/* ===== RESET & VARIABLES ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:         #0f172a;
  --bg-card:    #1e293b;
  --bg-input:   #0f172a;
  --border:     #334155;
  --text:       #f1f5f9;
  --text-dim:   #94a3b8;
  --primary:    #2563eb;
  --primary-hover:#1d4ed8;
  --green:      #22c55e;
  --red:        #ef4444;
  --orange:     #f59e0b;
  --purple:     #a855f7;
  --radius:     8px;
  --sidebar-w:  240px;
  --topbar-h:   56px;
  --font:       system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --mono:       'Cascadia Code','Fira Code','JetBrains Mono','SF Mono',Consolas,monospace;
}
[data-theme="light"]{
  --bg:         #f8fafc;
  --bg-card:    #ffffff;
  --bg-input:   #f1f5f9;
  --border:     #e2e8f0;
  --text:       #0f172a;
  --text-dim:   #64748b;
  --green:      #15803d;
  --red:        #dc2626;
  --orange:     #d97706;
  --purple:     #7c3aed;
}
html{font-size:15px;scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;min-height:100vh}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
code{font-family:var(--mono);background:var(--bg-input);padding:2px 6px;border-radius:4px;font-size:.9em}

/* ===== SIDEBAR ===== */
.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-w);height:100vh;background:var(--bg-card);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:100;transition:transform .25s ease}
.sidebar-header{padding:20px 16px 12px;border-bottom:1px solid var(--border)}
.logo-link{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.logo-text{font-size:1.15rem;font-weight:700}
.sidebar-nav{flex:1;overflow-y:auto;padding:8px 0}
.nav-group{padding:4px 0}
.nav-group-title{display:block;padding:12px 16px 4px;font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim)}
.nav-link{display:flex;align-items:center;gap:10px;padding:8px 16px;color:var(--text-dim);font-size:.88rem;transition:all .15s;text-decoration:none;border-left:3px solid transparent}
.nav-link:hover{color:var(--text);background:rgba(255,255,255,.04);text-decoration:none}
.nav-link.active{color:var(--primary);border-left-color:var(--primary);background:rgba(37,99,235,.08)}
.nav-link svg{flex-shrink:0}
.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border)}

/* ===== TOPBAR (mobile) ===== */
.topbar{display:none;position:fixed;top:0;left:0;right:0;height:var(--topbar-h);background:var(--bg-card);border-bottom:1px solid var(--border);align-items:center;padding:0 12px;gap:12px;z-index:90}
.topbar-title{font-weight:700;font-size:1.05rem}
.menu-toggle,.theme-toggle{background:none;border:none;color:var(--text);cursor:pointer;padding:6px;border-radius:6px;display:flex;align-items:center;justify-content:center}
.menu-toggle:hover,.theme-toggle:hover{background:rgba(255,255,255,.08)}
.mobile-theme{margin-left:auto}
.overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:95}
.overlay.open{display:block}

/* Theme toggle icons */
[data-theme="light"] .icon-sun{display:none}
[data-theme="light"] .icon-moon{display:block}
:root .icon-sun{display:block}
:root .icon-moon{display:none}
[data-theme="light"] .menu-toggle:hover,[data-theme="light"] .theme-toggle:hover{background:rgba(0,0,0,.06)}
[data-theme="light"] .nav-link:hover{background:rgba(0,0,0,.04)}

/* ===== MAIN CONTENT ===== */
.main-content{margin-left:var(--sidebar-w);min-height:100vh;padding:32px 40px 60px}
.tool-section{display:none;max-width:960px;margin:0 auto}
.tool-section.active{display:block;animation:fadeIn .2s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ===== HERO ===== */
.hero{text-align:center;padding:48px 0 32px}
.hero h1{font-size:2.1rem;font-weight:800;line-height:1.2;margin-bottom:12px}
.hero-sub{font-size:1.08rem;color:var(--text-dim);max-width:600px;margin:0 auto}

/* ===== TOOL GRID ===== */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:40px}
.tool-card{display:block;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:all .2s;text-decoration:none;color:var(--text)}
.tool-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 4px 24px rgba(0,0,0,.15);text-decoration:none}
.tool-card h2{font-size:1rem;font-weight:600;margin:12px 0 6px}
.tool-card p{font-size:.85rem;color:var(--text-dim);line-height:1.5}
.card-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center}
.ci-blue{background:rgba(37,99,235,.12);color:#2563eb}
.ci-green{background:rgba(34,197,94,.12);color:var(--green)}
.ci-orange{background:rgba(245,158,11,.12);color:var(--orange)}
.ci-purple{background:rgba(168,85,247,.12);color:var(--purple)}

/* ===== TOOL HEADERS ===== */
.tool-header{margin-bottom:24px}
.tool-header h1{font-size:1.6rem;font-weight:700;margin-bottom:6px}
.tool-header p{color:var(--text-dim);font-size:.95rem}

