/* readabilitycheck.com — Console (dark, Linear/Vercel lane) */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  /* Dark (default) */
  --bg:#0a0a0a;
  --surface:#0f0f10;
  --surface-2:#161618;
  --border:#1f1f23;
  --border-hover:#2d2d34;
  --fg:#fafafa;
  --fg-2:#e4e4e7;
  --muted:#a1a1aa;
  --subtle:#71717a;
  --faint:#52525b;
  --accent:#00d97e;
  --accent-strong:#00d97e;
  --accent-dim:rgba(0,217,126,.12);
  --accent-soft:rgba(0,217,126,.04);

  --green:#22c55e;--green-bg:rgba(34,197,94,.12);--green-border:rgba(34,197,94,.32);
  --amber:#eab308;--amber-bg:rgba(234,179,8,.12);--amber-border:rgba(234,179,8,.32);
  --red:#ef4444;--red-bg:rgba(239,68,68,.12);--red-border:rgba(239,68,68,.36);
  --hover-green:rgba(34,197,94,.22);
  --hover-amber:rgba(234,179,8,.22);
  --hover-red:rgba(239,68,68,.22);

  --sans:'Geist',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --mono:'Geist Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --radius:10px;
}

[data-theme="light"]{
  --bg:#fafafa;
  --surface:#ffffff;
  --surface-2:#f4f4f5;
  --border:#e4e4e7;
  --border-hover:#d4d4d8;
  --fg:#09090b;
  --fg-2:#18181b;
  --muted:#52525b;
  --subtle:#71717a;
  --faint:#a1a1aa;
  --accent:#059669;
  --accent-strong:#047857;
  --accent-dim:rgba(5,150,105,.14);
  --accent-soft:rgba(5,150,105,.06);

  --green:#15803d;--green-bg:rgba(34,197,94,.14);--green-border:rgba(34,197,94,.34);
  --amber:#a16207;--amber-bg:rgba(234,179,8,.18);--amber-border:rgba(234,179,8,.36);
  --red:#b91c1c;--red-bg:rgba(239,68,68,.12);--red-border:rgba(239,68,68,.34);
  --hover-green:rgba(34,197,94,.26);
  --hover-amber:rgba(234,179,8,.32);
  --hover-red:rgba(239,68,68,.22);
}

html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--fg-2);
  line-height:1.55;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
  letter-spacing:-0.005em;
}

.wrap{max-width:1200px;margin:0 auto;padding:1rem 1.25rem 4rem}

/* ─── Top bar ───────────────────────────────────────── */
.topbar{
  display:flex;justify-content:space-between;align-items:center;
  padding:.875rem 0;margin-bottom:1.75rem;
  border-bottom:1px solid var(--border);
}
.brand{
  display:inline-flex;align-items:center;gap:.625rem;
  color:var(--fg);text-decoration:none;font-weight:600;font-size:.9375rem;letter-spacing:-0.01em;
}
.brand-mark{
  width:22px;height:22px;border-radius:6px;
  background:var(--accent);color:#0a0a0a;
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-weight:700;font-size:.75rem;
}
.brand-accent{color:var(--accent);font-weight:600}
.brand .ver{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
  background:var(--surface);border:1px solid var(--border);
  padding:2px 6px;border-radius:4px;margin-left:.375rem;font-weight:500;
}
.topbar-right{display:flex;align-items:center;gap:1.25rem}
.topbar-right a{color:var(--muted);text-decoration:none;font-size:.8125rem;transition:color .15s}
.topbar-right a:hover{color:var(--fg)}
.kbd{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
  border:1px solid var(--border);background:var(--surface);
  padding:2px 6px;border-radius:4px;
}
.theme-toggle{
  background:var(--surface);border:1px solid var(--border);border-radius:6px;
  width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;
  color:var(--muted);cursor:pointer;transition:color .15s,border-color .15s,background .15s;padding:0;
}
.theme-toggle:hover{color:var(--fg);border-color:var(--border-hover);background:var(--surface-2)}
.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.theme-toggle .icon-sun{display:none}
.theme-toggle .icon-moon{display:block}
[data-theme="light"] .theme-toggle .icon-sun{display:block}
[data-theme="light"] .theme-toggle .icon-moon{display:none}

