/* ===== VARIABLES ===== */
:root{
  --bg:#10101a;--surface:#17171f;--elevated:#1e1e28;--border:#2a2a38;
  --text:#d2d4e0;--muted:#7c7e96;--subtle:#52546a;
  --accent:#6b9eff;--accent-h:#5a8ef0;--accent-glow:rgba(107,158,255,.1);
  --success:#4eca6a;--error:#e05555;
  --radius:8px;--radius-sm:5px;
  --mono:'SF Mono','Cascadia Code','Fira Code',Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Inter,Roboto,sans-serif;
  --transition:.15s ease;--max-w:920px
}
body.light{
  --bg:#f5f5f1;--surface:#ffffff;--elevated:#eeeee9;--border:#d5d5db;
  --text:#1c1c26;--muted:#5e5e78;--subtle:#9494a6;
  --accent:#3968d0;--accent-h:#2d58b8;--accent-glow:rgba(57,104,208,.06);
  --success:#2e8b3d;--error:#c03030
}

/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{font-family:var(--sans);font-size:15px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
button{cursor:pointer;font:inherit;border:none;background:none;color:inherit}
input,select,textarea{font:inherit}
h1{font-size:1.8rem;font-weight:700;line-height:1.2;letter-spacing:-.03em}
h2{font-size:1.25rem;font-weight:600;line-height:1.3;margin-bottom:.5em}
h3{font-size:1.05rem;font-weight:600}
p{margin-bottom:.7em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);border:0;white-space:nowrap}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* ===== HEADER ===== */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;height:52px;gap:20px}
.logo{display:flex;align-items:center;gap:8px;color:var(--text);font-weight:700;font-size:1.05rem;text-decoration:none;flex-shrink:0}
.logo:hover{text-decoration:none;color:var(--accent)}
.nav-toggle{display:none;flex-direction:column;gap:4px;padding:6px}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}
.site-nav{display:flex;align-items:center;gap:2px;flex:1}
.site-nav a{padding:6px 10px;color:var(--muted);font-size:.84rem;font-weight:500;border-radius:var(--radius-sm);transition:all var(--transition);text-decoration:none}
.site-nav a:hover{color:var(--text);background:var(--elevated);text-decoration:none}
.site-nav a.active{color:var(--accent);background:var(--accent-glow)}
.theme-toggle{width:34px;height:34px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);font-size:1.1rem;color:var(--muted);transition:all var(--transition);flex-shrink:0;margin-left:auto}
.theme-toggle:hover{color:var(--text);background:var(--elevated)}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:500;cursor:pointer;border:1px solid var(--border);background:var(--elevated);color:var(--text);transition:all var(--transition);text-decoration:none;white-space:nowrap}
.btn:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.btn--primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn--primary:hover{background:var(--accent-h);border-color:var(--accent-h);color:#fff}
.btn--sm{padding:5px 10px;font-size:.8rem}
.btn--icon{width:30px;height:30px;padding:0;display:inline-flex;align-items:center;justify-content:center;background:var(--elevated);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);font-size:.95rem;cursor:pointer;transition:all var(--transition)}
.btn--icon:hover{color:var(--text);border-color:var(--accent)}

/* ===== FORM ELEMENTS ===== */
.te-input{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:7px 10px;border-radius:var(--radius-sm);font-size:.85rem;outline:none;transition:border-color var(--transition);width:100%}
.te-input:focus{border-color:var(--accent)}
.te-input::placeholder{color:var(--subtle)}
.te-textarea{width:100%;min-height:200px;resize:vertical;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:16px;color:var(--text);font-family:var(--sans);font-size:.92rem;line-height:1.7;outline:none;transition:border-color var(--transition)}
.te-textarea:focus{border-color:var(--accent)}
.te-textarea::placeholder{color:var(--subtle)}
.te-textarea--output{background:var(--surface);cursor:default}
.te-select{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:7px 10px;border-radius:var(--radius-sm);font-size:.85rem;outline:none;cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%237c7e96' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:28px;transition:border-color var(--transition)}
.te-select:focus{border-color:var(--accent)}

