:root {
  --app-bg: #070b14;
  --app-panel: rgba(15, 23, 42, 0.78);
  --app-panel-strong: #0f172a;
  --app-text: #f1f5f9;
  --app-body: #cbd5e1;
  --app-muted: #94a3b8;
  --app-gold: #CA9F49;
  --app-gold-bright: #D3AF68;
  --app-blue: #3b82f6;
  --app-cyan: #06b6d4;
  --app-border: rgba(202, 159, 73, 0.18);
  --app-border-strong: rgba(202, 159, 73, 0.38);
  --app-shadow: 0 20px 60px rgba(0, 0, 0, 0.34);
}

[data-theme="light"] {
  --app-bg: #faf8f5;
  --app-panel: rgba(255, 255, 255, 0.86);
  --app-panel-strong: #ffffff;
  --app-text: #0f172a;
  --app-body: #334155;
  --app-muted: #64748b;
  --app-gold: #b48a1a;
  --app-gold-bright: #d4a832;
  --app-blue: #2563eb;
  --app-cyan: #0891b2;
  --app-border: rgba(15, 23, 42, 0.08);
  --app-border-strong: rgba(180, 138, 26, 0.35);
  --app-shadow: 0 18px 42px rgba(180, 138, 26, 0.12), 0 1px 3px rgba(15, 23, 42, 0.05);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--app-bg); overflow-x: clip; }
body.proof-app {
  min-height: 100vh;
  margin: 0;
  color: var(--app-body);
  background:
    radial-gradient(44rem 30rem at 78% 10%, rgba(202, 159, 73, 0.13), transparent 68%),
    radial-gradient(36rem 26rem at 8% 20%, rgba(59, 130, 246, 0.14), transparent 70%),
    var(--app-bg);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: clip;
}
@supports not (overflow: clip) {
  html, body.proof-app { overflow-x: hidden; }
}

[data-theme="light"] body.proof-app {
  background:
    radial-gradient(42rem 28rem at 78% 8%, rgba(180, 138, 26, 0.10), transparent 68%),
    linear-gradient(180deg, #faf8f5 0%, #f5f1e8 100%);
}

.app-shell { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; }
.app-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px) saturate(1.25);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid var(--app-border);
}
[data-theme="light"] .app-nav { background: rgba(250, 248, 245, 0.82); }
.app-nav__inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.app-logo { display: inline-flex; align-items: center; gap: 0.65rem; color: var(--app-text); text-decoration: none; font-weight: 800; }
.app-mark {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  color: #070b14;
  background: linear-gradient(135deg, var(--app-gold), var(--app-gold-bright));
  font-weight: 900;
}
.app-nav__links { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }
.app-nav__links a, .theme-mini {
  color: var(--app-body);
  border: 1px solid var(--app-border);
  background: var(--app-panel);
  padding: 0.48rem 0.78rem;
  border-radius: 8px;
  text-decoration: none;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  cursor: pointer;
}
.app-nav__links a:hover, .theme-mini:hover { color: var(--app-gold); border-color: var(--app-border-strong); }

.app-hero { padding: clamp(3.5rem, 8vw, 6.4rem) 0 2rem; }
.app-kicker {
  color: var(--app-gold);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.app-hero h1 {
  max-width: 860px;
  margin: 0;
  color: var(--app-text);
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: 0;
}
.app-hero h1 span {
  color: var(--app-gold);
  font-style: normal;
}
.app-lead { max-width: 720px; margin: 1.15rem 0 0; font-size: 1.08rem; color: var(--app-body); }

