:root {
    --app-bg: linear-gradient(135deg, #f4efe6 0%, #eef6ff 100%);
    --card-bg: rgba(255, 255, 255, 0.92);
    --ink: #1e2430;
    --muted: #667085;
    --accent: #0f766e;
    --accent-dark: #115e59;
}

body.app-shell {
    min-height: 100vh;
    background: var(--app-bg);
    color: var(--ink);
}

.hero-card,
.card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border-radius: 1.25rem;
}

.hero-card {
    max-width: 760px;
    padding: 3rem;
    box-shadow: 0 1rem 3rem rgba(15, 23, 42, 0.08);
}

.eyebrow {
    font-size: 0.8rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 700;
}

.btn-primary {
    background-color: var(--accent);
    border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--accent-dark);
    border-color: var(--accent-dark);
}

.secret-box {
    border: 1px dashed rgba(15, 118, 110, 0.35);
    background: #f8fffd;
    border-radius: 1rem;
    padding: 1rem;
    font-family: Consolas, "Courier New", monospace;
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 1rem;
}