/* ─── Hero strip ───────────────────────────────────── */
.hero{margin-bottom:1.5rem}
.hero h1{
  font-size:clamp(1.625rem,3vw,2.125rem);font-weight:600;letter-spacing:-0.022em;
  color:var(--fg);margin-bottom:.5rem;line-height:1.15;
}
.hero p{color:var(--muted);font-size:.9375rem;max-width:62ch;margin-bottom:.875rem}
.try-sample{
  background:transparent;border:0;padding:0;font:inherit;font-family:var(--mono);
  font-size:.75rem;color:var(--accent);cursor:pointer;letter-spacing:-0.005em;
  display:inline-flex;align-items:center;gap:.375rem;
}
.try-sample::after{content:"→";transition:transform .2s}
.try-sample:hover::after{transform:translateX(3px)}
.try-sample:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}

/* ─── Composer panel ────────────────────────────────── */
.panel{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:1rem;
}
.panel-head{
  display:flex;justify-content:space-between;align-items:center;
  padding:.625rem .875rem;border-bottom:1px solid var(--border);min-height:42px;
}
.panel-head .title{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
  text-transform:uppercase;letter-spacing:.08em;font-weight:500;
}
.panel-head .meta{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
}

.mode{display:inline-flex;gap:0;background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:2px}
.mode button{
  background:transparent;border:0;font:inherit;font-family:var(--mono);font-size:.6875rem;
  color:var(--subtle);cursor:pointer;padding:.45rem .7rem;border-radius:4px;min-height:34px;
  text-transform:uppercase;letter-spacing:.06em;transition:all .15s;
  display:inline-flex;align-items:center;gap:.375rem;
}
.mode button[aria-pressed="true"]{background:var(--surface-2);color:var(--fg)}
.mode button[disabled]{cursor:not-allowed;color:var(--faint)}
.mode .pill{
  font-size:.5625rem;color:var(--accent);font-weight:600;
  border:1px solid var(--accent-dim);background:var(--accent-soft);
  padding:1px 5px;border-radius:3px;
}

#text-input{
  width:100%;min-height:200px;padding:1rem 1.125rem;
  font-family:var(--sans);font-size:.9375rem;line-height:1.65;color:var(--fg);
  background:transparent;border:0;resize:vertical;outline:none;
}
#text-input::placeholder{color:var(--faint)}

.composer-foot{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.625rem;
  padding:.625rem .875rem;border-top:1px solid var(--border);
}
#counter{font-family:var(--mono);font-size:.75rem;color:var(--muted);font-variant-numeric:tabular-nums}
.actions{display:flex;gap:.375rem}
.actions button{
  background:var(--bg);border:1px solid var(--border);
  font:inherit;font-family:var(--mono);font-size:.6875rem;color:var(--muted);
  cursor:pointer;padding:.625rem 1rem;border-radius:5px;min-height:44px;
  text-transform:uppercase;letter-spacing:.06em;transition:all .15s;
}
.actions button:hover{color:var(--fg);border-color:var(--border-hover);background:var(--surface-2)}
.actions button:focus-visible,.mode button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ─── Verdict + scoreboard ─────────────────────────── */
.row-2col{display:grid;grid-template-columns:1fr;gap:1rem;margin-bottom:1rem}
@media(min-width:880px){.row-2col{grid-template-columns:5fr 9fr;gap:1rem}}

.verdict-panel{padding:1.25rem 1.5rem;display:flex;flex-direction:column;justify-content:space-between;min-height:240px}
.verdict-helper{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
  margin-top:.5rem;letter-spacing:-0.005em;
}
.verdict-label{font-family:var(--mono);font-size:.6875rem;color:var(--subtle);text-transform:uppercase;letter-spacing:.08em;margin-bottom:.25rem}
.verdict-grade{
  font-family:var(--mono);font-size:clamp(3.5rem,8vw,5rem);font-weight:600;line-height:1;
  color:var(--fg);font-variant-numeric:tabular-nums;letter-spacing:-0.04em;
  margin:.5rem 0 .375rem;
}
.verdict-grade.empty{color:var(--faint);font-weight:400;font-size:clamp(2.75rem,6vw,3.75rem)}
.verdict-band{font-family:var(--mono);font-size:.875rem;color:var(--accent);text-transform:uppercase;letter-spacing:.04em}
.verdict-band.empty{color:var(--faint)}
.verdict-bar{margin-top:1.25rem}
.verdict-bar-track{height:4px;background:var(--bg);border-radius:2px;position:relative;overflow:hidden}
.verdict-bar-fill{height:100%;background:linear-gradient(90deg,var(--green),var(--amber) 55%,var(--red));width:0%;transition:width .3s ease-out}
.verdict-bar-marker{position:absolute;top:-3px;width:2px;height:10px;background:var(--fg);border-radius:1px;transform:translateX(-1px);transition:left .3s ease-out}
.verdict-bar-scale{display:flex;justify-content:space-between;font-family:var(--mono);font-size:.625rem;color:var(--faint);margin-top:.5rem;letter-spacing:.04em}

.scoreboard{padding:.25rem 0}
.score-row{
  display:grid;grid-template-columns:auto 1fr auto;gap:.875rem;align-items:center;
  padding:.875rem 1.25rem;border-bottom:1px solid var(--border);
}
.score-row:last-child{border-bottom:0}
.score-row .name{
  font-family:var(--mono);font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;
  display:inline-flex;align-items:center;gap:.5rem;
}
.score-row .info{
  display:inline-block;width:13px;height:13px;line-height:11px;text-align:center;
  font-size:.625rem;color:var(--subtle);border:1px solid var(--border);border-radius:50%;
  cursor:help;font-family:var(--sans);font-weight:500;
}
.score-row .lvl-label{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);text-align:right;letter-spacing:.02em;
}
.score-row .value{
  font-family:var(--mono);font-weight:600;font-size:1.25rem;color:var(--fg);
  font-variant-numeric:tabular-nums;letter-spacing:-0.02em;text-align:right;min-width:3.5rem;
}
.score-row[data-level="green"] .value{color:var(--green)}
.score-row[data-level="amber"] .value{color:var(--amber)}
.score-row[data-level="red"] .value{color:var(--red)}
.score-row[data-level="none"] .value{color:var(--faint);font-weight:400}
.score-row[data-level="none"] .lvl-label{color:var(--faint)}

/* ─── Annotated text panel ─────────────────────────── */
.panel-body{padding:1.25rem 1.5rem}
#summary{font-family:var(--mono);font-size:.75rem;color:var(--muted);margin-bottom:1rem;letter-spacing:-0.005em}
#summary:empty{display:none}
#highlight{
  font-size:.9375rem;line-height:1.85;color:var(--fg-2);
}
#highlight .empty{color:var(--faint);font-style:italic;font-size:.875rem}
.sent{padding:2px 4px;margin:0 -1px;border-radius:3px;transition:all .15s;
  box-decoration-break:clone;-webkit-box-decoration-break:clone}
.sent[data-level="green"]{background:var(--green-bg)}
.sent[data-level="amber"]{background:var(--amber-bg)}
.sent[data-level="red"]{background:var(--red-bg)}
.sent[data-level="green"]:hover{background:var(--hover-green)}
.sent[data-level="amber"]:hover{background:var(--hover-amber)}
.sent[data-level="red"]:hover{background:var(--hover-red)}
.cx{text-decoration:underline wavy var(--amber);text-decoration-thickness:1.5px;text-underline-offset:5px;cursor:help;text-decoration-skip-ink:none}

/* ─── Tips panel ───────────────────────────────────── */
#tips{list-style:none;padding:0;margin:0;display:flex;flex-direction:column}
#tips:empty{display:none}
#tips li{
  font-size:.9375rem;line-height:1.55;color:var(--fg-2);
  padding:.875rem 1.5rem .875rem 2.75rem;border-bottom:1px solid var(--border);
  position:relative;
}
#tips li:last-child{border-bottom:0}
#tips li::before{
  content:"";position:absolute;left:1.5rem;top:1.25rem;
  width:6px;height:6px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 8px var(--accent-dim);
}

/* ─── Footer ───────────────────────────────────────── */
.foot{
  margin-top:2rem;padding-top:1.25rem;border-top:1px solid var(--border);
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.75rem;
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);letter-spacing:-0.005em;
}
.foot a{color:var(--subtle);text-decoration:none;transition:color .15s}
.foot a:hover{color:var(--fg-2)}
.foot .right{display:flex;gap:1.25rem}
.foot .status{display:inline-flex;align-items:center;gap:.5rem}
.foot .status::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 6px var(--accent-dim);display:inline-block;animation:pulse 2.5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.45}}

/* ─── Doc page ─────────────────────────────────────── */
.doc{max-width:680px;margin:0 auto;padding:1.5rem 0}
.doc h1{font-size:clamp(1.75rem,3.5vw,2.25rem);font-weight:600;letter-spacing:-0.02em;color:var(--fg);margin:.25rem 0 1rem}
.doc h2{font-size:1rem;font-weight:600;color:var(--fg);margin:1.75rem 0 .5rem}
.doc p,.doc li{color:var(--muted);font-size:.9375rem;line-height:1.7;margin-bottom:.75rem}
.doc ul{padding-left:1.25rem;margin-bottom:.75rem}
.doc strong{color:var(--fg)}
.doc a{color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent-dim)}
.doc a:hover{border-bottom-color:var(--accent)}
.doc .updated{font-family:var(--mono);font-size:.6875rem;color:var(--subtle);text-transform:uppercase;letter-spacing:.08em;margin-bottom:1.5rem}

.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ─── Formula landing pages ───────────────────────── */
.lp{max-width:760px;margin:0 auto;padding:.75rem 0 0}
.lp .kicker{
  font-family:var(--mono);font-size:.6875rem;color:var(--accent);
  text-transform:uppercase;letter-spacing:.14em;margin-bottom:.5rem;font-weight:600;
}
.lp h1{
  font-size:clamp(1.875rem,4.5vw,2.625rem);font-weight:600;letter-spacing:-0.025em;
  color:var(--fg);line-height:1.1;margin-bottom:1rem;
}
.lp .lede{
  font-size:1.0625rem;color:var(--muted);line-height:1.6;margin-bottom:1.5rem;max-width:62ch;
}
.lp .cta-bar{
  display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;
  padding:.875rem 1.125rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:2.5rem;
}
.lp .cta-bar .label{font-family:var(--mono);font-size:.6875rem;color:var(--subtle);text-transform:uppercase;letter-spacing:.06em;flex:1}
.lp .cta-bar a{
  font-family:var(--mono);font-size:.6875rem;text-transform:uppercase;letter-spacing:.06em;
  padding:.625rem 1rem;min-height:44px;display:inline-flex;align-items:center;
  background:var(--accent-soft);border:1px solid var(--accent-dim);border-radius:5px;
  color:var(--accent);text-decoration:none;transition:background .15s;
}
.lp .cta-bar a:hover{background:var(--accent-dim)}

.lp h2{
  font-size:1.375rem;font-weight:600;color:var(--fg);letter-spacing:-0.015em;
  margin:2.25rem 0 .75rem;padding-top:1.75rem;border-top:1px solid var(--border);
}
.lp h2:first-of-type{padding-top:0;border-top:0;margin-top:1.5rem}
.lp h3{font-size:1rem;font-weight:600;color:var(--fg);margin:1.5rem 0 .5rem}
.lp p{color:var(--muted);font-size:.9375rem;line-height:1.7;margin-bottom:.875rem}
.lp ul,.lp ol{padding-left:1.25rem;margin-bottom:1rem}
.lp li{color:var(--muted);font-size:.9375rem;line-height:1.65;margin-bottom:.375rem}
.lp strong{color:var(--fg-2)}
.lp a{color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent-dim);transition:border-color .15s}
.lp a:hover{border-bottom-color:var(--accent)}