.app-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr); gap: clamp(1rem, 4vw, 2rem); align-items: start; padding: 2rem 0 4rem; }
.app-card {
  background: var(--app-panel);
  border: 1px solid var(--app-border);
  border-radius: 8px;
  box-shadow: var(--app-shadow);
  backdrop-filter: blur(14px);
}
.app-card__head { padding: 1.2rem 1.35rem; border-bottom: 1px solid var(--app-border); }
.app-card__head h2, .app-output h2 { margin: 0; color: var(--app-text); font-size: 1.1rem; }
.app-card__head p { margin: 0.35rem 0 0; color: var(--app-muted); font-size: 0.9rem; }
.app-form { display: grid; gap: 1rem; padding: 1.35rem; }
.field { display: grid; gap: 0.42rem; }
.field label { color: var(--app-text); font-size: 0.82rem; font-weight: 800; }
.field input:not([type="checkbox"]):not([type="radio"]), .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--app-border);
  border-radius: 9px;
  background: var(--app-panel-strong);
  color: var(--app-text);
  padding: 0.78rem 0.85rem;
  font: inherit;
}
.check-grid input[type="checkbox"], .check-grid input[type="radio"] {
  width: 16px;
  height: 16px;
  flex: none;
  accent-color: var(--app-gold);
  cursor: pointer;
}
.field textarea { min-height: 118px; resize: vertical; }
.field small { color: var(--app-muted); }
.check-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem; }
.check-grid label {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  color: var(--app-body);
  border: 1px solid var(--app-border);
  background: rgba(255, 255, 255, 0.025);
  padding: 0.58rem;
  border-radius: 8px;
  font-size: 0.88rem;
}
[data-theme="light"] .check-grid label { background: rgba(255, 255, 255, 0.66); }
.app-button {
  border: 0;
  border-radius: 8px;
  color: #070b14;
  background: linear-gradient(135deg, var(--app-gold), var(--app-gold-bright));
  padding: 0.88rem 1.1rem;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(202, 159, 73, 0.22);
}
.app-button:hover { transform: translateY(-1px); }

.app-output { padding: 1.35rem; min-height: 520px; }
.score-band {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  padding: 1rem;
  border: 1px solid var(--app-border-strong);
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(202, 159, 73, 0.12), rgba(255, 255, 255, 0.03));
  margin-bottom: 1rem;
}
.score {
  color: var(--app-gold);
  font-size: 2.6rem;
  line-height: 1;
  font-weight: 900;
  text-align: center;
}
.score-band strong { color: var(--app-text); display: block; margin-bottom: 0.25rem; }
.output-section {
  border: 1px solid var(--app-border);
  background: rgba(255, 255, 255, 0.025);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 0.9rem;
}
[data-theme="light"] .output-section { background: rgba(255, 255, 255, 0.72); }
.output-section h3 { margin: 0 0 0.55rem; color: var(--app-text); font-size: 0.98rem; }
.output-section ul { margin: 0; padding-left: 1.15rem; }
.output-section li { margin: 0.35rem 0; }
.app-proof-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin-top: 1rem; }
.app-proof-strip div {
  border: 1px solid var(--app-border);
  border-radius: 10px;
  padding: 0.85rem;
  background: var(--app-panel);
}
.app-proof-strip strong { display: block; color: var(--app-gold); font-size: 1.2rem; }
.app-proof-strip span { color: var(--app-muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 800; }

.app-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--app-border);
}
.app-action {
  border: 1px solid var(--app-border-strong);
  background: rgba(202, 159, 73, 0.10);
  color: var(--app-gold);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  transition: background 150ms ease, transform 150ms ease;
}
.app-action:hover { background: rgba(202, 159, 73, 0.18); transform: translateY(-1px); }
.app-action:focus-visible { outline: 2px solid var(--app-gold); outline-offset: 2px; }
.app-actions__hint {
  font-size: 0.78rem;
  color: var(--app-muted);
  margin-left: auto;
  font-weight: 600;
}
[data-theme="light"] .app-action { background: rgba(180, 138, 26, 0.10); color: var(--app-gold); }
[data-theme="light"] .app-action:hover { background: rgba(180, 138, 26, 0.18); }

@media (max-width: 900px) {
  .app-grid { grid-template-columns: 1fr; }
  .app-nav__inner { align-items: flex-start; flex-direction: column; padding: 0.85rem 0; }
}

@media (max-width: 560px) {
  .check-grid, .app-proof-strip, .score-band { grid-template-columns: 1fr; }
  .score { text-align: left; }
}