/* Essay Feedback AI — Landing — Minimal Professional */
:root{
  --bg:#f8fafc;--ink:#0f172a;--muted:#64748b;--muted-2:#94a3b8;
  --accent:#2563eb;--accent-soft:#eff6ff;--border:#e2e8f0;--card:#ffffff;--paper:#ffffff;
  --radius:16px;--radius-sm:12px;--radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);--shadow:0 4px 12px rgba(15,23,42,.06);--shadow-lg:0 16px 40px rgba(15,23,42,.10);
}
html[data-theme="dark"]{
  --bg:#020617;--ink:#f1f5f9;--muted:#94a3b8;--border:#1e293b;--card:#0f172a;--paper:#0f172a;
  --accent:#3b82f6;--accent-soft:#1e293b;
}
.logo-link{color:var(--ink);display:flex;align-items:center;text-decoration:none}
.logo-link svg{flex:0 0 auto}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  color:var(--ink);background:var(--bg);
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;max-width:100vw;
}
.theme-toggle{
  display:inline-flex;align-items:center;gap:10px;
  background:transparent;border:0;cursor:pointer;padding:4px 2px;font:inherit;-webkit-tap-highlight-color:transparent;
}
.tl-label{font-size:.88rem;font-weight:700;letter-spacing:-.01em;color:var(--muted-2);transition:color .22s}
.tl-label.is-active{color:var(--ink)}
.tl-track{position:relative;width:56px;height:30px;flex:0 0 auto;background:linear-gradient(180deg,#8bb0ff 0%,#6b8cff 100%);border-radius:999px;box-shadow:inset 0 1px 3px rgba(37,99,235,.25),0 1px 2px rgba(15,23,42,.08);transition:background .22s}
html[data-theme="dark"] .tl-track{background:linear-gradient(180deg,#5a7fdb 0%,#4a6bcf 100%)}
.tl-knob{position:absolute;top:3px;left:3px;width:24px;height:24px;background:#fff;border-radius:50%;box-shadow:0 2px 6px rgba(15,23,42,.18),0 1px 2px rgba(15,23,42,.12);transition:transform .32s cubic-bezier(.34,1.56,.64,1)}
html[data-theme="dark"] .tl-knob{transform:translateX(26px)}
.tl-craters{position:absolute;inset:0;pointer-events:none}
.tl-craters i{position:absolute;background:rgba(255,255,255,.95);border-radius:50%;transition:opacity .2s}
.tl-craters i:nth-child(1){width:7px;height:7px;right:10px;top:7px}
.tl-craters i:nth-child(2){width:4px;height:4px;right:20px;top:14px;opacity:.9}
html[data-theme="dark"] .tl-craters{opacity:0}
.theme-toggle:active .tl-knob{scale:.96}
.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:999px}
.top{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px max(20px,3vw);max-width:1120px;margin:0 auto;
  position:sticky;top:0;z-index:20;
  background:color-mix(in srgb,var(--bg) 86%, transparent);
  backdrop-filter:blur(14px) saturate(1.15);-webkit-backdrop-filter:blur(14px) saturate(1.15);
  border-bottom:1px solid var(--border);
}
.logo-link{display:flex;align-items:center;text-decoration:none}
.top-link{
  font-size:.92rem;color:var(--card);text-decoration:none;font-weight:750;letter-spacing:-.01em;
  padding:11px 22px;border:1px solid var(--ink);border-radius:var(--radius-pill);
  background:var(--ink);box-shadow:0 4px 14px rgba(15,23,42,.12);transition:all .18s;
}
.top-link:hover{background:var(--accent);border-color:var(--accent);transform:translateY(-1px);box-shadow:0 8px 20px rgba(37,99,235,.18);color:#fff}
html[data-theme="dark"] .top-link{color:var(--card);background:var(--ink);border-color:var(--ink)}
html[data-theme="dark"] .top-link:hover{color:#fff;background:var(--accent);border-color:var(--accent)}
.top-link:active{transform:translateY(0) scale(.98)}

/* Hero — calm, spacious, single accent */
.hero{
  display:grid;grid-template-columns:1.05fr .85fr;gap:56px;
  max-width:1120px;margin:0 auto;padding:56px max(20px,3vw) 64px;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.70rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--accent);margin-bottom:16px;
  background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 14%, transparent);
  padding:6px 10px;border-radius:var(--radius-pill);
}
.hero h1{font-size:clamp(2.4rem,4.8vw,3.4rem);line-height:.98;font-weight:800;letter-spacing:-.04em;margin-bottom:14px;text-wrap:balance}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{font-size:1.02rem;color:var(--muted);line-height:1.65;margin-bottom:24px;max-width:52ch}
.hero-cta{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;background:var(--accent);color:#fff;
  border:1px solid var(--accent);border-radius:var(--radius-pill);
  font-size:.92rem;font-weight:700;text-decoration:none;cursor:pointer;
  box-shadow:0 4px 16px color-mix(in srgb,var(--accent) 24%, transparent);
  transition:transform .18s,box-shadow .18s,background .18s;
}
.btn-primary:hover{transform:translateY(-2px);background:#1d4ed8;box-shadow:0 8px 24px color-mix(in srgb,var(--accent) 30%, transparent)}
.btn-primary:active{transform:translateY(0)}
.hero-note{font-size:.82rem;color:var(--muted)}
.error{color:var(--accent);margin-top:12px;font-size:.86rem}

