:root {
  --ink: #0f172a;          /* slate-900 */
  --muted: #64748b;        /* slate-500 */
  --line: #e2e8f0;         /* slate-200 */
  --pink-600: #db2777;
  --pink-500: #ec4899;
  --rose-500: #f43f5e;
  --grad: linear-gradient(to right, var(--pink-600), var(--pink-500), var(--rose-500));
  --ok-bg: #ecfdf5;  --ok-line: #10b981;  --ok-ink: #047857;
  --bad-bg: #fef2f2; --bad-line: #ef4444; --bad-ink: #b91c1c;
  --warn-bg: #fffbeb; --warn-line: #f59e0b; --warn-ink: #b45309;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 60% 45% at 50% 38%, rgba(244, 114, 182, .22), transparent 70%),
    #fff;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar {
  padding: 16px 24px;
  background: rgba(255, 255, 255, .9);
  border-bottom: 1px solid #f1f5f9;
}
.logo { font-weight: 900; font-size: 20px; letter-spacing: -.02em; }
.logo span { color: var(--pink-600); }

.hero {
  max-width: 480px;
  margin: 0 auto;
  padding: 40px 16px 64px;
  text-align: center;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2.25rem, 9vw, 3.5rem);
  line-height: 1;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -.02em;
}
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub { margin: 0 0 28px; color: var(--muted); font-size: 1.05rem; }

.card {
  text-align: left;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 20px 25px -5px rgba(15, 23, 42, .06), 0 8px 10px -6px rgba(15, 23, 42, .06);
}

.field { margin-bottom: 18px; }
label { display: block; margin-bottom: 6px; font-size: .8rem; font-weight: 700;
        text-transform: uppercase; letter-spacing: .05em; color: #334155; }

input {
  width: 100%;
  padding: 14px 16px;
  font: inherit;
  font-size: 1.1rem;
  color: var(--ink);
  background: #fff;
  border: 2px solid var(--line);
  border-radius: 16px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input::placeholder { color: #94a3b8; }
input:focus { border-color: var(--pink-500); box-shadow: 0 0 0 4px rgba(236, 72, 153, .18); }
input[aria-invalid="true"] { border-color: var(--bad-line); box-shadow: 0 0 0 4px rgba(239, 68, 68, .12); }

.opt { font-weight: 500; text-transform: none; letter-spacing: 0; color: var(--muted); }

.err { min-height: 1.1em; margin: 6px 2px 0; font-size: .85rem; color: var(--bad-ink); }

.btn {
  width: 100%;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px;
  font: inherit; font-size: 1.05rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .05em;
  color: #fff;
  background: var(--grad);
  border: 1px solid rgba(236, 72, 153, .2);
  border-radius: 16px;
  cursor: pointer;
  box-shadow: 0 20px 25px -5px rgba(236, 72, 153, .35), 0 8px 10px -6px rgba(236, 72, 153, .35);
  transition: transform .1s, filter .15s;
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: scale(.98); }
.btn:disabled { cursor: progress; filter: grayscale(.2) brightness(.95); }
.btn:focus-visible { outline: 3px solid #fbcfe8; outline-offset: 3px; }

.spinner {
  display: none; width: 18px; height: 18px;
  border: 3px solid rgba(255, 255, 255, .5); border-top-color: #fff;
  border-radius: 50%; animation: spin .8s linear infinite;
}
.btn:disabled .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.result {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 16px;
  border: 2px solid;
  font-weight: 700;
  line-height: 1.35;
  animation: pop .2s ease-out;
}
.result small { display: block; margin-top: 4px; font-weight: 500; opacity: .85; }
.result.ok   { background: var(--ok-bg);   border-color: var(--ok-line);   color: var(--ok-ink); }
.result.bad  { background: var(--bad-bg);  border-color: var(--bad-line);  color: var(--bad-ink); }
.result.warn { background: var(--warn-bg); border-color: var(--warn-line); color: var(--warn-ink); }
@keyframes pop { from { opacity: 0; transform: translateY(4px) scale(.98); } }

@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }