/*
 * System Design Workbook — identidade visual (única e global, FR-018/FR-019)
 * Tema: dark "blueprint/engenharia" — ver specs/001-distribuicao-livro/research.md §6
 * Sem fontes/ícones de CDN externos (Princípio II) — só fontes de sistema.
 */

:root {
  --bg: #0b1f2a;
  --bg-elevated: #10293a;
  --bg-card: #0e2632;
  --border: #1f3f52;
  --text: #e7f2f6;
  --text-muted: #8fb0bd;
  --accent: #2dd4e0;
  --accent-strong: #67e8f4;
  --error: #f87171;
  --error-bg: #3a1a1a;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
}

* {
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.page {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* Hero: espaço reservado para futura capa/logo (FR-020). Por enquanto, um
   padrão "blueprint grid" simples, só CSS, sem imagem/asset externo. */
.hero-art {
  width: 100%;
  height: 96px;
  border-radius: 12px;
  background-color: var(--bg-elevated);
  background-image: linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 16px 16px;
  border: 1px solid var(--border);
}

.card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 28px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5;
}

.redeem-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.field-label {
  font-size: 12px;
  color: var(--text-muted);
}

.code-input {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 14px 12px;
  outline: none;
}

.code-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(45, 212, 224, 0.2);
}

.submit-button {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: #06222c;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  padding: 14px 16px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.submit-button:hover:not(:disabled) {
  background: var(--accent-strong);
}

.submit-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.message {
  min-height: 20px;
  margin: 16px 0 0;
  font-size: 13px;
}

.message[data-state="error"] {
  color: var(--error);
}

.message[data-state="success"] {
  color: var(--accent-strong);
}

.footer {
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}