/* Mock report — clean card, no rotated papers */
.hero-right{display:grid;place-items:center}
.mock-report{
  width:100%;max-width:360px;
  background:var(--card);border:1px solid var(--border);border-radius:20px;
  padding:22px;box-shadow:var(--shadow-lg);
}
.mock-header{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.mock-score-ring{width:56px;height:56px;position:relative;flex-shrink:0}
.mock-score-ring svg{width:100%;height:100%;transform:rotate(-90deg);display:block}
.mock-score-num{position:absolute;inset:0;display:grid;place-items:center;font-size:1.25rem;font-weight:800;letter-spacing:-.02em}
.mock-score-meta{display:flex;flex-direction:column;gap:2px}
.mock-score-label{font-size:.78rem;font-weight:700}
.mock-score-note{font-size:.74rem;color:var(--muted);font-weight:500}
.mock-metrics{display:flex;border:1px solid var(--border);border-radius:var(--radius-pill);overflow:hidden;background:var(--bg);margin-bottom:14px}
.mock-metric{flex:1;text-align:center;padding:10px 0}
.mock-metric:not(:last-child){border-right:1px solid var(--border)}
.mock-metric-val{display:block;font-weight:800;font-size:.98rem;letter-spacing:-.02em}
.mock-metric-label{display:block;font-size:.62rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;font-weight:700;margin-top:2px}
.mock-issues{display:flex;flex-direction:column;gap:8px}
.mock-issue{display:flex;align-items:center;gap:8px;font-size:.78rem;color:var(--muted);font-weight:500}
.mock-issue-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.mock-issue-dot.grammar{background:#0f766e}
.mock-issue-dot.clarity{background:#7c3aed}
.mock-issue-dot.structure{background:#0891b2}

/* Sections */
.how,.demo,.features,.pricing{max-width:1120px;margin:0 auto;padding:48px max(20px,3vw) 64px;border-top:1px solid var(--border)}
.section-tag{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.68rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);font-weight:700;
  background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 14%, transparent);
  padding:5px 9px;border-radius:var(--radius-pill);margin-bottom:10px;
}
.how h2,.demo h2,.features h2,.pricing h2{font-size:clamp(1.45rem,2.4vw,1.9rem);margin:0 0 24px;font-weight:800;letter-spacing:-.03em;line-height:1.1}

/* How — 3 clean cards */
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.how-step{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.how-num{
  display:grid;place-items:center;width:32px;height:32px;
  background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 14%, transparent);
  color:var(--accent);border-radius:8px;font-weight:800;font-size:.88rem;margin-bottom:12px;
}
.how-step h3{font-size:.98rem;margin-bottom:6px;letter-spacing:-.01em}
.how-step p{font-size:.88rem;color:var(--muted);line-height:1.6}

