:root {
  --fundo: #0d1117;
  --painel: #161b22;
  --borda: #30363d;
  --texto: #e6edf3;
  --texto-suave: #8b949e;
  --azul: #2f81f7;
  --azul-claro: #58a6ff;
  --erro: #f85149;
  --ok: #3fb950;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 0%, rgba(47, 129, 247, 0.12), transparent 40%),
    radial-gradient(circle at 80% 100%, rgba(63, 185, 80, 0.08), transparent 40%),
    var(--fundo);
  color: var(--texto);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  animation: entrar 0.6s ease both;
}

header { text-align: center; }

h1 {
  margin: 0 0 0.5rem;
  font-family: Georgia, serif;
  font-size: clamp(2rem, 6vw, 2.8rem);
  background: linear-gradient(90deg, var(--texto), var(--azul-claro), var(--ok));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: brilho 6s linear infinite;
}

header p {
  margin: 0;
  color: var(--texto-suave);
}

#login { min-height: 44px; }

#status {
  margin: 0;
  min-height: 1.4em;
  color: var(--ok);
  font-size: 0.95rem;
}

#status:not(:empty)::before { content: "✓ "; }

form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--painel);
  border: 1px solid var(--borda);
  border-radius: 14px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

form:hover,
form:focus-within {
  border-color: var(--azul);
  box-shadow: 0 0 0 4px rgba(47, 129, 247, 0.12), 0 12px 30px rgba(0, 0, 0, 0.35);
  transform: translateY(-2px);
}

label {
  font-size: 0.9rem;
  color: var(--texto-suave);
}

input {
  width: 100%;
  padding: 0.75rem 0.9rem;
  background: var(--fundo);
  color: var(--texto);
  border: 1px solid var(--borda);
  border-radius: 8px;
  font-size: 1.1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input::placeholder { color: #484f58; }

input:hover { border-color: var(--texto-suave); }

input:focus {
  outline: none;
  border-color: var(--azul-claro);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.25);
}

button {
  padding: 0.75rem 1.25rem;
  background: var(--azul);
  color: #fff;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

button:hover {
  background: var(--azul-claro);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(47, 129, 247, 0.35);
}

button:active { transform: translateY(0) scale(0.98); }

button:focus-visible {
  outline: 2px solid var(--azul-claro);
  outline-offset: 3px;
}

button[hidden] { display: none; }

#baixar {
  background: transparent;
  border-color: var(--borda);
  color: var(--texto);
  animation: entrar 0.4s ease both;
}

#baixar:hover {
  border-color: var(--ok);
  background: rgba(63, 185, 80, 0.12);
  box-shadow: none;
}

#mensagem {
  margin: 0;
  width: 100%;
  text-align: center;
  color: var(--erro);
}

#mensagem:not(:empty) {
  padding: 0.75rem 1rem;
  background: rgba(248, 81, 73, 0.1);
  border: 1px solid rgba(248, 81, 73, 0.4);
  border-radius: 8px;
  animation: tremer 0.4s ease;
}

figure {
  margin: 0;
  width: 100%;
  display: flex;
  justify-content: center;
}

figure svg {
  display: block;
  width: 100%;
  max-width: 560px;
  height: auto;
  border: 1px solid var(--borda);
  border-radius: 14px;
  animation: aparecer 0.7s ease both;
  transition: transform 0.3s, box-shadow 0.3s;
}

figure svg:hover {
  transform: scale(1.02);
  box-shadow: 0 16px 40px rgba(47, 129, 247, 0.2);
}

@keyframes entrar {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes aparecer {
  from { opacity: 0; transform: scale(0.92) rotate(-2deg); }
  to   { opacity: 1; transform: scale(1) rotate(0); }
}

@keyframes tremer {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes brilho {
  to { background-position: 200% center; }
}

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