/* ===== DROP ZONE ===== */
.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:40px 20px;text-align:center;cursor:pointer;transition:all .2s;color:var(--text-dim)}
.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary);background:rgba(37,99,235,.06)}
.drop-zone svg{margin:0 auto 12px;color:var(--text-dim)}
.drop-zone p{font-size:.95rem}
.file-label{color:var(--primary);cursor:pointer;font-weight:600}
.file-label:hover{text-decoration:underline}
.drop-hint{display:block;margin-top:6px;font-size:.78rem;color:var(--text-dim)}

/* ===== CONTROLS ===== */
.controls{padding:16px 0}
.control-row{display:flex;align-items:center;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.control-row.inline{flex-wrap:wrap}
.control-row.wrap{flex-wrap:wrap}
.control-row label{font-size:.88rem;white-space:nowrap}
input[type="range"]{flex:1;min-width:120px;accent-color:var(--primary)}
input[type="number"],input[type="text"],select{background:var(--bg-input);border:1px solid var(--border);border-radius:6px;padding:8px 12px;color:var(--text);font-size:.88rem;font-family:var(--font)}
input[type="number"]{width:90px}
select{cursor:pointer}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.3)}
.btn:focus-visible,.nav-link:focus-visible,.tool-card:focus-visible,.file-label:focus-visible,.link-btn:focus-visible,summary:focus-visible,.menu-toggle:focus-visible,.theme-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px;box-shadow:0 0 0 4px rgba(37,99,235,.2)}
.input-group{display:flex;flex-direction:column;gap:4px}
.input-group label{font-size:.82rem;color:var(--text-dim);font-weight:500}
.triple{display:flex;gap:6px}
.triple input{width:70px}
.dim-info{font-size:.85rem;color:var(--text-dim);margin-bottom:8px}
.check-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:8px 0}
.check-label{display:flex;align-items:center;gap:8px;font-size:.88rem;cursor:pointer}
.check-label input{accent-color:var(--primary)}
.link-btn{background:none;border:1px solid var(--border);border-radius:6px;padding:6px;cursor:pointer;color:var(--text-dim);display:flex;align-items:center}
.link-btn.active{color:var(--primary);border-color:var(--primary)}
.link-btn:hover{background:rgba(128,128,128,.08)}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border:none;border-radius:6px;font-size:.88rem;font-weight:600;cursor:pointer;transition:all .15s;font-family:var(--font);white-space:nowrap}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover)}
.btn-secondary{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{border-color:var(--text-dim);background:rgba(128,128,128,.08)}
.btn-sm{padding:5px 10px;font-size:.8rem}
.btn.full-width{width:100%;justify-content:center}
.copy-btn.copied{background:var(--green);color:#fff;border-color:var(--green)}

/* ===== TEXTAREAS ===== */
.textarea,.code-textarea{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);padding:14px;color:var(--text);font-size:.9rem;resize:vertical;line-height:1.6}
.code-textarea{font-family:var(--mono);font-size:.85rem;tab-size:2}
.textarea:focus,.code-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}

/* ===== SPLIT PANES ===== */
.split-panes{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.split-panes.equal .pane{min-height:400px}
.pane{display:flex;flex-direction:column;gap:4px}
.pane label{font-size:.82rem;font-weight:500;color:var(--text-dim)}
.pane textarea{flex:1}

/* ===== IMAGE PREVIEW ===== */
.comparison{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:16px 0}
.compare-item{text-align:center}
.compare-item h3{font-size:.85rem;font-weight:600;margin-bottom:8px;color:var(--text-dim)}
.compare-item img{max-height:300px;margin:0 auto;border-radius:6px;border:1px solid var(--border)}
.compare-item p{font-size:.85rem;color:var(--text-dim);margin-top:6px}
.preview-area{text-align:center;margin:16px 0}
.preview-area img{max-height:350px;margin:0 auto;border-radius:6px;border:1px solid var(--border)}
.preview-area p{margin-top:8px;font-size:.85rem;color:var(--text-dim)}
.actions{display:flex;align-items:center;gap:12px;margin-top:16px}
.savings-badge{display:inline-block;background:rgba(34,197,94,.12);color:var(--green);padding:4px 12px;border-radius:20px;font-size:.85rem;font-weight:600}

/* ===== PASSWORD ===== */
.password-display{display:flex;align-items:center;gap:12px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:16px}
.password-output{flex:1;font-family:var(--mono);font-size:1.1rem;word-break:break-all;overflow-wrap:anywhere}
.strength-meter{height:6px;background:var(--bg-input);border-radius:3px;margin-bottom:16px;position:relative;overflow:hidden}
.strength-bar{height:100%;border-radius:3px;transition:width .3s,background .3s}
#pg-label{position:absolute;right:0;top:-20px;font-size:.75rem;font-weight:600}

/* ===== COLOR ===== */
.color-layout{display:flex;gap:24px;align-items:flex-start}
.color-preview-box{width:120px;height:120px;border-radius:var(--radius);border:1px solid var(--border);flex-shrink:0}
.color-inputs{flex:1;display:flex;flex-direction:column;gap:12px}

/* ===== STATS ===== */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-bottom:16px}
.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;text-align:center}
.stat-num{display:block;font-size:1.5rem;font-weight:700;color:var(--primary)}
.stat-label{font-size:.78rem;color:var(--text-dim);margin-top:2px}