/* Demo */
.demo-wrap{display:grid;grid-template-columns:340px 1fr;gap:20px;align-items:start}
.demo-report{
  position:sticky;top:72px;background:var(--card);border:1px solid var(--border);
  border-radius:16px;padding:18px;box-shadow:var(--shadow);
}
.demo-score-row{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.demo-score-ring{width:64px;height:64px;position:relative;flex-shrink:0}
.demo-score-ring svg{width:100%;height:100%;transform:rotate(-90deg);display:block}
.demo-score-num{position:absolute;inset:0;display:grid;place-items:center;font-size:1.3rem;font-weight:800}
.demo-score-meta{display:flex;flex-direction:column;gap:2px;font-size:.84rem}
.demo-score-desc{font-size:.82rem;color:var(--muted);line-height:1.4;font-weight:500}
.demo-metrics{display:flex;border:1px solid var(--border);border-radius:var(--radius-pill);overflow:hidden;background:var(--bg);margin-bottom:12px}
.demo-metric{flex:1;text-align:center;padding:8px 0;font-size:.82rem}
.demo-metric:not(:last-child){border-right:1px solid var(--border)}
.demo-metric strong{display:block;font-weight:800}
.demo-metric small{display:block;font-size:.68rem;color:var(--muted);letter-spacing:.04em;text-transform:uppercase;font-weight:700}
.demo-issues-list{display:flex;flex-direction:column;gap:6px}
.demo-issue-row{display:flex;align-items:center;gap:8px;font-size:.76rem;color:var(--muted)}
.demo-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.demo-dot.grammar{background:#0f766e}.demo-dot.clarity{background:#7c3aed}.demo-dot.structure{background:#0891b2}.demo-dot.argument{background:#2563eb}
.demo-essay{min-width:0;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:22px}
.demo-essay-title{font-size:1.1rem;font-weight:750;letter-spacing:-.02em;margin:0 0 12px}
.demo-essay-text{font-size:.92rem;color:var(--ink);line-height:1.7;margin-bottom:12px}
.annotated-mark{border-radius:6px;padding:1px 4px;position:relative;border-bottom:2px solid transparent}
.annotated-mark.grammar{background:color-mix(in srgb,#0f766e 10%, transparent);border-bottom-color:color-mix(in srgb,#0f766e 24%, transparent)}
.annotated-mark.clarity{background:color-mix(in srgb,#7c3aed 10%, transparent);border-bottom-color:color-mix(in srgb,#7c3aed 24%, transparent)}
.annotated-mark::after{
  content:attr(data-num);position:absolute;top:-8px;right:-6px;
  font-size:.6rem;font-weight:800;line-height:1;color:#fff;
  width:15px;height:15px;border-radius:50%;display:grid;place-items:center;
}
.annotated-mark.grammar::after{background:#0f766e}.annotated-mark.clarity::after{background:#7c3aed}
.demo-annotations{margin-top:18px;border-top:1px solid var(--border)}
.demo-anno-row{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:12px 0;border-bottom:1px solid var(--border);font-size:.86rem;color:var(--muted);line-height:1.6}
.demo-anno-num{width:26px;height:26px;border-radius:50%;background:var(--ink);color:var(--card);display:grid;place-items:center;font-size:.72rem;font-weight:800}
.demo-anno-row strong{color:var(--ink)}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.feature-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.feature-item strong{display:block;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);font-weight:750;margin-bottom:6px}
.feature-item p{font-size:.88rem;color:var(--muted);line-height:1.6}

/* Pricing */
.pricing-grid{display:grid;grid-template-columns:1fr;max-width:520px}
.price-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px;display:flex;flex-direction:column}
.price-name{font-size:.70rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:8px}
.price-amount{font-size:2.4rem;font-weight:800;letter-spacing:-.04em;line-height:1}
.price-period{font-size:.82rem;color:var(--muted);margin:4px 0 18px}
.price-features{list-style:none;padding:0;margin:0 0 20px;flex:1}
.price-features li{font-size:.88rem;padding:9px 0;border-bottom:1px solid var(--border);color:var(--ink);display:flex;gap:8px;align-items:center}
.price-features li::before{content:"✓";display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--accent-soft);color:var(--accent);font-size:.68rem;font-weight:800;flex:0 0 auto}
.price-features li:last-child{border-bottom:0}
.btn-dark{
  display:inline-flex;justify-content:center;align-items:center;
  padding:12px 18px;background:var(--ink);color:var(--card);border:1px solid var(--ink);
  border-radius:var(--radius-pill);font-size:.88rem;font-weight:700;text-decoration:none;cursor:pointer;
  transition:all .18s;
}
.btn-dark:hover{opacity:.92;transform:translateY(-1px)}

/* Footer */
.foot{
  max-width:1120px;margin:0 auto;padding:20px max(16px,3vw);
  border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;
  font-size:.82rem;
}
.foot-links{display:flex;gap:18px}
.foot-links a{color:var(--muted);text-decoration:none;font-weight:500}
.foot-links a:hover{color:var(--ink)}
.foot-copy{color:var(--muted-2)}

/* Responsive */
@media (max-width:960px){
  .hero{grid-template-columns:1fr;gap:28px;padding-top:28px}
  .how-grid{grid-template-columns:1fr 1fr}
  .demo-wrap{grid-template-columns:1fr}
  .demo-report{position:relative;top:auto}
}
@media (max-width:640px){
  .top{padding:12px 14px;gap:10px}
  .top .theme-toggle{gap:6px}
  .top .tl-label{font-size:.76rem}
  .top .tl-track{width:44px;height:24px}
  .top .tl-knob{width:18px;height:18px;top:3px;left:3px}
  html[data-theme="dark"] .top .tl-knob{transform:translateX(20px)}
  .top .tl-craters i:nth-child(1){width:4.5px;height:4.5px;right:7px;top:5px}
  .top .tl-craters i:nth-child(2){width:3px;height:3px;right:14px;top:10px}
  .hero{padding:24px 14px 32px}
  .hero h1{font-size:clamp(2rem,8vw,2.6rem)}
  .how,.demo,.features,.pricing{padding:28px 14px 44px}
  .how-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .foot{flex-direction:column;gap:10px;padding:16px 14px}
}