*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f1117;--surface:#171b26;--surface2:#1e2333;--border:#272d3f;
  --accent:#3b82f6;--green:#10b981;--yellow:#f59e0b;--red:#ef4444;
  --text:#e2e8f0;--muted:#94a3b8;--radius:10px;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,sans-serif;line-height:1.6}
.skip-link{position:absolute;top:-100px;left:0;background:var(--accent);color:#fff;padding:.5rem 1rem;z-index:9999;transition:top .2s}
.skip-link:focus{top:0}
.container{max-width:960px;margin:0 auto;padding:0 1.25rem}

/* HEADER */
header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.9rem 1.25rem;flex-wrap:wrap;gap:.5rem}
.logo{font-weight:800;font-size:1.15rem;letter-spacing:-.5px}
nav a{color:var(--muted);text-decoration:none;font-size:.88rem;margin-left:1.1rem;transition:color .2s}
nav a:hover{color:var(--accent)}

/* HERO */
.hero{background:linear-gradient(135deg,#1a1f35,#0f1117);padding:2.5rem 0 2rem;text-align:center;border-bottom:1px solid var(--border)}
.hero h1{font-size:clamp(1.7rem,4vw,2.6rem);font-weight:800;margin-bottom:.5rem}
.hero-sub{color:var(--muted);font-size:1rem;margin-bottom:1.25rem}
.badge-row{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap}
.badge{background:rgba(59,130,246,.1);border:1px solid rgba(59,130,246,.25);color:var(--accent);padding:.25rem .75rem;border-radius:999px;font-size:.82rem}

/* MAIN GRID */
.main-grid{display:grid;grid-template-columns:1fr 340px;gap:1.5rem;padding:2rem 0}
@media(max-width:720px){.main-grid{grid-template-columns:1fr}}

/* TEXTAREA */
.editor-wrap{position:relative}
#editor{
  width:100%;min-height:320px;background:var(--surface);border:1px solid var(--border);
  color:var(--text);padding:1rem;border-radius:var(--radius);font-size:1rem;
  resize:vertical;outline:none;transition:border-color .2s;line-height:1.7;
}
#editor:focus{border-color:var(--accent)}
#editor::placeholder{color:#475569}
.editor-actions{display:flex;gap:.5rem;margin-top:.6rem;flex-wrap:wrap}
.btn{padding:.45rem 1rem;border-radius:8px;border:1px solid var(--border);background:var(--surface2);color:var(--muted);font-size:.85rem;cursor:pointer;transition:all .2s}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:#2563eb;border-color:#2563eb;color:#fff}
.btn-danger{border-color:var(--red);color:var(--red)}
.btn-danger:hover{background:rgba(239,68,68,.1)}

/* STATS PANEL */
.stats-panel{display:flex;flex-direction:column;gap:1rem}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem}
.stat-card h3{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
.stat-item{background:var(--surface2);border-radius:8px;padding:.6rem .75rem}
.stat-item .val{font-size:1.3rem;font-weight:700;color:var(--text);line-height:1.2}
.stat-item .lbl{font-size:.72rem;color:var(--muted);margin-top:.15rem}

/* READABILITY */
.readability-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem}
.readability-card h3{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}
.score-row{display:flex;align-items:center;gap:1rem;margin-bottom:.75rem}
.score-circle{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.4rem;font-weight:800;flex-shrink:0;border:3px solid}
.score-grade{font-size:.82rem;color:var(--muted)}
.score-grade strong{display:block;font-size:1rem;color:var(--text)}
.progress-list{display:flex;flex-direction:column;gap:.4rem}
.progress-row{display:flex;align-items:center;gap:.5rem;font-size:.8rem}
.progress-row .plbl{width:110px;color:var(--muted);flex-shrink:0}
.progress-bar{flex:1;height:6px;background:var(--surface2);border-radius:3px;overflow:hidden}
.progress-fill{height:100%;border-radius:3px;transition:width .5s}
.progress-row .pval{width:32px;text-align:right;font-size:.78rem;color:var(--text)}

/* KEYWORD DENSITY */
.kw-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem}
.kw-card h3{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}
.kw-list{display:flex;flex-direction:column;gap:.35rem;max-height:220px;overflow-y:auto}
.kw-item{display:flex;align-items:center;gap:.5rem;font-size:.82rem}
.kw-word{flex:1;color:var(--text);font-weight:500}
.kw-count{color:var(--muted);width:24px;text-align:right}
.kw-pct{color:var(--accent);width:36px;text-align:right;font-size:.75rem}
.kw-bar{flex:2;height:4px;background:var(--surface2);border-radius:2px;overflow:hidden}
.kw-fill{height:100%;background:var(--accent);border-radius:2px}

/* PLATFORM LIMITS */
.limits-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.25rem}
.limits-card h3{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}
.limit-item{display:flex;align-items:center;gap:.6rem;margin-bottom:.5rem;font-size:.82rem}
.limit-icon{font-size:1rem;width:20px}
.limit-name{color:var(--muted);width:100px;flex-shrink:0}
.limit-bar-wrap{flex:1;height:6px;background:var(--surface2);border-radius:3px;overflow:hidden}
.limit-bar-fill{height:100%;border-radius:3px;transition:width .4s}
.limit-count{width:60px;text-align:right;font-size:.75rem}
.limit-ok{color:var(--green)}
.limit-warn{color:var(--yellow)}
.limit-over{color:var(--red)}

/* INFO SECTION */
.info-section{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:2.5rem 0}
.info-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:1.5rem}
.info-grid h2{font-size:1rem;color:var(--accent);margin-bottom:.4rem}
.info-grid p{font-size:.88rem;color:var(--muted);line-height:1.7}

/* FAQ */
.faq-section{padding:2.5rem 0}
.faq-section h2{font-size:1.5rem;margin-bottom:1.25rem}
.faq-list{display:flex;flex-direction:column;gap:.6rem}
details{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
summary{padding:.9rem 1.1rem;cursor:pointer;font-weight:500;list-style:none;display:flex;justify-content:space-between}
summary::after{content:'+';color:var(--accent)}
details[open] summary::after{content:'−'}
details p{padding:0 1.1rem .9rem;color:var(--muted);font-size:.88rem;line-height:1.7}

footer{background:var(--surface);border-top:1px solid var(--border);padding:1.25rem 0;text-align:center;color:var(--muted);font-size:.82rem}