/* ===== HASH ===== */
.hash-results{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.hash-row{display:flex;align-items:center;gap:10px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;padding:10px 14px}
.hash-row strong{min-width:70px;font-size:.82rem;color:var(--text-dim)}
.hash-row code{flex:1;word-break:break-all;background:none;padding:0;font-size:.8rem}

/* ===== MARKDOWN ===== */
.md-preview{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;min-height:400px;overflow-y:auto;line-height:1.7}
.md-preview h1,.md-preview h2,.md-preview h3,.md-preview h4,.md-preview h5,.md-preview h6{margin:16px 0 8px;font-weight:700;line-height:1.3}
.md-preview h1{font-size:1.6rem;border-bottom:1px solid var(--border);padding-bottom:8px}
.md-preview h2{font-size:1.3rem;border-bottom:1px solid var(--border);padding-bottom:6px}
.md-preview h3{font-size:1.1rem}
.md-preview p{margin:8px 0}
.md-preview ul,.md-preview ol{margin:8px 0;padding-left:24px}
.md-preview li{margin:4px 0}
.md-preview pre{background:var(--bg-input);border:1px solid var(--border);border-radius:6px;padding:12px;overflow-x:auto;margin:12px 0}
.md-preview pre code{background:none;padding:0}
.md-preview code{background:var(--bg-input);padding:2px 6px;border-radius:4px;font-size:.9em}
.md-preview blockquote{border-left:3px solid var(--primary);padding:8px 16px;margin:12px 0;color:var(--text-dim);background:rgba(37,99,235,.04);border-radius:0 6px 6px 0}
.md-preview hr{border:none;border-top:1px solid var(--border);margin:16px 0}
.md-preview a{color:var(--primary)}
.md-preview img{max-width:100%;border-radius:6px}
.md-preview table{border-collapse:collapse;width:100%;margin:12px 0}
.md-preview th,.md-preview td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.md-preview th{background:var(--bg-input);font-weight:600}

/* ===== ERROR / SUCCESS ===== */
.error-box{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:var(--red);padding:10px 14px;border-radius:6px;font-size:.88rem;margin-bottom:12px}
.success-box{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:var(--green);padding:10px 14px;border-radius:6px;font-size:.88rem;margin-bottom:12px}

/* ===== FAQ ===== */
.faq{margin:40px 0 20px}
.faq h2{font-size:1.3rem;margin-bottom:16px}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px}
.faq-item summary{padding:14px 18px;font-weight:600;cursor:pointer;font-size:.95rem;list-style:none;display:flex;align-items:center;justify-content:space-between}
.faq-item summary::after{content:'+';font-size:1.2rem;color:var(--text-dim);transition:transform .2s}
.faq-item[open] summary::after{content:'-'}
.faq-item p{padding:0 18px 14px;color:var(--text-dim);font-size:.9rem}

/* ===== FOOTER ===== */
.site-footer{text-align:center;padding:32px 0 20px;border-top:1px solid var(--border);margin-top:40px;color:var(--text-dim);font-size:.85rem}
.footer-links{margin-top:6px}
.footer-links a{color:var(--text-dim);margin:0 8px}
.footer-links a:hover{color:var(--primary)}

/* ===== AD SLOTS ===== */
.ad-slot{min-height:0;margin:16px 0}

/* ===== HIDDEN ===== */
.hidden{display:none!important}

/* ===== RESPONSIVE ===== */
@media(max-width:768px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0)}
  .topbar{display:flex}
  .main-content{margin-left:0;padding:calc(var(--topbar-h) + 16px) 16px 40px}
  .hero h1{font-size:1.5rem}
  .hero-sub{font-size:.95rem}
  .tool-grid{grid-template-columns:1fr}
  .split-panes{grid-template-columns:1fr}
  .comparison{grid-template-columns:1fr}
  .color-layout{flex-direction:column}
  .color-preview-box{width:100%;height:60px}
  .check-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(3,1fr)}
  .control-row.inline{flex-direction:column;align-items:stretch}
  .control-row.inline .btn{width:100%;justify-content:center}
  .password-display{flex-direction:column;text-align:center}
}
@media(max-width:480px){
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .tool-header h2{font-size:1.3rem}
}
@media(min-width:769px){
  .topbar{display:none!important}
  .sidebar-footer .theme-toggle{width:100%;justify-content:flex-start;gap:8px;padding:8px 12px}
}
/* ===== PRINT ===== */
@media print{
  .sidebar,.topbar,.overlay,.drop-zone,.btn,.ad-slot,.controls,.menu-toggle,.theme-toggle,.nav-link{display:none!important}
  .main-content{margin-left:0;padding:0}
  body{background:#fff;color:#000}
  .tool-section{display:block!important;max-width:100%}
  .tool-section:not(.active){display:none!important}
  .code-textarea,.textarea{border:1px solid #ccc;background:#fff;color:#000}
  .md-preview{border:1px solid #ccc;background:#fff;color:#000}
}