/* Inline formula box */
.formula-box{
  background:var(--surface-2);border:1px solid var(--border);border-radius:8px;
  padding:1rem 1.25rem;font-family:var(--mono);font-size:.9375rem;color:var(--fg);
  margin:1rem 0;overflow-x:auto;line-height:1.7;
}

/* Score range table */
.score-table{
  width:100%;border-collapse:collapse;margin:1rem 0 1.5rem;
  border:1px solid var(--border);border-radius:8px;overflow:hidden;
  font-size:.875rem;
}
.score-table th,.score-table td{
  padding:.625rem .875rem;text-align:left;border-bottom:1px solid var(--border);
}
.score-table th{
  background:var(--surface-2);color:var(--subtle);font-family:var(--mono);
  font-weight:500;text-transform:uppercase;letter-spacing:.06em;font-size:.6875rem;
}
.score-table tr:last-child td{border-bottom:0}
.score-table td{color:var(--muted)}
.score-table td:first-child{font-family:var(--mono);color:var(--fg);font-variant-numeric:tabular-nums}
.score-table .lvl-green{color:var(--green);font-weight:600}
.score-table .lvl-amber{color:var(--amber);font-weight:600}
.score-table .lvl-red{color:var(--red);font-weight:600}

/* FAQ */
.faq{margin:1rem 0 1.5rem;display:flex;flex-direction:column;gap:.5rem}
.faq details{
  background:var(--surface);border:1px solid var(--border);border-radius:8px;
  padding:0;overflow:hidden;
}
.faq summary{
  padding:.875rem 1.125rem;cursor:pointer;list-style:none;
  font-weight:500;color:var(--fg);font-size:.9375rem;
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
  transition:background .15s;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";font-family:var(--mono);color:var(--subtle);font-size:1.125rem;line-height:1;
  transition:transform .2s;flex-shrink:0;
}
.faq details[open] summary::after{content:"−"}
.faq summary:hover{background:var(--surface-2)}
.faq details p{
  padding:0 1.125rem 1rem;margin:0;color:var(--muted);font-size:.9375rem;line-height:1.65;
}
.faq details[open] summary{border-bottom:1px solid var(--border)}
.faq details[open] p{padding-top:.875rem}

/* Related formulas footer block */
.related{
  margin:2.5rem 0 1rem;padding-top:1.75rem;border-top:1px solid var(--border);
}
.related h3{
  font-family:var(--mono);font-size:.6875rem;color:var(--subtle);
  text-transform:uppercase;letter-spacing:.08em;font-weight:500;margin-bottom:.875rem;
}
.related-grid{display:grid;grid-template-columns:1fr;gap:.5rem}
@media(min-width:600px){.related-grid{grid-template-columns:1fr 1fr}}
.related-grid a{
  display:block;padding:.875rem 1rem;background:var(--surface);
  border:1px solid var(--border);border-radius:6px;text-decoration:none;
  transition:border-color .15s,background .15s;
}
.related-grid a:hover{border-color:var(--border-hover);background:var(--surface-2)}
.related-grid .name{color:var(--fg);font-weight:500;font-size:.9375rem;display:block;margin-bottom:.125rem}
.related-grid .blurb{color:var(--subtle);font-size:.8125rem}

/* "Learn about the formulas" block on home */
.formulas-index{margin-top:1.5rem}
.formulas-index .formulas-grid{display:grid;grid-template-columns:1fr;gap:.5rem;margin-top:.75rem}
@media(min-width:760px){.formulas-index .formulas-grid{grid-template-columns:1fr 1fr 1fr}}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}

@media(max-width:520px){
  .wrap{padding:.75rem 1rem 3rem}
  .verdict-panel{min-height:auto}
  .score-row{grid-template-columns:1fr auto;gap:.5rem}
  .score-row .lvl-label{display:none}
  .topbar-right .kbd{display:none}
}

/* Selection */
::selection{background:var(--accent);color:#0a0a0a}