/* ===== HOMEPAGE ===== */
.homepage{padding-top:24px;padding-bottom:48px}
.hero-intro{margin-bottom:20px}
.hero-intro h1{margin-bottom:6px}
.hero-intro p{color:var(--muted);font-size:.92rem;max-width:560px;margin:0}

/* ===== EDITOR FRAME ===== */
.editor-frame{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-bottom:8px}

/* ===== TOOLBAR ===== */
.editor-toolbar{background:var(--elevated);border-bottom:1px solid var(--border);padding:5px 8px;border-radius:var(--radius) var(--radius) 0 0;position:relative;z-index:10}
.toolbar-scroll{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.toolbar-group{display:flex;align-items:center;gap:1px}
.toolbar-btn{padding:6px 9px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:500;color:var(--muted);background:none;border:none;cursor:pointer;white-space:nowrap;transition:all var(--transition);line-height:1}
.toolbar-btn:hover{color:var(--text);background:rgba(255,255,255,.06)}
body.light .toolbar-btn:hover{background:rgba(0,0,0,.05)}
.toolbar-btn.active{color:var(--accent);background:var(--accent-glow)}
.toolbar-sep{width:1px;height:18px;background:var(--border);margin:0 4px;flex-shrink:0}

/* ===== TOOLBAR DROPDOWNS ===== */
.toolbar-drop{position:relative}
.toolbar-menu{display:none;position:absolute;top:calc(100% + 4px);left:0;background:var(--elevated);border:1px solid var(--border);border-radius:var(--radius);padding:4px;min-width:160px;box-shadow:0 8px 24px rgba(0,0,0,.35);z-index:200}
body.light .toolbar-menu{box-shadow:0 8px 24px rgba(0,0,0,.1)}
.toolbar-drop.open .toolbar-menu{display:block}
.toolbar-menu button{display:block;width:100%;text-align:left;padding:7px 12px;color:var(--muted);font-size:.82rem;border-radius:var(--radius-sm);transition:all var(--transition);background:none;border:none;cursor:pointer}
.toolbar-menu button:hover{color:var(--text);background:var(--accent-glow)}

/* ===== SEARCH PANEL ===== */
.search-panel{display:flex;flex-direction:column;gap:6px;padding:8px 12px;border-bottom:1px solid var(--border);background:var(--elevated)}
.search-panel.hidden{display:none}
.search-row{display:flex;align-items:center;gap:6px}
.search-row .te-input{max-width:240px;flex:1}
.search-count{font-size:.76rem;color:var(--muted);min-width:64px;text-align:center}

/* ===== MAIN EDITOR ===== */
.main-editor{width:100%;min-height:55vh;background:var(--surface);color:var(--text);border:none;border-radius:0;padding:20px 24px;font-family:var(--sans);font-size:16px;line-height:1.75;resize:vertical;outline:none;display:block}
.main-editor::placeholder{color:var(--subtle)}

/* ===== EDITOR STATS ===== */
.editor-stats{display:flex;flex-wrap:wrap;gap:4px 14px;padding:8px 16px;border-top:1px solid var(--border);font-size:.78rem;color:var(--muted)}
.editor-stats .stat strong{color:var(--text);font-weight:600}
.save-indicator{margin-left:auto;font-style:italic;color:var(--success)}

/* ===== INFO NOTE ===== */
.info-note{border:1px solid rgba(107,158,255,.18);border-radius:var(--radius);padding:14px 18px;font-size:.86rem;color:var(--muted);margin:20px 0;background:var(--accent-glow);line-height:1.6}
.info-note strong{color:var(--text);font-weight:600}

