:46px;border-radius:13px;background:var(--grad-soft);display:grid;place-items:center;
  font-size:22px;border:1px solid var(--border)}
.tool-card h3{font-size:15px;font-weight:700}
.tool-card p{font-size:12.5px;color:var(--text-2);line-height:1.45;flex:1}
.tool-card .foot{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--text-2)}
.cat-card{display:flex;gap:14px;align-items:center;cursor:pointer}
.cat-card .ic{width:54px;height:54px;border-radius:15px;background:var(--grad);color:#fff;display:grid;place-items:center;font-size:24px;flex-shrink:0;box-shadow:0 8px 20px rgba(63,81,181,.3)}
.cat-card h3{font-size:16px;font-weight:700}
.cat-card span{font-size:12.5px;color:var(--text-2)}

/* Tool page */
.breadcrumb{font-size:13px;color:var(--text-2);padding:16px 0 4px;display:flex;gap:8px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-2)}.breadcrumb a:hover{color:var(--primary)}
.tool-hero{text-align:center;padding:18px 0 8px}
.tool-hero .ic{width:64px;height:64px;border-radius:18px;background:var(--grad);color:#fff;display:grid;place-items:center;font-size:30px;margin:0 auto 14px;box-shadow:var(--shadow-lg)}
.tool-hero h1{font-size:clamp(24px,4vw,36px);font-weight:800;letter-spacing:-.5px}
.tool-hero p{color:var(--text-2);max-width:620px;margin:8px auto 0}
.workspace{display:grid;grid-template-columns:1fr 320px;gap:18px;margin:22px 0}
@media(max-width:880px){.workspace{grid-template-columns:1fr}}
.dropzone{border:2px dashed var(--border);border-radius:var(--radius-lg);background:var(--card);
  padding:40px 20px;text-align:center;cursor:pointer;transition:var(--trans)}
.dropzone.drag{border-color:var(--primary);background:var(--light)}
.dropzone .dz-ic{font-size:44px;margin-bottom:10px}
.dropzone h3{font-size:18px;font-weight:700;margin-bottom:6px}
.dropzone p{color:var(--text-2);font-size:14px}
.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px}
.panel h3{font-size:15px;font-weight:700;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--text-2)}
.field input,.field select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;
  background:var(--bg);color:var(--text);font-family:inherit;font-size:14px;outline:none}
.field input:focus,.field select:focus{border-color:var(--primary)}
.field .row{display:flex;gap:10px}
.range-val{float:right;color:var(--primary);font-weight:700}
input[type=range]{accent-color:var(--primary);width:100%}
input[type=color]{height:40px;padding:2px}
.preview-wrap{background:repeating-conic-gradient(#e9edf5 0 25%,#fff 0 50%) 50%/22px 22px;border-radius:var(--radius);
  border:1px solid var(--border);min-height:240px;display:grid;place-items:center;overflow:hidden;padding:12px}
[data-theme="dark"] .preview-wrap{background:repeating-conic-gradient(#1a2138 0 25%,#222b45 0 50%) 50%/22px 22px}
.preview-wrap img,.preview-wrap canvas{max-height:460px;border-radius:8px;box-shadow:var(--shadow)}
.meta-line{display:flex;justify-content:space-between;font-size:13px;padding:7px 0;border-bottom:1px solid var(--border)}
.meta-line span:first-child{color:var(--text-2)}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.progress{height:8px;border-radius:999px;background:var(--light);overflow:hidden;margin:12px 0;display:none}
.progress.show{display:block}
.progress .bar{height:100%;width:0;background:var(--grad);transition:width .3s}
.thumbs{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.thumbs .t{width:64px;height:64px;border-radius:10px;object-fit:cover;border:1px solid var(--border);position:relative}

/* Content blocks */
.content{max-width:820px;margin:0 auto}
.content h2{font-size:24px;font-weight:800;margin:30px 0 12px;letter-spacing:-.5px}
.content h3{font-size:18px;font-weight:700;margin:20px 0 8px}
.content p{margin-bottom:14px;color:var(--text)}
.content ul,.content ol{margin:0 0 16px 22px}.content li{margin-bottom:7px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden;background:var(--card)}
.faq-q{padding:16px 18px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-a{padding:0 18px;max-height:0;overflow:hidden;transition:max-height .3s;color:var(--text-2)}
.faq-item.open .faq-a{max-height:400px;padding:0 18px 16px}
.faq-item.open .faq-q .chev{transform:rotate(180deg)}
.chev{transition:transform .3s}

/* Skeleton */
.skel{background:linear-gradient(90deg,var(--light) 25%,var(--border) 37%,var(--light) 63%);
  background-size:400% 100%;animation:shimmer 1.4s infinite;border-radius:10px}
@keyframes shimmer{0%{background-position:100% 0}100%{background-position:-100% 0}}

/* Newsletter */
.newsletter{background:var(--grad);border-radius:var(--radius-lg);padding:38px;text-align:center;color:#fff;box-shadow:var(--shadow-lg)}
.newsletter h2{color:#fff;font-size:26px;font-weight:800}
.newsletter p{opacity:.9;margin:8px 0 20px}
.newsletter form{display:flex;gap:10px;max-width:460px;margin:0 auto;flex-wrap:wrap}
.newsletter input{flex:1;min-width:200px;padding:14px 18px;border-radius:999px;border:0;font-family:inherit;font-size:15px}
.newsletter .btn{background:#fff;color:var(--primary)}

/* Footer */
.site-footer{background:var(--card);border-top:1px solid var(--border);padding:46px 0 20px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:30px}
.footer-grid h4{font-size:14px;font-weight:700;margin-bottom:14px}
.footer-grid a{display:block;color:var(--text-2);font-size:13.5px;padding:4px 0}
.footer-grid a:hover{color:var(--primary)}
.footer-brand p{color:var(--text-2);font-size:13.5px;margin:12px 0;max-width:280px}
.social{display:flex;gap:10px}
.social a{width:38px;height:38px;border-radius:10px;background:var(--light);display:grid;place-items:center;font-size:16px}
.footer-bottom{border-top:1px solid var(--border);margin-top:30px;padding-top:18px;text-align:center;color:var(--text-2);font-size:13px}

/* Mobile bottom nav + FAB */
.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:var(--nav-h);z-index:200;
  background:var(--glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--glass-border);
  justify-content:space-around;align-items:center}
.bottom-nav a{display:flex;flex-direction:column;align-items:center;gap:3px;color:var(--text-2);font-size:10.5px;font-weight:600;flex:1;padding:6px 0}
.bottom-nav a.active{color:var(--primary)}
.bottom-nav a .bi{font-size:21px}
.fab{display:none;position:fixed;right:18px;bottom:calc(var(--nav-h) + 16px);z-index:201;width:58px;height:58px;border-radius:50%;
  background:var(--grad);color:#fff;border:0;font-size:26px;box-shadow:0 12px 30px rgba(63,81,181,.5);cursor:pointer}
.mobile-menu{position:fixed;inset:0;z-index:300;background:var(--bg);transform:translateX(100%);transition:transform .3s;
  overflow:auto;padding:20px}
.mobile-menu.open{transform:translateX(0)}
.mobile-menu .mm-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.mobile-menu a{display:block;padding:14px;border-radius:12px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border)}
.toast{position:fixed;bottom:90px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--text);color:var(--bg);
  padding:12px 22px;border-radius:999px;font-size:14px;font-weight:600;opacity:0;transition:var(--trans);z-index:400;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(max-width:980px){.nav{display:none}.header-search{display:none}.hamburger{display:grid}
  .bottom-nav{display:flex}.fab{display:grid}body{padding-bottom:var(--nav-h)}
  .footer-grid{grid-template-columns:1fr 1fr}.site-footer{margin-bottom:var(--nav-h)}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}.hero-stats{gap:20px}}
.fade-up{opacity:0;transform:translateY(16px);animation:fadeUp .5s forwards}
@keyframes fadeUp{to{opacity:1;transform:none}}
.install-banner{position:fixed;left:14px;right:14px;bottom:14px;z-index:250;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:14px 16px;display:none;align-items:center;gap:12px}
.install-banner.show{display:flex}