/* ===== TOOL PAGES ===== */
.tool-page{padding-top:28px;padding-bottom:48px}
.tool-hero{margin-bottom:20px}
.tool-hero h1{margin-bottom:6px}
.tool-hero p{color:var(--muted);font-size:.9rem;line-height:1.7;max-width:620px}
.tool-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}
.tool-panel label{display:block;font-size:.84rem;font-weight:500;color:var(--muted);margin-bottom:6px}
.output-label{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.tool-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tool-stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px;margin-top:16px}
.tool-stat{background:var(--elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;text-align:center}
.tool-stat .stat-value{font-size:1.35rem;font-weight:700;color:var(--text);display:block;margin-bottom:2px;font-variant-numeric:tabular-nums}
.tool-stat .stat-label{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}

/* ===== BREADCRUMB ===== */
.breadcrumb{font-size:.78rem;color:var(--muted);margin-bottom:16px;padding-top:4px}
.breadcrumb a{color:var(--subtle);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 5px}

/* ===== CONTENT SECTIONS ===== */
.content-section{margin-top:28px;padding-top:24px;border-top:1px solid var(--border)}
.content-section h2{margin-bottom:10px}
.content-section p{color:var(--muted);line-height:1.7;font-size:.9rem}
.content-section ul,.content-section ol{list-style-position:outside;padding-left:20px;margin-bottom:12px}
.content-section li{color:var(--muted);line-height:1.7;font-size:.9rem;margin-bottom:4px}
.content-section code{background:var(--elevated);padding:2px 5px;border-radius:3px;font-size:.84em;font-family:var(--mono)}

/* ===== FAQ ===== */
.faq-section{margin-top:24px}
.faq-section h2{margin-bottom:12px}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:5px;overflow:hidden;background:var(--surface)}
.faq-item summary{padding:12px 16px;cursor:pointer;font-weight:500;font-size:.88rem;list-style:none;display:flex;align-items:center;justify-content:space-between;transition:color var(--transition)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:1.05rem;color:var(--subtle);font-weight:300;flex-shrink:0;margin-left:12px}
.faq-item:hover summary{color:var(--accent)}
.faq-item[open] summary::after{content:'\2212';color:var(--accent)}
.faq-item[open] summary{border-bottom:1px solid var(--border)}
.faq-item p{padding:12px 16px;font-size:.86rem;color:var(--muted);line-height:1.7;margin:0}

/* ===== RELATED TOOLS ===== */
.related-section{margin-top:24px}
.related-section h2{margin-bottom:10px}
.related-grid{display:flex;flex-wrap:wrap;gap:8px}
.related-link{display:inline-flex;align-items:center;padding:7px 14px;background:var(--elevated);border:1px solid var(--border);border-radius:18px;font-size:.82rem;color:var(--text);text-decoration:none;transition:all var(--transition)}
.related-link:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

/* ===== FOOTER ===== */
.site-footer{border-top:1px solid var(--border);padding-top:36px;padding-bottom:20px;margin-top:40px;background:var(--surface)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:20px}
.footer-col{display:flex;flex-direction:column;gap:5px}
.footer-col strong{font-size:.72rem;color:var(--subtle);text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px}
.footer-col a{font-size:.82rem;color:var(--muted);text-decoration:none;transition:color var(--transition)}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{margin-top:24px;padding-top:16px;border-top:1px solid var(--border);text-align:center}
.footer-bottom p{font-size:.76rem;color:var(--subtle);margin:0}

/* ===== LEGAL PAGES ===== */
.legal-page{padding-top:28px;padding-bottom:48px}
.legal-page h1{margin-bottom:16px}
.legal-page h2{margin-top:24px;margin-bottom:6px;font-size:1.1rem}
.legal-page p,.legal-page li{font-size:.9rem;color:var(--muted);line-height:1.7}
.legal-page ul{list-style:disc;padding-left:20px;margin-bottom:10px}
.legal-page li{margin-bottom:4px}
.legal-page a{color:var(--accent)}

/* ===== MARKDOWN LAYOUT ===== */
.md-layout{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.md-pane{display:flex;flex-direction:column;min-height:0}
.md-pane-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.md-pane-header h3{font-size:.88rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.md-textarea{flex:1;min-height:400px;font-family:var(--mono);font-size:.88rem;line-height:1.6;resize:none}
.md-preview-content{flex:1;padding:18px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow-y:auto;min-height:400px;color:var(--text);line-height:1.7;font-size:.92rem}
.md-preview-content h1{font-size:1.5rem;font-weight:700;margin:0 0 12px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.md-preview-content h2{font-size:1.2rem;font-weight:600;margin:18px 0 8px;padding-bottom:6px;border-bottom:1px solid var(--border)}
.md-preview-content h3{font-size:1.05rem;font-weight:600;margin:14px 0 6px}
.md-preview-content h4,.md-preview-content h5,.md-preview-content h6{font-size:.95rem;font-weight:600;margin:12px 0 4px}
.md-preview-content p{margin:0 0 10px}
.md-preview-content code{background:var(--elevated);padding:2px 5px;border-radius:3px;font-family:var(--mono);font-size:.84em}
.md-preview-content pre{background:var(--elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;margin:0 0 10px;overflow-x:auto}
.md-preview-content pre code{background:none;padding:0;font-size:.84rem;line-height:1.5}
.md-preview-content blockquote{border-left:3px solid var(--accent);padding:8px 14px;margin:0 0 10px;color:var(--muted);background:var(--accent-glow);border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.md-preview-content ul,.md-preview-content ol{padding-left:20px;margin:0 0 10px}
.md-preview-content li{margin-bottom:3px}
.md-preview-content a{color:var(--accent)}
.md-preview-content img{max-width:100%;border-radius:var(--radius-sm);margin:6px 0}
.md-preview-content hr{border:none;border-top:1px solid var(--border);margin:14px 0}

/* ===== FOCUS MODE ===== */
body.focus-mode .site-header,
body.focus-mode .hero-intro,
body.focus-mode .info-section,
body.focus-mode .content-section,
body.focus-mode .faq-section,
body.focus-mode .related-section,
body.focus-mode .site-footer{display:none}
body.focus-mode .main-editor{min-height:calc(100vh - 100px)}

/* ===== RESPONSIVE: TABLET ===== */
@media(max-width:768px){
  .container{padding:0 20px}
  .nav-toggle{display:flex}
  .site-nav{display:none;position:absolute;top:52px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:8px 16px;flex-direction:column;gap:2px;z-index:90}
  .site-nav.open{display:flex}
  .site-nav a{padding:10px 12px;min-height:42px;display:flex;align-items:center}
  .theme-toggle{margin-left:auto}
  h1{font-size:1.45rem}
  .main-editor{min-height:40vh;padding:16px}
  .tool-panel{padding:18px}
  .md-layout{grid-template-columns:1fr}
  .md-textarea{min-height:250px}
  .md-preview-content{min-height:250px}
  .tool-stats{grid-template-columns:repeat(3,1fr)}
}

/* ===== RESPONSIVE: PHONE ===== */
@media(max-width:480px){
  .container{padding:0 16px}
  body{font-size:14px}
  h1{font-size:1.25rem}
  h2{font-size:1.1rem}
  .header-inner{height:46px;gap:10px}
  .homepage{padding-top:16px}
  .tool-page{padding-top:18px;padding-bottom:32px}
  .tool-panel{padding:14px}
  .main-editor{min-height:35vh;padding:14px;font-size:15px}
  .tool-actions{gap:6px}
  .tool-actions .btn{flex:1 1 auto;min-width:0;justify-content:center}
  .tool-stats{grid-template-columns:repeat(2,1fr);gap:8px}
  .tool-stat{padding:10px}
  .tool-stat .stat-value{font-size:1.15rem}
  .editor-stats{gap:3px 10px;padding:7px 12px;font-size:.74rem}
  .search-row .te-input{max-width:none}
  .search-row{flex-wrap:wrap}
  .footer-grid{grid-template-columns:1fr 1fr}
  .related-link{padding:6px 12px;font-size:.8rem}
}